Gas Transmitters
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The document provides specifications and features of various gas transmitters by Dwyer Instruments, Inc., including models for detecting carbon monoxide, nitrogen dioxide, and carbon dioxide. Each model offers unique calibration options, accurate sensor technology, and applications for environments like parking garages and boiler rooms. Additionally, it emphasizes the importance of obtaining written permission for any use of the company's material and trademarks.
Gas Transmitters
- 1. Gas Transmitters The materials included in this compilation are for the use of Dwyer Instruments, Inc. potential customers and current employees as a resource only. They may not be reproduced, published, or transmitted electronically for commercial purposes. Furthermore, the Company’s name, likeness, product names, and logos, included within these compilations may not be used without specific, written prior permission from Dwyer Instruments, Inc. ©Copyright 2014 Dwyer Instruments, Inc.
- 2. Overview GSTA – CO / NO2 Gas Transmitter CDT – CO2 Gas Transmitter CMT200 – CO Gas Transmitter
- 3. GSTA - Introduction Gas transmitter for detecting carbon monoxide or nitrogen dioxide Can be wall or duct mounted Comes with optional remote display and can be field calibrated Purchase by type of gas detected and mounting configuration
- 4. GSTA - Key Specifications Range: 0 to 50 PPM up to 0 to 500 PPM CO (Field Selectable) or 0 to 10 PPM NO2 Accuracy: 2% F.S. for CO; 3% F.S. for NO2 at Time of Calibration Universal Output: Field Selectable 0 to 5 VDC / 0 to 10 VDC / 4 to 20 mA Dip Switch Selection for Inverted Outputs and Zero Suppression
- 5. GSTA - Key Specifications Sensor Type: Industrial Grade Electrochemical Sensor Sensor life 3 to 5 years with recommended calibration check every 6 months Field replaceable Remote LCD Display Useful for calibration
- 6. GSTA - Sensor Technology Electrochemical Gas Sensor Oxidizes/reduces gas at electrodes to produce a current Output from the sensor is linearly proportional to the gas concentration Allows for precise measurement at low concentration Easier to calibrate
- 7. GSTA - Sensor Technology Gas enters sensor through capillary and passes through filter Gas undergoes reaction on contact with Electrode (푪푶 + 푯ퟐ푶 → 푪푶ퟐ + ퟐ푯+ + ퟐ풆−) CO2 diffuses into the air, hydrogen ions migrate to the electrolyte, and electrons generate charge on working electrode
- 8. GSTA - Sensor Technology Secondary oxidation reaction occurs (푶ퟐ + ퟒ푯+ + ퟒ풆− → ퟐ푯ퟐ푶) at the counter electrode Small current generated proportional to gas concentration Third electrode used is a electrical reference
- 9. GSTA - Features and Benefits Industrial grade electrochemical sensor Longer sensor life leads to less frequent sensor replacements Higher accuracy at lower concentrations allow sensors to require less frequent calibrations Field replaceable sensors Transmitters are replaced less frequently
- 10. GSTA - Features and Benefits Remote LCD display Building occupants do not see readings that they do not understand Lowers transmitter cost to customer by having one display for multiple transmitters Allows customer to know when sensor reaches end of life by displaying “Bad Sen”
- 11. GSTA - Features and Benefits Dip switch selectable range Reduces inventory by only needing one model for 0 to 200 PPM or 0 to 500 PPM CO Universal outputs Reduces inventory by only needing one model for 0 to 5 VDC, 0 to 10 VDC, 4 to 20 ma Works with majority of building management controllers
- 12. GSTA - Features and Benefits Push button calibration / range selection More precise calibration and quicker set up Removable terminal blocks Reduces installation time and cost Multiple knockouts on housing Reduces installation cost by allowing installer to run wire or conduit to nearest side of housing
- 13. GSTA – Future Additions GSTB communicating transmitter with BACnet and Modbus GSTC master controller Accepts multiple GSTB inputs Audible and visual alarm outputs Two relay outputs Communications Proof of fan operation indication
- 14. GSTA - Applications Underground parking garages Monitor the exhaust gases from automobiles Signal to building management system to operate exhaust fans and high gas level warning alarms 465 to 700 square meter coverage area
- 15. GSTA - Applications Loading docks Monitor the gas levels from fork lifts and trucks
- 16. GSTA - Applications Automobile service bays or new car dealerships Monitor the carbon monoxide from automobile exhaust Signal to building management system to operate exhaust fans and high gas level warning alarms
