Bacharach Single-Zone (SZ) Monitors Manual

Bacharach Single-Zone (SZ) Monitors Manual
Single Zone Gas Monitors
HGM-SZ (Halogen) and AGM-SZ (Ammonia)
Instruction 3015-4256
Installation / Operation / Maintenance
Rev 11 – October 2011
UL 61010-1
CSA 22.2 No. 61010-1
EN 14624
Product Leadership • Training • Service • Reliability
Single Zone Gas Monitor
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
NOTICE
Effective as of revision 4, this instruction manual refers to the current “new style” of Single-Zone leak monitoring
equipment (which has its pump mounted on the inside bottom of the cabinet). For information on the older style of
monitoring equipment (pump mounted to the inside top of the cabinet), refer to Rev 3 of this manual. Contact
Bacharach for additional information.
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.
Patent 6,590,690
Copyright © 2005-2011, 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.
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Single Zone Gas Monitor
Table of Contents
SECTION 1. INTRODUCTION..................................................................................................................... 1 1.1. 1.2. 1.3. 1.4. 1.5. How to Use This Manual..................................................................................................................... 1 Warning Statements ........................................................................................................................... 1 Caution Statements ............................................................................................................................ 1 Hazard Symbols Located on the Monitor ........................................................................................... 1 Safety Precautions.............................................................................................................................. 1 1.5.1. AC Power Supply .................................................................................................................... 2 1.5.2. Protective Grounding ............................................................................................................... 2 1.5.3. Explosive Atmosphere ............................................................................................................. 2 1.5.4. Proper Exhaust Venting .......................................................................................................... 2 1.5.5. Accessing the Interior of the Monitor ....................................................................................... 2 1.5.6. Misuse and Modifications to the Monitor ................................................................................. 2 1.5.7. In Case of Malfunction ............................................................................................................. 2 1.5.8. Fusing ...................................................................................................................................... 3 1.5.9. Installation Category ................................................................................................................ 3 1.5.10. Altitude Limit ............................................................................................................................ 3 1.5.11. Cleaning .................................................................................................................................. 3 1.6. Functional Overview ........................................................................................................................... 3 1.6.1. General Description ................................................................................................................. 3 1.6.2. Understanding Monitoring Levels ............................................................................................ 3 1.6.3. Suggested Location of Sampling Point ................................................................................... 4 1.7. Specifications ...................................................................................................................................... 5 SECTION 2. INSTALLATION ...................................................................................................................... 7 2.1. Installation Considerations.................................................................................................................. 7 2.1.1. Warnings and Cautions ........................................................................................................... 7 2.1.2. Inspection ................................................................................................................................ 7 2.1.3. Location of the Monitor ............................................................................................................ 7 2.2. Mounting Instructions.......................................................................................................................... 7 2.3. Connecting Gas Sample and Exhaust Lines ...................................................................................... 8 2.3.1. Overview.................................................................................................................................. 8 2.3.2. Tubing Considerations ............................................................................................................ 9 2.3.3. Connecting the Gas Sample Line............................................................................................ 9 2.3.4. Connecting the Exhaust Line .................................................................................................. 9 2.3.5. Connecting the Purge Line .................................................................................................... 10 2.3.6. Installing Optional Splitter Kit ................................................................................................ 10 2.3.7. Connecting the Water Trap ................................................................................................... 10 2.4. Interior Schematic (Halogen HGM) .................................................................................................. 11 2.5. Interior Schematic (Ammonia AGM) ................................................................................................. 12 2.6. Electrical Wiring ................................................................................................................................ 13 2.7. Connecting External Alarms ............................................................................................................. 14 2.7.1. Overview................................................................................................................................ 14 2.7.2. Connection ............................................................................................................................ 14 2.8. 4–20 mA Current Loop Interface ...................................................................................................... 16 SECTION 3. OPERATION ......................................................................................................................... 17 3.1. Front Panel Display and Controls ..................................................................................................... 17 3.2. General Operation ............................................................................................................................ 18 3.3. Display Screens ................................................................................................................................ 19 3.3.1. Initial Power Up ..................................................................................................................... 19 3.3.2. Data Display Screen .............................................................................................................. 19 3.3.3. Function Screens .................................................................................................................. 19 3.4. Gas Alarms ....................................................................................................................................... 22 P/N: 3015-4256 Rev 11
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Single Zone Gas Monitor
3.5. 3.6. 3.7. 3.8. 3.9. 3.10. 3.4.1. Overview................................................................................................................................ 22 3.4.2. Clearing / Silencing a Gas Alarm .......................................................................................... 22 3.4.3. Viewing the Gas Alarm Log ................................................................................................... 22 System Faults ................................................................................................................................... 23 3.5.1. Overview................................................................................................................................ 23 3.5.2. Clearing / Silencing a Fault Alarm ......................................................................................... 23 3.5.3. Viewing the Fault Log ............................................................................................................ 23 3.5.4. Fault Codes ........................................................................................................................... 24 Clearing the Stored PPM Log, Alarm and Fault Data....................................................................... 25 Reset to Factory Default Settings ..................................................................................................... 25 The P-CHK Function......................................................................................................................... 25 3.8.1. Overview................................................................................................................................ 25 3.8.2. Keypad Functions .................................................................................................................. 25 3.8.3. Screen Display ...................................................................................................................... 25 The DIAGNOS Function ................................................................................................................... 26 3.9.1. Overview................................................................................................................................ 26 3.9.2. Keypad Functions .................................................................................................................. 26 3.9.3. First Diagnostic Screen ......................................................................................................... 26 3.9.4. Second Diagnostic Screen .................................................................................................... 26 The Calibration Function................................................................................................................... 27 3.10.1. Overview................................................................................................................................ 27 3.10.2. Calibration Procedure ............................................................................................................ 27 3.10.3. Adjusting Calibration Factor .................................................................................................. 27 SECTION 4. MAINTENANCE ................................................................................................................... 28 4.1. 4.2. 4.3. 4.4. 4.5. 4.6. 4.7. 4.8. 4.9. 4.10. 4.11. Warnings and Cautions .................................................................................................................... 28 Charcoal Filter (Halogen Gas Monitor Only) .................................................................................... 28 Hydrophobic Filters ........................................................................................................................... 28 Servicing Air Lines and Termination Filters ...................................................................................... 28 End-of-Line Water Stop (Optional) ................................................................................................... 28 Water Trap (Optional) ....................................................................................................................... 28 Fuses ................................................................................................................................................ 28 Clock Battery .................................................................................................................................... 29 Sample Pump ................................................................................................................................... 29 Replacement Parts and Optional Accessories ................................................................................. 29 Service Centers ................................................................................................................................ 30 APPENDIX A. DATA TABLES .................................................................................................................. 31 A.1. Recommended Alarm Settings ........................................................................................................... 31 A.2. Response Time/Flow Rate ................................................................................................................. 32 APPENDIX B. AGENCY APPROVALS .................................................................................................... 33 iv
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Single Zone Gas Monitor
SECTION 1. INTRODUCTION
1.1. How to Use This Manual
Thank you for investing in a BACHARACH Single Zone Monitor. This manual provides important
information on how to install, operate, and service the SZ monitoring unit.
To assure operator safety and the proper use of the monitor, please read, understand, and follow the
contents of this manual.
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, you can educate yourself about the principles of gas detection
and the proper operation of this device by reading this manual thoroughly.
1.2. 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.
1.3. 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.
1.4. Hazard Symbols Located on the 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.
1.5. Safety Precautions
WARNING: This instrument has not been designed to be intrinsically safe for use in areas
classified as hazardous locations. For your safety, DO NOT use it in hazardous (classified)
locations.
WARNING: This is NOT a safety device. Some gases which this instrument can detect
may be combustible/flammable. When properly configured, this instrument is designed to
alarm at concentrations that are lower than the explosive limit of the gas. As such, it is the
buyer’s responsibility to initiate an immediate planned response to any gas leaks as soon
as they are detected. This equipment should NEVER be used to measure or sample
gases at or above their respective lower explosive limits.
