CTI GG-CO2 User Manual
Contents
1. GASGUARD CO Carbon Dioxide Sensor ALIB INC GasGuard CO2 Operating and Instruction Manual Table of Contents General description 4 Installation es teet re t pret bet 4 Locating the Sensor 4 Installation guidelines 5 us aad et 6 Operation 1 er neath eire 7 ac tiene ried we as 7 Calibration reri 7 M intenance retirees tee eon 9 10 Warrant 11 Calibration Technologies 866 394 5861 GasGuard CO2 Operating and Installation Manual General Description The GasGuard 2 sensor is a 24 VDC three wire 4 20 mA sensor for carbon dioxide which utilizes proven infrared sensor technology for accurate and reliable leak detection The 0 3 0 30 000ppm detection range of the GasGuard CO2 provides real time continuous monitoring of ambient carbon dioxide concentrations 0 196 and 0 5 ranges are also available The GasGuard CO2 provides an industry standard linear 4 20 mA output signal compatible with most gas detection systems and PLCs The output signal is not affected by drastic temperature and moisture variations that occur during washdown defrost cycles etc The circuit board is forever sealed in potting compound completely protecting se2. made without a splice all splice connections should be soldered Ground the shield at the main control panel Connect the shield wire in the sensor terminal block labeled SHLD Use only the existing conduit hole for connections to the sensor Figure 2 Wiring diagram GasGuard CO2 Operating and Instruction Manual Start up Before applying power make a final check of all wiring for continuity shorts grounds etc After power up allow at least 2 hours for the system to stabilize before testing the sensors 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 each sensor to calibration gas breathing on the sensor can also produce a significant signal rise 2 The second person stays at the control unit to determine that each sensor when exposed to carbon dioxide is connected to the proper input and responds causing appropriate alarm functions Calibration The GasGuard CO2 Sensor comes factory calibrated and should require only minimal adjustments after installation There are two pots on the preamp that are used for calibration Note Never measure sensor output in mA Always use mVDC or VDC voltmeter settings Zero Calibration After the unit is installed and has been powered up for a minimum of 2 hours the
3. e installation of unapproved parts on the product The obligations set forth in this warranty are conditional on 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 ARISING FROM BREACH OF WARRANTY OR BASED ON CONTRACT TORT OR RELIANCE OR ANY OTHER THEORY 11 GG CO2 02 2013 SPECIALISTS IN Gas Derecrion
4. hipped with a factory calibration Sensor should be calibrated 6 months from purchase date Calibrate the detector at least once every 6 months Calibration should be performed with certified calibration gas Calibration kits and replacement cylinders are available from Calibration Technologies All tests and calibrations must be logged Sensor Life Typical sensor life of the GasGuard CO2 is five to seven years Failure of the infrared sensor happens normally when the infrared source opens or breaks similar to an incandescent light bulb filament If this occurs the sensor will produce a continuous fault indication signal of 0 5 mA and the fault LED will be lit Contact Calibration Technologies for a sensor replacement GasGuard Operating and Installation Manual Specifications Detection Principle Infrared Detection Method Diffusion Gases Carbon dioxide CO2 Ranges 0 1 0 10 000ppm 0 3 0 30 000ppm standard range 0 5 0 50 000ppm Output Signal Linear 4 20 mA max input impedance 700 Ohms Power Supply 24 VDC 350 mA Response Time Tso less than 30 seconds less than 60 seconds Accuracy 5 of value but dependent on calibration gas accuracy Zero Drift Less than 0 5 of full scale per month non cumulative Span Drift Less than 1 per month non cumulative Linearity 0 5 of full scale Repeatability 1 of full scale Wiring Connections 3 conduct
