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

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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 Specications 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 coecient (for factory use only) 36

3.6.5 Password 37

3.6.6 Acquiring temperature coecient (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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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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8.0 APPENDIX C 68

9.0 Replacement parts & optional accessories 70

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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 dened 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 classied as hazardous locations. For your safety, DO NOT use it in hazardous (classied) locations

WARNING: this is NOT a safety device. Some gases which this instrument can detect may be combustible/ammable. When properly congured, 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

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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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 qualied 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 specied by Danfoss. Modications 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 qualied 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 certied 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 classied as Installation Category II, Pollution Degree II, as dened 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

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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1.5 Functional overview

1.5.1 General description

Gas monitors are specied to support compliance to federal, state and local safety codes governing emissions. Avoiding signicant loss reduces equipment replacement costs, maintains equipment eciency, 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").

Eective use of this instrument requires an understanding of what constitutes reasonable alarm set points for the types of gas being monitored. Manufacturers dene 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 inuenced 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 eective monitoring.

The HGM-400 multi-zone is a refrigerant level monitor, not a gas analyzer. You must program the monitor to test for a specic 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.

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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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 diuse, 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 sucient 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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1.6 Specications

HGM-MZ Specications

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 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 Specications

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

±10 ppm ±10% of reading from 0-10,000 ppm

Gas library Ammonia (NH3)/R-717

CO2-MZ Specications

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

Sensitivity 10 ppm

Measuring range 300-8.000 ppm

Accuracy

±5 PPM ±5% of reading from 300-1000 ppm, ±10% of reading from 1001-3000 ppm

Gas library Carbon Dioxide (CO2)/R-744

At reference environmental conditions (25°C, 45% RH non-condensing, 1 ATM)

General Multi-zone Specications

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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General Multi-zone Specications

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

Certication 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)

Sensor life 7-10 years

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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 aect 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.

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

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

1 4

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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 specications

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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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

Exhaust port

Purge port

PURGE

EXHAUST

Inlet ports (quantity = 4,8,12 or 16)

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).

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 airow. If kinks or obstructions occur in any of the air lines the instrument may not function properly.

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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 conguration 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 suciently.

NOTE: only one lter assembly, either the line-end lter or end-of-line water stop, should be used for each line.

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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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 conned/dened 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

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 eective results. The intake line may be cut where the user nds 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 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

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

WARNING: electrical installation should be performed by a certied 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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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:

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

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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

Terminator IN

1 2 3 4

Terminator OUT

1 2 3 4

Terminator switch

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")

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Terminator

Remote

User manual | HGM-400 - Multi-zone gas monitor

2.6 Terminating multiple monitors

Termination settings for a network of multiple monitors and a remote display

display

RS-485

Terminator OUT

Terminator IN

1 2 3 4

OUT

The last unit on each end of the

network must have its RS-485

terinator switch set to “IN”

OUT

1 2 3 4

Terminator OUT

1 2 3 4

Terminator OUT

switch

1 2 3 4

OUT

Terminator IN

Terminator OUT

1 2 3 4

Terminator IN

MZ unit: 1, node: 1 MZ unit: 2, node: 2 MZ unit: 3, node: 3 MZ unit: 4, node: 4

NOTE: for multiple Multi-zone with Remote Display, the last Multi-zone or Remote display on either end of the network must have its terminator in the "IN" position, and all other units must have their terminators in the "OUT " position

IMPORTANT: extreme or humid temperatures may cause water to condense in the tubes, a water trap is highly recommended for use in these scenarios

2.7 Connecting to a building management system

The Multi-zone monitor may be connected to a Building Management System via the RS-485 connector. The node address on each Multi-zone monitor may be set from 1 to 15 in order to identify itself to the Building Management System.

NOTE: building Management Systems set to a 0 or 1 address both respond to messages from the Remote display as address 1, therefore you should not have a unit set to 0 and another set to 1 on the same network

If the Multi-zone network is connected directly to a Building Management System it may not be connected to the RD. However, the Remote display has two communications ports, an "upstream" port (labeled BMS) and a "downstream" port (labeled TO MONITORS). A Building Management System node may be connected to the upstream Remote display port while the downstream Remote display port talks to the Multi-zone monitors, in this case, the Building Management System is talking "through" the Remote display to the Multi-zone monitors, but not physically on the Multi-zone/RD network.

NOTE: user must have two (2) dedicated ports to successfully complete the required setup

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Termination settings for multiple monitors connected to a Building Management System (two trunks)

Terminator IN

1 2 3 4

Building Managemant

OUT

1 2 3 4

Terminator OUT

system (BMS)

Terminator IN

OUT

1 2 3 4

Terminator OUT

1 2 3 4

Terminator IN

2.8 PC software

MZ node: 1

MZ node: 2

MZ node: 3

MZ node: 4

Termination settings for multiple monitors connected to a Building Management System (daisy chain)

Building Managemant

system (BMS)

Terminator IN

OUT

1 2 3 4

Terminator OUT

MZ unit: 1, node: 1

OUT

1 2 3 4

Terminator OUT

MZ unit: 2, node: 2

OUT

1 2 3 4

Terminator OUT

MZ unit: 3, node: 3

1 2 3 4

Terminator IN

MZ unit: 4, node: 4

2.8.1 Operation

NOTE: the Multi-zone is compatible with HGM-400 PC software version 1.52 and higher, however, calibration data can only be edited on the front panel of the Multi-zone, not through the PC software or RDM units

NOTE: The PC software is not compatible with 64-bit (or newer) computers

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NOTE: The PC software uses COM1 by default, therefore, the interface cable should be connected to the port congured as COM1 on the PC. Also, no other software drivers or devices in the computer may control COM1 when the Multi-zone software is in use, alternatively, COM2 (for example) may be used by adding a space and the number 2 to the command line as follows: C:\ pc2HGM.exe 2. When using a USB to serial converter, be sure it has been mapped to COM1 or COM2. The connection is made through a standard "straight through" serial port connection. A three-wire connection is used (RXD, TXD, and GND), no hardware ow control is used, the Multi-zone software automatically congures COM1 to match the Multi-zone RS-232 communications parameters

NOTE: occasionally, the laptop connection will not connect properly and only two beeps are heard and the program times out, to resolve this, disconnect the RS-232 cable and cycle power ON the Multi-zone and the laptop, after both are operational, connect the RS-232 cable and start the software program

1. Apply power to Multi-zone monitor and allow it to warm up. Note that on CO2 models, a "Clearing Purge Line" message is displayed for approximately 2.5 minutes before warm up begins.

2. Connect RS-232 interface cable to the PC and RS-232 port on the Multi-zone monitor.

3. Insert software disk into the PC.

4. Open the Multi-zone software using Windows Explorer.

5. Upon start up, the program will immediately attempt to download data from the Multi-zone, as indicated by several beeps.

2.8.2 Saving and sending programs

Navigate using your PC keyboard:

• use the UP, DOWN, LEFT, and RIGHT arrow keys to navigate through the screen options

• use the ENTER key to select options

• use the ESC key to go back one step

6. From the EDIT menu, select SYSTEM. The monitors’ LOCATION becomes highlighted, press ENTER to move to the TAG area. Use the Backspace key to remove the existing tag, Enter a new tag, Press ENTER to return to LOCATION and select the next item to be addressed. Note that you cannot change the "SN" or "FIRMWARE" items. Press the ESC key to return to the menu bar.

7. From the EDIT menu, select ZONES. Select a specic zone to identify and set parameters, when REFRIGERANT is selected (Halogen Monitor), scroll through the gas library to locate and select the gas type for that zone.

8. Setting the Alarms, select EVAC LEVEL, use the Backspace key to clear previous setting. Type in the new PPM level, use the same method to set the spill level and leak level.

9. To close or bypass a zone, set the DISTANCE to 0ft.

IMPORTANT: when a modied parameter (zone, system, or calibration) is sent to the Multi-zone monitor, please wait for the computer software to indicate that the download is complete before continuing with any further edits

• When saving to your computer, the program will automatically add ".cfg" to the lename you have entered.

• To send a saved program to the Multi-zone, open the program and connect the PC to the Multi-zone. From the monitor, select SEND SETUP and press ENTER, the saved program will be sent to the Multi-zone.

2.8.3 Trend data

NOTE: creating a trend data le must be done while connected to the Multi-zone

From the computer, select GET TREND DATA and select the zone that you want to trend and press ENTER. The trend data will appear in a list format, press ENTER again to access the le name screen.

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Type the le name in for that particular zone and press ENTER. The le will be saved as a text le that can be converted to an Excel le or printed as is.

NOTE: the TREND le must be saved zone by zone, with a lename per zone

2.8.4 Converting the TREND text tile to an Excel le

Open Excel and the desired le, select "Delimited" format and "Space" as the delimiter. Select "General" as the column data format. The text le will display as an Excel le, when saving, change the le name extension to "xls". Comments or notes may be added to this le as needed and saved.

2.8.5 Saving and printing screens and logs

Open the software while connected to the Multi-zone. After the software receives the program, open the desired screen (e.g., software screen, alarm log, fault log, diagnostic screen, etc.). Use the ALT and PRINT SCREEN key combination on the PC keyboard to capture the image and paste it into a Word document, save and print.

2.8.6 USB type laptops

2.9 Optional current loop interfaces

2.9.1 Optional 4-20 mA DC outputs

Some laptops have USB ports and no RS-232 9-pin ports. A USB-to-serial converter or PCMCIA-toserial converter will be required if a PCMCIA slot is available. You will be required to purchase a PCMCIA card that provides an RS-232 output. This is necessary for Windows Vista and higher versions. We recommend the PCMCIA card manufactured by:

SEALEVEL SYSTEMS, INC www.sealevel.com

Reference part numbers 2105R USB-to-RS-232 or PC-SIO-232 PCMCIA card. A "straight through" RS-232 cable and a DB25-to-DB9 adapter will be required to connect the laptop to the HGM-MZ.

NOTE: the two-output, current loop interface is an option that MUST be ordered separately

Upon installation of the optional 4-20mA DC Interface Board, the Multi-zone has the capability of providing dual 4-20mA DC scrolling current loop outputs for connection to external monitoring devices (e.g., a local loop-powered display or a building management system [BMS]).

IMPORTANT: loop outputs are powered internally. Do not use an external power supply as this can damage the loop card

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User manual | HGM-400 - Multi-zone gas monitor

NOTE: optional remote loop-powered displays are available to view the 4-20mA outputs

The interfaces are set up as follows:

• Loop 1 indicates zone area.

• Loop 2 indicates PPM.

The 4-20mA outputs are scaled to correspond to individual zone numbers and PPM concentrations. Scaling for the 16 (maximum) zone numbers is xed (see table below). The default scaling for the PPM concentrations provides a 0 1000 PPM range for the 4-20mA output, although it can be adjusted through the LOOP2 FACTOR option in the SYSTEM SETUP screen.

(See tables below).