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1.5.1. AC Power Supply
IMPORTANT: The Single Zone monitor uses a universal power supply that is capable of
accepting inputs of 100 to 240 VAC, 50/60 Hz. The monitor’s power consumption is
15 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).
WARNING: A switch or circuit breaker rated 1.0 A, 250 VAC, with a minimum terminal
spacing of 3.0 mm 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.
1.5.2. Protective Grounding
WARNING: Under no circumstances should the SZ unit 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.
1.5.3. Explosive Atmosphere
WARNING: Do not operate this equipment in the presence of flammable liquids, vapors or
aerosols. Operation of any electrical equipment in such an environment constitutes a
safety hazard.
1.5.4. Proper Exhaust Venting
WARNING: It is imperative that the monitor’s exhaust port be vented as described in this
manual. Failure to do so may constitute a safety hazard.
1.5.5. Accessing the Interior of the Monitor
WARNING: 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 performing work inside the monitor.
1.5.6. Misuse and Modifications to the Monitor
WARNING: 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.
NOTE: Use ONLY the provided knockouts for electrical and communications wiring.
Drilling into the box will void the warranty.
1.5.7. In Case of Malfunction
WARNING: 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.
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1.5.8. Fusing
WARNING: This device uses type “F” fuses (F1 and F2) rated at 1.0 A, 250 VAC.
Replace ONLY with Bacharach-approved fuses.
1.5.9. Installation Category
IMPORTANT: This device is classified as Installation Category II, Pollution Degree II, as
defined by UL.
1.5.10.
Altitude Limit
IMPORTANT: This device is designed for operation at or below an altitude of 6,562 ft
(2,000 m). Do not operate this device above this altitude limit.
1.5.11.
Cleaning
NOTE: 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.
1.6. Functional Overview
1.6.1. General Description
Single zone gas monitors are specified to support compliance to federal, state and local safety codes
governing gas emissions. Avoiding significant loss reduces equipment replacement costs, maintains
equipment efficiency, promotes safety, and protects the environment.
The Bacharach SZ is designed to continuously test for the presence of gas in an area that is located up to
500 ft (152.4 m) away from the monitor. The SZ monitor displays the type of gas being monitored, along
with displaying both the current gas level and the peak gas level detected in that area on its front panel
LCD. The monitor 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 includes a
420 mA current loop interface that can be connected to remote monitoring equipment.
The SZ 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 operator to identify the cause of the fault.
1.6.2. Understanding Monitoring Levels
Effective use of this monitor requires an understanding of what constitutes reasonable alarm set points for
the type of gas being monitored. Most systems leak some gas. In a good “tight” installation these
background levels will be acceptably low and often do not require corrective action. You can reduce
nuisance alarms and needless service calls if the alarm levels are set at practical limits. Bacharach has
developed recommended monitoring levels based on compliance to ANSI/BSR ASHRAE 15-2007 and
ASHRAE Safety Code 34-2007. These reference levels are listed in the Appendix.
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Single Zone Gas Monitor
The SZ monitor is shipped with its leak, spill, and evacuate alarm levels set at 100, 300 and 500 ppm
respectively. 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 alarm set points may need to be adjusted either up or down to
achieve effective monitoring.
1.6.3. Suggested Location of Sampling Point
At the point of a gas leak, the gas is nearly pure. As gas is dispersed into the air, the gas molecules
diffuse, causing a dilution of the original concentration. The SZ monitor measures the gas concentration
at the point the sample is collected. Therefore, if the termination of the collection line is not at the exact
point of the gas leak, then the monitor will read a diluted mixture of gas and air.
It should be noted that when refrigerant and ammonia gases are cold, they are heaver than air and settle
below the leak point. When the gas warms to room temperature, it becomes lighter than air and tends to
collect above the leak point. Consequently, the sampling point should be located as close as possible to
the source of a potential leak. If this is impractical, then the alarm set points should be adjusted to
compensate for the dilution of the gas.
The SZ monitor should be mounted outside of the mechanical room or just inside a doorway to the room.
This is the “split architecture design” for safety of the operator. The monitor should be readily accessible
for easy visual monitoring and servicing. The total length of the sample line + exhaust line can be up to
500 ft (152.4 m). If the area around the monitor is not well ventilated, then an optional exhaust line and
purge line can be run to an outside location. The total length of the exhaust line + the purge line cannot
exceed 200 ft (61.0 m).
It may be necessary to perform a “smoke” test of the mechanical room to determine the best monitoring
point. The smoke test would provide the pattern of air currents present in the room.
The SZ monitor should be kept dry. When used in a wet or humid area, it is highly recommended to use
the optional water stop accessory to avoid internal damage.
Figure 1-1. Aerial View of Example Single Zone Leak Monitor Placement in a Mechanical Room
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1.7. Specifications
Category
HGM-SZ Specifications
Product Type
Single-zone infrared monitoring system for low level continuous monitoring of CFC, HCFC
and HFC refrigerant gasses used in most commercial refrigeration systems. System design
supports compliance to the refrigerant monitoring requirements of ANSI/BSR ASHRAE 152007 and ASHRAE Safety Code 34-2007.
Gas Library:
CFC
HFP, R-11, R-113, R-114, R-12, R-502
HFC
R-125, R-134a, R-236FA, R-245Fa, R-404a (HP62), R-407a, R-407c (AC9000), R-410a
(AZ20), R-422a, R-422d, R-427a, R-507 (AZ50), R-508b (SUVA95)
HCFC
HALON
Other
R-123, R-124, R-21, R-22, R-227, R-23, R-401a (MP39), R-402a (HP80), R-402b (HP81),
R-408a, R-409a, R-500, R-503
H1211, H1301, H2402
FA188, FC72, HFO1234YF, N1230, R-420a, R-424a, R-426a, R-427a, R-438a
Sensitivity
All gasses 1 ppm
Measuring
Range
All gasses 0 to 10,000 ppm
Accuracy
Response Time
±1 ppm ±10% of reading from 0-1000 ppm
(R11, R22, R113: ±10 ppm ±15% of reading 0-1000 ppm)
105 seconds maximum (dependent on sample line length)
Category
AGM-SZ Specifications
Product Type
Single zone infrared monitoring system for low level continuous monitoring of ammonia
refrigerant gas used in most commercial refrigeration systems.
Gas Library
Ammonia / NH3 / R-717
Sensitivity
20 PPM (minimum detection limit)
Measuring Range
25-10,000 PPM
Accuracy
±10 ppm ±10% of reading from 25 to 1,000 ppm
Response Time
180 seconds maximum (dependent on sample line length)
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Single Zone Gas Monitor
Category
General Single Zone Specifications
Coverage
Single zone
Detector Type
Infrared, Non-Dispersive
Warm-up Time
15 minutes
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
Front Panel
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Size (HxWxD)
7.5" x 13.5" x 3.625" (190.5 mm x 343 mm x 92 mm)
Weight
5.5 lbs (2.5 kg)
Temperature Drift
Less than 1 ppm per °C between purge cycles
Sampling Mode
Automatic (continuous)
Re-Zero
Automatic (approximately every 5 minutes)
System Noise
Less than 50 dB(A) @ 10 feet (3m)
Monitoring Distance
500 ft. (152 m) maximum
Conditioned Signal
4-20 mA DC isolated output (ppm)
Alarms
Four SPDT alarm contacts are provided rated 2A at 250 VAC (inductive), 5 A at
250 VAC (resistive)
Three assigned to PPM level alarms, one assigned to system faults
Communications
Full two-way communication with 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, 15 Watts
Certification
UL 61010-1, CAN/CSA 22.2 No. 61010-1 and CE Mark
Warranty
2 years from date of shipment
Altitude Limit
6,562 ft (2,000 m) maximum
Sensor Life
7-10 years
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Single Zone Gas Monitor
SECTION 2. INSTALLATION
2.1. Installation Considerations
2.1.1. Warnings and Cautions
WARNING: Explosion hazard! Do not mount the SZ monitor in an area that may contain
flammable liquids, vapors or aerosols. Operation of any electrical equipment in such an
environment constitutes a safety hazard.
