2002 Manning Systems Ammonia Detectors. Model: EC-F2-NH3. S/N's: 200203-101-ECF2-1, 200203-101-ECF2-3, 200203-101-ECF2-4, 200203-101-ECF2-5, 200203-101-ECF2-6, and 102454-0804-ECF2-1. The Manning Systems’ EC-F2 Sensor is a three-wire, 4/20 mA, electrochemical (diffusion) sensor for ammonia with standard ranges 0-100ppm. The unit exhibits excellent accuracy and precision, with negligible response to common interference gases and dRam Industriesatic changes in relative humidity and offers extremely high reliability (+/- 5%) with no moving parts. Output: Isolated 4/20 mA, 700 ohms max at 24 VDC. Operating Humidity: 5-100% RH (condensing). ATMOSTM enviro-adaptive technology. Power supply: 24 VDC @ 0.25 amps. Overall dimensions (ea): 5-1/2 in. L x 4 in. W x 7 in. H. (ACN9).