Product Overview

The Ceraphant PTC31B is built around Endress+Hauser's Ceraphire ceramic capacitive sensor. Because the sensor is oil-free, it avoids risks related to fill-fluid migration or leakage. It supports low-range measurement down to 0…20 mbar and can withstand absolute vacuum down to 0 bar, which makes it suitable for vacuum processes and low-pressure monitoring.

The device features a compact design, LED indicators and an optional digital display unit for quick local status checks. It supports 1 PNP switch, 2 PNP switches, or 1 PNP switch + 4…20 mA analog output, and can be integrated via IO-Link for simplified parameterization and diagnostics.

Key Features

Oil-free ceramic capacitive sensor

Non-oil-filled Ceraphire ceramic diaphragm provides good corrosion and wear resistance.

High long-term stability

Long-term stability of 0.2 % URL/year helps maintain reliable switching performance over time.

Vacuum-capable design

Suitable for vacuum applications down to absolute vacuum 0 bar.

Compact and easy to integrate

Ideal for distributed monitoring on pumps, compressors, pipelines, tanks and vacuum systems.

LED indicators and digital display

Enables fast local function checks and on-site status monitoring.

IO-Link support

Simplifies configuration, integration and diagnostics in modern automation systems.

Flexible output options

Available with 1 PNP switch, 2 PNP switches, or 1 PNP switch + 4…20 mA analog output.

Optional documentation and cleaning

EN 10204-3.1 inspection certificate, degreasing cleaning and oxygen-service cleaning are available.

Technical Specifications

Item	Specification
Measurement principle	Pressure switch, capacitive ceramic sensor
Sensor type	Oil-free ceramic diaphragm sensor
Supply voltage	10…30 VDC
Reference accuracy	0.5 %; Platinum version: 0.3 %
Long-term stability	0.2 % URL/year
Process temperature	-25…+100 °C (-13…+212 °F)
Ambient temperature	-20…+70 °C (-4…+158 °F)
Sensor range	+100 mbar…+40 bar (+1.5…600 psi)
Maximum overpressure limit	60 bar (900 psi)
Process connections	G1/4, G1/2, MNPT1/4, MNPT1/2, DIN13, JIS R1/2
Communication / output	1 PNP switch / 2 PNP switches / 1 PNP switch + 4…20 mA
Design certification	EN 10204-3.1 inspection certificate
Optional cleaning	Degreasing cleaning, oxygen-service cleaning

Typical Applications

Vacuum system monitoring and protection
Compressed air and process gas pressure control
Steam and liquid pressure monitoring
Pump, compressor and filter protection
Tank and pipeline pressure supervision
Wear-resistant or corrosive media applications
IO-Link-based automation and distributed monitoring systems

Frequently Asked Questions

Is the Ceraphant PTC31B suitable for vacuum applications?

Yes. The ceramic sensor is vacuum-resistant and can withstand absolute vacuum down to 0 bar.

What is the advantage of the oil-free ceramic sensor?

The oil-free ceramic diaphragm reduces risks associated with fill-fluid leakage and provides good resistance to corrosion and wear.

Does the PTC31B support analog output?

Yes. It can be configured with 1 PNP switch + 4…20 mA analog output.

Can the PTC31B be used in IO-Link systems?

Yes. IO-Link support allows easier parameterization, integration and diagnostics.

Is the PTC31B suitable for oxygen service?

An oxygen-service cleaning option is available. Final suitability should be confirmed based on the complete order code and application conditions.

If you need a quotation for the Endress+Hauser Ceraphant PTC31B, please provide the complete manufacturer order code / type code. We can provide pricing based on the specified selection code.

Please note that we do not perform product configuration or selection for this series. Quotations are provided only according to the exact order code you specify.

For the fastest response, please include: