Bacharach HGM-SZ Operating Manual

Single Zone Gas Monitors

HGM-SZ (Halogen) and AGM-SZ (Ammonia)

Instruction 3015-4256

Installation / Operation / Maintenance

Rev 14 – May 2014

Patent 6,590,690

CSA 22.2 No. 61010-1

Product Leadership • Training • Service • Reliability

UL 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 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 © 2005-2014, 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. 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 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 ................................................................................................ 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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3.4.1. Overview ................................................................................................................................ 22

3.4.2. Clearing / Silencing a Latching Gas Alarm ............................................................................ 22

3.4.3. Viewing the Gas Alarm Log ................................................................................................... 23

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 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 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 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,
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.

DO NOT use it in hazardous (classified)

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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.

Single Zone Gas Monitor

1.6. Functional Overview

1.6.1. General Description and Use

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

4 P/N: 3015-4256 Rev 14

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 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.

HFP, R-11, R-113, R-114, R-12, R-502

R-125, R-134a, R-236FA, R-245Fa, R-32, R-404a (HP62), R-407a, R-407c (AC9000),
R-407f, 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, HFO1234ZE, N1230, N7100, N7200, N7300, N7600, 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 (dependent 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 (dependent 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

Front Panel

Size (HxWxD)

Weight

Temperature Drift

Single zone

Infrared, Non-Dispersive

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

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 between purge cycles

Sampling Mode

Re-Zero

System Noise

Monitoring Distance

Conditioned Signal

Alarms

Power Safety Mode

Operating Temp

Ambient Humidity

AC Power

Certification

Warranty

Altitude Limit

Sensor Life

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

250 VAC (resistive)
Three assigned to PPM level alarms, one assigned to system faults

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 14

SECTION 2. INSTALLATION

Shock hazard! Always disconnect AC power before working inside

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:
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 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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Single Zone Gas Monitor

To remove tubing from a PTC

simultaneously withdraw the tubing.

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.

The Single Zone monitor uses push-to­connect (PTC) style connectors.

To insert sample lines, firmly push the
appropriate tubing into the hole in the
center of the connector until it seats in
the connector. Refer to the figures at
the left.

connector, push and hold the spring­loaded collar inwards, then

Refer to the figures at the right.

Figure 2-3. Using PTC Connectors: Connecting (Left) and Disconnecting (Right)

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Single Zone Gas Monitor

exhaust line terminates outside the building,

require a termination filter.

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

position the tubing so that no water or moisture
can enter the line. Note that this line does not

Figure 2-4. 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. (Use upgrade
kit 3015-5716 to convert an SZ with an internally mounted filter to an SZ with an externally mounted filter.)
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 3015-

5512) 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 14

2.4. Interior Schematic (Halogen HGM)

Single Zone Gas Monitor

Figure 2-5. 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 14 11

Single Zone Gas Monitor

2.5. Interior Schematic (Ammonia AGM)

Figure 2-6. 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 14

Single Zone Gas Monitor

Using the supplied crimp-on

AC power ground wire

Input Ground Stud, and

between the ground stud

be located in close
proximity to the monitor,

the monitor’s main AC

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.

ring terminals, washers, and
nuts, connect the incoming

(green) to the monitor’s AC

then install a separate wire

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

and be in easy reach of the
operator. This switch should
also be clearly marked as

disconnect device.

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.

Figure 2-7. AC Power Connections

WARNING: Copper conductors for connection to supply mains must be made in

accordance with NEC/CEC and local codes.

P/N: 3015-4256 Rev 14 13

CAUTION: Drilling holes in the SZ enclosure may damage the unit and will void the
warranty. Please use knockouts provided for electrical connections.

Single Zone Gas Monitor

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 Leak Alarm Point 100 ppm
Relay #2 Spill Alarm Point 300 ppm
Relay #3 Evacuate Alarm Point 500 ppm
Relay #4 Fault 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 2-8. 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 2-9, power to this device is being tapped off the monitor’s AC input. In Figure 2-10, power is
supplied from an external power source

14 P/N: 3015-4256 Rev 14

Single Zone Gas Monitor

Figure 2-9. Typical AC External Alarm Relay 1 Wiring

Figure 2-10. Typical DC External Alarm Relay 1 Wiring

P/N: 3015-4256 Rev 14 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 24).

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 2-11. 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 14

SECTION 3. OPERATION

Keypad

any of three preset alarm points.

Display Screen

3.1. Front Panel Display and Controls

Single Zone Gas Monitor

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

Figure 3-1. Front Panel Display and Controls

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.