- 17. GSTA - Applications Boiler or mechanical rooms Monitor the combustion gases from gas fired boilers
- 18. CDT - Introduction Measures carbon dioxide concentration and temperature in an indoor environment Wall and duct mounts available Can order passive thermistor or RTD sensor for temperature output
- 19. CDT - Key Specifications Range: 0 to 2000 PPM or 0 to 5000 PPM Accuracy: +/- 3 % of reading +/- 40 PPM Output: Field Selectable 0 to 10(5) VDC / 4 to 20 mA for CO2 and Temperature Optional Passive Temperature Outputs via Separate Terminal Board for Wall Mount Optional Relay for CO2
- 20. CDT - Key Specifications Sensor Type: Non-Dispersive Infrared Single Beam Dual Wavelength Technology Self Corrects for Drift Due to Light Source Aging Field Calibration Using Calibration Kit (Dwyer Calibration Gas Tanks Available For Sale in Approved Countries)
- 21. CDT - NDIR Sensor Technology
- 22. CDT - NDIR Sensor Technology Single Beam – Single Wavelength Telaire, Sense Air (ACI, Greystone, Thermokon, and Veris use Telaire or Sense Air Sensor Modules) Single Light Source and Single Receiver with ABC Logic Self Calibration Advantages: Lowest Cost Solution Acceptable Accuracy For Most Applications Disadvantages: Can’t Calibrate Itself in Buildings Occupied 24hrs / day Additional Error from Logic 400 PPM Assumption
- 23. CDT - NDIR Sensor Technology Dual Beam – Single Wavelength E+E, Vulcain (Honeywell Owned), Siemens Two Light Sources and Single Receiver Using Second Light Source as Reference Advantages: Can Self Calibrate In Occupied Buildings Less Expensive Sensor Disadvantages: Doesn’t Account for Aging of Second Light Source
- 24. CDT - NDIR Sensor Technology Single Beam – Dual Wavelength Dwyer, Vaisala Single Light Source With Two Wavelength Filters Where One Filter Monitors the Light and Other Measures CO2 Advantage: Self Calibrates in Occupied Buildings Calibration Monitors Actual Light Aging Effect Disadvantage: Most Expensive Of Sensor Technologies
- 25. CDT - Features and Benefits Field Calibration with Jumper Lockout Allows Qualified Users to Adjust Calibration to Insure Most Accurate Sensor Possible Eliminates Building Occupants from Mistakenly Changing Calibration Field Selectable Outputs Eliminates Chance of Customer Ordering Incorrect Models Allows Transmitter to Work With Most BMS Controllers
- 26. CDT - Features and Benefits Terminal Block On Back Plate Customer Can Change Transmitter Without Requiring Electrician Back Plate Can Be Installed Without Risk of Transmitter Being Damaged or Lost During Rough In Local and Remote Display Allow Customer to Access Calibration and Set Up Menus Can be Configured Not to Display CO2 for Daily Use Same Remote Display for Whole BAS Wall Mount Family
- 27. CDT - Features and Benefits On Board RTD Temperature Sensor Able to View Ambient Temperature on All Models Large Vents in Housing Along With Placement of Sensor, Creates More Air Flow Across Sensor For Greater Accuracy Optional Relay Can Turn On Fan In Case CO2 Level Too High Field Selectable Engineering Units Universal Product Platform for US and Overseas Customers
- 28. CDT - Features and Benefits Barometric Pressure Compensation Allows Users Above Sea Level to Correct For Barometric Pressure to Insure Most Accurate Reading Output Scaling Allows Users to Achieve Greater Resolution by Using a More Custom Temperature and CO2 Range Push Button Calibration Reduces Time it Takes to Calibrate Transmitters Low Price (Starting at $175.00 List) Allows Customers to Bid More Competitively on Projects
- 29. CDT - Applications Carbon Dioxide Transmitters are used as an indication of the level of occupancy in a multiuse room such as a conference room
- 30. CDT - Application Carbon Dioxide Transmitters are commonly used in schools to insure enough fresh air is being supplied to the classrooms
- 31. GSTA Introduction Gas transmitter for detecting carbon monoxide or nitrogen dioxide Can be wall or duct mounted Comes with optional remote display and can be field calibrated Purchase by type of gas detected and mounting configuration
- 32. Key Specifications Range: 0 to 50 PPM up to 0 to 500 PPM CO (Field Selectable) or 0 to 10 PPM NO2 Accuracy: 2% F.S. for CO; 3% F.S. for NO2 at Time of Calibration Universal Output: Field Selectable 0 to 5 VDC / 0 to 10 VDC / 4 to 20 mA Dip Switch Selection for Inverted Outputs and Zero Suppression
- 33. Key Specifications Sensor Type: Industrial Grade Electrochemical Sensor Sensor life 3 to 5 years with recommended calibration check every 6 months Field replaceable Remote LCD Display Useful for calibration
