High-temperature inductive sensors up to 250°C – reliable detection in extreme conditions

In many industrial processes, standard inductive sensors cannot operate stably due to high ambient temperature. Paint shops, forges, forging lines, industrial furnaces, and drying chambers require solutions resistant to continuous exposure to temperatures reaching 250°C.

The answer to these needs are high-temperature inductive sensors with remote electronics, enabling safe and long-lasting detection of metal objects in demanding production conditions.

High-temperature inductive sensor with remote electronics – industrial applications

What is a high-temperature inductive sensor?

Operating principle of the high-temperature inductive sensor

A high-temperature inductive sensor is a specially designed sensor in which the sensing head can operate directly in the hot zone (up to 250°C), while the control electronics have been physically separated and placed in a safe, cooler zone via a connecting cable.

This solution avoids electronics damage caused by overheating, which is one of the most common problems of standard inductive sensors operating at high temperatures.

Q40 high-temperature inductive sensor

Technical parameters of the sensor up to 250°C

The Q40 high-temperature inductive sensor was designed for operation in the most demanding industrial environments.

• Type: high-temperature inductive sensor
• Size: Q40
• Output: PNP
• Operating mode: NO & NC
• Detection range (Sn): 25 mm
• Maximum operating temperature: 250°C
• Cable length between sensor and electronics: 1–15 m
• Electronics: separated from the sensor head

The large detection range allows the sensor to be mounted at a safe distance from the hot workpiece, further increasing the reliability of the system.

Why is remote electronics crucial in high-temperature sensors?

Temperature resistance of the inductive sensor

In standard inductive sensors, the electronics are the most sensitive to high temperature. In high-temperature solutions:

• the electronics are located outside the heating zone,
• the sensor maintains stable parameters even during long-term operation,
• range drift and signal instability are eliminated,
• the sensor's service life is significantly extended.

Applications of inductive sensors up to 250°C

High-temperature sensors in paint shops

• detection of parts in paint curing ovens,
• presence control of elements on conveyors,
• resistance to high temperature, dust, and fumes.

Inductive sensors in forges and forging operations

• detection of heated metal parts,
• operation in direct proximity to hot workpieces,
• resistance to thermal radiation and temperature spikes.

Heat treatment and industrial furnaces

• hardening lines,
• tunnel and chamber furnaces,
• automation of high-temperature processes.

Other industrial applications

• industrial drying chambers,
• metallurgical industry,
• technological lines with continuous heating.

Advantages of the Q40 high-temperature inductive sensor

• ✔ operation at temperatures up to 250°C
• ✔ remote electronics – high durability
• ✔ detection range 25 mm
• ✔ PNP NO & NC output – easy PLC integration
• ✔ adjustable cable length (1–15 m)
• ✔ ideal for demanding industrial conditions

FAQ – technical questions for maintenance engineers

Can the sensor operate continuously at 250°C?

Yes. The sensor head is designed for continuous operation at temperatures up to 250°C, provided it is correctly installed and the electronics are kept at an appropriate distance from the heat source.

Does the cable length affect sensor operation?

No. The sensor is designed to work with a cable length from 1 to 15 meters without affecting signal stability or detection range.

Where should the electronics be mounted?

The electronics should be mounted outside the high-temperature zone, in a location ensuring standard operating conditions (usually <60°C).

Does the sensor detect hot metal parts?

Yes. The inductive sensor detects metal regardless of its temperature, provided the minimum distance and correct installation are maintained.

Is the sensor suitable for use in paint shops and furnaces?

Yes. The sensor was specifically designed for paint shops, industrial furnaces, forges, and heat treatment.

NO or NC – which output to choose?

The sensor offers NO & NC, allowing you to select the operating mode according to safety requirements and PLC controller logic.

Can a custom cable length be ordered?

Yes. The cable length can be adjusted within the range of 1–15 meters for a specific application.