Bacharach | MultiZone | Specifications | Bacharach MultiZone Specifications

Ammonia Gas Monitor – Multi Zone
AGM-MZ
Ammonia Gas Monitor – Multi Zone
Instruction 3015-5113
Installation / Operation / Maintenance
Rev. 2 - June 2010
UL 61010-1
CAN/CSA 22.2 No.61010.1
Product Leadership • Training • Service • Reliability
Ammonia 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: AGM-MZ (Ammonia Gas Monitor)
European EMC Directive 2004/108/EC
EN55011 – Emissions Product Specific Standard
EN61326-1 – Immunity Product Specific Standard
EN61010-1 – Safety requirements for Electrical Equipment
For Measurement, Control, and Laboratory
Use-Part 1: General Requirements
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 © 2000–2009, 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.
A
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
Table of Contents
1 INTRODUCTION .......................................................................................................................................... 5
About This Manual ....................................................................................................................................... 5
Warning Statements................................................................................................................................. 5
Caution Statements.................................................................................................................................. 5
Hazard Symbols on Monitor..................................................................................................................... 5
Safety Precautions....................................................................................................................................... 6
AC Power Supply ..................................................................................................................................... 6
Protective Grounding................................................................................................................................ 6
Explosive Atmosphere.............................................................................................................................. 6
Proper Exhaust Venting ........................................................................................................................... 6
Accessing the Interior of the Monitor........................................................................................................ 6
Misuse & Modifications to the Instrument ................................................................................................ 6
In Case of Malfunction.............................................................................................................................. 6
Fusing....................................................................................................................................................... 6
Installation Category................................................................................................................................. 6
Altitude Limit............................................................................................................................................. 6
Cleaning ................................................................................................................................................... 6
Functional Overview .................................................................................................................................... 7
General Description.................................................................................................................................. 7
Communication Options ........................................................................................................................... 7
Understanding Monitoring Levels............................................................................................................. 7
Suggested Location of Sampling Points .................................................................................................. 7
2 INSTALLATION ........................................................................................................................................... 9
Installation Considerations......................................................................................................................... 10
Warnings & Cautions.............................................................................................................................. 10
Inspection ............................................................................................................................................... 10
Location of the Monitor........................................................................................................................... 10
Mounting Instructions ............................................................................................................................. 11
Connecting Air Lines.................................................................................................................................. 12
Overview ................................................................................................................................................ 12
Tubing Considerations ........................................................................................................................... 12
Connecting Purge Line........................................................................................................................... 12
Connecting Exhaust Line ....................................................................................................................... 12
Connecting Sample Intake Lines ........................................................................................................... 12
Interior Schematics .................................................................................................................................... 14
Electrical Wiring ......................................................................................................................................... 16
Connecting Communication Devices......................................................................................................... 17
Remote Display Module (AGM-RD) Connection.................................................................................... 17
Integrating with Building Management Systems .................................................................................... 17
Larger Integrated Systems..................................................................................................................... 17
Changing Terminator Switch Settings.................................................................................................... 18
Personal Computer ................................................................................................................................ 18
Multiple AGMs............................................................................................................................................ 19
Connecting to a Building Management System......................................................................................... 19
PC Software............................................................................................................................................... 20
Saving & Sending Programs .................................................................................................................. 21
Trend Data ............................................................................................................................................. 21
Converting the TREND Text File to a Microsoft Excel File .................................................................... 21
Saving & Printing the AGM-MZ Software Screen, Alarm Log, Fault Log, or Diagnostic Screen .......... 21
USB Type Laptops ................................................................................................................................. 21
Current Loop Interfaces ............................................................................................................................. 22
Optional 4–20 mAdc Outputs ................................................................................................................. 22
Connection ............................................................................................................................................. 22
Connecting External Alarms ...................................................................................................................... 23
Overview ................................................................................................................................................ 23
Connection ............................................................................................................................................. 23
Instruction 3015-5113
1
Ammonia Gas Monitor – Multi Zone
3 SETUP PROGRAMMING ...........................................................................................................................25
Display Screens..........................................................................................................................................25
Initial Power Up ...................................................................................................................................... 25
Data Display Screen .............................................................................................................................. 25
Navigating to the 1st Setup Screen ........................................................................................................ 25
Navigating to the 2nd Setup Screen........................................................................................................ 26
Location.................................................................................................................................................. 26
Number of Zones Installed ..................................................................................................................... 26
Alarm Ack Mode..................................................................................................................................... 26
Audible Alarm......................................................................................................................................... 27
Zone Hold Mode..................................................................................................................................... 27
Zone Hold Time...................................................................................................................................... 27
Detection Limit ....................................................................................................................................... 27
Loop2 Factor .......................................................................................................................................... 27
Re-Zero Mode ........................................................................................................................................ 27
Navigating to the 3rd Setup Screen ........................................................................................................ 28
4 GENERAL OPERATION ............................................................................................................................30
Functional Overview ...................................................................................................................................30
The Zone Screen ........................................................................................................................................30
Leak Level.............................................................................................................................................. 32
Spill Level ............................................................................................................................................... 32
Evacuation Level.................................................................................................................................... 32
Re-Setting the Peak PPM Value............................................................................................................ 32
