NTC PROBES

What is an NTC?

An NTC is a semiconductor-based temperature sensor from the family of thermistors. NTC stands for “negative temperature coefficient”. The electrical resistance decreases exponentially with increasing temperature. This makes one of the most important differences compared to a linear probe like a Pt1000.

Characteristics of NTC Probes

Within a small temperature range – somewhere between -50 to 150 °C depending on the exact model – NTC have a high resolution and thus relatively high accuracy. They are also cheap and due to their high resistance values, you can use them with cables of any length as the cable resistance does not affect the measurement significantly. NTC are not standardized, so finding the right model may be a challenge which we are happy to help you with.

An unfinished NTC temperature probe with visible sensing element next to a finished NTC probe

Ntc

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HOW TO MOUNT
A NTC PROBE

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NTC

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Recommendations for Use Cases

Every time you have a small temperature range to measure – for example when measuring environmental temperature, the temperature in a refrigerator or in a boiler. Only special NTC can withstand temperatures above 200 °C. If you have a wider range or higher temperatures, we recommend to use a Pt1000 instead.

Suggestions for NTC

To select an NTC, you have to define the nominal value (resistance at a reference point) and the beta value (curve coefficient). If you are unsure of these values, get in touch with our experts and they will gladly help you find the right NTC.

Please keep in mind that as with all temperature sensors, the immersion length should be at least 5x the diameter of the probe in order to avoid thermal bridge errors.

Also, when it comes to response time, consider this rule of thumb: if you double the diameter, you quadruple the response time. Choose the diameter wisely!

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