Single Zone Gas Monitors
HGM-SZ (Halogen) and AGM-SZ (Ammonia)
Instruction 3015-4256
Installation / Operation / Maint e na nc e
Rev 13 – January 2013
Product Leadership • Training • Service • Reliability
Patent 6,590,690
UL 61010-1
CSA 22.2 No. 61010-1
EN 14624
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 satisfacti on
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 inst ruction 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 © 2005-2012, 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.
ii P/N: 3015-4256 Rev 13
Single Zone Gas Monitor
Table of Contents
SECTION 1. INTRODUCTION..................................................................................................................... 1
1.1. How to Use This Manual..................................................................................................................... 1
1.2. Warning Statements ........................................................................................................................... 1
1.3. Caution Statements ............................................................................................................................ 1
1.4. Hazard Symbols Located on the Monitor ........................................................................................... 1
1.5. 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 and Use .................................................................................................. 3
1.6.2. Understanding Monitor ing 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 ................................................................................................ 10
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
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Single Zone Gas Monitor
3.4.1. Overview ................................................................................................................................ 22
3.4.2. Clearing / Silencing a Gas Alarm .......................................................................................... 22
3.4.3. Viewing the Gas Alarm Log ................................................................................................... 22
3.5. 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
3.6. Clearing the Stored PPM Log, Alarm and Fault Data ....................................................................... 25
3.7. Reset to Factory Default Settings ..................................................................................................... 25
3.8. The P-CHK Function ......................................................................................................................... 25
3.8.1. Overview ................................................................................................................................ 25
3.8.2. Keypad Functions .................................................................................................................. 25
3.8.3. Screen Display ...................................................................................................................... 25
3.9. 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
3.10. 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. Warnings and Cautions .................................................................................................................... 28
4.2. Charcoal Filter (Halogen Gas Monitor Only) .................................................................................... 28
4.3. Hydrophobic Filters ........................................................................................................................... 28
4.4. Servicing Air Lines and Termination Filters ...................................................................................... 28
4.5. Fuses ................................................................................................................................................ 29
4.6. Sample Pump ................................................................................................................................... 29
4.7. End-of-Line Water Stop (Optional) ................................................................................................... 29
4.8. Water Trap (Optional) ....................................................................................................................... 29
4.9. Clock Battery .................................................................................................................................... 29
4.10. Replacement Parts and Optional Accessories ................................................................................. 30
4.11. Service Centers ................................................................................................................................ 31
APPENDIX A. DATA TABLES .................................................................................................................. 32
A.1. Recommended Alarm Settings ........................................................................................................... 32
A.2. Response Time/Flow Rate ................................................................................................................. 33
APPENDIX B. AGENCY APPROVALS .................................................................................................... 34
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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 work ing knowledge of gas monitors, yo u will find this m anual useful as a ref erence tool. If
you are new to the use of gas monitors, you can educate yourself about the princ iples 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 th is manual denotes a potentia l hazard associated with the us e 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 t his manual denote s a potential hazard assoc iated 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 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 enclosure is opened.
WARNING: To avoid risk of injury from electric s hock, do not open the enc losure 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
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.
WARNING: The Single Zone gas monitor is not to be used in any application that is
beyond its intended purpose or beyond the scope of its specifications. Failure to follow
this warning can result in personal injury or damage to the equipment. For details on
appropriate use, refer to the general description, application, and operation discussions in
this manual.
use it in hazardous (classified)
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Single Zone Gas Monitor
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. E xplos ive 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 th e 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 wat er .
Single Zone Gas Monitor
1.6. Functional Overview
1.6.1. Ge neral Description and Use
Single zone gas m onitors are specified to support com pliance 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 pres ence of gas in an area that is loc at ed up t o
500 ft (152.4 m) away from the monitor. The SZ monitor displa ys the type of gas being monitored, a long
with displa ying both the c urrent gas level and the peak gas level detected in t hat area on its f ront panel
LCD. The monitor retains a log of previous readings that can be easily accessed for analysis.
An audible alarm and front panel i ndicators are provided to signal alarm and fault cond itions, and relay
contacts are provided th at can be used t o trigger ex ternal alarm devices in the event of a system f ault, or
if a leak (sm all), sp ill (m edium ), or evacuati on (lar ge) l evel of gas is d etecte d. Th e s ystem also inc ludes 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 incorpor ates active diagnostics that continuou sly check the system for proper operation. A front
panel indicator is provided to alert an o per at or of system malfunctions, and fau lt c odes 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 c alls if the alarm levels are set at pract ical 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 recomm ended alarm levels will satis fy the needs of most user s.
