Dwyer GSTC-N-D-FC is a nitrogen dioxide transmitter with a drift of <5%. It has an operating temperature range of -4 to 122°F (-20 to 50°C) and an accuracy of ±2% FS for CO and ±3% FS for NO2. It requires a power supply of 10-36 VDC or 21.6-33 VAC with a current of 5.7 mA at 24 VDC. The response time is <45s to 90% CO and <25s to 90% NO2. The range is 0-500 PPM for CO and 10 PPM for NO2. It has an enclosure rating of IP64 with a field-replaceable electrochemical sensor. The humidity range is 15 to 90% RH constant and 0 to 99% RH intermittent. It has a resolution of 1 PPM for CO and 0.1 PPM for NO2. The electrical connections are made through a removable terminal block with knockouts for conduit fittings. It provides output signals through BACnet MS/TP, MODBUS RTU, or MODBUS ASCII communication protocols. It is suitable for a coverage area of 5000 to 7500 sq ft typical. Zero and span adjustments can be made via pushbutton or communication protocol. The storage temperature limits are 32 to 68°F (0 to 20°C). Calibration can be done using the optional A-449 auxiliary display with field-selectable span gas concentration. It is designed for carbon monoxide and nitrogen dioxide gas detection.