Gas Monitor – Multi Zone
Gas Monitor – Multi Zone
Instruction 3015-5074
Installation / Operation / Maintenance
Rev. 6 –November 2010
UL 61010-1
CAN/CSA 22.2 No.61010.1
EN 14624
Product Leadership • Training • Service • Reliability
Gas Monitor – Multi Zone
WARRANTY
Bacharach, Inc. warrants to Buyer that at the time of delivery this Product will be free from defects in material and
manufacture and will conform substantially to Bacharach Inc.’s applicable specifications. Bacharach’s liability and
Buyer’s remedy under this warranty are limited to the repair or replacement, at Bacharach’s option, of this Product or
parts thereof returned to Seller at the factory of manufacture and shown to Bacharach Inc.’s reasonable satisfaction to
have been defective; provided that written notice of the defect shall have been given by Buyer to Bacharach Inc. within
two (2) years after the date of delivery of this Product by Bacharach, Inc.
Bacharach, Inc. warrants to Buyer that it will convey good title to this Product. Bacharach’s liability and Buyer’s remedy
under this warranty of title are limited to the removal of any title defects or, at the election of Bacharach, to the
replacement of this Product or parts thereof that are defective in title.
The warranty set forth in Paragraph 1 does not apply to parts the Operating Instructions designate as having a limited
shelf-life or as being expended in normal use (e.g., filters).
THE FOREGOING WARRANTIES ARE EXCLUSIVE AND ARE GIVEN AND ACCEPTED IN LIEU OF (I) ANY AND
ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE: AND (II) ANY OBLIGATION, LIABILITY, RIGHT, CLAIM OR REMEDY IN CONTRACT OR TORT, WHETHER OR NOT ARISING FROM
BACHARACH’S NEGLIGENCE, ACTUAL OR IMPLIED. The remedies of the Buyer shall be limited to those provided
herein to the exclusion of any and all other remedies including, without limitation incidental or consequential damages.
No agreement varying or extending the foregoing warranties, remedies or this limitation will be binding upon
Bacharach, Inc. unless in writing, signed by a duly authorized officer of Bacharach.
Register your warranty by visiting
www.MyBacharach.com
Declaration of Conformity
Manufacturer’s name & address:
Bacharach, Inc.
621 Hunt Valley Circle
New Kensington, PA 15068
Product Name:
HGM-MZ (Halogen Gas Monitor)
AGM-MZ (Ammonia Gas Monitor)
CE Mark:
European EMC Directive 2004/108/EC
EN55011 – Emissions Product Specific Standard
EN61326-1 – Electrical Equipment for Measurement, Control,
and Laboratory Use-Part 1
EN61010-1 – Safety requirements for Electrical Equipment
For Measurement, Control, and Laboratory
Use-Part 1: General Requirements
European Standard EN14624: 2005 testing with R-134a (Halogen Gas Monitor Only):
Min. Sensitivity Threshold
Max. Sensitivity Threshold (within 1 ppm ± 10% reading accuracy range)
Max. Sensitivity Threshold within Instrument Reading Range
Zeroing Time from 1,000 ppm*
Zeroing Time from 10,000 ppm*
Reaction Time for detection of minimum threshold*
Min. Sensitivity threshold once max. threshold has been measured
Repeatability at 500 ppm
1 ppm
1,000 ppm
10,000 ppm
<12 seconds
<25 seconds
≤12 seconds
1 ppm
± 1% of reading
* Based on a minimum tubing length of one foot
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Instruction 3015-5074
Gas Monitor – Multi Zone
Notice:
Product improvements and enhancements are continuous; therefore the specifications and information contained in
this document may change without notice.
Bacharach, Inc. shall not be liable for errors contained herein or for incidental or consequential damages in connection
with the furnishing, performance, or use of this material.
No part of this document may be photocopied, reproduced, or translated to another language without the prior written
consent of Bacharach, Inc.
Copyright © 2000–2010, Bacharach, Inc., All Rights Reserved
®
BACHARACH is a registered trademark of Bacharach, Inc. All other trademarks, trade names,
service marks and logos referenced herein belong to their respective owners.
B
Instruction 3015-5074
Gas Monitor – Multi Zone
Table of Contents
1 INTRODUCTION .......................................................................................................................................... 4
About This Manual ....................................................................................................................................... 4
Warnings and Cautions ............................................................................................................................ 4
Safety Precautions....................................................................................................................................... 5
AC Power Supply ..................................................................................................................................... 5
Protective Grounding................................................................................................................................ 5
Explosive Atmosphere.............................................................................................................................. 5
Proper Exhaust Venting ........................................................................................................................... 5
Accessing the Interior of the Monitor........................................................................................................ 5
Misuse & Modifications to the Instrument ................................................................................................ 5
In Case of Malfunction.............................................................................................................................. 5
Fusing....................................................................................................................................................... 5
Installation Category................................................................................................................................. 5
Altitude Limit............................................................................................................................................. 5
Cleaning ................................................................................................................................................... 5
Functional Overview .................................................................................................................................... 6
General Description.................................................................................................................................. 6
Communication Options ........................................................................................................................... 6
Understanding Monitoring Levels............................................................................................................. 6
Response to the Presence of Multiple Refrigerants (HGM Only) ............................................................ 6
Suggested Location of Sampling Points .................................................................................................. 6
2 INSTALLATION ........................................................................................................................................... 8
Installation Considerations........................................................................................................................... 9
Warnings & Cautions................................................................................................................................ 9
Inspection ................................................................................................................................................. 9
Location of the Monitor............................................................................................................................. 9
Mounting Instructions ............................................................................................................................. 10
Connecting Air Lines.................................................................................................................................. 11
Overview ................................................................................................................................................ 11
Tubing Considerations ........................................................................................................................... 11
Connecting Purge Line........................................................................................................................... 11
Connecting Exhaust Line ....................................................................................................................... 11
Connecting Sample Intake Lines ........................................................................................................... 12
Installing Splitter Kit................................................................................................................................ 12
Connecting Water Trap .......................................................................................................................... 12
Interior Schematics .................................................................................................................................... 13
Electrical Wiring ......................................................................................................................................... 15
Connecting Communication Devices ......................................................................................................... 16
Remote Display Module (RD) Connection ............................................................................................. 16
Integrating with Building Management Systems .................................................................................... 16
Larger Integrated Systems..................................................................................................................... 16
Changing Terminator Switch Settings.................................................................................................... 17
Personal Computer ................................................................................................................................ 17
Multiple Monitors ........................................................................................................................................ 18
Connecting to a Building Management System......................................................................................... 18
PC Software ............................................................................................................................................... 19
Saving & Sending Programs .................................................................................................................. 20
Trend Data ............................................................................................................................................. 20
Converting the TREND Text File to a Microsoft Excel File .................................................................... 20
Saving & Printing the MZ Software Screen, Alarm Log, Fault Log, or Diagnostic Screen ................... 20
USB Type Laptops ................................................................................................................................. 20
Current Loop Interfaces ............................................................................................................................. 21
Optional 4–20 mAdc Outputs ................................................................................................................. 21
Connection ............................................................................................................................................. 21
Connecting External Alarms ...................................................................................................................... 22
Overview ................................................................................................................................................ 22
Instruction 3015-5074
1
Gas Monitor – Multi Zone
Connection ............................................................................................................................................. 22
3 SETUP PROGRAMMING ...........................................................................................................................24
Display Screens ..........................................................................................................................................24
Initial Power Up ...................................................................................................................................... 24
Data Display Screen .............................................................................................................................. 24
st
Navigating to the 1 Setup Screen ........................................................................................................ 24
nd
Navigating to the 2 Setup Screen........................................................................................................ 25
Location.................................................................................................................................................. 25
Number of Zones Installed ..................................................................................................................... 25
Alarm Ack Mode..................................................................................................................................... 25
Audible Alarm......................................................................................................................................... 25
Zone Hold Mode..................................................................................................................................... 26
Zone Hold Time...................................................................................................................................... 26
Detection Limit ....................................................................................................................................... 26
Loop2 Factor .......................................................................................................................................... 26
Re-Zero Mode ........................................................................................................................................ 26
rd
Navigating to the 3 Setup Screen ........................................................................................................ 27
4 GENERAL OPERATION ............................................................................................................................29
Functional Overview ...................................................................................................................................29
The Zone Screen ........................................................................................................................................29
Leak Level .............................................................................................................................................. 31
Spill Level ............................................................................................................................................... 31
Evacuation Level.................................................................................................................................... 31
Re-Setting the Peak PPM Value............................................................................................................ 31
Alarm Conditions.................................................................................................................................................31
Fault Conditions ..................................................................................................................................................31
Alarms.................................................................................................................................................................31
Functional Overview............................................................................................................................... 31
Responding to Alarms............................................................................................................................ 32
Alarm Detail Screen ............................................................................................................................... 32
Acknowledging Alarms........................................................................................................................... 33
Silencing an Alarm ................................................................................................................................. 33
System Faults .....................................................................................................................................................33
Functional Overview............................................................................................................................... 33
Navigating to the Fault Screen............................................................................................................... 34
Critical Faults ......................................................................................................................................... 34
Non Critical Faults.................................................................................................................................. 35
Reset to Factory Default Settings .......................................................................................................... 35
Clearing System Faults .......................................................................................................................... 35
Viewing Fault Log................................................................................................................................... 36
Viewing Flow Log ................................................................................................................................... 36
The Trend Screen.......................................................................................................................................37
Navigating to the Trend Screen ............................................................................................................. 37
The Calibration Screen ...............................................................................................................................37
Navigating to the Calibration Screen ..................................................................................................... 38
Adjusting Calibration Factor ................................................................................................................... 38
Calibration Procedure ............................................................................................................................ 38
Programming New Gasses .................................................................................................................... 39
The Diagnostic Screen ...............................................................................................................................40
Navigating to the Diagnostic Screen...................................................................................................... 40
Diagnostic Screen Overview.................................................................................................................. 40
Service Mode ......................................................................................................................................... 41
5 MAINTENANCE ..........................................................................................................................................42
Charcoal Filter (Halogen Monitor Only) ................................................................................................. 42
Hydrophobic Filter .................................................................................................................................. 42
Servicing Air Lines & Replacing Termination Filters.............................................................................. 42
End of Line Water Stop .......................................................................................................................... 42
Water Trap ............................................................................................................................................. 42
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Instruction 3015-5074
Gas Monitor – Multi Zone
Fuses...................................................................................................................................................... 42
Clock Battery .......................................................................................................................................... 42
Sample Pump......................................................................................................................................... 43
Intake Manifolds ..................................................................................................................................... 43
4–20 mAdc Interface Board ................................................................................................................... 43
Replacement Parts & Optional Accessories .............................................................................................. 44
Replacement Parts................................................................................................................................. 44
Item Description ..................................................................................................................................... 44
Part Number ........................................................................................................................................... 44
Specifications ............................................................................................................................................. 46
APPENDIX A................................................................................................................................................. 48
APPENDIX B................................................................................................................................................. 49
RS-485 Communication Protocol .............................................................................................................. 49
Overview ................................................................................................................................................ 49
MODBUS RTU Protocol ......................................................................................................................... 49
MZ MODBUS RTU Operation.................................................................................................................... 50
Overview ................................................................................................................................................ 50
Protocol Details ...................................................................................................................................... 50
MZ Monitor Polling ................................................................................................................................. 50
Network Topologies................................................................................................................................ 50
Key Comm Protocol Parameters............................................................................................................ 51
Summary of Registers............................................................................................................................ 52
System Data Register ............................................................................................................................ 53
Status Register ..................................................................................................................................... 54
Fault Code Table.................................................................................................................................... 54
Zone Data .......................................................................................................................................... 55
Alarms & Alarm Acknowledge................................................................................................................ 56
Date Time Register Register................................................................................................................. 57
Sensor Data Register Register.............................................................................................................. 57
Release Zone Hold Register.............................................................................................. 58
Hold Zone Register ............................................................................................................................... 58
MZ Hold Mode........................................................................................................................................ 58
Releasing the Zone hold: ....................................................................................................................... 58
Fault Log Register Register .................................................................................................................. 59
Flow Log Register Register.................................................................................................................. 59
Alarm Log Register................................................................................................................................. 59
Service Mode Register Register ............................................................................................................. 59
Release Service Mode Register ........................................................................................ 60
MZ Service Mode ................................................................................................................................... 60
Releasing the unit from Service Mode: .................................................................................................. 60
PPM Register ....................................................................................................................................... 60
Zone Log Registers ............................................................................................................................... 60
MODBUS Exception Responses............................................................................................................ 61
APPENDIX C................................................................................................................................................. 62
Instruction 3015-5074
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Gas Monitor – Multi Zone
1 Introduction
About This Manual
Thank you for investing in a Bacharach Multi-Zone Gas Monitor.
To assure operator safety and the proper use of the monitor please read the contents of this manual, which
provides important information on the installation, operation, and maintenance of the monitor.
If you have a working knowledge of your gas monitor, you will find this manual useful as a reference tool. If
you are new to the use of gas monitors, this document is educational in the principles of gas detection and the
proper operation of this device by reading this manual thoroughly.
This manual provides important information about the installation, operation, and servicing of the Monitor and
Display Module.
Warnings and Cautions
When used in this manual or as labeled on the gas monitor, the following hazard symbols and/or
associated words are defined as follows:
WARNING: This symbol and/or the use of the word WARNING indicates a potential hazard
associated with the use of this equipment. It calls attention to a procedure,
practice, condition, or the like, which if not correctly performed or adhered to,
could result in death or serious injury.
WARNING: This symbol and/or the use of the word WARNING indicates a potential hazard
from electrical shock. It calls attention to a procedure, practice, condition, or
the like, which if not correctly performed or adhered to, could result in death or
serious injury.
CAUTION: This symbol and/or the use of the word CAUTION indicates a potential hazard
associated with the use of this equipment. It calls attention to a procedure,
practice, condition, or the like, which if not correctly performed or adhered to,
could result in minor or moderate injury.
IMPORTANT: The use of the word IMPORTANT in this manual calls attention to a procedure,
practice, condition, or the like, which if not correctly performed or adhered to,
could result in incorrect performance of or damage to the equipment and may
void the warranty.
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Instruction 3015-5074
Gas Monitor – Multi Zone
Safety Precautions
AC Power Supply
The gas monitor uses a universal power supply that is capable of accepting inputs of 100 to 240 VAC, 50/60
Hz. The monitor’s power consumption is 20 Watts. It is highly recommended that the monitor be connected
directly to the AC power source, preferably on its own circuit with UPS or surge protection.
A switch or circuit breaker must be included in the building installation.
The switch must be in close proximity to the monitor and within easy reach of the operator.
The switch must be clearly marked as the disconnecting device for the equipment.
