Danfoss HGM-400 User guide
User manual
Monitor a wide variety of refrigerants
with your Multi-zone gas monitor
Easily programmed to monitor a variety of gases and independent
leak, the evacuation levels may be designated for each zone
www.danfoss.com
User manual | HGM-400 - Multi-zone gas monitor
Index
1.0 Introduction 6
1.1 About this manual 6
1.2 Warning and caution conventions 6
1.3 Safety precautions 6
1.4 Key external hardware components 8
1.5 Functional overview 9
1.5.1 General description 9
1.5.2 Communications options 9
1.5.3 Understanding monitoring levels 9
1.5.4 Response to the presence of multiple refrigerants (HGM Only) 9
1.5.5 Suggested location of sampling points 10
1.5.6 Locating a remote display (optional) 11
1.6 Specications 12
2.0 Installation 14
2.1 Installation considerations 14
2.1.1 Warnings and cautions 14
2.1.2 Inspection 14
2.1.3 Location of the monitor 14
2.1.4 Mounting instructions 15
2.2 Connecting gas sample lines 16
2.2.1 Overview 16
2.2.2 Tubing considerations 16
2.2.3 Connecting purge line 17
2.2.4 Connecting exhaust Line 17
2.2.5 Connecting sample intake lines 17
2.2.6 Installing an optional splitter kit 18
2.2.7 Connecting the water trap 18
2.3 Interior components 19
2.4 Electrical wiring 19
2.5 Connecting communications devices 20
2.5.1 Remote display module (RD) connection 20
2.5.2 Integrating with building management systems 21
2.5.3 Larger integrated systems 21
2.5.4 Changing terminator switch settings 22
2.5.5 Personal computer 22
2.6 Terminating multiple monitors 23
2.7 Connecting to a building management system 23
2.8 PC software 24
2.8.1 Operation 24
2.8.2 Saving and sending programs 25
2.8.3 Trend data 25
2.8.4 Converting the TREND text tile to an Excel le 26
2.8.5 Saving and printing screens and logs 26
2.8.6 USB type laptops 26
2.9 Optional current loop interfaces 26
2.9.1 Optional 4-20 mA DC outputs 26
2.9.2 4-20 mA DC connections 27
2.10 Connecting external alarms 29
2.10.1 Overview 29
2.10.2 Connection 29
3.0 Setup programming 31
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3.1 Initial power up 31
3.2 Data display screen 31
3.3 Navigating to the 1st setup screen 31
3.4 Navigating to the 2nd setup screen 32
3.4.1 Location 32
3.4.2 Number of zones installed 32
3.4.3 Alarm acknowledge mode 32
3.4.4 Audible alarm 33
3.4.5 Zone hold 33
3.4.6 Detection limit 33
3.4.7 Loop mode 33
3.4.8 Loop2 factor 34
3.4.9 Re-zero mode 34
3.5 Navigating to the 3rd setup screen 34
3.5.1 Overview 34
3.5.2 Baud rate 35
3.5.3 Node address 35
3.5.4 Password 35
3.6 Additional service features 35
3.6.1 Service timeout 36
3.6.2 DET digipot 36
3.6.3 Node address 36
3.6.4 Sensor temperature coecient (for factory use only) 36
3.6.5 Password 37
3.6.6 Acquiring temperature coecient (for factory use only) 37
3.6.7 IR digipot 37
3.7 Establishing the CO2 sensor baseline 37
4.0 General operation 38
4.1 Functional overview 38
4.2 The zone setup screen 38
4.2.1 Location 38
4.2.2 Gas/refrigerant type 38
4.2.3 Distance + EXH 39
4.2.4 Temp @ zone 39
4.2.5 Current detection reading 39
4.2.6 Log interval 39
4.3 Navigating to the 2nd zone setup screen 39
4.3.1 Leak level 40
4.3.2 Spill level 40
4.3.3 Evacuation level 40
4.3.4 Re-setting the peak PPM value 40
4.4 Alarms 40
4.4.1 Functional overview 40
4.4.2 Responding to alarms 41
4.4.3 Alarm detail screen 41
4.4.4 Acknowledging alarms 42
4.4.5 Silencing an alarm 42
4.4.6 Clearing the alarm event log 43
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User manual | HGM-400 - Multi-zone gas monitor
4.5 System faults 43
4.5.1 Functional overview 43
4.5.2 Navigating to the fault screen 44
4.5.3 Critical faults 44
4.5.4 Reset to factory default settings 45
4.5.5 Clearing system faults 46
4.5.6 Viewing fault log 46
4.5.7 Viewing ow log 47
4.6 The trend screen 47
4.6.1 Navigating to the trend screen 47
4.7 The calibration screen 48
4.7.1 Overview 48
4.7.2 Navigating to the calibration screen 48
4.7.3 Calibration procedure (HGM and AGM only) 48
4.7.4 Adjusting calibration factor (HGM and AGM only) 49
4.7.5 CO2 atmospheric concentration 49
4.7.6 Programming new gases (HGM only) 50
4.8 Zone hold mode 51
4.9 The diagnostic screen 51
4.9.1 Navigating to the diagnostic screen 51
4.9.2 Diagnostic screen overview 52
5.0 Maintenance 53
5.1 Troubleshooting 53
