Vacuum Gauge Sensor Head/Tube: Specifications and Selection

Product Specifications

Technical details and manufacturing context for Sensor Head / Tube

Definition

The sensor head/tube is a critical component of vacuum gauges, designed to house the active sensing mechanism and provide the interface between the measurement electronics and the vacuum chamber. It contains elements such as a Pirani filament, thermocouple, or ionization source, depending on the measurement principle. The primary function is to maintain vacuum integrity while accurately transmitting pressure-dependent signals to the external electronics. Constructed from materials like stainless steel, glass, or ceramic, the sensor head/tube is engineered for durability and compatibility with various vacuum processes. It is available with a measurement range from 1.0E-5 to 1.0E+5 Pa, an accuracy of ±0.25% of reading, and a response time of ≤10 ms. The operating temperature range is -20 to 80 °C, with a burst pressure of ≥2.0 MPa. Electrical connection is via an M12×1 connector per IEC 61076-2-101, and the supply voltage is 24 V DC ±10%. The output signal is a 4-20 mA two-wire loop. Ingress protection is rated IP65 to IP67 per IEC 60529. Wetted parts are made of 316L stainless steel per ASTM A276, and the process connection is G1/2 per ISO 228-1. The weight ranges from 0.2 to 0.5 kg. These specifications are typical reference values; actual values must be confirmed with the manufacturer for specific models and applications. The sensor head/tube is essential for accurate pressure measurement in vacuum systems, ensuring reliable process control and safety.

Working Principle

The sensor head/tube contains an active sensing element whose physical properties change in response to gas pressure. For example, in a Pirani gauge, the resistance of a heated filament varies with thermal conductivity of the gas, which depends on pressure. In a thermocouple gauge, temperature changes are measured. In an ionization gauge, the ion current is proportional to pressure. These changes are converted into electrical signals and transmitted to external electronics, which calculate and display the pressure. The design ensures that the sensing element is exposed to the vacuum environment while maintaining a seal to prevent leaks.

Common Materials

Stainless Steel, Glass, Ceramic

Technical Parameters

Parameter	Typical range	Notes & selection driver
Measurement Range	1.0E-5–1.0E+5 Pa	Wide range for various vacuum applications
Accuracy	±0.25 % of reading	High precision for critical processes
Response Time	≤10 ms	Fast response for dynamic measurements
Operating Temperature	-20–80 °C	Extended range available on request
Burst Pressure	≥2.0 MPa	Safety margin over maximum operating pressure
Electrical Connection	M12×1	Standard industrial connectorIEC 61076-2-101
Supply Voltage	24 ±10% V DC	Reverse polarity protected
Output Signal	4–20 mA	Two-wire loop powered
Ingress Protection	IP65–IP67	Dust-tight and protected against water jetsIEC 60529
Material (Wetted Parts)	316L	Corrosion resistant stainless steelASTM A276
Weight	0.2–0.5 kg	Lightweight for easy installation
Process Connection	G1/2	Other threads availableISO 228-1

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

Sensing Filament/Element Part
The core component whose property (resistance, temperature) changes with pressure.

Material: Tungsten, Platinum, or Nickel
Tube Body/Housing Part
Provides a vacuum-tight enclosure and mechanical connection to the system.

Material: Stainless Steel or Glass
Electrical Feedthrough
Provides electrical connection from the sensing element to external electronics while maintaining vacuum seal.

Material: Ceramic or Glass

Applied To / Applications

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

Vacuum Gauges

View system integration details

Manufacturers of Sensor Head / Tube

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Frequently Asked Questions

What is the typical measurement range of a sensor head/tube?

The typical measurement range is 1.0E-5 to 1.0E+5 Pa, but this can vary by model. Always check the manufacturer's datasheet for the specific range.

What materials are used for wetted parts?

Wetted parts are commonly made of 316L stainless steel, but glass and ceramic may also be used depending on the application. Confirm with the manufacturer.

What is the standard electrical connection?

The standard electrical connection is an M12×1 connector per IEC 61076-2-101. Other connectors may be available on request.

How should I verify the ingress protection rating?

The ingress protection is rated IP65 to IP67 per IEC 60529. Verify the actual rating for your specific model, as it may vary.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	1e-9 mbar to 1000 mbar (measurement range), 2 bar absolute (max pressure rating)
other spec:	Flow rate: 0-10 L/min (gas), Slurry concentration: Not applicable (solid-free environments only)
temperature:	-20°C to 150°C (operating), up to 200°C (short-term exposure)

Sensor Head / Tube

Product Specifications

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