Alarm Conditions ................................................................................................................................ 32
Fault Conditions.................................................................................................................................. 32
Alarms ................................................................................................................................................ 32
Functional Overview............................................................................................................................... 32
Responding to Alarms............................................................................................................................ 33
Alarm Detail Screen ............................................................................................................................... 33
Acknowledging Alarms........................................................................................................................... 34
Silencing an Alarm ................................................................................................................................. 34
System Faults..................................................................................................................................... 34
Functional Overview............................................................................................................................... 34
Navigating to the Fault Screen............................................................................................................... 35
Critical Faults ......................................................................................................................................... 35
Non Critical Faults.................................................................................................................................. 36
Reset to Factory Default Settings .......................................................................................................... 36
Clearing System Faults .......................................................................................................................... 36
Viewing Fault Log................................................................................................................................... 37
Viewing Flow Log ................................................................................................................................... 37
The Trend Screen.......................................................................................................................................38
Navigating to the Trend Screen ............................................................................................................. 38
The Calibration Screen ...............................................................................................................................38
Navigating to the Calibration Screen ..................................................................................................... 39
Adjusting Calibration Factor ................................................................................................................... 39
Calibration Procedure ............................................................................................................................ 39
Programming New Gasses .................................................................................................................... 40
The Diagnostic Screen ...............................................................................................................................41
Navigating to the Diagnostic Screen...................................................................................................... 41
Diagnostic Screen Overview .................................................................................................................. 41
Service Mode ......................................................................................................................................... 42
5 MAINTENANCE..........................................................................................................................................43
Hydrophobic Filter .................................................................................................................................. 43
Servicing Air Lines & Replacing Termination Filters.............................................................................. 43
Fuses...................................................................................................................................................... 43
Clock Battery.......................................................................................................................................... 43
Sample Pump......................................................................................................................................... 43
Intake Manifolds ..................................................................................................................................... 43
2
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
4–20 mAdc Interface Board ................................................................................................................... 44
Replacement Parts & Optional Accessories .............................................................................................. 44
Replacement Parts................................................................................................................................. 44
Item Description ..................................................................................................................................... 44
Part Number ........................................................................................................................................... 44
Item Description ..................................................................................................................................... 44
Part Number ........................................................................................................................................... 44
Surge Protectors: ................................................................................................................................... 44
Specifications............................................................................................................................................. 45
APPENDIX A................................................................................................................................................. 46
Recommended Alarm Settings & Gas Enumeration.............................................................................. 46
APPENDIX B................................................................................................................................................. 47
RS-485 Communication Protocol .............................................................................................................. 47
Overview ................................................................................................................................................ 47
MODBUS RTU Protocol ......................................................................................................................... 47
AGM-MZ MODBUS RTU Operation .......................................................................................................... 48
Overview ................................................................................................................................................ 48
Protocol Details ...................................................................................................................................... 48
AGM-MZ Polling ..................................................................................................................................... 48
Network Topologies................................................................................................................................ 48
Key Comm Protocol Parameters............................................................................................................ 49
Summary of Registers............................................................................................................................ 50
System Data Register ............................................................................................................................ 51
Status Register ..................................................................................................................................... 52
Fault Code Table.................................................................................................................................... 52
Zone Data .......................................................................................................................................... 53
Alarms & Alarm Acknowledge................................................................................................................ 53
Date Time Register ............................................................................................................................... 55
Sensor Data Register ............................................................................................................................ 55
Release Zone Hold Register .............................................................................................. 56
Hold Zone Register ............................................................................................................................... 56
AGM-MZ Hold Mode .............................................................................................................................. 56
Releasing the Zone hold: ....................................................................................................................... 56
Fault Log Register ................................................................................................................................ 57
Flow Log Register ................................................................................................................................ 57
Alarm Log Register ............................................................................................................................... 57
Service Mode Register .......................................................................................................................... 57
Release Service Mode…….... .. ............................................................................................................ 58
AGM-MZ Service Mode.......................................................................................................................... 58
Releasing the unit from Service Mode: .................................................................................................. 58
PPM Register ....................................................................................................................................... 58
Zone Log Registers ............................................................................................................................... 58
MODBUS Exception Responses............................................................................................................ 59
APPENDIX C................................................................................................................................................. 60
Instruction 3015-5113
3
Ammonia Gas Monitor – Multi Zone
This page intentionally left blank.
4
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
1 Introduction
About This Manual
Thank you for investing in a Bacharach AGM-MZ Ammonia Gas Monitor.
To assure operator safety and the proper use of the AGM-MZ 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 gas monitors, 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 AGM-MZ
Ammonia Monitor and AGM-RD Display Module.
Warning Statements
The use of the word WARNING in this manual denotes a potential hazard associated with the use of this
equipment. It calls attention to a procedure, practice, or condition, or the like, which if not correctly performed
or adhered to, could result in personal injury or death.
Caution Statements
The use of the word CAUTION in this manual denotes 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 damage to the equipment.
