SEM203P In Head Temperature Transmitter, Push Button Configuration

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

Its temperature range can be set by simulating a temperature sensor resistance 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.

However, if you already know the temperature range you require, we can  configure the product for you at no extra cost.

The SEM203 in head transmitter incorporates the latest digital technology to ensure accurate drift free performance.


Suitable for Pt100 sensor
Unique Push Button Configuration without a PC
Push Button Sensor Matching
4 to 20mA Output
High Stability
Programmable Burnout
Can be supplied fitted to our temperature sensors.

Specifications @ 20°C

Sensor Type: PT100 100R @ 0°C 2 or 3 Wire.
Sensor Range : -195 to +845°C (18 to 390Ω)
Sensor Connection: Screw terminal
Minimum span (*1) : 25 °C
Linearisation: BS EN 60751(IEC 751) standard / JISC 1604
Measurement Accuracy (*2) : 0.2 °C ± 0.05% of Reading.
Thermal Drift: ±0.02 °C / °C.
Excitation current:
Lead Resistance effect: 0.002 °C / Ohm.
Maximum lead Resistance: 20 Ohms per leg.
Output Type: 2 wire, 4 to 20mA current loop.
Output range: 4.0 to 20.0mA
Output Connection : Screw terminal
Maximum output: 21.5mA (in high burnout condition)
Minimum output:
Accuracy: (mA output /2000) or 5 uA (Which ever is the greater)
Loop Voltage effect: 0.2 uA / V.
Thermal drift: ±2 uA / °C
Maximum output load: [(Vsupply-10)/21]K Ohms (Example: 700 Ohms @ 24V)

Note *1 Any span may be selected, full accuracy is only guaranteed for spans greater than the minimum recommended.

Note *2 Basic measurement accuracy includes the effects of calibration, linearisation and repeatability.

General Specifications

Update time: 500 ms.
Response Time: 1 second
Start up time: 4 seconds ( I out < 4 mA during start up)
Warm-up time: 1 minute to full accuracy
Power Supply : 10 to 30 Volts dc
Ambient operating range: -40 to +85°C [Full Accuracy only between -30 to +75°C].
Ambient storage temperature: -50 to +90°C.
Ambient humidity range: 10 to 90% RH non condensing
Dimensions: 43 mm diameter; 21 mm height.
Weight: 31 g (encapsulated).
EMC – BS EN 61326: Electrical equipment for measurement control and laboratory use.
ANNEX A: Immunity test requirements for equipment intended for use in industrial locations
ANNEX F: Test configurations, operational conditions and performance criteria for transducers with integrated or remote signal conditioning.
IEC 61000-4-2: Electrostatic discharge
IEC 61000-4-3: EM Field
IEC 61000-4-4: Transient Burst (output)
IEC 61000-4-5: Surge (output).
Note – Sensor input wires to be less than 3 metres to comply.

Mechanical Drawing

SEM206P Mechanical Drawing

Electrical Drawing

SEM203P wiring diagram