6.0 APPENDIX A 55
7.0 APPENDIX B 56
7.1 Overview 56
7.2 MODbus RTU Protocol 56
7.3 Multi-zone MODbus RTU operation 56
7.3.1 Overview 56
7.3.2 Protocol details 56
7.3.3 Multi-zone monitor polling 57
7.3.4 Network topologies 57
7.3.5 Key comm protocol parameters 58
7.3.6 Summary of registers 58
7.3.7 System data register 0x0010 (16 Dec) (R/W, 54 Bytes) 59
7.3.8 Status register 0x011 (17 Dec) (R/W, 10 Bytes) 60
7.3.9 Fault code table 60
7.3.10 Zone data register 0x12xx (R/W, 78 Bytes) 61
7.3.11 Alarms and alarm acknowledge 62
7.3.12 Date time register 0x0015 (21 Dec) (R/W, 14 Bytes) 63
7.3.13 Sensor data register 0x0016h (22 Dec) (R, 82 Bytes) 63
7.3.14 Release zone hold register 0x0017h (23 Dec) (W, 10 Bytes) 64
7.3.15 Hold zone register 0x0018h (23 Dec) (W, 10 Bytes) 64
7.3.16 Multi-zone hold mode 64
7.3.17 Fault log register 0x1900-01 (6400-6401 Dec) (R, 302 Bytes) 64
7.3.18 Flow log register 0x001F (31 Dec) (R, 142 Bytes) 65
7.3.19 Alarm log register 0x1A00-02 (6656-58 Dec) (R, 582 Bytes) 65
7.3.20 Service mode register 0x001B (27 Dec) (W, 10 Bytes) 65
7.3.21 Release service mode 0x001C (28 Dec) (W, 10 Bytes) 65
7.3.22 Multi-zone service mode 66
7.3.23 PPM register 0x001E (30 Dec) (R, 32 Bytes) 66
7.3.24 Zone log registers 0x3xyy (R, 1502 Bytes) 66
7.3.25 MODbus exception responses 67
7.3.26 MODbus gas enumeration 67
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User manual | HGM-400 - Multi-zone gas monitor
8.0 APPENDIX C 68
9.0 Replacement parts & optional accessories 70
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User manual | HGM-400 - Multi-zone gas monitor
1.0 Introduction
1.1 About this manual
To assure operator safety and the proper use of the monitor please read this manual.
It provides important information on the installation, operation, maintenance, and servicing of the
monitor and display module.
If you have a working knowledge of your gas monitor, you will nd this manual useful as a reference
tool. If you are new to the use of gas monitors, this document is educational in the principles of gas
detection and the proper operation of this device.
1.2 Warning and caution conventions
When used in this manual or as labeled on the gas monitor, the following hazard symbols and/or
associated words are dened as follows.
WARNING: this symbol and/or the use of the word WARNING indicates a potential
hazard associated with the use of this equipment. It calls attention to a procedure,
practice, condition, or the like, which if not correctly performed or adhered to, could
result in death or serious injury
1.3 Safety precautions
WARNING: this symbol and/or the use of the word WARNING indicates a potential
hazard from electrical shock. It calls attention to a procedure, practice, condition, or the
like, which if not correctly performed or adhered to, could result in death or serious injury
CAUTION: this symbol and/or the use of the word CAUTION indicates a potential hazard
associated with the use of this equipment. It calls attention to a procedure, practice,
condition, or the like, which if not correctly performed or adhered to, could result in
minor or moderate injury
IMPORTANT: the use of the word IMPORTANT in this manual calls attention to a
procedure, practice, condition, or the like, which if not correctly performed or adhered to,
could result in incorrect performance of or damage to the equipment and may void the
warranty
WARNING: this instrument has not been designed to be intrinsically safe for use in areas
classied as hazardous locations. For your safety, DO NOT use it in hazardous (classied)
locations
WARNING: this is NOT a safety device. Some gases which this instrument can detect may
be combustible/ammable. When properly congured, this instrument is designed to
alarm at concentrations that are lower than the explosive limit of the gas. As such, it is the
buyer’s responsibility to initiate an immediate planned response to any gas leaks as soon
as they are detected. This equipment should NEVER be used to measure or sample gases
at or above their respective lower explosive limits
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IMPORTANT: the gas monitor uses a universal power supply that is capable of accepting
inputs of 100 to 240VAC, 50/60Hz. The monitor’s power consumption is 20Watts.
