The Model ST-T91E Rangeable Room Temperature Transmitter provides stable, accurate room sensing for temperature control and Building Automation Systems, and it is CE approved for level one applications. The attractive, vented housing mounts easily and is made of a durable plastic with a tan enameled aluminum faceplate. The Model ST-T91E has a loop-powered 4-20 mA output with a standard temperature range of 40 to 90F (4 to 32C), although other ranges can be field-calibrated between -30 to 250F (-34 to 121C). To adjust the Model ST-T91E, set the DIPswitches to match the desired range and use the zero and span pots to fine tune. (A high accuracy digital ohm meter and decade box are required.) The Model ST-T91E has a special 20 mA loop-calibration test signal to provide easy system verification. Simply move the bottle plug jumper from NORMto 20 and the transmitter will output a constant 20 mA. The Loop Up LED provides power indication for the 4-20 mA output. FEATURES High accuracy No-drift platinum Loop calibration test signal Low cost Decorative enclosure Loop power LED indication CE approved (commercial and industrial) 18-month warranty CERTIFICATIONS SPECIFICATIONS Sensing element 1000ohm thin film platinum TCR 0.00375 ohm/ohm/C Configuration Two-wire, loop-powered Standard range 40 to 90F (4 to 32C) Max 0 to 140F (-18 to 60C) Rangeability limits -30 to 250F (34 to 121C) Min span 40F (22C) Agency CE (EN50081-1, EN50082-1) Optional CE (EN50081-2, EN50082-2) Industrial RF/EM hardened Output 4-20 mA Output limit 25 mA (sensor leads open) Loop calibration output 20 mA +-0.2% Supply voltage 10.5 VDC - 45 VDC Max impedance 675ohm @ 24 VDC Ambient temp 0 to 140F (-18 to 60C) Humidity 0% to 95% noncondensing Transmitter accuracy 0.1F or 0.2% of span Sensor accuracy +-0.2% of 1000ohm at 0C Approximate sensitivity 2.1ohm / F @ 32F