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// Buying guide
Sensors
Pressure Sensors
Pressure transducers send a continuous signal, while pressure switches flip a contact at a set point. Both protect pumps, confirm clamping, control servo pumps and warn of blocked filters. Ranges run from vacuum to well over 600 bar.
Temperature Sensors
Temperature sensors and switches watch the oil in the tank, the return line and the cooler outlet. They start cooling fans, stop machines before the oil overheats, and log trends that show a cooler starting to foul.
Flow Sensors
Flow sensors and switches confirm that oil, coolant or lubricant is actually moving. Turbine, gear and variable area types suit different fluids and accuracy needs, from test benches to cooling water loops.
Condition Monitoring
Condition Monitoring
Condition monitoring tracks the health of the oil and the machine over time. Online particle counters report the ISO 4406 cleanliness code, water sensors catch moisture, and vibration sensors pick up worn bearings early. Together they let you plan maintenance instead of reacting to failures.
Connections and Sealing
Hoses, Pipes and Fittings
Hydraulic hoses, rigid pipe and fittings carry oil between every part of the system. Match the pressure rating, size, thread form and fluid, and route hoses so they don’t rub, kink or twist.
Seals, Gaskets and O-Rings
Seals, gaskets and O-rings keep connections and components tight. Match the material to the fluid and temperature, such as nitrile for mineral oil or FKM for higher temperatures.
Sensor, Switch or Transmitter?
- Switch: an on or off contact at a set point. Simple and reliable for alarms and interlocks.
- Transmitter or transducer: a continuous signal such as 4 to 20 mA or 0 to 10 V, for control and trending.
- Smart sensors: digital outputs such as IO-Link, with built-in switch points and diagnostics.
H2: Choosing the Right Sensor
- Pick a range where normal working values sit around the middle to upper part of the scale.
- Check the overload rating, because pressure spikes can be far higher than a gauge shows.
- Match the output signal and connector, such as M12 or DIN, to your control system.
- Match the process connection, such as G1/4, NPT or 7/16 UNF.
- Check the wetted materials, fluid compatibility and IP rating.
- Use certified sensors in hazardous areas.
Installation Tips
- Fit snubbers or damping orifices on pressure sensors near pumps and fast-shifting valves.
- Mount temperature sensors where the oil actually flows, not in dead pockets.
- Use shielded cable, and keep it away from motor and drive cables.
- Support hoses and sensor leads so vibration doesn’t fatigue them.
Where Sensors Pay Off
- Servo and VSD pumps rely on pressure transducers to control speed.
- Cooling systems use temperature switches to start fans and raise alarms.
- Mining and heavy plant use condition monitoring to avoid unplanned downtime.
- Safety circuits use pressure and position switches to confirm a machine is safe.
Spares Worth Keeping on the Shelf
- A pressure transducer for each critical pump or press.
- Temperature and level switches for the main power units.
- Common hose assemblies and fittings for each machine.
- Seal kits for the fittings and adaptors you use most.
One spare sensor in the store can turn a day of downtime into a ten minute swap.
Sensors & Switches Specifications to Check
- Measured value and range
- Overload and burst pressure
- Output signal and switch points
- Electrical connector and protection rating
- Process connection and wetted materials
- Accuracy, response time and certification
Why Buy From TSA Hydraulics Engineering
As a sensors & switches supplier, we match the range, output, connector and thread, so the new part plugs in and reads correctly. You get clear prices in AUD, OEM or equivalent options, and help sourcing sensors & switches replacement parts such as cables, connectors, snubbers and adaptors. We tell you upfront whether a part is genuine or an equivalent.