Sensor Connection Head for Thermowell Assemblies

Product Specifications

Technical details and manufacturing context for Sensor Connection Head

Definition

The sensor connection head is a critical component of thermowell assemblies that provides a sealed, protective enclosure for temperature sensors such as RTDs or thermocouples. It serves as the interface between the sensor element and external wiring or instrumentation, ensuring secure electrical connections while protecting against environmental factors like moisture, dust, and mechanical damage. Typically mounted at the top of the thermowell stem, it allows for sensor installation, calibration access, and maintenance without compromising process integrity. The head houses the sensor terminals and provides a junction point for connecting sensor leads to external instrumentation cables. It maintains electrical continuity while offering environmental protection through sealed enclosures, gaskets, or conduit entries. Some models include terminal blocks, connection boards, or signal conditioning electronics to facilitate proper sensor wiring and signal transmission. Available materials include stainless steel, aluminum, and plastic (e.g., polycarbonate). Key parameters include connection thread and cable entry of M20x1.5 per DIN 43729, protection class IP65–IP68 per IEC 60529, operating temperature range -40 to 120 °C, material grade 316L per ASTM A276, weight 0.3–0.5 kg, head diameter 50–80 mm, head height 60–100 mm, terminal block 2–4 poles, ingress protection IP66–IP68 per IEC 60529, cable gland thread M20x1.5 per DIN 46320, and surface finish Ra≤0.8 μm per ISO 1302. These values are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier. The connection head is designed to fit standard thermowells and is used in machinery and equipment manufacturing. It is a component, not a standalone instrument, and its selection depends on the sensor type, process conditions, and environmental requirements. Always confirm model-specific specifications and compliance with relevant standards before procurement.

Working Principle

The connection head houses the sensor terminals and provides a junction point for connecting sensor leads to external instrumentation cables. It maintains electrical continuity while offering environmental protection through sealed enclosures, gaskets, or conduit entries. Some models include terminal blocks, connection boards, or signal conditioning electronics to facilitate proper sensor wiring and signal transmission. The head is mounted at the top of the thermowell stem, allowing access for installation, calibration, and maintenance without disturbing the process. The sealing and ingress protection ratings (IP65–IP68) ensure resistance to dust and water, depending on the model. The operating temperature range of -40 to 120 °C defines the ambient limits for continuous operation. The connection thread and cable entry sizes (M20x1.5) are standardized for compatibility with common thermowell and cable gland systems. The terminal block configuration (2–4 poles) accommodates different sensor wiring schemes. The head's material and surface finish (e.g., 316L stainless steel with Ra≤0.8 μm) are selected based on corrosion resistance and hygiene requirements. Verification of the actual model's parameters and compliance with standards is necessary before use.

Common Materials

Stainless Steel, Aluminum, Plastic (e.g., Polycarbonate)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Connection Thread	M20x1.5	Standard for thermowell headsDIN 43729
Cable Entry	M20x1.5	For sensor lead connectionDIN 43729
Protection Class	IP65–IP68	Dust-tight and water-jet protectedIEC 60529
Operating Temperature	-40–120 °C	Continuous operation
Material	316L	Corrosion-resistant stainless steelASTM A276
Weight	0.3–0.5 kg	Depends on size and material
Head Diameter	50–80 mm	Fits standard thermowell
Head Height	60–100 mm	Accommodates terminal blocks
Terminal Block	2–4 poles	For sensor wiring
Ingress Protection	IP66–IP68	Submersible if specifiedIEC 60529
Cable Gland Thread	M20x1.5	Standard for cable entryDIN 46320
Surface Finish	Ra≤0.8 μm	Smooth for hygieneISO 1302

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Enclosure Body Part
Provides structural protection and mounting interface

Material: Stainless Steel or Aluminum
Cover/Gasket Part
Seals the enclosure against environmental ingress

Material: Stainless Steel with Silicone/EPDM Gasket
Terminal Block
Provides secure electrical connections for sensor wires

Material: Copper Alloy with Plastic Insulation
Conduit Entry Part
Allows cable entry while maintaining seal

Material: Stainless Steel with Plastic Sealing Nut
Signal Conditioning Electronics Optional
Head-mounted transmitter electronics that turn the raw sensor signal into a 4-20 mA or digital output.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Thermowell Assemblies

View system integration details

Manufacturers of Sensor Connection Head

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Frequently Asked Questions

What is the purpose of a sensor connection head?

The sensor connection head provides a sealed, protective enclosure for temperature sensors (RTD or thermocouple) within a thermowell assembly. It serves as the interface between the sensor element and external wiring, ensuring secure electrical connections while protecting against moisture, dust, and mechanical damage. It also allows access for installation, calibration, and maintenance.

What are the typical connection thread and cable entry sizes?

According to the reference data, the connection thread and cable entry are both M20x1.5, conforming to DIN 43729. The cable gland thread is also M20x1.5 per DIN 46320. These are standard sizes for compatibility with common thermowell and cable gland systems, but always verify the specific model's dimensions.

What protection classes are available?

The protection class ranges from IP65 to IP68 per IEC 60529, depending on the model. This indicates dust-tightness and protection against water jets or submersion. The ingress protection is also listed as IP66–IP68. Confirm the exact rating for the specific model to ensure it meets your environmental requirements.

What materials are used for the connection head?

Available materials include stainless steel (e.g., 316L per ASTM A276), aluminum, and plastic (e.g., polycarbonate). The material choice affects corrosion resistance, weight, and suitability for different environments. Verify the material grade and surface finish (e.g., Ra≤0.8 μm) with the manufacturer for your application.

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pressure:	Up to 100 bar
other spec:	Flow Rate: Up to 10 m/s, Slurry Concentration: <30% solids by weight
temperature:	-40°C to 400°C

Sensor Connection Head

Product Specifications

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