Critical Environment Technologies GEM-II Operation Manual

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Operation Manual

www.critical-environment.com

GEM-II Self Contained Gas Detector

Rev. E | 2014.10

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GEM-II - Operation Manual Rev. E | 2014.10

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

2.3 Model Designations .....................................................................................................10

2.3.1 Type A – Single Channel ............................................................................................... 10

2.3.2 Type B – Single Channel Controller ............................................................................... 11

2.3.3 Type D – Dual Channel .................................................................................................. 12

2.3.4 Type E– Dual Channel ................................................................................................... 13

3 INSTRUMENT SPECIFICATIONS .........................................................................13

3.1 Technical Specications................................................................................................13

3.2 Standard Enclosure Dimensions ...................................................................................16

3.3 Watertight Enclosure Dimensions ................................................................................16

4 SENSOR SPECIFICATIONS ...................................................................................17

4.1 Sensor Specications ...................................................................................................17

4.2 Remote Sensor Specications ......................................................................................18

4.3 Calibration Extending Firmware (CEF) and Sensor Aging .............................................18

5 FEATURES & FUNCTIONS ....................................................................................19

5.1 Standard Exterior Enclosure .........................................................................................19

5.2 Watertight Exterior Enclosure ......................................................................................20

5.3 Interior System Layout .................................................................................................21

6 INSTALLATION ...................................................................................................... 22

6.1 AC and DC Wiring .........................................................................................................22

6.1.1 Wiring Example 1 .......................................................................................................... 22

6.1.2 Wiring Example 2 .......................................................................................................... 23

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6.1.3 Wiring Example 3 - INCORRECT ..................................................................................... 23

6.1.4 Wiring Example 4 .......................................................................................................... 24

6.1.5 Wiring Example 5 (J2 Removed) ................................................................................... 24

6.1.6 Wiring Example 6 (J2 Removed) ................................................................................... 25

6.2 Sensor Mounting Heights ............................................................................................25

6.3 Standard Enclosure Mounting Components .................................................................26

6.3.1 Enclosure Base .............................................................................................................. 26

6.3.2 Enclosure Top ................................................................................................................ 26

6.3.3 Enclosure Bottom ......................................................................................................... 27

6.4 Remote Sensor Connection ..........................................................................................27

6.5 Wiring Connections ......................................................................................................28

6.5.1 Types A, B and D ............................................................................................................ 28

6.5.2 Type E............................................................................................................................ 28

6.6 Important Notes for Wiring ..........................................................................................29

6.7 System Installation ......................................................................................................29

6.7.1 Low Voltage Power ........................................................................................................29

6.7.2 Wiring to Remote Sensor .............................................................................................. 30

6.7.3 Voltage to Remote Sensors ........................................................................................... 30

6.7.4 Relay Connections......................................................................................................... 30

6.8 Installation Examples ...................................................................................................31

6.8.1 Type A with Internal Sensor and Enclosed Transformer ................................................. 31

6.8.2 Type B with Remote Sensor or Analog Transmitter ........................................................ 32

6.8.3 Type D with One Internal & One Remote Sensor ............................................................ 33

6.8.4 Type E with Two Internal Sensors .................................................................................. 34

7 OPERATION ...........................................................................................................34

7.1 System Operation ........................................................................................................34

7.2 Test Functions ..............................................................................................................35

7.3 Dip Switch Package ......................................................................................................36

7.4 Internal Audible Alarm Operation ................................................................................37

7.5 Jumpers .......................................................................................................................37

7.6 Adjusting Alarm Set Points ..........................................................................................39

7.6.1 Voltage Reference Table for Alarm Settings ................................................................... 41

7.7 Time Delays for Relay Operations .................................................................................42

7.7.1 Procedure for Setting Time Delays .................................................................................44

7.8 Temperature Display - Unit of Measure ........................................................................45

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7.9 Latching Relay Functions .............................................................................................45

7.10 LED Digital Display .....................................................................................................46

8 CALIBRATION ........................................................................................................47

8.1 Calibration Specications .............................................................................................47

8.1.1 Gas ................................................................................................................................ 47

8.1.2 Exception ...................................................................................................................... 47

8.1.3 Regulators & Flow ......................................................................................................... 47

8.1.4 Adapters ....................................................................................................................... 47

8.2 Calibrating Sensors ......................................................................................................48

8.2.1 Calibration Frequency ................................................................................................... 48

8.3 Calibration Procedure ...................................................................................................48

8.4 Calibrating the Internal Sensor ....................................................................................49

8.4.1 Setting Span Gas Value ................................................................................................. 49

8.4.2 Calibrating the Null (Zero) Value ................................................................................... 49

8.4.3 Calibrating the Span Gas ............................................................................................... 50

8.5 Calibrating Second Internal Sensor ..............................................................................51

8.6 Calibrating Remote Sensor ..........................................................................................51

8.6.1 Setting Span Gas Value for Remote Sensor ................................................................... 51

8.6.2 Calibrating the Null (Zero) Value ................................................................................... 51

8.6.3 Calibrating the Span Gas ............................................................................................... 52

8.7 Calibrating 4-20 mA for Incoming Analog Transmitter ................................................53

8.7.1 Using a Current Source to Calibrate the Null .................................................................. 53

8.7.2 Using a Current Source to Calibrate the Span ................................................................ 53

8.7.3 Using a CETCI Analog Transmitter to Calibrate the Null .................................................. 54

8.7.4 Using a CETCI Analog Transmitter to Calibrate the Span ................................................ 54

8.8 Forcing Calibration ......................................................................................................55

9 ACCESSORIES .......................................................................................................56

9.1 Calibration Kit ..............................................................................................................56

9.2 Metal Protective Guard ................................................................................................56

10 MAINTENANCE ..................................................................................................57

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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 Sections 8 Calibration and 10 Maintenance 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

• Disconnect power before servicing

• Caution: More than one live circuit

• Supply: 24 V (nominal, 50 or 60 Hz)

• Certied for electrical shock and electrical re hazard only

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 was purchased or you may contact CETCI directly.

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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 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.

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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 Email: [email protected] 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.

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2 INTRODUCTION

2.1 General Description

Thank you for purchasing our GEM-II self-contained gas detector.

The GEM series gas detection systems are economical, self-contained, gas detectors for nonhazardous (non-explosion rated) commercial applications. They are available in two basic

congurations: one sensor models and two sensor models. The sensors can be congured as one

integral (A-type), one remote (B-type), one integral and one remote (D-type), or two integral (E-type).

A basic system provides one set of LED indicating lights representing “Power”, “Fail”, “Low (Warning) Gas Alarm”, ‘High Gas Alarm”, an integral audible alarm with door mounted silence push-button, audible time delay, eld settable relay time delays and two alarm relays. In either system, the LED lights provide visual indication of the status of each channel (Int = internal sensor, Ext = external sensor or second channel).

Gas specic electrochemical sensors for toxic gases and Oxygen (O2) are available as are MOS solid-state sensors for refrigerants and catalytic sensors for combustible gases. All GEM integral sensors are packaged as plug-in “smart” sensor modules to reduce eld maintenance time.

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

• Single or dual channel

• Network multiple units

• Integral plug & play “smart” sensors or remote sensors

• 4 – 20 mA linear output signal

• Three conduit entry ports

• Thermal resetting fuse

• LED light indicators

• Two 5-amps SPDT relays

• RoHS compliant circuit boards

• CSA & UL certied

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2.3 Model Designations

2.3.1 Type A – Single Channel

Choices for GEM-A:

• One integral electrochemical sensor.

