The Models TT801 and TT807 two-wire 4-20 mA temperature transmitters connect to platinum 100 ohm and 1000 ohm RTD's. Model TT800's are custom calibrated for those tough high and low temperature application ranges. These compact transmitters are extremely rugged and have excellent performance specifications. The Model TT801 accepts a two-wire or three-wire 100 ohm RTD input, and the Model TT807 accepts a two-wire 1000 ohm input. The 4-20 mA signal is factory calibrated over the full range of the user-specified temperature span to provide excellent performance for either thin film or wire-wound platinum RTDs. FEATURES 4-20 mA signal transmitter 1000/100 ohm RTD input Wide, high and low calibration ranges Standard handibox mounting Two and three-wire RTD wiring optional Factory calibrated Functional equivalent to HCT-801 and HCT-807 100% substitute for the discontinued Hycal transmitters SPECIFICATIONS Output 4-20 mA, (750 ohm 24 VDC) Transmitter/Sensor type TT801 Three-wire, 100 ohm 385 platinum RTD (accepts two-wire input also) TT807 Two-wire, 1000 ohm 375 orho 385 platinum RTD RTD current 1 mA nominal, TT801 0.2mA nominal, TT807 Linearity +-0.1% of span Accuracy +-0.1% of span Calibration range Min span 35F (19C) Max span 1112F (600C) Zero Limited by the sensor used Power requirement 8.5-35 VDC Max load (Supply voltage - 8.5) / 0.02A Impedance 250 ohm max @ 14 VDC 750ohm max @ 24 VDC Zero adjust +-5% typical, factory-set, noninteracting Span adjust +-5% typical, factory-set, noninteracting Polarity protection Diode protected Mounting Handibox Ambient temp -40 to 185F (-40 to 85C) Weight 0.3 lb (0.14 kg)