Macurco ND-2 nitrogen dioxide gas detector and transducer features a digital display (0-9ppm), NEMA 1 enclosure, 12-24 VAC or VDC operation, adjustable relay and 4-20mA output. For use with the Macurco DVP-120 control panel and HVAC/Building Automation Systems. ***** DISCONTINUED **** Replaced by TX-6-ND