NOTES: Optional LED digital display is shown in the photo.

Opening for integral sensor

(example: CO) to monitor

diused air and gas.

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2.3.2 Type B – Single Channel Controller

Choices for GEM-B:

• One remote catalytic or solid state sensor

• One remote LPT-A or LPT series analog transmitter

NOTES: Optional LED digital display is shown in the photo.

Wiring requirements:

• 3-conductor, 18 gauge to remote sensor.

• 3-conductor shielded to remote analog transmitter.

Plug covering sensor opening

Remote catalytic or

solid state sensor

Remote analog transmitterOR

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2.3.3 Type D – Dual Channel

Choices for GEM-D:

• One integral electrochemical sensor (Channel1) PLUS one remote catalytic or solid state

sensor (Channel 2).

• One integral electrochemical sensor (Channel1) PLUS one remote LPT-A or LPT series analog transmitter (Channel 2).

NOTES: Optional LED digital display is shown in the photo.

Wiring requirements:

• 3-conductor, 18 gauge to remote sensor.

• 3-conductor shielded to remote analog transmitter.

Opening for integral sensor to monitor diused by air and gas.

Remote catalytic or

solid state sensor

Remote analog transmitterOR

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2.3.4 Type E – Dual Channel

Choices for GEM-E:

• Two integral electrochemical sensors (Channel 1 & 2)

NOTES: Optional LED digital display is shown in the photo.

3 INSTRUMENT SPECIFICATIONS

3.1 Technical Specications

GAS TYPE

Carbon Monoxide (CO) Combustible Gases (catalytic)

Hydrogen (H

), Methane (CH4), Propane (C3H8)

Nitrogen Dioxide (NO

) Nitric Oxide (NO) Oxygen (O

)

Refrigerants (solid state)

R22, R134A, R402A, R404A, R407C, R410A, R422A, R422D, R507A

Sulphur Dioxide (SO

)

TVOCs (solid state)

Opening for TWO integral sensors to monitor diused air and gas.

Common application is

engine exhaust: gasoline

or diesel sensors are both integral in the GEM type E version.

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MECHANICAL

Standard Enclosure General purpose PVC Standard Weight 600 g (1.2 lb) Standard Size 5.3” x 6.8” x 2.6” (135 mm x 173 mm x 66 mm)

Watertight Enclosure Water / dust tight polycarbonate Watertight Weight 700 g (1.4 lb) Watertight Size 5.1” x 7.1” x 4.0” (130 mm x 181 mm x 102 mm)

ELECTRICAL

Power Requirement 15 - 30 VDC or 12 - 28 VAC Current Draw Approximately 125 mA

Wiring

VDC three-conductor shielded VAC four-conductor shielded

Circuit

Analog design with microprocessor and user settable time delays, accessible with DIP switches on circuit board.

Fuse Automatic resetting thermal

INPUT / OUTPUT

Outputs Linear 4 - 20 mA (single)

Distance

Maximum 500 ft between controller and remote solid state sensor using minimum 18 gauge wire.

Relays

Two S.P.D.T. dry contact relays, rated 5 amps @ 240 VAC.

NOTES:

1. System is congured such that all relays are “FAIL SAFE” (relay coils are always energized in non-alarm state).

2. Relays are “common” to both channels (activated by either channel).

USER INTERFACE

Display

Common set of LED indicating lights for “Power”, “Fail”, “Low (Warning) Gas Alarm”, “High Gas Alarm”

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Audible

Integral piezo audible alarm rated 80 dB @ 10’ c/w door mounted

silence push-button.

NOTES: Audible alarm & silence push-button are right side mounted on water tight enclosure.

Time Delays

Delay “ON” (on make),

DIP switch

Delay “OFF” (on break),

DIP switch

Audible (on make),

DIP switch

Low alarm relay: 2 minutes High alarm relay: 5 minutes

Also known as “minimum run time”

Low alarm relay: 10 minutes High alarm relay: not available

10 minutes

NOTES: Time delays can be changed by user.

Reference Section 7 Operation. DIP switches are still used to enable or disable time delays.

SENSOR

Enclosure Molded PVC

Integral

Electrochemical only

NOTES: All integral electrochemical gas sensors are packaged as “smart” sensor modules.

Remote

Solid State sensor for refrigerants and TVOCs Catalytic sensor for combustible gases Analog transmitter, LPT-A or LPT (4 – 20 mA signal)

ENVIRONMENTAL (sensor dependant)

Operating Temperature -20°C to 50°C (-5°F to 120°F) Operating Humidity 15 - 90% RH non-condensing

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CERTIFICATION

CSA Certied UL Certied

3.2 Standard Enclosure Dimensions

3.3 Watertight Enclosure Dimensions

5.25” (133 mm)

2.625” (67 mm) 6.75” (172 mm)

5.13” (130 mm)

7.13” (181 mm)4.0” (102 mm)

4.38” (102 mm)

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4 SENSOR SPECIFICATIONS

4.1 Common Sensor Specications

Carbon Monoxide (CO)

Type Electrochemical Response Time <30 seconds to 90% of signal response Operating Temperature 0°C to 50°C (32°F to 120°F) Repeatability ± 10% of set point Life Span 3 years in air (under normal conditions)

Nitric Oxide (NO)

Type Electrochemical Response Time <30 seconds to 90% of signal response Operating Temperature 0°C to 50°C (32°F to 120°F) Repeatability ± 10% of set point Life Span 2 years in air (under normal conditions)

Nitrogen Dioxide (NO

)

Sulphur Dioxide (SO

)

Type Electrochemical Response Time <30 seconds to 90% of signal response Operating Temperature 0°C to 50°C (32°F to 120°F) Repeatability ± 10% of set point Life Span 2+ years in air (under normal conditions)

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Temperature (°C or °F) Range -20°C to 40°C (-4°F to 104°F)

4.2 Remote Sensor Specications

1. Remote sensor module: The remote sensor housing accommodates one catalytic or one solid-

state sensor. 2. Any 4-20 mA analog transmitters manufactured by CETCI (LPT-A or LPT series).

Combustible Gases

Type Catalytic Response Time <10 seconds to 90% of signal response Operating Temperature -10°C to 50°C (14°F to 122°F) Repeatability ± 10% of set point Life Span 5 years in air (under normal conditions) Typical Gas Examples Hydrogen (H

), Propane (C3H8), Methane (CH4)

Refrigerants

Type Solid state Response Time <120 seconds to 90% of signal response Operating Temperature 0°C to 40°C (32°F to 104°F) Long Term Drift < 5% signal loss / month at ambient temperatures Repeatability ± 10% of set point Life Span 5 years in air (under normal conditions)

Typical Gas Examples

R11, R12, R22, R134A, R404A, R407C, R410A, R422A, R422D, R438A, R507A

4.3 Calibration Extending Firmware (CEF) and Sensor Aging

GEM systems with integral electrochemical sensors have been programmed with our CEF (Calibration Extending Firmware). This rmware takes into consideration the aging of the electrochemical CO, NO and NO2 sensors so that less frequent calibrations are acceptable in non-critical applications such as parking garages. The system tracks the age of the sensor and automatically compensates for the degraded output of the sensor as it ages.