WARNING: Shock hazard! Always disconnect AC power before working inside
the monitor.
CAUTION: Drilling holes in the SZ enclosure may damage the unit and will void the
warranty. Please use knockouts provided for electrical connections.
CAUTION: The SZ unit contains sensitive electronic components that can be easily
damaged. Be careful not to touch or disturb any of these components.
2.1.2. Inspection
The SZ monitor has been thoroughly inspected and tested prior to shipment from the factory.
Nevertheless, it is recommended that the monitor be re-checked prior to installation. Inspect the outside
of the enclosure to make sure there are no obvious signs of shipping damage. Open the enclosure and
inspect the interior of the monitor for loose components that may have become dislodged during
shipment. If damage is discovered, please contact the nearest Bacharach Service Center for assistance.
2.1.3. Location of the Monitor
Place the monitor in a location that will require no more than 500 ft (152.4 m) of tubing (total of sample
line + exhaust) to reach the sampling area. The ammonia monitor typically requires a purge air line
(maximum of 100 feet). The halogen monitor uses ambient air to zero its gas sensor, so the monitor
should be located in an area that normally does not contain gas. If an exhaust line is not used, locate the
monitor in a well ventilated area so that the exhaust gas does not accumulate around the monitor’s
ventilation holes. An exhaust line can be up to 100 feet in length.
The SZ unit should be operated in an environment that is between 32 and 122°F (0 and 50°C); has a
relative humidity that is from 5 to 90% non-condensing; and is at an altitude of no more than 6,562 ft
(2,000 m). The area should also be relatively free of dirt, grease, and oils that could adversely affect the
operation of the monitor.
The location should allow the monitor to be easily accessible for visual monitoring and servicing.
2.2. Mounting Instructions
The SZ monitor should be installed plumb and level and securely fastened to a rigid mounting surface.
The enclosure utilizes keyhole mounting designed for ¼ inch fasteners. Install the four screws as
displayed in the diagram below or by using the provided mounting template. Allow the screw heads to
protrude approximately ¼ inch.
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Single Zone Gas Monitor
Figure 2-1. Enclosure Mounting Specs
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.
2.3. Connecting Gas Sample and Exhaust Lines
2.3.1. Overview
A single gas-sample line must be run from the SZ unit to the area of the facility to be monitored. An
optional exhaust line can be installed to vent the sample gas away from the monitor. All tubing
connections are made on the bottom of the enclosure as displayed in the illustration below.
Figure 2-2. HGM-SZ Monitor Bottom View
* There is an additional service knockout on top of the case.
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2.3.2. Tubing Considerations
Use ¼ in. outside diameter (0.040 in. wall) flex tubing for all air lines (P/N 0304-2743 or equivalent for
HGM; P/N 0304-2742 or equivalent for AGM). The tubing should be clean and free of 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.
IMPORTANT! Due to the reactive nature of refrigerant and ammonia gasses, it is
important to use materials that will not absorb the gas as it passes through the sampling
system. The use of unauthorized tubing or any other materials in the gas-sampling stream
may lead to erroneously low readings.
All tubing bends should have a radius of no less than 5" (127 mm) to ensure proper airflow. If kinks or
obstructions occur in the line, the monitor may not function properly.
2.3.3. Connecting the Gas Sample Line
Please refer to the section titled Suggested Location of Sampling Point (page 4) to learn more about
where to take a gas sample.
The gas-sample line can be up to 500 ft (152.4 m) in length. The combined length of the sample line and
exhaust line (if one is used) should not exceed 500 ft (152.4 m). The end of this line should be placed near
the potential leak source and positioned to reduce the possibility of mists, aerosols, oil, water, dust, or other
contaminates from being drawn into the monitor. For added protection, a termination filter (P/N 3015-3420)
supplied with the monitor must be attached to the end of this line.
CAUTION: The introduction of contaminants through the gas-sample line can result in
serious and permanent damage to the monitor.
Depending on type of use and location of lines, the optional end-of-line water stop filter assembly can be
used to prohibit moisture from entering the intake lines. Place the end of the intake line into the blue
receiver of the end-of-line water stop and tighten sufficiently.
NOTE: Only one filter assembly, either the line-end filter or end-of-line water stop, should
be used for each line.
2.3.4. Connecting the Exhaust Line
The exhaust line carries the exhausted gas sample away from the monitor and is required if the monitor is
located in a confined, poorly ventilated area. If no purge line is used (ammonia monitor) you must vent the
exhausted gas sample away from the monitor to prevent erroneous readings due to improper zeroing of
the detector. Note that if the monitor is exposed to an unusually high level of gas for prolonged periods of
time, its charcoal filter (Halogen Gas Monitor Only) will quickly become saturated and no longer able to
clean the purge-air of refrigerant gas.
The exhaust line can be up to 100 ft (30.52 m) in length. Ideally, this line should terminate outdoors in a
location that is not exposed to the elements. Connect the exhaust line to the monitor by firmly pushing the
tubing onto the barbed fitting. If the exhaust line terminates outside the building, position the tubing so
that no water or moisture can enter the line. Note that this line does not require a termination filter.
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Figure 2-3. Termination Filter (P/N 3015-3420)
2.3.5. Connecting the Purge Line
The purge is an intake line that draws fresh air into the instrument. It should not exceed 100 feet
(30.48 m) in length. It is advisable to terminate the purge line outdoors, provided the input is not exposed
to rain, snow, ice, exhaust fumes, or other airborne contaminates. If an outdoor installation is impractical,
the line should be run to an area inside the facility that you are certain is not contaminated with ambient
gas. If this is not possible, an optional charcoal filter assembly (P/N 3015-3125) can be used with the
monitor to filter refrigerant from the purge line. It may be mounted adjacent to the monitor. A line-end
filter (P/N 3015-3420) should be attached to the end of the purge line when the charcoal filter is not used.
2.3.6. Installing Optional Splitter Kit
Splitter Kits are made available which allow the SZ unit to take gas sample readings from several sample
points. These kits are designed for use ONLY in confined/defined spaces with high potential for leaks,
such as food cases, cold rooms, refrigeration rack rooms, etc. Bacharach’s SZ 2-way (P/N 3015-5404)
and 3-way (P/N 3015-5405) splitter kits are available as an optional accessory. Refer to instruction 30155415 (supplied with kit) for detailed installation instruction.
2.3.7. Connecting the Water Trap
The water trap (P/N 0007-1655) is an optional accessory for applications that result in water or
condensation frequently entering the intake lines. Install the trap close to the unit for the most effective
results. The intake line may be cut where the user finds appropriate (preferably close to monitor). Each
side of the intake line should be inserted into the receivers on either side of the water trap. Secure tightly.
A replacement filter (P/N 0007-1656) for the water trap is available and is replaced by unscrewing the
clear plastic cup of the water trap, pulling the filter directly out (do not unscrew), and inserting the new
filter into place. Replace the cup of the water trap. If desired, an optional mounting bracket (0007-1657)
may be used to secure the water trap in place.
NOTE: The termination filter (P/N 3015-3420) or end-of-line water stop filter (P/N 30155512) should be used, regardless of the presence of a water trap.
WARNING: Extreme temperatures and/or humid conditions may cause water to condense
in the tubes. A water trap is highly recommended for use in these scenarios.
10
P/N: 3015-4256 Rev 11
Single Zone Gas Monitor
2.4. Interior Schematic (Halogen HGM)
Figure 2-4. Interior Assembly of the Single Zone Halogen Gas Monitor
NOTE: The plastic cable tie surrounding the pump is for stability during shipping. Please
remove before operating. If the unit gets shipped to Bacharach for service, reinstall a
plastic cable tie around the pump to prevent damage during shipping.
