What is a pressure gauge?
The gauge is screwed onto the line, and the pressure enters a curved, hollow tube that tries to straighten as it fills. A linkage turns this small movement into the movement of a pointer across a calibrated dial. Gauges are made in many dial sizes, pressure ranges, accuracy classes and wetted materials, and may be filled with liquid to damp vibration. They are used wherever pressure must be seen or monitored.
Listed manufacturers
No pressure gauge manufacturers are listed yet
We add manufacturers product by product. If your company makes pressure gauge, you can list it free and buyers reading this page will find you. Your details are reviewed before they appear.
List your companyPressure Gauge or pressure transmitter?
A pressure gauge gives a local reading you can see, with no power needed. A pressure transmitter converts pressure to an electrical signal for a control system or remote display, and costs more.
What to specify when you ask for a quote
- Pressure range, chosen so the normal reading sits in the middle part of the dial.
- Dial size and the accuracy class.
- Process connection: thread type and size, and its position.
- Wetted materials, compatible with the fluid, and the case material.
- Liquid filling for vibration and pulsation, and any overpressure protection.
- Calibration certificate and the interval for rechecking.
Where it is used
- Oil & GasProcess and pipeline monitoring.
- Water TreatmentPump and filter pressure monitoring.
- Industrial MachineryHydraulic and pneumatic systems.
Frequently asked questions
How do I choose the pressure range?
Choose a gauge whose range is about twice the normal working pressure, so that normal readings are in the middle of the scale and peaks do not damage it.
Why are some gauges filled with liquid?
The liquid damps vibration and pulsation, which protects the movement, steadies the pointer and extends life. It is useful on pumps, compressors and engines.
How often should a gauge be calibrated?
It depends on the use and how critical the reading is. Follow the maker’s advice and your quality system, and shorten the interval for harsh service.
Why does a gauge need a different material for some fluids?
Corrosive or aggressive fluids can attack standard materials, so the parts that touch the fluid must be made of a resistant material, or separated by a diaphragm seal.