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 must be included in the building installation.
The switch must be in close proximity to the monitor and within easy reach of the
operator.
The switch must be clearly marked as the disconnecting device for the equipment
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User manual | HGM-400 - Multi-zone gas monitor
WARNING: under no circumstances should the monitor be operated without connection
to a protective ground. Doing so poses a potential shock hazard and is also a violation of
electrical safety standards applicable to this type of equipment
WARNING: do not operate this equipment in the presence of ammable liquids, vapors,
or aerosols. Operation of any electrical instrument in such an environment constitutes a
safety hazard
WARNING: it is imperative that the exhaust port on this instrument be properly vented as
described in this manual. Failure to do so may constitute a safety hazard
WARNING: extreme care should be exercised when accessing the interior of the monitor.
Only qualied electrical maintenance personnel should make connections and perform
adjustments. Always remove AC power before opening the monitor’s enclosure
WARNING: the protection provided by the monitor may be impaired if the monitor is
used in a manner not specied by Danfoss. Modications to this monitor, not expressly
approved, will void the warranty
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 qualied repair technician or the nearest Danfoss Service Center.
WARNING: this device uses type "F" fuses ("F1" and "F2") rated at 1.0A, 250VAC.
Replace ONLY with Danfoss-approved fuses
WARNING: electrical installation should be performed by a certied electrician, and must
comply with all applicable NEC/CEC and local electrical safety codes
IMPORTANT: use ONLY the provided knockouts for electrical and communications
wiring. Drilling into the box will void the warranty
IMPORTANT: this device is classied as Installation Category II, Pollution Degree II, as
dened by UL
IMPORTANT: this device is designed for operation at or below an altitude of 6.562ft
(2,000 m). Do not operate this device above this altitude limit
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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
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Product label showing
gas type (halogen shown)
Solenoid
connections
(1 bank of
4 shown)
Purge port
Exhaust port
Enclosure knockout
Display screen
System fault
LED (yellow)
Power
LED (green)
Keypad
Enclosure door
Alarm
LED (red)
User manual | HGM-400 - Multi-zone gas monitor
1.4 Key external hardware components
NOTE: mounting cutouts are located on the back of the monitor, and are visible from
inside the Multi-zone monitor. A mounting template is also shipped with the monitor.
For mounting information, (see 2.1.4 "Mounting instruction")
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User manual | HGM-400 - Multi-zone gas monitor
1.5 Functional overview
1.5.1 General description
Gas monitors are specied to support compliance to federal, state and local safety codes governing
emissions. Avoiding signicant loss reduces equipment replacement costs, maintains equipment
eciency, promotes safety, and protects the environment.
The Danfoss Multi-zone monitor provides continuous monitoring of gas levels in up to 16 separate
test zones. The instrument is easily programmed to monitor a variety of gases (dependent on
particular model) and independent leak (small), spill (medium), and evacuation (large) levels may be
designated for each zone. The instrument also retains a log of previous readings that can be easily
accessed for analysis.
An audible alarm and front panel indicators are provided to signal alarm and fault conditions, and
relay contacts are provided that can be used to trigger external alarm devices in the event of a system
fault, or if a leak (small), spill (medium), or evacuation (large) level of gas is detected. The system also
may be tted with and optional two-channel 4-20mA current loop board for connection to remote
monitoring equipment.
The Multi-zone monitor requires only minor periodic maintenance such as the occasional
replacement of lters. The monitor incorporates active diagnostics that continuously check the
system for proper operation. A front panel indicator is provided to alert an operator of system
malfunctions, and fault codes are generated that enable the user to identify the cause of the fault.
1.5.2 Communications options
1.5.3 Understanding monitoring levels
1.5.4 Response to the presence of multiple refrigerants (HGM Only)
The Multi-zone monitor features full two-way communications via an RS-485 interface. MODbus RTU
is the communications protocol standard. The instrument can be connected directly to a Building
Management System or it may be operated as a stand-alone system.
An RS-232C port is also provided for connection to a PC. This enables the monitor to be setup from a
personal computer. (See 7.0 "Appendix B").