P/N: 3015-4256 Rev 14 17

Single Zone Gas Monitor

Once the SZ monitor has been installed, set up, and powered ON, the

tervention. The results of those

3.2. General Operation

monitor will make measurements in the area being sampled for desired
gas without further operator in

MEASURE 00485 pk
45ppm R134A

measurements are shown on the front panel display.

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 24), 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 14

3.3. Display Screens

During normal operation, the Data Display screen shows when the

134A (refrigerant gas), and that a peak

SQUELCH CAL

ALM ACK

LOOP CLOCK

0ppm R134A

0ppm R134A

0ppm R134A

VERSION x.xx

ALARMS DIAGNOS

LEAKLVL EVACLVL

3.3.1. Initial Power Up

Single Zone Gas Monitor

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

WARM UP

3.3.2. Data Display Screen

monitor is performing the following three functions:

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 R­measurement of 485 ppm has occurred.

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.

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.

MEASURE 00485pk

PURGE 00485pk

PRES CHK 00485pk

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

>GASTYPE SPILLVL

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.

>LOG INT AUDALRM

>SILENCE ZONETMP

>P-CHK

P/N: 3015-4256 Rev 14 19

Single Zone Gas Monitor

events have been recorded, the newest record

recorded, the newest record

0100 PPM

R134A

0.00002au 4.260v

24.5cD 14.00psi

11/10/10 12:37

11/10/10 15:06

11/07/10 15:35

PPM LOG – Contains records of the last 200 measurements. Each

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.

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

monitor’s most recent alarm being shown when the Alarm screen is first
displayed. After 30
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

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.

22.

#025 425PPM @

#03 SPILL @

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
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

In the example on the right, record #15 shows that a Purge Flow Fault
<1000> occurred on 11/10/10 at 12:37.

23).

DIAGNOS – Enters the diagnostic function. Press the Up Arrow

Keypad button to toggle between the monitor’s two diagnostic screens.

Refer to (page 26).

GAS TYPE – Used to select of any one of the gas types listed for

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.

#15 <1000> @

4.26500v <0000>

0.4ppm 0.00

SELECT GAS TYPE

EDIT LEAK LEVEL

20 P/N: 3015-4256 Rev 14

Single Zone Gas Monitor

nternal audible alarm to be

0300 sec

11/10/10 15:30

OFF

0.016 ma/PPM

0010 min

0500 PPM

0300 PPM

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.

LOOP – Adjusts the loop factor of the 4–20 mA current loop. Factory

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.

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.

EDIT SPILL LEVEL

EDIT EVAC LEVEL

LOG INTERVAL IS

EDIT LOOP FACTOR

AUDALRM – Allows the monitor’s i

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 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.

SILENCE – Used to enter a length of time for which the internal

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.

AUDIBLE ALARM IS

SET DATE & TIME

SILENCE TIMEOUT

P/N: 3015-4256 Rev 14 21

Single Zone Gas Monitor

until the alarm condition has been manually

MANUAL

0.0

1.000

25 degC

50.0ppm

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.

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.

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.

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.

ALM ACK – The ALM ACK (alarm acknowledgement) function

programs the alarm light and audible alarm for latching or non-latching
operation. Use the up and down arrow keys to toggle between the two
settings.

AUTO: Non-latching (The alarm light and buzzer will automatically

shut off when the gas level drops below its alarm set point).

MANUAL: Latching (The alarm light and buzzer remain on and will not

shut off
acknowledged.)

3.4. Gas Alarms

SQUELCH BELOW

TEMP AT ZONE =

R134A CALFACTOR

14.72 * AMB14.81

ALM ACK MODE

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 Latching 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) if the ALM ACK function is set to MANUAL. 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. If the ALM ACK function is set to AUTO, the alarm relay will
automatically de-energize when the gas level drops below its alarm set point.

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. 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.

22 P/N: 3015-4256 Rev 14

Single Zone Gas Monitor

11/10/10 15:06

11/12/10 08:17

12 ZONE FLOW

13 PURGE FLOW

11/12/10 08:30

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 @

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> @

#04 <0000> @

FAULT CODE<1800>

FAULT CODE<1800>

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.

P/N: 3015-4256 Rev 14 23

Single Zone Gas Monitor

to check the Box

Note that the Fault Log can be cleared as described on page 25.

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

<0002> Bench

Temperature Fault

<0004> Manifold Pressure

Fault

<0010> Loop Fault The 4–20 mA current loop is open, or there is a high resistance in the

<0100> Zero Filter Fault Indicates contamination in the purge air, or (if a charcoal filter is in

<0200> Gain Set Fault The digipot autotune sequence has failed. This fault will only occur

<0400> A/D Fault A fault has occurred in the analog-to-digital circuitry. Contact the

<0800> Zone Flow Fault Check for:

<1000> Purge Flow Fault Check for:

<4000> Zero Fault The IR detector’s output voltage is out of tolerance. Enter the

<8000> Clipping 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
Temperature.