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5 FEATURES & FUNCTIONS

5.1 Standard Exterior Enclosure

NUMBER FEATURE FUNCTION

➊

Digital Display Optional LED digital display

➋

LED Sensor Indicators Indicates Channel 1 or Channel 2

➌

Door Latch Secures door

➍

LED Indicators Indicates Power & Fail

➎

Door Screw Secures door

➏

Gas Alarm LED Indicates High and Low alarm levels

➐

Alarm Acknowledge-Test

Push button for alarm acknowledgement & testing

➑

Audible Alarm Internal audible alarm

➒

Sensor Opening To monitor diused air and gas

➓

Padlock Opening For padlock





















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5.2 Watertight Exterior Enclosure

NUMBER FEATURE FUNCTION

➊

Digital Display Optional LED digital display

➋

LED Sensor Indicators Indicates Channel 1 or Channel 2

➌

Audible Alarm

Watertight audible alarm & silence push button

➍

LED Indicators Indicates Power & Fail

➎

Gas Alarm LED Indicates High and Low alarm levels

➏

Silence Button Watertight silence push button

➐

Splash Guard

Optional splash guard secured with stainless steels screws

NOTE: Audible alarm and silence push button were moved to right of enclosure to maintain

water tightness of enclosure.















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5.3 Interior System Layout

NUMBER FEATURE FUNCTION

➊

Dip Switches For access to time delays

➋

Dry Contact Relays For Low & High Alarm

➌

Jumpers

For calibrations & other service set-up functions

➍

Wiring Terminal Pluggable wiring terminal

➎

Push Buttons

For service access & additional test functions

➏

Half Wave / Full Wave Jumper (J2) For conguring for 24 VAC operation













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6 INSTALLATION

6.1 AC and DC Wiring

The GEM is a low voltage powered gas detector. All wiring should be run within properly grounded (earth or safety) conduit. Signal output and supply should be in shielded cable. The remote sensor wiring should be done with four conductor shielded 18 awg stranded wire in a separate conduit from all other wiring.

THREE WIRE CONNECTION If providing VDC or VAC Ground Referenced use terminals 12 & 13. This is now a Half Wave device in this conguration Please observe polarity. The Ground referenced AC must be connected to terminal 12. J2 open. Factory default.

FOUR WIRE CONNECTION If providing VAC power, using terminals 13 & 14. This is now a Full Wave device in this conguration, and requires a isolated supply (separate 24 VAC transformer with NO Ground connections) and J2 be shorted.

See drawings below – if uncertain contact CETCI service for assistance.

IMPORTANT: WIRING EXAMPLES: NON GROUNDED REFERENCE SUPPLIES ONLY

6.1.1 Wiring Example 1

Wiring Example 1

24 VAC

GND

SIGNAL

GND

120 VAC

Controller

GEM-II

24 VAC

120 VAC

24 VAC

Isolated

No Ground Reference

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6.1.2 Wiring Example 2

Wiring Example 2

24 VDC

GND

SIGNAL

120 VAC

Controller

GEM-II

Power

Supply

6.1.3 Wiring Example 3 - INCORRECT

24 VAC

120 VAC

Wiring Example 3

INCORRECT

24 VAC

GND

SIGNAL

GND

Controller

GEM-II

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6.1.4 Wiring Example 4

Wiring Example 4

24 VDC

GND

SIGNAL

GND

24 VDC

120 VAC

Controller

GEM-II

Power

Supply

6.1.5 Wiring Example 5 (J2 Removed)

120 VAC24 VAC

Wiring Example 5

24 VAC

GND

SIGNAL

GND

Controller

GEM-II

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6.1.6 Wiring Example 6 (J2 Removed)

120 VAC24 VAC

Wiring Example 6

24 VAC

GND

Controller

GEM-II

Rectied

SIGNAL

GND

24 VDC

6.2 Sensor Mounting Heights

GAS APPLICATIONS / TYPES SUGGESTED MOUNTING HEIGHT

Carbon Monoxide (CO) Gas engine exhaust

4 - 6 ft from the oorNitric Oxide (NO) Diesel engine exhaust

Nitrogen Dioxide (NO

) Diesel engine exhaust

Sulphur Dioxide (SO

) All

6” from the oor

Combustibles

Propane (C

3H8

)

Methane (CH

)

on or near ceiling (within 12”)

Hydrogen (H

)

Refrigerants All

6: fromthe oor or near likely spot for

leakage

NOTE: CETCI considers 4 - 6 ft from the oor as the “Breathing Zone” when it applies to sensors installed for vehicle exhaust applications.

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6.3 Standard Enclosure Mounting Components

6.3.1 Enclosure Base

NUMBER FEATURE

➊

Molded-in mounting bracket

➋

Conduit Entry

➌

Alternative mounting holes

6.3.2 Enclosure Top

NUMBER FEATURE

➊

Molded-in mounting bracket

➋

Conduit Entry

➌

Alternative mounting holes























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6.3.3 Enclosure Bottom

NUMBER FEATURE

➊

Molded-in mounting bracket

➋

Conduit Entry

➌

Alternative mounting holes

6.4 Remote Sensor Housing











Catalytic or solid state sensor breathes through these openings.

Wiring:

1. Red (+)

2. Yellow (Signal)

3. Black (-)

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6.5 Wiring Connections

6.5.1 Types A, B and D

6.5.2 Type E

Has a sticker placed over area that says See Wiring. Remove to install J2.

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6.6 Important Notes for Wiring

GEM is a low voltage powered gas detector. If providing VAC power, use terminals 12 & 13. If providing VDC power, use terminals 12 & 13 and observe polarity. Reference Section 6.5 Wiring Connections.

Fan / alarm control wiring is terminated at terminals 1 to 6. The relays are designed to switch fan

“starters” not the fans directly. The relay contacts are rated 5 amps @ 240 VAC each, S.P.D.T.

An analog output of 4 - 20 mA is available for one or two sensors. Channel 1 sensor analog outputs are achieved by wiring to terminals 7 & 8 and observe polarity. Channel 2 sensor analog outputs are achieved by wiring to terminals 10 & 11.

Specic GEM types will also act as controllers to which remote transmitters can be connected. GEM Type “B” and type “D” will accommodate one remote sensor or analog transmitter. To connect one remote sensor or analog transmitter to a GEM, use terminals 9, 10 & 11 and observe polarity.

6.7 System Installation

There are two exterior mounting brackets, one top and one bottom of the base of the enclosure. Alternatively, remove the slot / Robertson head screw securing the hinged door. There are four only 3/16” diameter corner mounting holes located inside the system enclosure base. Secure the system to any at surface.

6.7.1 Low Voltage Power

Drill out one or more of the PVC conduit entry hole plugs located at bottom left or right or top left edge of system enclosure base. Reference Section 6.3 Standard Enclosure Mounting Components.

If supplying VAC operational power, pull two wires suitable for low voltage from power source to the terminals 13 & 14 for Full Wave operation.

If supplying VDC or VAC, wire to terminals 12 & 13. J2 Removed. Factory default.

NOTE: Maximum distance between the GEM and a remote sensor should not exceed 500 ft.

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6.7.2 Wiring to Remote Sensor

Three-conductor, 16 - 18 gauge, stranded wire is required between the control panel and the remote solid-state sensor (reference Section 6.8 Installation Examples, Type D with Onboard & Remote Sensors and Type E with Two Onboard Sensors). Under most local electrical codes, low voltage wires cannot not be run within the same conduit as line voltage wires. 3-conductor, 16

- 18 gauge wire / cable must be shielded when connecting to a remote analog transmitter. The LPT-A or LPT series remote analog transmitter enclosures have several conduit entry locations (general purpose enclosure).

