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Pressure Measurement · Glossary

What is Pressure Switch Deadband?

difference between trip and resetPressure Measurement

Pressure switch deadband is the difference between the pressure at which a switch trips and the pressure at which it resets.

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Pressure Switch Deadband Explained

A switch set to trip on rising pressure resets only when pressure has fallen by the deadband. This stops the contact chattering when pressure hovers near the set point.

Deadband may be fixed or adjustable. It must be small enough to reset in normal operation, but large enough to avoid chatter.

Pressure Switch Deadband Formula

Deadband = Ptrip − Preset (rising trip)
Ptriptrip (set) pressure
Presetreset pressure
Example: Trip at 8.0 bar rising, reset at 7.4 bar: deadband 0.6 bar.
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Frequently Asked Questions

What is Pressure Switch Deadband?

Pressure switch deadband is the difference between the pressure at which a switch trips and the pressure at which it resets.

Is deadband the same as hysteresis?

In switches the terms are often used together; deadband is the designed reset difference, hysteresis is the general effect of direction on the reading.

Why does deadband matter for alarms?

If the reset point is never reached, the alarm stays in and operators lose trust in it.

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Pressure switch calibration: 8 simple steps for safe trips

A practical guide on instrumentationblog.in with more detail on pressure switch deadband and how it is applied on real plants.

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Related Terms

Pressure termBlowdownBlowdown is the difference between the set pressure of a relief valve and the pressure at which it closes…Pressure termSet PressureSet pressure is the inlet gauge pressure at which a pressure relief valve is adjusted to start opening.Pressure termPressure SnubberA pressure snubber is a restriction fitted before a gauge or switch to damp pulsation and pressure spikes.

More Pressure Measurement Terms

Pressure termPressurePressure is force acting per unit area. In fluids it acts equally in all directions at a point.Pressure termGauge PressureGauge pressure is pressure measured relative to the local atmospheric pressure, so it reads zero when…Pressure termAbsolute PressureAbsolute pressure is pressure measured relative to a perfect vacuum, so it is never negative.Pressure termDifferential PressureDifferential pressure is the difference between two pressures measured at two points.Pressure termVacuumVacuum is any pressure below atmospheric pressure, from slight suction to near perfect vacuum.Pressure termAtmospheric PressureAtmospheric pressure is the pressure of the air around us; it falls with altitude and varies with weather.

All pressure measurement terms · Full glossary A to Z

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