Free engineering calculators and unit convertersceo@instrumentationblog.in
Pressure Measurement · Glossary

What is a Pressure Gauge Siphon?

steam gauge protectionPressure Measurement

A pressure gauge siphon is a looped or U shaped tube fitted below a pressure gauge on steam to keep hot steam away from the instrument.

Advertisement

Pressure Gauge Siphon Explained

Steam condenses in the loop and forms a water seal. The condensate passes pressure to the gauge while protecting the element from high temperature.

Pigtail and U tube siphons are common. Fill the siphon with water before first start up so the gauge is protected at once.

Advertisement

Calculators for Pressure Gauge Siphon

CalculatorPressure Gauge Range SelectorFree online calculator with formula and worked example.CalculatorBoiling Point CalculatorFree online calculator with formula and worked example.

Free Downloads

Free downloadPressure Gauge Datasheet Template in Excel with Range CheckFree download in Excel and PDF.

Frequently Asked Questions

What is a Pressure Gauge Siphon?

A pressure gauge siphon is a looped or U shaped tube fitted below a pressure gauge on steam to keep hot steam away from the instrument.

Pigtail or U siphon?

Pigtail siphons suit vertical pipes and U types horizontal ones; both trap condensate.

Does the water column cause an error?

Yes, a small head error that matters only for low ranges; correct for it if needed.

You May Also Like

Learn more on the blog

Pressure gauge calibration procedure

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

Read Full Article

Related Terms

Pressure termBourdon TubeA Bourdon tube is a curved tube of oval cross section that straightens as pressure rises, moving the…Pressure termPressure SnubberA pressure snubber is a restriction fitted before a gauge or switch to damp pulsation and pressure spikes.Pressure termDiaphragm SealA diaphragm seal isolates a pressure instrument from the process with a flexible diaphragm and a sealed…

More Pressure Measurement Terms

Pressure termPressure Switch DeadbandPressure switch deadband is the difference between the pressure at which a switch trips and the pressure…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.

All pressure measurement terms · Full glossary A to Z

Advertisement