User Manual - Calibration Technologies
Contents
1. 66 394 5861 GasGuardian EM Operating and Installation Manual General Description Powered by 24VDC the GasGuardian Entrance Monitor terminates the gas sensor s 4 20 mA signal and re transmits the 4 20 mA signal to another analog input device such as gas detection controller or plant PLC If no connection is made to the signal output terminal the unit will act as a stand alone device Multiple units can be installed in series providing flexible remote viewing options The GasGuardian EM is assembled into a wall mounted enclosure designed for non classified locations The gas sensor not included is installed at the location where gas is to be detected up to 1 500 feet from the readout via a three conductor cable The GasGuardian EM provides continuous real time monitoring of the sensor Gas concentrations are indicated by the 10 segment LED bargraph display The status LED provides an at a glance status of power including an alarm or fault condition A calibration mode setting allows for sensor maintenance and calibration without tripping the relay The onboard relay has a 10 second on off time delay to prevent unnecessary cycling during a fault or alarm condition The alarm setpoint is adjusted by a ten position rotary switch on the display board An optional add on power supply is also available to allow for 120VAC operation 4 Installation Locating the GasGuardian EM The important consideration when installin2. ARISING FROM BREACH OF WARRANTY OR BASED ON CONTRACT TORT OR RELIANCE OR ANY OTHER THEORY 13 GG EM 01 2014
3. GASGUARDIAN EM _ Entrance Monitor ALIBRAT ECHNOLOG AES 1000 NH3 800 PPM 600 400 200 25 He 20 LEL 15 10 5 100 NH3 80 LEL 60 40 20 1000 R404a Se PPM 600 400 200 3000 R134a 2400 PPM 1800 1200 600 200 co 160 PPM 120 80 40 3000 R404a 200 1800 1200 600 1000 410 500 600 400 200 1000 R22 800 PPM 600 400 200 3000 R22 2400 PPM 1800 1200 600 2000 H2 1600 PPM 1200 800 400 100 80 LEL 60 40 20 Sensor range labels included with unit 3000 R507a 2400 PPM 1800 1200 600 100 100 80 80 CHa H2 LEL 60 LEL 60 40 40 20 20 GasGuardian EM Operating and Instruction Manual Table of Contents General description 4 Installation 0 e eee etree eee eee 4 Operation ae e Sensor range Start up coe ltr Alarm setpoint esses Relay Alarm Calibration Oxygen downscale alarm mode Status ee Signal voltage testpoints Specifications ecc irse s Optional power Warranty cerne iE en Calibration Technologies 8
4. g GasGuardian EM readout is that it must be easily accessible for operating personnel Installation Guidelines e Mount readout on a solid surface with minimal vibration e Mount readout in a general purpose location only Do not install in a hazardous environment e Mount readout away from electromagnetic interference e Protect readout from physical damage 4 0 GasGuaRDiAN EM mo PPM uses 5 8 Figure 1 Dimensions GasGuardian EM Operating and Instruction Manual Wiring Electrical wiring must comply with all applicable codes Wiring Guidelines e Always use three conductor insulated stranded shielded copper cable for all sensor cables e Do not pull sensor wiring with AC power cables This can cause electrical interference e Be sure to land the shield conductors of the sensor cables at the shield terminals of the sensor connectors e Bonding between metallic conduit connections is not automatic with the non conductive enclosure Separate bonding must be provided DC Power e Requires 24VDC 125 mA not including other connected devices Sensor Wiring 4 20 mA 100 Ohm input impedance e Refer to sensor manual for cable recommendations e Typically 20 3 shielded cable Belden 8772 or equivalent e Length of cable should not exceed 1 500 feet Relay Wiring e AC wiring must be run in separate conduit from the sensor cables separate relay cable conduit hole i
5. his warranty does not include a routine replacement of parts due to the normal wear and tear of the product arising from use b any product which in CTI s opinion has been misused altered neglected or damaged by accident or abnormal conditions of operation handling or use c any damage or defects attributable to repair of the product by any person other than an authorized dealer or contractor or the installation of unapproved parts on the product The obligations set forth in this warranty are conditional on 8 proper storage installation calibration use maintenance and compliance with the product manual instructions and any other applicable recommendations of CTI b the buyer promptly notifying CTI of any defect and if required promptly making the product available for correction No goods shall be returned to CTI until receipt by the buyer of shipping instructions from CTI and c the right of CTI to require that the buyer provide proof of purchase such as the original invoice bill of sale or packing slip to establish that the product is within the warranty period THE BUYER AGREES THAT THIS WARRANTY IS THE BUYER S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE CTI SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES INCLUDING LOSS OF DATA WHETHER