NOTE: DO NOT use solid-core wire for connection to wiring terminal strip. Any damage caused by

using solid-core wire will void warranty. Use stranded wire within conduit ONLY.

6.7.3 Voltage to Remote Sensors

The voltage supplied by the controller to remote solid state sensors should measure approximately 5.0 VDC ± 2%, at the remote sensor. Voltage supplied by the controller to remote analog transmitters should measure approximately 24 VDC nominal. This voltage is factory set at time of manufacturing. If these voltages are not attained after installation, the wrong gauge wire may have been used or the wiring run is too long.

The remote sensor housing comes with a 3/4” conduit thread and nut to allow installation in any standard electrical junction box (to be supplied by the installer). Connect three low voltage wires between it and the controller and observe polarity.

6.7.4 Relay Connections

System relays are dry contacts and designed to operate fan starters or coils to control equipment that draws more than 5 amps start-up and / or operational current.

NOTES:

1. The system does not provide any power from these terminals. Dry contacts operate like a switch to simply activate (switch on) or de-activate (switch o) equipment to be controlled, such as fan starters.

2. System relays are S.P.D.T. (single pole, double throw) thereby providing one set of usable dry contacts for each relay. Because the GEM series systems are designed to be fail-safe, any equipment to be controlled by the system relays should be wired to the “NC” (Normally closed) and “COM” (Common) terminals. The relay coils are normally energized in nonalarm state for fail-safe operation.

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Upon application of power, the green LED light indicator(s) will illuminate and the LED between Sen-1 & Sen-2 will be blinking but all alarms are disabled for 2 minutes for a system warm up period. After the warm up period, the system may exhibit gas alarm condition(s) if one or both of the sensors has not completely stabilized during the warm up period. This is normal and the length of time the gas alarms exist is dependent upon the length of time since the unit was last powered up and the state of the environment it is installed in. After warm up, only the green power LED(s) illuminate indicating normal operation and the relays are energized indicating normal “Fail-safe” status.

6.8 Installation Examples

6.8.1 Type A with Internal Sensor and Enclosed Transformer

Line voltage side of enclosed transformer.

Low voltage and line voltage are segregated in this transformer.

Line voltage can enter through the upper conduit entry port.

GEM Type A is a controller with one integral electrochemical sensor.

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NOTES for Type A with Enclosed Transformer:

1. Enclosed transformer shown in this photo is an optional accessory.

2. Conduit stubs shown in this photo are not supplied.

3. This photo is representative of just one way to install transformer.

4. This photo shows the optional LED digital display

6.8.2 Type B with Remote Sensor or Analog Transmitter

Standard electrical junction box must be supplied by installer

Remote sensor

Conduit and 3-conductor wire to remote sensor supplied by installer.

Rubber plug covering what would normally be opening for sensor to breathe.

Installer supplied low voltage operating power.

GEM Type B is a controller with one remote catalytic or solid state sensor or one remote analog transmitter.

This image shows the GEM Type B with a remote catalytic or solid state sensor.

Mounting height 4 - 6 ft from the oor (the “breathing zone”)

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NOTES for Type B with Remote Sensor or Analog Transmitter:

1. This photo shows the optional LED digital display.

2. In this installation, the remote sensor is for heavier than air gases such as propane or a solid state refrigerant gas so the sensor should be installed 6” from the oor or near the most likley are to leak.

6.8.3 Type D with One Internal & One Remote Sensor

GEM Type D is a controller with one integral electrochemical sensor and one remote catalytic, or solid state sensor, or one remote analog transmitter.

Mounting height 4 - 6 ft from the oor (the “breathing zone”)

Standard electrical junction box must be supplied by installer

Remote sensor

Conduit and 3-conductor wire to remote sensor supplied by installer.

Installer supplied low voltage operating power.

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NOTES for Type D with One Internal & One Remote Sensor:

1. This photo shows the optional LED digital display.

6.8.4 Type E with Two Internal Sensors

7 OPERATION

7.1 System Operation

In the event of a burned-out, damaged or missing catalytic or solid state sensor element, the controller will indicate fail condition on the front door by illumination of the red fail LED. At this point, both system relays will have reversed state (de-energized) and anything connected to them will be running continuously. Normal system operation will not occur until the fault condition has been rectied. The same condition will occur if the 4 - 20 mA signals from the remote LPT-A or LPT transmitter are broken or interrupted.

NOTES:

1. Fail condition overrides any system time delays that may have been set.

2. Reference photo in Section 5.1 Standard Exterior Enclosure for location of LEDs, and test-

buttons.

Two integral electrochemical sensors such as CO (gas engine exhaust) & NO2 (diesel engine exhaust)

GEM Type E is a controller with two integral electrochemical sensors.

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In the event of a gas build up beyond the preset low alarm trip point, the CH-1-Int. LED (outer door right side) illuminates, the “Low” alarm level LED (red - outer door left side) illuminates and the low alarm relay de-energizes activating anything controlled by it. If a time delay “ON” has been set (internal DIP switches), then the “Low” alarm LED will “ash” indicating the time delay has been activated and the low alarm relay will not de-energize until the delay has timed out. Once the low alarm relay has de-energized, it will re-energize automatically once the gas alarm condition goes away, unless a time delay “OFF” (minimum run time - internal DIP switches) has been programmed. The same procedure applies to CH-2 Ext. in the case of a two channel (two sensors) system.

In the event of a gas build up beyond the preset high alarm trip point, the “CH-1” LED (outer door right side) illuminates, the “High” alarm level LED (red - outer door left side) illuminates and the high alarm relay de-energizes activating anything controlled by it. If a time delay “ON” has been set (internal DIP switches), then the “High” alarm LED will “ash” indicating the time delay has been activated and the high alarm relay will not de-energize until the delay has timed out. Once the high alarm relay has de-energized, it will re-energize automatically once the gas alarm condition has dispatched. The same procedure applies to the second channel in the case of a two channel (two sensors) system.

NOTE: No minimum run time delay is provided for the high alarm relay.

7.2 Test Functions

A momentary test feature is provided to allow the user to test basic functionality of the circuit. Press the “UP” push-button (internal) for 5-seconds, the audible alarm will beep once to indicate it is in the 5-second test function. Release the “UP” push-button after 5-seconds and an automatic test function will occur.

Alternatively use the silence push-button on the front door to perform the same function.

The low alarm relay will de-energize and the low alarm LED on the front door will illuminate. The low alarm relay will then re-energize while the low alarm LED stays lit for 10-seconds.

Next, the high alarm relay will de-energize, the high alarm LED on the front door will illuminate and the audible alarm will activate. The relay will then re-energize but the high alarm LED and the audible alarm will stay activated for 10-seconds. After 10-seconds, everything resets to normal operating condition.

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If a longer test sequence is desired, hold down the “UP” push-button for 10-seconds to activate the low alarm relay, high alarm relay, low alarm LED, and high alarm LED for 15-minutes.

To abort this test, press the internal “UP” push-button or the exterior silence push-button and everything will reset to normal operating condition.

If the GEM is equipped with a digital display, it will indicate “test” during this test period.

Voltage Output to Test Points “TP-1” and “TP-2”:

NOTE: The voltage output when jumper J6 is set to the resting position “1” is 4.0 VDC.