Protective Grounding
Under no circumstances should the monitor be operated without connection to a protective ground. Doing so
poses a potential shock hazard and is also a violation of electrical safety standards applicable to this type of
equipment.
Explosive Atmosphere
Do not operate this equipment in the presence of flammable liquids, vapors or aerosols. Operation of any
electrical instrument in such an environment constitutes a safety hazard.
Proper Exhaust Venting
It is imperative that the exhaust port on this instrument be properly vented as described in this manual.
Failure to do so may constitute a safety hazard.
Accessing the Interior of the Monitor
Extreme care should be exercised when accessing the interior of the monitor. Only qualified electrical
maintenance personnel should perform connections and adjustments. Always remove AC power before
opening the monitor’s enclosure.
Misuse & Modifications to the Instrument
The protection provided by the monitor may be impaired if the monitor is used in a manner not specified by
Bacharach, Inc. Modifications to this monitor, not expressly approved, will void the warranty.
In Case of Malfunction
Do not continue to use this equipment if there are any symptoms of malfunction or failure. In the case of such
occurrence, de-energize the power supply and contact a qualified repair technician or the nearest Bacharach
Service Center. Use ONLY the provided knockouts for electrical and communication wiring. Drilling into the
box will void the warranty.
Fusing
F1, F2: 1.0 A, 250 VAC, Type “F”
Installation Category
Installation Category II, Pollution Degree II, as defined by UL.
Altitude Limit
6,562 ft (2,000 m)
Cleaning
To clean the outside of the case use a DRY CLOTH. To avoid shock hazard and/or equipment
damage, DO NOT use soap and water.
Instruction 3015-5074
5
Gas Monitor – Multi Zone
Functional Overview
General Description
Gas monitors are specified to support compliance to federal, state and local safety codes governing
emissions. Avoiding significant loss reduces equipment replacement costs, maintains equipment efficiency,
promotes safety, and protects the environment.
The Bacharach Multi-Zone Monitor provides continuous monitoring of gas levels in up to 16 separate test
zones. The instrument is easily programmed to monitor a variety of gasses (dependent on particular model)
and independent leak (small), spill (medium), and evacuation (large) levels may be designated for each zone.
The instrument also retains a log of previous readings that can be easily accessed for analysis.
An audible alarm and front panel indicators are provided to signal alarm and fault conditions, and relay
contacts are provided that can be used to trigger external alarm devices in the event of a system fault, or if a
leak (small), spill (medium), or evacuation (large) level of gas is detected. The system also may be fitted with
and optional two channel 4-20mA current loop board for connection to remote monitoring equipment.
The multi-zone monitor requires only minor periodic maintenance such as the occasional replacement of
filters. The monitor incorporates active diagnostics that continuously check the system for proper operation.
A front panel indicator is provided to alert an operator of system malfunctions, and fault codes are generated
that enable the user to identify the cause of the fault.
Communication Options
The multi-zone monitor features full two-way communications via an RS-485 interface. MODBUS RTU is the
communication protocol standard. The instrument can be connected directly to a Building Management
System or it may be operated as a stand-alone system.
An RS-232C port is also provided for connection to a PC. This enables the monitor to be setup from a
personal computer.
Please refer to the Appendix for a more complete discussion of communication protocols.
Understanding Monitoring Levels
Effective use of this instrument requires an understanding of what constitutes reasonable alarm set points for
the types of gas being monitored. Manufacturers define allowable exposure levels and threshold limit values
in units of parts per million (ppm). In a good “tight” installation these background levels will be acceptably low
and often do not require corrective action. You can reduce nuisance alarms and needless service calls if the
alarm levels are set at practical limits. Bacharach has developed recommended monitoring levels based on
compliance to ANSI/BSR ASHRAE 15-2007 and ASHRAE Safety Code 34-2007. These reference levels are
listed in the Appendix.
Setting the monitor at these recommended alarm levels will satisfy the needs of most users. However, the
ppm levels generated by system leaks into the environment are greatly influenced by the volume of air in the
sampling area, air circulation, size of the leak, distance to the monitoring point, and a host of other variables.
In some cases the set points may need to be adjusted either up or down to achieve effective monitoring.
Response to the Presence of Multiple Refrigerants (HGM Only)
The HGM-MZ is a refrigerant level monitor, not a gas analyzer. You must program the monitor to test for a
specific refrigerant, and it will only return accurate concentration readings for that particular refrigerant. If a
leak occurs of another refrigerant gas type, the monitor may return incorrect readings.
Most applications only require detection of a single refrigerant and the problems that are associated with
monitoring multiple gases are rarely an issue. If there is a possibility of multiple refrigerants leaking in the
same sampling zone, then you should carefully consider which refrigerant compound you program the unit
to monitor.
Suggested Location of Sampling Points
At the point of a leak the gas is nearly pure. As the gas is dispersed into the air, the gas molecules diffuse,
causing a dilution of the original concentration. The monitor measures the concentration at the sample
collection point. Therefore, if the termination of the collection line is not at the exact point of the leak, the unit
will read a diluted mixture of the gas and air.
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Instruction 3015-5074
Gas Monitor – Multi Zone
It should also be noted that gases of interest are heavier than air and tend to collect below the point of a leak.
Therefore a sample taken near the floor will have a greater concentration of gas than that collected above the
source of a leak. Therefore, sampling points should be located as close as possible to the sources of potential
leaks. If this is impractical, then the alarm set points should be adjusted for that zone to compensate for the
dilution of the gas. Sample inlet filters should be mounted 12-18” above the floor. DO NOT block any of the
zones. Unused zones may be disabled by setting the distance parameter to zero feet in the zone setup
screen.
The MZ monitor should be centrally located in the mechanical room and be readily accessible for easy visual
monitoring and servicing. The combined length of sample tubing, plus exhaust tubing, should not exceed
1200ft. for any zone. The fresh air purge line should draw from an area that does not contain any gas. The
exhaust line should run to an outside location if possible. The combined length of the purge line and the
exhaust line cannot exceed 600 feet.
Ideally, two to three pick up points spaced around each chiller will provide sufficient coverage. It may be
necessary to perform a “smoke” test of the mechanical room to determine the best locations. The smoke test
would provide the pattern of air currents present in the mechanical room.
The MZ monitor should be kept dry. When used in a wet or humid area, it is highly recommended to use the
optional water stop accessory to avoid internal damage.
MZ/RD Gas Leak Monitor Mechanical Room Placement
Exhaust Fan
Sample Inlet
Pickup Point
Auxiliary
Horn/Strobe
Remote
Fresh air purge
from area away
from refrigerant
gas
Outside Hallway
RD
Remote Display
Module outside of
mechanical room
Machine Room
Interior
MZ
Chiller
Gas
Monitor
Sample Inlet Pickup Points
The Remote Display Module should be mounted outside of the mechanical room, or just inside the room’s
doorway if the first option isn’t possible. This is the “split architecture design” for safety of the operator. The
RD can be located up to 4500 feet from the MZ monitor. The RD is the man machine interface by which you
program the MZ, acknowledge alarms and observe conditions inside of the mechanical room. Note that there
are two additional alarm relay contacts in the RD that can be programmed to alarm with “leak, spill, evacuate,
fault or monitor on”.
Instruction 3015-5074
7
Gas Monitor – Multi Zone
2 Installation
Multi-Zone Monitor Front View
Display
Screen
Solenoid
Connections
LED
Indicators
RED:
Alarm
YELLOW:
System
fault
GREEN:
Monitor is
powered on
*Open cover for mounting instructions (page11)
Standard Accessories for a 4-Point System
• 5 Line-End Filters (P/N 3015-3420)
• Charcoal Filter – Halogen Gas Monitor Only (P/N 3015-3125)
• End of Line Filter Assembly - 3 (P/N 3015-5512)
• T-Bolt Bracket (P/N 3015-2969)
• Multi-Zone Instruction Manual (P/N 3015-5074)
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Instruction 3015-5074
Gas Monitor – Multi Zone
Installation Considerations
Warnings & Cautions
WARNING: Explosion hazard! Do not mount the MZ monitor in an area that may contain
flammable liquids, vapors or aerosols. Operation of any electrical equipment in such an
environment constitutes a safety hazard.
WARNING: Shock hazard! Always disconnect AC power before working inside
the monitor.
CAUTION: Drilling holes in the MZ enclosure may damage the unit and will void the
warranty. Please use the knockouts provided for electrical connections.
CAUTION: The MZ Monitor contains sensitive electronic components that can be easily
damaged. Do not touch nor disturb any of these components.
Inspection
The MZ monitor has been thoroughly inspected and tested prior to shipment from the factory. Nevertheless, it is
recommended that the monitor be re-checked prior to installation. Inspect the outside of the enclosure to make
sure there are no obvious signs of shipping damage. Open the enclosure and inspect the interior of the monitor
for loose components that may have become dislodged during shipment. If damage is discovered, please
contact the nearest Bacharach Service Center for assistance.
Location of the Monitor
The MZ monitor should be centrally located in the facility and should be easily accessible for visual monitoring
and servicing. Intake sample lines can be up to 1,200 feet in length, but it is important to remember that
sampling cycle time is proportional to the total number and length of individual sample lines.
Dirt, grease, and oils can adversely affect the operation of the MZ monitor. The monitor should be installed out
of direct sunlight in a clean, dry area that is not subject to temperature or humidity extremes. Installation of the
monitor in a mechanical room is acceptable provided reasonable environmental conditions exist. If there is a
question, consider installing the unit outside of the mechanical room in a cleaner area of the facility.
The location should allow the monitor to be easily accessible for visual monitoring and servicing.
Instruction 3015-5074
9
Gas Monitor – Multi Zone
Mounting Instructions
The MZ monitor should be installed plumb and level and securely fastened to a rigid mounting surface.
The enclosure utilizes keyhole mounting brackets designed for ¼ inch fasteners. Locate the four screws as
shown in the diagram below or by using the provided mounting template (P/N 3015-5109). Allow the screw
heads to protrude approximately ¼”.
MZ Monitor Mounting Specifications
Four ¼ inch fasteners are required to mount
the MZ enclosure. Allow approximately ¼
inch of each fastener to remain exposed. The
enclosure can slide directly onto the screw
heads for mounting. Verify position of
enclosure on fasteners and tighten all
fasteners.
Hold the monitor flat against the mounting surface and allow it to slide down, engaging the screw heads in the
keyhole slots of the mounting brackets. Adjust the screws as necessary to hold the monitor securely against the
mounting surface.
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Instruction 3015-5074
Gas Monitor – Multi Zone
Connecting Air Lines
Overview
Individual sample lines are run from the MZ monitor to each area of the facility to be monitored. Additionally, a
purge line is installed to provide clean air for resetting the infrared zero baseline. All air line connections, located
on the left side of the enclosure, are displayed below.
7
6
5
4
3
2
1
10
11
12
13
14
15
16
Exhaust
Purge
8
9
MZ Monitor Side View
Inlet/Purge
Ports
(see below)
Exhaust
Port
Tubing Considerations
Use ¼” outside diameter (0.040” wall) flex tubing for all air lines (P/N 3015-3235) or equivalent. The tubing
should be clean and free of residual moisture or other contaminants. The tubing should be cut cleanly with a
sharp knife and care should be taken not to distort the tubing end.
To connect the air lines to the monitor simply push the tubing firmly onto the connector. To remove a line,
depress the plastic ring on the connector with one hand while withdrawing the tube with your other hand. All
tubing bends should have a radius of no less than 5” to ensure proper airflow. If kinks or obstructions occur in
any of the air lines the instrument may not function properly.
Connecting Purge Line
A purge line is an intake line that is required to draw fresh air into the instrument and should not exceed 300
feet in length. It is advisable to terminate the purge line outdoors, provided the input is not exposed to rain,
snow, ice, exhaust fumes, or other airborne contaminates. If an outdoor installation is impractical, the line
should be run to an area inside the facility that you are certain is not contaminated with ambient gas. If this is
not possible, an optional charcoal filter assembly (P/N 3015-3125) can be used with the Halogen Gas Monitor
to filter refrigerant from the purge line, it may be mounted adjacent to the monitor. A line-end filter (P/N 30153420) should be attached to the end of the purge line when the charcoal filter is not used.
Connecting Exhaust Line
An exhaust line can be used when it is required to vent gas samples away from the instrument and should not
exceed 300 feet in length. The exhaust line should terminate in a location that is completely isolated from the
purge line termination point and other areas of the facility that will be monitored. Ideally this line should
terminate outdoors in a location that is not exposed to the elements. This line does not require a line-end
filter. If the exhaust line terminates outside the building, position the tubing so that no water or moisture can
enter it.
Instruction 3015-5074
11
Gas Monitor – Multi Zone
Connecting Sample Intake Lines
The MZ monitor is designed to accommodate up to 16 separate sample intake lines. The standard configuration
of the unit includes one manifold of 4 intake connectors and 1 purge connector. Additional manifolds can be
easily installed to increase monitoring capacity (field installation kit P/N 3015-5171, and 4 zone line end filter kit
P/N 3015-3411).
Sample intake lines can be up to 1,200 feet when no exhaust tubing is used. Otherwise, the combined length of
the sample line and the exhaust line cannot exceed 1,200ft. All line terminations should be positioned to reduce
the possibility of mists, aerosols, oil, water, dust, or other contaminates being drawn into the instrument. A lineend filter (P/N 3015-3420) should be attached to the end of each sample intake line. Line-end filters should be
placed 12” to 18” above the floor.
IMPORTANT: DO NOT block any of the zones. Unused zones may be disabled by setting their length
parameter to zero feet in the zone setup screen.
Depending on type of use and location of lines, the end-of-line water stop filter assembly can be used to prohibit
moisture from entering the intake lines. Three (3) end-of-line water stop filters are supplied with a standard unit.
Place the end of the intake line into the blue receiver of the end of line water stop and tighten sufficiently.
NOTE: Only one filter assembly, either the line-end filter or end-of-line water stop, should be used for each line.
Please refer to the earlier section Suggested Location of Sampling Points to learn more about where to place the
ends of the sample intake lines.
Installing Splitter Kit
Splitter Kits are made available which allow the MZ unit to take gas sample readings from several sample points
while utilizing just a single zone. These kits are designed for use ONLY in confined/defined spaces with high
potential for leaks, such as food cases, cold rooms, refrigeration rack rooms, etc. Bacharach’s 2-way (P/N 30155404) and 3-way (P/N 3015-5405) splitter kits are available as an optional accessory. Refer to instruction 30155415 (supplied with kit) for detailed installation instruction.
Connecting the Water Trap
The water trap is an optional accessory for applications that result in water or condensation frequently entering
the intake lines. This is available in a manual style trap (P/N 0007-1655) which is manually emptied once it has
become filled. Install the water trap close to the unit for the most effective results. The intake line may be cut
where the user finds appropriate (preferably close to monitor). Each side of the intake line should be inserted
into the receivers on either side of the water trap. Secure tightly. A replacement filter (P/N 0007-1656) for the
water trap is available and is replaced by unscrewing the clear plastic cup of the water trap, pulling the filter
directly out (do not unscrew), and inserting the new filter into place. Replace the cup of the water trap. If
desired, an optional mounting bracket (0007-1657) may be used to secure the water trap in place.
NOTE: The termination filter (P/N 3015-3420) or end-of-line water stop filter (P/N 3015-5512) should be used,
regardless of the presence of a water trap.
WARNING: Extreme or humid temperatures may cause water to condense in the tubes. A water trap is highly
recommended for use in these scenarios.
12
Instruction 3015-5074
Gas Monitor – Multi Zone
Interior Schematics
Gas inlet
IR Bench
10-PIN Connector
(Detector)
Gas
Outlet
12-PIN
Connector
(IR Source)
IR Source
Connector J5
DET
Connector
J6
*NOTE: The plastic cable ties surrounding the air pump are to ensure safe
handling during shipping. Please remove before operation.
Reinstall a plastic cable around the air pump if the unit is shipped to
Bacharach, Inc. for service or repair. This prevents damage during shipping.
Instruction 3015-5074
13
Gas Monitor – Multi Zone
AC Power / RS-485 / Relay Connector / 4-20 mAdc Current Loop
AC Input
Terminals
Relay
Connectors:
Leak, Spill,
Evacuate,
Fault
RS-485
Connector
Switches / Fuses
Line Fuses
(1 Amp, 250 V)
CPU Reset
14
Instruction 3015-5074
Gas Monitor – Multi Zone
Electrical Wiring
The MZ monitor uses a universal power supply that is capable of accepting inputs of 100 to 240 VAC, 50/60 Hz.
The monitor’s power consumption is 20 Watts. It is highly recommended that the monitor be connected directly
to the AC power source, preferably on its own circuit. The AC power connection should be completed with UL
listed 3-conductor wire (minimum 16 AWG), rated 300 VAC at 105°C.
Locate a convenient service knockout and install electrical conduit in the typical manner.
Locate the AC Input Terminals and Ground Stud on the inside of the monitor. Secure the incoming AC power
neutral (white/blue) and live (black/brown) wires to the LINE 1 and LINE 2 terminals.
Using the supplied crimp-on ring terminals, washers, and nuts, connect the incoming AC power ground wire
(green) to the monitor’s AC Input Ground Stud, and then install a separate wire between the ground stud and the
GND terminal.
Warnings & Cautions
WARNING: Electrical installation should be performed by a certified electrician, and must
comply with all applicable NEC/CEC and local electrical safety codes.
WARNING: Copper conductors for connection to supply mains must be made in
accordance with NEC/CEC and local codes.
WARNING: The AC power ground wire must first be connected to the monitor’s ground
stud. Under no circumstances should this monitor be operated without a protective
ground. Doing so poses a potential shock hazard, and is also a violation of electrical
safety standards applicable to this type of equipment.
CAUTION: Drilling holes in the MZ enclosure may damage the unit and will void the
warranty. Please use the knockouts provided for electrical connections.
A switch or circuit breaker rated 1.0 A, 250 VAC must be attached to the monitor’s AC power leads. This
switch must also be located in close proximity to the monitor, and be in easy reach of the operator. This switch
should also be clearly marked as the monitor’s main AC disconnect device. The circuit breaker or switch must
disconnect all current-carrying conductors (i.e. Live and Neutral).
Multi-Zone AC Input Power and Ground Connections
Instruction 3015-5074
15
Gas Monitor – Multi Zone
Connecting Communication Devices
Remote Display Module (RD) Connection
The MZ is connected to the optional RD using a shielded twisted pair instrument cable. The maximum distance
between the farthest away MZ and RD is 4500 feet.
Use any of the remaining service knockouts to gain access to the interior of the monitor. The RS-485
communication wiring between the MZ and RD must be connected in the following manner:
Locate the RS-485 connector in the MZ (page 15). Connect one lead of a twisted shielded pair to the “B”
connection point (the far right point), note the wire color. Connect the second wire to the “A” connection
point (the middle), note the wire color. Connect the ground to the “
” connection point
Locate the RS-485 connector marked “TO MONITORS” in the RD (See this topic in the RD manual). This
connector is located on the bottom of the RD PC board, second from the right. Make the wire run to the RD
and connect the twisted shielded pair to the RS-485 “TO MONITORS” connector using the same color code
as used on the MZ.
Integrating with Building Management Systems
The MZ may be connected directly to a Building Management System using a shielded twisted pair cable. The
cable from the Building Management System is connected to the RS-485 connector inside the MZ monitor.
MODBUS RTU is the standard communication protocol.
Use any of the remaining service knockouts to gain access to the interior of the monitor. Locate the RS-485
connector and remove it from the circuit board. Secure the wire leads to the connector orienting them as shown
in the diagram below. Check to make sure that the polarity matches the wiring to the Building Management
System. When you are through securing the connections, carefully plug the connector back onto the circuit
board.
Larger Integrated Systems
You may also connect the MZ monitor to a Building Management System through a Remote Display. In this
case, first connect the MZ to the RD as described above. Then, follow the instructions in the Communications
Connections section of the RD manual for information on how to connect the RD to a Building Management
System.
RS-485 Connector
16
GROUND
LEAD A
LEAD B
RS-485
Instruction 3015-5074
Gas Monitor – Multi Zone
Changing Terminator Switch Settings
The terminator switch is shipped from the factory in the terminated or “IN” position. This is the correct setting if
the MZ is connected as a single device, or if it is the last device on the network chain. If the MZ monitor is to be
installed in the middle of a network, the terminator must be moved to the “OUT” position.
Locate the switch (#4) and determine its position. If it must be moved, slide the switch to the appropriate position.
(Switches 1-3 are for service use.)
RS-485
Terminator
Switch
OUT
IN
1
4
Personal Computer
(Refer to the “PC Software” section for details.)
The MZ may be connected to a personal computer using the RS-232 interface on the left side of the enclosure.
Software will be provided upon request or as a download from:
http://www.MyBacharach.com/downloads.htm
Instruction 3015-5074
17
Gas Monitor – Multi Zone
Multiple Monitors
TERMINATOR
“IN”
Multiple MZs With Remote Display
NOTE 1: The last MZ or RD on either end of the network must have its terminator in the “IN”
position, and all other units must have their terminators in the “OUT” position.
Remote
Display
NOTE 2: The total length of the RS-485 cable cannot exceed 4500 feet. (Use instrument
cable 20 gage multi-strand shielded and twisted pair – similar or equal to Belden
cable #8762.)
RS-485 Connections Between Multi-Zones
NOTE: The terminators in the RD and MZ Unit 4 must be in the “IN” position. The terminators
in MZ units 1, 2 and 3 must be in the “OUT” position.
RS-485
MZ UNIT
1 NODE 1
TERMINATOR
“OUT”
MZ
UNIT 2
NODE 2
MZ UNIT 3
NODE 3
MZ UNIT 4
NODE 4
TERMINATOR
TERMINATOR
TERMINATOR
“OUT”
“OUT”
“IN”
Connecting to a Building Management System
The MZ monitor may be connected to a Building Management System via the RS-485 connector. The node
address on each MZ monitor may be set from “1” to “15” in order to identify itself to the Building Management
System. Note that Building Management Systems set to a “0” or “1” address both respond to messages from the
RD as address “1” therefore you should not have a unit set to “0” and another set to “1” on the same network.
If the MZ network is connected directly to a Building Management System it may not be connected to the RD.
However, the RD has two communication ports, an “upstream” port (labeled BMS) and a “downstream” port
(labeled TO MONITORS). A BMS node may be connected to the up stream RD port while the downstream RD
port talks to the MZ monitors. In this case, the BMS is talking “through” the RD to the MZ monitors, but not
physically on the MZ/RD network.
NOTE: If the MZ monitor is not at the end of the line in a series connection, then the terminator on the monitor
must be set to “OUT.” Also, each end of the series must have the terminator set to “IN”.
NOTE: User must have two (2) dedicated ports to successfully complete the required setup.
Multiple Monitors Connected to a Building Management System
TERMINATOR
“OUT”
BMS
18
MZ
NODE 1
MZ
NODE 2
MZ
NODE 3
MZ
NODE 4
TERMINATOR
TERMINATOR
TERMINATOR
TERMINATOR
“IN”
“OUT”
“OUT”
“IN”
Instruction 3015-5074
Gas Monitor – Multi Zone
Multiple Monitors Connected to a Building Management System
Daisy Chain Fashion
BUILDING
MANAGEMENT
SYSTEM
RS-485
TERMINATOR
“IN”
MZ
UNIT 1
NODE 1
TERMINATOR
“OUT”
MZ
UNIT 2
NODE 2
MZ
UNIT 3
NODE 3
TERMINATOR
TERMINATOR
TERMINATOR
“OUT”
“IN”
“OUT”
MZ
UNIT 4
NODE 4
PC Software
NOTE 1: The MZ is compatible with HGM300 PC software version 1.52 and higher. However, calibration data
can only be edited on the front panel of the MZ , not through the PC software or RDM units.
NOTE 2: The PC software uses COM1 by default. Therefore, the interface cable should be connected to the
port configured as COM1 on the PC. Also, no other software drivers or devices in the computer may control
COM1 when the MZ software is in use. Alternatively, COM2 may be used by adding a space and the number
2 to the command line, c:\pc2HGM.exe 2, for example. When using a USB to serial converter, be sure it has
been mapped to COM1 or COM2.
The connection is made through a standard “straight through” serial port connection. A three-wire connection
is used (RXD, TXD, and GND). No hardware flow control is used. The MZ software automatically configures
COM1 to match the MZ RS-232 communications parameters.
NOTE 3: Occasionally, the laptop connection will not connect properly and only two beeps are heard and the
program times out. To resolve this, disconnect the RS-232 cable and cycle power on the MZ and the laptop.
After both are operational, connect the RS-232 cable and start the software program.
1. Apply power to MZ monitor and allow it to warm up.
2. Connect RS-232 interface cable to the PC and RS-232 port on the MZ monitor.
3. Insert software disk into the PC.
4. Open the MZ software using Windows Explorer.
5. Upon start up, the program will immediately attempt to download data from the MZ, as indicated by
several beeps.
Navigate using your PC keyboard:
•
Use the up, down, left and right arrow keys to navigate through the screen options.
•
Use the Enter key to select options.
•
Use the Esc key to go back one step.
6. Go to EDIT. From the EDIT Menu, select SYSTEM. The monitors’ LOCATION becomes highlighted.
Press Enter to move to the TAG area. Use the Backspace key to remove the existing tag. Enter a new
tag. Press Enter to return to LOCATION. Select the next item to be addressed. Note that you cannot
change the “SN” or “FIRMWARE” items. Press the Esc key to return to the menu bar.
Instruction 3015-5074
19
Gas Monitor – Multi Zone
7. Go to EDIT. From the EDIT Menu, select ZONES. Select a specific zone to identify and set parameters.
When REFRIGERANT is selected (Halogen Monitor), scroll through the gas library to locate and select
the gas type for that zone.
8. Setting the Alarms: Select EVAC LEVEL. Use the Backspace key to clear previous setting. Type in the
new PPM level. Use the same method to set the spill level and leak level.
9. To close or bypass a zone: Set the DISTANCE to 0 feet.
IMPORTANT: When a modified parameter (zone, system or calibration) is sent to the MZ monitor,
please wait for the computer software to indicate that the download is complete before continuing with
any further edits.
Saving & Sending Programs
•
When saving to your computer, the program will automatically add “.cfg” to the filename you have
entered.
•
To send a saved program to the MZ, open the program and connect the PC to the MZ. From the
monitor, select SEND SETUP and press Enter. The saved program will be sent to the MZ.
Trend Data
Creating a trend data file must be done while connected to the MZ.
From the computer, select GET TREND DATA. Select the zone that you want to trend and press Enter. The
trend data will appear in a list format. Press Enter again to access the file name screen. Type the file name in
for that particular zone. Press Enter. The file will be saved as a text file that can be converted to an Excel file or
printed as is.
NOTE: The TREND file must be saved Zone by Zone, with a filename per zone.
Converting the TREND Text File to a Microsoft Excel File
Open Excel and the desired file. Select “Delimited” format and “Space” as the delimiter. Select “General” as the
column data format. The text file will display as an Excel file. When saving, change the file name extension to
“.xls”. Comments or notes may be added to this file as needed and saved.
Saving & Printing the MZ Software Screen, Alarm Log,
Fault Log, or Diagnostic Screen
Open the software while connected to the MZ. After the software receives the program, open the desired screen.
Use the Alt and Print Screen key combination on the PC keyboard to capture the image and paste it into a
Word document. Save and print.
USB Type Laptops
Some laptops have USB ports and no RS-232 9-pin ports. A USB to serial converter or PCMCIA to serial
converter will be required if a PCMCIA slot is available You will be required to purchase a PCMCIA card that
provides an RS-232 output. This is necessary for Windows Vista and higher versions. We recommend the
PCMCIA card manufactured by:
SEALEVEL SYSTEMS, INC.
155 TECHNOLOGY PLACE
P. O. BOX 830
LIBERTY, SC 29657
PHONE – 864-843-4343
www.sealevel.com
Part number: 2105 USB to RS232 or PC- SIO-232 PCMCIA CARD
A “straight through” RS-232 cable and a DB25 to DB9 adapter will be required to connect the laptop to the HGMMZ.
20
Instruction 3015-5074
Gas Monitor – Multi Zone
Current Loop Interfaces
Optional 4–20 mAdc Outputs
Upon installation of the optional 4–20 mAdc Interface Board (page 15) (P/N 3015-5152), the MZ has the
capability of providing dual 4-20 mAdc scrolling current loop outputs for connection to external monitoring
devices. Loop outputs are powered internally. Do not use an external power supply as this can damage the loop
card.
The interfaces are set up as follows:
Loop 1 indicates zone area
Loop 2 indicates PPM
An optional remote loop powered display is available to easily manipulate the 4-20 outputs.
Connection
The external devices are connected to the MZ monitor using a shielded dual twisted pair cable. Use any of the
remaining service knockouts to gain access to the interior of the monitor. Locate the Dual 4–20 mAdc Output
connector (page 14) and remove it from the circuit board. Secure the wire leads to the connector orienting them
as shown in the diagram below. Check to make sure the polarity matches the wiring at the external device.
When you are through securing the connections, carefully plug the connector back onto the circuit board.
NOTE: It is highly recommended that a current loop isolator is used when connecting to the 4-20 outputs.
Bacharach recommends the “Dataforth DSCL 21 Loop powered isolator DIN mount.” More detailed information
can be found at www.dataforth.com.
NOTE: When one or both current loop outputs are not used, install a jumper wire between the ground and the
unused loop terminal(s) to prevent the system from generating a current loop fault.
CAUTION: The loop outputs have isolated grounds. Therefore the cable shield
should be terminated at the receiver and not the MZ monitor. The signal for both current
loops must be returned to the MZ monitor.
Current Loop Connector
GROUND
NOTE:
SIGNAL OUT
ONLY DO NOT
APPLY POWER
LOOP 1
ZONE
LOOP 2
PPM
NOTE: The ground connections are common.
LOOP 1 = ZONE
LOOP 2 = PPM
5 mAdc = Zone 1
Default
6 mAdc – Zone 2
0.016 mAdc = 1 PPM
---
Scalable via Software
---
4 mAdc = 0 PPM
20 mAdc = Zone 16
20 mAdc = 1000 PPM
Instruction 3015-5074
21
Gas Monitor – Multi Zone
Connecting External Alarms
Overview
The MZ monitor includes four SPDT relays whose contacts are rated 2 A at 250 VAC (inductive) and 5 A at 250
VAC (resistive). These relays are used for the connection of external alarm devices that are activated when the
relay is energized. The relays are factory assigned to energize under the following conditions:
Relay #1
Relay #2
Relay #3
Relay #4
Leak
Spill
Evacuate
Fault
Alarm Point 100 ppm
Alarm Point 300 ppm
Alarm Point 500 ppm
System Fault Event
Connection
Use the conduit or any of the remaining service knockouts to gain cable access to the interior of the monitor.
Locate the relay connector (page 15) and remove it from the circuit board. Secure the leads to the connector
orienting them as shown in the diagram below. When you are through securing the connections, carefully plug
the connector back onto the circuit board.
MZ Monitor Relay Connector
Each relay may be connected as normally open (NO), or normally closed (NC).
The relay contacts are rated 2 A at 250 VAC (inductive) and 5 A at 250 VAC (resistive).
Power for the alarm devices connected to the relay contacts may be supplied by an external 24 V DC power
source or the monitor’s AC input terminals.
22
Instruction 3015-5074
Gas Monitor – Multi Zone
Figure 1: Power to this device is being tapped off the monitor’s AC input.
Figure 2: Power is supplied from an external power source
Figure 1 - Typical AC External Alarm Relay 1 Wiring
Figure 2 - Typical DC External Alarm Relay 1 Wiring
Jumper the ‘Live/Positive’ line of an external power source (DC devices) or the monitor’s AC input (AC
devices) to the ‘Common’ terminal on the relay connector.
Connect the ‘Live/Positive’ end of the strobe or horn to the ‘NO’ terminal of whichever level of alarm is
appropriate for the application.
For protection, install an in-line fuse of the appropriate size and design for the external alarm device being
used.
The other end of the strobe or horn is connected to the ‘Neutral/Negative’ leg of the external power source
(DC devices) or monitor’s AC input (AC devices).
Instruction 3015-5074
23
Gas Monitor – Multi Zone
3 Setup Programming
Display Screens
Initial Power Up
When the MZ monitor is powered up, all front level panel LEDs will illuminate and a splash screen will appear,
displaying the monitor’s firmware version level. After a moment, the Warm Up screen will be displayed and
the green MONITOR ON light will blink.
After a 15 minute warm up cycle, the MONITOR ON light will glow steadily and the Data Display screen will
be displayed. (See Appendix C for an overview map of the screens in the system.)
Data Display Screen
Navigating to the 1st Setup Screen
•
Use the UP/DOWN arrow keys to select the first text box to access the Setup screen.
•
Press ENTER to select.
System Setup Screen #1
24
Instruction 3015-5074
Gas Monitor – Multi Zone
Navigating to the 2nd Setup Screen
From System Setup Screen #1, select the SYSTEM option to go to System Setup Screen #2. Select the ESC
key to return to the System Setup Screen #1.
HGM System Setup Screen #2
Location
This is the name you assign to the MZ monitor to identify its location. It may have up to 12 alphanumeric
characters.
1. Press the ENTER key to adjust the setting.
2. Use the LEFT/RIGHT cursor keys to move across the entry field and the UP/DOWN cursor keys to
modify the individual characters.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
Number of Zones Installed
IMPORTANT: Do not change the number of zones to deactivate unused zones. Changing the number of
installed zones is only necessary when manifold blocks are added or removed. Go to the individual zone that
you wish to disable and set its distance to zero.
1. Press the ENTER key to adjust the number.
2. Use the UP/DOWN cursor keys to modify the number.
3. Press ENTER to accept the new number or ESC to revert to the previous setting.
Alarm Ack Mode
This function programs the relays in the unit for latching or non-latching operation.
1. Press the ENTER key to adjust the setting.
2. Use the UP/DOWN cursor keys to toggle between settings.
AUTO
–
Non-latching (Alarm relay will automatically de-energize when the gas level drops
below its alarm point.)
MANUAL – Latching (Alarm relay remains energized, and will not release until the alarm condition
has been manually acknowledged. Refer to Acknowledging Alarms on Page 33.)
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
Audible Alarm
This parameter selects the function of the MZ monitors internal audible alarm device.
1. Press the ENTER key to adjust the setting.
2. Use the UP/DOWN cursor keys to select unused, monitor on, evacuate, spill, leak, fault, or alarm.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
Instruction 3015-5074
25
Gas Monitor – Multi Zone
Zone Hold Mode
A zone can be placed on hold and continuously monitored for a length of time determined by the Zone Hold
Time value. To place a zone on hold, select the zone at the top level screen, then press and hold down the
ENTER key until the unit beeps. The word “HOLDING” will appear in the status box.
While in the hold mode, further investigation of the zone’s status can be made by navigating to that Zone’s
Setup Screen #1. To release the zone from the hold mode, press and hold down the ENTER key until the unit
beeps and the screen display returns to normal.
Zone Hold Time
Sets the length of time a zone will be monitored when the zone hold feature is activated. The default is 15
minutes. The range is 1 to 999 minutes.
1. Press the ENTER key to adjust this setting.
2. Use the LEFT/RIGHT cursor keys to move across the entry field and the UP/DOWN cursor keys to
modify the individual numbers.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
Detection Limit
This is essentially a squelch setting that instructs the instrument to interpret PPM readings below the designated
level as 0. The range is 1 to 99 PPM.
1. Press the ENTER key to adjust the setting.
2. Use the UP/DOWN cursor keys to modify the setting.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
Loop2 Factor
This sets the PPM scale factor for current loop number 2. To calculate the current output, multiply the scale
factor by the PPM and add 4. For example, at the default scale factor of 0.016, a measurement of 100ppm would
generate a current output of 5.6 mAdc. The current output cannot exceed the 20 mAdc capacity of the interface.
1. Press the ENTER key to adjust the setting.
2. Use the LEFT/RIGHT cursor keys to move across the entry field and the UP/DOWN cursor keys to
modify the individual characters.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
Re-Zero Mode
This parameter defines the frequency at which the instrument re-zeros the optical sensor.
1. Press the ENTER key to adjust the setting.
2. Use the UP/DOWN cursor keys to toggle between settings.
AUTO
– Sets the instrument to re-zero every 10 minutes.
ZONE CHANGE – Sets the instrument to re-zero at each zone change. This is the most accurate
setting, but increases the time interval between measurement cycles.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
26
Instruction 3015-5074
Gas Monitor – Multi Zone
Navigating to the 3rd Setup Screen
From System Setup Screen #2, select the MORE option to go to System Setup Screen #3. Select the BACK
option to return to System Setup Screen #2.
System Setup Screen #3
NOTE: The RS485 BAUD rate text will be replaced by “Service Timeout” when in Service Mode.
Service Timeout
Displayed in Service Mode. Sets the length of time the Service Mode is in effect. Stops the monitor for up to 300
minutes (5 hrs) to allow for servicing the unit.
1. Press the ENTER key to adjust the setting.
2. Use the LEFT/RIGHT cursor keys to move across the entry field and the UP/DOWN cursor keys to
modify the individual numbers.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
Node Address
Each monitor on the network must has a distinct node address. The node address may be set from 1 to 64.
1. Press the ENTER key to adjust the setting.
2. Use the LEFT/RIGHT cursor keys to move across the entry field and the UP/DOWN cursor keys to
modify the individual numbers.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
Password
This field is used to define a system password. The default setting is 000, which provides no password
protection.
1. Press the ENTER key to adjust the password.
2. Use the LEFT/RIGHT cursor keys to move across the entry field and the UP/DOWN cursor keys to
modify the individual alphanumeric characters.
3. Press ENTER to accept the new password or ESC to revert to the previous setting.
Instruction 3015-5074
27
Gas Monitor – Multi Zone
Accessing Additional Features
Several additional features can be viewed on the System Setup Screen #3 when the monitor is placed in
service mode (refer to Service Mode on page 42). While in service mode, the user can identify the model
number, set digipot values and sensor temperature, and acquire the temperature coefficient.
System Setup Screen #3 (Service Mode)
DET Digipot
The DIGIPOT function allows manual and a more precise adjustment of the digital potentiometer, which controls
the voltage of the IR Detector. The DIGIPOT is auto tuned at every power up.
1. Press the ENTER key to adjust the setting. Once the option is selected the screen will also display the
voltage.
2. Use the UP/DOWN cursor key to modify the Digipot value.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
Sensor Temperature Coefficient
1. Press the ENTER key to adjust the setting.
2. Use the UP/DOWN cursor key to modify the temperature value.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
Acquiring Temperature Coefficient (For factory use only)
Press the LEFT and RIGHT arrow buttons simultaneously to return to the previous screen.
IR Digipot
This option will indicate the electrical parameters of the infrared emitter
28
Instruction 3015-5074
Gas Monitor – Multi Zone
4 General Operation
Functional Overview
Normally each MZ monitor will sequentially perform measurements on its active zones without user input. The
total time it takes a MZ monitor to complete a measurement cycle is directly proportional to the number of active
zones and the physical length of the air lines. Monitors linked together on a network operate independently of
each other and consequently complete their respective measurement cycles at different rates.
The Remote Display operates by polling the network approximately once every 12 seconds to determine the
current status of the MZ monitors. If more than one MZ is connected to the network, it will sequentially poll each
monitor for its status. As a practical matter this simply means that the more complicated the network, the longer it
will take the RD to update the status information for all zones.
The Zone Screen
From System Setup Screen #2, scroll down to select the ZONES option.
Zone Setup Screen #1
Location
This is the name you assign to the MZ monitor to identify its location. It may have up to 12 alphanumeric
characters.
1. Press the ENTER key to adjust the setting.
2. Use the LEFT/RIGHT cursor keys to move across the entry field and the UP/DOWN cursor keys to
modify the individual characters.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
Gas/Refrigerant Type
This displays the kind of gas the MZ is detecting.
1. Press the ENTER key to adjust the setting;
2. Use the LEFT/RIGHT cursor keys to select the type of gas you want the device to detect. (Options differ
depending on model).
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
Instruction 3015-5074
29
Gas Monitor – Multi Zone
Distance
This displays the combined length of the sample tubing plus any tubing on the exhaust port. Total length should
not exceed 1,200ft.
1. Press the ENTER key to adjust the setting.
2. Use the LEFT/RIGHT cursor keys to move across the entry field and the UP/DOWN cursor keys to
modify the individual characters.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
Zone Temperature
This displays the air temperature at the zone being sampled.
1. Press the ENTER key to adjust the setting.
2. Use the LEFT/RIGHT cursor keys to move across the entry field and the UP/DOWN cursor keys to
modify the individual characters.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
Current Detection Reading
This reading displays the current PPM STP level of the selected gas.
Log Interval
The MZ retains a data log of 100 measurements for each zone. The log interval is the number of minutes from 1
to 1440 between each log point. This parameter can be changed from Zone Setup Screen #1 (page 32).
The default setting for this parameter is 1440 minutes (24 hours). If the log interval time is set to 0, then a
measurement is recorded in the trend log after every measurement cycle. Therefore, after the trend log is filled,
it will contain the last 100 measurement points for a zone. If you want the data logged less frequently, increase
this value. It is important to remember that cycle time is dependent on many factors, including the number of
zones monitored, input line length, and the run zeroing mode selected. Before changing this value it may be
useful to first review the log data using the Trend Screen to determine the nominal cycle time.
Navigating to the 2nd Zone Screen
Select the MORE option at the bottom right side of the screen to continue to the next screen containing more
options.
This screen displays the peak PPM value in the upper left side of the screen.
30
Instruction 3015-5074
Gas Monitor – Multi Zone
Leak Level
This is the concentration level in PPM that will activate a leak alarm condition.
1. Press the ENTER key to adjust the value.
2. Use the UP/DOWN cursor keys to modify the setting.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
NOTE: This value must be less than the spill level.
Spill Level
This is the concentration level in PPM that will activate a spill alarm condition.
1. Press the ENTER key to adjust the value.
2. Use the UP/DOWN cursor keys to modify the setting.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
NOTE: This value must be less than the evacuation level and greater than the leak level.
Evacuation Level
This is the concentration level in PPM that will activate an evacuate alarm condition.
1. Press the ENTER key to adjust the value.
2. Use the UP/DOWN cursor keys to modify the setting.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
NOTE: This value must be greater than the spill level.
Re-Setting the Peak PPM Value
Pressing this key resets the current peak PPM level stored in memory and displays it at the top of the screen.
Alarm Conditions
When an alarm condition is detected anywhere on the network the red ALARM LED will glow. Additionally, an
external alarm device may activate and an audible alarm may sound if those features have been enabled.
An inverse flashing box indicates an alarm condition in the affected zone.
You can further investigate the status of the affected zone by pressing the ALARM option on the Data Display
Screen.
Fault Conditions
If a system malfunction occurs, the yellow FAULT LED will glow. Additionally, an external alarm device may
activate and an audible alarm may sound if those features have been enabled.
Alarms
Functional Overview
If the PPM level for any zone exceeds its designated spill, leak, or evacuate thresholds, an alarm condition will
be created. Once the MZ monitor completes a measurement cycle in the affected zone the alarm condition will
be indicated. At that time the red ALARM LED on the MZ monitor will glow. Additionally, an external alarm device
may activate and an audible alarm may sound if those features have been enabled.
The next time the RD polls the affected monitor its red ALARM LED will glow. Additionally, an external alarm
device may activate and an audible alarm may sound if those features have been enabled.
The alarm condition may or may not have to be acknowledged for the system to return to normal operation.
Instruction 3015-5074
31
Gas Monitor – Multi Zone
Responding to Alarms
An operator can respond to the alarms by accessing the Alarm Summary Screen. Navigate to this screen by
selecting ALARM on the first (Data Display) screen.
