Dwyer GSTC-N Nitrogen Dioxide Transmitter is a versatile gas sensor with a field-replaceable electrochemical sensor. It has a wide temperature range of -4 to 122°F and an accuracy of ±2% FS for CO and ±3% FS for NO2. The transmitter operates on a power requirement of 10-36 VDC or 21.6-33 VAC, consuming 5.7 mA at 24 VDC. It has a fast response time and a range of 0-500 PPM for CO and 10 PPM for NO2. The transmitter features an IP64 enclosure rating with a UV resistant glass filled polycarbonate housing. It has a resolution of 1 PPM for CO and 0.1 PPM for NO2. The electrical connections are made via a removable terminal block with knockouts for conduit fittings. The output signal can be BACnet MS/TP, MODBUS RTU, or MODBUS ASCII communication protocol. The transmitter can cover an area of 5000 to 7500 sq ft typical. The zero and span adjustments can be made via pushbutton using the optional A-449 display, and zero adjustment can be made via BACnet or MODBUS communication protocol. For best sensor life, it is recommended to store the transmitter at a temperature range of 32 to 68°F. Calibration of the transmitter can be done via pushbuttons using the A-449 auxiliary display, and span gas concentration is field selectable.