Skip to content

Threaded Probes

What is a Threaded Probe?

Threaded probes have a threaded process connection and usually rather short immersion lengths. They are typically used to measure fluid temperatures in pipes, small tanks or boilers. This is why we often refer to them as “boiler temperature sensors” or “boiler probes“. 

Characteristics of Threaded Probes

Since boiler sensors usually touch the medium directly, they are quite precise and responsive. To ensure maximum water tightness and robustness, we mould either a connector or a cable transition directly onto the probe. With boiler probes, unscrewing the probe automatically means opening the process. This means that depending on your application, you’ll either have to empty the boiler or stop the process before removing the probe.  

Threaded temperature probe with overmoulded connector and overmoulded cable transition. These probes are specifically designed as screw-in temperature sensors and available as threaded probe and threaded thermistor.

THREADED SENSORS

Discover Products

A screw-in temperature probe with M12 connector and G1/8 thread

Pt100 temperature probe
with threaded process connection, overmoulded M12 connector

Series: TRC
Measuring range: -50 to 120 °C
Sensor: Pt100
Thread: G1/8
Threaded Pt1000 screw-in probe with G1/8 “ process connection, perfectly suited as boiler probe

Pt1000 temperature probe with threaded process connection, overmoulded cable transition

Series: D045002C
Measuring range: -50 to 150 °C
Sensor: Pt1000
Thread: G1/8
Threaded NTC probe with overmoulded cable transition and a G1/8” process connection as boiler probe

NTC temperature probe
with threaded process connection, overmoulded cable transition

Series: C115011B
Measuring range: up to 150 °C
Sensor: NTC
Thread: G1/8
Screw-in boiler probe with NTC and overmoulded cable transition and G1/4 inch process connection

NTC temperature probe with threaded process connection and overmoulded cable transition

Series: S161016A
Measuring range: up to 150 °C
Sensor: NTC
Thread: G1/4

NTC temperature probe with threaded process connection and overmoulded cable transition

Series: P084002A
Measuring range: up to 150 °C
Sensor: NTC
Thread: G1/4
Screw-in boiler probe with Pt1000 and moulded cable transition and M10 connection thread

Pt1000 temperature probe with threaded process connection, overmoulded cable transition

Series: E100006A
Measuring range: up to 150 °C
Sensor: Pt1000
Thread: M10
Threaded NTC screw-in probe with a G1/8“ union nut as process connection, a perfect boiler probe

NTC temperature probe with M12 ring nut and sealing ring, overmoulded cable transition

Series: M122001B
Measuring range: up to 150 °C
Sensor: NTC
Thread: M12

Get in touch with

Sira Dell'Albani

Sira Dell'Albani

Integrated transducers

By the way, our screw-in temperature sensors are also available with 4-20 mA and 0-10 V output signals. These outputs give you more flexibility and are less susceptible to interference. Take a look at our resistance thermometers with integrated transmitter now! Now also available as MODBUS temperature sensor!
Four different versions of Italcoppie's evo temperature transmitters on a white background
YouTube

By loading the video, you agree to YouTube's privacy policy.
Learn more

Load video

Get in touch with our experts

Fill out the form and we will get back to you within two business days. Or simply give us a call right away!

Contacts

Sira Dell'Albani

Sira Dell'Albani

Frequently asked questions about the screw-in sensor

We are happy to support you in your selection process. Important questions are:

  • in which medium do you want to measure the temperature?
  • what kind of process connection do you need (thread size, thread type, mounting adaptors, etc.)?
  • in which temperature range do you want to measure?
  • what is the ambient temperature at the probe?
  • how do you want to connect the probe?
  • which output signal do you need (Pt100, Pt1000, NTC, 0-10V, 4-20mA, Modbus, IO-Link…)?

 

Together we will find the best threaded probe for your requirements. Get in touch with our experts now!

For applications where high accuracy over a wider temperature range is required, Pt100 screw-in probes and Pt1000 screw-in probes are particularly suitable. If you want to measure in a comparatively small temperature range, a less expensive NTC screw-in probe can also be a good choice.

The choice ultimately depends on your application and your requirements. Our experts are happy to help you!

Very often. Our integrated temperature transmitters provide higher accuracy. They also convert the weak, interference-sensitive signal of the Pt100 into a more robust one such as 0-10V or 4-20mA. Even better: go for a digital transmitter with Modbus RTU right away.

Removing a screw-in probe automatically means that you have to open the process. This means you have to empty the boiler or stop the process before you can unscrew the probe. In some applications this is not an option.

Then a sheathed sensor mounted in a thermowell is a fantastic alternative. This is also optionally available with an integrated temperature transmitter.

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.