Optical bench is outside normal operating range (or IR detector has
failed). Check that the monitor is not being subjected to extreme
temperatures.

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.

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).

use) the filter may need to be changed. Refer to page 7.

on first boot up or after a firmware upgrade. Call the factory for
further instructions.

factory with this information for further instructions.

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.

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.

DIAGNOS function (page 26) and record ALL data. Call the factory
with this information for further instructions.

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.

)

24 P/N: 3015-4256 Rev 14

Single Zone Gas Monitor

0.09dif <0000>

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

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.

Manifold Pressure ∗ Stored Ambient Pressure

Pressure Difference Fault Code

Fault Code – Current fault code (page 24).

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 14 25

Single Zone Gas Monitor

24.5cD* 14.72psi

Bench Voltage Fault Code

29.5cB* 14.72psi

Noise Fault Code

Box Temperature °C ∗ Manifold Pressure

0.00002au*4.260v

PPM Level µMole/Liter

Avg. Absorption Unit ∗ Detector Voltage

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>

0.00250n <0000>

Detector Temperature °C ∗ Manifold Pressure

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

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 14

Single Zone Gas Monitor

1.000

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

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.

pressure changes in order to keep the unit within factory accuracy specifications.

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

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 14 27

SECTION 4. MAINTENANCE

During normal operation, the Single Zone monitor performs a purge cycle during

Use upgrade kit 3015-5716 to convert an SZ with internally mounted filter to an SZ with an external filter.

4.1. Warnings and Cautions

WARNING: Shock Hazard! Always disconnect AC power before working inside the

monitor.

WARNING: Before performing any operation or maintenance, verify connection of the AC
power ground wire to the monitor’s ground stud. Under no circumstances should this
monitor be operated or serviced 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

4.2. Charcoal Filter (Halogen Gas Monitor Only)

equipment.

WARNING: Electrical installation should be performed by a certified electrician and must
comply with all applicable NEC/CEC and local electrical safety codes.

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.

Single Zone Gas Monitor

which fresh air is drawn in from the purge line to flush internal components of any
residual refrigerants. Purge lines should draw in fresh outside air to perform the
purge function. When access to outdoor air is impractical, purge lines may begin
indoors, however a charcoal filter must be used on the purge line to ensure that no
contaminated air is drawn into the system during purge cycles. The charcoal filter
(which is mounted outside of the enclosure using the included bracket) removes
refrigerant gas from the purge-air stream during the internal purging process.

Replace the charcoal filter (P/N 3015-3125) 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 2-5 on page 11 and Figure 2-6 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).

External Filter Includes

Mounting Bracket

P/N: 3015-4256 Rev 14 28

Single Zone Gas Monitor

4.5. 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).

4.6. 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).

4.7. End-of-Line Water Stop (Optional)

The end-of-line water stops (P/N 3015-5512) prevent contaminants and moisture from entering the
monitor. This filter should be checked regularly and replaced when signs of contamination are obvious.

4.8. 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.

4.9. 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).

P/N: 3015-4256 Rev 14 29

Single Zone Gas Monitor

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

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

Main PCB Board Replacement 3015-5478 Water Trap, Manual Drain 0007-1655

Replacement Pump 3015-5176 Replacement Filter 0007-1656

Filters P/N

Charcoal, Zero
Air (HGM Only)

Hydrophobic 0007-1650

Termination, Line End Assembly (gas
sample line)

Line End (Filter Only) 3015-2906 Panel Mount 3015-5491

Tubing P/N

¼ in OD - (for HGM) by the foot 0304-2743 Panel Mount 3015-5493

¼ in OD - (for AGM) by the foot 0304-2742

* See Warning below.

** 3015-5716 is a conversion kit for older-style internal filters

If external, use… 3015-3125 End of Line Water Stop Filter 3015-5512

If internal, use… 3015-5716**

3015-3420

R-134a 3015-3437

R-123 3015-3438

Surge Protectors P/N

Water Traps and Options P/N

Mounting Bracket 0007-1657

Alarms P/N

120 VAC 3015-3076

Audible/
Visual

Audio
Alarm

Gases P/N

Gas Cylinder 1031

R-134a 3015-3851

(100 PPM)

R-123 3015-3852

Gas Verification
Kit

9-28
VDC

9-28
VDC

Surface Mount 3015-5490

Surface Mount 3015-5492

R-22 3015-3850

R-22 3015-3430

WARNING: In compliance with agency approvals and safety regulations, the battery must
be replaced with the specified Bacharach replacement part.

