Pressure is one of the most important operating variables in hydraulic, pneumatic, and process manifold systems. Measuring pressure at strategic locations can reveal system load, restrictions, valve behavior, filter condition, pump performance, actuator conditions, and abnormal operating events.
Manifold blocks can incorporate dedicated sensor or gauge ports so pressure can be measured close to the circuit being monitored.
System Monitoring
What Pressure Measurement Tells You
Pressure represents the force per unit area acting within the fluid system.
In hydraulic equipment, pressure often reflects the load being resisted by an actuator or motor. In pneumatic systems, adequate pressure is needed to produce the required cylinder force and operate valves reliably.
Electronic Measurement
Pressure Transducers and Sensors
A pressure transducer converts applied pressure into an electrical signal that can be read by displays, controllers, data systems, or machine electronics.
Industrial pressure transducers are available for many pressure ranges and fluid environments.
Pressure sensors can support monitoring, control, alarm functions, and automated decision-making within manifold systems.
Pneumatic Measurement
Air Pressure Sensors
Pneumatic systems can use pressure sensing to confirm supply pressure, monitor individual branches, detect pressure loss, or verify that actuators receive adequate compressed air.
Industrial air pressure sensors are intended for measurement applications involving air or compatible gases.
Sensor location should correspond with the specific part of the pneumatic circuit engineers want to evaluate.
Switching
Pressure Switches
Some applications do not require continuous pressure measurement. Instead, the control system only needs to know whether pressure has crossed a defined threshold.
Industrial pressure switches provide switching behavior based on pressure conditions.
This can be useful for alarms, permissive logic, pump control, machine sequencing, or confirming that a pressure condition has been reached.
Sensor Locations
Where to Measure Pressure in a Manifold Circuit
Manifold Integration
Sensor Ports in Machined Manifolds
Custom manifolds can include dedicated threaded ports for sensors, switches, gauges, and test fittings.
Integrating these connections into the block can reduce additional external tees and fittings.
The port should communicate with the intended passage while leaving sufficient material between neighboring circuits and providing physical clearance for the sensor body and wiring.
Diagnostics
Using Pressure to Troubleshoot Manifold Systems
Comparing pressure at multiple locations can help identify where a system is losing energy.
A large pressure difference across a filter, valve, hose, or manifold passage may indicate restriction.
Pressure that rises but produces little actuator movement can point toward mechanical loading, valve routing, or actuator problems rather than inadequate pump output.
Engineering
Pressure Sensor Selection Factors
Complete Measurement
Combine Pressure and Flow Data
Pressure data becomes even more useful when combined with flow measurements and knowledge of valve position, actuator movement, and pump output.
Together, these measurements can show not only that a system is under pressure, but whether the expected fluid movement is actually occurring.
Explore Flow Measurement →