Eective use of this instrument requires an understanding of what constitutes reasonable alarm set
points for the types of gas being monitored. Manufacturers dene allowable exposure levels and
threshold limit values in units of parts per million (ppm). In a good "tight" installation these
background levels will be acceptably low and often do not require corrective action. You can reduce
nuisance alarms and needless service calls if the alarm levels are set at practical limits. Danfoss has
developed recommended monitoring refrigerant gas levels based on compliance to ANSI/BSR
ASHRAE 15-2007 and ASHRAE Safety Code 34-2007. (See 6.0 "Appendix A").
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 inuenced by
the volume of air in the sampling area, air circulation, size of the leak, distance to the monitoring
point, and a host of other variables. In some cases the set points may need to be adjusted either up or
down to achieve eective monitoring.
The HGM-400 multi-zone is a refrigerant level monitor, not a gas analyzer. You must program the
monitor to test for a specic refrigerant, and it will only return accurate concentration readings for
that particular refrigerant. If a leak occurs of another refrigerant gas type, the monitor may return
incorrect readings.
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Most applications only require detection of a single refrigerant and the problems that are associated
with monitoring multiple gases are rarely an issue. If there is a possibility of multiple refrigerants
leaking in the same sampling zone, then you should carefully consider which refrigerant compound
you program the unit to monitor.
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User manual | HGM-400 - Multi-zone gas monitor
1.5.5 Suggested location of sampling points
At the point of a leak the gas is nearly pure. As the gas is dispersed into the air, the gas molecules
diuse, causing a dilution of the original concentration. The monitor measures the concentration at
the sample collection point. Therefore, if the termination of the collection line is not at the exact
point of the leak, the unit will read a diluted mixture of the gas and air.
It should also be noted that gases of interest are heavier than air and tend to collect below the point
of a leak. Therefore a sample taken near the oor will have a greater concentration of gas than that
collected above the source of a leak. Therefore, sampling points should be located as close as
possible to the sources of potential leaks. If this is impractical, then the alarm set points should be
adjusted for that zone to compensate for the dilution of the gas. Sample inlet lters should be
mounted 12-18" (30.5-45.7cm) above the oor.
DO NOT block any of the zones, unused zones may be disabled by setting the distance parameter to
zero feet in the zone setup screen.
The Multi-zone monitor should be centrally located in the mechanical room and be readily accessible
for easy visual monitoring and servicing. The combined length of sample tubing plus exhaust tubing
should not exceed 1200 ft (366m) for any zone. The fresh air purge line should draw from an area that
does not contain any gas. The exhaust line should run to an outside location if possible.
NOTE: the combined length of the purge line and the exhaust line cannot exceed
500ft
Ideally, two to three pick up points spaced around each chiller will provide sucient coverage. It may
be necessary to perform a smoke test of the mechanical room to determine the best locations.
The smoke test provides the pattern of air currents present in the mechanical room.
The Multi-zone 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.
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User manual | HGM-400 - Multi-zone gas monitor
1.5.6 Locating a remote display (optional)
The Remote display module should be mounted outside of the mechanical room, or just inside the
room’s doorway if the rst option isn’t possible. This is the "split architecture design" for safety of the
operator. The Remote display can be located up to 4500ft (1372m) from the Multi-zone monitor. The
Remote display is the man machine interface by which you program the Multi-zone, acknowledge
alarms and observe conditions inside of the mechanical room. Note that there are two additional
alarm relay contacts in the Remote display that can be programmed to alarm on leak, spill, evacuate,
fault, or monitor on conditions.
MZ/RD gas leak monitor placement in a mechanical room
• A Sample inlet pickup poin.
• B Outside pickup point away from refrigerant gas (fresh air for Multi-zone purge cycle).
• C Charcoal lter.
• D Exhaust air (to outside).
• E Multi-zone gas monitor.
• F Remote display (outside mechanical room).
• G Exhaust fan.
• H Horn/strobe alarm outside mechanical room door.
• I 2nd auxiliary horn/strobe remote alarm.
• J Chiller.
NOTE: the pickup points located on the oor in the above illustration are examples for
refrigerants which are heavier than air. Placement of pickup points should be determined
based on characteristics of the gas being monitored and ambient conditions of the
sampling area.
