CET ART Operation Manual

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Operation Manual

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ART Infrared Refrigerant Transmitter

Rev. 5 | 2018.03

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ART - Operation Manual Rev. 5 | 2018.03

TABLE OF CONTENTS

1 POLICIES ..........................................................................................................5

1.1 Important Note ................................................................................................5

1.2 Warranty Policy ................................................................................................6

1.3 Service Policy ...................................................................................................6

1.4 Copyrights ........................................................................................................7

1.5 Disclaimer ........................................................................................................7

1.6 Revisions ..........................................................................................................8

2 INTRODUCTION .............................................................................................9

2.1 General Description ..........................................................................................9

2.2 Key Features .....................................................................................................9

3 INSTRUMENT SPECIFICATIONS .................................................................10

3.1 Technical Speci cations ..................................................................................10

3.2 Enclosure Dimensions ....................................................................................13

4 SENSOR SPECIFICATIONS ...........................................................................14

4.1 List of Available Internal Refrigerant Gases ....................................................14

4.2 Special Considerations for Infrared Sensors ....................................................15

4.3 Changing Gas Types and Accuracy ..................................................................16

5 FEATURES ......................................................................................................18

5.1 Front Exterior Enclosure .................................................................................18

5.2 Interior System Layout ...................................................................................20

5.2.1 Front of the Enclosure ..................................................................................... 20

5.2.2 Back of the Enclosure ......................................................................................21

6 MOUNTING / INSTALLING ..........................................................................22

6.1 Warnings and Prerequisites ............................................................................22

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6.2 Mounting Locations .......................................................................................23

6.2.1 General Placement Guidelines ........................................................................ 23

6.2.2 Machinery Rooms ........................................................................................... 23

6.2.3 Refrigerated Spaces.........................................................................................24

6.2.4 Chillers ............................................................................................................ 25

6.3 Mounting Procedure ......................................................................................25

7 WIRING AND CONFIGURATION .................................................................28

7.1 Overview ........................................................................................................28

7.2 Wiring Supply Power (24 VAC or 24 VDC) ........................................................29

7.2.1 Maintaining Neutral Polarity ........................................................................... 30

7.3 Wiring Alarm Output (Analog Signal) .............................................................31

7.4 Wiring Digital Alarm Output Relay .................................................................32

7.5 Connecting to a Controller..............................................................................33

7.6 Modbus Network Con guration .....................................................................33

7.7 Conclusion .....................................................................................................35

8 OPERATION AND STABILIZATION .............................................................36

8.1 Power Up and Warm-up .................................................................................36

8.2 Stabilization ...................................................................................................36

8.3 Perform a Manual Zero ...................................................................................36

8.4 Behavior During Alarm Conditions .................................................................37

8.5 Gas Detector Faults ........................................................................................37

8.5.1 Overview ......................................................................................................... 37

8.5.2 Non-Critical Faults ........................................................................................... 37

8.5.3 Critical Faults ................................................................................................... 38

9 CONFIGURING / SETTING THE PARAMETERS ..........................................39

9.1 User Interface Overview .................................................................................39

9.2 Setting Parameters ........................................................................................40

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9.2.1 Overview ......................................................................................................... 40

9.2.2 Con guring Parameters ..................................................................................40

9.3 Completing Setup ..........................................................................................49

10 FUNCTIONAL TESTS AND GAS ADJUSTMENTS ....................................50

10.1 Warnings and Cautions ................................................................................50

10.2 Bump Test vs Adjusting Detector Response ..................................................51

10.3 Bump Testing ...............................................................................................52

10.4 Adjustment Using Calibration Gas ................................................................54

11 MODBUS COMMUNICATIONS .................................................................56

11.1 Introduction .................................................................................................56

11.2 Communication Settings ..............................................................................56

11.3 Analog Input Registers .................................................................................57

11.4 Analog Output Registers ..............................................................................58

11.5 Input Status Flags ........................................................................................59

11.6 Output Status Flags ......................................................................................60

12 REPLACEMENT PARTS AND ACCESSORIES ...........................................60

12.1 Calibration Kit ..............................................................................................60

12.2 Metal Protective Guard ................................................................................61

12.3 Splash Cover .................................................................................................62

12.3.1 Splash Cover Mounting ................................................................................. 62

13 TROUBLE SHOOTING ................................................................................64

13.1 Fault Codes ...................................................................................................64

13.2 Diagnostic Attributes (P.-18) ........................................................................66

13.3 Resetting to Default Values ..........................................................................68

13.4 Other Symptoms ..........................................................................................69

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1 POLICIES

1.1 Important Note

Read and understand this manual prior to using this instrument. Carefully read the warranty policy, service policy, notices, disclaimers and revisions on the following pages.

This product must be installed by a quali ed electrician or factory trained technician and according to instructions indicated in this manual. This instrument should be inspected and calibrated regularly by a quali ed and trained technician. For more information, refer to Section 10 Functional Tests and Gas Adjustments of this manual.

This instrument has not been designed to be intrinsically safe. For your safety, do not use it in classi ed hazardous areas (explosion-rated environments).

INSTRUMENT SERIAL NUMBER:

______________________________________________________

PURCHASE DATE:

______________________________________________________

PURCHASED FROM:

______________________________________________________

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1.2 Warranty Policy

Critical Environment Technologies Canada Inc. (CETCI), also referred to as the manufacturer, warrants this instrument, (excluding sensors, battery packs, batteries, pumps and  lters) to be free from defects in materials and workmanship for a period of two years from the date of purchase

from our facility. The sensors have a warranty period of one year on a pro-rated basis from the date of purchase from our facility. If the product should become defective within this

warranty period, we will repair or replace it at our discretion.

The warranty status may be a ected if the instrument has not been used and maintained per the instructions in this manual or has been abused, damaged, or modi ed in any way. This instrument is only to be used for purposes stated herein. The manufacturer is not liable for auxiliary interfaced equipment or consequential damage.

Due to ongoing research, development, and product testing, the manufacturer reserves the right to change speci cations without notice. The information contained herein is based on data considered accurate. However, no warranty is expressed or implied regarding the accuracy of this data.

All goods must be shipped to the manufacturer by prepaid freight. All returned goods must be pre-authorized by obtaining a Returned Merchandise Authorization (RMA) number. Contact the manufacturer for a number and procedures required for product transport.

1.3 Service Policy

CETCI maintains an instrument service facility at the factory. Some CETCI distributors / agents may also have repair facilities; however, CETCI assumes no liability for service performed by anyone other than CETCI personnel.

Repairs are warranted for 90 days after date of shipment (sensors have individual warranties).

Should your instrument require non-warranty repair, you may contact the distributor from whom it

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was purchased or you may contact CETCI directly.

Prior to shipping equipment to CETCI, contact our o ce for an RMA #. All returned goods must be accompanied with an RMA number.

If CETCI is to do the repair work, you may send the instrument, prepaid, to:

Attention: Service Department Critical Environment Technologies Canada Inc. Unit 145, 7391 Vantage Way Delta, BC, V4G 1M3

Always include your Returned Merchandise Authorization (RMA) number, address, telephone number, contact name, shipping / billing information, and a description of the defect as you perceive it. You will be contacted with a cost estimate for expected repairs, prior to the performance of any service work.

For liability reasons, CETCI has a policy of performing all needed repairs to restore the instrument to full operating condition.

Pack the equipment well (in its original packing if possible), as we cannot be held responsible for any damage incurred during shipping to our facility.

