ISE Frequently Asked Questions - Sensors:Thermocouples & RTD's
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1 Can I Use Type K thermocouple wires (extension) for an E type thermocouple? What aspects need to be considered for this different type of the thermocouple vs extension wire connection?

You should always use thermocouple wire or thermocouple extension wire that matches the type of thermocouple that you are using (in your case E). Thermocouple or thermocouple extension wire of the proper type must be used all the way from the sensor to measuring…

2 Do I need to use terminal blocks that are made of the same alloys as the thermocouples?

The introduction of an additional alloy such as a terminal or terminal block will not introduce an error as long as the two conductors are at the same temperature. Any errors caused by the additional alloys will cancel out if they are at the same temperature.…

3 How can I use a 2 or 4-wire PT100 probe with a West controller designed for 3-wire probes?

Below is based on connecting to a West 8100, 4100 4400 control. The information is applicable to other controls although the terminal numbers will likely be different. 2 Wire Probes It is possible to use a 2-wire PT100 probe with this instrument. Connect…

4 How do I wire a 4 wire RTD to a 3 wire input on a control?

You can connect a 4 wire RTD to a 3 wire instrument. Just use 3 of the wires. Generally a (4) wire RTD will have 2 white wires and 2 red wires. The active element is between a red and a white wire. The remainig wires are for lead wire resistance compensation.…

5 How far can I run my thermocouples?

Very long thermocouple runs are possible as long as certain precautions are followed. Most instrumentation today have a high input impedance and thermocouple wire is relatively low resistance. For example: A 1000 ft run of type J 20AWG thermocouple wire has…

6 How to connect a 3-wire RTD to a 4-wire input?

The compensation leads on a RTD are used to measure and compensate for the lead resistance. (3) Wire RTD (most common) sensing circuits measure the resistance in one leg and assumes the resistance of the other leg is equal. A (4) wire RTD measures the resistance…

7 What are the color codes for thermocouples?

Thermocouple Color Codes: Thermocouple wiring is color coded by thermocouple types. Different countries utilize different color coding. Jacket coloring is sometimes a colored stripe instead of a solid color as shown. United States ASTM: British BS1843: 1952:…

8 What are the different wiring configurations for RTD sensors?

Typical Wiring and Color Code Configurations for 2, 3 & 4 wire RTD's

9 What is the output of a thermocouple?

Thermocouple output is a small voltage (mV) that relates to the temperature difference between the sensing end and the termination end. For the voltage relationship: Thermocouple Reference Table (mV vs. Temperature) For additional thermocouple technical data:…

10 What sensor types are compatable with the DaqPRO? How do I connect?

Sensor types and connections Each of the 8 input channels of DaqPRO is multipurpose and can be individually configured to any of the following types and ranges: Current: 0 - 20mA Pulse counter (input 1 only) 0 to 65,000 pulses Temperature Internal -25 to…

11 Where can I find additional information covering thermocouples

ISE Thermocouple Technical Reference

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