Dwyer GSTA and GSTC Series Carbon Monoxide/ Nitrogen Dioxide Gas Transmitters Instructions
- June 3, 2024
- Dwyer
Table of Contents
Dwyer GSTA and GSTC Series Carbon Monoxide/ Nitrogen Dioxide Gas
Transmitters Instructions
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.
PRODUCT DIMENSION
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| Description
GSTA-C| Carbon monoxide transmitter with universal current/voltage outputs
GSTA-N| Nitrogen dioxide transmitter with universal current/voltage outputs
GSTA-C-LCD| Carbon monoxie transmitter with universal current/voltage outputs,
LCD display
GSTA-N-LCD| Nitrogen dioxide transmitter with universal current/voltage
outputs, LCD display
GSTA-C-D| Nitrogen dioxide duct mount transmitter with universal current/
voltage outputs
GSTC-C| Carbon monoxide transmitter with BACnet and Modbus® communication
GSTC-N| Nitrogen dioxide transmitter with BACnet and Modbus® communication
GSTC-C-LCD| Carbon monoxide transmitter with BACnet and Modbus® communication
with integral LCD display
GSTC-N-LCD| Nitrogen dioxide transmitter with BACnet and Modbus® communication
with integral LCD display
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 |
SPECIFICATIONS
- Sensor: Field replaceable electrochemical, 4 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).
- Agency Approvals: CE.
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>