Loop 1 = Zone Loop 2 = PPM

Output Zone Output PPM (Default)

4 mA DC n/a 4 mA DC 0 PPM

5 mA DC 1 5 mA DC 63 PPM

(Default: 0.016 mA DC = 1 PPM)

6 mA DC 2 6 mA DC 125 PPM

7 mA DC 3 7 mA DC 188 PPM

8 mA DC 4 8 mA DC 250 PPM

9 mA DC 5 9 mA DC 313 PPM

10 mA DC 6 10 mA DC 375 PPM

11 mA DC 7 11 mA DC 438 PPM

12 mA DC 8 12 mA DC 500 PPM

13 mA DC 9 13 mA DC 563 PPM

14 mA DC 10 14 mA DC 625 PPM

15 mA DC 11 15 mA DC 688 PPM

16 mA DC 12 16 mA DC 750 PPM

17 mA DC 13 17 mA DC 813 PPM

18 mA DC 14 18 mA DC 875 PPM

19 mA DC 15 19 mA DC 937 PPM

20 mA DC 16 20 mA DC 1000 PPM

2.9.2 4-20 mA DC connections

External devices are connected to the Multi-zone monitor using a shielded dual twisted pair cable. Use any of the remaining service knockouts to gain access to the interior of the monitor, locate the dual 4-20mA DC output connector (see below) and remove it from the circuit board, secure the wire leads to the connector orienting them as shown in the diagram below. Check to make sure the polarity matches the wiring at the external device, when you are through securing the connections, carefully plug the connector back onto the circuit board.

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OUTPUT

User manual | HGM-400 - Multi-zone gas monitor

NOTE: the ground connections of the 4-20mA DC output connector are common

NOTE: the 4-20mA DC output connector are SIGNAL OUT ONLY.

DO NOT APPLY POWER

NOTE: it is highly recommended that a current loop isolator is used when connecting to the 4-20 outputs. Danfoss recommends the "Dataforth DSCL 21 Loop powered isolator DIN mount". More detailed information can be found at www.dataforth.com

NOTE: when one or both current loop outputs are not used, install a jumper wire between the ground and the unused loop terminal(s) to prevent the system from generating a current loop fault

Optional dual 4-20 mA DC output board for the Multi-zone

CAUTION: the loop outputs have isolated grounds, therefore the cable shield should be

terminated at the receiver and not the Multi-zone monitor. The signal for both current loops must be returned to the Multi-zone monitor

Optional dual 4-20 mA DC output board and connector

Groung connection

are common

RETURN ZONE PPM

Loop 1 (zone)

Loop 2 (PPM)

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COMMON

User manual | HGM-400 - Multi-zone gas monitor

2.10 Connecting external alarms

2.10.1 Over v iew

The Multi-zone monitor includes four SPDT relays whose contacts are rated 2A at 250VAC (inductive) and 5A at 250VAC (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.

2.10.2 Connection

Use the conduit or any of the remaining service knockouts to gain cable access to the interior of the monitor, locate the relay connector, (see Figure "Multi-zone Monitor Interior Components") and remove it from the circuit board. Secure the leads to the connector orienting them as shown in the diagram below, when you are through securing the connections, carefully plug the connector back onto the circuit board.

Multi-zone monitor relay connector

Relay 1

leak

Each relay may be connected as normally open (NO), or normally closed (NC). The relay contacts are rated 2A at 250VAC (inductive) and 5A at 250VAC (resistive).

Power for the alarm devices connected to the relay contacts may be supplied by an external 24VDC power source or the monitor’s AC input terminals. In the rst wiring diagram, power to this device is being tapped o the monitor’s AC input. In the second wiring diagram, power is supplied from an external power source.

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.

Relay 2

spill

Relay 3

evaquate

Relay 4

fault

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).

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Typical AC external alarm relay 1 wiring

Strobe/horn

GND

LINE1

LINE2

neutral

COM

Relay 1

leak

AC power supply

FUSE

COM

Relay 2

spill

COM

Relay 3

evaquate

COM

Relay 4

fault

Typical DC external alarm relay 1 wiring

+ -

24 VDC power supply

FUSE

Relay 1

leak

Strobe/horn

COM

Relay 2

spill

COM

Relay 3

evaquate

COM

Relay 4

fault

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3.0 Setup programming

3.1 Initial power up

When the Multi-zone monitor is powered up, all front panel LEDs will illuminate and a splash screen will appear, displaying the monitor’s rmware version level. Note that on CO2 models, a "Clearing Purge Line" message is displayed for approximately 2.5 minutes before warm up begins. After a moment, the "Warm Up" screen will be displayed and the green MONITOR ON light will blink.

After a 15 minutes warm up cycle, the MONITOR ON light will glow steadily and the "Data Display" screen will be displayed. (See 8.0 "Appendix C").

3.2 Data display screen

Data display screen and front panel keypad

3.3 Navigating to the 1st setup screen

SILENCE

From the Data Display Screen, press the UP or DOWN arrow key. SETUP will be highlighted in the rst box, press ENTER to select this option and display the SETUP screen (see below).

System setup screen #1

ESC

ENTER

Use the ARROWS key for multi-directional movement in making selections and moving the cursor

Use the ENTER key to initiate and complete a selection

Use the ESC key to go back during programming or to silence an alarm in alarm mode

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3.4 Navigating to the 2nd setup screen

From system setup screen #1, select the SYSTEM option to go to system setup screen #2. Select the ESC key to return to the system setup screen #1.

HGM system setup screen #2

3.4.1 Location

This is the name you assign to the Multi-zone monitor to identify its location. It may have up to 12 alphanumeric characters.

3.4.2 Number of zones installed

3.4.3 Alarm acknowledge mode

1. Press the ENTER key to adjust the setting.

2. Use the LEFT/RIGHT cursor keys to move across the entry eld and the UP/DOWN cursor keys to modify the individual characters.

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

IMPORTANT: do not change the number of zones to deactivate unused zones. Changing the number of installed zones is only necessary when manifold blocks are added or removed. Go to the individual zone that you wish to disable and set its distance to zero

1. Press the ENTER key to adjust the number.

2. Use the UP/DOWN cursor keys to modify the number (must be 4, 8, 12, or 16).

3. Press ENTER to accept the new number or ESC to revert to the previous setting.

This function programs the relays in the unit for latching or non-latching operation.

1. Press the ENTER key to adjust the setting. Use the UP/DOWN cursor keys to toggle between settings:

• AUTO non-latching (alarm relay will automatically de-energize when the gas level drops below its alarm point).

• MANUAL latching (alarm relay remains energized, and will not release until the alarm condition has been manually acknowledged). (See 4.4.4 "Acknowledging Alarms").

2. Press ENTER to accept the new entry or ESC to revert to the previous setting.

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3.4.4 Audible alarm

This parameter selects the function of the Multi-zone monitors internal audible alarm device.

1. Press the ENTER key to adjust the setting.

2. Use the UP/DOWN cursor keys to select unused, monitor on, evacuate, spill, leak, fault, or alarm.

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

NOTE: in "Monitor On" mode, the unit will only give audible alarms on a critical fault that stops the unit from monitoring

3.4.5 Zone hold

Sets the length of time a zone will be monitored when the zone hold feature is activated. The default is 15 minutes and the range is 1 to 999 minutes.

1. Press the ENTER key to adjust this setting.

2. Use the LEFT/RIGHT cursor keys to move across the entry eld and the UP/DOWN cursor keys to modify the individual numbers.

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

3.4.6 Detection limit

3.4.7 Loop mode

This is essentially a squelch setting that instructs the instrument to interpret PPM readings below the designated level as 0 and the range is 1 to 99 PPM.

1. Press the ENTER key to adjust the setting.

2. Use the UP/DOWN cursor keys to modify the setting.

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

This sets the loop mode of the two optional 4-20mA outputs, the options are:

• track zones mode (default)

• highest PPM concentration mode

NOTE: Both LOOP MODE (for selecting track zones or highest PPM mode) as well as the LOOP2 FACTOR (for scaling the PPM output) are congured from the SETUP menu. Congure one, then press ENTER to access the other

In track zones mode the Multi-zone adjusts the ZONE and PPM outputs to correspond to the latest sampled zone number and its corresponding PPM concentration, respectively. For example, if the Multi-zone samples zone #9 at 63 PPM, the ZONE and PPM outputs would read 13mA (corresponds to zone #9) and 5mA (corresponds to 63 PPM), respectively, until the next zone is sampled. This continues in a cyclic fashion through each zone. Note that this example assumes LOOP2 Factor was left at its default value (0.016). This can be adjusted through the LOOP2 FACTOR option in the SYSTEM SETUP screen.

In highest concentration (PPM) mode the Multi-zone adjusts the two current outputs to correspond to the zone number that has the highest PPM concentration and the corresponding value of that concentration, respectively. Unlike track zones mode, this mode will adjust the two outputs to correspond to whichever zone has the highest PPM concentration. For example, if zone #9 is sampled at 125 PPM, the two 4 20mA outputs will read 13mA and 6mA, respectively, as long as it continues to sample at 125 PPM or until a dierent zone samples a concentration greater than 125 PPM.

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3.4.8 Loop2 factor

This sets the PPM scale factor for current loop number 2. After setting the loop mode, the menu box changes to a lower-level menu that allows you to set the Loop2 Factor. To calculate the current output, multiply the scale factor by the PPM and add 4. For example, at the default scale factor of 0.016, a measurement of 100 ppm would generate a current output of 5.6mA DC, the current output cannot exceed the 20mA DC capacity of the interface.

1. Press the ENTER key to adjust the setting.

2. Use the LEFT/RIGHT cursor keys to move across the entry eld and the UP/DOWN cursor keys to modify the individual characters.

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

NOTE: both LOOP MODE (for selecting track zones or highest PPM mode) as well as the LOOP2 FACTOR (for scaling the PPM output) are congured from the SETUP menu. Congure one, then press ENTER to access the other

3.4.9 Re-zero mode

This parameter denes the frequency at which the instrument re-zeros the optical sensor.

1. Press the ENTER key to adjust the setting.

2. Use the UP/DOWN cursor keys to toggle between settings:

• AUTO sets the instrument to re-zero every 10 minutes.

• ZONE CHANGE sets the instrument to re-zero at each zone change. This is the most accurate setting, but increases the time interval between measurement cycles.

3.5 Navigating to the 3rd setup screen

3.5.1 Overview

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

From system setup screen #2, select the MORE option to go to system setup screen #3. Select the BACK option to return to system setup screen #2.

System setup screen #3

RS485 BAUD 19200

NODE ADDRESS

PASSWORD

SYSTEM SETUP

000

BACK

NOTE: the RS-485 BAUD rate text is replaced by "Service Timeout" when in Service Mode

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3.5.2 Baud rate

This parameter denes the baud rate for the RS-485 communications port.

1. Press the ENTER key to adjust the setting.

2. Use the cursor keys to scroll through a list of available baud rates to select the desired baud rate.

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

3.5.3 Node address

Each monitor on the network must has a distinct node address. The node address may be set from 1 to 64.

