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Owner's Manual for Dwyer models including: GSTA-C, GSTA Series Gas Sensing Transmitters, Gas Sensing Transmitters, Sensing Transmitters, Transmitters, GSTA-C-D, GSTA-C-LCD, GSTA-N, GSTA-N-D, GSTA-N-LCD, GSTC-C, GSTC-N
Series GSTA Carbon Monoxide/Nitrogen Dioxide Transmitters
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DocumentDocumentAIR QUALITY SERIES GSTA & GSTC CARBON MONOXIDE/NITROGEN DIOXIDE GAS TRANSMITTERS High Accuracy Electrochemical Sensor, Universal Output or BACnet or Modbus® Communication Protocol Options YEAR LIMITED WARRANTY Gas Sensing Transmitters Wall mount with LCD 3-45/64 [94.06] 3-1/8 [107.95] 2-15/64 [56.75] 3-23/64 [85] 2-55/64 [73] 2-15/64 [57] VIDEO ON LINE Wall mount without LCD Duct mount The Series GSTA & GSTC Carbon Monoxide/Nitrogen Dioxide Gas Transmitters monitor gas concentrations in mechanical rooms, underground parking garages and loading docks. The carbon monoxide transmitter is used to measure the exhaust of gasoline engines, while the nitrogen dioxide transmitter is used for diesel engines. The Series GSTA features field selectable current and voltage outputs while the Series GSTC features BACnet or Modbus® communication protocol, allowing gas sensing solutions that can be used with almost any building management controller. BENEFITS/FEATURES · Easy field maintenance with industrial grade replaceable sensors · Reduced inventory of units with field selectable outputs · Simplified setup for non-LCD units using the set-up display tool APPLICATIONS · Garage or loading dock ventilation · Mechanical room monitoring MODEL CHART Model Gas Output Mount Display GSTA-C CO Universal current/voltage Wall None GSTA-C-D CO Universal current/voltage Duct GSTA-C-LCD CO Universal current/voltage Wall GSTA-N NO2 Universal current/voltage Wall GSTA-N-D NO2 Universal current/voltage Duct GSTA-N-LCD NO2 Universal current/voltage Wall GSTC-C CO BACnet and Modbus® Wall GSTC-C-D CO BACnet and Modbus® Duct GSTC-C-LCD CO BACnet and Modbus® Wall GSTC-N NO2 BACnet and Modbus® Wall GSTC-N-D NO2 BACnet and Modbus® Duct GSTC-N-LCD NO2 BACnet and Modbus® Wall None LCD None None LCD None None LCD None None LCD 4-17/32 [115.09] 5-7/64 [129.78] Wall mount 3-59/64 [100] Duct mount SPECIFICATIONS Sensor: Field replaceable electrochemical, 2 years typical lifespan. Range: NO2: 10 PPM; GSTA CO: Switch selectable 200 or 500 PPM; GSTC CO: 500 PPM. Output Drift: <5% per year in air. Coverage Area: 5000 to 7500 sq ft typical. Accuracy: CO: 2% FS, NO2: 3% FS, at the time of calibration. Resolution: CO: 1 PPM; NO2: 0.1 PPM. Temperature Limits: -4 to 122°F (-20 to 50°C). Storage Temperature: For best sensor life, 32 to 68°F (0 to 20°C). Humidity Limits: 15 to 90% RH constant; 0 to 99% RH intermittent. Response Time: <45 s to 90% CO, <25 s to 90% NO2. Span and Zero Adjustment: Via onboard push-buttons or using optional A-449 display; GSTC models: Zero only via BACnet or Modbus® communication protocol. Housing: UV resistant glass filled polycarbonate. Output Signals: GSTA: Switch selectable 4-20 mA (loop powered), 0-5 V @ 5 mA, or 0-10 V @ 5 mA; Switch selectable 0-5 V/1-5 V and 0-10 V/2-10 V; Switch selectable normal or reverse output; GSTC: BACnet MS/TP, Modbus® RTU, or Modbus® ASCII (switch selectable) communication protocol. Power Requirements: GSTA: Current output: 10-35 VDC, Voltage output: 15-35 VDC or 15-29 VAC; GSTC: 10-36 VDC or isolated 21.6-33 VAC, 5.7 mA @ 24 VDC. Electrical Connection: Removable terminal block, knockouts for conduit fitting. Calibration: Via onboard push-buttons (LCD model only) or using optional A-449 display. Span gas concentration is field selectable. Enclosure Rating: IP64. Weight: 1 lb (0.45 kg). Compliance: CE. ACCESSORIES Model Description A-449 Remote LCD display A-505 CO replacement sensor A-506 NO2 replacement sensor A-507 Calibration adaptor A-GSTA-SE Security enclosure GCK-200CO-2000CO2 Calibration gas A-GSTA-SE GCK-200CO-2000CO2 A-449 A-505 A-506 A-507 Modbus® is a registered trademark of Schneider Electric USA, Inc. DWYER INSTRUMENTS, LLC | dwyer-inst.com 231