Hazard Symbols on Monitor
This symbol indicates the need to consult this operating instruction manual when opening the
enclosure.
WARNING: A potential risk exists if the operating instructions are not followed.
This symbol indicates the presence of electric shock hazards when the enclosure is opened.
WARNING: To avoid risk of injury from electric shock, do not open the enclosure without first disconnecting
AC power.
Instruction 3015-5113
5
Ammonia Gas Monitor – Multi Zone
Safety Precautions
AC Power Supply
The AGM-MZ 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 AGM-MZ 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.
6
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
Functional Overview
General Description
Ammonia gas monitors are specified to support compliance to federal, state and local safety codes governing
emissions. Avoiding significant gas loss reduces equipment replacement costs, maintains equipment
efficiency, promotes safety, and protects the environment.
The Bacharach AGM-MZ provides continuous monitoring of ammonia gas levels in up to 16 separate test
zones. The instrument is easily programmed to monitor independent leaks (small), spills (medium), and
evacuations (large) levels that 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 AGM-MZ 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 AGM-MZ 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 AGM-MZ 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 ammonia gas that is monitored. Allowable exposure levels and threshold limit values in are measured 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 15-1994 and ASHRAE Safety Code 34-1992. 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.
Suggested Location of Sampling Points
At the point of an ammonia leak the gas is nearly pure. As the ammonia is dispersed into the air, the gas
molecules diffuse, causing a dilution of the original concentration. The AGM-MZ measures the ammonia gas
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.
It should also be noted that ammonia gas is half the density of air and tends to collect above the point of a
leak. A sample taken above the floor will have a greater concentration of gas than that collected below the
source of a leak. 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 close to the ceiling since ammonia is lighter than
air and rises.
. 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.
Instruction 3015-5113
7
Ammonia Gas Monitor – Multi Zone
The AGM-MZ 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
500ft. for any zone. The fresh air purge line should draw from an area that does not contain any ammonia
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.
AGM-MZ / AGM-RD Ammonia Gas leak Monitor Mechanical Room Placement
Auxiliary
Horn/Strobe
Fresh air purge
from area away
from ammonia
gas
Exhaust Fan
Sample Inlet
Pickup Point
Outside Hallway
AGM-RD
Remote Display
Module outside of
mechanical room
Machine Room
AGM-MZ
Chiller
Halogen
Gas
Monitor
Sample Inlet Pickup Points
The AGM-RD 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 AGM-RD can be
located up to 4500 feet from the AGM-MZ. The AGM-RD is the man machine interface by which you program
the AGM-MZ, acknowledge alarms and observe conditions inside of the mechanical room. Note that there
are two additional alarm relay contacts in the AGM-RD that can be programmed to alarm with “leak, spill,
evacuate, fault or monitor on”.
8
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
2 Installation
AGM-MZ 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)
 AGM-MZ Instruction Manual (P/N 3015-5113)
Instruction 3015-5113
9
Ammonia Gas Monitor – Multi Zone
Installation Considerations
Warnings & Cautions
WARNING: Explosion hazard! Do not mount the AGM-MZ 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 accessing the interior
of the monitor.
CAUTION: Drilling holes in the AGM-MZ enclosure may damage the unit and will void
the warranty. Please use the knockouts provided for electrical connections.
CAUTION: The AGM-MZ contains sensitive electronic components that can be easily
damaged. Do not touch nor disturb any of these components.
Inspection
The AGM-MZ 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 AGM-MZ should be centrally located in the facility and should be easily accessible for visual monitoring
and servicing. Intake sample lines can be up to 500 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 AGM-MZ. 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.
10
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
Mounting Instructions
The AGM-MZ should be installed plumb and level and securely fastened to a rigid mounting surface.
The enclosure utilizes keyhole mounting brackets designed for 1/4 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 1/4".
AGM-MZ Mounting Specifications
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.
Instruction 3015-5113
11
Ammonia Gas Monitor – Multi Zone
Connecting Air Lines
Overview
Individual sample lines are run from the AGM-MZ 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
AGM-MZ 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 3015-5111) 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 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 ammonia gas.
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.
Connecting Sample Intake Lines
The AGM-MZ 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 500 feet when no exhaust tubing is used. Otherwise, the combined length
of the sample line and the exhaust line cannot exceed 500 ft. 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 line-end filter (P/N 3015-3420) should be attached to the end of each sample intake line.
12
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
Line-end filters should be placed close to the ceiling since ammonia is half the density of air and therefore
rises.
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.
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.
Instruction 3015-5113
13
Ammonia 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.
14
Instruction 3015-5113
Ammonia 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)
Factory
Default
CPU Reset
Instruction 3015-5113
15
Ammonia Gas Monitor – Multi Zone
Electrical Wiring
The AGM-MZ 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 approved 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 AGM-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).