1. Press the ENTER key to adjust the setting.

2. Use the LEFT/RIGHT cursor keys to move across the entry eld and the UP/DOWN cursor keys to modify the individual numbers.

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

3.5.4 Password

This eld is used to dene a system password. The default setting is 000, which provides no password protection.

1. Press the ENTER key to adjust the password.

2. Use the LEFT/RIGHT cursor keys to move across the entry eld and the UP/DOWN cursor keys to modify the individual alphanumeric characters.

3. Press ENTER to accept the new password or ESC to revert to the previous setting.

3.6 Additional service features

NOTE: after entering the password (including the 1st time it is set), the Multi-zone begins

a 30 minutes "inactivity" timer that is reset every time a key is pressed. When the timer reaches zero, password access is enabled. To enable password protection sooner, cycle power on the Multi-Zone. When password protected, a password entry is required in order to view screens other than the SYSTEM or ZONE VIEW screen

The Service Mode option is located on the System Setup Screen in the bottom right corner. When activated, the Service Mode will disable the Multi-zone unit for a specied length of time. The default is 5 minutes, this time interval can be changed as described in the Service Timeout section below.

IMPORTANT: note that while in the Service Mode no measurements are made, nor are any alarms activated

Access the service mode options from the initial Data Display Screen. Press the SERVICE MODE ENTRY option twice within 3 seconds, to exit the Service Mode, again press the SERVICE MODE ENTRY option twice within 3 seconds.

Several features can be viewed on the System Setup Screen #3 when the monitor is placed in service mode. While in service mode, the user can identify the model number, set digipot values and sensor temperature, and acquire the temperature coecient.

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System setup screen #3 (service mode)

SERV TIMEOUT 300 MINUTES

SYSTEM SETUP

DET DIGIPOT

180

3.6.1 Service timeout

3.6.2 DET digipot

NODE ADDRESS

PASSWORD

000

MODEL 30155043

Displayed in Service Mode. Sets the length of time the Service Mode is in eect, stops the monitor for up to 300 minutes (5hrs) to allow for servicing the unit.

1. Press the ENTER key to adjust the setting.

2. Use the LEFT/RIGHT cursor keys to move across the entry eld and the UP/DOWN cursor keys to modify the individual numbers.

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

The DIGIPOT function allows manual and a more precise adjustment of the digital potentiometer, which controls the voltage of the IR Detector. The DIGIPOT is auto tuned at every power up.

SENSOR TEMP C

0.00000

ACQUIRE

TEMPCO

IR DIGIPOT

124

BACK

3.6.3 Node address

3.6.4 Sensor temperature coecient (for factory use only)

1. Press the ENTER key to adjust the setting. Once the option is selected the screen will also display the voltage.

2. Use the UP/DOWN cursor key to modify the digipot value.

Each monitor on the network must has a distinct node address. The node address may be set from 1 to 64.

1. Press the ENTER key to adjust the setting.

2. Use the LEFT/RIGHT cursor keys to move across the entry eld and the UP/DOWN cursor keys to modify the individual numbers.

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

This eld is typically for factory use only. A customer may need to enter a temperature coecient if the IR bench is replaced and a new temperature coecient is supplied with the replacement bench. Note, however, changing this setting will void the calibration.

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3.6.5 Password

This eld is used to dene a system password. The default setting is 000 (no password protection).

1. Press the ENTER key to adjust the password

2. Use the LEFT/RIGHT cursor keys to move across the entry eld and the UP/DOWN cursor keys to modify the individual alphanumeric characters

3. Press ENTER to accept the new password or ESC to revert to the previous setting

3.6.6 Acquiring temperature coecient (for factory use only)

This eld is for factory use only. Changing this setting will void the calibration.

3.6.7 IR digipot

This option indicates the electrical parameters of the infrared emitter.

3.7 Establishing the CO2 sensor baseline

At power up, an automatic zeroing sequence establishes the CO2 sensor baseline. At that time, the Multi-zone assumes the default ambient CO2 level of 386 ppm, however, if:

• the purge line wasn’t connected to the instrument, or

• the purge line was not terminated in fresh air

Then the sensor baseline may be compromised. If you suspect that the baseline was compromised, then you can re-establish the proper CO2 sensor baseline by ensuring the purge line is properly installed and following the procedure below.

1. Restart the monitor by either (a) cycling the power, or (b) pressing the CPU reset switch on the main printed circuit board, (see gure below).

Location of CPU reset button

CPU Reset Switch

WARNING: if using the CPU reset switch to restart the instrument, extreme care should be exercised when accessing the interior of the monitor. This includes touching a non-painted area of the Multi-zone chassis to provide proper grounding prior to touching the CPU reset switch or any other internal components. Failure to touch a grounding area can allow static electricity on your clothing or body to damage the monitor. Such damage is not covered under warranty

2. After the restart and the warm-up have completed, the instrument is ready for use.

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4.0 General operation

4.1 Functional overview

Normally each Multi-zone monitor will sequentially perform measurements on its active zones without user input. The total time it takes a Multi-zone monitor to complete a measurement cycle is directly proportional to the number of active zones and the physical length of the air lines. Monitors linked together on a network operate independently of each other and consequently complete their respective measurement cycles at dierent rates.

The Remote Display operates by polling the network approximately once every 12 seconds to determine the current status of the Multi-zone monitors. If more than one Multi-zone is connected to the network, it will sequentially poll each monitor for its status. As a practical matter this simply means that the more complicated the network, the longer it will take the Remote display to update the status information for all zones.

4.2 The zone setup screen

From System Setup Screen #2, scroll DOWN to select the ZONES option.

4.2.1 Location

Zone setup screen #1

LOC: LOCATION

LOCATION ZONE 01 LOC

REFRIGERANT R134A

DISTANCE + EXH 0100 FT

TREND

This is the name you assign to the Multi-zone monitor to identify the zone location. It may have up to 12 alphanumeric characters.

1. Press the ENTER key to adjust the setting.

2. Use the LEFT/RIGHT cursor keys to move across the entry eld and the UP/DOWN cursor keys to modify the individual characters.

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

ZONE 01 SETUP

TEMP AT ZONE

00000

LAST PPM

LOG INTERVAL

25 DEG C

0010 MIN

4.2.2 Gas/refrigerant type

This parameter denes the kind of gas the Multi-zone is detecting.

1. Press the ENTER key to adjust the setting.

2. Use the LEFT/RIGHT cursor keys to select the type of gas you want the device to detect. (Options dier depending on model).

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

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ZONE 01 SETUP

DISTANCE + EXH 0100 FT

TEMP AT ZONE

25 DEG C

00000

LOG INTERVAL

0010 MIN

LOCATION ZONE 01 LOC

LOC: LOCATION

REFRIGERANT R134A

LAST PPM

TREND

ZONE 01 SETUP

EVAC LEVEL 00500 PPM

PRESS TO

RESET PEAK

00009

LEAK LEVEL 00100 PPM

PEAK PPM STP

5/27/2011

10:57:59

SPILL LEVEL 0300 PPM

BACKTREND

User manual | HGM-400 - Multi-zone gas monitor

4.2.3 Distance + EXH

This parameter denes the combined length of the sample tubing plus any tubing on the exhaust port. Total length should not exceed 1200ft.

1. Press the ENTER key to adjust the setting.

2. Use the LEFT/RIGHT cursor keys to move across the entry eld and the UP/DOWN cursor keys to modify the individual characters.

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

4.2.4 Temp @ zone

This parameter is used to set the expected temperature of the air at the zone being sampled. The value is used to calculate the STP PPM value shown in the diagnostic screen only.

1. Press the ENTER key to adjust the setting.

2. Use the LEFT/RIGHT cursor keys to move across the entry eld and the UP/DOWN cursor keys to modify the individual characters.

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

4.2.5 Current detection reading

This reading displays the current PPM level of the selected gas.

4.2.6 Log interval

4.3 Navigating to the 2nd zone setup screen

The Multi-zone retains a data log of 100 measurements for each zone, the log interval is the number of minutes from 1 to 1440 between each log point. This parameter can be changed from Zone Setup Screen #1.

The default setting for this parameter is 10 minutes. If the log interval time is set to 0, then a measurement is recorded in the trend log after every measurement cycle. Therefore, after the trend log is lled, it will contain the last 100 measurement points for a zone. If you want the data logged less frequently, increase this value. It is important to remember that cycle time is dependent on many factors, including the number of zones monitored, input line length, and the run zeroing mode selected. Before changing this value it may be useful to rst review the log data using the Trend Screen to determine the nominal cycle time.

Select the MORE option at the bottom right side of the rst Zone Setup screen to continue to the next screen containing more options. This screen displays the peak PPM value in the upper left side of the screen.

Navigating from the rst to the second zone screen

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4.3.1 Leak level

This is the concentration level in PPM that will activate a leak alarm condition.

1. Press the ENTER key to adjust the value.

2. Use the UP/DOWN cursor keys to modify the setting.

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

NOTE: the leak level value must be less than the spill level

4.3.2 Spill level

This is the concentration level in PPM that will activate a spill alarm condition.

1. Press the ENTER key to adjust the value.

2. Use the UP/DOWN cursor keys to modify the setting.

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

NOTE: the spill level value must be less than the evacuation level and greater than the leak level

4.3.3 Evacuation level

4.3.4 Re-setting the peak PPM value

4.4 Alarms

4.4.1 Functional overview

This is the concentration level in PPM that will activate an evacuate alarm condition.

1. Press the ENTER key to adjust the value.

2. Use the UP/DOWN cursor keys to modify the setting.

3. Press ENTER to accept the new entry or ESC to revert to the previous setting.

NOTE: the evacuation level value must be greater than the spill level

Pressing this key resets the current peak PPM level stored in memory and displays it at the top of the screen.

If the PPM level for any zone exceeds its designated spill, leak, or evacuate thresholds, an alarm condition will be created. Once the Multi-zone monitor completes a measurement cycle in the aected zone the alarm condition will be indicated. At that time the red ALARM LED on the Multi-zone monitor will glow. Additionally, an external alarm device may activate and an audible alarm may sound if those features have been enabled.

The next time the Remote display polls the aected monitor its red ALARM LED will glow. Additionally, an external alarm device may activate and an audible alarm may sound if those features have been enabled.

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4.4.2 Responding to alarms

An operator can respond to the alarms by accessing the Alarm Summary Screen. Navigate to this screen by selecting ALARM on the rst (Data Display) screen.

Alarm summary screen

ALARMS

EVAC ZONE 01 LOC

EVAC 1561 ZONE 02 LOC

The Alarm summary screen displays a list of all alarm conditions pending across the network. The screen is divided into 8 boxes, and each box represents a single alarm. If more than 8 alarms are pending, the MORE option will be displayed at the bottom of the screen to permit access to that additional information.

PPM

4.4.3 Alarm detail screen

Each box displays the zone number, zone name, and the current PPM reading. A ashing box indicates an alarm that has not been acknowledged. A static box represents an alarm that has been acknowledged, but has not yet been cleared from the system.