Attach the meter leads to the two test points (TP-1 & TP-2) located just below the high alarm relay (RL V2) on the main circuit board. Set the meter to volts DC with one decimal point. The range of 0-4.0 VDC is equal to the full measurement range of the sensor. Eg. HVAC CO sensor has a standard measurement range of 0 - 200 ppm. Therefore 4.0 VDC = 200 ppm.

Move the Jumper J6 to position 2 when monitoring the Internal Sensor or in position 3 for the External Sensor.

7.3 Dip Switch Package

Dip switch - position description:

• 5) Audible “on” / “o”

• 4) Audible alarm time delay “on” (5-min.)

• 3) High gas alarm time delay “on” (5-min.)

• 2) Low gas alarm time delay “o” (10-min.)

• 1) Low gas alarm time delay “on” (2-min.)

Located upper left corner of main circuit board.

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NOTES:

1. Dip switches in the “up” position are “on”.

2. Time delay durations can be changed by user.

3. Fixed delay durations indicated above are factory default settings.

7.4 Internal Audible Alarm Operation

If DIP switch “5” is in the “up” position, the internal audible alarm responds to whatever commands it is given by the microprocessor in the circuit.

If DIP switch “5” and DIP switch “4” are in the “up” position, the audible alarm responds after the user preset time delay function for the audible alarm has timed out.

If DIP switch “5” is in the “down” position, the audible alarm does not respond at all.

The internal audible alarm normally activates with a steady tone when a “high” gas alarm condition exists.

The internal audible alarm normally activates with a pulsing tone when a fault condition exists.

A fault condition could consist of any of the following:

• Remote catalytic or solid state sensor failure (open loop)

• Analog signal from a remote LPT-A or LPT is not registering with the GEM.

• Smart sensor board is not plugged into the main board.

NOTE: Fault conditions automatically override the ON / OFF DIP switch “5” if it has been set to the “up” position to turn the audible alarm o.

7.5 Jumpers

There are two banks of jumpers located directly below the DIP switches. One bank of nine (9) jumpers (“J7” upper bank) and one bank of four (4) jumpers (“J6” lower bank). These jumpers allow the user to perform a wide range of set up and calibration functions. The following table details the jumper settings for each bank of jumpers and explains the function enabled when these jumper positions are selected.

NOTE: Always set jumper from J6 rst followed by jumper from J7.

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FUNCTION DESIRED

J6 LOWER

JUMPER BANK

J7 UPPER

JUMPER BANK

Resting (Jumpers for the Upper Bank, J7 are disabled)

1 1

Setting Span Gas Value 2 (Internal Sensor) 2 Perform Zero (Null) Calibration 2 (Internal Sensor) 3 Perform Span Calibration 2 (Internal Sensor) 4 Adjust Low Gas Alarm Ascending Value 2 (Internal Sensor) 5 Adjust High Gas Alarm Ascending Value 2 (Internal Sensor) 6 Adjust Low Gas Alarm Descending Value 2 (Internal Sensor) 7 Adjust High Gas Alarm Descending Value 2 (Internal Sensor) 8 Enable / Disable Current Output 2 (Internal Sensor) 9 Setting Span Gas Value 3 (External Sensor) 2 Perform Zero (Null) Calibration 3 (External Sensor) 3 PERFORM SPAN CALIBRATION 3 (External Sensor) 4 Adjust Low Gas Alarm Ascending Value 3 (External Sensor) 5 Adjust High Gas Alarm Ascending Value 3 (External Sensor) 6 Adjust Low Gas Alarm Descending Value 3 (External Sensor) 7 Adjust High Gas Alarm Descending Value 3 (External Sensor) 8 Enable / Disable Current Output 3 (External Sensor) 9

NOTE: Jumper - 4 location on the lower jumper bank (J6) is used to set custom time delays for relays and internal audible alarm. These functions will be explained in another section of this manual.

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NOTE: In this photo, the jumper tab for both banks of jumpers is covering “J1” resting position.

7.6 Adjusting Alarm Set Points

Equipment Required: Voltmeter 1 mV resolution if using Open Door calibration or setting Alarms, Philips screw driver if using Open Door calibration or setting Alarms.

The GEM is congurable as single or dual channel detector and as such there are two ascending gas alarm set points and two descending gas alarm set points. Almost all installations of the

GEM will use the factory default alarm set points. Default set points are as follows:

SENSOR LOW ALARM HIGH ALARM RANGE

Carbon Monoxide (CO) 25 ppm 100 ppm 200 ppm Nitric Oxide (NO) 35 ppm 50 ppm 100 ppm Nitrogen Dioxide (NO

) 0.7 ppm 1.5 ppm 10 ppm

Sulphur Dioxide (SO

) 1.0 ppm 5.0 ppm 20 ppm

Propane (C

3H8

), Methane

(CH4) or Hydrogen (H2)

10% LEL 20% LEL 50% LEL

Refrigerants 500 ppm 1,000 ppm 2,000 ppm Temperature (

C) 30oC 40oC 60oC

Temperature (

F) 75oF 90oF 100oF

J7 - 9 J7 - 8

J7 - 7 J7 - 6 J7 - 5

J7 - 4 J7 - 3

J7 - 2 J7 - 1 (Resting)

J6 - 4 J6 - 3

J6 - 2 J6 - (Resting)

Upper bank jumpers set (J7). This bank of jumpers allows specic functions for internal and external sensors. The target sensor is set using the lower bank of jumpers.

Lower bank jumper set (J6). This bank of jumpers allows set up and conguration for both internal and external sensors.

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Reference table in Section 7.5 Jumpers. If the GEM has been equipped with an LED digital display, set values according to what is displayed. If the GEM has been supplied without a digital display, you will require a digital multi-meter.

Attach the meter leads to the two test points (TP-1 & TP-2) located just below the high alarm relay (RL V2) on the main circuit board (reference photo below). Set the meter to volts DC with one decimal point. Time delays are set using a voltage reference of 0-4 VDC. Reference the tables in Section 7.7 Time Delays for Relay Operations.

Move the jumper on the lower jumper bank J6 from its resting position (P-1) and place it on the appropriate jumper position as indicated in the table below top achieve the desired alarm setting. Use the “UP” or “DOWN” push-buttons to set the desired alarm value. Once all alarm settings have been set to desired values, move the jumper back to its resting position on the lower jumper bank J6. All new values will be written to the EEPROM.

Test Points: TP-1 & TP-2

FUNCTION DESIRED

J6 LOWER JUMPER BANK J7 UPPER

JUMPER

BANK

Int Ext

SET LOW ASCENDING ALARM VALUE P2 P3 P5 SET HIGH ASCENDING ALARM VALUE P2 P3 P6 SET LOW DESCENDING ALARM VALUE P2 P3 P7 SET HIGH DESCENDING ALARM VALUE P2 P3 P8

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Alarm settings for GEM detectors are voltage settings. The range of 0 - 4.0 VDC is equal to the full measurement range of the sensor. E.g. HVAC CO sensor has a standard measurement range of 0-200 ppm. Therefore, 4.0 VDC = 200 ppm. Reference the formula below and the table in Section 7.5 Jumpers.

DESIRED SET POINT / SENSOR RANGE = % OF RANGE

e.g. 100 ppm / 200 ppm = 50% of range

50% OF 4.0 VDC = 2.0 VDC.

Therefore the required voltage setting to achieve an alarm set point of 100 ppm is 2.0 VDC.