AGM-MZ AC Input Power and Ground Connections
16
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
Connecting Communication Devices
Remote Display Module (AGM-RD) Connection
The AGM-MZ is connected to the AGM-RD using a shielded twisted pair instrument cable. The maximum
distance between the farthest away AGM-MZ and AGM-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 AGM-MZ and AGM-RD must be connected in the following manner:
Locate the RS-485 connector in the AGM-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 AGM-RD (See this topic in the AGM-RD
manual 3015-5162). This connector is located on the bottom of the AGM-RD PC board, second from the
right. Make the wire run to the AGM-RD and connect the twisted shielded pair to the RS-485 “TO
MONITORS” connector using the same color code as used on the AGM-MZ.
Integrating with Building Management Systems
The AGM-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
AGM-MZ. 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 AGM-MZ to a Building Management System through an AGM-RD. In this case,
first connect the AGM-MZ to the AGM-RD as described above. Then, follow the instructions in the
Communications Connections section of the AGM-RD manual (3015-5162) for information on how to connect
the AGM-RD to a Building Management System.
RS-485 Connector
Instruction 3015-5113
GROUND
LEAD A
LEAD B
RS-485
17
Ammonia 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 AGM-MZ is connected as a single device, or if it is the last device on the network chain. If the AGM-MZ 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 AGM-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.bacharach-inc.com/downloads.htm
18
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
Multiple AGMs
TERMINATOR
“IN”
Multiple AGM-MZs With AGM-RD
NOTE 1: The last AGM-MZ or AGM-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.
AGM-RD
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 AGM-MZs
RS-485
NOTE: The terminators in the AGM-RD and AGM-MZ Unit 4 must be in the “IN” position.
The terminators in AGM-MZ units 1, 2 and 3 must be in the “OUT” position.
AGM-MZ
UNIT 1
NODE 1
AGM-MZ
UNIT 2
NODE 2
TERMINATOR
“OUT”
AGM-MZ
UNIT 3
NODE 3
AGM-MZ
UNIT 4
NODE 4
TERMINATOR
TERMINATOR
TERMINATOR
“OUT”
“OUT”
“IN”
Connecting to a Building Management System
The AGM-MZ may be connected to a Building Management System via the RS-485 connector. The node
address on each AGM-MZ 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 AGM-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 AGM-MZ network is connected directly to a Building Management System it may not be connected to
the AGM-RD. However, the AGM-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 AGM-RD port
while the downstream AGM-RD port talks to the AGM-MZs. In this case, the BMS is talking “through” the
AGM-RD to the AGM-MZs, but not physically on the AGM-MZ/AGM-RD network.
NOTE: If the AGM-MZ is not at the end of the line in a series connection, then the terminator on the AGM
must be set to “OUT.” Also, each end of the series must have the terminator set to “IN”.
Multiple AGM-MZs Connected to a Building Management System
TERMINATOR
“OUT”
BMS
AGM-MZ
NODE 1
AGM-MZ
NODE 2
AGM-MZ
NODE 3
AGM-MZ
NODE 4
TERMINATOR
TERMINATOR
TERMINATOR
TERMINATOR
“IN”
“OUT”
“OUT”
“IN”
Instruction 3015-5113
19
Ammonia Gas Monitor – Multi Zone
Multiple AGM-MZs Connected to a Building Management System
Daisy Chain Fashion
BUILDING
MANAGEMENT
SYSTEM
RS-485
TERMINATOR
“IN”
AGM-MZ
UNIT 1
NODE 1
TERMINATOR
“OUT”
AGM-MZ
UNIT 2
NODE 2
AGM-MZ
UNIT 3
NODE 3
TERMINATOR
TERMINATOR
TERMINATOR
“OUT”
“IN”
“OUT”
AGM-MZ
UNIT 4
NODE 4
PC Software
NOTE 1: The AGM-MZ is compatible with AGM300 PC software version 1.52 and higher. However,
calibration data can only be edited on the front panel of the AGM-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 AGM-MZ software is in use. Alternatively, COM2 may be used by adding a space
and the number 2 to the command line, c:\pc2AGM.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 AGM-MZ software
automatically configures COM1 to match the AGM-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 AGM-MZ and
the laptop. After both are operational, connect the RS-232 cable and start the software program.
1. Apply power to AGM-MZ and allow it to warm up.
2. Connect RS-232 interface cable to the PC and RS-232 port on the AGM-MZ.
3. Insert software disk into the PC.
4. Open the AGM-MZ software using Windows Explorer.
5. Upon start up, the program will immediately attempt to download data from the AGM-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 AGM LOCATION becomes highlighted.
Press Enter to move to the AGM 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.
20
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
7. Go to EDIT. From the EDIT Menu, select ZONES. Select a specific zone to identify and set
parameters. Make a selection from the gas library 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 AGM-MZ,
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 AGM-MZ, open the program and connect the PC to the AGM-MZ.
From the AGM, select SEND SETUP and press Enter. The saved program will be sent to the AGMMZ.
Trend Data
Creating a trend data file must be done while connected to the AGM-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 in the file
name for that 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 AGM-MZ Software Screen, Alarm Log,
Fault Log, or Diagnostic Screen
Open the software while connected to the AGM-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 RS-232 converter must be purchased
to provide an RS-232 output. We recommend the converter manufactured by:
SEALEVEL SYSTEMS, INC.