1.4 Copyrights

This manual is subject to copyright protection; all rights are reserved. Under international and domestic copyright laws, this manual may not be copied or translated, in whole or in part, in any manner or format, without the written permission of CETCI.

1.5 Disclaimer

Under no circumstances will CETCI be liable for any claims, losses or damages resulting from or

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arising out of the repair or modi cation of this equipment by a party other than CETCI service technicians, or by operation or use of the equipment other than in accordance with the printed instructions contained within this manual or if the equipment has been improperly maintained or subjected to neglect or accident. Any of the foregoing will void the warranty.

Under most local electrical codes, low voltage wires cannot be run within the same conduit as line voltage wires. It is CETCI policy that all wiring of our products meet this requirement.

It is CETCI policy that all wiring be within properly grounded (earth or safety) conduit.

1.6 Revisions

This manual was written and published by CETCI. The manufacturer makes no warranty or representation, expressed or implied including any warranty of merchantability or  tness for purpose, with respect to this manual.

All information contained in this manual is believed to be true and accurate at the time of printing. However, as part of its continuing e orts to improve its products and their documentation, the manufacturer reserves the right to make changes at any time without notice. Revised copies of this manual can be obtained by contacting CETCI or visiting www.critical-environment.com.

Should you detect any error or omission in this manual, please contact CETCI at the following address:

Critical Environment Technologies Canada Inc.

Unit 145, 7391 Vantage Way, Delta, BC, V4G 1M3, Canada Toll Free: +1.877.940.8741 Telephone: +1.604.940.8741 Fax: +1.604.940.8745

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Email: marketing@cetci.com Website: www.critical-environment.com

In no event will CETCI, its o cers or employees be liable for any direct, special, incidental or

consequential damages resulting from any defect in any manual, even if advised of the possibility of such damages.

2 INTRODUCTION

2.1 General Description

Thank you for purchasing our ART Infrared Refrigerant Transmitter. The ART is a single channel, non-dispersive infrared,  xed gas detector which can detect a wide range of refrigerant gases.

The fast-responding sensor accurately detects refrigerant gas leaks without cross-interference from combustible or toxic gases. It can be used on a stand-alone basis, connected to a controller or integrated into a Building Management System (BMS).

If after reading through the manual, you have any questions, please do not hesitate to contact our service department for technical support.

2.2 Key Features

• Long-life, non-dispersive infrared refrigerant sensor allows for accurate low-level leak detection with no cross-interference from other non-refrigerant gases

• Detects all refrigerants (CFC, HCFs, HCFC, HFOs) including HF01234YF, HFO1234Ze, HFO1233ZD, R410a, R22, R32, and more

• Use as a standalone system or integrate into a larger system

• Modbus® RTU interface to connect to a BAS/BMS/DDC

• User selectable, Modbus® or analog output 4-20 mA, 0-5V, 1-5V, 0-10V, 2-10V

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• On-board alarm relay

• LED real-time display with on-board audible and visual alarms

3 INSTRUMENT SPECIFICATIONS

3.1 Technical Speci cations

GAS TYPE

Refrigerants R22, R32, R123, R134a, R404a, R407a, R407c, R407f. R410a, R422a, R422d, R427a, R448a,

R449a, R452a, R507, R513a, R514a, HFO1233ZD, HFO1234YF, HFO1234Ze,

MECHANICAL

Enclosure ABS plastic with a UL  ammability rating of 94V-0

Weight 180 g / 0.40 lb / 6.3 oz

Size 4.0” x 5.5” x 1.5” / 102 mm x 140 mm x 37 mm

ELECTRICAL

Power Requirement

24 VDC @ 0.5 A min 24 VAC, 5 VA min @ 50 - 60 Hz, 2.5 W max

Wiring

24VAC or 24VDC two-conductor shielded 14 to 22 AWG stranded within conduit

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INPUT / OUTPUT

Analog Outputs 4-20 mA, 0-5V, 0-10 V, 1-5V, 2-10V

Modbus RTU over RS-485

Baud rate: Start bits: Data bits: Parity: Stop bits: Re-entry time: End of msg:

9,600 or 19,200 (selectable) 1 8 none, odd, even (programmable) 1 or 2 (programmable) 500 ms (min time between retries) silent 3.5 characters

Relays One relay rated 1 A @ 24 VAC/VDC (0.5A, 125V AC UL rating)

SENSOR

Type Infrared

Range 0 - 3,500 ppm

Squelch

Readings below 75 ppm are squelched by default. Meaning, when

 ltering is disabled (see Parameter P.-19 on page 48), the unit will respond to concentrations sub -10 ppm.

Response Time, T

< 5 minutes

USER INTERFACE

Display

Green LED Power ON indicator and bright, alpha-numeric LED realtime display

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Audible Alarm

Buzzer; enable/disable

Visual Alarm Red 4-digit LED display

Alarm Delay Selectable; 0 to 15 minutes

Fault Monitoring Fault codes presented to user

ENVIRONMENTAL

Operating Temperature

-30°C to 40°C (-22°F to 104°F)

Operating Humidity 5 - 90% RH non-condensing

CERTIFICATIONS

Conforms to CE / UL / CSA / IEC / EN 61010-1

IP Rating

Not IP rated. An accessory splash guard is available for areas requiring additional protection from wash down.

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3.2 Enclosure Dimensions

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4 SENSOR SPECIFICATIONS

4.1 List of Available Internal Refrigerant Gases

The ART is shipped factory certi ed and calibrated to the target refrigerant. For more information on Parameter 11 and refrigerant con guration instructions, see Section 9 Setting and Con guring the Parameters.

Part Number Refrigerant Range Accuracy Lifespan

ART-B-R22 R22 0 - 3,500 ppm ±5% 7-10 yrs

ART-B-R32

R32 0 - 3,500 ppm ±5% 7-10 yrs

ART-B-123 R123 0 - 3,500 ppm ±5% 7-10 yrs

ART-B-R134A R134a 0 - 3,500 ppm

±5% 7-10 yrs

ART-B-R404A R404a 0 - 3,500 ppm

±5% 7-10 yrs

ART-B-R407A R407a 0 - 3,500 ppm

±3% 7-10 yrs

ART-B-R407C R407c 0 - 3,500 ppm

±3% 7-10 yrs

ART-B-R407F R407f 0 - 3,500 ppm

±3% 7-10 yrs

ART-B-R410A R410a 0 - 3,500 ppm

±3% 7-10 yrs

ART-B-R422A R422a 0 - 3,500 ppm

±5% 7-10 yrs

ART-B-R422D R422d 0 - 3,500 ppm

±5% 7-10 yrs

ART-B-R427A R427a

0 - 3,500 ppm ±3% 7-10 yrs

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ART-B-R448A

R448a 0 - 3,500 ppm ±5% 7-10 yrs

ART-B-R449A

R449a 0 - 3,500 ppm ±5% 7-10 yrs

ART-B-R452A R452a 0 - 3,500 ppm ±5% 7-10 yrs

ART-B-R507 R507

0 - 3,500 ppm ±5% 7-10 yrs

ART-B-R513A

R513a 0 - 3,500 ppm ±5% 7-10 yrs

ART-B-R514A

R514a 0 - 3,500 ppm ±5% 7-10 yrs

ART-B-HFO1234YF

HFO1234YF 0 - 3,500 ppm ±5% 7-10 yrs

ART-B-HFO1234ZE

HFO1234ZE 0 - 3,500 ppm ±5% 7-10 yrs

ART-B-HFO1233ZD

HFO1233ZD 0 - 3,500 ppm ±5% 7-10 yrs

4.2 Special Considerations for Infrared Sensors

Using infrared sensor technology will ensure the highest degree of sensor accuracy if monitoring an area where there are other contamination gases or multiple refrigerants in the same area.

