4-20mA PT100 Temperature Transmitter



The SEM203P is our entry level Pt100 temperature transmitter. It converts the sensor output  to a standard industrial (4 to 20) mA transmission signal.

The temperature range can be set by simulating a temperature at the low and high end of scale required, and pushing the button to output 4mA at the low end, and 20 mA at the high end. The advantage of this method is that you do not need to connect the product to a computer to carry out this function.
INPUT                                                                                                                                                SPECIFICATIONS @20°C
Type/Function Range/Description Accuracy/Stability
PT100 2 or 3 wire (-200 to 850) °C ± 0.2 °C ± 0.05 % of reading *2
Thermal drift Zero at 20 °C ±0.02°C/°C
Minimum span 25 °C *1
Linearization BS EN 60751(IEC 751) standard

/ JISC 1604

Excitation current Approximately 1mA
Lead resistance effect 0.002 °C / Ohms
Maximum lead resistance 20 Ohms per leg
*1 Any span may be used; full accuracy is only guaranteed for spans greater than the minimum recommended
*2 Basic measurement accuracy includes the effects of calibration, linearization and repeatability



OUTPUT                                                                                                                                               SPECIFICATIONS @20°C
Type/Function Range/Description Accuracy/Stability/Notes
Two wire current (4 to 20) mA (mA output /2000) or 5 uA

(Whichever is the greater)

Thermal drift Zero at 20 °C 2 uA /°C
Maximum output current 21.5 mA In high burnout condition
Minimum output current < 3.9 mA In low burnout condition
Loop voltage effect 0.2 uA / V
Maximum output load [(V supply – 10)/20] KΩ 700 Ω @ 24 V DC
Loop supply (10 to 30) V DC SELV