**For IR Bench Gas In/Out, see SZ bottom view drawing on page 8.
P/N: 3015-4256 Rev 11
11
Single Zone Gas Monitor
2.5. Interior Schematic (Ammonia AGM)
Figure 2-5. Interior Assembly of the Single Zone Ammonia Gas Monitor
NOTE: The plastic cable tie surrounding the pump is to ensure safe handling during
shipping. Please remove before operating. If the unit gets shipped to Bacharach for
service, reinstall a plastic cable tie around the pump to prevent damage during shipping.
*For IR Bench Gas In/Out, see SZ bottom view drawing on page 8.
12
P/N: 3015-4256 Rev 11
Single Zone Gas Monitor
2.6. Electrical Wiring
The SZ unit 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 15 Watts (maximum). It is highly recommended that the
monitor be connected directly to the AC power source, preferably on its own circuit. The connection
should be completed with UL listed multi-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 (page 11).
Secure the incoming AC power neutral (white) and live (black) 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.
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.
A switch or circuit breaker
rated 1.0 A, 250 VAC, with
a minimum terminal spacing
of 3.0 mm 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.
Figure 2-6. AC Power Connections
WARNING: Electrical installation should be performed by a certified electrician, and should
comply with all applicable NEC/CEC and local electrical safety 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.
WARNING: Copper conductors for connection to supply mains must be made in
accordance with NEC/CEC and local codes
P/N: 3015-4256 Rev 11
13
Single Zone Gas Monitor
CAUTION: Drilling holes in the SZ enclosure may damage the unit and will void the
warranty. Please use knockouts provided for electrical connections.
2.7. Connecting External Alarms
2.7.1. Overview
The SZ monitor includes four SPDT relays whose contacts are rated 2 A at 250 VAC (inductive) and 5 A
at 250 VAC (resistive). These relays are used for the connection of external alarm devices that are
activated when the relay is energized. The relays are factory assigned to energize under the following
conditions:
Relay #1
Relay #2
Relay #3
Relay #4
Leak
Spill
Evacuate
Fault
Alarm Point 100 ppm
Alarm Point 300 ppm
Alarm Point 500 ppm
System Fault Event
NOTE: Alarm points of relays #1, #2, and #3 are set using the monitor’s LEAKLVL,
SPILLLVL, and EVACLVL function screens (page 22).
2.7.2. Connection
Use any of the service knockouts to gain cable access to the interior of the monitor. Locate the External
Alarm Relay Connector (page 11). Secure the leads from the external alarm device and its power source
to the connector as shown in the diagram below.
Figure 2-7. External Alarm Relay Connector
Each relay may be connected as normally open (NO), or normally closed (NC).
The relay contacts are rated 2 A at 250 VAC (inductive) and 5 A at 250 VAC (resistive).
Power for the alarm devices connected to the relay contacts may be supplied by an external 24 V DC
power source or the monitor’s AC input terminals.
In Figure 2-8, power to this device is being tapped off the monitor’s AC input. In Figure 2-9, power is
supplied from an external power source
14
P/N: 3015-4256 Rev 11
Single Zone Gas Monitor
Figure 2-8. Typical AC External Alarm Relay 1 Wiring
Figure 2-9. Typical DC External Alarm Relay 1 Wiring
P/N: 3015-4256 Rev 11
15
Single Zone Gas Monitor
Jumper the ‘Live/Positive’ line of an external power source (DC devices) or the monitor’s AC input (AC
devices) to the ‘Common’ terminal on the relay connector.
Connect the ‘Live/Positive’ end of the strobe or horn to the ‘NO’ terminal of whichever level of alarm is
appropriate for the application.
For protection, install an in-line fuse of the appropriate size and design for the external alarm device being
used.
The other end of the strobe or horn is connected to the ‘Neutral/Negative’ leg of the external power
source (DC devices) or monitor’s AC input (AC devices).
2.8. 4–20 mA Current Loop Interface
An external 4–20 mA monitoring device (e.g., chart recorder) can be connected to the SZ monitor using a
shielded-twisted-pair cable. Use any of the service knockouts to gain access to the interior of the monitor.
Locate the 420 mA Connector (page 11), remove it from the circuit board, and then remove the resistor
or shorting wire from its terminals.
IMPORTANT! The monitoring device must be isolated from ground (floating).
NOTE: A 100 Ohm, ¼ W resistor must be connected to the 4–20 mA connector if no
external monitoring device is used. Failure to install this resistor may cause a loop fault
code <0010> to occur (page 23).
Secure the wire leads from the external monitoring device to the 4–20 mA connector as shown in the
diagram below, making sure that the polarity at this connector matches the wiring at the monitoring
device.
The default current-to-ppm factor is set to 0.016 mA = 1 ppm, providing a measurement range 0 ppm
(4 mA) to 1,000 ppm (20 mA). Note that the current-to-ppm factor can be changed using the monitor’s
LOOP function (page 22).
To facilitate loop zero and span checking, note that when the LOOP function is selected the loop output is
set to 20 mA, and upon exiting this function the loop output is set to 4 mA.
Figure 2-10. 4–20 mA Current Loop Connector
CAUTION: Never apply power to the 4–20 mA Current Loop Connector from an external
power supply. Connect only a load resistor and/or a floating measurement device.
16
P/N: 3015-4256 Rev 11
Single Zone Gas Monitor
SECTION 3. OPERATION
3.1. Front Panel Display and Controls
Keypad
Use these buttons to:
1. Enter function mode, then move
arrow (>) on screen to the desired
function
2. Scroll through data
3. Change a function’s value
Monitor On LED (Green)
Flashes during warm-up
Lights steady during normal operation
System Fault LED (Yellow)
Flashes when one or more faults occur
Alarm LED (Red)
Flashes when detected gas level exceeds
any of three preset alarm points.
Display Screen
Displays current readings, menus, and
parameters.
Enter Button
Press this button to:
1. Clear peak reading
2. Save a function screen’s displayed value
Silence/Quit Button
Press this button to:
1. Acknowledge a system fault or gas alarm by
turning OFF the internal audible alarm and
de-energizing the corresponding fault/alarm
relay.
2. Return to the previous screen without saving
data when in the function mode.
Figure 3-1. Front Panel Display and Controls
P/N: 3015-4256 Rev 11
17
Single Zone Gas Monitor
3.2. General Operation
Once the SZ monitor has been installed, set up, and powered ON, the
monitor will make measurements in the area being sampled for desired
gas without further operator intervention. The results of those
measurements are shown on the front panel display.
MEASURE
00485 pk
45ppm R134A
In the example shown above, MEASURE indicates that the SZ unit is actively monitoring for refrigerant
gas, and that currently 45 ppm of R-134A (refrigerant gas) is being detected. This display also indicates
that a peak measurement of 485 ppm has been made.
An operator can reset the peak value to zero by pressing the ENTER button.
A log of up to 200 previous measurements can be viewed using the PPM LOG function (page 22).
If the detected gas level exceeds the preset Leak, Spill, or Evacuate alarm point, then the monitor
responds by turning ON the front panel ALARM (red) light and energizing the corresponding alarm relay.
If the internal audible alarm is turned ON, it too will activate (AUDALRM page 22). Optional external
alarm devices can be connected to the alarm relays to alert personnel that a Leak, Spill, or Evacuate
alarm condition has occurred (page 14). Pressing the front panel SILENCE button will acknowledge an
alarm and turn OFF all alarm indicators with the exception of the front panel ALARM light. The alarm
circuit will reactivate, however, if the alarm condition is not cleared within the time period set by the
SILENCE function (page 22). The ALARM light will turn OFF after the detected gas level goes below the
lowest alarm point and after the SILENCE button is pressed.
If a system fault occurs (see Fault Code list on page 23), the monitor responds by turning ON the front
panel SYSTEM FAULT (yellow) light and energizing the fault relay. If the internal audible alarm is turned
ON, it too will activate (AUDALRM page 22). An optional external alarm device can be connected to the
fault relay to alert personnel that a system fault has occurred (page 14). Pressing the front panel
SILENCE button will acknowledge the fault and turn OFF all alarm indicators with the exception of the
front panel SYSTEM FAULT light. The alarm circuit will reactivate, however, if the fault condition is not
cleared within the time period set by the SILENCE function (page 22). The SYSTEM FAULT light will turn
OFF only after the cause of the fault has been eliminated.