Infrared refrigerant sensors should not be used in locations that have corrosive chemicals such as chlorine, ammonia and other oxidizers that are present, especially if there is a higher humidity level. High humidity environments can e ect response and promote corrosion.

Typically requires 10 to 20 minutes to equalize after a sudden variation in temperature. May take up to 30 minutes to stabilize from a sudden change in humidity.

Water or vapour condensation in wet environments may impair the optics ability to function.

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Installing the splash cover is recommended in wet environments where spray downs occur.

Dusty/dirty environments can coat the optics and impair the sensor response. A regular maintnance schedule that includes cleaning the optics may be necessary.

No minimum level of oxygen is required; operates in the absence of, or enriched presence of oxygen.

The ART can be re-calibrated in the  eld to new target gases. Use optional calibration instructions in Section 10 Functional Tests and Gas Adjustments for increased accuracy when detecting a new target gas that is di erent from the “as shipped” target gas.

4.3 Changing Gas Types and Accuracy

As Shipped

The ART-R22 is factory calibrated to R22 and has an AS-SHIPPED R22 response accuracy of ±5% of reading.

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Changed Gas Type

(Reduced Accuracy)

The gas detector may be changed to respond to any of the other listed refrigerants (see Parameter P.-11 in Section 9.2 Setting Parameters). If changed, the gas detector will have a lower accuracy for the target refrigerant (without calibration). In this

example, that accuracy is ±16% of reading.

Optional Calibration

(For Improved Accuracy)

By applying calibration gas containing the NEW target refrigerant, and via the routine described in Section 10.4 Adjustment Using Calibration Gas, the gas detector may then be adjusted to respond with the calibrated accuracy of ±5% of reading as shown in the chart in Section 4.1.

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5 FEATURES

5.1 Front Exterior Enclosure

•

‘

“

’

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NUMBER FEATURE FUNCTION

Power LED Green LED, indicates unit power is ON.

•

4-digit LED Display

Alpha-numeric display (to show concentration in real-time)

Information Button

Used to access the parameter list. Used to back up one level without writing to memory when the parameter list is active. Used to mute the audible alarm for the time period con gured in parameter

P.-12.

•

Up Button Used to increment the value or parameter displayed.

•

Down Button

Used to decrement the value or parameter displayed. (When the Up Button and Down Button are pressed and held together for 5 seconds, this key combination manually zeroes the gas detector.)

‘

Enter/Select Button Saves the currently displayed parameter to memory.

’

Cable Glands (2 places)

Pre-installed cable gland is on the left. The optional cable gland is on the right (if installed). See Section 7 Wiring and Con guration.

“

Test Gas Port Used to connect the regulator during testing.

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5.2 Interior System Layout

5.2.1 Front of the Enclosure

NUMBER FEATURE FUNCTION

IR Bench Location of the Infrared sensor.

•

Relay

Pluggable terminal for relay connection.

•

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Modbus end of line jumper

Critical for good communication.

•

Audible alarm

Default setting is enabled.

5.2.2 Back of the Enclosure

•

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NUMBER FEATURE FUNCTION

Junction box mounting holes

Use hole pattern to mark the mounting locations as needed and attach ART base to junction box using mounting hardware through these holes.

•

Terminal Block Positions 1-6

AC, DC and Analog wiring

Cable Gland / Blanking Plug

Pre-installed cable gland is on the left. The optional cable gland is on the right, if installed (each with a 1/4 inch cable capacity). See Section 7 Wiring and Con guration.

•

Flat surface mounting holes

Use to attach ART base to wall mount or other  at surface using #6 screws provided.

•

Terminal Block Positions 7-12

Relay (alarm) output wiring and Modbus network connection wiring

6 MOUNTING / INSTALLING

6.1 Warnings and Prerequisites

WARNING: Explosion hazard. DO NOT mount the ART in an area that may contain  ammable liquids, vapors, or aerosols. Operation of any electrical equipment in such an environment constitutes a safety hazard.

CAUTION:

• The ART contains sensitive electronic components that can easily be damaged. DO NOT touch or disturb any of these components.

• DO NOT mount the ART directly to vibrating machinery as the vibrations may degrade the gas

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detector’s performance.

NOTES:

• The mounting location of the monitor should allow it to be easily accessible for visual monitoring and servicing.

• The monitor must be connected to a marked, suitably located and easily reached switch or circuit-breaker as means of disconnection.

• Connect monitor power and signaling terminals using wiring that complies with local electrical codes or regulations for the intended application.

6.2 Mounting Locations

6.2.1 General Placement Guidelines

The ART should be installed plumb and level and securely fastened to a rigid mounting surface. Gas detectors must be located within the appropriate wire lengths from the central control unit (if used).

NOTE: When installed in areas that may be subjected to water spray, the optional splash guard should be used in conjunction with the ART.

6.2.2 Machinery Rooms

There is no absolute rule in determining the number of gas detectors and their locations. However, a number of simple guidelines will help to make a decision. Gas detectors monitor a point as opposed to an area. If the gas leak does not reach the detector then no alarm will be triggered. Therefore, it is extremely important to carefully select the gas detector location. Also consider ease of access for maintenance.

The size and nature of the site will help to decide which method is the most appropriate to use. Locations requiring the most protection in a machinery or plant room would be around

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compressors, pressurized storage vessels, refrigerant cylinders or storage rooms or pipelines. The most common leak sources are valves, gauges,  anges, joints (brazed or mechanical),  lling or

draining connections, etc.

In machinery rooms where there is little or no air ow, placement options are:

• Point Detection, where gas detectors are located as near as possible to the most likely sources of leakage, such as the compressor, expansion valves, mechanical joints or cable duct trenches.

• Perimeter Detection, where gas detectors completely surround the area or equipment.

• Halocarbon and hydrocarbon refrigerants are heavier-than-air gases and as such the gas detectors should be located near ground level (6 to 18 inches from the  oor).

NOTE: Gas detectors should be positioned just far enough back from any high-pressure parts to allow gas clouds to form and be detected. Otherwise, a gas leak might pass by in a high-speed jet and not be detected by the gas detector.

• Make sure that pits, stairwells and trenches are monitored since they may  ll with stagnant pockets of gas.

• For racks or chillers pre- tted with refrigerant gas detectors, these should be mounted so as to monitor the compressors.

• Do not mount the gas detector directly to pipes or structures that are subject to strong vibration.

6.2.3 Refrigerated Spaces

In refrigerated spaces, gas detectors should be located away from doors, in the return air ow to the evaporators on a sidewall (below head-high is preferred), or on the ceiling, not directly in front of an evaporator, nor in any direct air ow. In large rooms with multiple evaporators, gas detectors should be mounted on the central line between two adjacent evaporators, as turbulence will result in air ows mixing.

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6.2.4 Chillers

In the case of small water- or air-cooled enclosed chiller units mount the gas detector so as

to monitor air ow to the extract fans. With larger models also place a gas detector inside the enclosure under or adjacent to the compressors.

For enclosed air-cooled chillers or the outdoor unit for variable refrigerant volume and variable refrigerant  ow (VRV/VRF) systems, mount the gas detector so as to monitor air ow to the extract fan. With large units also place a gas detector inside the enclosure under or adjacent to the compressors.