Alarm Summary Screen
The Alarm Summary Screen displays a list of all alarm conditions pending across the network. The screen is
divided into 8 boxes, and each box represents a single alarm. If more than 8 alarms are pending, the MORE
option will be displayed at the bottom of the screen to permit access to that additional information.
Each box displays the zone number, zone name, and the current PPM reading. A flashing box indicates an
alarm that has not been acknowledged. A static box represents an alarm that has been acknowledged but has
not yet been cleared from the system.
The Alarm Data Log can be reset by pressing a combination of the ENTER and RIGHT arrow buttons while
viewing the log.
Alarm Detail Screen
To further investigate an alarm, press the ENTER key to go to the Alarm Detail Screen.
Alarm Detail Screen
The Alarm Detail Screen displays more comprehensive information about the nature of the alarm including:
32
•
Complete location information
•
Gas type and current concentration (CONC NOW)
•
Peak concentration and peak time
Instruction 3015-5074
Gas Monitor – Multi Zone
•
Type of alarm, alarm time, and date
This screen provides the following navigation options at the bottom of the display:
ACK
Using the left arrow key, acknowledges the alarm as described in the next section
SETUP Using the right arrow key, navigate to the Zone Setup Screen #1. This enables review of the
zone setup parameters and access to the Trend Screen.
Use the ESC button on the front case to go back to the previous menu.
Acknowledging Alarms
Each pending alarm may require, depending upon selected alarm mode, acknowledgment before the system
returns to normal operation (refer to Alarm Ack Mode on page 25). To acknowledge an alarm, navigate to the
Alarm Detail Screen and select the ACK option as previously described. You will then be returned to the Alarm
Summary Screen and the box associated with that alarm will no longer be blinking, indicating that the alarm has
been acknowledged. Repeat this procedure to acknowledge any remaining alarms.
Alarm Summary Screen (Acknowledge Mode)
Once all the alarms associated with a given MZ monitor are acknowledged, its RED LED will turn off and any
external alarms connected to the MZ relays will de-activate. All pending alarms across the entire network must
be acknowledged before the Remote Display returns to normal operation. Once that occurs, its RED LED will
turn off and any associated external alarms connected to the RD relays will de-activate.
Keep in mind that the system will continue to generate new alarms if PPM values above the alarm thresholds are
detected.
Silencing an Alarm
When alarms are active, the ESC key functions as a silence key. During an active alarm and with the main
screen displayed, press the ESC key. This will generate a prompt to “PRESS ENTER TO CONFIRM
SILENCE”. When ENTER is pressed, the LEAK relay will open and the internal audible alarm (if enabled) will
turn off. In this way, when the LEAK relay is used to operate strobes and horns, they can be quickly silenced
without effecting the SPILL or EVAC, which may be controlling fans or ventilation equipment. This ‘silence’
mode will be indicated by a reverse flashing ‘S’ in the alarm window. The ‘silence’ mode will be automatically
canceled if the alarm condition of any zone changes by clearing or elevating to a higher level.
System Faults
Functional Overview
If a system malfunction occurs, the yellow FAULT LED will glow. Additionally, an external alarm device may
activate and an audible alarm may sound if those features have been enabled (pages 25 & 29).
Instruction 3015-5074
33
Gas Monitor – Multi Zone
The next time the Remote Display polls the affected monitor its yellow FAULT LED will also glow. Additionally,
an external alarm device may activate and an audible alarm may sound if those features have been enabled
(pages 25 & 29).
Depending on the nature of the fault, the MZ monitor may or may not continue to operate normally. Under a noncritical fault condition, the MZ will continue to measure and log data, but some peripheral functions may be
compromised. Under a critical fault condition, action is required for the MZ monitor to operate normally. The table
on the following page lists the various fault conditions and explains what action should be taken to correct the
problem. Note that the fault codes are cumulative. For example, a code <4200> is both a <4000> “REZERO
VOLT TOL” and <0200> “GAIN SET FAULT” combined, indicating two simultaneous faults.
Navigating to the Fault Screen
Displayed on the initial Data Display Screen is a Fault option. Scroll down with the cursor key and select this
option, which will introduce you to the Fault Screen.
Fault Screen
Critical Faults
• NO FLOW ON ZONE <0800> – Go to the Data Display Screen and press the FAULT key. This will
display a “NO FLOW” message in each individual zone affected. Check for a blockage in the air sample
line or at the line end filter. Once the blockage has been cleared, the MZ monitor will return to normal
operation after the zone has been sampled. NOTE: This can take some several minutes since it is
dependent upon how many zones there are and their lengths. The MZ will clear the fault the next time it
polls the effected zone and the RD will return to normal operation the next time that it polls the MZ.
• NO FLOW ON PURGE <1000> – Check the purge line for a blockage. Verify that the length of the purge
line and exhaust line do not exceed 500 feet in length.
• CLIPPING FAULT <8000> – The detector voltage may be out of tolerance. Refer to the Diagnostic
Screen for the DET voltage, AVE voltage and ZERO voltage. If necessary, call the factory with this
information for further instructions.*
• REZERO VOLT TOL <4000> – The detector output voltage is out of tolerance. Refer to the Diagnostic
Screen. If necessary contact factory for assistance.*
• OVER RANGE DETECTED <2000> - This indicates that the measured concentration on one or more
zones have exceeded the measurement range.*
• ZERO FILTER FAULT <0100> - Indicates contamination in the purge air, or if a charcoal filter is in use, the
filter may need to be changed.
• GAIN SET FAULT <0200> - Indicates sensor gain (digipot) is outside acceptable range. *
• A2D FAULT <0400> - Analog to digital converter not working.
34
Instruction 3015-5074
Gas Monitor – Multi Zone
* These faults may be cleared by checking and adjusting the detector voltage and/or IR voltage. To access
these settings, enter the SETUP menu and enter SERVICE MODE ENTRY by selecting it twice (2x). Enter
the SYSTEM SETUP menu and select MORE to get to the adjustment screens. In the MORE screen you
have access to the DET DIGIPOT and IR DIGIPOT voltage adjustments. Select the item that you want to
adjust and use the arrow keys to more to it, then press ENTER which will allow you to see the voltage and
make adjustments. Use the UP/DOWN arrow keys to enter appropriate value. The DET DIGIPOT should
be between 4.24 and 4.28 VDC. The IR DIGIPOT should be V=5.5.
Non Critical Faults
• BOX TEMP FAULT <0001> – Enclosure’s internal temperature is outside normal range (or IR sensor has
failed). Check the installation to verify that the monitor is not being subjected to extreme temperatures.
Verify that the ventilation holes are not obstructed. Refer to the Diagnostic Screen for the ZERO
temperature, BNCH temperature and BOX temperature. Call the factory with this information for further
instructions.
• BENCH TEMP FAULT <0002> – Optical bench is outside of normal operating range (or sensor has failed).
Check the installation to verify that the monitor is not being subjected to extreme temperatures. Check the
Diagnostic Screen for the ZERO temperature, BNCH temperature and BOX temperature. Call the factory
with this information for further instructions.
• PRESSURE SENSOR <0004> – Manifold pressure is outside normal operating range (or sensor has
failed). Check the Diagnostic Screen record ALL data. Call the factory with this information for further
instructions.
• RS485 FAULT <0008> - RS485 Communication Error.
• LOOP FAULT <0010> – This would only be displayed if the dual 4-20 mAdc option was installed and one or
both current loops are open. Check the wiring to load/monitoring circuit on both 4-20 mA loops.
• CONFIG FAULT <0080> – There is an error in Setup Screen #2 – Number Zones Installed field, or in RDM
Setup Screen #1 – Number of MZ monitors on Network field. Check that the number of zones installed for
each MZ unit and the actual number of MZ units on the network are properly programmed. Check to ensure
that the manifold solenoid cable connector in each MZ unit is securely fastened to its terminal connector.
Check for an illegal parameter. If necessary, reset to the factory default settings.
Reset to Factory Default Settings
IMPORTANT: Performing this function wipes out all program parameters, alarms, faults, trends and log files.
Resetting the MZ Monitor –
1.
2.
3.
4.
5.
6.
Press and hold down the UP and DOWN arrow keys on the MZ monitor (page 14)
Cycle AC power OFF then ON
Hold the keys until the second beep is heard
The screen will indicate “This unit has been reset to factory default conditions”
Release the keys
Reprogram the MZ as described in the MZ Monitor – Setup Programming section on page 22
Clearing System Faults
If the fault condition is associated with an MZ, the monitor will return to normal operation soon after the problem
is corrected. At that time the YELLOW LED will turn off and any external alarms connected to the monitor’s
alarm relays will also turn off. The RD will return to normal operation the next time it polls the affected MZ
monitor.
Once the system malfunction has been corrected it may take some time for the fault condition to clear
completely. If the fault is associated with a specific zone, the MZ must first cycle back to the affected zone
before it returns to normal operation. At that time the YELLOW LED will turn off and any external alarms
connected to the monitor’s alarm relays will also turn off. The RD will return to normal operation the next time it
polls the affected monitor.
Instruction 3015-5074
35
Gas Monitor – Multi Zone
Viewing Fault Log
A data log of the last 20 fault conditions is retained in memory. On the Fault Screen, select the LOG option to
view a display of the fault log.
Fault Log Screen
This screen lists potential fault conditions in the left column and displays a check mark indicating which problems
were associated with each fault condition as represented by the vertical cursor bar. As you move the bar
horizontally using the LEFT/RIGHT cursor keys, the date and time the fault condition was detected is displayed
in the upper right hand corner of the display window.
Anytime the fault status changes, there is an entry in the fault log, both when the fault occurs and when it is
cleared.
The Fault Log can be reset by pressing a combination of the ENTER and RIGHT arrow buttons while viewing the
log.
Viewing Flow Log
On the Fault Log screen, press ENTER to access the Flow Log screen. The Flow Log displays the last 20 flow
events for all zones and the purge port.
Flow Log Screen
ZONES 1 - 8
UP/DN KEY TOGGLES ZONES
This screen lists the zones in the left column and displays flow data. Use the UP/DOWN buttons to scroll through
the zones and the LEFT/RIGHT to scroll through the log data. As you move the bar horizontally, the date and
time of the condition is displayed in the upper right hand corner.
The Flow Log can be reset by pressing a combination of the ENTER and RIGHT arrow buttons while viewing the
log.
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Instruction 3015-5074
Gas Monitor – Multi Zone
The Trend Screen
Navigating to the Trend Screen
From the Zone Screen, select the Trend option on the bottom left side. This will open the Trend screen.
Trend Screen
The trend graph opens with the cursor located over the most recent data point. Use the LEFT/RIGHT cursor
keys to move the cursor to different data points. Holding a key down will cause the cursor to move rapidly across
the screen. As you move the cursor position, the date and time of that reading, along with the PPM value, are
displayed at the top of the screen above the graph. The trend graph is automatically scaled to accommodate the
largest PPM value displayed. The ZOOM OUT and ZOOM IN options allow you to adjust the vertical scale of the
graph.
st
The trend data is stored on a first-in, first-out basis. After 100 trend values have been stored the 101 value will
replace the first value stored. Therefore, in normal operation, when entering trend mode the cursor will be
located at the most recent data point. The data points to the left of the initial cursor location will be the next most
recent. The data point to the right will be the oldest data point in the buffer and will be over written by the next
data point.
The Trend Data Log can be reset by pressing a combination of the ENTER and RIGHT arrow buttons while
viewing the log.
When finished, press the ESC key to revert to the previous screen.
The Calibration Screen
Overview
The Calibration Screen is used to adjust the calibration factor for each gas. It is also used to program the
instrument for new gasses.
IMPORTANT: Changing information on CAL FACTOR will VOID the factory calibration. Typically, the unit will
remain within the factory-calibrated accuracy indefinitely and no calibration is required. Complex software
algorithms adjust for temperature drift, IR source aging, and pressure changes in order to keep the unit within
factory accuracy specifications.
Instruction 3015-5074
37
Gas Monitor – Multi Zone
Navigating to the Calibration Screen
On the System Setup screen, select the Calibration option (CAL).
Calibration Screen
Adjusting Calibration Factor
The factory default cal factor for standard units is 1.000. This value may be different if the high accuracy option
is ordered.
Proceed as follows to adjust the current calibration factor:
1. Use the PREV GAS or NEXT GAS options to scroll through the list of gases until the gas you wish to
work with is displayed.
2. Select the CAL FACTOR option to edit the value.
3. Use the LEFT/RIGHT cursor keys to move across the entry field and the UP/DOWN cursor keys to
modify the individual numbers.
4. Press ENTER to accept the new entry or ESC to revert to the previous setting.
Calibration Procedure
The CAL FACTOR is determined by sampling a known dilution of the type of gas to be sampled. The sample
must be prepared to less than half the desired accuracy and the concentration must be corrected for ambient
temperature and pressure at the time of measurement.
Calibration is best performed at or near full scale (1,000 PPM). It can, however, be done at any concentration,
and ideally in the range where maximum accuracy is desired down to, but not below, 100 PPM.
A cylinder of the desired gas at a certified PPM level must be used to assure sampling occurs at ambient
conditions. A minimum sample size of 5 liters is required.
The MZ monitor should be operating for at least one hour prior to performing a calibration.
Prepare the MZ for sampling by initially setting its CAL FACTOR to 1.000. Next, set up the MZ for a logging
interval of zero minutes, and place the MZ monitor in its zone hold mode for the zone you wish to use for
calibration purposes.
Connect the sample bag directly to the intake port for the zone you have set up and allow the MZ monitor to
sample the entire bag. When sampling is complete, view the trend data for the zone used to sample. Read the
measured PPM by placing the cursor on the spikes cause by the sample. If the bag was large enough for
multiple samples, average the most stable ones.
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Instruction 3015-5074
Gas Monitor – Multi Zone
The new CAL factor is computed by dividing the known gas value by the measured value. Typically this value
will be between 0.95 and 1.05. This value is stored in non-volatile memory.
Programming New Gasses
As new gasses come into use the MZ monitor allows the addition of these new gases to its on-board gas library.
At the end of the gas library list is an option labeled CUSTOM for adding new gases. From the Calibration
Screen use the LEFT/RIGHT arrows to select CUSTOM from the list of gasses. Next, press ENTER, and use
the UP/DOWN arrow keys to enter the calibration factor. The selection of the matching gas and CAL factor is
performed by Bacharach by analyzing the new gas. Once the matching gas is determined, field calibration is
possible by using the same procedure as for other gasses. When the new gas entry is complete simply setup the
appropriate zone for CUSTOM.
Program the instrument for a new gas as follows:
1. From the Calibration Screen, use the PREV GAS or NEXT GAS options to scroll through the list of
available choices until the CUSTOM option is displayed.
