The Model T81U Platinum RTD Rangeable Transmitter is a two-wire 4-20 mA transmitter designed for use with Type 81 100ohm platinum RTD sensors. The transmitter is available in three standard ranges, or it can be set for any range between 30 to 250F (-34 to 121C) with a minimum span of 40F (22C). To adjust the Model T81U, set the DIP switches to match the desired range and use the zero and span pots to fine tune. A high accuracy digital ohmmeter and decade box are required. The Model T81U has a special 20 mA loop calibration test signal to provide easy system verification. Simply move the bottle plug jumper from NORM to 20, and the transmitter will output a constant 20 mA. The Loop Up LED provides power indication for the 4-20 mA output. FEATURES DIP switch rangeable Loop calibration test signal Snap-track mounting Loop-powered LED indication 18-month warranty SPECIFICATIONS Sensor input 100ohm platinum TCR 0.00385 ohm/ohm/C Output 4-20 mA, loop-powered Rangeability limits -30 to 250F (-34 to 121C) Span min 40F (22C) Accuracy 0.1F or 0.2% of span Loop calibration output 20 mA +-0.2% Supply voltage 10.5-45 VDC Max impedance 675ohm @ 24 VDC Ambient temp 0 to 140F (-18 to 60C) Humidity 0% to 95% noncondensing Dimensions 1.8"W x 2.25"L x 1"H (4.6 x 5.7 x 2.5 cm) Approvals CE