Hydraulic pressure sensors must handle high static pressure, fast pressure spikes, continuous vibration and demanding installation environments. Mobile machinery adds temperature extremes and shock. Standard industrial transmitters are often not suitable. This guide covers the key selection criteria for hydraulic applications — and leads into the sensor selector for a structured shortlist.
Hydraulic systems present a combination of challenges that eliminates many standard industrial pressure transmitters: high static pressure, fast pressure spikes, strong vibration, and demanding installation environments. Mobile hydraulics adds temperature extremes and exposure to shock and dirt.
Industrial hydraulic systems typically operate at 100–600 bar, with some applications exceeding 1000 bar. Verify burst pressure and overpressure limits in addition to the nominal range.
Valve switching and pump pulsations can generate pressure spikes 2–5× the nominal system pressure. Sensors must be rated for these transients — not just the steady-state pressure.
Mobile machinery and hydraulic power units generate continuous vibration. Verify the sensor's vibration and shock rating, especially for piezoresistive designs with internal electronics.
Mobile hydraulics can see −40 °C in cold starts. High-cycle industrial presses can generate significant heat. Verify the operating and compensated temperature ranges for both media and ambient.
The required output interface depends strongly on the application. Mobile hydraulics increasingly uses digital fieldbus interfaces, while industrial hydraulic systems often use standard 4–20 mA or 0–10 V analogue outputs.
| Interface | Typical use | Notes |
|---|---|---|
| 4–20 mA | Industrial hydraulics, press control, power units | Simple, robust, long cable runs. 2-wire or 3-wire. Most common for industrial hydraulic systems. |
| 0–10 V / 0–5 V | Industrial systems, test benches | Low impedance output, suitable for short cable runs and direct PLC connection. |
| CANopen / CAN interfaces | Mobile machinery, off-highway equipment | Available on selected hydraulic pressure sensors. Exact protocol support, including J1939, must be verified for the selected model and configuration. |
| IO-Link | Industrial machines, hydraulic power units | Digital communication with diagnostics. Increasingly adopted in industrial hydraulic systems. |
| M12 connector | Mobile hydraulics, off-highway | Common robust connector for mobile machinery and industrial hydraulics. Deutsch/DT, cable outlet or other sealed connector variants may be used depending on the machine platform. |
| Criterion | What to check |
|---|---|
| Pressure range | Nominal range plus overpressure and burst pressure. For hydraulic presses, verify the sensor handles full system relief pressure. For mobile machinery, verify cold-start and pressure spike ratings. |
| Pressure spikes | Check the overpressure rating and the sensor's response to fast transients. Some sensors have internal damping; others use external snubbers. Verify whether snubbers are required for the application. |
| Vibration & shock | Verify the rated vibration (g RMS) and shock (g) values against the machine specification. For mobile applications, IEC 60068-2-6 (vibration) and IEC 60068-2-27 (shock) are common test standards. |
| Process connection | G1/4 and G1/2 are most common for hydraulic systems. SAE and NPT threads for North American equipment. Verify thread type and sealing — hydraulic systems use both metal-to-metal and O-ring face seal (ORFS) connections. |
| IP / protection | IP67 is commonly specified for outdoor and mobile equipment. IP69K may be required for wash-down or high-pressure cleaning. Verify the connector or cable entry rating matches the installation environment. |
| Temperature range | −40 °C is commonly specified for mobile machinery in cold climates. Hydraulic fluid temperature can reach 80–100 °C in high-cycle systems. Verify compensated range covers both extremes. |
| Media compatibility | Standard hydraulic mineral oil is compatible with most stainless sensors. Biodegradable hydraulic fluids, water-glycol or phosphate ester fluids may require specific seal materials — verify compatibility. |
Construction equipment, agricultural machinery, forestry machines and municipal vehicles require sensors that withstand extreme vibration, shock, temperature cycling and ingress. Analogue outputs remain common, while CANopen or other CAN-based interfaces are available on selected sensors and machine platforms. Robust sealed connectors such as M12 or Deutsch/DT are commonly used, depending on the machine platform. Pressure ranges up to 400–600 bar are common for steering and lift systems.
High-force presses generate fast pressure spikes during clamping and blanking. Sensors must handle overpressure transients reliably. Response time requirements can be demanding. 4–20 mA with analogue output is most common for press control. Pressure ranges of 250–600 bar typical.
Power units for industrial machines typically require 4–20 mA or 0–10 V output, G1/4 or G1/2 connections, and IP67 protection. Vibration from pump and motor must be considered. IO-Link is increasingly used for condition monitoring integration.
Verify before specifying: Always confirm pressure range including overpressure and burst rating, vibration and shock specification, temperature range, connection type and media compatibility against the manufacturer datasheet. Pressure Selector provides a shortlist for further evaluation — it does not replace engineering review or certification assessment.
For promising matches, use Request Info on any result to prepare a supplier inquiry.
Pressure Selector converts application requirements — such as pressure range, pressure spike rating, vibration resistance, output interface, process connection, IP rating and temperature range — into a structured shortlist of matching hydraulic pressure sensors.
Coverage includes selected hydraulic pressure transmitters and sensors for mobile and industrial applications from manufacturers such as SSI Technologies, Hydac, Parker, NovaSensor, Ashcroft, BD Sensors and others. Standard analogue outputs (4–20 mA, 0–10 V) are broadly represented. IO-Link and CANopen are available on selected series. Availability of digital interfaces, overpressure ratings, shock/vibration ratings and connector variants depends on the selected series and configuration.