(Air=28.9 g/mole, CO2=44.0 g/mole, NH3=17.0 g/mole, and halogens = 100+ g/mole)
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User manual | HGM-400 - Multi-zone gas monitor
1.6 Specications
HGM-MZ Specications
Product type Multiple refrigerant gases and multiple area monitoring system for low level
Sensitivity All gases 1 ppm
Measuring range All gases 0 to 10.000 ppm
continuous monitoring of CFC, HCFC and HFC refrigerant gases used in most
commercial refrigeration systems. System design supports compliance to the
refrigerant monitoring requirements of ANSI/BSR ASHRAE 15-2007 and ASHRAE
Safety Code 34-2007
Accuracy
1
±1 ppm ±10% of reading from 0-1000 ppm
(R11, R22, and R113 ±10 ppm ±15% of reading 0-1000 ppm)
Gas library CFC: HFP, R-11, R-12, R-113, R-114, R-502;
HFC: R125, R-134a, R236FA, R245Fa, R32, R-404a (HP62), R-407a,
R-407c (AC9000), R-410a (AZ20), R422a, R422d, R427a, R-507 (AZ50),
R-508b (SUVA95);
HCFC: R-123, R-124, R21, R-22, R227, R-23, R-401a (MP39), R-402a (HP80),
R 402b (HP81), R-408a, R-409a, R-500, R-503;
Halon: H1211, H1301, H2402;
Other: FA188, FC72, H1234YF, N1230, R424A, R426A, R438A, CUSTOM.
AGM-MZ Specications
Product type The AGM-MZ provides multiple area monitoring system for low level continuous
monitoring of Ammonia gases used in most commercial systems
Sensitivity 20 ppm
Measuring range 25 to 10,000 ppm
Accuracy
1
±10 ppm ±10% of reading from 0-10,000 ppm
Gas library Ammonia (NH3)/R-717
CO2-MZ Specications
Product type The CO2-MZ provides multiple area monitoring for low level continuous
monitoring of carbon dioxide gases used in most commercial systems.
System design supports compliance to the gas monitoring requirements of
ANS/BSR ASHRE 15-1994
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Sensitivity 10 ppm
Measuring range 300-8.000 ppm
Accuracy
1
±5 PPM ±5% of reading from 300-1000 ppm, ±10% of reading
from 1001-3000 ppm
Gas library Carbon Dioxide (CO2)/R-744
1
At reference environmental conditions (25°C, 45% RH non-condensing, 1 ATM)
General Multi-zone Specications
Coverage 4 point standard, expandable to 16 points in 4 point increments
Detector type Infrared non-dispersive
Front panel 3 Indicator lights:
• Green: monitor is powered ON. LED glows during normal operation;
ashes when unit is in warm-up mode
• Red: alarm. LED ashes when any point has exceeded the alarm setting
• Yel low : fault. LED ashes when there is a system fault
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User manual | HGM-400 - Multi-zone gas monitor
General Multi-zone Specications
Size (HxWxD) 12.23" x 13.7" x 4.96" (31.06cm x 34.80cm x 12.60cm)
Weight 15lbs. (6.8kg)
Sampling mode Automatic or manual (hold)
Re-zero Auto or on zone change
Response time 5 to 315 seconds - depending on air line length and number of zones
System noise Less than 40dB(A) @ 10ft (3m)
Monitoring
distance
Conditioned
signal
Alarms Four SPDT alarm contacts rated 2A at 250VAC (inductive) 5A at 250VAC (resistive).
Communications Full two-way communications with Remote Display Module or Building
Power safety
mode
Operating
temperature
Ambient
humidity
AC power 100 to 240VAC, 50/60Hz, 20W
Certication UL 61010-1, CAN/CSA 22.2 No. 61010-1 & CE Mark
Warranty 2 years from date of shipment
Altitude limit 6.562ft (2,000m)
1.200ft (366m) maximum for combined length of sample + exhaust tubing
(each zone)
Dual optional 4-20mA DC isolated outputs. Channel 1 = zone area,
Channel 2 = PPM
Three are assigned to PPM level alarms, one assigned to system faults
Management System via RS 485 serial interface. RS-232C communications port
standard
Fully automatic system reset. All programmed parameters retained
32 to 122°F (0 to 50°C)
5% to 90% RH (non-condensing)
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Sensor life 7-10 years
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User manual | HGM-400 - Multi-zone gas monitor
2.0 Installation
2.1 Installation considerations
2.1.1 Warnings and cautions
WARNING: explosion hazard! Do not mount the Multi-zone monitor in an area that may
contain ammable liquids, vapors, or aerosols. Operation of any electrical equipment in
such an environment constitutes a safety hazard
WARNING: shock hazard! Always disconnect AC power before working inside the
monitor
CAUTION: drilling holes in the Multi-zone enclosure may damage the unit and will void
the warranty. Please use the knockouts provided for electrical connections
2.1.2 Inspection
2.1.3 Location of the monitor
CAUTION: the Multi-zone monitor contains sensitive electronic components that can be
easily damaged. Do not touch nor disturb any of these components
The Multi-zone 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 Danfoss Service
Center for assistance.
The Multi-zone monitor should be centrally located in the facility and should be easily accessible for
visual monitoring and servicing. Combined length of the intake sample line and the exhaust line
cannot exceed 1200ft (366m) in length, but it is important to remember that sampling cycle time is
proportional to the total number and length of individual sample lines.
