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Einschraubfühler mit B-Kopf - AH 600 °C Vorderansicht
Screw-in probe with B-Head - AH 600 °C
€ 121,01 *
Order number: 803023-2011
Einschraubfühler mit B-Kopf - HL 600 °C Vorderansicht
Screw-in probe with B-Head - HL 600 °C
€ 123,59 *
Order number: 803021-9011
Einschraubfühler mit B-Kopf - OH 400 °C Vorderansicht
Screw-in probe with B-Head - OH 400 °C
€ 87,30 *
Order number: 803020-8011
Einschraubfühler mit B-Kopf - OH 600 °C Vorderansicht
Screw-in probe with B-Head - OH 600 °C
€ 105,74 *
Order number: 803020-9011
Einschraubfühler mit J-Kopf - HL 200 °C Vorderansicht
Screw-in probe with J-Head - HL 200 °C
€ 68,18 *
Order number: 803018-3011
Einschraubfühler mit J-Kopf - HL 400 °C Vorderansicht
Screw-in probe with J-Head - HL 400 °C
€ 72,38 *
Order number: 803018-4011
Einschraubfühler mit J-Kopf - HL 600 °C Vorderansicht
Screw-in probe with J-Head - HL 600 °C
€ 76,58 *
Order number: 803018-5011
Einschraubfühler mit J-Kopf - OH 200 °C Vorderansicht
Screw-in probe with J-Head - OH 200 °C
€ 43,79 *
Order number: 803017-3011
Einschraubfühler mit J-Kopf - OH 400 °C Vorderansicht
Screw-in probe with J-Head - OH 400 °C
€ 47,06 *
Order number: 803017-4011

Guide Screw-in probe with head

Our screw-in probes with connection head can be used in process measurement technology in a temperature range up to 200 °C, 400 °C or 600 °C. They are installed directly in contact with the medium using the G1/2 “ process connection. We offer our screw-in probes with exchangeable measuring insert and according to DIN 43772 in different types.

In this guide, we have compiled information on what you need to consider when selecting, purchasing, installing and operating your screw-in probe.


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What is a screw-in probe with head?

Screw-in probes with connection head are used in process measurement technology. They can be screwed in for temperature measurement in contact with the medium or using an immersion sleeve with an internal thread. There they measure the temperature in gaseous or liquid media. Temperatures of up to +600°C can be measured in pipes, containers or systems. We offer a suitable immersion sleeve, connection cables and thermal conduction paste as accessories. The Screw-in probes can be individually adapted to your application.

Please consider the following points when making your selection

  • What is the measuring range, i.e. in which temperature range should the measurement take place?
  • What is the ambient temperature? (The heads, housings or connection cables, like the sensors used, also have a temperature range in which they may be used).
  • What other ambient conditions prevail (humidity, steam, pressure, vibration?)
  • In which medium should measurements be taken?
  • How should the temperature probe be installed in the process, i.e. which process connection is required?
  • How much space do you have for installing the probe? 

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What different types of screw-in probes with head are there?

We offer screw-in probes that are designed in accordance with DIN 43772




With these probes, you can determine which mounting length you require and thus determine the immersion depth for these probes. We offer the following lengths (in mm):
50, 100, 150, 200, 250, 300, 400 and 500.

When measuring temperatures in solids or when the probe is mounted in an immersion sleeve, the air surrounding the probe slows down the heat conduction from the medium to the probe. This also slows down the temperature measurement and, in extreme cases, leads to incorrect temperature readings. Therefore, please ensure that the temperature probe is thermally coupled to your measuring medium in the best possible way.

You can choose from the following sensors for all Screw-in probes, depending on the connection head and measuring range:

  • Pt100 sensors: Pt100 class A, Pt100 class B, Pt100 1/3 class B, Pt100 1/10 class B
  • Pt1000 sensors: Pt1000 class A, Pt1000 class B
  • Pt500 sensor: Pt500 class B
  • Ni1000
  • NTC: 5kOhm, 10kOhm, 20kOhm
  • KTY: KTY81-110, KTY81-210
  • LM235Z

Other sensors are available on request.

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 What do I need to consider when selecting the right Screw-in probe with head?

The right choice of temperature probe depends on your measuring task and the associated requirements for the temperature probe. We often hear questions such as:

  • Is the probe also compatible?
  • Which sensor type should I choose?
  • Can I change my temperature probe?
  • Is this the right sensor?
  • Which cable do I need or can I replace the cable?

Answering the following questions can help you make the right choice:

  1. What is the right sensor?
    In our online store you will find the following sensors for Screw-in probes: Pt100 class A, Pt100 class B, Pt100 1/3 class B, Pt100 1/10 class B, Pt1000 class A, Pt1000 class B, Pt500 class B
    Please pay attention if and if yes which kind of sensor your measuring device / measuring point specifies and please check exactly if the characteristic curve of the sensor fits to the characteristic curve which is stored in your measuring device. If necessary, you will find this information in the operating instructions. The characteristic curves of our sensors can be found here in the overview or also in the operating instructions, which you can download for each sensor type.