Custom Gas Screen
2. Select the CUSTOM option. Press ENTER to accept the new entry or ESC to revert to the previous
setting.
3. Enter the new CAL Factor as received from Bacharach.
Instruction 3015-5074
39
Gas Monitor – Multi Zone
The Diagnostic Screen
Navigating to the Diagnostic Screen
On the System Setup screen, select the Diagnostic option (DIAG).
Diagnostic Screen
01 ZONE 1 LOC
F
DET
4.2251V
F
AVE
4.2273V
F
ZERO 4.2267V
NOISE 0.0009V
AVEAU 0.00014
UM/L
0.000B
PPM
0.7B
R134A NOW ZERO DELTA
F
BENCH 27.78C
F
BOX 29.97C
PRES 13.63PSIA
VAC 11.34PSIA
AMB 14.54PSIA
FAULT CODE=0000
Optical Sensor
Output Voltages
F
Receive port # bytes
Transmitport # bytes
Modbus function
Register address
0.000AMB
0.8STP
27.80C -0.02C
29.96C 0.01C
-0.85 DP F
-3.20 DP
2.29DV F
0100 FEET
Absorbance &
concentration data
Tempsat last purge
& difference from
current temps
Manifold - ambient
Vacuum - ambient
Manifold - vacuum
Programmed length
of tubing for active
zone
Indicates parameter is out of
tolerance & causing a fault condition.
Diagnostic Screen Overview
The Diagnostic Screen contains sensor data and status information useful for trouble shooting various fault
conditions. An explanation of the information provided on each line of this screen is listed below, including
normal operating ranges.
DET: Detector Voltage – Peak-to-peak output of the IR sensor. In the absence of gas, this value range
is 4.100V to 4.300V.
AVE: Average Detector Voltage – Running average of the values displayed in line 1.
ZERO: Zero Voltage – IR sensor output that was stored during the last purge cycle and has the same
range as line 1.
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Instruction 3015-5074
Gas Monitor – Multi Zone
NOISE: A 16 point running average of the noise portion of IR bench output. This reading is valuable
mostly when gas is not present.
AVEAU: Average Absorbency – Optical absorbency computed from the Average Detector Voltage and
Zero Voltage. In the absence of selected gas, the absorbency is 0.000AU. When sampling desired gas,
its value varies proportionally with the gas concentration.
UM/L: uMoles/L – Absolute concentration in micro-moles per liter of gas based on Noise and the
internal calibration. There are two figures displayed. The first (annotated by a B) is the actual
measurement at the IR bench. The second is the calculated value corrected to ambient conditions
(temperature + pressure).
PPM: Parts Per Million is the volume concentration referenced to standard temperature and pressure
and is computed from the Average Absorbency, Zero Temperature and Ambient Pressure. There are two
figures displayed. The first (annotated by a B) is the actual PPM at the IR bench. The second is a PPM
reading normalized to standard temperature and pressure.
ZERO: Zero Temperature – Displays the sensor and enclosure temperature measured and stored
during the last purge cycle in degrees C.
BENCH: Bench Temperature – Current IR sensor temperature in degrees C as well as the raw voltage
coming from the temperature sensor. This value can range from ambient to ambient +15 degrees C.
BOX: Box Temperature – This is the current internal enclosure temperature along with the raw voltage
from the temperature sensor, and has the same range as the Bench temperature.
PRESS: Pressure – This is the current absolute manifold pressure in PSIA along with the output voltage
of the pressure sensor. This value should always be 0.2 to 1.0 PSIA below ambient (AMB).
VAC: Vacuum – The vacuum pressure is measured every purge cycle by closing all sample valves. Its
value is typically 2.5 to 4.0 PSIA below ambient pressure.
AMB: Ambient – Ambient pressure is measured every purge cycle with the sample pump off and the
manifold open. Its value is weather and altitude dependent and can range from 10.0 to 15.5 PSIA.
FAULT CODE: See Fault Code list.
(XXXX FEET): Programmed length of tubing for an active zone.
MODBUS data:
485 RX=x
485 TX=x
FUNC
REG=xxxxx
Receive port number of bytes
Transmit port number of bytes
Function
Register address
Service Mode
The Service Mode option is located on the System Setup screen in the bottom right corner.
When activated, the Service Mode will disable the MZ unit for a specified length of time. The default is 60
minutes. This time interval can be changed as described in the Service Timeout section on page 28.
IMPORTANT: Note that while in the Service Mode no measurements are made, nor are any alarms activated.
Access the service mode options from the initial Data Display Screen. Press the SERVICE MODE ENTRY
option twice within 3 seconds.
To exit the Service Mode, again press the SERVICE MODE ENTRY option twice within 3 seconds.
Instruction 3015-5074
41
Gas Monitor – Multi Zone
5 Maintenance
Warnings & Cautions
WARNING: Shock hazard! Always disconnect AC power before opening the enclosure of
the monitor.
CAUTION: The MZ monitor contains sensitive electronic components that can be easily
damaged. Do not touch nor disturb any components. Do not dislodge electrical wiring or
pneumatic tubing.
Charcoal Filter (Halogen Monitor Only)
The charcoal filter removes refrigerant gas from the purge-air stream during the purging process. Replace the
charcoal filter (P/N 3015-3125) approximately every 6 months, when a zero filter fault occurs (fault code
<0100>), or after the monitor has been exposed to unusually high levels of refrigerant gas, such as after an
evacuation alarm.
Hydrophobic Filter
The hydrophobic filter prevents water from entering the IR detector. A zone flow fault will occur (fault code
<0800>) if this filter becomes blocked. Replace the hydrophobic filter as required (P/N 0007-1650).
Servicing Air Lines & Replacing Termination Filters
The gas sample line and optional exhaust line should be periodically checked for obvious signs of kinks, damage
and contamination. Replace the tubing as required (P/N 0304-3235).
The gas-sample line filter and purge-line termination filters prevent dust and dirt from entering the monitor. Both
of the filters should be periodically checked and replaced when there are obvious signs of contamination.
•
A zone flow fault will occur (fault code <0800>) if the gas-sample line filter becomes blocked
•
A purge flow auto will occur (fault code <1000>) if the purge-line filter becomes blocked.
Remove the filter from the line and replace it with a new one (P/N 3015-3420).
End-of-Line Water Stop
The end-of-line water stops (P/N 3015-5512) prevent contaminates and moisture from entering the monitor.
This filter should be periodically checked and replaced when there are obvious signs of contamination.
Water Trap
The water trap removes moisture that enters tubing before allowing it to enter the internal components of the
MZ unit. The water trap should be emptied often as condensate accumulates. The water trap filter should be
periodically checked and replaced when there are obvious signs of contamination.
Fuses
The MZ monitor is protected from electrical damage by two, 1A, 250 V, type “F” fuses. Locate the fuse holders
(page 15) and carefully remove the fuses from their holders. Inspect and test the fuses with an ohm meter for
continuity. Replace the fuses as required (P/N 04-2620). Battery shelf life is 10 years.
Clock Battery
The clock battery maintains the correct date and time when AC power is not applied to the monitor. Replace
this battery approximately every 5 years (P/N 204-0020).
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Instruction 3015-5074
Gas Monitor – Multi Zone
Sample Pump
The sample pump draws the gas sample into the monitor through the IR detector and discharges the sample via
the exhaust port. To replace the pump, remove the inlet and outlet tubing, disconnect the AC power wires from
the pump and remove the pump from the monitor. Install a new sample pump (P/N 3015-5176).
Intake Manifolds
Up to three additional intake manifolds (P/N 3015-5171 & 3015-3411) can be installed in the MZ monitor to
increase the total capacity to 16 zones. Each manifold requires a sample line end filter for each of the 4 zones.
Please follow the instructions provided to install the manifolds. Then follow the instructions earlier in this manual
to install the air lines and complete the zone programming steps. The MZ setup must also be updated to
recognize the new zones.
4–20 mAdc Interface Board
The optional 4–20 mAdc Interface Board (P/N 3015-5152) allows the operator to take advantage of the current
loop interfaces provided for connection of external devices to the MZ monitor. The interface board plugs into the
sockets provided on the valve/pump drive PCB, and the external devices are then cabled to the MZ monitor as
described earlier in this manual.
Manual Water
Trap
(P/N 0007-1655)
Instruction 3015-5074
Charcoal Filter
(P/N 3015-3125)
Line End Filter
Assembly
(P/N 3015-3420)
Line End Filter
(P/N 3015-2906)
End-of-Line
Water Step Filter
Internal
Hydrophobic Filter
(P/N 3015-5512)
(P/N 0007-1650)
43
Gas Monitor – Multi Zone
Replacement Parts & Optional Accessories
Replacement Parts
Item Description
Part Number
HGM-MZ complete assembly (4 Zone)
3015-5043
(8 Zone)
3015-5044
(12 Zone)
3015-5045
(16 Zone)
3015-5046
AGM-MZ complete assembly (4 Zone)
3015-5047
(8 Zone)
3015-5048
(12 Zone)
3015-5049
(16 Zone)
3015-5050
Battery: Panasonic CR2032, 3V
0204-0020*
Filters:
Charcoal, Zero Air
3015-3125
Hydrophobic (Internal)
0007-1650
End of Line – Assembly
(Termination/gas sample line)
3015-3420
End-of-Line (Filter Only)
3015-2906
End-of-line water stop
3015-5512
Charcoal Filter Mounting Bracket
3015-2969
Fuse: 1.0 A, 250 V, Type “F”
0004-2620
Replacement Pump
3015-5176
Tubing (HGM):¼ in OD (250 ft.)
3015-3235
Tubing (AGM): ¼ in OD (250 ft.)
0304-5111
¼” to 6mm Reducer Kit
3015-5389(10)
3015-5390(8)
IR Bench Replacement Kit (HGM)
3015-4572
IR Bench Replacement Kit (AGM)
3015-4492
Universal Power Supply
3015-5523
Main PC Board Replacement
3015-5483
Key Pad PC Board
3015-5521
Display PC Board
3015-5522
Power Entry PC Board
3015-5524
Solenoid Valve Manifold Drive PC Board
3015-5542
5 Zone Solenoid Block (Zones 1-4/Purge Port)
3015-5080
4 Zone Solenoid Block
3015-5072
*Warning: In compliance with agency approvals & safety regulations, the
battery must be replaced with the specified Bacharach replacement part.
44
Instruction 3015-5074
Gas Monitor – Multi Zone
Optional Accessories
Surge Protectors: 120 V
3015-4121
230 V
3015-5530
4-20 mA
3015-4123
Alarms:
Audible/Visual 120 VAC
3015-3076
Audio-Visual Alarm, 9-28 VDC, Surface Mount
3015-5490
Audio-Visual Alarm, 9-28 VDC, Panel Mount
3015-5491
Audio Alarm, 9-28 VDC, Surface Mount
3015-5492
Audio Alarm, 9-28 VDC, Panel Mount
3015-5493
Annual Maintenance Kits:
4 Zone Monitor (5 line end filters, 1 charcoal filter, 1
hydrophobic, 3 end-of-line water stop filters)
3015-5525
8 Zone Monitor (9 line end filters, 1 charcoal filter, 1
hydrophobic, 3 end-of-line water stop filters)
3015-5526
12 Zone Monitor (13 line end filters, 1 charcoal filter,
1 hydrophobic, 3 end-of-line water stop filters)
3015-5527
16 Zone Monitor (17 line end filters, 1 charcoal filter,
1 hydrophobic, 3 end-of-line water stop filters)
3015-5528
Gases:
R-22 Gas Cylinder, 100 PPM
3015-3850
R-134a Gas Cylinder, 100PPM
3015-3851
R-123 Gas Cylinder, 100 PPM
3015-3852
R-22 Gas Verification Kit
3015-3430
R-134a Gas Verification Kit
3015-3437
R-123 Gas Verification Kit
3015-3438
Water Traps:
Instruction 3015-5074
Manual Drain Water Trap
0007-1655
Manual Drain Water Trap Replacement Filter
0007-1656
Manual Drain Water Trap Mounting Bracket
0007-1657
Interface Board, 4-20 mA
3015-5152
Variable Flow Regulator
3015-3849
Four Zone Expansion Kit (must order Filters, 3015-3411,
in conjunction with kit)
3015-5171
Four Zone End-of-Line Filters Kit
3015-3411
Splitter Kit (2-way)
3015-5404
Splitter Kit (3-way)
3015-5405
Remote Loop Powered Display Assembly
3015-4992
45
Gas Monitor – Multi Zone
Specifications
HGM-MZ Specifications
Product Type
Multiple refrigerant gases and multiple area monitoring system for low level continuous
monitoring of CFC, HCFC and HFC refrigerant gasses used in most commercial
refrigeration systems. System design supports compliance to the refrigerant monitoring
requirements of ANSI/BSR ASHRAE 15-2007 and ASHRAE Safety Code 34-2007.
Gas Library:
CFC:
HFC:
R-11, R-12, R-113, R-114, R-502, HFP
R-404a (HP62), R-407a, R-407c (AC9000), R-134a, R-410a (AZ20), R-507 (AZ50),
R-508b (SUVA95), R236FA, R125, R245Fa, R422a, R422d, R427a
HCFC:
R-22, R-123, R-124, R-500, R-503, R-401a (MP39), R-402a (HP80), R-402b (HP81),
R-408a, R-409a, R-23, R21, R227
HALON:
Other:
H1301,H2402, H1211
FA188, FC72, N1230, R427A, HFO1234YF, R424A, R426A, R427a, R438A
Sensitivity
All gasses 1 ppm (R11 ±10 ppm ±15% of reading 0-1000ppm)
Measuring Range
All gasses 0 to 10,000 ppm
Accuracy
±1ppm ±10% of reading from 0-1000ppm (R11 ±10ppm ±15% of reading 0-1000ppm)
AGM-MZ Specifications
Product Type
The AGM-MZ provides multiple area monitoring system for low level continuous
monitoring of Ammonia gasses used in most commercial systems.
Gas Library
Ammonia / NH3 / R-717
Sensitivity
20 ppm
Measuring Range
Ammonia: 25 to 10,000 ppm
Accuracy
±10 ppm ±10% of reading from 0-10,000 ppm
General Multi-Zone Specifications
46
Instruction 3015-5074
Gas Monitor – Multi Zone
Coverage
4 point standard, expandable to 16 points in 4 point increments
Detector Type
Infrared Non-Dispersive
Front Panel
3 Indicator lights:
• Green = Monitor is powered on. LED glows during normal operation; flashes when unit
is in warm-up mode
• Red = Alarm. LED flashes when any point has exceeded the alarm setting.
• Yellow = Fault. LED flashes when there is a system fault
Size/Weight
12.23" H x 13.7" W x 4.96" D / 15 lbs.
