RTD Transmitter - RTDT285
The RTDT285 is a isolating transmitter that accepts inputs from any type of resistance bulb with a signal swing of 7Ω up to 230Ω. In the case of the popular industry standard Pt100 this would represent a temperature span from 15°C up to 650°C.
The RTD is wired in 3-wire fashion to avoid errors caused by lead resistance changes. 2-wire connection can be used with a short lead length or under constant temperature conditions. Lead breakage will cause the output to increase to maximum.
The RTDT285 is linearised to within 0.5% for Pt100 inputs. Differential inputs from 2x Pt100 sensors can only be connected in 2-wire mode. Lead balance errors can be avoided by using approximately even cable run length and same type of cable.
Bipolar temperature differences are calibrated with the 0-point at mid-scale output (12mA).
Final calibration is trimmed using the front accessible zero and span 15-turn trim adjustments and a link selectable output range.
A wide range ac/dc supply powers the input and the output circuit with three way power/input/output isolation
Inputs
RTD
Temperature
Functions
Isolator
Transmitter
Output
dc Current/Voltage - Separate Power
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