To further investigate an alarm, press the ENTER key to go to the Alarm detail screen.

Alarm detail screen

The Alarm Detail Screen displays more comprehensive information about the nature of the alarm including:

• complete location information

• gas type and current concentration (CONC NOW)

• peak concentration and peak time

• alarm type, alarm time, and date

This screen provides the following navigation options at the bottom of the display:

• ACK: using the LEFT key, acknowledges the alarm as described in the next section.

• SETUP: using the RIGHT key, navigate to the Zone Setup Screen #1. This enables review of the zone setup parameters and access to the Trend Screen.

Use the ESC button on the front case to go back to the previous menu.

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4.4.4 Acknowledging alarms

Each pending alarm may require, depending upon selected alarm mode, acknowledgment before the system returns to normal operation, (see 3.4.3. "Alarm acknowledge mode"). To acknowledge an alarm, navigate to the Alarm Detail Screen and select the ACK option as previously described. You will then be returned to the Alarm Summary Screen and the box associated with that alarm will no longer be blinking, indicating that the alarm has been acknowledged.

Repeat this procedure to acknowledge any remaining alarms.

Alarm summary screen (acknowledge mode)

ALARMS

ACKD ZONE 01 LOC

EVAC 1561 ZONE 02 LOC

PPM

4.4.5 Silencing an alarm

Once all the alarms associated with a given Multi-zone monitor are acknowledged, its RED LED will turn o and any external alarms connected to the Multi-zone relays will de-activate. All pending alarms across the entire network must be acknowledged before the Remote Display returns to normal operation. Once that occurs, its RED LED will turn o and any associated external alarms connected to the Remote display relays will de-activate.

Keep in mind that the system will continue to generate new alarms if PPM values above the alarm thresholds are detected.

When alarms are active, the ESC key functions as a silence key. During an active alarm and with the main screen displayed, press the ESC key, this will generate a prompt to "PRESS ENTER TO CONFIRM SILENCE". When ENTER is pressed, the LEAK relay will open and the internal audible alarm (if enabled) will turn OFF, in this way, when the LEAK relay is used to operate strobes and horns, they can be quickly silenced without eecting the SPILL or EVAC, which may be controlling fans or ventilation equipment. This "silence" mode will be indicated by a reverse ashing "S" in the alarm window. "Silence mode" will be automatically canceled if the alarm condition of any zone changes by clearing or elevating to a higher level.

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4.4.6 Clearing the alarm event log

A data log of the last 20 alarm events is retained in memory.

• From the data display screen, press the UP or DOWN key. SETUP will be highlighted in the rst box.

• Press the DOWN key until alarm event log is highlighted, then press ENTER to select this option and display the alarm event log, (see below).

Accessing the alarm event log

4.5 System faults

This screen lists zones in the left column and displays which alarms were associated with each zone as represented by the vertical cursor bar. As you move the bar horizontally using the LEFT/RIGHT keys, the date and time the alarm condition was detected is displayed in the upper right hand corner of the display window.

NOTE: the alarm event log can be reset by pressing a combination of the ENTER and RIGHT buttons while viewing the log

4.5.1 Functional overview

If a system malfunction occurs, the yellow FAULT LED will glow, additionally, an external alarm device may activate and an audible alarm may sound if those features have been enabled,

(see 2.10 "Connecting external alarms" and 3.4.4 "Audible alarm").

The next time the Remote display polls the aected monitor its yellow FAULT LED will also glow. Additionally, an external alarm device may activate and an audible alarm may sound if those features have been enabled (see 2.10 "Connecting external alarms" and 3.4.4 "Audible alarm").

Depending on the nature of the fault, the Multi-zone monitor may or may not continue to operate normally. Under a non-critical fault condition, the Multi-zone will continue to measure and log data, but some peripheral functions may be compromised, under a critical fault condition, action is required for the Multi-zone monitor to operate normally. The table on the following page lists the various fault conditions and explains what action should be taken to correct the problem.

NOTE: the fault codes are cumulative. For example, a code <4200> is both a <4000> "REZERO VOLT TOL" and <0200> "GAIN SET FAULT" combined, indicating two simultaneous faults

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4.5.2 Navigating to the fault screen

Displayed on the initial data display screen is a fault option, scroll down with the cursor key and select this option, which will introduce you to the fault screen.

Fault screen

4.5.3 Critical faults

Fault Code Description/possible causes

NO FLOW ON ZONE <0800> Go to the data display screen and press the FAU LT

key. This will display a "NO FLOW" message in each individual zone aected. Check for a blockage in the air sample line or at the line end lter, once the blockage has been cleared, the Multi-zone monitor will return to normal operation after the zone has been sampled

NOTE: this can take some several minutes since it is dependent upon how many zones there are and their lengths. The Multi-zone will clear the fault the next time it polls the eected zone and the Remote display will return to normal operation the next time that it polls the Multi-zone

NO FLOW ON PURGE <1000> Check the purge line for a blockage. Verify that the

length of the purge line and exhaust line do not exceed 500ft in length

CLIPPING FAULT <8000> The detector voltage may be out of tolerance.

For information on troubleshooting this type of fault,

(see 5.3 "Troubleshooting")

REZERO VOLT TOL <4000> The detector output voltage is out of tolerance.

For information on troubleshooting this type of fault,

(see 5.3 "Troubleshooting")

OVER RANGE DETECTED

ZERO FILTER FAULT <0100> Indicates contamination in the purge air, or if a

<2000> This indicates that the measured concentration on

one or more zones have exceeded the measurement range. For information on troubleshooting this type of fault, (see 5.3 "Troubleshooting")

charcoal lter is in use, the lter may need to be changed

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Fault Code Description/possible causes

GAIN SET FAULT <0200> Indicates sensor gain (digipot) is outside acceptable

A2D FAU LT <0400> Analog to digital converter not working

BOX TEMP FAULT <0001> Enclosure’s internal temperature is outside normal

BENCH TEMP FAULT <0002> Optical bench is outside of normal operating range

range. For information on troubleshooting this type of fault, (see 5.3 "Troubleshooting")

range (or IR sensor has failed). Check the installation to verify that the monitor is not being subjected to extreme temperatures. Verify that the ventilation holes are not obstructed. Refer to the diagnostic screen for the ZERO temperature, BNCH temperature and BOX temperature. Call the factory with this information for further instructions

(or sensor has failed). Check the installation to verify that the monitor is not being subjected to extreme temperatures. Check the diagnostic screen for the ZERO temperature, BNCH temperature and BOX temperature. Call the factory with this information for further instructions

4.5.4 Reset to factory default settings

PRESSURE SENSOR <0004> Manifold pressure is outside normal operating range

(or sensor has failed). Check the diagnostic screen record ALL data. Call the factory with this information for further instructions

RS -485 FAULT <0008> RS-485 communications error

LOOP FAULT <0010> This would only be displayed if the dual 4-20mA DC

option was installed and one or both current loops are open. Check the wiring to load/monitoring circuit on both 4-20mA loops

CONFIG FAU LT <0080> There is an error in Setup Screen #2 - Number Zones

Installed eld, or in RDM Setup Screen #1 - Number of Multi-zone monitors on Network eld. Check that the number of zones installed for each Multi-zone unit and the actual number of Multi-zone units on the network are properly programmed. Check to ensure that the manifold solenoid cable connector in each Multi-zone unit is securely fastened to its terminal connector. If necessary, reset to the factory default settings

NOTE: performing this function wipes out all program parameters, alarms, faults, trends and log les

1. Press and hold down the UP and DOWN keys on the Multi-zone monitor.

2. Cycle AC power OFF then ON.

3. Hold the keys until the second beep is heard.

4. The screen will indicate "This unit has been reset to factory default conditions".

5. Release the keys.

6. Reprogram the Multi-zone as described in this manual.

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4.5.5 Clearing system faults

If the fault condition is associated with an Multi-zone, the monitor will return to normal operation soon after the problem is corrected. At that time the YELLOW LED will turn o and any external alarms connected to the monitor’s alarm relays will also turn OFF. The Remote display will return to normal operation the next time it polls the aected Multi-zone monitor.

Once the system malfunction has been corrected it may take some time for the fault condition to clear completely. If the fault is associated with a specic zone, the Multi-zone must rst cycle back to the aected zone before it returns to normal operation. At that time the YELLOW LED will turn OFF and any external alarms connected to the monitor’s alarm relays will also turn OFF. The Remote display will return to normal operation the next time it polls the aected monitor.

4.5.6 Viewing fault log

A data log of the last 20 fault conditions is retained in memory. On the fault screen, select the LOG option to view a display of the fault log.

Fault log screen

This screen lists potential fault conditions in the left column and displays a check mark indicating which problems were associated with each fault condition as represented by the vertical cursor bar. As you move the bar horizontally using the LEFT/RIGHT keys, the date and time the fault condition was detected is displayed in the upper right hand corner of the display window.

NOTE: anytime the fault status changes, there is an entry in the fault log, both when the fault occurs and when it is cleared

NOTE: the fault log can be reset by pressing a combination of the ENTER and RIGHT buttons while viewing the log

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4.5.7 Viewing ow log

On the fault log screen, press ENTER to access the ow log screen. The ow log displays the last 20 ow events for all zones and the purge port.

Flow log screen

ZONES 1 - 8

UP/DN KEY TOGGLES ZONES

This screen lists the zones in the left column and displays ow data. Use the UP/DOWN buttons to scroll through the zones and the LEFT/RIGHT to scroll through the log data. As you move the bar horizontally, the date and time of the condition is displayed in the upper right hand corner.

The ow log can be reset by pressing a combination of the ENTER and RIGHT buttons while viewing the log.

4.6 The trend screen

4.6.1 Navigating to the trend screen

From the zone screen, select the trend option on the bottom left side, this will open the trend screen.

The trend graph opens with the cursor located over the most recent data point. Use the LEFT/RIGHT keys to move the cursor to dierent data points. Holding a key down will cause the cursor to move rapidly across the screen. As you move the cursor position, the date and time of that reading, along with the PPM value, are displayed at the top of the screen above the graph. The trend graph is automatically scaled to accommodate the largest PPM value displayed. The ZOOM OUT and ZOOM IN options allow you to adjust the vertical scale of the graph.

The trend data is stored on a rst-in, rst-out basis. After 100 trend values have been stored the 101st value will replace the rst value stored. Therefore, in normal operation, when entering trend mode the cursor will be located at the most recent data point. The data points to the left of the initial cursor location will be the next most recent. The data point to the right will be the oldest data point in the buer and will be over written by the next data point.

Trend screen

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NOTE: the trend data log can be reset by pressing a combination of the ENTER and RIGHT buttons while viewing the log

When nished, press the ESC key to revert to the previous screen.

4.7 The calibration screen

4.7.1 Overview

The calibration screen is used to adjust the calibration factor for each gas, it is also used to program the instrument (halogen only) for new gases.