6. nd analog output wiring Visual Status Indications 1 Yellow 10 segment LED bargraph gas concentration display 1 Green power LED 1 Red alarm LED 1 Red fault LED 1 Green relay status LED GasGuardian EM Operating and Installation Manual Optional Power Suppl The GasGuardian EM is available with an optional AC to DC power supply which mounts inside of the enclosure This supply can be used for stand alone applications where only 120 VAC power is available and or external devices horns strobes exhaust fans etc will be activated via the onboard relay of the GasGuardian EM Order number GG EM PS Specifications Output 24 VDC 0 625 A Overload short circuit and thermal protection Washdown and weatherproof with proper conduit fittings Limited Warranty amp Limitation of Liability Calibration Technologies Inc CTI warrants this product to be free from defects in material and workmanship under normal use and service for a period of one year beginning on the date of shipment to the buyer This warranty extends only to the sale of new and unused products to the original buyer CTI s warranty obligation is limited at CTI s option to refund of the purchase price repair or replacement of a defective product that is returned to a CTI authorized service center within the warranty period In no event shall CTI s liability hereunder exceed the purchase price actually paid by the buyer for the Product T
7. oxygen level monitoring To activate downscale alarm mode slide the O2 switch to the on position Status LED s The GasGuardian EM is equipped with the following status LEDs Gas Concentration Bargraph The 10 segment yellow LED bargraph will display the gas concentration in 10 increments Use the tick marks on the full scale range label to the left of the display to determine the concentration Power The green power LED will remain on solid to indicate power Alarm The red alarm LED will flash once per second during an alarm condition Fault The red fault will light and remain on solid in the event of a sensor fault condition Since the GasGuardian EM is constantly monitoring the sensor signal any signal below 1 mA will be considered a sensor fault Relay Status see page 10 for LED location The green relay LED will remain on solid in the clear position during normal operation Signal Voltage Testpoints There are two sets of signal testpoints for signal verification and troubleshooting purposes These signals are measured in mVDC and range from 40 to 200 mV The SIG IN testpoints indicate the 4 20 mA signal coming from the sensor The SIG OUT testpoints indicate the 4 20 mA signal being re transmitted to another control panel or PLC if used as a feed through device GasGuardian EM Operating and Installation Manual Relay status LED 40 200 mV mVDC Black Red YOSNIS OL YITIOYINO9 OL Ala
8. propriate alarm functions Alarm Setpoint The GasGuardian EM is has one adjustable alarm setpoint The 10 position rotary switch allows for alarm setpoint adjustments in 10 increments Once the sensor signal has exceeded the alarm setpoint the alarm LED will light immediately and the alarm relay will set after a 10 second time delay Once the signal has decreased lower than the alarm setpoint the relay will clear after a 10 second time delay Relay Alarm Test The relay test function allows for testing of the relay output function without gassing the sensor To test the relay put unit into calibration mode see below and turn the 10 position rotary switch to the 0 setting After the short time delay the relay will set into the alarm condition To clear the relay adjust the setpoint to the intended alarm position Calibration Mode Calibration mode allows for sensor calibration and maintenance without causing external alarm conditions To activate calibration mode slide the Cal switch to the on position To deactivate slide switch to off position In calibration mode the following conditions apply 1 The green power LED will flash twice per second 2 The relay will remain locked in the clear non alarm condition 3 The analog output will remain locked at 4 mA GasGuardian EM Operating and Instruction Manual Oxygen Downscale Alarm Mode The oxygen downscale mode provides downscale alarming for
