SEM203TC In Head Temperature Transmitter for Thermocouples

The SEM203TC temperature transmitter is our entry level transmitter and our most popular. It accepts most common thermocouple sensors and converts the sensor output to a standard industrial 4 to 20mA transmission signal.

Its temperature range can be set by simulating a thermocouple temperature sensor mV 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 specification 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 K, J, N, E, T, R, S Thermocouples plus mV
Unique Push Button Configuration without a PC
Advanced User Config for Access to 56 Preset Temperature Ranges
4 to 20mA Output
User Push Button Trim
Programmable Burnout
Can be supplied fitted to our temperature sensors.

Specifications @ 20°C

Sensor Type: Range °C: Accuracy:
K -200 to 1370 ± 0.1% of F.S. ± 0.5 °C(plus any sensor error)
J -100 to 1200 ± 0.1% of F.S. ± 0.5 °C(plus any sensor error)
E -200 to 1000 ± 0.1% of F.S. ± 0.5 °C(plus any sensor error)
N -180 to 1300 ± 0.1% of F.S. ± 0.5 °C(plus any sensor error)
T -200 to 400 ± 0.2% of F.S. ± 0.5 °C(plus any sensor error)
R -10 to 1760 ± 0.1% of F.S. ± 0.5 °C(plus any sensor error)over range 800 to 1600
S -10 to 1760 ± 0.1% of F.S. ± 0.5 °C(plus any sensor error)over range 800 to 1600
mV -10 to 70 ± 0.02 % of full scale
Isolation: Tested to 250 V dc
Sensor Burnout: Either up or down scale output
Cold Junction: Range (-40 to 85) °C; Accuracy ±0.5 °C Tracking ± 0.05 °C / °C
Stability: Offset 0.1 °C / °C Span 0.05 °C / °C
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: 3.8 mA (in low burnout condition)
Accuracy: (mA output /2000) or 5 uA (Which ever is the greater)
Loop Voltage effect: 0.2 uA / V.
Thermal drift: ± 1 uA / °C Typically, ±2 uA / °C Max.
Maximum output load: [(Vsupply-12)/20]K Ohms (Example: 600 Ohms @ 24V)

General Specifications

Update time: 500 ms.
Response Time: 1 second
Start up time: Within 8 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

SEM206TC Mechanical Drawing

Electrical Drawing

SEM203TC wiring diagram