IMPORTANT: changing information on CAL FACTOR will void the factory calibration. Typically, the unit will remain within the factory-calibrated accuracy indenitely and no calibration is required. Complex software algorithms adjust for temperature drift, IR source aging, and pressure changes in order to keep the unit within factory accuracy specications

4.7.2 Navigating to the calibration screen

4.7.3 Calibration procedure (HGM and AGM only)

On the system setup screen, select the calibration option (CAL).

Calibration screen (HGM and AGM only)

The CAL FACTOR is determined by sampling a known dilution of the type of gas to be sampled. Calibration is best performed at or near full scale, it can, however, be done at any concentration, and ideally in the range where maximum accuracy is desired down to, but not below, 100 PPM.

A cylinder of the desired gas at a certied PPM level must be used to assure sampling occurs at ambient conditions, a minimum sample size of 5lt is required.

The Multi-zone monitor should be operating for at least one hour prior to performing a calibration. Prepare the Multi-zone for sampling by initially setting its CAL FACTOR to 1.000. Next, set up the Multi-zone for a logging interval of zero minutes, and place the Multi-zone monitor in its zone hold mode for the zone you wish to use for calibration purposes.

Connect the sample bag directly to the intake port for the zone you have set up and allow the Multi-zone monitor to sample the entire bag, when sampling is complete, view the trend data for the zone used to sample. Read the measured PPM by placing the cursor on the spikes cause by the sample. If the bag was large enough for multiple samples, average the most stable ones.

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The new CAL factor is computed by dividing the known gas value by the measured value, typically this value will be between 0.95 and 1.05. This value is stored in non-volatile memory.

4.7.4 Adjusting calibration factor (HGM and AGM only)

The factory default cal factor for standard units is 1.000. This value may be dierent if the high accuracy option is ordered.

Proceed as follows to adjust the current calibration factor:

• Use the PREV GAS or NEXT GAS options to scroll through the list of gases until the gas you wish to work with is displayed.

• Select the CAL FACTOR option to edit the value.

• Use the LEFT/RIGHT keys to move across the entry eld and the UP/DOWN keys to modify the individual numbers.

• Press ENTER to accept the new entry or ESC to revert to the previous setting.

NOTE: the CO2 calibration is a more complex, 2-point calibration. CO2 units are factory calibrated and not intended to be calibrated in the eld.

(See 5.7.5 "CO2 Atmospheric Concentration")

4.7.5 CO2 atmospheric concentration

Because CO2 is present in ambient air, a relative reading is used to determine the amount of CO2 coming from a leak. The CAL screen oers the ability to manually enter the ambient CO2 concentration. This value is typically in the range of 380-400 ppm, however concentrations may vary slightly based on geographic locations or other factors (the factory default setting is 386 ppm).

IMPORTANT: the ambient CO2 level is set at the factory to 386 ppm and will likely not need to be changed. If, however, the ambient CO2 concentration at your location is known to be a value other than this default value, then the instrument’s ambient CO2 setting may need to be changed

If needed, adjust the ambient CO2 concentration as follows:

• From the SYSTEM SETUP menu, navigate to the CAL screen.

• Ensure the GAS TYPE setting is selected and press ENTER.

• CO2 calibration curve options are displayed. Simply press ENTER to access the ambient CO2 concentration setting (PPM IN PURGE).

• Use the UP/DOWN keys to modify the numbers to set to the appropriate value.

• Press ENTER to accept the new entry or ESC to revert to the previous setting.

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Accessing the CO2 atmospheric concentration setting (PPM IN PURGE)

IMPORTANT: do not alter any other parameters within the calibration menu as this will

alter the factory calibration

4.7.6 Programming new gases (HGM only)

As new gases come into use the Multi-zone monitor allows the addition of these new gases to its on-board gas library. At the end of the gas library list is an option labeled CUSTOM for adding new gases. From the calibration screen use the LEFT/RIGHT to select CUSTOM from the list of gases. Next, press ENTER, and use the UP/DOWN keys to enter the calibration factor. The selection of the matching gas and CAL factor is performed by Danfoss by analyzing the new gas. Once the matching gas is determined, eld calibration is possible by using the same procedure as for other gases. When the new gas entry is complete simply setup the appropriate zone for CUSTOM.

Program the instrument for a new gas as follows:

1. From the calibration screen, use the PREV GAS or NEXT GAS options to scroll through the list of available choices until the CUSTOM option is displayed.

Custom gas screen (HGM only)

2. Select the CUSTOM option. Press ENTER to accept the new entry or ESC to revert to the previous setting.

3. Enter the new CAL Factor as received from Danfoss.

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4.8 Zone hold mode

A zone can be placed on hold and continuously monitored for a length of time determined by the zone hold time value. To place a zone on hold, select the zone at the main run screen, then press and hold down the ENTER key until the unit beeps. The word "HOLDING" will appear in the status box.

While in the hold mode, further investigation of the zone’s status can be made by navigating to that zone’s setup screen #1. To release the zone from the hold mode, press and hold down the ENTER key until the unit beeps and the screen display returns to normal.

4.9 The diagnostic screen

4.9.1 Navigating to the diagnostic screen

On the system setup screen, select the diagnostic option (DIAG).

Diagnostic screen

Programmed length of tubing for active zone

Current active

zone & user

programmed name

Optical sensor

output voltage

Absorbance &

concentration data

Programmed gas

type for active zone Optical bench temp

Chassis temp

Manifold pressure

Vacuum pressure

Ambient pressure

Hexidecimal fault

code

0100 FEET 01 ZONE 1 LOC DET 4.2251V AVE 4.2273V ZERO 4.2267V NOISE 0.0009V

DIAGNOSTIC DATA MODBUS

485RX=8

485TX=15

FUNC=3 REG=0011H

AVEAU 0.00014 UM/L 0.000B

0.001AMB

PPM 0.7B R134A NOW ZERO DELTA BENCH 27.78C F 27.80C -0.02C BOX 29.97C F 29.96C 0.01C PRES 13.63PSIA -085 DP F VAC 11.34PSIA -3.20 DP AMB 14.54PSIA 2.29 DV F FAULT0000 1.000X TC0.0000

Calibration factor (multiplier)

Indicates parameter is out of

tolerance & causing a fault condition

Diagnostic options & controls

Quit;

go back to

SILENCE

ESC

Clears MODbus data

Receive port # bytes

Transmit port # bytes

Modbus function Register address

0.8STP

Temps at last purge & dierence from current temps

Manifold - ambient Vacuum - ambient Manifold vacuum

Temperature compensation (factory use only)

Forces a

purge cycle

ENTER

Pump ON/OFF control

Navigates to next zone

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4.9.2 Diagnostic screen overview

The diagnostic screen contains sensor data and status information useful for trouble shooting various fault conditions. An explanation of the information provided on each line of this screen is listed below, including normal operating ranges.

Field Name Description

xxxx FEET Programmed length of tubing for an active zone

xx ZONE name

DET Detector Voltage - Peak-to-peak output of the IR sensor.

AVE Average Detector Voltage - Running average of the values displayed in line 1

ZERO Zero Voltage - IR sensor output that was stored during the last purge cycle and has the

NOISE A 16 point running average of the noise portion of IR bench output.

AVEAU Average Absorbency - Optical absorbency computed from the Average Detector

UM/L uMoles/L - Absolute concentration in micro-moles per liter of gas based on Noise and

PPM Parts Per Million is the volume concentration referenced to standard temperature and

ZERO Zero Temperature - Displays the sensor and enclosure temperature measured and

Current active zone and user-programmed name. This eld may also show "WARM UP" during warm up mode

In the absence of gas, this value range is 4.100V to 4.300V

same range as line 1

This reading is valuable mostly when gas is not present

Voltage and Zero Voltage. In the absence of selected gas, the absorbency is 0.000AU. When sampling desired gas, its value varies proportionally with the gas concentration

the internal calibration. There are two gures displayed. The rst (annotated by a B) is the actual measurement at the IR bench. The second is the calculated value corrected to ambient conditions (temperature + pressure)

pressure and is computed from the Average Absorbency, Zero Temperature and Ambient Pressure. There are two gures displayed. The rst (annotated by a B) is the actual PPM at the IR bench. The second is a PPM reading normalized to standard temperature and pressure

stored during the last purge cycle in °C

BENCH Bench Temperature - Current IR sensor temperature in degrees C as well as the raw

voltage coming from the temperature sensor. This value can range from ambient to ambient +15°C

BOX Box Temperature - This is the current internal enclosure temperature along with the raw

voltage from the temperature sensor, and has the same range as the Bench temperature

PRES Pressure - This is the current absolute manifold pressure in PSIA along with the output

voltage of the pressure sensor. This value should always be 0.2 to 1.0 PSIA below ambient (AMB)

VAC Vacuum - The vacuum pressure is measured every purge cycle by closing all sample

valves. Its value is typically 2.5 to 4.0 PSIA below ambient pressure

AMB Ambient - Ambient pressure is measured every purge cycle with the sample pump o

and the manifold open. Its value is weather and altitude dependent and can range from

10.0 to 15.5 PSIA

FAULT Fault code listed in hexadecimal. (See Fault Code list)

y.yyyX Calibration multiplier used when measuring concentration

TCx.xxxx Temperature Compensation - magnitude of voltage applied to sensor output

(in volts). Factory use only

MODBUS data

485 RX=x Receive port number of bytes FUNC Function 485 TX=x Transmit port number of bytes REG=xxxxx Register address

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5.0 Maintenance

WARNING: shock hazard! Always disconnect AC power before opening the enclosure of

the monitor

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 a violation of electrical safety standards applicable to this type of equipment

WARNING: electrical installation should be performed by a certied electrician, and must comply with all applicable NEC/CEC and local electrical safety codes

IMPORTANT: the Multi-zone monitor contains sensitive electronic components that can be easily damaged. Do not touch nor disturb any components. Do not dislodge electrical wiring or pneumatic tubing

5.1 Troubleshooting

Certain critical faults may be corrected by checking and adjusting the detector voltage and/or emitter power. These faults include:

• CLIPPING FAULT <8000>.

• REZERO VOLT TOL <4000>.

• OVER RANGE DETECTED <2000>.

• GAIN SET FAULT <0200>.

To troubleshoot any of the above faults, use the procedure listed below.

1. With the monitor in either Warm Up Mode (ashing green LED) or Sampling Mode (solid green LED), access the Setup Menu by pressing the ENTER key twice.

2. Scroll to the bottom right of the screen to select the "Service Mode Entry" option.

3. With the "Service Mode Entry" option highlighted, press ENTER twice to enter Service Mode.

4. Scroll to the "SYSTEM" option and press ENTER.

5. Scroll to the "MORE" option and press ENTER. Note that "MORE" will ash when it is selected.

6. Scroll to and select the "IR DIGIPOT" option, (see below) and press ENTER.

7. Use the UP and DOWN arrows to adjust the MW reading to 450 (or as close as possible). When at the proper value, press ESC once.