A log of the alarm and fault events can be viewed using the monitor’s ALARMS and FAULTS function
(page 22).
18
P/N: 3015-4256 Rev 11
Single Zone Gas Monitor
3.3. Display Screens
3.3.1. Initial Power Up
When the SZ monitor is first powered up all front panel lights are turned
ON, and a splash screen appears showing the monitor’s firmware
revision level. After a brief moment the Warm Up screen is display
along with the front panel MONITOR ON light (green) blinking.
The monitor takes 15 minutes to warm up; after which, the MONITOR
ON light glows steadily and the Data Display screen is displayed.
BACHARACH
VERSION x.xx
WARM UP
3.3.2. Data Display Screen
During normal operation, the Data Display screen shows when the
monitor is performing the following three functions:
MEASURE
MEASURE indicates that the monitor is actively measuring for selected
gas. In the example screens shown above, the monitor is currently
detecting 0 ppm of R-134A (refrigerant gas), and that a peak
measurement of 485 ppm has occurred.
PURGE
To reset the peak value to zero, press the ENTER button.
PURGE is displayed when the monitor is resetting its infrared detector
to a baseline of 0 ppm using fresh (zero) air that is being drawn in
through the Purge Air Inlet Port. This purging process is performed on
an “as needed” basis, which is normally once every 6 to 8 minutes.
00485pk
0ppm R134A
00485pk
0ppm R134A
PRES CHK 00485pk
0ppm R134A
PRES CHK is displayed when the monitor is performing an atmospheric pressure check, which is done to
ensure the accuracy of the gas measurement under varying atmospheric conditions. This pressure check
is performed every 30 minutes.
3.3.3. Function Screens
The Function screens are used to display stored data and to set up the monitor.
From the Data Display screen, press any Keypad button to display the first Function Menu screen.
Next, use the Keypad buttons to move the arrow (>) on the display until it is next to the desired function,
and then press the ENTER button to select that function.
>PPM LOG FAULTS
ALARMS
DIAGNOS
>LOG INT AUDALRM
LOOP
>GASTYPE SPILLVL
LEAKLVL EVACLVL
>P-CHK
CLOCK
>SILENCE ZONETMP
SQUELCH CAL
Once a function has been selected, use the Keypad to scroll through the displayed data or to change a
parameter associated with that function. Press ENTER to save newly entered parameters. Press the
QUIT button to return to the previous screen without saving.
Note that if no buttons are pressed within 90 seconds after selecting a function, the monitor returns to the
Data Display screen.
P/N: 3015-4256 Rev 11
19
Single Zone Gas Monitor
PPM LOG – Contains records of the last 200 measurements. Each
#025
425PPM @
record shows the measurement’s date, time, and ppm level. Note that
the interval at which the measurements are logged is determined by the
LOG INT function.
11/07/10
15:35
Use the Keypad Up and Down buttons to change the record number by
a factor of 1. Use the Right and Left buttons to change the record
number by a factor of 10. Press QUIT to return to the previous screen.
In the example on the right, record #025 shows that a level of 425 ppm
was measured on 11/07/10 at 15:35.
Note that the PPM Log can be cleared as described on page 25.
ALARMS – Contains records of the last 30 alarm events, with the
#03
SPILL @
monitor’s most recent alarm being shown when the Alarm screen is first
displayed. After 30 events have been recorded, the newest record
overwrites the oldest. Each record displays either LEAK, SPILL, or
EVAC including the date and time the alarm occurred. Use any of the
Keypad buttons to scroll through the other alarm records. Press QUIT to
return to the previous screen. Refer to page 22.
11/10/10
15:06
Note that the ppm levels at which alarms occur are set using the
LEAKLVL, SPILLLVL, and EVACLVL functions.
In the example on the right, record #03 shows that a spill event occurred
on 11/10/10 at 15:06.
FAULTS – Contains records of the last 30 fault events, with the
monitor’s current fault status being shown when the Fault screen is first
displayed. After 30 events have been recorded, the newest record
overwrites the oldest. Each record lists an event’s numeric fault code
plus the date and time the fault occurred. Use any of the Keypad
buttons to scroll through the other fault records. Press QUIT to return to
the previous screen. Refer to System Faults (page 23).
#15 <1000> @
11/10/10
12:37
4.26500v
<0000>
24.5cD
14.00psi
In the example on the right, record #15 shows that a Purge Flow Fault
<1000> occurred on 11/10/10 at 12:37.
DIAGNOS – Enters the diagnostic function. Press the Up Arrow
Keypad button to toggle between the monitor’s two diagnostic screens.
Refer to (page 26).
0.00002au 4.260v
GAS TYPE – Used to select of any one of the gas types listed for
SELECT GAS TYPE
monitoring. (See the gas library in the Specifications section.) Use the
Keypad to select the desired gas type, and then press ENTER to save
the selection and return to the previous screen.
LEAKLVL – Sets the Leak Alarm level, adjustable from 1 to 300 ppm.
Factory default is 100 ppm. Note that the Leak Alarm level cannot be set
higher than either the Spill or Evacuate Alarm levels. Refer to Appendix
for recommended alarm settings for other gases. Use the Keypad to set
the desired Leak Alarm level, and then press ENTER to save that level
and return to the previous screen.
20
0.4ppm
0.00
R134A
EDIT LEAK LEVEL
0100 PPM
P/N: 3015-4256 Rev 11
Single Zone Gas Monitor
SPILLLVL – Sets the Spill Alarm level, adjustable from no lower than
the Leak Alarm level to a maximum value of 500 ppm, but not higher
than the Evacuate Alarm level. Factory default is 300 ppm. Refer to
Appendix for recommended alarm settings for other gases. Use the
Keypad to set the desired Spill Alarm level, and then press ENTER to
save that level and return to the previous screen.
EVACLVL – Sets the Evacuate Alarm level, adjustable from no lower
than the Spill Alarm level to 9999 ppm. Factory default is 500 ppm.
Refer to Appendix for recommended alarm settings for other gases. Use
the Keypad to set the desired spill level alarm level, and then press
ENTER to save that level and return to the previous screen.
LOG INT – Sets the interval at which measurements are logged to
memory from 1 to 9999 minutes. Factory default is 10 minutes. Note that
the logged measurements can be viewed using the PPM LOG function.
Use the Keypad to enter the desired value, and then press ENTER to
save that value and return to the previous screen.
EDIT SPILL LEVEL
0300 PPM
EDIT EVAC LEVEL
0500 PPM
LOG INTERVAL IS
0010 min
LOOP – Adjusts the loop factor of the 4–20 mA current loop. Factory
EDIT LOOP FACTOR
default is 0.016 mA per ppm, which provides an output range of 0 ppm
(4 mA) to 1,000 ppm (20 mA). Use the Keypad to set the desired loop
factor, and then press ENTER to save that value and return to the
previous screen.
0.016 ma/PPM
To facilitate loop zero and span checking, note that when the LOOP
function is selected the loop output is set to 20 mA, and upon exiting this
function the loop output is set to 4 mA.
AUDALRM – Allows the monitor’s internal audible alarm to be
associated with any function of the monitoring system. Factory default is
OFF. Use the Keypad to select the desired audible alarm function, and
then press ENTER to save that value and return to the previous screen.
AUDIBLE ALARM IS
OFF
Audible Alarm Settings: OFF, ANY ALARM, SYSTEM FAULT, LEAK ALARM,
SPILL ALARM, EVAC ALARM, MONITOR STOPPED
NOTE: MONITOR STOPPED indicates there is a critical
system fault, and the monitor is no longer functioning
correctly.
CLOCK – Sets the monitor’s date and time. Use the Keypad to enter
the correct date and time, and then press ENTER to save those values
and return to the previous screen. Note that time is displayed in a
24 hour format, while the date is displayed as mm/dd/yy.