Dirt, grease, and oils can adversely aect the operation of the Multi-zone monitor.
The monitor should be installed out of direct sunlight in a clean, dry area that is not subject to
temperature or humidity extremes. Installation of the monitor in a mechanical room is acceptable
provided reasonable environmental conditions exist. If there is a question, consider installing the unit
outside of the mechanical room in a cleaner area of the facility.
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NOTE: the mounting location of the monitor should allow it to be easily accessible for
visual monitoring and servicing
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A
BC
E D
F
TOP
Mounting instructions
Four ¼ inch (6.35mm) fasteners are required to mount
the Multi-zone enclosure. Allow approximately ¼ inch (6.35mm)
of each fastener to remain exposed.
The enclosure can slide directly on to the screw heads for mounting.
Verify position of enclosure on fasteners and tighten all fasteners.
A = 13 “ = 13.56” = 34.44cm D = 2 “ = 2.03” = 5.16cm
B = 9 “ = 9.31” = 23.65cm E = 8 “ = 8.86” = 22.50cm
C = 2 “ = 2.86” = 7.26cm F = 12 “ = 12.25” = 31.12cm
9
16
1
32
1
4
55
64
5
16
55
64
User manual | HGM-400 - Multi-zone gas monitor
2.1.4 Mounting instructions
NOTE: the Multi-zone monitor should be installed plumb and level and securely fastened
to a rigid mounting surface
The enclosure utilizes keyhole mounting brackets designed for ¼ inch fasteners. Locate the four
screws as shown in the diagram below or by using the provided mounting template. Allow the screw
heads to protrude approximately ¼ inch.
Multi-zone Monitor mounting specications
Hold the monitor at against the mounting surface and allow it to slide down, engaging the screw
heads in the keyhole slots of the mounting brackets. Adjust the screws as necessary to hold the
monitor securely against the mounting surface.
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User manual | HGM-400 - Multi-zone gas monitor
2.2 Connecting gas sample lines
2.2.1 Overview
Individual gas sample lines are run from the Multi-zone monitor to each area of the facility to be
monitored. Additionally, a purge line is installed to provide clean air for resetting the infrared zero
baseline.
All air, sample, and purge line connections are located on the left side of the enclosure.
(See the illustration below).
Multi-zone monitor side view
2.2.2 Tubing considerations
1
16
Exhaust port
Purge port
PURGE
EXHAUST
Inlet ports (quantity = 4,8,12 or 16)
8
7
6
5
9
10
11
12
4
3
2
13
14
15
Serial communications (PC) port
Use ¼" (6.35mm) outside diameter (0.040" or 1.016mm wall) ex tubing for all air lines or equivalent.
The tubing should be clean and free of residual moisture or other contaminants. The tubing should
be cut cleanly with a sharp knife and care should be taken not to distort the tubing end. To connect
the air lines to the monitor simply push the tubing rmly onto the connector. To remove a line, press
the plastic ring on the connector with one hand, then withdraw the tube with your other hand.
(See the image below).
© Danfoss | DCS (ZA) | 2016.03
Using PTC connectors: connecting (left) and disconnecting (right)
The Multi-zone monitor uses push-to-connect
(PTC) style connectors.
To insert sample lines, rmly push the
appropriate tubing into the hole in the center of
the connector until it seats in the connector.
Refer to the gures at the left.
To remove tubing from a PTC connector, push
and hold the spring-loaded collar inwards, then
simultaneously withdraw the tubing.
Refer to the gures at the right.
All tubing bends should have a radius of no less than 5" (12.7cm) to ensure proper airow.
If kinks or obstructions occur in any of the air lines the instrument may not function properly.
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User manual | HGM-400 - Multi-zone gas monitor
2.2.3 Connecting purge line
A purge line is an intake line that is required to draw fresh air into the instrument and should not
exceed 300ft (91.44mm) 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 lter
assembly can be used with the Halogen Gas Monitor to lter refrigerant from the purge line. It may be
mounted adjacent to the monitor. A line-end lter should be attached to the end of the purge line
when the charcoal lter is not used.
Note that the charcoal lter option must NOT be used in ammonia or CO2 applications.
IMPORTANT (CO2 Only): because CO2 is present in ambient air, the purge line MUST BE
run outside, away from any known sources of CO2 gas. An atmospheric CO2 concentration
value can be manually entered by the user in the CAL screen.
(See 4.7.5 "CO2 Atmospheric concentration").
2.2.4 Connecting exhaust Line
An exhaust line can be used when it is required to vent gas samples away from the instrument and
should not exceed 300ft (91.44mm) in length. The exhaust line should terminate in a location that is
completely isolated from the purge line termination point and other areas of the facility that will be
monitored. Ideally this line should terminate outdoors in a location that is not exposed to the
elements. This line does not require a line-end lter.