9. rm setpoint adjust 1 SIG Oxygen downscale switch gt Fe O Calibration mode switch Figure 4 Components and Operation 10 GasGuardian EM Operating and Instruction Manual Maintenance All gas detection systems should be calibrated with certified calibration gas once every six months At this interval all alarm functions and outputs should be tested verified and documented If sensor span or zero cannot be adjusted refer to the sensor manual The sensor may be approaching its end of life and may need to be replaced Keep an operation log of all maintenance calibrations and alarm events To clean the controller use a mild cleaning solution and soft cloth Specifications Power Requirements 24 VDC 125 mA not including other connected devices Dimensions 6 2 high x 4 wide x 3 deep Weight 1 Ib Enclosure Injection molded NEMA 4X polycarbonate gasketed housing Hinged lid with 2 latching clasps For non classified areas Rated for outdoors and washdown locations Anodized aluminum mounting plate Temperature Range 40 F to 122 F Humidity Range 0 to 100 condensing Sensor Inputs 1 4 20 mA 100 Ohm input impedance Analog Output 4 20 mA max input impedance 700 Ohms Relay Outputs 1 SPDT relay 10A 24 VDC or 120 VAC Dry contacts Wiring Connections 3 conductor shielded stranded 20 AWG cable Belden 8772 or equivalent up to 1500 ft for sensor a
10. s needed do not drill or punch hole on hinge side of enclosure due to close proximity of cable connectors e The alarm relay has Form C dry contacts and is rated 10 Amps 110 VAC or 24 VDC dry contacts require external power connection e The alarm relay is normally energized It will de energize to the alarm state upon sensor alarm fault or loss of power e The alarm relay has a status LED to show the state of the relay During normal operation the green status LED is on indicating the relay is energized Stand Alone and Feed Through Applications The GasGuardian EM terminates the gas sensor s 4 20 mA signal and re transmits the 4 20 mA signal to another analog input device such as gas detection controller or plant PLC If no connection is made to the signal output terminal the unit will act as a stand alone device Feed through application wiring specifications e Maximum input impedance 700 Ohms e Cable recommendations 20 3 shielded cable Belden 8772 or equivalent e Length of cable should not exceed 1 500 feet GasGuardian EM Operating and Installation Manual to alarm device or relay monitoring input to Shield terminal of sensor to Ground terminal of sensor to 24V terminal of sensor MOSN3S OL to Signal terminal of sensor to Ground terminal of power supply to 24V terminal of power supply o 2 E m a Figure 2 Wiring Diagram Stand Alone application GasG
11. uardian EM Operating and Instruction Manual to alarm device or relay monitoring input to Shield terminal of sensor to Ground terminal of sensor to 24V terminal of sensor YOSN3S OL to Signal terminal of sensor to case ground of monitoring equipment to Ground terminal of power supply to 24V terminal of power supply OL to Signal input of monitoring equipment Figure 3 Wiring Diagram Feed Through application GasGuardian EM Operating and Installation Manual Sensor Range Label The GasGuardian EM is shipped with various range labels If the range of the sensor is not the default range of 0 100 ppm select the proper range label and affix it over the default label Start up Before applying power make a final check of all wiring for continuity shorts grounds etc It is usually best to disconnect external alarms and other equipment from the GasGuardian EM until the initial start up procedures are completed Refer to sensor manual for proper warm up time of sensor prior to any sensor test Because sensors are normally located at a distance from the main unit the test time required and accuracy of the response checks will be improved if two people perform the start up procedures and use radio contact Start Up Test 1 One person exposes the sensor to calibration or test gas 2 The second person stays at the control unit to determine that the sensor when exposed to the gas causes ap
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