Dwyer GSTA Series Gas Sensing Transmitters Owner’s Manual

: June 10, 2024
: Dwyer

Table of Contents

SPECIFICATIONS
References
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Dwyer GSTA Series Gas Sensing Transmitters Owner’s Manual

Wall mount with LCD
Wall mount without LCD
Duct mount

DIMENSION

The Series GSTA & GSTC Carbon Monoxide/Nitrogen Dioxide Gas Transmittersmonitor gas concentrations in mechanical rooms, underground parking garages andloading 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| None
GSTA-C-LCD| CO| Universal current/voltage| Wall| LCD
GSTA-N| NO2| Universal current/voltage| Wall| None
GSTA-N-D| NO2| Universal current/voltage| Duct| None
GSTA-N-LCD| NO2| Universal current/voltage| Wall| LCD
GSTC-C| CO| BACnet and Modbus®| Wall| None
GSTC-C-D| CO| BACnet and Modbus®| Duct| None
GSTC-C-LCD| CO| BACnet and Modbus®| Wall| LCD
GSTC-N| NO2| BACnet and Modbus®| Wall| None
GSTC-N-D| NO2| BACnet and Modbus®| Duct| None
GSTC-N-LCD| NO2| BACnet and Modbus®| Wall| LCD
ACCESSORIES

A-GSTA-SE
GCK-200CO-2000CO2
A-449
A-505
A-506
A-507

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.