155 TECHNOLOGY PLACE
P. O. BOX 830
LIBERTY, SC 29657
PHONE – 864-843-4343
www.sealevel.com
Model# 2105
A “straight through” RS-232 cable and a DB25 to DB9 adapter will be required to connect the laptop to
the AGM-MZ.
Instruction 3015-5113
21
Ammonia Gas Monitor – Multi Zone
Current Loop Interfaces
Optional 4–20 mAdc Outputs
Upon installation of the optional 4–20 mAdc Interface Board (page 14) (P/N 3015-5152), the AGM-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
Connection
The external devices are connected to the AGM-MZ 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: 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 AGM-MZ. The signal for both current
loops must be returned to the AGM-MZ.
Current Loop Connector
GROUND
NOTE:
SIGNAL OUT
ONLY DO NOT
APPLY POWER
LOOP 1
ZONE
LOOP 2
PPM
NOTE: The ground connections are common.
22
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 3015-5113
Ammonia Gas Monitor – Multi Zone
Connecting External Alarms
Overview
Each AGM-MZ includes 4, Form C, SPDT relays. The contacts are rated 2A at 250 VAC (inductive) 5A at 250
VAC (resistive). These relays are used for the connection of external alarm devices. The relays are factory
assigned to the following conditions:
Relay #1 Leak
Relay #2 Spill
Relay #3 Evacuate
Relay #4 Fault
Connection
Use the AC 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.
AGM-MZ Relay Connector
NOTE: Each relay may be connected as normally open (NO), or normally closed (NC).

The relay contacts are rated 2A at 250 VAC (inductive) 5 A at 250 VAC (resistive).

Latching / Non-Latching – refer to page 26 to select Alarm Ack Mode.

Alarm power source – power for the alarm devices connected to the relay contacts may be supplied
from the AC Power Input Connector (page 14).
Instruction 3015-5113
23
Ammonia Gas Monitor – Multi Zone
Typical AGM-MZ Relay 1 and Relay 2 Wiring
Red*
Yellow*
Leak / Spill / Evacuate / Fault
NC
COMMON
NO
RELAY
*The colors correspond to
the LEDs on the front of the
case.
Normal configuration:
Strobes are usually connected
to the Leak relay (#1)
Strobe or
Horn
Horns are usually connected
to the Spill relay (#2).
LINE
NEUTRAL
External Power:
LINE POWER
AC < 250V
DC < 15W
Note: The device does not power
accessories; power must come from
an external source.
Jumper the ‘Neutral’ of the input power connector to the ‘Common’ on the relay block. Connect one end of
strobe or horn to the ‘NO’ of whichever level of alarm is appropriate for application. The other end of strobe or
horn is connected to the ‘Line’ of the input power connector (5 A maximum).
24
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
3 Setup Programming
Display Screens
Initial Power Up
When the AGM-MZ 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.
AGM System Setup Screen #1
Instruction 3015-5113
25
Ammonia Gas Monitor – Multi Zone
Navigating to the 2nd Setup Screen
From AGM System Setup Screen #1, select the SYSTEM option to go to AGM System Setup Screen #2.
Select the ESC key to return to the System Setup Screen #1.
AGM System Setup Screen #2
Location
This is the name you assign to the AGM-MZ 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 AGM 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 34.)
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
26
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
Audible Alarm
This parameter selects the function of the AGM-MZs 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.
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.
Instruction 3015-5113
27
Ammonia Gas Monitor – Multi Zone
Navigating to the 3rd Setup Screen
From AGM System Setup Screen #2, select the MORE option to go to AGM System Setup Screen #3.
Select the BACK option to return to AGM System Setup Screen #2.
AGM 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 AGM 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.
28
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
Accessing Additional Features
Several additional features can be viewed on the System Setup Screen #3 when the AGM is placed in
service mode (refer to Service Mode on page 43). 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
Instruction 3015-5113
29
Ammonia Gas Monitor – Multi Zone
4 General Operation
Functional Overview
Normally each AGM-MZ will sequentially perform measurements on its active zones without user input. The
total time it takes an AGM-MZ 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 AGM-RD operates by polling the network approximately once every 12 seconds to determine the current
status of the AGM-MZ monitors. If more than one AGM-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 AGM-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 AGM-MZ 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 Type
This displays the kind of gas the AGM-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.
3. Press ENTER to accept the new entry or ESC to revert to the previous setting.
30
Instruction 3015-5113
Ammonia 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 500 ft.
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 AGM-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.
Instruction 3015-5113
31
Ammonia 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 evacuation 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 AGM-MZ completes a measurement cycle in the affected zone the alarm condition
will be indicated. At that time the red ALARM LED on the AGM-MZ 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 AGM-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.
32
Instruction 3015-5113
Ammonia 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:

Complete location information

Gas type and current concentration (CONC NOW)

Peak concentration and peak time

Type of alarm, alarm time, and date
Instruction 3015-5113
33
Ammonia Gas Monitor – Multi Zone
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 26). 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 AGM-MZ are acknowledged, its RED LED will turn off and any
external alarms connected to the AGM-MZ relays will de-activate. All pending alarms across the entire
network must be acknowledged before the AGM-RD returns to normal operation. Once that occurs, its RED
LED will turn off and any associated external alarms connected to the AGM-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).
