Dwyer Instruments GSTA, GSTC Specifications
SERIES GSTA & GSTC | CARBON MONOXIDE/NITROGEN DIOXIDE GAS TRANSMITTER
Sensor
Output Drift
Accuracy
Temperature Limits
Humidity Limits
Span and Zero Adjustments
Housing
Output
Power Supply
Weight
Agency Approvals
FEATURES/BENEFITS
• Industrial grade electrochemical sensor means longer sensor life and less
frequent sensor replacements
• Field replaceable sensors extend transmitter’s working life
• Remote LCD display makes select models more cost effective by only needing
one display for multiple transmitters
• Field selectable current and voltage outputs on GSTA and BACnet or MODBUS
communication protocol on GSTC allow for gas sensing solutions to be used with
almost any building management controller
®
APPLICATIONS
• Parking garages
• Loading docks
• Automobile service bays
• Boiler or mechanical rooms
DESCRIPTION
The SERIES GSTA AND GSTC Carbon Monoxide/Nitrogen Dioxide Transmitters monitor gas
concentration in 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 has field selectable current and voltage
output, and the Series GSTC is compatible with either BACnet or MODBUS® communication
protocol, allowing the transmitters to be used with almost any building management controller.
To maximize the accuracy of the transmitters, the sensors can be field-calibrated using the
A-449 remote LCD display. When the sensor reaches the end of its life, the display will indicate
that the sensor needs to be replaced.
SPECIFICATIONS
Field replaceable electrochemical, 4 years typical lifespan.
NO2: 10 PPM; GSTA CO: Switch selectable 200 or 500 PPM; GSTC CO: 500 PPM.
Range
<5% per year in air.
Coverage Area
Resolution
Storage Temperature
Response Time
Electrical Connection
Calibration
5000 to 7500 ft2 typical.
CO: 2% FS; NO2: 3% FS, at the time of calibration.
CO: 1 PPM; NO2: 0.1 PPM.
-4 to 122°F (-20 to 50°C).
For best sensor life 32 to 68°F (0 to 20°C).
15 to 90% RH constant; 0 to 99% RH intermittent.
<45 seconds to 90% CO; <25 seconds to 90% NO2.
Via pushbutton, using optional A-449 display.
UV resistant glass filled polycarbonate
GSTA: Switch selectable 4 to 20 mA, 0 to 5 V or 0 to 10 V; GSTC: BACnet MS/TP or MODBUS® RTU (switch selectable) communication
protocol.
GSTA: Current Output: 10 to 35 VDC, Voltage Output: 15 to 35 VDC or 15 to 29 VAC; GSTC: 10 to 36 VDC or isolated 21.6 to 33 VAC.
Removable terminal block, knock outs for conduit fitting.
Via pushbuttons using A-449 display. Span gas concentration is field selectable on CO units.
1 lb (0.45 kg).
CE.
Wall Mount
With LCD
Wall Mount
Without LCD
Duct Mount
dwyer-inst.com
DWYER INSTRUMENTS, INC.
T: 219-879-8000 | F: 219-872-9057 | info@dwyermail.com
800-872-9141
DS-GSTA/GSTC | 1/17
DIMENSIONS
HOW TO ORDER
Use the bold characters from the chart below to construct a product code
GSTA -N -LCD
SERIES
GSTA - Field selectable analog outputs
GSTC - Field selectable BACnet or MODBUS
communication protocol
®
WIRING DIAGRAM
GSTA Current Output GSTA Voltage Output
GSTC Common Power Supply
GAS SENSED
-C - CO, carbon monoxide
-N - NO2, nitrogen dioxide
OPTIONS
BLANK - Wall mount without options
-D - Duct mount
-LCD - Wall mount with integral LCD
GSTC Local Power Supply
ACCESSORIES
Model Description
A-449
A-505
A-506
A-507
Important Notice: Dwyer Instruments, Inc. reserves the right to make changes to or discontinue any product or service identified in this publication without notice. Dwyer advises its customers to obtain the latest
version of the relevant information to verify, before placing any orders, that the information being relied upon is current.
Remote LCD display
CO replacement sensor
NO2 replacement sensor
Calibration adapter
A-507 A-506 A-505 A-449
DWYER INSTRUMENTS, INC.
T: 219-879-8000 | F: 219-872-9057 | info@dwyermail.com
dwyer-inst.com
800-872-9141
DS-GSTA/GSTC | 1/17
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