7.6.1 Voltage Reference Table for Alarm Settings

SENSOR / GAS MEASUREMENT RANGE

LOW ALARM

SET VOLTAGE

HIGH ALARM SET VOLTAGE

CO 0 - 200 ppm 25 ppm / 0.50 VDC 100 ppm / 2.00 VDC CO 0 - 200 ppm 35 ppm / 0.70 VDC 200 ppm / 4.00 VDC NO

0 - 10 ppm 0.7 ppm / 0.28 VDC 1.0 ppm / 0.40 VDC

0 - 10 ppm 2.0 ppm / 0.8 VDC 5.0 ppm / 2.00 VDC

0 - 25.0% Volume 19.5% Vol. / 3.12 VDC 23.0% Vole. / 3.68 VDC

0 - 25.0% Volume 17.0% Vol. / 2.72 VDC 18.5% Vol. / 2.96 VDC

0 - 2.00 ppm 0.10 ppm / 0.20 VDC 0.30 ppm / 0.60 VDC

0 - 2.00 ppm 0.30 ppm / 0.60 VDC 1.00 ppm / 2.00 VDC NO 0 - 100 ppm 25 ppm / 1.00 VDC 50 ppm / 2.00 VDC H

S 0 - 50 ppm 10 ppm / 0.80 VDC 15 ppm / 1.20 VDC

0 - 20 ppm 2 ppm / 0.40 VDC 5 ppm / 1.00 VDC H

0 - 4,000 ppm 1000 ppm / 1.00 VDC 2000 ppm / 2.00 VDC C

3H8

0 - 50% LEL 10% LEL / 0.80 VDC 20% LEL / 1.60 VDC C

3H8

0 - 50% LEL 20% LEL / 1.60 VDC 40% LEL / 3.20 VDC CH

0 - 50% LEL 10% LEL / 0.80 VDC 20% LEL / 1.60 VDC CH

0 - 50% LEL 20% LEL / 1.60 VDC 40% LEL / 3.20 VDC H

0 - 50% LEL 10% LEL / 0.80 VDC 20% LEL / 1.60 VDC Freons

(R series)

0-2000 ppm 500 ppm / 1.00 VDC 1000 ppm / 2.00 VDC

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7.7 Time Delays for Relay Operations

GEM oers a wide range of time delay settings that are user congurable. If the GEM has been equipped with the LED digital display option, read the values on the display as you change them to suit your application. If the GEM does not have a digital display, you will require a digital volt meter set to volts DC, one decimal point. The following tables are a guideline to follow to achieve desired time delays. Voltage reference is 0 - 4 VDC.

VOLT READING AT TEST POINTS TIME DELAY IN MINUTES

0 N/A

0.02 0.1

0.04 0.2

0.06 0.3

0.08 0.4

0.10 0.5

0.12 0.6

0.14 0.7

0.16 0.8

0.18 0.9

0.20 1.0

0.22 1.1

0.24 1.2

0.26 1.3

0.28 1.4

0.30 1.5

0.32 1.6

0.34 1.7

0.36 1.8

0.38 1.9

0.40 2.0

0.42 2.1

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VOLT READING AT TEST POINTS cont’ TIME DELAY IN MINUTES cont’

0.44 2.2

0.46 2.3

0.48 2.4

0.50 2.5

0.52 2.6

0.54 2.7

0.56 2.8

0.58 2.9

0.60 3.0

0.62 3.1

0.64 3.2

0.66 3.3

0.68 3.4

0.70 3.5

0.72 3.6

0.74 3.7

0.76 3.8

0.78 3.9

0.80 4.0

- -

1.0 5.0

1.2 6.0

1.4 7.0

1.6 8.0

1.8 9.0

2.0 10.0

2.2 11.0

2.4 12.0

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VOLT READING AT TEST POINTS cont’ TIME DELAY IN MINUTES cont’

2.6 13.0

2.8 14.0

3.0 15.0

3.2 16.0

3.4 17.0

3.6 18.0

3.8 19.0

4.0 20.0

7.7.1 Procedure for Setting Time Delays

Move jumper from resting position (position-1) on lower bank jumper set (J6) to position-4. This is the system conguration position. Next, select the jumper position on upper bank jumper set (J7) to achieve the desired function. Reference photo in Section 7.5 Jumpers. Reference the table below for appropriate jumper position locations.

Once the desired jumper position has been achieved, use the “UP” or “DOWN” push-buttons to make changes. Changes can be viewed on the LED digital display if the GEM is equipped with one. If the GEM is not equipped with a digital display, connect a digital multi-meter to test points “TP-1” and “TP-2” and use the voltage tables in Section 7.7 Time Delays for Relay Operations.

Once desired time delays have been set, move jumper back to resting position (P1) of upper jumper bank J7. If additional time delays are desired, move the jumper to the appropriate position and once again use the push-buttons to set desired voltage to achieve desired time delay.

Once all desired time delay settings have been achieved, move jumper back to position-1 on upper jumper bank J7 and move jumper back to position-1 on lower jumper bank J6. At that point, all new settings will be written to the EEPROM.

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FUNCTION UPPER JUMPER BANK “J7”

Low alarm “ON” time delay P2 Low alarm “OFF” time delay P3 High alarm “ON” time delay P4 Audible alarm “ON time delay P5

7.8 Temperature Display - Unit of Measure

The GEM systems all have an “on board” temperature chip from which information is used to temperature compensate certain sensors. This temperature chip can also be used as a second sensor in applications where the user requires both a gas measurement and a temperature measurement. To switch between Celsius and Fahrenheit displayed values, follow this procedure.

Move jumper from resting position (position-1) on lower bank jumper set (J6) to position-4 and jumper on J7 to position-8. Now pressing the “UP” push-button will display the temperature in Celsius and the output to test points “TP-1” and “TP-2” is 4.0 V. If the “DOWN” push-button is pressed, the temperature is displayed in Fahrenheit and the output to the test points is 0 V.

Once the desired unit of measure has been achieved, move jumper back to position-1 on upper jumper bank J6. At that point, all new settings will be written to the EEPROM.

NOTE: Temperature sensor is always considered channel-2 (external).

7.9 Latching Relay Functions

The GEM relays can be congured as “latching” for some applications.

To achieve this, move the jumper from resting position (position-1) on lower bank jumper set (J6) to position-4. This is the system conguration position. Next, select the jumper position-9 on upper bank jumper set (J7).

Pressing the “UP” push-button activates the “latching” function and output to test points “TP-1” and “TP-2” is 4 V. Pressing the “DOWN” push-button de-activates the latching function and the output to test points “TP-1” and “TP-2” is 0 V.

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Once the desired latching or non-latching function has been achieved, move jumper back to position-1 on upper jumper bank J7 and move jumper back to position-1 on lower jumper bank J6. At that point, all new settings will be written to the EEPROM.

7.10 LED Digital Display

The GEM system allows for a certain amount of customization of the LED digital display:

• The display can be switched completely o.

• The display brightness level can be adjusted to low or high for best visibility in your

application.

• The display can indicate the gas type only with no numerical value for some applications.

FUNCTION JUMPER SETTING

Switch digital display “ON” Jumper “J3” bridge P2 & P3 Switch digital display “OFF” Jumper “J3” bridge P1 & P2 Low brightness level for display Jumper “J4” bridge P1 & P2 High brightness level for display Jumper “J4” bridge P2 & P3 Display only gas name (acronym) Jumper “J5” bridge P1 & P2 Display gas values as well as gas name Jumper “J5” bridge P2 & P3

NOTES:

1. The default setting for detectors leaving the CETCI factory with an LED digital display are:

I. Display is “ON” II. Brightness level is “Low” III. Display indicates gas type and gas value.

2. The typical operation of the LED digital display is: Gas name is shown for 1-second then gas

value is shown for 2-seconds. The sequence is the same for 1 or 2-channel systems.