6.3 Mounting Procedure

To open the housing as received, use a  at blade screwdriver and depress the top latch. While pushing the latch grasp the back edge of the housing near the latch and pull the back away.

When mounted, the housing is simply opened by pressing the top latch with a suitable screwdriver or other  at blade. With the top latch depressed pull the housing apart by grasping the sides and pulling straight out. With the housing separated the mounting base with terminal blocks will be visible.

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NOTE: Do not apply caulking or other material around the gas detector base. The gas detector relies on air exchange through the spaces between the base and the gas detector housing. Do not obstruct the small gap around the housing and the base with any material.

Step 1: Open the housing.

Step 2: Position the base to the pre-determined (acceptable) mounting location. Use the gas detector base to mark the mounting location as needed. The hole pattern on the back plate is sized to mount the gas detector onto various electrical junction boxes. The other holes may be used as needed to mount the gas detector to other structures, or onto a wall.

Step 3: Wall Mount (if doing a junction box mount, go to Step 4)

Attach the ART base to the mounting surface using two #6 screws (provided) through two of the 6

 at surface mounting holes, being careful not to over-tighten the screws.

Step 4: Junction Box Mount (if doing a wall mount, see Step 3) Attach the ART base to the junction box (using mounting hardware provided with your junction box) through the two junction box holes. See diagram above.

Step 5: Unless you are ready to wire the device (see Section 7 Wiring and Con guration) carefully snap the cover onto the base unit.

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7 WIRING AND CONFIGURATION

7.1 Overview

Prior to wiring and con guring the ART, assure the following conditions have been met:

• ART back plate is mounted in an appropriate location

• The cover panel is removed.

If the cover panel was reattached after mounting, open the gas detector enclosure by pressing the top latch with a suitable screwdriver or other  at blade. With the top latch depressed pull the

housing apart by grasping the sides and pulling straight out. Align and press together to close.

NOTES:

• The pre-installed cable gland (left) and optional cable gland (right) have a 1/4 inch cable capacity (each).

• Install the optional cable gland on the right side of the base unit if needed. Otherwise, install the blanking plug that is included in the mounting kit.

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7.2 Wiring Supply Power (24 VAC or 24 VDC)

WARNING: Incorrect wiring may permanently damage the gas detector, and void the warranty. Double check all terminations before applying power.

All wiring should be run within properly grounded (earth or safety) conduit. Low voltage wiring must not be within the same conduit as line voltage wiring.

Either 24 VAC or 24 VDC may be used to power the ART. Connect wiring to the appropriate terminal locations. Use 2 wires between 14 and 22 AWG.

POWER OPTION PIN LABEL WIRING TERMINATION

24 VAC

1 L 24V AC line

2 N 24V AC neutral

24 VDC

3 + 24V DC positive

4 GND 24V DC ground

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The ART must be powered by either:

• A suitable UL 60950/CSA certi ed power supply that is isolated from line voltage by double

insulation, or

• An appropriately rated UL listed/CSA Class 2 transformer.

Failure to comply can result in personal injury or death.

7.2.1 Maintaining Neutral Polarity

Neutral polarity must be maintained across units.

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7.3 Wiring Alarm Output (Analog Signal)

The ART provides an analog output signal that is proportional to the level of gas detected.

NOTE: No jumpers or hardware switch settings are required to con gure the analog output. This is done electronically from the front panel display.

Connect two 18 to 20 AWG wires to terminal block positions 5 and 6, noting ground and signal polarity shown in Section 7.2.1 Maintaining Neutral Polarity.

FUNCTION PIN WIRING TERMINATION

Analog Output

5 Analog output ground

6 Analog output signal (+)

The type of output signal on pins 5 and 6 is programmable using the analog output type parameter P.-03. Refer to Section 9 Con guring / Setting the Parameters for details.

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7.4 Wiring Digital Alarm Output Relay

An alarm setpoint may be programmed from the front panel of the ART. When the sensed gas level exceeds the alarm setpoint, the ART enters the alarm state. An on-board relay is tied to the alarm state, so you may activate (or deactivate) external equipment based on the ART’s current alarm status.

NOTE: The relay can be programed to be failsafe (normally energized). By default, the relay is set to be normally de-energized. This can be set using parameter P-06.

Make relay connections (NO, NC, or both) using 18 to 20 AWG wires to terminal block positions 10, 11, and 12, noting normally open, normally closed, and common connectors.

FUNCTION PIN WIRING TERMINATION

Relay (Alarm)

Output

10 Relay NC contact

11 Relay common contact

12 Relay NO contact

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7.5 Connection to a Controller

The ART can connect to any Controller through the standard analog output (voltage and current: see 4.1 Technical Speci cations), the standard alarm relay, or the digital Modbus RTU communications interface.

7.6 Modbus Network Con guration

If your application includes a Modbus network, make network connections (RS-485 A and RS-485 B) using 18 to 24 AWG shielded twisted pair wires (with 120 ohm characteristic impedance) to terminal block positions 7 and 8, noting inverted B (-) and non-inverted A (+) signal connectors.

FUNCTION PIN WIRING TERMINATION

Modbus Network

Communications

7 RS-485 “B” (inverted)

8 RS-485 “A” (non-inverted)

9 RS-485 shield

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NOTE: For Modbus network communications wiring, use only 18 to 24 AWG shielded twisted pair wire with 120 ohm characteristic impedance.

Connect the RS-485 cable shield pin 0 (board ground).

Selection of the Modbus Address and Baud Rate is completed through the gas detector setup menu, described later. No jumpers or hardware switch settings are required to con gure the Modbus

communications network. This is done electronically from the front panel display.

For Modbus communications with the ART, the default communications parameters are as follows:

• Baud rate = 9,600

• Parity = no parity

• Stop bits = 1

Con rm that all devices on the Modbus communications network (including a Building Management System) are con gured similarly.

If the ART is at the end of the RS-485 network, then be sure to set the RS-485 terminator on the printed circuit board (PCB) to IN. This applies a terminating resistor to the end of the wires per the requirements of the RS-485 protocol. The terminator should be set to OUT for all other installation conditions.

Be sure to enable the termination resistor on the device at each end of the network. This includes the Building Management System (if used).

NOTE: Care should be exercised when changing the terminator switch. Before powering the gas detector, use a  ne pointed device or paper clip to slide the switch position. Do not apply force to the switch or push on the switch with any device. The switch changes position up and down along the access slot direction.

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7.7 Conclusion

Once the base is mounted and all wiring is complete, align the gas detector housing and press it onto the base. The gas detector will snap into position, completing all electrical connections. Ensure the top and bottom snap locks are engaged.

NOTES:

• If the right cable gland was not needed during installation and wiring, be sure to install the blanking plug.

• Do not apply caulking or other material around the gas detector base. The gas detector relies on air exchange through the spaces between the base and the gas detector housing. Do not obstruct the small gap around the housing and the base with any material.

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8 OPERATION AND STABILIZATION

8.1 Power Up and Warm-up

On powering up, the ART will sense for the presence of gas after an initial warm-up period of 2 to 5 minutes. The green LED will  ash at a 1 second interval during the warm-up.

8.2 Stabilization

It is vital when  rst installing the gas detector that it warms up in an atmosphere that is known not to contain any background concentrations of refrigerant.

8.3 Perform a Manual Zero

After the gas detector stabilizes, the power LED stops  ashing and is lit continuously. CETCI recommends manually zeroing the ART after a 1-hour stabilization period. Increase this stabilization period to 3 hours for freezer applications.