However, the ppm levels generated by system leaks into t he environment are great ly influenced by the
volume of air in the sam pling area, air cir culation, s ize of the leak , distance t o the m onitoring poi nt, and a
host of other variables. In s ome cases the alarm set points ma y need to be adjusted ei ther up or do wn 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 di lution of the orig inal concentration. T he SZ monitor m easures the gas concentration
at the point the sam ple is collected. Therefore, if th e termination of th e 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 an d amm onia gases are cold, th ey are heaver than air and settle
below the leak point. When the gas warms to room temper ature, it becomes light er than air and t ends to
collect above the leak point. Consequently, t he sampling point s hould 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 outsid e of the m echanical room or just inside a doorway to the room.
This is the “split arc hitecture desi gn” for safety of the operator. The m onitor should be r eadily 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 m onitor is not well ventilated, the n an optional exha ust line and
purge line can be run to an outs ide location. The total le ngth of the exhaust line + the pur ge line cannot
exceed 200 ft (61.0 m).
It may be necessary to perform a “smoke” test of the mechanical r oom to determine the best monitoring
point. The smoke test would provide the pattern of air currents present in the room.
The SZ monitor shou ld be k ept dry. W hen used in a wet or humid area, it is h ighly recom mended 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
Single-zone infrared monitoring system for low level continuous monitoring of CFC, HCFC
Product Type
Gas Library:
CFC
HFC
HCFC
HALON
Other
Sensitivity
Measuring
Range
Accuracy
Response Time
and HFC ref rigerant gass es used in mos t commercial re frigeration systems. System design
supports compliance to the refrigerant monitoring requirements of ANSI/BSR ASHRAE 152007 and ASHRAE Safety Code 34-2007.
HFP, R-11, R-113, R-114, R-12, R-502
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)
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
All gasses 1 ppm
All gasses 0 to 10,000 ppm
±1 ppm ±10% of reading from 0-1000 ppm
(R11, R22, R113: ±10 ppm ±15% of reading 0-1000 ppm)
105 seconds maximum (depe ndent on sample line length)
Single Zone Gas Monitor
Category AGM-SZ Specifications
Product Type
Gas Library
Sensitivity
Measuring Range
Accuracy
Response Time
Single zone infrared monitoring system for low level continuous monitoring of ammonia
refrigerant gas used in most commercial refrigeration systems.
Ammonia / NH
20 PPM (minimum detection limit)
25-10,000 PPM
±10 ppm ±10% of reading from 25 to 1,000 ppm
180 seconds maximum (depe ndent on sample line length)
/ R-717
3
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Single Zone Gas Monitor
Category General Single Zone Specifications
Coverage
Detector Type
Warm-up Time
Single zone
Infrared, Non-Dispersive
15 minutes
3 Indicator lights:
• Green Monitor is powered on. LED glows during normal operation; flashes
Front Panel
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 (HxWxD)
Weight
Temperature Drift
Sampling Mode
Re-Zero
System Noise
Monitoring Distance
Conditioned Signal
7.5" x 13.5" x 3.625" (190.5 mm x 343 mm x 92 mm)
5.5 lbs (2.5 kg)
Less than 1 ppm per °C betw een purge cy cle s
Automatic (continuous)
Automatic (approximately every 5 minutes)
Less than 50 dB(A) @ 10 feet (3m)
500 ft. (152 m) maximum
4-20 mA DC non-isolated output (ppm)
Four SPDT alarm contacts are provided rated 2A at 250 VAC (inductive), 5 A at
Alarms
250 VAC (resistive)
Three assigned to PPM level alarms, one assigned to system faults
Power Safety Mode
Operating Temp
Ambient Humidity
AC Power
Certification
Warranty
Altitude Limit
Sensor Life
Fully automatic system reset. All programmed parameters retained.
32 to 122 °F (0 to 50 °C)
5% to 90% RH (non-condensing)
100 to 240 VAC, 50/60 Hz, 15 Watts
UL 61010-1, CAN/CSA 22.2 No. 61010-1 and CE Mark
2 years from date of shipment
6,562 ft (2,000 m) maximum
7-10 years
6 P/N: 3015-4256 Rev 13
SECTION 2. INSTALLATION
Shock hazard! Always disconnect AC power before working inside
2.1. Installation Considera t ions
2.1.1. Warnings and Cautions
WARNING: Explosi on 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:
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.
Single Zone Gas Monitor
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 r e-checked prior to i nstallation. Inspec t the outside
of the enclosure to mak e 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 loca tion that will re quire no more than 500 f t (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 m onitor
should be located in an area that nor mall y does not contain gas. If an ex haust line is not used, locate th e
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 shou ld be operated in an environm ent that is between 32 and 122°F (0 and 50°C); h as 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 sh ould also be r elatively free of dirt, grease, and o ils that could adversely aff ect 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 tem plate. 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 agains t the m ounting s urfac e and allo w it to slid e down enga ging the s crew heads in
the keyhole slots of the mounting brac kets. Adjust th e screws as nec essary to hold the monitor secur ely
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.
* There is an additional service knockout on top of the case.
8 P/N: 3015-4256 Rev 13
Figure 2-2. HGM-SZ Monitor Bottom View
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