Sample DIGIPOT readings

DIGIPOT= 180 IR VOLT= 4.21

V= 4.7 MA= 96 R= 49 MW= 450

8. Scroll to "DET DIGIPOT" option, (see above) and press ENTER.

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9. Use the UP and DOWN arrows to adjust the IR VOLT reading to 4.20 (or as close as possible). When at the proper value, press ESC once.

IMPORTANT: if IR VOLT does not reach 4.200±0.100 volts when adjusting the DIGIPOT, return to step 6 to lower the IR emitter setting. If the IR emitter setting is 450±20mW, adjust the new IR emitter setting to 375±20mW. Repeat step 8 with the new IR emitter setting

10. Press ESC to save.

11. Press ESC to get to the System Menu. Scroll to Service Mode and press ENTER twice to leave Service Mode. Press ESC once and allow the instrument to complete a pressure check and purge cycle (approximately 2 minutes).

If the faults cannot be cleared using the above procedure, call the factory for further assistance.

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6.0 APPENDIX A

Recommended refrigerant gas alarm settings

Gas

Alarm Settings (PPM)

Gas

Alarm Settings (PPM)

Leak Spill Evacuate Leak Spill Evacuate

CO2/R -744 1500 2000 3000 R245FA 100 300 500

FA18 8 100 300 500 R401A 100 300 500

FC72 100 300 500 R402A 10 0 300 500

H1301 100 300 500 R402B 100 300 500

H1211 100 300 500 R404A 100 300 500

H2402 100 300 500 R407A 100 300 500

H1234Y F 10 0 300 500 R408A 100 300 500

HFP 10 0 300 500 R407C 100 300 500

N1230 100 300 500 R409A 100 300 500

NH3/R-717 50 150 300 R410A 100 300 500

R11 100 300 500 R422A 100 300 500

R12 100 300 500 R422D 100 300 500

R21 100 300 500 R424A 100 300 500

R22 100 300 500 R426A 100 300 500

R23 100 300 500 R427A 100 300 500

R32 100 300 500 R438A 100 300 500

R113 100 300 500 R500 100 300 500

R114 100 300 500 R502 10 0 300 500

R123 25 35 50 R503 100 300 500

R124 100 300 500 R507 100 300 500

R125 100 300 500 R508B 100 300 500

R134A 100 300 500 R-717/NH

R227 100 300 500 R-744/CO

50 150 300

150 0 2000 3000

R236FA 100 300 500

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7.0 APPENDIX B

RS-485 communications protocol

7.1 O ve r v iew

The following instructions are intended as a guide for integrating the Multi-zone network into a Building Management System. If you are unfamiliar with complex systems of this type, it is recommended that you contact Danfoss for technical assistance.

7.2 MODbus RTU Protocol

The Multi-zone monitor communicates with master devices (such as the Remote display or a building management system) over the RS-485 serial interface. Because the monitor is congured with a two wire RS-485 serial bus, data transmission occurs in "half-duplex" mode. Therefore, only one device may be in transmit mode at any given time.

This document species the MODbus communications protocol as implemented on the applicable instruments. Programmers should refer to the MODbus protocol reference guide for details and more comprehensive instructions.

7.3 Multi-zone MODbus RTU operation

7.3.1 Overview

7.3.2 Protocol details

The Multi-zone and Remote display are equipped to communicate with other equipment using the MODbus RTU protocol. Using this communications channel a MODbus master device may communicate with up to 15 Multi-zone monitors on a communications network, exchanging measurement information, alarm data, fault data, history (logs and trends) and setup information. Additionally, the MODbus master can control the operating state of an Multi-zone monitor, placing the Multi-zone in any of its dierent operating modes. The network may be congured so that the Multi-zone monitors are connected directly to the MODbus master device, or the MODbus master device may communicate with the Multi-zone through the RD.

NOTE: this document was written with the assumption that the reader is familiar with the various setup parameters and operational modes for the Multi-zone

A 2 wire RS-485 bus is used for transmission, therefore communications occurs in a Half-Duplex mode. The Multi-zone is a slave device and will respond to queries in the MODbus RTU format from a master device.

Two MODbus functions are supported. They are function 03 (read holding register) and function 16 (Preset Multiple registers).

Using the two MODbus functions, a master device may read, modify and write data and status information to any monitor on the network. Data is organized into structures (internal to the Multi-zone monitor) which can be accessed by the MODbus registers dened in this document. A corresponding set of data structures should be maintained by the master device. These master device data structures become the destination for responses to read queries and sources for preset register commands. When a read holding register query is made by the master device the Multi-zone monitor responds by sending the contents of the structure referenced by the specied register. After the master validates the Multi-zone response using the CRC bytes, it must then move the data into its matching data structure before individual items may be accessed or modied.

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Therefore, the master data structure should correspond to the Multi-zone data structure byte for byte.

NOTE: some data structures have been divided into multiple registers due to MODbus RTU message length constrains

To change a setting in the Multi-zone monitor, the master device rst reads the register structure that contains the data item to be modied, makes the desired change, then sends the structure back using the preset multiple register function. If the transaction is successful, the Multi-zone monitor sends the appropriate MODbus response. It is the responsibility of the master device, when making modications, to insure that all parameters transferred are within the working limits of the Multi-zone.

IMPORTANT: each time parameters are modied and sent back to the monitor using function 16 (preset multiple registers), the new values are written to the monitor's non-volatile FLASH memory. Due to the nite write life of the FLASH memory device (10 K-100 K write cycles), modifying and writing variables should be performed on an "as needed" basis and not periodically. Exceeding the FLASH write life can result in memory corruption, requiring a CPU board replacement

7.3.3 Multi-zone monitor polling

After the Multi-zone monitors are setup and operating, the master device need only poll each monitor for its status register which contains summary data of the monitors’ alarms, faults, and operating state. If exceptions are detected through the status register and more details are required, additional registers can be examined. Also if current PPM values are required, the PPM register provides access to current PPM values for all zones.

7.3.4 Network topologies

The Multi-zone monitor requires a minimum of 20 seconds to complete a gas concentration measurement for a single zone. Therefore, it is not necessary to poll the Multi-zone monitor more frequently than once every 15-20 seconds, as there will not be any new data available/obtained by more frequent polling. In fact, excessive polling will slow the operation of the Multi-zone.

Under no circumstances should the Multi-zone monitor be continuously polled at rate faster than 500 ms, as this could result in erroneous readings by the Multi-zone monitor.

Multi-zone monitors may be connected directly to the MODbus network or they may be connected to the network through a Remote Display. In either case, each Multi-zone monitor must have a unique node ID. Up to 15 Multi-zone monitors can be connected directly to the MODbus network.

If Multi-zone monitors are accessed via an Remote display connected to a MODbus network, the RD "BMS enabled" parameter must be set equal to "1" via the "RDM SETUP" screen on the Remote Display. The same commands and registers are used to communicate with the Multi-zone directly or through the RD. If the communications are through the RD, it monitors each MODbus message to determine if the message is intended for one of the Multi-zone monitors it is connected to. If it is, the Remote display passes the message through to the Multi-zone monitors. If it is not, the message is not passed through.

The Remote display does not make any modications to MODbus messages. It simply passes the query through to the Multi-zone monitor, and passes the response back to the MODbus master. In other words, it allows the Multi-zone monitors to be logically connected to the MODbus network, when physically they are connected to the local Remote display network.

IMPORTANT: it is very important to understand that the Remote display will only pass messages through to the Multi-zone monitor when the Remote display is either in the "SYSTEM" screen or the "ZONE VIEW" screen. If the Remote display is in any other screen, it will return a MODbus "busy" exception response (exception code 06)

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All Remote display screens, except the SYSTEM and ZONE VIEW screens, have a 10 minute timeout interval. After this, the screen will return to the SYSTEM or ZONE VIEW screen, depending on which one was last displayed. The Remote display may also be password protected so that a password entry is required in order to view screens other than the SYSTEM or ZONE VIEW screen.

7.3.5 Key comm protocol parameters

Parameter Description

MODbus Mode RTU only

Multi-zone Baud Rate Default is 19.200. Programmable as dened in system data register

Parity No Parity

Stop Bits Default is 1. Can be set for 2 via System data register

Maximum Response Time 4000ms when directly accessing the Multi-zone monitor

Error Checking CRC per MODbus specications

8.000ms when accessing the Multi-zone monitor through the RD

7.3.6 Summary of registers

NOTE: all data sent out from the Multi-zone is in "little endian" byte order

(Least signicant byte followed by most signicant byte). This should be taken into account if the master that process the data is a "big endian" type. Non-data information (starting address, number of points, etc.) follows normal MODbus protocol, which is Big Endian

System Data 0x0010 16 R/W System Setup Data

Status 0x0011 17 R/W Operating summary of faults,

Zone Data 0x12xx 4609-4630 R/W Setup data for up to 16 zones

CAL Data 0x0014 20 R/W Cal Factors for all gases

Date/Time 0x0015 21 R/W Set Multi-zone date & time

Sensor Data 0x0016 22 R Raw measurement of sensors

Rel. Hold 0x0017 23 W Release Multi-zone out of hold mode

Hold Zone 0x0018 24 W Put Multi-zone into hold mode

HEX Decimal Description

alarms and status

(xx denes zone number)

Fault Log 0 x19x x 6400-6401 R 20 most recent fault events

(xx = 00 or 01)

Flow Log 0x001F 31 R 20 most recent ow fault events

Alarm Log 0x1A xx 6656-6658 R 20 most recent alarm events

(xx = 00, 01, or 02)

Serv. Mode 0x001B 27 W Puts Multi-zone into service mode

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7.3.7 System data register 0x0010 (16 Dec) (R/W, 54 Bytes)

Rel Serv. 0x001C 28 W Release Multi-zone from service

PPM 0x001E 30 R PPM values for all zones

Zone Log 0x3yxx 0-6 Trend data for each Multi-zone

Typ e Abbreviations

C Character

Float Floating Point

I Integer

TIM Time

UI Unsigned Integer

HEX Decimal Description

mode

[y = zone # (starting at 0), xx = 00 – 06] Data

Variable Typ e Length Description

Typ e UI 2 bytes Indicates EEPROM has been initialized if value = 300

DO NOT MODIFY

REV Float 4 bytes Firmware Rev Level DO NOT MODIFY

UNUSED UI 2 bytes Firmware Serial Number DO NOT MODIFY

Node UC 1 byte Network Slave Node # (valid values are 1-15). The default is that

indicated by the Node DIP Switch on main board

Location C 13 byte s Array dening text name of unit

Stop_Bits C 1 byte Number of stop bits used in the Multi-zone data stream.

Default = 1. Other available value is 2

Aud_Alarm UC 1 byte Sounds internal board buzzer on condition;

Alarm_Ack_ Mode

Num_Zones UC 1 byte Number of install zones (Value initialized during auto detect

UNUSED TIM 13 by tes UNUSED

Rezero_Mode UC 1 byte Denes re-zero mode.