To manually zero the gas detector, press and hold the UP and DOWN buttons simultaneously for 5 seconds. The gas detector will beep and the display will show “ZERO” when zeroing is complete. The display will show FAIL if the temperature is changing too quickly or there is an active alarm condition. Additionally, certain system faults (F.-08, F.-10 through 14 and/or F.-16) will prevent a manual zero from being performed.

NOTES:

• Manual zero should be performed in the environment of operation and at the typical operating temperature.

• Subsequent manual zeroes may be performed, provided the atmosphere around the gas detector is free of all background concentrations of refrigerant. Clean air or nitrogen applied to the calibration port for  ve minutes may be used to ensure the gas detector is clear of all background gas. Re-zeroing with background refrigerant present will cause the gas detector to report incorrect readings.

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8.4 Behavior During Alarm Conditions

The following occurs during an alarm condition:

ITEM BEHAVIOUR DURING ALARM STATE

Green LED ON (solid)

Display

ON (blinks), reports detected ppm concentration

Audible Alarm

ON (if enabled and after programmed delay expires)

Relay Output

Activates (after any programmed delay expires)

Analog Output

Changes proportionally with gas concentration (as con gured)

Modbus Registers

Registers indicate the alarm condition, ppm concentration, etc.

NOTE: The alarm feature includes a 20% dead band to prevent alarm ‘chatter’ if the concentration hovers near the alarm set point. Once the alarm has been triggered it will remain latched until the concentration drops below 80% of the alarm setpoint.

8.5 Gas Detector Faults

8.5.1 Overview

There are two levels of faults monitoring built into the ART gas detector:

• Non-critical

• Critical

8.5.2 Non-Critical Faults

Non-critical faults typically recover by allowing the gas detector surroundings to stabilize, for example, after a defrost cycle. The gas detector continues to monitor its surroundings during non-

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critical faults, but may report inaccurate readings.

The following occurs when a non-critical fault condition exists:

ITEM BEHAVIOUR DURING ALARM STATE

Green LED ON (solid)

Display

Shows the appropriate fault code

Analog Output

Operates normally

Modbus Registers

Modbus registers indicate the fault

8.5.3 Critical Faults

Critical faults may indicate an unrecoverable condition. Please refer to Section 13 Trouble Shooting for more information. The following occurs when a critical fault condition exists:

ITEM BEHAVIOUR DURING ALARM STATE

Green LED OFF (indicating the gas detector is o -line)

Display

Shows the appropriate fault code

Analog Output

4 - 20 mA output Changes to 2 mA

1 - 5V output Changes to 0.5V

2 - 10V output Changes to 1.0V

Modbus Registers

Modbus registers indicate the fault

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9 CONFIGURING / SETTING THE PARAMETERS

9.1 User Interface Overview

The ART Gas Detector is con gured through the built-in menu system. Once mounting is complete, attach the gas detector to the base and apply power.

The user interface consists of four pushbuttons, a four digit LED numeric display, and a power LED. When the display is o , press any button to wake the display for 10 seconds.

Buttons functions:

BUTTON BEHAVIOR DURING ALARM STATE

Used to access the parameter list. Used to back up one level without writing to memory when the parameter list is active. Used to mute the audible alarm for the time period con gured in parameter P.-12.

Used to increment the value or parameter displayed.

Used to decrement the value or parameter displayed.

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When pressed together and held for 5 seconds, this key combination manually zeroes the gas detector.

Saves the currently displayed parameter to memory.

9.2 Setting Parameters

9.2.1 Overview

Press and hold the information button (i) for 5 seconds (the release) to activate the parameter list. Each parameter is shown in turn by using the UP or DOWN buttons. The parameter is shown as P.-XX, with XX being the parameter value. Pressing Enter while a parameter is displayed allows the attributes of the parameter to be set. Each Parameter has its own attributes, as shown in the table below. Set the attributes as desired, and then press Enter to save the setting.

9.2.2 Con guring Parameters

PARAMETER DESCRIPTION

Maintenance Mode

Sets gas detector to o ine mode for 30 minutes.

00 Gas detector is online, with normal response to its surroundings

(default)

01 Gas detector is o ine and suppresses all outputs. Display reads

“oFFL” (o ine) during 30 minute timeout.

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Alarm Set Point

Sets desired ppm value (range 75 to 3,500 ppm) above which alarm occurs. Use UP or DOWN buttons. For faster “coarse” adjustment, hold either button to sweep through the adjustment range quickly. Default set points are Low: 250 ppm, Med: 500 ppm and High: 1,000 ppm for all gases except R123 where the defaults are Low: 85 ppm, Med: 95 ppm and High: 100 ppm.

Analog Output Type

Selects output type:

00 Selects 0-5 V 01 Selects 1-5 V 02 Selects 0-10 V 03 Selects 2-10 V 04 Selects 4-20 mA (default)

Alarm ON Delays

Sets the ON delay time (0-15 minutes) for the alarm output signals (relay, Modbus). The default delay is 0 minutes.

Alarm OFF Delays

Sets the OFF delay time for the alarm output signals (relay, Modbus) in minutes (0-15). The default delay is 0 minutes.

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Relay Contact Behavior (Failsafe Mode)

Sets the default relay power state so that power loss can be detected. The behavior of the relay changes from energizing when an alarm condition occurs (default) to energizing at power up (Failsafe). In both cases the relay changes state when an alarm occurs, failsafe is simply inverted. This allows power failures to be detected as alarms.

00 NO 01 Failsafe mode (default mode)

Relay Latching

Controls the relay latching behavior.

00 OFF (default). Relay does not latch and resets once the alarm

condition is removed.

01 ON. Relay remains latched; reset by BMS command over RS-485

or by pressing and holding the ENTER button for 5 seconds.

Audible Alarm

The units have an internal audible alarm. You can disable this, but the default setting is “enabled” in compliance with EN378.

00 OFF 01 ON (default)

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Display Mode

The display can be turned on by using this parameter. When set to ON the display never shuts o (all operating modes). When ON the display shows

the current gas concentration (or 0 if below the squelch). Note that P.-09 is disabled if P.-19=0.

00 OFF during normal operation when the ppm value is below the

alarm set point

01 ON (default)

In either case, the display will blink the measured ppm value during an alarm state.

RS485 Node Address

Sets the RS-485 node address (0001 to 0255).

Gas Selection

Select from 3 groups of gases or the actual refrigerant name is shown. Select the appropriate refrigerant.

NOTE: The ART gas detector is factory calibrated to a single refrigerant using specialized manufacturing equipment. If another refrigerant is selected which di ers from the factory calibrated setting, the built in calibration no longer applies. Further improvement in detector accuracy may be gained by applying calibration gas containing the newly selected refrigerant and adjusting the gas detector reading to match (see Parameter P.-17).

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Buzzer Mute Time

Sets a time (0-59 minutes) during which the active buzzer remains muted:

- after the “I” button is pressed, or

- after Modbus register 4000 is set to 0

Baud Band

Sets the baud rate for Modbus (RS-485) communications.

00 9,600 baud (default) 01 19,200 baud

Stop Bits

Sets the number of stop bits required to match the controlling communications equipment (e.g., building management system, etc.).

01 1 stop bit (default) 02 2 stop bits

Parity

Sets Modbus parity option.

00 None (default) 01 Odd parity 02 Even parity

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Analog Output Scaling

Allows the user to select the full-scale ppm value that represents maximum analog output (e.g., 20 mA) for scaling the analog output. Adjustment range is from 100 to 3,500 ppm. Default = 3,500 ppm. (The setting cannot be adjusted above 3,500.)