SET DATE & TIME
SILENCE – Used to enter a length of time for which the internal
SILENCE TIMEOUT
audible alarm and the external alarm are turned OFF when the front
panel SILENCE button is pressed. The factory default is 300 seconds
(5 minutes). If the cause of the alarm/fault has not been cleared at the
end of this time period, the internal audible alarm and the external alarm
device are reactivated. Use the Keypad to enter the desired time period,
and then press ENTER to save that value and return to the previous
screen.
P/N: 3015-4256 Rev 11
11/10/10
15:30
0300 sec
21
Single Zone Gas Monitor
SQUELCH – Sets a value of between 0.0 and 99.9 ppm that prevents
the display of measurements below that value. Factory default is 0 ppm.
For example, if the squelch setting is set to 50 ppm, then the monitor will
not display measurements that are below that value. Use the Keypad to
enter the desired value, and then press ENTER to save that value and
return to the previous screen.
SQUELCH BELOW
ZONETEMP – Used to enter the temperature of the area being
monitored in °C, thus giving a more accurate ppm reading. The factory
default is 25°C. Use the Keypad to enter the desired temperature, and
then press ENTER to save that value and return to the previous screen.
TEMP AT ZONE =
50.0ppm
25 degC
CAL – Used to change the monitor’s calibration factor. This function is
to be used ONLY with instructions from a Bacharach Service Center.
Factory default is 1.000.
R134A CALFACTOR
P-CHK – This Pressure Check function displays the current manifold
pressure and the stored ambient pressure in psia, along with the
difference between these two pressures and the current fault code.
14.72 * AMB14.81
1.000
0.0
3.4. Gas Alarms
3.4.1. Overview
If the selected gas ppm level in the area being monitored exceeds its preset Leak, Spill, or Evacuate
Alarm level (page 22), the SZ unit will detect this alarm condition and turn ON the front panel ALARM
light. Additionally, an external alarm device may activate and the monitor’s internal audible alarm may
sound if those features have been enabled (pages 14 and 22).
3.4.2. Clearing / Silencing a Gas Alarm
Once the gas-alarm circuit has been triggered all alarm indicators remain turned ON, even after the
detected gas level returns to normal. Press the SILENCE button to clear all gas-alarm indicators after the
cause of the alarm has been cleared and the detected gas level has dropped below all alarm levels.
Pressing the SILENCE button while a gas-alarm condition still exists causes the internal audible alarm
and all external alarm devices that are connected to the relays to turn OFF for a period of time as set by
the SILENCE function (page 22). This will allow ventilation equipment tied to the SPILL and EVAC relays
to continue operating. The front panel ALARM light remains ON, however, as an indication that an alarm
condition still exists, but will automatically turn OFF once the gas level returns to normal. The alarm circuit
will reactivate at the end of the silence period if the detected gas level is still above an alarm level.
3.4.3. Viewing the Gas Alarm Log
From the Data Display screen, use the Keypad buttons to place the arrow (>) on the display next to the
ALARMS function. Then press ENTER to display the alarm log.
The alarm log shows the type of alarm (LEAK, SPILL, or EVAC), plus the date and time it occurred. If
CLEAR is displayed, this indicates that an alarm was acknowledged at the date and time shown.
Immediately after selecting the ALARM function, the most recent alarm event is displayed. In the example
below, record #03 shows that a Spill Alarm occurred on 11/10/10 at 15:06. Note that if more than
30 alarm events have occurred, then the newest event overwrites the oldest. The Alarm Log can be
cleared as described on page 25.
#03
SPILL @
11/10/10
22
15:06
P/N: 3015-4256 Rev 11
Single Zone Gas Monitor
3.5. System Faults
3.5.1. Overview
If a system malfunction occurs, the SZ monitor will detect the problem and turn ON the front panel
SYSTEM FAULT light. Additionally, an external alarm device may activate and the monitor’s internal
audible alarm may sound if those features have been enabled (pages 14 and 22).
3.5.2. Clearing / Silencing a Fault Alarm
The SYSTEM FAULT light and all other fault indicators will automatically turn OFF after the cause of the
fault has been eliminated.
Pressing the SILENCE button while a fault condition still exists causes the internal audible alarm and the
external alarm device that is connected to the fault relay to turn OFF for a period of time as set by the
SILENCE function (page 22). The front panel SYSTEM FAULT light remains ON, however, as a reminder
that a fault condition still exists. The alarm circuit will reactivate at the end of the silence period if the
cause of the fault has not been corrected. The SYSTEM FAULT light will automatically turn OFF once the
fault has been cleared.
3.5.3. Viewing the Fault Log
From the Data Display screen, use the Keypad buttons to place the arrow (>) on the display next to the
FAULTS function. Then press ENTER to display the fault log.
#03 <0800> @
11/12/10
08:17
#04 <0000> @
11/12/10
08:30
FAULT CODE<1800>
12
ZONE FLOW
FAULT CODE<1800>
13
PURGE FLOW
The fault log shows the monitor’s current fault status. If the fault is still
present when the FAULTS function is selected, then the current cause of
the fault is displayed along with the date and time it occurred. If the cause
of the fault has been cleared, then the fault log will show <0000> along
with the date and time the fault was cleared. Use the keypad buttons to
scroll through the fault log. In the examples shown to the left, record #03
shows that a Zone Flow Fault (fault code <0800>) occurred on 11/12/10
at 08:17, while record #04 shows that the fault was cleared on 11/12/10 at
8:30.
The cause of the fault is identified by a numeric fault code. To convert the
fault code into a text description of the fault, first press the ENTER button
and then use the Keypad buttons to scroll through the display until the
text description of the fault appears. If the fault code is a combination of
two or more faults, then continue to use the Keypad buttons until all fault
text descriptions have been displayed. For example, the fault code
<1800> represents the combination of both a Zone Flow <0800> and a
Purge Flow <1000> fault as shown to the left.
Note that the Fault Log can be cleared as described on page 25.
P/N: 3015-4256 Rev 11
23
Single Zone Gas Monitor
3.5.4. Fault Codes
FAULT CODES ARE ADDITIVE. For example: A fault code of <1800> indicates that both a Purge Flow
Fault <1000> and a Zone Flow Fault <0800> have occurred.
Code
Name
Description
<0001>
Box Temperature
Fault
Enclosure temperature is outside normal range (or IR detector has
failed). Check that the monitor is not being subjected to extreme
temperatures. Verify that the ventilation holes are not obstructed.
Use the DIAGNOS function (page 26) to check the Box
Temperature.
<0002>
Bench
Temperature Fault
Optical bench is outside normal operating range (or IR detector has
failed). Check that the monitor is not being subjected to extreme
temperatures.
<0004>
Manifold Pressure
Fault
The manifold pressure is outside normal operating range (or IR
detector has failed). Enter the DIAGNOS function (page 26) and
record ALL data. Call the factory with this information for further
instructions.
<0010>
Loop Fault
The 4–20 mA current loop is open, or there is a high resistance in the
circuit. Check the wiring to the load/monitoring circuit. If this feature is not
being used, a 100 ohm resistor must be connected to the 4–20 mA
connector (page 16).
<0100>
Zero Filter Fault
There is gas present in the purge air. Locate the monitor in an area
containing fresh air, or install a purge air line. Refer to page 7.
<0200>
Gain Set Fault
The digipot autotune sequence has failed. This fault will only occur
on first boot up or after a firmware upgrade. Call the factory for
further instructions.
<0400>
A/D Fault
A fault has occurred in the analog-to-digital circuitry. Contact the
factory with this information for further instructions.
<0800>
Zone Flow Fault
Check for:
A kink in the gas-sample line or exhaust line; a blocked external
termination filter; a blocked internal hydrophobic filter (page 11); a
failed pump.
<1000>
Purge Flow Fault
Check for:
A kink in the purge line; a blocked external termination filter; a
blocked internal hydrophobic filter (page 11); a failed pump. Once
the blockage has been cleared, the monitor will return to normal
operation after the monitor completes a purge cycle.