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8 CALIBRATION

8.1 Calibration Specications

8.1.1 Gas

Calibration span gases should be at least ± 5% accuracy and have a current date stamp. Gas generators should have a current dated cell installed. Service personnel should ow zero emissions air or 20.9% volume Oxygen (O2) before attempting to null adjust toxic gas sensors. In some cases Nitrogen (N2) can be substituted for zero air. Contact CETCI for clarication. Nitrogen (N2) is required to null (zero) Oxygen (O2) and Carbon Dioxide (CO2) sensors.

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 transmitters. Follow manual instructions carefully.

8.1.2 Exception

Flow Nitrogen (N2) over Oxygen (O2) sensors before attempting to null adjust them. If the service person is condent of air quality and is careful (do not exhale in the direction of the Oxygen sensor being serviced while span adjusting). Oxygen in the breathing environment can be used as a fairly accurate source of span gas (20.9% volume) “in a pinch”. It is not recommended to use this procedure for all span adjustments of Oxygen sensors.

8.1.3 Regulators & Flow

Calibration gases that are lighter than or the same weight as air (CO, O2, etc.) should be owed at

0.5 LPM. Gases heavier than air (NO2, Cl2, etc.) should be owed between 0.5 and 1.0 LPM. Fixed ow regulators provide more accuracy. Gases should be owed over the sensor for at least 2.5 - 4 minutes. Carbon Monoxide sensors settle out very quickly, but sensors for reactive gases (NH3, etc.) will take longer to stabilize to the calibration gas. All cylinder regulators supplied by CETCI use a xed ow orice.

8.1.4 Adapters

The proper calibration adapter should be utilized to allow the gas to properly diuse around the sensor. They are available from CETCI. A humidication chamber is recommended to be utilized for all catalytic and solid state sensors except Ammonia. This is also available from CETCI.

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8.2 Calibrating Sensors

8.2.1 Calibration Frequency

• Parking garage detectors: Once every 12 months

• OHS applications: Once every 6 months (OHS: Occupational Health & Safety)

• Sensor targeting gases with very low TLVs: Chlorine (Cl2), Ozone (O3), etc.

Ethylene Oxide (C2H4O), etc.: Once every 6 months.

Gas Testing Frequency/Bump Testing: For the purposes of safety in OHS applications, sensors

should be gas tested once every month to conrm response.

NOTE: A calibration label should be applied after every calibration to conrm work performed

and the date it was conrmed. If a controller is involved, the alarm set points should be indicated on a label on the front door of the enclosure so anyone working in the environment can be aware.

Calibration is achieved at the GEM controller if the sensor is integral. If the sensor is remote (LPT-A or LPT series analog transmitter) the calibration is achieved at the transmitter using the procedure indicated in the operation manual provided with it.

Required Equipment: Digital multi-meter, Calibration kit, Calibration gases

Users can order the calibration kit, calibration accessories and/or gases from any CETCI authorized distributor or they can supply their own gas and equipment as long as the gas meets the minimum specications.

8.3 Calibration Procedure

The calibration procedure within the second generation GEM controller is jumper automated (there are no potentiometers to adjust). To achieve calibration the user must rst tell the GEM what concentration of span he is going to ow over the sensor. Within the controller, calibration is a voltage setting. The range of 0-4.0 VDC is equal to the full measurement range of the sensor. Eg. HVAC CO sensor has a standard measurement range of 0 - 200 ppm. Therefore 4.0 VDC = 200 ppm. Prior to attempting to calibrate, determine or calculate the voltage value required. Consult the 7.6.1 Voltage Reference Table for Alarm Settings in Section 7.6 Adjusting Alarm Set Points for standard voltages. If the value desired is not indicted, use the following formula to calculate the

voltage required:

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CALIBRATION SPAN GAS VALUE / 50% OF RANGE SENSOR RANGE

= % OF RANGE

e.g. 100 ppm / 200 ppm = 50% of 4.0 VDC = 2.0 VDC

Therefore the required voltage setting to calibrate with 100 ppm is 2.0 VDC.

NOTE: When calibrating solid-state sensors for combustibles or refrigerants, the span gas

must be humidied. The use of a CETCI humidication chamber is required. The humidication chamber sits in line between the cylinder of span gas and the calibration adapter. Remove the sponge inside the chamber and wet it under the tap. Squeeze out the excess water so it is not dripping wet and place it back inside the chamber. As gas ows over through the chamber, it absorbs water which acts to humidify it and the humidied span gas ows over the sensor.

8.4 Calibrating the Internal Sensor

8.4.1 Setting Span Gas Value (internal sensor)

Step 1:

Move jumper on J6 to position-2 and move jumper on J7 to position-2. The audible alarm beeps once for conrmation. The system is now waiting for the user to set the desired value.

Step 2:

Attach digital multi-meter leads to test points TP-1 and TP-2.

Step 3:

Using the UP or DOWN push-buttons, achieve the calculated voltage on the digital multi-meter. Reference Section 8.3 Calibration Procedure.

Step 4:

Move jumpers from J6 & J7 back to their respective resting positions.

8.4.2 Calibrating the Null (Zero) Value (internal sensor)

Step 1:

Attach regulator to cylinder of zero air, insert calibration adapter into the sensor opening in the front of the enclosure door, and open regulator valve fully allowing zero air to ow over sensor. Use a slight twisting motion as you gently push the calibration adapter into the sensor opening. If the calibration adapter is hard to insert, moisten the O-ring seal slightly then try re-inserting it.

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Step 2:

Move jumper on J6 to position-2 and move jumper on J7 to position-3. The audible alarm beeps once for conrmation. The system is now starting the zero calibration stabilization time (30-seconds).

Step 3:

Attach digital multi-meter leads to test points TP-1 and TP-2. Reference Section 8 Calibration. The voltage should be 0.0 VDC. If the audible sounds with repetitive beeps, see Section 8.8 Forcing Calibration. The audible will beep twice when the calibration begins. Leave the zero air owing over the sensor until the GEM audible beeps three times indicating the procedure is nished (1-minute).

Step 4:

Move jumpers from J6 & J7 back to their respective resting positions and remove the zero air or Nitrogen.

8.4.3 Calibrating the Span Gas (internal sensor)

Step 1:

Attach regulator to cylinder of span gas.

Step 2:

Insert the calibration adapter into the sensor opening in the front of the enclosure door. Open regulator valve fully and allow span gas to ow over sensor.

Step 3:

Move the jumper on J6 to position-2 and move jumper on J7 to position-4. The audible alarm “beeps” once for conrmation. The system is now starting the span calibration stabilization time (30 seconds).

Step 4:

Attach digital multi-meter leads to test points TP-1 and TP-2. Monitor the voltage. It should start moving towards the voltage calculated for the span gas value (reference Section 8.3 Calibration Procedure).

If the audible sounds with repetitive beeps, see Section 8.8 Forcing Calibration. The audible will beep twice when the calibration begins. Leave the span gas owing over the sensor until the GEM audible beeps three times indicating the procedure is nished (2-minutes).

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Step 5:

Move jumpers from J6 & J7 back to their respective resting positions and remove the span gas.

