How to Identify If Your Air Compressor Has an Internal (Sump) Pressure Sensor
Technicians frequently need to determine whether an air compressor is equipped with an internal pressure sensor - typically located in the sump or oil separator area. This is essential when performing diagnostics, maintenance, retrofitting, or when integrating the unit with the DRIVE+, which requires internal pressure data, if available, for full functionality.
This guide outlines how to identify the presence of an internal pressure sensor across different compressor types and models.
What is an Internal (Sump) Pressure Sensor?
An internal pressure sensor is an electronic component that continuously monitors the pressure inside the sump or separator. It provides real-time feedback to the compressor’s controller to enable:
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Precise pressure regulation
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System diagnostics
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Internal pipework protection
Unlike mechanical pressure switches, which operate via spring mechanisms and binary switching, internal pressure sensors provide digital, continuous data.
How to Identify One: Step-by-Step Guide
Check the User Manual or Technical Specifications
Start by reviewing the documentation that came with the compressor. Look for key terms such as:
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“Internal Pressure Sensor” / “Transducer”
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“Receiver Pressure”
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“PS2” (often denotes the second/internal pressure sensor)
If the manual lists two pressure sensors, it's very likely that the second one is the internal (sump) pressure sensor.
Inspect the Compressor Physically
If no clear information is found in the manual, you can inspect the unit directly:
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Look around the sump, oil separator, or main discharge area
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Identify a small electronic sensor threaded into a port, with wiring routed to the control panel
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Look for labels showing pressure ranges or part numbers
Review the Control Panel
Digital control interfaces often rely on pressure sensor input. Signs that an internal sensor is present include:
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An internal pressure readout or ability to set precise pressure values
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A display showing both network pressure and a second/internal pressure
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A readout of differential pressure, i.e., the difference between network and internal pressure
If the control panel shows these values, an internal sensor is almost certainly installed.
Search the Model Number Online
If you’re still unsure, try searching online. Use your compressor’s model number with keywords such as:
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"[Model Number] pressure sensor" -
"Internal sensor schematic [Model Number]"
Look for technical drawings, parts diagrams, or service bulletins that reference a pressure sensor located near the sump or separator.
Need Help?
If you’re working on a specific unit and still unsure whether an internal pressure sensor is installed, contact your distributor or service partner with the following:
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Compressor model number
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Serial number
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Photos (especially of the separator area and control panel)
They’ll be able to confirm the sensor configuration.
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