24
<4000>
Zero Fault
The IR detector’s output voltage is out of tolerance. Enter the
DIAGNOS function (page 26) and record ALL data. Call the factory
with this information for further instructions.
<8000>
Clipping Fault
The detector voltage may be out of tolerance. Use the DIAGNOS
function (page 26) to check the IR detector voltage. Call the factory
with this information for further instructions.
P/N: 3015-4256 Rev 11
Single Zone Gas Monitor
3.6. Clearing the Stored PPM Log, Alarm and Fault Data
Up to 200 gas measurements, and 30 alarm and fault events are stored by the monitor.
To clear stored data, first display the data to be cleared by using the PPM LOG, ALARMS or FAULTS
function (page 22). Next, press the Right Arrow Keypad and ENTER buttons at the same time. A single,
long tone should be heard when the data has been successfully cleared.
3.7. Reset to Factory Default Settings
IMPORTANT! Performing this function will delete all program parameters, alarms, faults,
and ppm log files.
With AC power removed from the monitor, press and hold down the Factory Default Switch (pages 10
and 11). Apply AC power and listen for a beep and then a long tone. Release switch. At this time the
monitor will purge the IR bench and auto set the IR detector voltage to its baseline 0 ppm value.
After warming up, reprogram the SZ monitor to the desired settings as needed.
3.8. The P-CHK Function
3.8.1. Overview
The P-CHK function (Pressure Check Function) (page 22) is useful to a service technician for
troubleshooting a flow fault problem. The monitor will trigger a flow fault if the pressure drop from ambient
is less than 0.02 psi during a purge cycle, and 0.06 psi during a measurement cycle.
3.8.2. Keypad Functions
From the Data Display screen, use the Keypad buttons to place the arrow (>) on the display next to the
P-CHK function. Then press ENTER to display the Pressure screen.
The Left Arrow Keypad button toggles the purge valve open and closed. Note that an asterisk ()
appears when the purge valve is open (purging).
The Down Arrow Keypad button toggles the pump ON and OFF.
Pressing the ENTER button stores the current manifold pressure shown on the left to the ambient
pressure shown on the right (must be done with the pump OFF).
3.8.3. Screen Display
14.72 * AMB14.81
0.09dif
<0000>
Manifold Pressure

Stored Ambient Pressure
Pressure Difference
Fault Code
Manifold Pressure – Current manifold pressure in psia.
Stored Ambient Pressure – Stored ambient pressure in psia.
Pressure Difference – The difference between the current manifold pressure and the stored ambient
pressure.
Fault Code – Current fault code (page 23).
Purge Valve Asterisk () – When viewing the Pressure screen, the purge valve can be opened and
closed by pressing the Left Arrow Keypad button. An asterisk appears on the display when the purge
valve is open.
P/N: 3015-4256 Rev 11
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Single Zone Gas Monitor
3.9. The DIAGNOS Function
3.9.1. Overview
The DIAGNOS function displays sensor data and status information useful to a service technician for
troubleshooting various fault conditions. Explanations of the data shown in these screens are given
below.
3.9.2. Keypad Functions
From the Data Display screen, use the Keypad buttons to place the arrow (>) on the display next to the
DIAGNOS function. Then press ENTER to display the first of two Diagnostic screens.
Press the Up Arrow Keypad button to toggle between the First and Second Diagnostic screen.
3.9.3. First Diagnostic Screen
4.26500v
<0000>
Bench Voltage
Fault Code
24.5cD* 14.72psi
Detector Temperature °C  Manifold Pressure
0.00250n
Noise
<0000>
29.5cB* 14.72psi
Fault Code
 Manifold Pressure
Box Temperature °C
In the first diagnostic screen, the user can toggle between displaying the Bench Voltage / Noise and
Detector Temperature / Box Temperature by pressing the Right Arrow Keypad button.
Bench Voltage – This is the current peak-to-peak output of the IR detector. In the absence of gas this
value can range from 3.90000V to 4.50000V.
Noise – The Noise value is a 16 point running average of the noise portion of the IR detector’s output.
This reading is valuable mainly when refrigerant is NOT present.
Detector Temperature – This is the current detector temperature in °C.
Box Temperature – This is the current internal enclosure temperature in °C.
Fault Code – Current fault code. A value of <0000> indicates that no faults are being detected.
Manifold Pressure – Current manifold pressure in psia.
Purge Valve Asterisk () – The purge valve can be opened and closed by pressing the Left Arrow
Keypad button. An asterisk appears on the display when the purge valve is open.
3.9.4. Second Diagnostic Screen
0.4ppm
0.00
0.00002au*4.260v
PPM Level
Avg. Absorption Unit
µMole/Liter

Detector Voltage
PPM Level – Parts Per Million Level is the current detected gas level, and is the volume concentration
referenced to standard temperature and pressure.
Average Absorption Unit – This is the optical absorbency. In the absence of gas the absorbency is
0.00000 au. When sampling selected gas, its value varies proportionally with the concentration.
µMoles/Liter – This is the absolute concentration in micro-moles per liter of gas.
Detector Voltage – This is a running average of the IR detector’s bench voltage as displayed in the First
Diagnostic screen.
Purge Valve Asterisk () – When viewing the diagnostic screen, the purge valve can be opened and
closed by pressing the Left Arrow Keypad button. An asterisk appears on the display when the purge
valve is open.
26
P/N: 3015-4256 Rev 11
Single Zone Gas Monitor
3.10. The Calibration Function
3.10.1.
Overview
If greater than standard accuracy is desired, the factory’s default calibration factor of 1.000 may be
adjusted by performing the calibration procedure as described below, and then selecting the monitor’s
CAL function to enter the new calibration factor.
IMPORTANT! Changing the calibration factor will VOID the factory calibration. Typically, the
monitor 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.
3.10.2.
Calibration Procedure
The calibration factor is determined by sampling a known dilution of gas. 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, 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 a certified calibration gas must be used to ensure sampling occurs at ambient conditions.
A minimum sample size of 5 liters is required.
The SZ unit should be operating for at least one hour prior to performing a calibration.
Prepare the SZ for sampling by using the CAL function to set the calibration factor to 1.000. Also, use the
LOG INT function to set the log interval to 1 minute.
With the SZ monitor operating normally, connect the gas-sample bag directly to the gas-inlet port and
allow the monitor to sample the entire bag. When sampling is complete, view the logged ppm values
using the PPM LOG function. If the bag was large enough for multiple samples, average the most stable
ones. The new calibration factor is computed by dividing the known gas concentration value by the
measured value. Typically this number will be between 0.95 and 1.05. Use the CAL function as
described below to enter the new calculated calibration factor.
3.10.3.
Adjusting Calibration Factor
From the Data Display screen, use the Keypad buttons to place the arrow (>) on the display next to the
CAL function. Then press ENTER to display the Calibration screen.
R134A CALFACTOR
1.000
With the Calibration screen displayed, use the Keypad buttons to enter the new calibration factor.
Press ENTER to save this value.
P/N: 3015-4256 Rev 11
27
Single Zone Gas Monitor
SECTION 4. MAINTENANCE
4.1. Warnings and Cautions
WARNING: Always disconnect AC power before working inside the monitor.
CAUTION: When working inside the monitor, be very careful not to dislodge any electrical
wiring or pneumatic tubing. The SZ monitor contains sensitive electronic components that
can be easily damaged. Be careful not to touch or disturb any of these components.
4.2. Charcoal Filter (Halogen Gas Monitor Only)
The Charcoal Filter (see Figure 2-4 on page 11) removes refrigerant gas from the purge-air stream during
the purging process. Replace the charcoal filter (P/N 3015-4306) about every 6 months, when a zero filter
fault occurs (fault code <0100>), or after the monitor itself has been exposed to unusually high levels of
refrigerant gas, such as after an evacuation alarm.