Use the Up and DOWN buttons to set the desired full scale value. All outputs will be scaled to the indicated full scale value.

NOTES:

• Alarm values are not scaled, but are absolute values. Setting a smaller full scale does not correspondingly scale the alarm setting.

• When the ppm level is greater than the programmed analog output Full Scale ppm (P.-16), the analog output will go to a 10% over range state (indicating that the concentration is too high for the analog output to achieve). For example, for a 1-5 V setting the analog output would go to 5.5 V, for 4 20 mA it would go to 22 mA and so on.

The analog output signal range is from 100 ppm to the default value of 3,500 ppm, which is scaled across the actual output range selected by the analog output type parameter P.-03. The upper ppm limit is programmable using analog output scaling parameter P.-16. This parameter sets the full scale ppm value creating a ppm range across which the analog output is scaled.

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PARAMETER DESCRIPTION

Gas Test Mode

Places the gas detector in gas test mode.

00 Disabled (default) 01 Enabled

When enabled, the display continuously cycles through the following:

- CAL is displayed brie y.

- Next, the gas group number or gas type (based on product code) is displayed.

- Then four dashes (----) are displayed.

After gas is applied and the 75 ppm squelch level is exceeded, the live concentration replaces the four dashes. See Section 10.4 Adjustment Using Calibration Gas if using Gas Test Mode to initiate the calibration procedure.

NOTE: To prevent false alarms, all outputs are suspended while Test Mode is active. The only live indication is the 4-digit display. Once the gas test mode is enabled to perform a gas test or calibration, the unit will automatically go o ine for a ten minute period after the parameter

list is exited. (This allows time for the test gas to clear before the unit becomes active). If no activity occurs for ten minutes, the unit exits the gas test mode.

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Diagnostics Menu

Parameter 18 provides access to the self-diagnostic information. The LED display shows “DIAG” until the Enter button is pressed. Use the UP and DOWN buttons to scroll through the list of diagnostic attributes.

A.-01 Current fault condition A.-02 Last fault A.-03 Days in service A.-04 Days since last adjust/test A.-05-A.-07 Factory Use Only A.-08 Detector temperature in oC A.-09 Temperature rate of change A.-10-A.-17 Factory Use Only

To aid in trouble shooting, the operator may choose to reset the gas detector to its default state by holding both the UP and DOWN buttons for 5 seconds while in the Diagnostics Menu. All settings, including the alarm set point, gas adjustments, the selected gas curve, calibration data, the Modbus address, etc. revert to speci c default values after a reset.

IMPORTANT: Calibrations are lost after a reset. This returns the gas detector to an uncalibrated condition. See Parameter P.-17 for information on how to recalibrate the gas detector.

Refer to Section 13 Trouble Shooting for a complete list of codes and details on the reset option.

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Response Filtering

This parameter is used to turn  ltered output ON (01) or OFF (00).

The default setting is ON (01). The Modbus and analog output are  ltered so that responses below 75 ppm are squelched. If the display mode (P.-09) is set to ON (01) the display shows 0 for any signal level below 75 ppm.

Some installations may wish to monitor the small analog output changes that may be created by the detector environment. Turning  ltering OFF (00) allows these small variations around the minimum analog output (e.g., 4 mA, 1V, etc.) to be transmitted via Modbus and the analog output terminals.

NOTES:

• The detector display is OFF when  ltering is OFF (P.-09 is disabled).

• Whenever  ltering is OFF the detector display will turn ON for 10 minutes if the detector is re-zeroed (see Section 8.3 Perform Manual Zero). This is intended to aid maintenance testing. The analog outputs continue to transmit the full, un ltered range, and the alarm set point remains active.

9.3 Completing Setup

To complete the setup after all parameters are set as needed, simply press and hold the information button (i) for 5 seconds to exit the Parameter list. The gas detector is now actively monitoring its surroundings.

NOTE: If no buttons are pressed for 2 minutes, the ART exits setup mode automatically.

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10 FUNCTIONAL TESTS AND GAS ADJUSTMENTS

10.1 Warnings and Cautions

To comply with the requirements of EN378 and the European F-GAS regulation, gas detectors must be tested annually. However, local regulations may specify the nature and frequency of this test. Check local regulations on calibration or testing requirements.

The ART contains sensitive electronic components that can be easily damaged. Neither touch nor disturb any of these components.

CETCI recommends annual checks and adjustment using calibration gas. Calibration gas adjustment frequency may be extended based on application. In applications where life safety is critical, calibration gas adjustment should be done quarterly (every 3 months) or on a more frequent basis. CETCI is not responsible for setting safety practices and policies. Safe work procedures including calibration policies are best determined by company policy, industry standards, and local codes.

Failure to test or adjust the unit in accordance with applicable instructions and with industry guidelines may result in serious injury or death. The manufacturer is not liable for any loss, injury, or damage arising from improper testing, incorrect adjustment, or inappropriate use of the unit.

Before testing the gas detectors on-site, the ART must have been powered up and allowed to stabilize.

After initial installation, the ART should be gas tested to ensure proper operation.

The testing and/or adjustment of the unit must be carried out by a suitably quali ed technician, and must be done:

• In accordance with this manual

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• In compliance with locally applicable guidelines and regulations

Quali ed operators of the unit should be aware of the regulations and standards set down by the industry/country for the testing or calibration of this unit. This manual is only intended as a guide and, insofar as permitted by law, the manufacturer accepts no responsibility for the calibration, testing, or operation of this unit.

The frequency and nature of testing or calibration may be determined by local regulation or standards.

EN378 and the F-GAS Regulation require an annual check in accordance with the manufacturer’s recommendation.

10.2 Bump Test vs Adjusting Detector Response

There are two concepts that need to be di erentiated:

• Bump test

• Gas detector response adjustment

A bump test exposes the gas detector to a gas. The operator then observes the gas detector’s response to the gas. The objectives are two-fold:

• Establishes if the gas detector is reacting to the gas

• Determines if all of the detector outputs are working correctly

There are two types of bump tests:

• Quanti ed - A known concentration of gas is used.

• Non-quanti ed - A gas of unknown concentration is used (should not exceed two times the sensor range, preferable within the sensors range of 3,500 ppm).

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Adjusting gas detector response exposes the gas detector to a calibration gas as well (like a quanti ed bump test), but additionally sets the actual gas detector response level (via Parameter P.

17) to ensure that the gas detector activates at the speci ed gas concentration.

Refer to the Sections to follow for additional information on bump testing and gas detector response adjustment.

CAUTION: Before you carry out the test or adjustment:

• Advise occupants, plant operators, and supervisors.

• Check if the gas detector is connected to external systems such as sprinkler systems, plant shut down, external sirens and beacons, ventilation, etc. and disconnect as instructed by the customer.

• For bump test or calibration the ART should be powered up and fully stabilized as per Section 8 Operation and Stabilization.

10.3 Bump Testing

NOTE: Notify others that testing is underway. During bump testing the alarm outputs are active, and will trigger whatever response is intended. It is the operator’s responsibility to ensure that such actions are acceptable and can be performed safely.

After installation and parameter setup (see Section 9 Setting and Con guring the Parameters), the units should be bump tested. Expose the gas detector to test gas. The gas selected should be a high enough concentration to put the system into alarm and light the LED display.

With a bump test you can see the functions of the gas detector:

• The LED display will light and show the detected ppm concentration once the alarm set point is reached

• The relay and audible alarm will function as con gured including any delays set (ON or OFF).