The next time the AGM-RD 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).
34
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
Depending on the nature of the fault, the AGM-MZ may or may not continue to operate normally. Under a
non-critical fault condition, the AGM-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 AGM-MZ 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.
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 – 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 AGM-MZ 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 AGM-MZ will clear the fault the next time it polls
the effected zone and the AGM-RD will return to normal operation the next time that it polls the AGMMZ.
 NO FLOW ON PURGE – 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.
 NO FLOW DETECTED – Check for proper pump operation. Examine the hydrophobic filter for
contaminants or water on the input side. If the input side is gray, a contaminant is present and the filter
must be replaced. To drain, remove the tubing from both sides of the filter and tap the tubing on a hard
surface to dislodge the contents.
 CLIPPING FAULT – The detector voltage may be out of tolerance. Refer to the Diagnostic Screen for
the DET voltage, AVE voltage and ZERO voltage. Call the factory with this information for further
instructions.
 REZERO VOLT TOL – The detector output voltage is out of tolerance. Refer to the Diagnostic Screen
and contact the factory for assistance.
 TRIGGER FAULT – No trigger from IR source pulser. Contact factory with all information from the
DIAGNOSTIC SCREEN for further instructions.
Instruction 3015-5113
35
Ammonia Gas Monitor – Multi Zone
Non Critical Faults
 BOX TEMP FAULT – 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 – 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 – 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.
 LOOP FAULT – 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 – There is an error in AGM Setup Screen #2 – Number Zones Installed field, or in AGMRD Setup Screen #1 – Number of AGMs on Network field. Check that the number of zones installed for
each AGM unit and the number of AGM units on the network are properly programmed. Check to ensure
that the manifold solenoid cable connector in each AGM 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 AGM-MZ –
1.
2.
3.
4.
5.
6.
Press and hold down the UP and DOWN arrow keys on the HGM-MZ (page 15);
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 AGM-MZ as described in the AGM-MZ – Setup Programming section on page 25.
Clearing System Faults
If the fault condition is associated with an AGM-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 AGM-RD will return to normal operation the next time it polls the
affected AGM-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 AGM-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 AGM-RD will return to normal operation the next
time it polls the affected monitor.
36
Instruction 3015-5113
Ammonia 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 corner.
The Flow Log can be reset by pressing a combination of the ENTER and RIGHT arrow buttons while viewing
the log.
Instruction 3015-5113
37
Ammonia 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.
The trend data is stored on a first-in, first-out basis. After 100 trend values have been stored the 101st 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.
38
Instruction 3015-5113
Ammonia 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 select the appropriate gas.
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
IMPORTANT: When calibrating the AGM-MZ a desiccant MUST be used to ensure all moisture is
removed from the purge air.
The CAL FACTOR is determined by sampling a known dilution of the type of ammonia 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 ammonia 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 AGM should be operating for at least one hour prior to performing a calibration.
Prepare the AGM-MZ for sampling by initially setting its CAL FACTOR to 1.000. Next, set up the AGM-MZ for
a logging interval of zero minutes, and place the AGM-MZ 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 AGM-MZ 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.
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.
Instruction 3015-5113
39
Ammonia Gas Monitor – Multi Zone
Programming New Gasses
As new gasses come into use, the AGM-MZ allows the addition of these new gases to its 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. 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, 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.
40
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
The Diagnostic Screen
Navigating to the Diagnostic Screen
On the System Screen, select the AGM-MZ unit you wish to view and press ENTER to access that monitor’s
Setup Screen. On the Setup Screen, select the Diagnostic option (DIAG) to access the Diagnostic
Screen.
Diagnostic Screen
01 ZONE 1 LOC
DET
4.2251V
AVE
4.2273V
ZERO 4.2267V
NOISE 0.0009V
AVEAU 0.00014
UM/L
0.000B
PPM
0.7B
Optical Sensor
Output Voltages
F
F
F
R717 NOW ZERO DELTA
F
BENCH 27.78C
F
BOX 29.97C
PRES 13.63PSIA
VAC 11.34PSIA
AMB 14.54PSIA
FAULT CODE=0000
F
Receive port # bytes
Transmit port # 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 3.900V to 4.500V.
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.
Instruction 3015-5113
41
Ammonia Gas Monitor – Multi Zone
NOISE: A 16 point running average of the noise portion of IR bench output. This reading is valuable
mostly when ammonia is not present.
AVEAU: Average Absorbency – Optical absorbency computed from the Average Detector Voltage
and Zero Voltage. In the absence of ammonia, the absorbency is 0.000AU. When sampling ammonia,
its value varies proportionally with the concentration.
UM/L: uMoles/L – Absolute concentration in micro-moles per liter of ammonia 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 AGM-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 29.
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.
42
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
5 Maintenance
Warnings & Cautions
WARNING: Shock hazard! Always disconnect AC power before opening the enclosure
of the monitor.