  2. Does the sensor fit to your measuring range?
    In the operating instructions you will also find the measuring ranges in which the sensor may be used. Please note that the cables, connectors or housings also have a temperature range in which they may be used.

  3. What is the correct connection type for your screw-in temperature probe?
    You can order the Pt sensors from us as two-, three- or four-wire versions. Please check at your measuring device / at your measuring point whether you need a three-wire or a four-wire version. The distance between the measuring point and the measuring device should also play a role in your considerations.

    Two-wire circuits
    In two-wire circuits, the intrinsic resistance of the connecting lead adds to the resistance value of the measuring resistor (thermistor or Pt) and thus falsifies the measurement result. If the resistance value of the measuring resistor is large compared to the intrinsic resistance of the connecting lead, this intrinsic resistance can be neglected. However, for measuring resistors with a lower resistance value (e.g. PT100), the intrinsic lead resistance can significantly reduce the measuring accuracy. For this reason, we recommend the two-wire technique in conjunction with low-resistance measuring resistors only if you can use comparatively short connecting leads, i.e. if you only have to cover short distances between the measuring point and the measuring instrument.

    Three-wire circuits
    For applications that require very accurate temperature measurement, we recommend that you use a three-wire or even four-wire circuit. In the three-wire circuit, the lead resistance of each of the three connected cables is determined using the third connected cable (all connecting wires must be exactly the same length) and then subtracted from the total measured resistance (measurement resistance + lead resistance), so that effectively only the resistance value of the measurement resistance is used for temperature determination. This subtraction can be performed automatically in the measurement electronics, for example.

    Four-wire circuits
    The safest and most accurate measurement is achieved using a four-wire circuit. Here, an additional cable is connected on each side of the measuring resistor. Two cables are used for the voltage supply, the other two are used to determine the line resistance (if necessary also asymmetrically, i.e. also with connecting wires of different lengths) and to subtract it from the measured resistance value. This subtraction can be carried out automatically in the measurement electronics, for example.

  4. How do you ensure the correct mechanical connection of the temperature probe to the process?
    Correct mechanical connection of the temperature probe to the process ensures efficient, error-free and trouble-free measurement.

    Thread size / process connection
    For Screw-in probes, please make sure to select the correct thread size and use the thread according to the operating instructions.

    Mounting length
    For temperature sensors with metric screw-in threads (as G1/2", G1/4" and G3/8") you can choose the mounting length. Please measure in advance which mounting length you need. Each probe requires a minimum immersion depth in order to accept and correctly measure the temperature of the medium to be measured. As a rule of thumb, the following advice can serve you: optimally, the immersion depth should correspond to 10 times the thermowell diameter, but at least a 5-fold value should be used.
    More detailed information on installation and immersion depths can be found in the operating instructions, which can be downloaded for each probe.

    Environmental influences
    Please also pay attention to whether you have certain requirements at the measuring point or in your process regarding temperature, pressure, IP protection, steam or similar and compare your specification with our data sheets. If you have any questions or are unsure, please feel free to contact us.

  5. What do I have to consider when mounting the temperature probe?
    Please check whether you need accessories for the correct mounting of your Screw-in probe. If necessary, thermal paste can improve the conductivity and thus the response time. Maybe you also need a suitable immersion sleeve?

  6. Which accessories do you need for your temperature probe?
    Please check the delivery details for each temperature probe to see what is included in the scope of delivery and consider whether you need accessories when placing your order.
    We offer the following accessories:



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Replacing a defective probe

When replacing a defective temperature probe, please pay close attention to which temperature sensor you require. Sensors such as PT100, PT1000, KTY, NTC or thermocouples are not compatible with each other. Therefore, please check the technical data of the respective system which sensor type is required. If the required information is not apparent in the operating instructions of the measuring instrument / device, the manufacturer of the machine or system should be contacted in case of doubt.

Once you have found the correct sensor, please also test the mechanical connection. The temperature can only be measured correctly if the temperature probe can be attached to the mounting location in accordance with the regulations. Otherwise, machines and equipment can easily malfunction.

Please also make sure that you order thermal paste and mounting accessories such as compression fittings, cutting ring screw fittings or bayonet nipples if these also need to be replaced.

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Frequently asked questions about temperature sensors

How can I tell if my temperature probe is defective?

The temperature probe shows strange values? The temperature probe does not show any values? This behavior may be a sign that your temperature probe is defective or that it has not been connected correctly.

To find out if there is a defect, you can simply measure the resistance value of resistance-based temperature probes and compare it with the specification on the probe itself or in the user manual. You can use a standard multimeter to do this.

If you are using a thermocouple instead of a resistance-based temperature probe, the situation is somewhat different. Here you need a multimeter with an appropriate connector for thermocouples, because thermocouples do not have a resistance signal, but a voltage signal.

Alternatively, you can test on a trial basis whether a replacement will remedy the situation.

How do I connect the temperature probe correctly?

When connecting your temperature probe, please make sure that you follow our wiring diagrams. You will find the wiring diagrams in the operating instructions for your temperature probe.

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