Special-environment proximity sensors
High-Pressure Inductive Proximity Sensors up to 1000 bar
Pressure-rated inductive sensors for end-position detection inside hydraulic cylinders and pumps. The ceramic sensing face sits directly in the pressurized oil, so no separate pressure housing is needed.
- Pressure rating
- up to 1000 bar
- Protection
- IP67 / IP69K
- Sensing face
- Ceramic
- Housings
- M8 · M12 · M18
Quick answer
What is a high-pressure inductive proximity sensor?
A high-pressure inductive proximity sensor detects a metal target through a pressure-resistant sensing face, which is why it is also called a pressure resistant inductive sensor. SEGMENsensor HP models in M8 and M12 are rated to 500 bar (7250 psi) and sealed to IP67 and IP69K. The M18 hydraulic-cylinder type comes in pressure grades up to 1000 bar. Both work as a hydraulic cylinder position sensor, reporting piston end position from inside the cylinder.
Model finder
Choose by housing, output and connection
M8 and M12 models in the table are rated to 500 bar. For up to 1000 bar, see the M18 hydraulic-cylinder type below the table. Housing length is the last part of the part number.
| Part number | Housing | Length | Sensing distance | Output | Supply | Connection |
|---|
M8 / M12 models: operating temperature -25 °C to +70 °C, flush mounting.
M18 high-pressure inductive sensor for hydraulic cylinders
Order by pressure grade. Other M18 data is available on request.
Part number guide
Reading a SEGMENsensor part number
Typical application
End-position detection in hydraulic cylinders
- The sensor threads into the cylinder end cap with its ceramic face exposed to the oil.
- When the piston reaches end of stroke, it enters the sensing range.
- The output switches and the controller stops or reverses the stroke. No external cams or limit switches are needed.
Specifications
Technical data, M8 / M12 models
| Pressure rating | 500 bar (7250 psi) |
| Sensing distance | 1 mm (M8), 1.5 mm (M12) |
| Mounting | Flush |
| Supply voltage | 10–30 VDC (NPN/PNP), 10–60 VDC (DC 2-wire) |
| Max. load current | 200 mA |
| No-load current | < 5 mA |
| Voltage drop | < 1.5 V |
| Switching frequency | 1 kHz |
| Hysteresis / repeatability | < 15 % Sr / < 1.0 % Sr |
| Operating temperature | -25 °C to +70 °C |
| Protection | IP67, IP69K |
| Protection circuits | Short-circuit, reverse polarity, overload (220 mA) |
| Housing / sensing face | Stainless steel / ceramic |
| Connection | 2 m oil-resistant PVC cable or M12 connector |
| LED indicator | Yes |
| Approvals | CE, RoHS |
Datasheets and dimension drawings are sent by email on request.
Standards: IEC 60947-5-2 (proximity switches) · IEC 60529 IP ratings
Comparison
HP series vs. a standard inductive sensor
| Feature | Standard inductive | SEGMENsensor HP |
|---|---|---|
| Pressure at sensing face | Not pressure-rated | 500 bar (M8/M12), up to 1000 bar (M18) |
| Sensing face | Plastic cap | Ceramic |
| Washdown rating | Usually IP67 | IP67 + IP69K |
| Mounting in cylinder | Outside, with cam or flag | Through the end cap |
“Standard inductive” describes a typical general-purpose sensor, not a specific product.
Ordering
Samples, MOQ and OEM
MOQ 1 piece. Sample and production lead times are confirmed with your quotation.
Contact us about OEM and private-label options.
FAQ
Common questions
What pressure can an inductive proximity sensor withstand?
A standard inductive sensor is not rated for pressure at the sensing face. SEGMENsensor M8 and M12 HP models are rated to 500 bar (7250 psi). The M18 hydraulic-cylinder type is available in grades of 250, 350, 500, 800 and 1000 bar.
Where is the sensor installed in a hydraulic cylinder?
It threads into the end cap so the sensing face sits in the oil. When the piston reaches end of stroke it comes within the sensing range (1 to 2 mm depending on size) and the output switches.
Which housing length should I choose?
Pick the length that matches the depth of the mounting bore in your end cap. M12 models are available from 43 mm to 138 mm; the length is the last part of the part number, for example L69 for 69 mm.
Which model do I need for 1000 bar?
Choose the M18 hydraulic-cylinder type in the 1000 bar grade. M8 and M12 models are rated to 500 bar.
What is the operating temperature range?
M8 and M12 HP models operate from -25 °C to +70 °C. For hotter processes, see the SEGMENsensor high-temperature series.
Do you offer NPN, PNP and 2-wire versions?
Yes. NPN and PNP 3-wire models run on 10 to 30 VDC. DC 2-wire models run on 10 to 60 VDC. Each is available normally open or normally closed.
What does IP69K mean?
IP69K is a protection level for high-pressure, high-temperature washdown. It is defined in ISO 20653; IP67 comes from IEC 60529, the standard for enclosure protection.