8.5 Calibrating Second Internal Sensor

Calibration of the second internal sensor has only one dierence from the rst internal sensor calibration. Move the jumper from J6 to position-3 then follow the same procedure as outlined

in Section 8.4.1 to 8.4.3 using J6 position-3.

8.6 Calibrating Remote Catalytic or Solid State Sensor

8.6.1 Setting Span Gas Value (remote catalytic or SS sensor)

Step 1:

Move jumper on J6 to position-3 and move jumper on J7 to position-2. Audible alarm beeps once for conrmation. The system is now waiting for the user to set the desired value.

Step 2:

Attach digital multi-meter leads to test points TP-1 and TP-2. Reference Section 8 Calibration.

Step 3:

Using the UP or DOWN push-buttons, achieve the calculated voltage on the digital multi-meter. Reference Section 8.3 Calibration Procedure.

Step 4:

Move jumpers from J6 & J7 back to their respective resting positions.

8.6.2 Calibrating the Null (Zero) Value (remote catalytic or SS sensor)

Step 1:

Attach regulator to cylinder of zero air, attach ow adapter and open regulator valve fully allowing zero air to ow over sensor. Use a slight twisting motion as you gently push the calibration adapter into the sensor opening. If the calibration adapter is hard to insert, moisten the O-ring seal slightly then try re-inserting it.

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Step 2:

Move jumper on J6 to position-3 and move jumper on J7 to position-3. The audible alarm beeps once for conrmation. The system is now starting the zero calibration stabilization time (30 seconds).

Step 3:

The audible will beep twice when the calibration begins. Leave the zero air owing over the sensor until the GEM audible beeps three times indicating the procedure is nished (1 minute).

Step 4:

Move jumpers from J6 & J7 back to their respective resting positions and remove the zero air or Nitrogen.

8.6.3 Calibrating the Span Gas (remote catalytic or SS sensor)

Step 1:

Attach regulator to cylinder of span gas.

Step 2:

Attach ow adapter and open regulator valve fully (xed ow regulators only) allowing span gas to ow over sensor.

Step 3:

Move the jumper on J6 to position-3 and move jumper on J7 to position-4. The audible alarm “beeps” once for conrmation. The system is now starting the span calibration stabilization time (30 seconds).

Step 4:

The audible will beep twice when the calibration begins. Leave the span gas owing over the sensor until the GEM audible beeps three times indicating the procedure is nished (2 minutes).

Move jumpers from J6 & J7 back to their respective resting positions and remove the span gas.

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8.7 Calibrating 4-20 mA for Incoming Analog Transmitter

NOTE: The GEM is congured at the factory and should not require this type of calibration unless it is not functioning properly. Specialized equipment is required; only perform these functions after consulting the factory. This NOTE applies to Sections 8.7.1 through 8.7.4.

To perform this function, you will require either an accurate current source able to generate a 4.0 mA and 12.0 mA current signal or a CETCI analog transmitter that can supply the correct current values.

8.7.1 Using a Current Source to Calibrate the Null

Step 1:

Connect current source to pin 10 and ground to pin-11. For zero calibration, set the current source to 4.0 mA. Move the jumper on J6 to position-3 and the jumper on J7 to position-3. The audible will beep once for conrmation. The system is now starting the zero calibration stabilization time (30 seconds).

Step 2:

Attach digital multi-meter leads to test points TP-1 and TP-2. Monitor the voltage. If the audible sounds with repetitive beeps, see Section 8.8 Forcing Calibration. The audible will beep twice when the calibration begins. The audible beeps three times indicating the procedure is nished (2 minutes).

Step 3:

Move jumpers from J6 & J7 back to their respective resting positions.

8.7.2 Using a Current Source to Calibrate the Span

Step 1:

Connect current source to pin 10 and ground to pin-11. For span calibration set the current source to 20.0 mA. Move the jumper on J6 to position-3 and the jumper on J7 to position-4. The audible will beep once for conrmation. The system is now starting the span calibration stabilization time (30 seconds).

Step 2:

Attach digital multi-meter leads to test points TP-1 and TP-2. Monitor the voltage. If the audible sounds with repetitive beeps. Reference Section 8.8 Forcing Calibration. The audible will beep

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twice when the calibration begins. The audible beeps three times indicating the procedure is nished (2 minutes).

Step 3:

Move jumpers from J6 & J7 back to their respective resting positions and remove the current source.

8.7.3 Using a CETCI Analog Transmitter to Calibrate the Null

Step 1: At the transmitter:

For zero calibration on the transmitter, move the jumper to position-2 and set the voltage at TP-1 and TP-2 for “0” volts DC. If transmitter has been calibrated, TP-1 and TP-2 should be reading “0” volts DC.

At the GEM:

Move the jumper from J6 to position-3 and the jumper from J7 to position-3 The audible will beep once for conrmation. The system is now starting the zero calibration stabilization time (30 seconds).

Step 2:

Attach digital multi-meter leads to test points TP-1 and TP-2. Monitor the voltage. It should start moving towards zero gas value “0”. Reference Section 8.3 Calibration Procedure. If the audible sounds with repetitive beeps. Reference Section 8.8 Forcing Calibration. The audible will beep twice when the calibration begins. The audible beeps three times indicating the procedure is nished (2 minutes).

Step 3:

Move jumpers from J6 & J7 back to their respective resting positions.

8.7.4 Using a CETCI Analog Transmitter to Calibrate the Span

Step 1: At the transmitter:

With the transmitter still connected, move the jumper to position-2 and set voltage at TP-1 and TP-2 for 2.00 VDC.

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At the GEM:

Move jumper from J6 to position-3 and the jumper from J7 to position-2. Using the UP and DOWN push-buttons, set the voltage to 2.00 VDC.

Step 2:

Now, move the jumper from J6 to position-3 and the jumper from J7 to position-4. The audible will beep once for conrmation. The system is now starting the span calibration stabilization time (30 seconds).

Step 3:

Attach digital multi-meter leads to test points TP-1 and TP-2. Monitor the voltage. If the audible sounds with repetitive beeps. Reference Section 8.8 Forcing Calibration. The audible will beep twice when the calibration begins. The audible beeps three times indicating the procedure is nished (2 minutes).

Step 4:

Move jumpers from J6 & J7 back to their respective resting positions and remove the transmitter.

8.8 Forcing Calibration

If during the calibration procedure the GEM starts to display underow or overow or the audible alarm starts to beep at a 1-second interval, the technician will need to determine if the GEM sensor is more than 30% out of calibration or if the incorrect gases or gas values have been applied. If the gases are conrmed to be correct the technician can override the automatic calibration and force the GEM to accept the new values. This procedure requires the technician to

press both the UP and DOWN push-buttons at the same time to cause the “forced calibration”.

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9 ACCESSORIES

9.1 Calibration Kit

Calibration kits and gases are available 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 overseas. Part number CET-715A-CK1.

9.2 Metal Protective Guard

The metal protective guard is heavy duty metal protective guard to help protect against abrasive damage, theft and vandalism to the transmitters. This is an added preventative in addition to the product enclosure.

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) Size 10.0” W x 9.5” H x 4.75” D (254 mm W x 241 mm H x 121 mm D)

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10 MAINTENANCE

The GEM series system requires virtually no maintenance other than regular calibration of the integral and / or remote sensors and ensuring that excess water or dust is not somehow entering the enclosure and physically damaging the circuit board or internal components.

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NOTES

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NOTES

Page 60

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

GEM20141003-E