CAUTION: The AGM-MZ contains sensitive electronic components that can be easily
damaged. Do not touch nor disturb any components. Do not dislodge electrical wiring
or pneumatic tubing.
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 07-1650).
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 3015-5111).
The gas-sample line 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).
Fuses
The AGM-MZ is protected from electrical damage by two, 1A, 250 V, type “F” fuses. Locate the fuse holders
(page 14) 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).
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).
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 AGM-MZ 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 AGM-MZ setup must also be
updated to recognize the new zones.
Instruction 3015-5113
43
Ammonia Gas Monitor – Multi Zone
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 AGM-MZ. The interface board plugs
into the sockets provided on the valve/pump drive PCB, and the external devices are then cabled to the AGMMZ as described earlier in this manual.
Replacement Parts & Optional Accessories
Replacement Parts
Item Description
Part Number
AGM-MZ complete assembly (4 Zone)
3015-5047
(8 Zone)
3015-5048
(12 Zone)
3015-5049
(16 Zone)
3015-5050
Battery: Panasonic CR2032, 3V
204-0020*
Hydrophobic Filter
07-1650
3015-3420
Termination
(gas sample line)
Fuse: 1.0 A, 250 V, Type “F”
04-2620
Replacement Pump
3015-5176
Tubing: ¼ in OD
304-5111
Specify length when ordering.
*Warning: In compliance with agency approvals & safety regulations, the
battery must be replaced with the specified Bacharach replacement part.
Optional Accessories
Item Description
Part Number
Surge Protectors:
44
120 VAC
3015-4121
4-20 mA
3015-4123
Alarm: Audible/Visual 120 VAC
3015-3076
Interface Board, 4-20 mA
3015-5152
Annual Maintenance Kit
3015-5199
Four Port Expansion Kit
3015-5171
Four Zone Line End Filters Kit
3015-3411
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
Specifications
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. System design
supports compliance to the gas monitoring requirements of ANS/BSR ASHRE 15-1994.
Coverage
4 point standard, expandable to 16 points in 4 point increments
Detector Type
Infrared Non-Dispersive
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
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.
Temperature Drift
±0.3% of reading per degrees C
Sampling Mode
Automatic or manual (hold)
Re-Zero
Auto or on zone change
Response Time
5 to 120 seconds – depending on air line length and number of zones
System Noise
Less than 40dB(A) @ 10 feet (3m)
Monitoring Distance
500 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)
and 5 A at 250 VAC (resistive). Three assigned to PPM level alarms, one assigned to
system faults
Communications
Full two-way communication with AGM-RD 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)
Specifications subject to change without notice
Instruction 3015-5113
45
Ammonia Gas Monitor – Multi Zone
Appendix A
Recommended Alarm Settings & Gas Enumeration
Gas
Leak PPM
Spill PPM
Evacuate PPM
Ammonia / NH3,/ R-717
50
150
300
Allowable Exposure Level (AEL) ASHRAE 34-1992.
46
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
Appendix B
RS-485 Communication Protocol
Overview
The following instructions are intended as a guide for integrating the AGM-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 AGM-MZ monitor communicates with master devices (such as the AGM-RD 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:
http://www.modicon.com/techpubs/TechPubNew/PI_MBUS_300.pdf
Specific communication software is available at: http://www.bacharach-inc.com/downloads.htm
Instruction 3015-5113
47
Ammonia Gas Monitor – Multi Zone
AGM-MZ MODBUS RTU Operation
Overview
The AGM-MZ and AGM-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
AGM-MZs 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 AGM-MZ, placing the AGM-MZ in any of its different operating modes. The network may be
configured so that the AGM-MZs are connected directly to the MODBUS master device, or the MODBUS
master device may communicate with the AGM-MZs through the AGM-RD.
(NOTE: This document was written with the assumption that the reader is familiar with the various setup
parameters and operational modes for the AGM-MZ.
Protocol Details
A 2 wire RS-485 bus is used for transmission, therefore communication occurs in a Half-Duplex mode. The
AGM-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 AGM on the network. AGM data is organized into structures (internal to the AGM-MZ) 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 AGM-MZ responds by sending the contents of the structure referenced by the
specified register. After the master validates the AGM-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 AGM-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 AGM-MZ, 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 AGM-MZ 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 AGM-MZ.
AGM-MZ Polling
After the AGM-MZs are setup and operating, the master device need only poll each AGM for its status
register which contains summary data of the AGM’s 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 AGM-MZ requires a minimum of 20 seconds to complete a gas concentration measurement for a
single zone. Therefore, it is not necessary to poll the AGM-MZ 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 AGM-MZ. Under no circumstances should the AGM-MZ be continuously
polled at rate faster than 500mS, as this could result in erroneous readings by the AGM-MZ.
Network Topologies
AGM-MZs may be connected directly to the MODBUS network or they may be connected to the network
through an AGM-RD. In either case, each AGM-MZ must have a unique node ID. Up to 15 AGM-MZs can
be connected directly to the MODBUS network.