If the exhaust line terminates outside the building, position the tubing so that no water or moisture
can enter it.
2.2.5 Connecting sample intake lines
The Multi-zone monitor is designed to accommodate up to 16 separate sample intake lines. The
standard conguration of the unit includes one manifold of 4 intake connectors and 1 purge
connector.Additional manifolds can be easily installed to increase monitoring capacity
(eld installation kit, and 4 zone line end lter kit).
Sample intake lines can be up to 1.200ft (366m) when no exhaust tubing is used, otherwise, the
combined length of the sample line and the exhaust line cannot exceed 1.200ft (366m).
All line terminations should be positioned to reduce the possibility of mists, aerosols, oil, water, dust,
or other contaminates being drawn into the instrument. A line-end lter should be attached to the
end of each sample intake line. Line-end lters should be placed 12" to 18"
(30.5cm to 45.7cm) above the oor.
IMPORTANT: DO NOT block any of the zones. Unused zones may be disabled by setting
their length parameter to zero in the zone setup screen.
Depending on type of use and location of lines, the end-of-line water stop lter assembly can be used
to prohibit moisture from entering the intake lines. Three end-of-line water stop lters are supplied
with a standard unit.
Place the end of the intake line into the blue receiver of the end of line water stop and tighten
suciently.
NOTE: only one lter assembly, either the line-end lter or end-of-line water stop, should
be used for each line.
© Danfoss | DCS (ZA) | 2016.03
Please (see 1.5.5 "Suggested location of sampling points") to learn more about where to place the
ends of the sample intake lines.
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User manual | HGM-400 - Multi-zone gas monitor
2.2.6 Installing an optional splitter kit
Splitter kits are made available which allow the Multi-zone unit to take gas sample readings from
several sample points while utilizing just a single zone. These kits are designed for use ONLY in
conned/dened spaces with high potential for leaks, such as food cases, cold rooms, refrigeration
rack rooms, etc.
Multi-zone gas monitor’s 2 way and 3-way splitter kits are available as optional accessories.
Chiller
2.2.7 Connecting the water trap
Condenser
Coldstores
Compressor Receiver
2-way splitter
3-way splitter
HGM-400
HALOGEN GAS MONITOR
Multi-Zone
Additional
sample lines
Additional
sample lines
Purge line
The water trap is an optional accessory for applications that result in water or condensation
frequently entering the intake lines. This is available in a manual style trap which is manually emptied
once it has become lled. Install the water trap close to the unit for the most eective results.
The intake line may be cut where the user nds appropriate (preferably close to monitor).
© Danfoss | DCS (ZA) | 2016.03
Each side of the intake line should be inserted into the receivers on either side of the water trap.
Secure tightly, a replacement lter for the water trap is available and is replaced by unscrewing the
clear plastic cup of the water trap, pulling the lter directly out (do not unscrew), and inserting the
new lter into place.
Replace the cup of the water trap, If desired, an optional mounting bracket may be used to secure the
water trap in place.
NOTE: the termination lter or end-of-line water stop lter should be used, regardless of
the presence of a water trap
IMPORTANT: extreme or humid temperatures may cause water to condense in the tubes.
A water trap is highly recommended for use in these scenarios
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connector
!
!
User manual | HGM-400 - Multi-zone gas monitor
2.3 Interior components
Multi-zone monitor interior components
Gas inlet
10-pin connector
(detector)
Main PC board
J6 connector
(detector)
Hydrophobic
lter
IR
bench
Pressure
connector
Line fuses
(1 A, 250 V)
Gas outlet
12-pin connector
(IR source)
AC input
terminals
J5 connector
(IR source)
2.4 Electrical wiring
Relay connectors
(leak, spill,
evacuate
and fault
Manifolds
4-20 mA DC
outputs (optional)
The Multi-zone monitor uses a universal power supply that is capable of accepting inputs of 100 to
240VAC, 50/60Hz. The monitor’s power consumption is 20W, it is highly recommended that the
monitor be connected directly to the AC power source, preferably on its own circuit. The AC power
connection should be completed with UL listed 3 conductor wire (minimum 16 AWG), rated 300VAC
at 105°C. Locate a convenient service knockout and install electrical conduit in the typical manner.
Locate the AC input terminals and ground stud on the inside of the monitor, secure the incoming AC
power neutral (white/blue) and live (black/brown) wires to the LINE 1 and LINE 2 terminals. Using the
supplied crimp-on ring terminals, washers, and nuts, connect the incoming AC power ground wire
(green) to the monitor’s AC input ground stud, and then install a separate wire between the ground
stud and the GND terminal.