30 P/N: 3015-4256 Rev 14

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: [phone]
Fax: [phone]
Email: [e-mail]

Canada

Bacharach of Canada, Inc.
20 Amber Street Unit #7
Markham, Ontario L3R 5P4
Canada
Phone: [phone]
Fax: [phone]
Email: [e-mail]

Europe

Murco Limited – a Bacharach Company
114a Georges Street Lower
Dun Laoghaire
Co. Dublin
Ireland
Phone: [phone]
Fax: [phone]
Email: [e-mail]

P/N: 3015-4256 Rev 14 31

Single Zone Gas Monitor

R11

100

300

500

R12

100

300

500

R22

100

300

500

R23

100

300

500

R32

100

300

500

R113

100

300

500

R114

100

300

500

R123

25

35

50

R124

100

300

500

R401A

100

300

500

R402A

100

300

500

R404A

100

300

500

R407A

100

300

500

R407C

100

300

500

R407F

100

300

500

R409A

100

300

500

R410A

100

300

500

R502

100

300

500

R503

100

300

500

R508B

100

300

500

H1301

100

300

500

R408A

100

300

500

FA188

100

300

500

R236FA

100

300

500

N1230

100

300

500

HFP

100

300

500

FC72

100

300

500

R125

100

300

500

H1211

100

300

500

H2402

100

300

500

N7100

75

200

300

N7200

25

50

100

N7300

10

20

50

R245FA

100

300

500

R422A

100

300

500

R427A

100

300

500

HFO01234YF

100

300

500

HFO1234ZE

100

300

500

R424A

100

300

500

R426A

100

300

500

Ammonia/NH3/R717

100

300

500

APPENDIX A. DATA TABLES

A.1. Recommended Alarm Settings

Refrigerant

R134A 100 300 500

R402B 100 300 500

R500 100 300 500

R507 100 300 500

Leak PPM Spill PPM Evacuate PPM

Alarm Setting (PPM)

R227 100 300 500

R21 100 300 500

N7600 3 5 8

R422D 100 300 500

32 P/N: 3015-4256 Rev 14

A.2. Response Time/Flow Rate

Single Zone Gas Monitor

Gas-Sample Line

Feet (Meters)

0 0 0

100 (30.5) 20 40

200 (61) 40 60

300 (91.4) 56 90

400 (123) 80 120

500 (152.4) 105 180

Response Time
Seconds (HGM)

Response Time

Seconds (AGM)

Dependent on gas-sample line length; 0.25" OD x 0.17" ID tubing.

P/N: 3015-4256 Rev 14 33

Single Zone Gas Monitor

APPENDIX B. AGENCY APPROVALS

DECLARATION OF CONFORMITY

The manufacturer of the
products covered by this
declaration:

Year conformity is declared: 2010 (EN 14624), 2008 (all others)

Product(s): Refrigerant Monitors

Model(s): HGM-SZ and HGM-MZ (Single and Multi Zone Refrigerant Monitors) (EN 14624 only)

The undersigned hereby declares that the above referenced products are in conformity with the provisions of the following
standard(s) and is in accordance with the following directive(s).

Standard(s):

EN 14624 Performance of mobile leak detectors and of room controllers of halogenated refrigerants

EN 61326-1:2006 Electrical equipment for measurement, control, and laboratory use—EMC requirements: Part 1 General Requirements

EN 61010-1:2001 Safety requirement for control, measurement, and laboratory equipment

Directive(s):

Bacharach, Inc.

621 Hunt Valley Circle

New Kensington, PA 15068

HGM-SZ, AGM-SZ, CO2-SZ, HGM-MZ, AGM-MZ, CO2-MZ and MZ-RD.

2004/108/EC EMC Directive

2006/95/EC Low Voltage Directive

Signature:

Name: Doug Keeports
Title: VP of Product Development
Date: 06 December 2010

The technical documentation file required by this directive is maintained at the corporate headquarters of Bacharach, Inc.

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

34 P/N: 3015-4256 Rev 14

Single Zone Gas Monitor

∇ ∇ ∇

P/N: 3015-4256 Rev 14 35

Single Zone Gas Monitor

621 Hunt Valley Circle, New Kensington, PA 15068-7074

Toll Free: 800-736-4666 • Tel: [phone] • FAX: [phone]

Website: www.MyBacharach.com • E -mail: [e-mail]

Printed in U.S.A.

36 P/N: 3015-4256 Rev 14

Headquarters:

® Registered Trademark of Bacharach Inc.