If AGM-MZs are accessed via an AGM-RD connected to a MODBUS network, the AGM-RD “BMS enabled”
parameter must be set equal to “1” via the “RDM SETUP” screen on the AGM-RD. The same commands and
registers are used to communicate with the AGM-MZ directly or through the AGM-RD. If the communications
is through the AGM-RD, it monitors each MODBUS message to determine if the message is intended for one
of the AGM-MZs it is connected to. If it is, the AGM-RD passes the message through to the AGM-MZs. If it is
48
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
not, the message is not passed through. The AGM-RD does not make any modifications to MODBUS
messages. It simply passes the query through to the AGM-MZ, and passes the response back to the
MODBUS master. In other words, it allows the AGM-MZs to be logically connected to the MODBUS network,
when physically they are connected to the local AGM-RD network. It is very important to understand that the
AGM-RD will only pass messages through to the AGM-MZ when the AGM-RD is either in the “SYSTEM”
screen or the “ZONE VIEW” screen. If the AGM-RD is in any other screen, it will return a MODBUS “busy”
exception response (exception code 06).
All AGM-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 AGM-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
AGM-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 AGM-MZ
8,000mS when accessing the AGM-MZ through the AGM-RD.
Error Checking:
CRC per MODBUS specifications
NOTE: All data sent out from the AGM-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 3015-5113
49
Ammonia Gas Monitor – Multi Zone
Summary of Registers
Register Name
Number
HEX
Decimal
Description
System Data
0x0010
16
R/W
AGM 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 AGM-MZ date & time
Sensor Data
0x0016
22
R
Raw measurement of sensors
Rel. Hold
0x0017
23
W
Release AGM-MZ out of hold mode
Hold Zone
0x0018
24
W
Put AGM-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 AGM-MZ into service mode
Rel Serv.
0x001C
28
W
Release AGM-MZ from service mode
PPM
0x001E
30
R
PPM values for all zones
Zone Log
0x3yxx
0-6
Trend data for each AGM-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
50
Instruction 3015-5113
Ammonia 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 AGM-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 AGM-RD and AGM-MZ or
MODBUS master and AGM-MZ depending on the Network topology).
Default=9 (19.2K); other values are 8=9600, 7=4800
UNUSED
UI
2 bytes
UNUSED
Mode
Instruction 3015-5113
16dec
R/W
54 bytes
51
Ammonia 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 AGM-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 AGM-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
52
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
Zone Data
Register 0x12xxh R/W
78 bytes
Each zone for an AGM-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
Gas 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: AGM-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 AGM-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.
Alarms & Alarm Acknowledge
The AGM-MZ 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 a AGM-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., ammonia leak) that initially causes the AGM-MZ 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 AGM-MZ alarm will be created. If
the alarm condition is subsequently removed, the AGM-MZ alarm will automatically be cleared by the
AGM-MZ 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 AGM-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 AGM-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
Instruction 3015-5113
53
Ammonia Gas Monitor – Multi Zone
register. This will cause the alarm to be “silenced” in the AGM-MZ (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 AGM-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 AGM-MZ alarm will be created.
The AGM-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 AGM-MZ, 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 AGM-MZ.
54
Instruction 3015-5113
Ammonia 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 3015-5113
55
Ammonia 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
AGM-MZ Hold Mode
The AGM-MZ 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 AGM-MZ into hold mode:
1. Read the AGM-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 AGM-MZ using PRESET MULTIPLE
REGISTER COMMAND to the HOLD ZONE REGISTER (0x0018h).
Releasing the Zone hold:
1. Read the AGM-MZ 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 AGM-MZ using PRESET MULTIPLE
REGISTER COMMAND to the RELEASE HOLD REGISTER (0x0017h).
56
Instruction 3015-5113
Ammonia 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)
R 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 3015-5113
57
Ammonia 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
AGM-MZ Service Mode
The AGM-MZ 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 AGM-MZ into Service Mode:
1. Read the AGM-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 AGM-MZ using PRESET MULTIPLE
REGISTER COMMAND to the SERVICE MODE REGISTER (0x001Bh).
Releasing the unit from Service Mode:
1. Read the AGM-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 AGM-MZ 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 AGM-MZ 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)
58
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
MODBUS Exception Responses
The following MODBUS exception responses are supported by the AGM-MZ:
01
Illegal Function
02
Illegal Data Address
06
Slave Device Busy (Occurs only when AGM-MZ is connected to the bus through an AGM-RD and
the AGM-RD is not in the SYSTEM or ZONE VIEW screen)
Instruction 3015-5113
59
Ammonia Gas Monitor – Multi Zone
Appendix C
Select the zone in
screen & press ENTER
OR
Select ZONES on
60
Instruction 3015-5113
Ammonia Gas Monitor – Multi Zone
Select the zone in the
& press ENTER
OR
Select ZONES on
Instruction 3015-5113
61
Ammonia Gas Monitor – Multi Zone
NOTES:
Headquarters:
621 Hunt Valley Circle, New Kensington, PA 15068
Website: www.mybacharach.com • E-mail: help@mybacharach.com
Printed in U.S.A.
® Registered Trademark of Bacharach Inc.
Download PDF