UC 1 byte Denes Alarm Operation.Manual Acknowledge = 0;

0 = no buzzer; 1= Alarm; 2=Fault; 3=Leak; 4=Spill; 5=Evacuate; 6=Monitor O line (DEFAULT = 0)

Auto Acknowledge = 1 (DEFAULT = 0)

during Power On Self Test)

Auto Re-zero = 0; Re-zero every zone = 1 (DEFAULT = 0)

Hold_Time UI 2 byte Length of zone hold interval in minutes

(DEFAULT = 15 minutes)

UNUSED UC 1 byte Minimum detection limit (in PPM). Concentrations less than or

equal this value will read as 0 PPM (DEFAULT = 0 PPM)

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Variable Typ e Length Description

Avg_ Size UC 1 byte Size of running average used in computing PPM value.

Loop2_factor Float 4 bytes Denes PPM current loop output. (DEFAULT = 0.16mA/PPM)

Serv_Mode_TOUI 2 bytes Service Mode Timeout value (in minutes).

RS-485_BAUD UI 2 bytes BAUD RATE for RS-485 connection (between Remote display

Mode UI 2 bytes UNUSED

7.3.8 Status register 0x011 (17 Dec) (R/W, 10 Bytes)

Variable Typ e Length Description

Mode UC 1 byte Denes Operating Mode of Multi-zone.

DO NOT MODIFY

(DEFAULT = 60 MINUTES)

and Multi-zone monitor or MODbus master and Multi-zone depending on the Network topology). Default=9 (19.2K); other values are 8=9600, 7=4800

0 = normal Mode; 1 = Zone_Hold Mode; 2 = Diagnostic Mode; 3 = Service mode. DO NOT MODIFY (use zone hold register or service mode register to change this parameter)

7.3.9 Fault code table

State UC 1 byte Denes Multi-zone Current State.

0 = Idle; 1 = Sampling; 2 = Zeroing; 3 = Warm Up; 4 = Pressure Check DO NOT MODIFY

Measuring UC 1 byte Value = 1 if unit is acquiring detector signal for running avg.

DO NOT MODIFY

Active_Zone UC 1 byte Current Zone being checked. 0=zone 1; 1=zone 2, etc

Max _Alarm UC 1 byte Indicates highest non-acknowledged alarm level

DO NOT MODIFY

Alarm_Count UC 1 byte Number of alarms that are currently active

DO NOT MODIFY

UNUSED UC 1 byte UNUSED

Loop_Card UC 1 byte Value = 1 if 4-20 mA card has been detected

DO NOT MODIFY

Fault UI 2 bytes Fault Flag Structure uses bitwise access to 16 bit word as

dened in the table below

BIT Fault Type Code Description

15 CLIPPING FAULT 0x8000 0x8000 Sensor output voltage too high

14 ZERO RANGE

FAULT

13 OVER RANGE

FAULT

0x4000 Sensor output voltage outside limits during purge

0x2000 Gas concentration above measurable range

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BIT Fault Type Code Description

7.3.10 Zone data register 0x12xx (R/W, 78 Bytes)

12 PURGE FLOW

FAULT

11 ZONE FLOW FAULT 0x0800 No ow detected during sample cycle

10 A2D FAULT 0x0400 Analog to digital converter not working

9 GAIN SET FAULT 0x0200 Digipot gain setting out of normal range

8 ZERO FILTER FAU LT 0x0100 Charcoal lter (if used) needs replacement

7 CONFIG FAULT 0x0080 No zones are enabled

6 UNUSED FAULT 2 0x0040

5 UNUSED FAULT 1 0x0020

4 LOOP FAULT 0x0010 Current loop is open

3 R S - 485 FAULT 0x0008 Communications error

2 MANIFOLD P FAULT 0x0004 Pressure sensor readings are out of range

1 BENCH T FAULT 0x0002 Sensor temperature is out of range

0 BOX T FAULT 0x0001 Chassis temperature is out of range

Each zone for an Multi-zone has a separate zone data structure that is 78 bytes long. The zone number is the low order byte in the register address (e.g., Zone 1 data register = 0x1201h).

0x1000 No ow detected during purge cycle

Variable Type Length Description

Location C 13 byte s 13 byte array, Alpha Numeric Description or Name of Zone

Flow OK UC 1 byte Status of Flow check.

Value of 1 indicates ow check is good. DO NOT MODIFY

Refrigerant Typ e

Distance UI 2 bytes Zone Tubing Length (in feet)

Zone Te mp I 2 bytes Average temperature at zone (degrees C) (DEFAULT = 25°C)

Concentration Float 4 bytes Last Measured concentrations (uM/L) DO NOT MODIFY

Concentration2 Float 4 bytes Last Measured concentration (PPM) DO NOT MODIFY

Alarm Ack UC 1 bytes NOTE: Multi-zone will reset this byte to 0 when

Alarm UC 1 bytes Alarm Status; 0 = no alarm; 1 = leak; 2 = spill; 3 = evac

Leak Level UI 2 bytes Level to trigger a leak alarm (in PPM) (DEFAULT = 100)

Spill Level UI 2 bytes Level to trigger a spill alarm (in PPM) (DEFAULT = 300)

UC 1 byte See note 1 Below (DEFAULT = R134a)

(DEFAULT = 100ft [approx. 30.5 meters])

the Alarm byte (below) is = 0 and zone in alarm is sampled. If the alarm condition/byte increases (leak>>spill or spill>>evac) the Multi-zone will also reset this byte to 0

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Variable Type Length Description

Evac Level UI 2 bytes Level to trigger a evacuate alarm (in PPM) (DEFAULT = 500)

Peak PPM UI 2 bytes Highest Recorded PPM in zone

Peak Time TIM 13 bytes Date an time of highest peak, (see note 2 for format)

Alarm Time TIM 13 by tes Date and time of last alarm, (see note 2 for format)

7.3.11 Alarms and alarm acknowledge

Alarm Ack/ Time

Log Interval UI 2 bytes Number of minutes between Log entries (DEFAULT = 1440)

NOTE: (see 6.0 "Appendix A")

NOTE: time structure format consists of 13 unsigned character types.

They are 1 second digit, 10 second digit, 1 minute digit, 10 minute digit, 1 hour digit, 10 hour digit, 1 day digit, 10 day digit, 1 month digit, 10 month digit, 1 year digit, 10 year digit, last byte is unused

The Multi-zone can be operated in two dierent alarm acknowledge modes, Auto and Manual (set via the alarm_ack_mode variable in the system data register). For purposes of this discussion, the term "Alarm" refers to an Multi-zone state where the alarm light is on and the appropriate alarm relay is activated. The term "Alarm condition" refers to the external condition (e.g. refrigerant leak) that initially causes the Multi-zone monitor to go into an alarm. If an alarm occurs it can be handled in one of 3 ways.

1. Non-latching mode: this mode is enabled by setting the AUTO_ACK_MODE parameter in the system register to "1". In this mode, if an alarm condition occurs an Multi-zone alarm will be created. If the alarm condition is subsequently removed, the Multi-zone alarm will automatically be cleared by the Multi-zone monitor when the zone in alarm is sampled "clear". NOTE: in this mode of operation, it is possible for an alarm to occur and be cleared without user or MODbus master intervention. If this is the case, the only evidence of the alarm would be contained in the Multi-zone alarm log

2. Latching mode with silence: this mode is enabled by setting the AUTO_ACK_MODE in the system register to "0". In this mode, if an alarm condition occurs, an Multi-zone alarm will be created. In order for the alarm to be removed the MODbus master will write a "0" to the ALARM parameter in the ZONE register. This will cause the alarm to be "silenced" in the Multi-zone monitor (e.g. the alarm relays will return to their normal state and the ALARM lamp will be extinguished). The next time the zone with the alarm condition is sampled, if the alarm condition still exists, the alarm will be reactivated and the alarm parameter will be reset to "1" in the Multi-zone. Otherwise, if the alarm condition has cleared, no further action is required and normal operation will resume

3. Latching mode without silence: This mode is enabled by setting the AUTO_ACK_MODE in the system register to "0". In this mode, if an alarm condition occurs, an Multi-zone alarm will be created. The Multi-zone MODbus master will then write a "1" to the ALARM ACK parameter in the zone register. The alarm will continue to persists (i.g., Relays in alarm state and Alarm light on) until the oending zone is sampled and no alarm condition is detected. At that point, the ALARM ACK parameter is automatically cleared by the Multi-zone monitor, as is the ALARM parameter

13 by tes

NOTE: if the ALARM ACK parameter is set to "1" and the ALARM CONDITION is upgraded (from leak to spill, or spill to evacuate) the ALARM ACK parameter will automatically be cleared to "0" by the Multi-zone

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7.3.12 Date time register 0x0015 (21 Dec) (R/W, 14 Bytes)

Variable Type Length Description

Date_Time Time 14 byte s Contains current time and date.

Time structure format consists of 14 unsigned character types. They are 1 second digit, 10 second digit, 1 minute digit, 10 minute digit, 1 hour digit, 10 hour digit, a day digit, 10 day digit, 1 month digit, 10 month digit, 1 year digit, 10 year digit, day of the week, last byte is unused.

7.3.13 Sensor data register 0x0016h (22 Dec) (R, 82 Bytes)

Variable Type Length Description

Pressure Float 4 Manifold Pressure is PSIA

P_Vo l ts Float 4 Pressure sensor output Voltage

Vacuum_P Float 4 Pressure with all value closed and pump on in PSIA

Structure is dened as in note 2 of zone data

Ambient_P Float 4 Absolute Ambient Pressure in PSIA

Box _T Float 4 Enclosure Temperature in Degrees C

Box _T_Volts Float 4 Box temp sensor output voltage

Bench_T Float 4 Optical bench temperature in Degrees C

Bench_T_Volts Float 4 Bench temp sensor output voltage

Bench_Z_T Float 4 Optical bench temp in degrees C at last zero interval

Box _Z_T Float 4 Box temp in degrees C at last zeroing

PkPk_int UI 2 Current peak to peak A/D counts from detector

PkPk Float 4 Current peak to peak voltage from detector

Ave_PkPk Float 4 Running average voltage from detector

Zero_PkPk Float 4 Voltage measured at last zeroing

Noise Float 4 Largest Change in running average

AU Float 4 Current absorbance value

Ave_AU Float 4 Running Average of absorbance level

Bench_PPM Float 4 PPM in bench based on zone gas selection

(uncorrected for pressure and temperature)

STP_ PPM Float 4 PPM corrected to STP (1 atm, 25°C)

Bench_UML Float 4 Micromoles/liter in bench (uncorrected)

Ambient_UML Float 4 Micromoles/liter corrected to ambient pressure

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7.3.14 Release zone hold register 0x0017h (23 Dec) (W, 10 Bytes)

Variable Type Length Description

Rel_Hold See description of STATUS REGISTER

7.3.15 Hold zone register 0x0018h (23 Dec) (W, 10 Bytes)

Variable Type Length Description

Zone_Hold See description of STATUS REGISTER

7.3.16 Multi-zone hold mode

The Multi-zone monitor can be made to hold or "dwell" on a particular zone if necessary. The length of the hold time is dened by the HOLD TIME parameter in the system data register.