5. nsitive electronic components and copper tracing from corrosion The specially vented chemical resistant polycarbonate enclosure protects the sensor from accidental damage weather and direct hose hits from cleaning crews Installation Locating the sensor One of the most important considerations when installing GasGuard CO2 sensors is that they must be easily accessible for calibration and maintenance For optimum personnel protection representative concentration reading that an employee would be exposed to mount the sensor at a height in the breathing zone of the employees It would typically be about five feet off the ground which also allows easy access As a general rule of thumb try to mount sensors within 30 feet of potential leak sources GasGuard CO2 Operating and Instruction Manual Installation Guidelines Always mount the sensor vertically Must be easily accessible for calibration and maintenance Mount the sensor close to the potential leak source For optimum personnel protection mount sensor in the breathing zone 4 5 above floor Take air movement and ventilation patterns into account To prevent electrical interference keep sensor and wire runs away from mercury vapor lights variable speed drives and radio repeaters Protect sensor from physical damage forklifts etc If mounting sensor outdoors consider prevailing wind direction and proximity to the most likely source of leaks Pro
6. or shielded stranded 20 AWG cable General Cable C2525A or equivalent up to 1500 ft Enclosure Injection molded NEMA 4X polycarbonate sensor housing Captive screw in hinged lid For non classified areas Temperature Range 60 F to 120 F 51 C to 49 C Humidity Range 590 to 10096 condensing Dimensions 7 5 high x 6 5 wide x 3 8 deep Weight 2 lbs 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 This warranty does not include routine replacement of parts due to the normal wear and tear of the product arising from use b any product which in 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 th
7. tect the sensor from sun and rain as much as possible Mount sensor enclosures through the mounting holes as shown in Figure 1 Use the supplied self tapping screws for mounting on sheet metal surfaces Even though the sensor comes from the factory calibrated it is always a good idea to calibrate the sensor to the environment in which it is installed This will compensate for any inaccuracies caused by a change is temperature altitude etc 6 5 20 n GasGuanp CARBON DIOXIDE SENSOR es Figure 1 Mounting dimensions GasGuard CO2 Operating and Installation Manual Wiring Electrical wiring must comply with all applicable codes Electrical Power 24 VDC regulated 350 mA Output Linear 4 20 mA output Monitoring equipment may have a maximum input impedance of 700 ohms Cable Recommendation 20 3 shielded cable General Cable C2525A or equivalent Length of cable to sensor should be no greater than 1 500 feet Monitoring Monitoring equipment must be configured to indicate a fault if the signal is below 1 mA All signals over 20 mA must be considered high gas concentrations Alarm setpoints should not be lower than 1090 of full scale range Wiring Guidelines GASGUARD CO Always use three conductor insulated stranded shielded copper cable Do not pull sensor wiring with AC power cables This can cause electrical interference If cable runs cannot be
8. unit can be zero calibrated by the following Apply Zero Air gas or nitrogen at 0 8 L min e Adjust the zero pot until the sensor outputs 40 mVDC from test points to see Figure 3 Span Calibration DO NOT ADJUST THE SPAN POT WITHOUT CERTIFIED CALIBRATION GAS If span adjustment is required the following procedure will span the unit e Perform zero calibration prior to spanning Connect tubing to the calibration port of the infrared tube see Figure 3 Apply span gas at 0 8 L min e Sensor should react to gas within 10 seconds Once the output signal has peaked or two minutes maximum adjust the span pot until the correct output is achieved Note The adjustment response is dampened Make slight adjustments no more than 72 turn of the potentiometer and wait for output response If the correct output cannot be achieved contact Calibration Technologies for technical help GasGuard CO2 Operating and Installation Manual Zero and Span adjustments Eis Inc 866 394 5861 GASGUARD Figure 3 Sensor output and zero span adjustments GasGuard CO2 Operating and Instruction Manual Maintenance The GasGuard 2 was designed for long life and minimal maintenance For proper operation it is essential that the test and calibration schedule be adhered to Calibration Technologies recommends the following maintenance schedule Maintenance Guidelines e The sensor is s
Download Pdf Manuals
Related Search