- 34. Sensor Technology Electrochemical Gas Sensor Oxidizes/reduces gas at electrodes to produce a current Output from the sensor is linearly proportional to the gas concentration Allows for precise measurement at low concentration Easier to calibrate
- 35. Sensor Technology Gas enters sensor through capillary and passes through filter Gas undergoes reaction on contact with Electrode (푪푶 + 푯ퟐ푶 → 푪푶ퟐ + ퟐ푯+ + ퟐ풆−) CO2 diffuses into the air, hydrogen ions migrate to the electrolyte, and electrons generate charge on working electrode
- 36. Sensor Technology Secondary oxidation reaction occurs (푶ퟐ + ퟒ푯+ + ퟒ풆− → ퟐ푯ퟐ푶) at the counter electrode Small current generated proportional to gas concentration Third electrode used is a electrical reference
- 37. Features and Benefits Industrial grade electrochemical sensor Longer sensor life leads to less frequent sensor replacements Higher accuracy at lower concentrations allow sensors to require less frequent calibrations Field replaceable sensors Transmitters are replaced less frequently
- 38. Features and Benefits Remote LCD display Building occupants do not see readings that they do not understand Lowers transmitter cost to customer by having one display for multiple transmitters Allows customer to know when sensor reaches end of life by displaying “Bad Sen”
- 39. Features and Benefits Dip switch selectable range Reduces inventory by only needing one model for 0 to 200 PPM or 0 to 500 PPM CO Universal outputs Reduces inventory by only needing one model for 0 to 5 VDC, 0 to 10 VDC, 4 to 20 ma Works with majority of building management controllers
- 40. Features and Benefits Push button calibration / range selection More precise calibration and quicker set up Removable terminal blocks Reduces installation time and cost Multiple knockouts on housing Reduces installation cost by allowing installer to run wire or conduit to nearest side of housing
- 41. GSTA Applications Underground parking garages Monitor the exhaust gases from automobiles Signal to building management system to operate exhaust fans and high gas level warning alarms 465 to 700 square meter coverage area
- 42. GSTA Applications Loading docks Monitor the gas levels from fork lifts and trucks
- 43. GSTA Applications Automobile service bays or new car dealerships Monitor the carbon monoxide from automobile exhaust Signal to building management system to operate exhaust fans and high gas level warning alarms
- 44. GSTA Applications Boiler or mechanical rooms Monitor the combustion gases from gas fired boilers
- 45. GSTA Future Product Additions GSTB communicating transmitter with BACnet and Modbus GSTC master controller Accepts multiple GSTB inputs Audible and visual alarm outputs Two relay outputs Communications Proof of fan operation indication
- 46. CMT200 - Introduction Carbon Monoxide Transmitter Field calibratable and field replaceable sensors that are accurate for up to 4 years Field selectable current/voltage outputs Pricing: Starts at $120.00 list
- 47. CMT200 - Key Specifications Sensor: Field replaceable electrochemical, 4 year typical lifespan Range: 0 to 200 ppm Accuracy: ±2% of reading at the time of calibration Housing: UV resistant polycarbonate Output: Jumper selectable 4 to 20 mA (loop powered) or 2 to 10 V (load must be >50 KΩ) Agency Approvals: CE, RoHS
- 48. CMT200 - Electrochemical Gas Sensor Oxidizes/reduces gas at electrodes to produce a current Output from the sensor is linearly proportional to the gas concentration Allows for precise measurement at low concentration Easier to calibrate
- 49. CMT200 - Advantages Benefits of the electrochemical gas sensor Linear and highly accurate output Requires minimal power Has a long lifetime
- 50. CMT200 - Advantages Sensor can be field calibrated and is field replaceable Can provide up to 4 years of accurate readings with regular calibration Calibration can be done by using Model GCK- 200CO-2000CO2 calibration gas, Model A-507A calibration adapter, and the on board span and zero potentiometers
- 51. CMT200 - Applications Carbon monoxide is a toxic gas that is colorless, odorless, tasteless and difficult for people to detect Most commonly a byproduct of combustion in low oxygen environment Motor vehicles Heaters and cooking equipment that run on carbon-based fuels Dangerous at concentrations of 100 ppm or more
- 52. CMT200 - Applications Used in: Underground or indoor parking areas, where vehicle exhaust can lead to an accumulation of CO gas Vehicle maintenance facilities Mechanical rooms Covers 5000 to 7000 sq. ft.