// Catalogue

Pressure Sensors: Hydraulic Pressure Transducers, Transmitters and Switches

Pressure sensors turn line pressure into a signal for alarms, control and logging. TSA Hydraulics Engineering supplies transducers and pressure switches within the Sensors & Switches family of our Motors & Drives range, alongside Temperature Sensors, Flow Sensors, Condition Monitoring, and Hoses, Pipes & Fittings.

Before you swap a sensor that “reads wrong”, bleed the line and check zero. A transducer showing pressure on an empty line has drifted. One that reads zero but lags under load is usually choked by a dirty snubber, and a new sensor won’t fix that. Send the part number, output and thread, and we’ll match a genuine or equivalent sensor.

// Buying guide

Types of Pressure Sensor

Pressure transducers and transmitters: give a continuous signal across the whole range, for control and trending.
Mechanical pressure switches: a piston or diaphragm flips a contact at a set point. Simple and tough, and they need no power.
Electronic pressure switches: a digital display, adjustable switch points and often an analog output too.
Differential pressure sensors: measure the difference between two points, often across a filter.
Mobile pressure sensors: rugged, vibration resistant designs for machines in the field.

Some units combine pressure and temperature sensors in one body, and pressure trends feed straight into condition monitoring.

Choosing the Output

4 to 20 mA: the industrial favourite. It handles long cable runs, and a zero reading shows a broken wire.
0 to 10 V: simple, but best on short runs away from electrical noise.
Ratiometric 0.5 to 4.5 V: common on mobile machines.
IO-Link: digital, with switch points and diagnostics built in.
CANopen or J1939: for mobile machine networks.

Getting the Range and Ratings Right

Range: choose it so normal working pressure sits at around half to three quarters of full scale.
Overload pressure: the most the sensor survives without losing accuracy. Spikes often exceed the working pressure.
Burst pressure: the point where the sensor fails outright.
Accuracy: usually given as a percentage of full scale.
Gauge or sealed reference: gauge sensors read against the surrounding air. Sealed ones suit high pressure and wet areas.

Threads and Process Connections

G1/4 or G1/2 parallel threads with a bonded seal.
7/16 UNF and other SAE threads with an O-ring.
M12 x 1.5 and other metric threads.
NPT taper threads, which are more common on air and water lines.

Matching the thread and the sealing style matters as much as the range. A wrong thread can leak, crack the port or blow out under pressure.

Where Pressure Sensors Earn Their Keep

Controlling servo and variable speed pumps.
Confirming clamping force before a press or machine cycles.
Watching accumulator pressure between pre charge checks.
Warning of blocked filters through differential pressure.
Protecting pumps and presses from overload.
Working with flow sensors on test benches to check pump wear.

Installation Tips

Fit a snubber where valves shift fast or pumps pulse.
Mount sensors away from the pump outlet if spikes are a problem.
Use a test point so the sensor can be checked against a gauge.
Use shielded cable, earthed at one end only.

Pressure Sensors Specifications to Check

Pressure range and reference type
Overload and burst pressure
Output signal and supply voltage
Electrical connector, such as M12 or DIN
Process connection and seal type
Accuracy, response time and IP rating

Why Buy From TSA Hydraulics Engineering

As a pressure sensors supplier, we match the range, output, connector and thread, so the new sensor screws in, plugs in and reads correctly first time. You get OEM or equivalent options, and help sourcing pressure sensors replacement parts such as snubbers, cables, connectors and adaptors. We tell you upfront whether a sensor is genuine or an equivalent.

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