Pump
NOTE: the plastic cable ties surrounding the air pump are to ensure safe handling during
shipping. Please remove before operation, reinstall a plastic cable around the air pump if
the unit is shipped to Danfoss for service or repair.
This prevents damage during shipping
Microprocessor
board
Termination
switches
CPU reset
RS-485
© Danfoss | DCS (ZA) | 2016.03
WARNING: electrical installation should be performed by a certied electrician, and must
comply with all applicable NEC/CEC and local electrical safety codes
WARNING: copper conductors for connection to supply mains must be made in
accordance with NEC/CEC and local codes
WARNING: the AC power ground wire must rst 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.
IMPORTANT: drilling holes in the Multi-zone enclosure may damage the unit and will
void the warranty. Please use the knockouts provided for electrical connections
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User manual | HGM-400 - Multi-zone gas monitor
A switch or circuit breaker rated 1.0A, 250VAC must be attached to the monitor’s AC power leads. This
switch must also be located in close proximity to the monitor, and be in easy reach of the operator.
This switch should also be clearly marked as the monitor’s main AC disconnect device.
The circuit breaker or switch must disconnect all current-carrying conductors (e.g., live and neutral).
Multi-zone AC input power and ground connections
LINE 2 (live)
LINE 1 (neutral)
GND
2.5 Connecting communications devices
2.5.1 Remote display module (RD) connection
LINE 2
Use supplied crimp-on
LINE 1
ring terminal, washers, and
nuts to connect AC ground
wires to ground stud as
shown to meet approval
agency requirements
Ground stud
IMPORTANT! AC input
ground wire always
on bottom of Ground stud
The Multi-zone is connected to the optional Remote display using a shielded twisted pair instrument
cable, the maximum distance between the farthest Multi-zone and Remote display is 4500ft.
Use any of the remaining service knockouts to gain access to the interior of the monitor, the RS-485
communications wiring between the Multi-zone and Remote display must be connected in the
following manner:
© Danfoss | DCS (ZA) | 2016.03
1. Locate the RS-485 connector in the Multi-zone, (see gure "Monitor interior components").
2. Connect one lead of a twisted shielded pair to the "B" connection point, note the wire colour.
3. Connect the second wire to the "A" connection point, note the wire color.
4. Connect the ground to the "GND" connection point.
5. Locate the RS-485 connector marked "TO MONITORS" in the Remote display.
This connector is located on the bottom of the Remote display PC board, second from the right.
6. Run the wire to the Remote display and connect the twisted shielded pair to the RS-485
"TO MONITORS" connector using the same color code as used on the Multi-zone.
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LEAD B
LEAD A
GROUND
User manual | HGM-400 - Multi-zone gas monitor
2.5.2 Integrating with building management systems
The Multi-zone may be connected directly to a Building Management System using a shielded
twisted pair cable. The cable from the Building Management System is connected to the RS-485
connector inside the Multi-zone monitor. MODbus RTU is the standard communications protocol.
Use any of the remaining service knockouts to gain access to the interior of the monitor:
• locate the RS-485 connector and remove it from the circuit board
• secure the wire leads to the connector orienting them as shown in the diagram below
• check to make sure that the polarity matches the wiring to the Building Management System
When you are through securing the connections, carefully plug the connector back onto the circuit
board.
2.5.3 Larger integrated systems
You may also connect the Multi-zone monitor to a Building Management System through a Remote
Display, in this case, rst connect the Multi-zone to the Remote display as described above, then,
follow the instructions in the Communications Connections section of the Remote display manual for
information on how to connect the Remote display to a Building Management System.
RS-485 connector
RS-485
© Danfoss | DCS (ZA) | 2016.03
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User manual | HGM-400 - Multi-zone gas monitor
2.5.4 Changing terminator switch settings
The terminator switch is shipped from the factory in the "OUT" position (no termination), this is the
correct setting if the Multi-zone is to be installed in the middle of a network, if the Multi-zone monitor
is connected as a single device or if it is the last device on the network chain, the terminator must be
moved to the "IN" position.
Locate switch #4 and determine its position, if it must be moved, slide the switch to the appropriate
position. Note that switches 1-3 are for service use.
Termination switches
2.5.5 Personal computer
ON
Terminator IN
1 2 3 4
ON
Terminator OUT
1 2 3 4
Terminator switch
ON
1 2 3 4
The Multi-zone may be connected to a personal computer using the RS-232 interface on the left side
of the enclosure. Software will be provided upon request.
NOTE: (see 2.8 "PC Software")
© Danfoss | DCS (ZA) | 2016.03
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