Sampling Mode
Automatic or manual (hold)
Re-Zero
Auto or on zone change
Response Time
5 to 315 seconds – depending on air line length and number of zones
System Noise
Less than 40dB(A) @ 10 feet (3m)
Monitoring Distance
1,200 ft. maximum for combined length of sample + exhaust tubing (each zone)
Conditioned Signal
Dual optional 4-20mAdc isolated outputs. Channel 1 = zone area, Channel 2 = PPM
Alarms
Four SPDT alarm contacts are provided rated 2A at 250VAC(inductive) 5 A at 250 VAC
(resistive).
Three assigned to PPM level alarms, one assigned to system faults
Communications
Full two-way communication with Remote Display Module or Building Management
System via RS-485 serial interface. RS-232C communication port standard
Power Safety Mode
Fully automatic system reset. All programmed parameters retained.
Operating Temp
32 to 122 °F (0 to 50 °C)
Ambient Humidity
5% to 90% RH (non-condensing)
AC Power
100 to 240 VAC, 50/60 Hz, 20 W
Certification
UL 61010-1, CAN/CSA 22.2 No. 61010-1 & CE Mark
Warranty
2 years from date of shipment
Altitude Limit
6,562 ft (2,000 m)
Sensor Life
7-10 years
Instruction 3015-5074
47
Gas Monitor – Multi Zone
Appendix A - Recommended Alarm Settings & Gas Enumeration
Refrigerant/Gas
R11
Leak PPM
Spill PPM
Evacuate PPM
Decimal
Hex
100
300
500
0
00
01
R12
100
300
500
1
R22
100
300
500
2
02
R23
100
300
500
3
03
04
R113
100
300
500
4
R114
100
300
500
5
05
R123
25
35
50
6
06
R124
100
300
500
7
07
08
R134A
100
300
500
8
R401A
100
300
500
9
09
R402A
100
300
500
10
0A
R402B
100
300
500
11
0B
0C
R404A
100
300
500
12
R407A
100
300
500
13
0D
R407C
100
300
500
14
0E
0F
R409A
100
300
500
15
R410A
100
300
500
16
10
R500
100
300
500
17
11
R502
100
300
500
18
12
13
R503
100
300
500
19
R507
100
300
500
20
14
R508B
100
300
500
21
15
16
H1301
100
300
500
22
R408A
100
300
500
23
17
FA188
100
300
500
24
18
R236FA
100
300
500
25
19
1A
N1230
100
300
500
26
R227
100
300
500
27
1B
HFP
100
300
500
28
1C
FC72
100
300
500
29
1D
1E
R21
100
300
500
30
R125
100
300
500
31
1F
H1211
100
300
500
32
20
21
H2402
100
300
500
33
R245FA
100
300
500
34
22
R422A
100
300
500
35
23
R422D
100
300
500
36
24
25
-
R427A
100
300
500
37
Ammonia/NH3/R-717
50
150
300
-
Recommended Alarm Levels
48
Instruction 3015-5074
Gas Monitor – Multi Zone
Appendix B
RS-485 Communication Protocol
Overview
The following instructions are intended as a guide for integrating the MZ network into a Building Management
System. If you are unfamiliar with complex systems of this type, it is recommended that you contact Bacharach
for technical assistance.
MODBUS RTU Protocol
The MZ monitor communicates with master devices (such as the Remote Display or a Building Management
System) over the RS-485 serial interface. Because the monitor is configured with a two wire RS-485 serial bus,
data transmission occurs in ‘half-duplex” mode. Therefore, only one device may be in transmit mode at any
given time.
Programmers should refer to the “MODBUS Protocol Reference Guide” for details and more comprehensive
instructions. The guide is available on the Modicon web site at: www.global-download.schneiderelectric.com/852575620060EF70/All/852566B70073220C85256752006EA537/$File/pi_mbus_300.pdf
Specific communication software is available at: http://www.MyBacharach.com/downloads.htm
Instruction 3015-5074
49
Gas Monitor – Multi Zone
MZ MODBUS RTU Operation
Overview
The MZ and RD are equipped to communicate with other equipment using the MODBUS RTU protocol. Using
this communication channel a MODBUS master device may communicate with up to 15 MZ monitors on a
communications network, exchanging measurement information, alarm data, fault data, history (logs and trends)
and setup information. Additionally, the MODBUS master can control the operating state of an MZ monitor,
placing the MZ in any of its different operating modes. The network may be configured so that the MZ monitors
are connected directly to the MODBUS master device, or the MODBUS master device may communicate with
the MZs through the RD.
(NOTE: This document was written with the assumption that the reader is familiar with the various setup
parameters and operational modes for the Multi-Zone.)
Protocol Details
A 2 wire RS-485 bus is used for transmission, therefore communication occurs in a Half-Duplex mode. The MZ
is a slave device and will respond to queries in the MODBUS RTU format from a master device.
Two MODBUS functions are supported. They are function 03 (read holding register) and function 16 (Preset
Multiple registers). Please refer to the MODBUS Protocol Reference Guide (available at
www.modicon.com/techpubs/techPubNew/PI_MBUS_300.pdf) for protocol detail and use instructions.
Using the two MODBUS functions, a master device may read, modify and write data and status information to
any monitor on the network. Data is organized into structures (internal to the MZ monitor) which can be
accessed by the MODBUS registers defined in this document. A corresponding set of data structures should be
maintained by the master device. These master device data structures become the destination for responses to
read queries and sources for preset register commands. When a read holding register query is made by the
master device the MZ monitor responds by sending the contents of the structure referenced by the specified
register. After the master validates the MZ response using the CRC bytes, it must then move the data into its
matching data structure before individual items may be accessed or modified. Therefore, the master data
structure should correspond to the MZ data structure byte for byte. Note that some data structures have been
divided into multiple registers due to MODBUS RTU message length constrains. To change a setting in the MZ
monitor, the master device first reads the register structure that contains the data item to be modified, makes the
desired change, then sends the structure back using the preset multiple register function. If the transaction is
successful, the MZ monitor sends the appropriate MODBUS response. It is the responsibility of the master
device, when making modifications, to insure that all parameters transferred are within the working limits of the
MZ.
MZ Monitor Polling
After the MZ monitors are setup and operating, the master device need only poll each monitor for its status
register which contains summary data of the monitors’ alarms, faults, and operating state. If exceptions are
detected through the status register and more details are required, additional registers can be examined. Also if
current PPM values are required, the PPM register provides access to current PPM values for all zones. The
MZ monitor requires a minimum of 20 seconds to complete a gas concentration measurement for a single zone.
Therefore, it is not necessary to poll the MZ monitor more frequently than once every 15-20 seconds, as there
will not be any new data available/obtained by more frequent polling. In fact, excessive polling will slow the
operation of the MZ. Under no circumstances should the MZ monitor be continuously polled at rate faster than
500mS, as this could result in erroneous readings by the MZ monitor.
Network Topologies
MZ monitors may be connected directly to the MODBUS network or they may be connected to the network
through a Remote Display. In either case, each MZ monitor must have a unique node ID. Up to 15 MZ monitors
can be connected directly to the MODBUS network.
If MZ monitors are accessed via an RD connected to a MODBUS network, the RD “BMS enabled” parameter
must be set equal to “1” via the “RDM SETUP” screen on the Remote Display. The same commands and
registers are used to communicate with the MZ directly or through the RD. If the communications are through
the RD, it monitors each MODBUS message to determine if the message is intended for one of the MZ monitors
50
Instruction 3015-5074
Gas Monitor – Multi Zone
it is connected to. If it is, the RD passes the message through to the MZ monitors. If it is not, the message is not
passed through. The RD does not make any modifications to MODBUS messages. It simply passes the query
through to the MZ monitor, and passes the response back to the MODBUS master. In other words, it allows the
MZ monitors to be logically connected to the MODBUS network, when physically they are connected to the local
RD network. It is very important to understand that the RD will only pass messages through to the MZ monitor
when the RD is either in the “SYSTEM” screen or the “ZONE VIEW” screen. If the RD is in any other screen, it
will return a MODBUS “busy” exception response (exception code 06).
All RD screens, except the SYSTEM and ZONE VIEW screens, have a 10 minute timeout interval. After this, the
screen will return to the SYSTEM or ZONE VIEW screen, depending on which one was last displayed. The RD
may also be password protected so that a password entry is required in order to view screens other than the
SYSTEM or ZONE VIEW screen.
Key Comm Protocol Parameters
MODBUS Mode: RTU only
MZ Baud Rate:
Default is 19,200. Programmable as defined in System data register
Parity:
No Parity
Stop Bits:
Default is 1. Can be set for 2 via System data register
Maximum Response Time:
4000mS when directly accessing the MZ monitor
8,000mS when accessing the MZ monitor through the RD.
Error Checking:
CRC per MODBUS specifications
NOTE: All data sent out from the MZ is in “little endian” byte order (Least significant byte followed by most
significant byte). This should be taken into account if the master that process the data is a “big endian” type.
Non-data information (starting address, number of points, etc.) follows normal MODBUS protocol, which is Big
Endian.
Instruction 3015-5074
51
Gas Monitor – Multi Zone
Summary of Registers
Register Name
Number
HEX
Decimal
Description
System Data
0x0010
16
R/W
System Setup Data
Status
0x0011
17
R/W
Operating summary of faults, alarms and status
Zone Data
0x12xx
4609 4630
R/W
Setup data for up to 16 zones (xx defines zone number)
CAL Data
0x0014
20
R/W
Cal Factors for all gases
Date/Time
0x0015
21
R/W
Set MZ date & time
Sensor Data
0x0016
22
R
Raw measurement of sensors
Rel. Hold
0x0017
23
W
Release MZ out of hold mode
Hold Zone
0x0018
24
W
Put MZ into hold mode
Fault Log
0x19xx
6400
6401
R
20 most recent fault events (xx = 00 or 01)
Flow Log
0x001F
31
R
20 most recent flow fault events
Alarm Log
0x1Axx
6656
6657
6658
R
20 most recent alarm events (xx = 00, 01, or 02)
Serv. Mode
0x001B
27
W
Puts MZ into service mode
Rel Serv.
0x001C
28
W
Release MZ from service mode
PPM
0x001E
30
R
PPM values for all zones
Zone Log
0x3yxx
0-6
Trend data for each MZ zone [y = zone number (starting at 0),
xx = 00 – 06] Data
Data Type Abbreviations
C
Character
Float
Floating Point
I
Integer
TIM
Time
UI
Unsigned Integer
52
Instruction 3015-5074
Gas Monitor – Multi Zone
System Data Register
Register 0x0010hex
Variable
Type
Length
Description
Type
UI
2 bytes
Indicates EEPPROM has been initialized if value = 300 DO NOT
MODIFY
REV
Float
4 bytes
Firmware Rev Level DO NOT MODIFY
SN
UI
2 bytes
Firmware Serial Number DO NOT MODIFY
Node
UC
1 byte
Network Slave Node # (valid values are 1-15). The default is that
indicated by the Node DIP Switch on main board.
Location
C
13 bytes
Array defining text name of unit
Stop_Bits
C
1 byte
Number of stop bits used in the MZ data stream. Default = 1. Other
available value is 2
Aud_Alarm
UC
1 byte
Sounds internal board buzzer on condition; 0 = no buzzer; 1= Alarm;
2=Fault; 3=Leak; 4=Spill; 5=Evacuate; 6=Monitor Off line (DEFAULT = 0)
Alarm_Ack_
UC
1 byte
Defines Alarm Operation. Manual Acknowledge = 0; Auto Acknowledge
= 1 (DEFAULT = 0)
Num_Zones
UC
1 byte
Number of install zones (Value initialized during auto detect during
Power On Self Test).
UNUSED
TIM
13 bytes
UNUSED
Rezero_Mode
UC
1 byte
Defines rezero mode. Auto Rezero = 0; Rezero every zone = 1
(DEFAULT = 0)
Hold_Time
UI
2 byte
Length of zone hold interval in minutes (DEFAULT = 15 minutes)
Det_Limit
UC
1 byte
Minimum detection limit (in PPM). Concentrations less than or equal this
value will read as 0 PPM (DEFUALT = 0 PPM)
Avg_Size
UC
1 byte
Size of running average used in computing PPM value. DO NOT
MODIFY.
Loop2_factor
Float
4 bytes
Defines PPM current loop output. (DEFAULT = 0.16mA/PPM)
Serv_Mode_TO
UI
2 bytes
Service Mode Timeout value (in minutes). (DEFAULT = 60 MINUTES)
RS485_BAUD
UI
2 bytes
BAUD RATE for RS-485 connection (between RD and MZ monitor or
MODBUS master and MZ depending on the Network topology).
Default=9 (19.2K); other values are 8=9600, 7=4800
UNUSED
UI
2 bytes
UNUSED
Mode
Instruction 3015-5074
16dec
R/W
54 bytes
53
Gas Monitor – Multi Zone
Status Register
Register 0x0011hex
17dec
R/W
10 bytes
Variable
Type
Length
Description
Mode
UC
1 byte
Defines Operating Mode of MZ. 0 = normal Mode; 1 = Zone_Hold
Mode; 2 = Diagnostic Mode; 3 = Service mode. DO NOT MODIFY (use
zone hold register or service mode register to change this
parameter)
State
UC
1 byte
Defines MZ Current State. 0 = Idle; 1 = Sampling; 2 = Zeroing; 3 =
Warm Up, 4 = Pressure Check DO NOT MODIFY
Measuring
UC
1 byte
Value = 1 if unit is acquiring detector signal for running avg. DO NOT
MODIFY
Active_Zone
UC
1 byte
Current Zone being checked. 0=zone1, 1=zone2, etc.