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• The output (0 - 10 V, for example) will show the gas level

Ideally bump tests are conducted on-site in a clean air atmosphere.

Step 1: Remove the splash guard accessory if one is used.

Step 2: Connect the regulator to the test gas port using 3mm or 1/8” inside diameter tubing (see below).

Step 3: Expose the gas detector to gas from the cylinder. Monitor the LED display reading. Refer to Section

3.1 Technical Speci cations for acceptance criteria.

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10.4 Adjustment Using Calibration Gas

Every ART gas detector is calibrated in a chamber by true di usion method prior to leaving our facility. This method more closely emulates actual “real world” conditions. Field calibration using gas cylinder, regulator and hose directing span gas into the sensor may result in slightly higher readings. It is important to note that the type of gas mixture, how old the gas is and what

temperature it has been stored at will also a ect repeatability during  eld calibration.

Adjustment using calibration gas requires a gas cylinder with the appropriate gas and concentration. Note that CETCI o ers a calibration kit that consists of a calibration gas cylinder and a  ow regulation valve with  exible non-absorbent tubing.

If an inappropriate concentration of span gas is applied during calibration, calibration may succeed but it does not mean the equipment has been calibrated properly. CETCI is not responsible for improperly calibrated detectors. Follow manual instructions carefully.

NOTE: For improved accuracy and response, the gas detector should be protected from excess drafts while performing the adjustment. Excess air circulation may dilute the applied calibration gas and lead to lower than expected response.

Step 1: Connect the regulator to the test gas port using 3mm or 1/8” inside diameter tubing.

Step 2: Enable Parameter P.-17 Gas Test Mode (see Section 9 Setting and Con guring the Parameters). When enabled, the display continuously cycles through the following:

• CAL is displayed brie y.

• Next, the gas group number or gas type (based on product code) is displayed.

• Then four dashes (----) are displayed.

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After gas is applied and the 75 ppm squelch level is exceeded, the live concentration replaces the four dashes.

NOTE: The analog outputs, relay activity, and RS-485 ppm reporting are suspended in Gas Test Mode to prevent false alarms.

Step 3: Expose the gas detector to gas from the cylinder. Monitor the 4 digit LED display reading.

Step 4: Wait for the ppm reading to stabilize. This should take approximately 4-6 minutes. Minor changes (less than 5 ppm in 10 seconds) are considered stable readings. Compare the response value with the calibration gas concentration.

Step 5: Adjust the gas detector displayed value by using the UP or DOWN buttons to increase or decrease the value shown. Adjust until the reading is within ± 2% of the calibration gas. For example, if the

calibration gas is 1000 ppm, the gas detector is adjusted properly when the displayed reading is between 980 and 1,020 ppm.

Step 6: Press the Enter button to store the new adjustment. Turn o the calibration gas and remove the tubing from the calibration port.

Step 7: If no further changes to the other parameters are required, press and hold the (i) button for 5 seconds to exit the Parameter list. Upon exiting the Parameters list, the gas detector will enter o ine mode for a period of 10 minutes. This allows time for the calibration gas to dissipate after testing. During o ine mode, the gas detector suppresses all outputs. The display reads “oFFL”

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(o ine) during 10 minute timeout.

NOTE: All calibration gas mixtures have a blend tolerance. The tolerance will limit the actual adjustment accuracy that is achievable.

11 MODBUS COMMUNICATIONS

11.1 Introduction

The ART gas detector can be con gured to communicate on an RS-485 network using Modbus-RTU protocol. Before con guring the gas detector for Modbus communications, be sure your network connection is complete and your network termination switches are set appropriately. Refer to Section 7 Wiring and Con guration, for details.

This section details the ART parameters that can be accessed via registers of the Modbus-RTU (“Modbus”) protocol. Generally (with the exception of some of the communications parameters), parameters you can access and/or con gure from the front panel of the ART can also be accessed and/or con gured via a Building Management System (for example) on the same Modbus network.

11.2 Communication Settings

There are 255 selections available to be set electronically, from addresses 1 to 255 inclusive. Modbus data with a zero in the address  eld is received by all detectors (regardless of the address selected) to enable the master device to broadcast simultaneously to all the detectors.

Refer to Section 3.1 Technical Speci cations for information on RS-485 network communications parameters such as data bits, stop bits, etc.

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11.3 Analog Input Registers

Analog input registers are read only and use function code 04.

REG DESCRIPTION RANGE UNITS P.-##

1000 Concentration gas level 0-100 % FS - -

1001

Concentration gas level 0-65, 535 ppm - -

1002 Reserved - -

1003 Full scale detector level 0-65, 535 ppm - -

1004

Alarm set-point (% full scale) 0-100 % - -

1005

Gas detector timer 0-35, 535 hours - -

1006

Node address 1-247 none P.-10

1007

Software version none - -

1008

Reserved - -

1009

Reserved - -

1010

Reserved - -

1011

Reserved - -

1012

16-bit fault code 0-65535 none - -

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11.4 Analog Output Registers

Analog output registers are readable (using function code 03) and writable (using function code

06).

REG DESCRIPTION RANGE UNITS P.-##

2000 Alarm set point 75-3,500 ppm P.-02

2001

Alarm ON delay (Alarm  ag register 3000 is set to 1)

0-15 min P.-04

2002 Buzzer mute time 0-59 min P.-12

2003 Alarm OFF Delay 0-15 min P.-05

2004 Relay action

0=NO 1=Failsafe

none P.-06

2005 Relay latching enable

0=Disable 1=Enable

none P.-07

2006 Buzzer enable

0=Disable 1=Enable

none P.-08

2007 Display mode

0=OFF 1=ON

none P.-09

2008 Analog output type

0=0-5V 1=1-5V 2=0-10V 3=2-10V 4=4-20 mA

none P.-03

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2009 Baud rate

0=9,600 1=19,200

none P.-13

2010 Stop bits 1 or 2 none P.-14

2011 Gas curve number 1 to 4 or gas type none P.-11

2012 Analog output full scale ppm (R/O) 100-3,500 ppm P.-16

2013 Parity

0=None 1=Odd 2=Even

none P.-15

11.5 Input Status Flags

Input Status Flags are readable (using function code 02).

REG DESCRIPTION RANGE P.-##

3000 Alarm  ag (0 or 1=Alarm) 0-1 - -

3001 Relay state (0 or 1=energized) 0-1 - -

3002

Detector fault (0 or 1=fault) 0-1 - -

3003

Red LED state (0 or 1=ON) 0-1 - -

3004 Green LED state (0 or 1=powered ON) 0-1 - -

3005

Reserved - -

3006 Startup (0=normal operation, 1=warning) 0-1 - -

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3007 Reserved - -

3008

Reserved - -

11.6 Output Status Flags

Output Status Flags are readable (using function code 01) and writable (using function code 05).

REG DESCRIPTION RANGE P.-##

4000 Buzzer  ag (0 or 1=ON) 0-1 - -

4001

Test required (if operating for >1 year) (1=requires testing)

0=Okay 1=Test

- -

12 REPLACEMENT PARTS AND ACCESSORIES

NOTE: All modules come ready to mount to the original mounting base provided.

12.1 Calibration Kit (p/n: CET-715A-CK1)

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The Calibration Kit contains the items necessary for common  eld and shop calibration. It comes in a durable, hard plastic carrying case.

Gas cylinders are not included in the Kit. They must be ordered separately from the CETCI factory. Many gases are carried in inventory but not all. Check with any CETCI authorized distributor for availability of speci c gas types. Gas cylinders cannot be shipped from Canada to other

countries, including the USA.

