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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.

NTC thermistor probes are an affordable option as a temperature sensor in various applications. The NTC temperature sensor is well suited for smaller temperature ranges.

NTC

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Classic cable probe with silicon cable and metal pocket available as NTC, Pt100 and Pt1000

NTC cable probe assembly with metal tube, silicone cable

Series: FTR2SIL
Measuring Range: -50 to 180 °C
Sensor: NTC, Pt100 or Pt1000
Cable Material: Silicon
Black cable probe made from TPE. Overmoulded sensing element. Available as Pt100, Pt1000 and NTC.

NTC cable probe with overmoulded sensing element, waterproof (IP68)

Series: IKE2
Measuring Range: -40 to 105 °C
Sensor: NTC, Pt100 or Pt1000
Cable Material: TPE
Black cable probe made from TPE. Overmoulded sensing element. Available as NTC, Pt100 and Pt1000

NTC cable probe with overmoulded sensing element, IP67

Series: IKS
Measuring Range: -40 to 105 °C
Sensor: NTC, Pt100 or Pt1000
Cable Material: TPE

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Paola Bagatta

White cable probe made from TPC. Overmoulded sensing element. Available as NTC, Pt100 and Pt1000

NTC cable probe with overmoulded sensing element, IP67

Series: IHS
Measuring Range: -30 to 150 °C
Sensor: NTC, Pt100 or Pt1000
Cable Material: TPC
Purpose-built pipe surface probe tied to a pipe for measurement, available as NTC, Pt100 and Pt1000

NTC pipe temperature sensor for direct mount on pipes, IP67

Series: ICSKIN
Measuring Range: -40 to 85 °C
Sensor: NTC, Pt100 or Pt1000
Cable Material: TPE
Threaded NTC probe with overmoulded cable transition and a G1/8” process connection as boiler probe

Threaded NTC probe assembly, overmoulded cable transition

Series: C115011B
Measuring Range: up to 150 °C
Sensor: NTC
Thread: G1/8
Threaded NTC probe with overmoulded M12 connector and G1/8” process connection as boiler probe

Threaded NTC probe assembly, overmoulded M12 connector

Series: B049017A
Measuring Range: -50 to +120 °C
Sensor: NTC 2.252K
Thread: G1/8

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Paola Bagatta

Frequently asked questions about the NTC temperature sensor

An NTC can be a good choice when you need to measure within a relatively small temperature range below 200 °C – for example, when measuring the room temperature, the temperature in a refrigerator or in a boiler. With temperatures above 200 °C or a wide required range, we recommend a Pt1000 instead.

Due to the extremely high resolution, NTCs can be very accurate within a limited range. However, since their curve is exponential, this is only the case in a fairly small temperature range. In addition, unlike Pt100, Pt1000 and thermocouples, NTCs are not standardised. Therefore, there is a confusing variety of NTC sensing elements.

An interesting advantage of the NTC over other resistance thermometers comes into play with long cables: the comparatively high reference resistance of usually well over 1,000 ohms ensures that the cable resistance is virtually insignificant even with long cable lengths.

To select an NTC, you must either know or define two important values:

First, the nominal value. This is the resistance at a reference temperature. For NTC, the resistance at 25 °C is usually specified here. An NTC with the designation “3k3” or “3.3k” has a resistance of 3,300 ohms at this reference temperature.

Another important factor is the beta value. It indicates the temperature coefficient and thus the course of the characteristic curve.

If you are unsure about these values, get in touch with our experts – we are happy to help you find the right NTC.

Regarding the response time of a sensor, the following rule of thumb applies: If you double the diameter, you quadruple the response time. So choose the diameter wisely!

As with all temperature sensors, the immersion length should be at least 5x the diameter of the sensor to avoid thermal bridges.