SERIES GSTA & GSTC | CARBON MONOXIDE/NITROGEN DIOXIDE GAS TRANSMITTER 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 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 ft2 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 seconds to 90% CO; <25 seconds to 90% NO2. Span and Zero Adjustments Via pushbutton, using optional A-449 display. Housing UV resistant glass filled polycarbonate Output 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. Power Supply 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. Electrical Connection Removable terminal block, knock outs for conduit fitting. Calibration Via pushbuttons using A-449 display. Span gas concentration is field selectable on CO units. Weight 1 lb (0.45 kg). Agency Approvals CE. DS-GSTA/GSTC | 1/17 dwyer-inst.com DWYER INSTRUMENTS, INC. T: 219-879-8000 | F: 219-872-9057 | info@dwyermail.com 800-872-9141 Wall Mount With LCD Wall Mount Without LCD Duct Mount DIMENSIONS HOW TO ORDER DS-GSTA/GSTC | 1/17 Use the bold characters from the chart below to construct a product code Model Description A-449 A-505 A-506 A-507 Remote LCD display CO replacement sensor NO2 replacement sensor Calibration adapter 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. ACCESSORIES SERIES GSTA - Field selectable analog outputs GSTC - Field selectable BACnet or MODBUS® communication protocol 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 GSTA -N -LCD WIRING DIAGRAM dwyer-inst.com DWYER INSTRUMENTS, INC. T: 219-879-8000 | F: 219-872-9057 | info@dwyermail.com 800-872-9141 A-507 A-506 A-505 A-449 GSTA Current Output GSTA Voltage Output GSTC Common Power Supply GSTC Local Power Supply Next >