Placing the Multi-zone monitor into hold mode:

1. Read the Multi-zone status register (0x0011h)

2. Modify the content of the status register structure to change the MODE parameter to zone hold mode. Active zone parameter to the zone you wish to hold

3. Send this updated status register structure back to the Multi-zone using PRESET MULTIPLE REGISTER COMMAND to the HOLD ZONE REGISTER (0x0018h)

Releasing the zone hold:

1. Read the Multi-zone monitor status register (0x0011h)

2. Modify the content of the status register to change the MODE parameter to normal mode. Active zone parameter to the zone which you would like to resume normal activity on

3. Send this updated status register structure back to the Multi-zone using PRESET MULTIPLE REGISTER COMMAND to the RELEASE HOLD REGISTER (0x0017h)

7.3.17 Fault log register 0x1900-01 (6400-6401 Dec) (R, 302 Bytes)

These registers contain the 20 most recent fault events, the time they occurred, and a pointer to the most recent event. The data is split into 2 registers. The rst register contains 200 bytes and the second register contains 102 bytes. The results of these two register reads should be recombined into the Fault Log Data Structure after both have been received.

Variable Type Length Description

Fault UI 40 bytes 20 most recent fault events. Each event is decoded as

Time TIM 260 bytes Time of each fault occurrence.

Ptr UC 1 byte Pointer to most recent event

Unused UC 1 byte Unused

indicated in Fault Flag Structure given after the Status Register Description

TIM value as dened in NOTE 2 of Zone Data

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7.3.18 Flow log register 0x001F (31 Dec) (R, 142 Bytes)

Variable Type Length Description

Flow Event UI 40 bytes 20 most recent ow fault events.

Each bit of the unsigned int represents a zone and a 1 indicates no ow. Zero indicates ow

7.3.19 Alarm log register 0x1A00-02 (6656-58 Dec) (R, 582 Bytes)

These registers contain the 20 most recent alarm events, the time they occurred, and a pointer to the most recent event. The data is split into 3 registers and should be recombined into an appropriate structure after all three registers have been received. Register 0x1A00h contain 200 bytes, Register 0x1A01h contains 200 bytes, and register 0x1A02h contains 181 bytes.

Purge Flow Event

Time TIM 80 bytes Time/date stamps for 20 most recent logged ow events.

Ptr UC 1 byte Pointer to most recent event

Unused UC 1 byte Unused

Variable Type Length Description

Event UC 320 bytes 20 most recent alarm events. Each event contains 1 byte for

Time TIM 260 bytes Time of each alarm event.

UC 20 bytes 20 most recent ow fault events where a 1 indicates no ow.

Zero indicates ow

This variable is an unsigned long integer formatted as seconds since Jan 1 of 1980

each zone. Each zone Byte is dened as 0=No Alarm; 1=Leak Alarm; 2=Spill Alarm; 3=Evac Alarm

TIM value as dened in NOTE 2 of Zone Data

7.3.20 Service mode register 0x001B (27 Dec) (W, 10 Bytes)

7.3.21 Release service mode 0x001C (28 Dec) (W, 10 Bytes)

Ptr UC 1 byte Pointer to most recent event

Unused UC 1 byte Unused

Variable Type Length Description

Rel_Svc_Mode See description of STATUS REGISTER

Variable Type Length Description

Ent Svc_Mode See description of STATUS REGISTER

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7.3.22 Multi-zone service mode

The Multi-zone monitor can be placed into service mode if necessary. During service mode the unit will take no measurements, any and all alarms are silenced, and all relays are opened. The unit automatically comes out of service mode after a preset interval dened by the service_mode_TO parameter in the system data register.

Placing the unit into service mode:

1. Read the Multi-zone status register (0x0011h)

2. Modify the content of the status register structure to change the MODE parameter to service mode

3. Send this updated status register structure back to the Multi-zone unit using PRESET MULTIPLE REGISTER COMMAND to the SERVICE MODE REGISTER (0x001Bh)

Releasing the unit from service mode:

1. Read the Multi-zone status register (0x0011h)

2. Modify the content of the status register to change the MODE parameter to normal mode

3. Send this updated status register structure back to the Multi-zone unit using PRESET MULTIPLE REGISTER COMMAND to the RELEASE SERVICE MODE REGISTER (0x001Ch)

7.3.23 PPM register 0x001E (30 Dec) (R, 32 Bytes)

Variable Type Length Description

PPM UI 32 bytes 16 Unsigned Integers that represent the PPM values for each

7.3.24 Zone log registers 0x3xyy (R, 1502 Bytes)

These registers are used to transfer the zone log data. Each zone has a circular log of 100 past data points. The period between data points is dened by the Log Interval parameter in each corresponding Zone Data Register. The data for each zone is dened by the "x" place in the above register address. For zone 1 the Register address is 0x30yyh, for zone 2 the register address is 0x 31y yh, etc . The data for each zone is sent in 8 consecutive registers due to MODbus RTU message length constrains. The addresses are dened by the "yy" place in the above address. For zone 1, all log data can be obtained by reading 0x3000h, 0x3001h, 0x3002h, …… , 0x3007h. The rst seven registers contain 200 bytes each and the last register contains 102 bytes. After all registers have been received the data should be reassembled into the full data structure.

Variable Type Length Description

Index UI 2 Point to current reading

Time TIM 130 0 Time record for each of the 100 log points. The format for the

Multi-zone monitor zone

NOTE: 16 values are returned independent of the number of actual zones installed in the unit. The master device is required to know how many zones are installed in the unit (available in the system register) in order to properly interpret the data

TIM type is dened in note 2 of zone data

PPM UI 200 Last 100 log points (2 byes per point)

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7.3.25 MODbus exception responses

The following MODbus exception responses are supported by the unit.

• 01 Illegal Function.

• 02 Illegal Data Address.

• 03 Illegal Data Value.

• 06 Slave Device Busy. (Occurs only when Multi-zone is connected to the bus through an Remote display and the Remote display is not in the SYSTEM or ZONE VIEW screen).

7.3.26 MODbus gas enumeration

The following table provides decimal and hexadecimal MODbus enumerations for supported refrigerant.

Refrigerant Gas DEC HEX Refrigerant Gas DEC HEX

CO2/R -744 0 00 R508B 21 15

NH3/R-717 0 00 H1301 22 16

R11 0 00 R408A 23 17

R12 1 01 FA188 24 18

R22 2 02 R236FA 25 19

R23 3 03 N1230 26 1A

R113 4 04 R227 27 1B

R114 5 05 HFP 28 1C

R123 6 06 FC72 29 1D

R124 7 07 R21 30 1E

R134A 8 08 R125 31 1F

R4 01A 9 09 H 1211 32 20

R402A 10 0A H2402 33 21

R402B 11 0B R245FA 34 22

R404A 12 0C R422A 35 23

R4 07A 13 0D R422D 36 24

R407C 14 0E R 427A 37 25

R409A 15 0F H123 4YF 38 26

R410A 16 10 R424A 39 27

R500 17 11 R426A 40 28

R502 18 12 R438A 41 29

R503 19 13 R32 42 2A

R507 20 14

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8.0 APPENDIX C

Multi-zone system map

Sample setup screen

Access via service mode

Navigating to a zone:

- Select the zone in the list on the status screen & press ENTER or

- Select ZONES on the 1st setup screen

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Multi-zone system map

Sample alarm and fault screen

Navigating to a zone:

- Select the zone in the list on the status screen & press ENTER or

- Select ZONES on the 1st setup screen

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9.0 Replacement parts & optional accessories

Replacement Parts

Part Number Item Description

08 0Z2151 HGM-400 - 8 ZONE LEAK DETECTOR

08 0Z2152 HGM-400 - 12 ZONE LEAK DETECTOR

08 0Z2153 HGM-400 - 16 ZONE LEAK DETECTOR

Optional Accessories

Part Number Item Description

08 0Z2198 Hydrophobic Filter

080Z2199 Line End Dust Filter

C0170320 0 250 Foot Roll of Tubing (sold per roll)

C01680 417 Charcoal Filter

C01680 421 HGM Line End Filter

* Installation kit

* Management kit

* The part number changes according to the region, please contact you local Danfoss oce

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Danf already on order pro All trademarks in this material are property of the respec

Please contact your local Danfoss oce for further information

oss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products

vided that such alterations can be made without subsequential changes being necessary eady agreed.

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Danfoss HGM-400 User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

1.0 Introduction

1.1 About this manual

1.2 Warning and caution conventions

1.3 Safety precautions

1.4 Key external hardware components

1.5 Functional overview

1.5.1 General description

1.5.2 Communications options

1.5.3 Understanding monitoring levels

1.5.4 Response to the presence of multiple refrigerants (HGM Only)

1.5.5 Suggested location of sampling points

1.5.6 Locating a remote display (optional)

2.0 Installation

2.1 Installation considerations

2.1.1 Warnings and cautions

2.1.2 Inspection

2.1.3 Location of the monitor

2.1.4 Mounting instructions

2.2 Connecting gas sample lines

2.2.1 Overview

2.2.2 Tubing considerations

2.2.3 Connecting purge line

2.2.4 Connecting exhaust Line

2.2.5 Connecting sample intake lines

2.2.6 Installing an optional splitter kit

2.2.7 Connecting the water trap

2.3 Interior components

2.4 Electrical wiring

2.5 Connecting communications devices

2.5.1 Remote display module (RD) connection

2.5.2 Integrating with building management systems

2.5.3 Larger integrated systems

2.5.4 Changing terminator switch settings

2.5.5 Personal computer

2.6 Terminating multiple monitors

2.7 Connecting to a building management system

2.8 PC software

2.8.1 Operation

2.8.2 Saving and sending programs

2.8.3 Trend data

2.8.5 Saving and printing screens and logs

2.8.6 USB type laptops

2.9 Optional current loop interfaces

2.9.1 Optional 4-20 mA DC outputs

2.9.2 4-20 mA DC connections

2.10 Connecting external alarms

2.10.1 Over v iew

2.10.2 Connection

3.0 Setup programming

3.1 Initial power up

3.2 Data display screen

3.3 Navigating to the 1st setup screen

3.4 Navigating to the 2nd setup screen

3.4.1 Location

3.4.2 Number of zones installed

3.4.3 Alarm acknowledge mode

3.4.4 Audible alarm

3.4.5 Zone hold

3.4.6 Detection limit

3.4.7 Loop mode

3.4.8 Loop2 factor

3.4.9 Re-zero mode

3.5 Navigating to the 3rd setup screen

3.5.1 Overview

3.5.2 Baud rate

3.5.3 Node address

3.5.4 Password

3.6 Additional service features

3.6.1 Service timeout

3.6.2 DET digipot

3.6.3 Node address

3.6.5 Password

3.6.7 IR digipot

3.7 Establishing the CO2 sensor baseline

4.0 General operation

4.1 Functional overview