4.3. Hydrophobic Filters
Hydrophobic Filters (see Figure 2-4 on page 11 and Figure 2-5 on page 12) located in both the gassample and purge lines prevent water from entering the IR detector. A zone flow fault will occur (fault
code <0800>) if the gas-sample filter becomes blocked, while a purge flow fault will occur (fault code
<1000>) if the purge filter becomes blocked. Replace the appropriate filter as required (P/N 0007-1650).
4.4. Servicing Air Lines and Termination Filters
The gas-sample line and the optional purge and exhaust lines should be periodically checked for obvious
signs of kinks, damage, and contamination. Replace the tubing as required.
The gas-sample line and purge-line termination filters prevent dust and dirt from entering the monitor.
Both of these 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, while a purge flow fault will occur (fault code <1000>) if the purge-line filter becomes blocked. To
service the filter, simply remove it from the line and replace it with a new one (P/N 3015-3420).
4.5. End-of-Line Water Stop (Optional)
The end-of-line water stops (P/N 3015-5512) prevent contaminates and moisture from entering the
monitor. This filter should be periodically checked and replaced when there are obvious signs of
contamination.
4.6. Water Trap (Optional)
The water trap removes moisture that enters tubing before allowing it to enter the internal components of
the SZ unit. The water trap should be emptied often as condensate accumulates. The water trap filter
should be periodically checked and replaced when there are obvious signs of contamination.
4.7. Fuses
The SZ monitor is protected from electrical damage by two, 1 A, 250 V, type “F” fuses (page 11).
Carefully remove the fuses from their fuse clips and visually inspect each fuse for damage. Replace the
fuses as required (P/N 0004-2620).
P/N: 3015-4256 Rev 11
28
4.8. Clock Battery
The Clock Battery (page 11) maintains the correct date and time when AC power is not applied to the
monitor. Replace this battery about every 5 years (P/N 0204-0020).
4.9. Sample Pump
The Sample Pump (page 11) draws the gas sample into the monitor, through the IR detector, and
discharges the sample out the monitor’s exhaust port. When replacing the pump, remove its inlet and
outlet tubing, disconnect the AC power wires from the pump itself, and remove pump from monitor. Install
a new sample pump (P/N 3015-5176).
4.10. Replacement Parts and Optional Accessories
REPLACEMENT PARTS
P/N
OPTIONAL ACCESSORIES
P/N
General
P/N
General
P/N
HGM-SZ complete assembly
3015-4200
Splitter Kit (2-way)
3015-5404
AGM-SZ complete assembly
3015-4280
Splitter Kit (3-way)
3015-5405
Panasonic CR2032, 3V Battery
0204-0020*
Variable Flow Regulator
3015-3849
Fuse: 1.0 A, 250 V, Type “F”
0004-2620
Annual Maintenance Kit
3015-5529
IR Bench Replacement Kit (HGM)
3015-4572
Surge Protectors
IR Bench Replacement Kit (AGM)
3015-4492
120 V
3015-4121
Display Board
3015-5520
230 V
3015-5530
Universal Power Supply
3015-5523
4-20 mA
3015-4123
Power Entry PC Board
3015-5524
Water Traps and Options
P/N
Main PCB Board Replacement
3015-5478
Water Trap, Manual Drain
0007-1655
Replacement Pump
3015-5176
Replacement Filter
0007-1656
Mounting Bracket
0007-1657
3015-5512
Filters
P/N
P/N
Charcoal, Zero Air
3015-4306
End of Line Water Stop Filter
Hydrophobic
0007-1650
Alarms
Termination, Line End Assembly (gas
sample line)
3015-3420
Line End (Filter Only)
3015-2906
Tubing
120 VAC
Audible/
Visual
P/N
¼ in OD - (for HGM) by the foot
0304-2743
¼ in OD - (for AGM) by the foot
0304-2742
P/N
Audio
Alarm
3015-3076
9-28
VDC
Surface Mount
3015-5490
Panel Mount
3015-5491
9-28
VDC
Surface Mount
3015-5492
Panel Mount
3015-5493
Gases
* See Warning below.
Gas Cylinder 1031
(100 PPM)
Gas Verification
Kit
P/N
R-22
3015-3850
R-134a
3015-3851
R-123
3015-3852
R-22
3015-3430
R-134a
3015-3437
R-123
3015-3438
WARNING: In compliance with agency approvals and safety regulations, the battery must
be replaced with the specified Bacharach replacement part.
P/N: 3015-4256 Rev 11
29
Single Zone Gas Monitor
4.11. Service Centers
Replacement parts and service can be obtained by contacting one of the following Bacharach Service
Centers.
United States
Bacharach, Inc.
621 Hunt Valley Circle
New Kensington, PA 15068-7074
Phone: 724-334-5000, 800-736-4666
Fax: 724-334-5723
Email: [email protected]
Canada
Bacharach of Canada, Inc.
20 Amber Street Unit #7
Markham, Ontario L3R 5P4 Canada
Phone: 905-470-8985
Fax: 905-470-8963
Email: [email protected]
Europe
Murco Limited – a Bacharach Company
114a Georges Street Lower
Dun Laoghaire
Co. Dublin
Ireland
Phone: 353 1 284 6388
Fax:
353 1 284 6389
Email: [email protected]
APPENDIX A. DATA TABLES
A.1. Recommended Alarm Settings
Refrigerant
Leak PPM
Spill PPM
Evacuate PPM
R11
100
300
500
R12
100
300
500
R22
100
300
500
R23
100
300
500
R113
100
300
500
R114
100
300
500
R123
25
35
50
R124
100
300
500
R134A
100
300
500
R401A
100
300
500
R402A
100
300
500
R402B
100
300
500
R404A
100
300
500
R407A
100
300
500
R407C
100
300
500
R409A
100
300
500
R410A
100
300
500
R500
100
300
500
R502
100
300
500
R503
100
300
500
R507
100
300
500
R508B
100
300
500
500
H1301
100
300
R408A
100
300
500
FA188
100
300
500
R236FA
100
300
500
N1230
100
300
500
R227
100
300
500
HFP
100
300
500
FC72
100
300
500
R21
100
300
500
R125
100
300
500
H1211
100
300
500
H2402
100
300
500
R245FA
100
300
500
R422A
100
300
500
R422D
100
300
500
R427A
100
300
500
HFO01234YF
100
300
500
R424A
100
300
500
R426A
100
300
500
Ammonia/NH3/R717
100
300
500
P/N: 3015-4256 Rev 11
31
Single Zone Gas Monitor
A.2. Response Time/Flow Rate
Gas-Sample Line
Feet (Meters)
Response Time
Seconds (HGM)
Response Time
Seconds (AGM)
0
100 (30.5)
200 (61)
300 (91.4)
400 (123)
500 (152.4)
0
20
40
56
80
105
0
40
60
90
120
180
Dependent on gas-sample line length; 0.25" OD x 0.17" ID tubing.
APPENDIX B. AGENCY APPROVALS
European Standard EN14624: 2005 testing with R-134a (Halogen Gas Monitor Only).
Min. Sensitivity Threshold
1 ppm
Max. Sensitivity Threshold (within 1 ppm ± 10% reading accuracy range)
1,000 ppm
Max. Sensitivity Threshold within Instrument Reading Range
10,000 ppm
Zeroing Time from 1,000 ppm*
<12 seconds
Zeroing Time from 10,000 ppm*
<25 seconds
Reaction Time for detection of minimum threshold*
≤12 seconds
Min. Sensitivity threshold once max. threshold has been measured
1 ppm
Repeatability at 500 ppm
± 1% of reading
* Based on a minimum tubing length of one foot
P/N: 3015-4256 Rev 11
33
Single Zone Gas Monitor
  
P/N: 3015-4256 Rev 11
35
Single Zone Gas Monitor
Headquarters:
621 Hunt Valley Circle, New Kensington, PA 15068-7074
Toll Free: 800-736-4666 • Tel: +1-724-334-5000 • FAX: +1-724-334-5001
Website: www.MyBacharach.com • E-mail: [email protected]
Printed in U.S.A.
® Registered Trademark of Bacharach Inc.
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