Max _Alarm
UC
1 byte
Indicates highest non-acknowledged alarm level DO NOT MODIFY
Alarm_Count
UC
1 byte
Number of alarms that are currently active. DO NOT MODIFY
UNUSED
UC
1 byte
UNUSED
Loop_Card
UC
1 byte
Value = 1 if 4-20mA card has been detected. DO NOT MODIFY
Fault
UI
2 bytes
See Note Below
Fault Flag Structure uses bitwise access to 16 bit word as defined below:
Fault Code Table
BIT
Fault Type
Code
Description
15
CLIPPING FAULT
0x8000
0x8000 Sensor output voltage too high
14
ZERO RANGE FAULT
0x4000
Sensor output voltage outside limits during purge
13
OVER RANGE FAULT
0x2000
Gas concentration above measurable range
12
PURGE FLOW FAULT
0x1000
No flow detected during purge cycle
11
ZONE FLOW FAULT
0x0800
No flow detected during sample cycle
10
A2D FAULT
0x0400
Analog to digital converter not working
9
GAIN SET FAULT
0x0200
Digipot gain setting out of normal range
8
ZERO FILTER FAULT
0x0100
Charcoal filter (if used) needs replacement
7
CONFIG FAULT
0x0080
No zones are enabled
6
UNUSED FAULT 2
0x0040
5
UNUSED FAULT1
0x0020
4
LOOP FAULT
0x0010
Current loop is open
3
RS485 FAULT
0x0008
Communication error
2
MANIFOLD P FAULT
0x0004
Pressure sensor readings are out of range
1
BENCH T FAULT
0x0002
Sensor temperature is out of range
0
BOX T FAULT
0x0001
Chassis temperature is out of range
54
Instruction 3015-5074
Gas Monitor – Multi Zone
Zone Data
Register 0x12xxh R/W
78 bytes
Each zone for an MZ has a separate Zone data structure that is 78 bytes long. The zone number is the low
order byte in the register address (i.e., Zone 1 data register = 0x1201h)
Variable
Type
Length
Description
Location
C
13 bytes
13 byte array, Alpha Numeric Description or Name of Zone
Flow OK
UC
1 byte
Status of Flow check. Value of 1 indicates flow check is good. DO
NOT MODIFY
Refrigerant Type
UC
1 byte
See note 1 Below (DEFAULT = R134a)
Distance
UI
2 bytes
Zone Tubing Length (in feet) (DEFAULT = 100 feet)
Zone Temp
I
2 bytes
Avg temp at zone (degrees C) (DEFAULT = 25°C)
Concentration
Float
4 bytes
Last Measured concentrations (uM/L) DO NOT MODIFY
Concentration2
Float
4 bytes
Last Measured concentration (PPM) DO NOT MODIFY
Alarm Ack
UC
1 bytes
Set value to 1 to acknowledge Alarm. NOTE: MZ will reset this byte to
0 when the Alarm byte (below) is = 0 and zone in alarm is sampled. If
the alarm condition/byte increases (leak>>spill or spill>>evac) the MZ
will also reset this byte to 0
Alarm
UC
1 bytes
Alarm Status; 0 = no alarm, 1 = leak; 2 = spill; 3 = evac.
Leak Level
UI
2 bytes
Level to trigger a leak alarm (in PPM) (DEFAULT = 100)
Spill Level
UI
2 bytes
Level to trigger a spill alarm (in PPM) (DEFAULT = 300)
Evac Level
UI
2 bytes
Level to trigger a evacuate alarm (in PPM) (DEFAULT = 500)
Peak PPM
UI
2 bytes
Highest Recorded PPM in zone
Peak Time
TIM
13 bytes
Date an time of highest peak (see note 2 for format)
Alarm Time
TIM
13 bytes
Date and time of last alarm (see note 2 for format)
Not Used
Log Interval
13 bytes
UI
2 bytes
Number of minutes between Log entries (DEFAULT = 1440)
NOTE 1: Refer to the Recommended Alarm Settings & Gas Enumeration table on page 47.
NOTE 2: Time Structure Format consists of 13 unsigned character types. They are 1 second digit, 10 second
digit, 1 minute digit, 10 minute digit, 1 hour digit, 10 hour digit, 1 day digit, 10 day digit, 1 month digit, 10 month
digit, 1 year digit, 10 year digit, last byte is unused.
Instruction 3015-5074
55
Gas Monitor – Multi Zone
Alarms & Alarm Acknowledge
The Multi-Zone can be operated in two different alarm acknowledge modes, Auto and Manual (set via the
alarm_ack_mode variable in the system data register). For purposes of this discussion, the term “Alarm” refers
to an MZ state where the alarm light is on and the appropriate alarm relay is activated. The term “Alarm
condition” refers to the external condition (i.e., refrigerant leak) that initially causes the MZ monitor to go into an
alarm. If an alarm occurs it can be handled in one of 3 ways.
1. Non-Latching Mode. This mode is enabled by setting the AUTO_ACK_MODE parameter in the system
register to “1”. In this mode, if an alarm condition occurs an MZ alarm will be created. If the alarm
condition is subsequently removed, the MZ alarm will automatically be cleared by the MZ monitor when
the zone in alarm is sampled “clear”. Note, in this mode of operation, it is possible for an alarm to occur
and be cleared without user or MODBUS master intervention. If this is the case, the only evidence of the
alarm would be contained in the MZ alarm log.
2. Latching Mode with Silence. This mode is enabled by setting the AUTO_ACK_MODE in the system
register to “0”. In this mode, if an alarm condition occurs, an MZ alarm will be created. In order for the
alarm to be removed the MODBUS master will write a “0” to the ALARM parameter in the ZONE register.
This will cause the alarm to be “silenced” in the MZ monitor (i.e., the alarm relays will return to their normal
state and the ALARM lamp will be extinguished). The next time the zone with the alarm condition is
sampled, if the alarm condition still exists, the alarm will be reactivated and the alarm parameter will be
reset to “1” in the MZ. Otherwise, if the alarm condition has cleared, no further action is required and
normal operation will resume.
3. Latching Mode without Silence. This mode is enabled by setting the AUTO_ACK_MODE in the system
register to “0”. In this mode, if an alarm condition occurs, an MZ alarm will be created. The MZ MODBUS
master will then write a “1” to the ALARM ACK parameter in the zone register. The alarm will continue to
persists (i.e., Relays in alarm state and Alarm light on) until the offending zone is sampled and no alarm
condition is detected. At that point, the ALARM ACK parameter is automatically cleared by the MZ
monitor, as is the ALARM parameter. NOTE: If the ALARM ACK parameter is set to “1” and the ALARM
CONDITION is upgraded (from leak to spill, or spill to evacuate) the ALARM ACK parameter will
automatically be cleared to “0” by the MZ.
56
Instruction 3015-5074
Gas Monitor – Multi Zone
Date Time Register
Register 0x0015h 21dec R/W 14 bytes
Variable
Type
Length
Description
Date_Time
Time
14 bytes
Contains current time and date. Structure is defined as in
note 2 of zone data
Time Structure Format consists of 14 unsigned character types. They are 1 second digit, 10 second digit, 1
minute digit, 10 minute digit, 1 hour digit, 10 hour digit, a day digit, 10 day digit, 1 month digit, 10 month digit, 1
year digit, 10 year digit, day of the week, last byte is unused.
Sensor Data Register
Register 0x0016h 22dec
R
82 bytes
Variable
Type
Length
Description
Pressure
Float
4
Manifold Pressure is PSIA
P_Volts
Float
4
Pressure sensor output Voltage
Vacuum_P
Float
4
Pressure with all value closed and pump on in PSIA
Ambient_P
Float
4
Absolute Ambient Pressure in PSIA
Box_T
Float
4
Enclosure Temperature in Degrees C
Box_T_Volts
Float
4
Box temp sensor output voltage
Bench_T
Float
4
Optical bench temperature in Degrees C
Bench_T_Volts
Float
4
Bench temp sensor output voltage
Bench_Z_T
Float
4
Optical bench temp in degrees C at last zero interval
Box_Z_T
Float
4
Box temp in degrees C at last zeroing
PkPk_int
UI
2
Current peak to peak A/D counts from detector
PkPk
Float
4
Current peak to peak voltage from detector
Ave_PkPk
Float
4
Running average voltage from detector
Zero_PkPk
Float
4
Voltage measured at last zeroing
Noise
Float
4
Largest Change in running average
AU
Float
4
Current absorbance value
Ave_AU
Float
4
Running Average of absorbance level
Bench_PPM
Float
4
PPM in bench based on zone gas selection (uncorrected
for pressure and temperature)
STP_PPM
Float
4
PPM corrected to STP (1 atm, 25 deg C)
Bench_UML
Float
4
Micromoles/liter in bench (uncorrected0
Ambient_UML
Float
4
Micromoles/liter corrected to ambient pressure
Instruction 3015-5074
57
Gas Monitor – Multi Zone
Release Zone Hold Register
Register 0x0017h 23dec W
Variable
Type
Length
Description
Rel_Hold
*
*
See description of STATUS REGISTER
Hold Zone Register
Register 0x0018h 24dec W
Variable
Type
Length
Description
Zone_Hold
*
*
See description of STATUS REGISTER
10 bytes
10 bytes
MZ Hold Mode
The MZ monitor can be made to hold or “dwell” on a particular zone if necessary. The length of the hold time is
defined by the HOLD TIME parameter in the System Data Register.
Placing the MZ Monitor into hold mode:
1. Read the MZ Status Register (0x0011h)
2. Modify the content of the status register structure to change the MODE parameter to zone hold mode.
Active zone parameter to the zone you wish to hold
3. Send this updated status register structure back to the MZ using PRESET MULTIPLE REGISTER
COMMAND to the HOLD ZONE REGISTER (0x0018h).
Releasing the Zone hold:
1. Read the MZ monitor Status Register (0x0011h)
2. Modify the content of the status register to change the MODE parameter to normal mode. Active zone
parameter to the zone which you would like to resume normal activity on
3. Send this updated status register structure back to the MZ using PRESET MULTIPLE REGISTER
COMMAND to the RELEASE HOLD REGISTER (0x0017h).
58
Instruction 3015-5074
Gas Monitor – Multi Zone
Fault Log Register
Register 0x1900, 0x1901h 6400, 6401dec R 302 bytes
These registers contain the 20 most recent fault events, the time they occurred, and a pointer to the most recent
event. The data is split into 2 registers. The first register contains 200 bytes and the second register contains
102 bytes. The results of these two register reads should be recombined into the Fault Log Data Structure after
both have been received
Variable
Type
Length
Description
Fault
UI
40 bytes
20 most recent fault events. Each event is decoded as
indicated in Fault Flag Structure given after the Status
Register Description
Time
TIM
260 bytes
Time of each fault occurrence. TIM value as defined in
NOTE 2 of Zone Data
Ptr
UC
1 byte
Pointer to most recent event
Unused
UC
1 byte
Flow Log Register
Register 0x001F
31dec R
142 bytes
Variable
Type
Length
Description
Flow Event
UI
40 bytes
20 most recent flow fault events. Each bit of the unsigned
int represents a zone and a 1 indicates no flow. Zero
indicates flow.
Purge Flow Event
UC
20 bytes
20 most recent flow fault events where a 1 indicates no
flow. Zero indicates flow.
Time
UC
80 bytes
Time/date stamps for 20 most recent logged flow events.
This variable is an unsigned long integer formatted as
seconds since Jan 1 of 1980
Ptr
UC
1 byte
Pointer to most recent event
Unused
UC
1 byte
Unused
Alarm Log Register Register 0x1A00h, 0x1A01h, 0x1A02h (6656, 6657, 6657dec)
582 bytes
These registers contain the 20 most recent alarm events, the time they occurred, and a pointer to the most
recent event. The data is split into 3 registers and should be recombined into an appropriate structure after all
three registers have been received. Register 0x1A00h contain 200 bytes, Register 0x1A01h contains 200 bytes,
and register 0x1A02h contains 181 bytes.
Variable
Type
Length
Description
Event
UC
320 bytes
20 most recent alarm events. Each event contains 1 byte
for each zone. Each zone Byte is defined as 0=No Alarm,
1=Leak Alarm, 2=Spill Alarm, 3=Evac Alarm.
Time
TIM
260 bytes
Time of each alarm event. TIM value as defined in NOTE 2
of Zone Data
Ptr
UC
1 byte
Pointer to most recent event
Unused
UC
1 byte
Service Mode Register
Register 0x001B/hex
27dec
W 10 bytes
Variable
Type
Length
Description
Rel_Svc_Mode
*
*
See description of STATUS REGISTER
Instruction 3015-5074
59
R
Gas Monitor – Multi Zone
Release Service Mode Register
Register 0x001Chex
28dec W 10 bytes
Variable
Type
Length
Description
Ent Svc_Mode
*
*
See description of STATUS REGISTER
MZ Service Mode
The MZ monitor can be placed into service mode if necessary. During service mode the unit will take no
measurements, any and all alarms are silenced, and all relays are opened. The unit automatically comes out of
service mode after a preset interval defined by the service_mode_TO parameter in the System Data Register.
Placing the unit into Service Mode:
1. Read the MZ Status Register (0x0011h)
2. Modify the content of the status register structure to change the MODE parameter to service mode.
3. Send this updated status register structure back to the MZ unit using PRESET MULTIPLE REGISTER
COMMAND to the SERVICE MODE REGISTER (0x001Bh).
Releasing the unit from Service Mode:
1. Read the MZ Status Register (0x0011h)
2. Modify the content of the status register to change the MODE parameter to normal mode.
3. Send this updated status register structure back to the MZ unit using PRESET MULTIPLE REGISTER
COMMAND to the RELEASE SERVICE MODE REGISTER (0x001Ch).
PPM Register
Register 0x001Ehex
30dec R
32 bytes
Variable
Type
Length
Description
PPM
UI
32 bytes
16 Unsigned Integers that represent the PPM values for
each MZ monitor zone
NOTE: 16 values are returned independent of the number of actual zones installed in the unit. The master
device is required to know how many zones are installed in the unit (available in the System Register) in order to
properly interpret the data.
Zone Log Registers
Register 0x3xyyh R
1502 bytes
These registers are used to transfer the zone log data. Each zone has a circular log of 100 past data points.
The period between data points is defined by the Log Interval parameter in each corresponding Zone Data
Register. The data for each zone is defined by the “x” place in the above register address. For zone 1 the
Register address is 0x30yyh, for zone 2 the register address is 0x31yyh, etc. The data for each zone is sent in 8
consecutive registers due to MODBUS RTU message length constrains. The addresses are defined by the “yy”
place in the above address. For zone 1, all log data can be obtained by reading 0x3000h, 0x3001h, 0x3002h,
…… , 0x3007h. The first seven registers contain 200 bytes each and the last register contains 102 bytes. After
all registers have been received the data should be reassembled into the full data structure.
Variable
Type
Length
Description
Index
UI
2
Point to current reading
Time
TIM
1300
Time record for each of the 100 log points. The format for
the TIM type is defined in note 2 of zone data
PPM
UI
200
Last 100 log points (2 byes per point)
60
Instruction 3015-5074
Gas Monitor – Multi Zone
MODBUS Exception Responses
The following MODBUS exception responses are supported by the unit:
01
Illegal Function
02
Illegal Data Address
06
Slave Device Busy (Occurs only when MZ is connected to the bus through an RD and the RD is not
in the SYSTEM or ZONE VIEW screen)
Instruction 3015-5074
61
Gas Monitor – Multi Zone
Appendix C
62
Instruction 3015-5074
Gas Monitor – Multi Zone
Instruction 3015-5074
63
Gas Monitor – Multi Zone
NOTES:
64
Instruction 3015-5074
Headquarters:
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Website: www.MyBacharach.com • E-mail: [email protected]
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