12.2 Metal Protective Guard (p/n: SCS-8000-SPG)

The metal protective guard is heavy duty metal protective grate to help protect against abrasive damage, theft and vandalism to the transmitters. This is an added preventative on top of the product enclosure and the splash guard (if installed).

It is made from 16-gauge galvanized steel and has ½” (13 mm) square openings in the front to

allow gas and air to  ow through to the sensor. With only four slotted mounting holes, installation and removal for gas detector servicing is easy.

Enclosure 16 gauge galvanized steel

Weight 1.7 kg (3.8 lbs)

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Size 10.0” W x 9.5” H x 4.8” D (254 mm W x 241 mm H x 121 mm D)

12.3 Splash Cover (p/n: S)

CETCI recommends using the splash cover to protect the ART in when used in wet environments or where spray or wash-down of equipment is a common occurrence such as meat processing rooms, food and beverage facilities or chiller rooms.

Each splash cover comes with standard mounting hardware, instruction sheet and a mounting template. The unit can be used on existing installations. The clear poly carbonate housing allows for alarms to be seen through the front window. Slots along the side and bottom allow for gas to  ow

into and out of the sensor, while protecting the instruments from water damage.

12.3.1 Splash Cover Mounting

The splash cover uses key-hole mounting slots designed for #6 pan head fasteners that are provided with the splash cover. Allow the screw heads to protrude approximately 1/8 inch (3 mm).

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13 TROUBLE SHOOTING

13.1 Fault Codes

To comply with the requirements of EN378 and the European F-GAS regulation, gas detectors must be tested annually. However, local regulations may specify the nature and frequency of this test.

The ART features sophisticated internal status monitoring and will indicate whether a fault condition exists, both on the front display (F.-XX, with XX being the fault number) and over the Modbus communications network.

There are two classes of fault conditions: critical and non-critical. In general, non-critical faults occur…

…when environmental conditions exist that are outside the product’s speci ed operating range, or if an installation error has occurred (wrong wiring, for example).

The gas detector will typically continue to monitor its surroundings (except for fault F.-08), and may report inaccurate readings and false alarms.

Correcting non-critical faults is a matter of waiting for the environmental conditions to return to a more typical condition, correcting wiring mistakes, or in some cases, relocating the gas detector. For example, placing the gas detector near a forced air heater may cause temperature faults. The non-critical fault range is F.-01 to F.-08. Critical faults indicate…

…a functional problem that results in the gas detector no longer monitoring its surroundings for refrigerant.

The fault number is displayed and the power LED is turned o , indicating that the gas detector is

o ine. The critical fault range is F.-09 to F.-16. If any of these faults occur,  rst try to clear the faults by cycling power to the sensor. The easiest way to do this is by removing the sensor from the base

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and reattaching. If the fault returns after cycling power, the gas detector should be removed from service and replaced.

Additionally, the faults are stored as a hex code number and can be accessed in the Diagnostics menu P.-18. Refer to Diagnostics Attributes P.-18 in Section 13.2 Trouble Shooting for additional information.

DESCRIPTION FAULT CODE

HEX CODE

POSSIBLE CAUSES

Gas Detector Temperature Fault

0x0001

Gas Detector temperature reports

> 55° C or < -35° C.

Gas Detector Temperature Rate of Change Fault

0x0002

Temperature rate of change exceeds ~1°C/min for more than 15 minutes.

RS485 RX Fault 0x0004 Message too long for receive bu er.

RS485 CRC Fault

0x0008

Transmission is corrupted (computed CRC doesn’t match transmitted CRC).

Open Loop Fault

0x0010

Possible wiring, connection, and/ or termination issue exists. When analog output type is 4 20ma and loop is open, use 18-24 AWG shielded twisted pair with 120 ohm characteristic impedance for Modbus connections.

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Modbus Fault 0x0020

Modbus message was truncated or timed out early.

PPM Over-range Fault

0x0040

ppm exceeds 9,999. This may indicate a very large gross leak. If no leak is present, it indicates a gas detector error.

Input Voltage Fault

0x0080

Input supply power to the ART is out of range (i.e., 24V ±20%).

IMPORTANT: If this fault is active, the gas detector is o ine and not

monitoring. Correct the input supply voltage to restore normal operation.

Critical Faults

Critical fault. Cycle power to the sensor and see of the fault clears. If not, contact CETCI for help.

NOTE: Fault F.-15 may be caused by rapid changes in temperature and other environmental e ects.

If the F.-15 fault remains after the ambient temperature has stabilized, perform a manual re-zero to clear the fault. Refer to Section 8.3 Perform a Manual Zero for more information.

13.2 Diagnostic Attributes (P.-18)

Use this option to review the built-in diagnostic attributes. Access the parameter list (see Section 9 Setting and Con guring the Parameters) and select P.-18. Press the Enter button to access the diagnostics, and then use the UP or DOWN button to select each attribute. The following

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information is available.

ATTRIBUTE DESCRIPTION

Displays the current fault condition code in hex format: 0000 = no faults are active XXXX = HEX number See Section 13.1 Fault Codes for the HEX format cross reference.

Displays a hex format code that corresponds to any faults that occurred since the internal fault record was last erased. See Section

13.1 Fault Codes for the HEX format cross reference. The records may be erased by pressing the ENTER button.

Displays the number of days that the ART has been in service. The value of this attribute rolls over after 9999.

Displays the elapsed time (in days) from the last gas adjustment or test. This value is automatically reset to 0000 after completing a gas adjustment via Test Mode P.-17. (Note that the new adjustment is stored using the Enter button.) The value may be reset to 0000 by pressing the ENTER button.

Reserved

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Displays the sensor temperature in °C.

Displays the sensor’s approximate rate of temperature change per half minute interval (°C change over 30 seconds).

Reserved

13.3 Resetting the ART to Default Values

The gas detector may be reset to its default state, if needed, to aid in trouble shooting. All settings, including alarm setpoint, gas adjustments, selected gas curve, calibration data, Modbus address,

etc. revert to speci c default values after a reset.

NOTE: Resetting to default values returns the gas detector to an uncalibrated condition. See Parameter P.-17 for information on how to recalibrate the gas detector.

Before performing this operation it is advisable to write down all the parameter settings, so they can be re-programmed.

Step 1: Access diagnostics menu P.-18.

Step 2: Press and hold both the UP and DOWN buttons for 5 seconds. This will cause the following to occur:

• All the LED segments will then light for 3 seconds

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• The gas detector resets to the default settings

• The gas detector beeper sounds for 3 seconds.

Step 3: After 3 seconds the user is returned to the Parameter List at parameter P.-18.

Step 4: The gas detector may now be re-programmed for further trouble shooting if needed.

13.4 Other Symptoms

Other common wiring problems can also cause the gas detector to malfunction. Check below for additional conditions that will cause gas detector issues.

SYMPTOM POSSIBLE CAUSE(S)

Green power LED o Check power supply. Check wiring.

Alarms in the absence of a leak

If you experience alarms in the absence of a leak, try setting an alarm delay. Perform a bump test to ensure proper operation.

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NOTES

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NOTES

Page 72

Critical Environment Technologies Canada Inc.

Unit 145, 7391 Vantage Way, Delta, BC, V4G 1M3, Canada

Toll Free: +1.877.940.8741

Tel: +1.604.940.8741 Fax: +1.604.940.8745

www.critical-environment.com

ART20180301-5-ART-Manual-Rev-5

CET ART Operation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual