REF #3291
Vacuum Gauge
Vacuum gauges measure negative pressure — the degree of vacuum below atmospheric pressure in a system or line. They are used on suction pipework, vacuum pumps, HVAC systems and industrial processes where maintaining a specific level of vacuum is important to performance or safety. The Hosemaster stocks vacuum gauges in standard dial sizes with BSP connections, suitable for most industrial and commercial vacuum measurement applications. Where both positive pressure and vacuum measurement are required in the same system, compound gauges — which read both above and below atmospheric pressure — are also available.-
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REF #3289
Vacuum Gauge - Centre Back Connection
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£9.53 INC VAT
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REF #3290
Panel Mounting Vacuum Gauge - Centre Back Connection
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£39.35 INC VAT
£32.79 EXC VAT
Vacuum gauges for suction line and process monitoring
Vacuum measurement is straightforward once you understand the scale. Atmospheric pressure is zero on a vacuum gauge — the reading shows how far below atmospheric the system is operating. Full vacuum is -1 bar (or approximately -760 mmHg). Most industrial vacuum applications sit somewhere between those two points, and the gauge needs to cover the relevant range for the system.
Vacuum gauges are commonly used on pump suction inlets to confirm the pump is drawing correctly, on vacuum packaging and forming equipment to verify process vacuum levels, and on HVAC refrigeration circuits during commissioning and leak testing. They're also used in laboratory and process equipment wherever controlled vacuum conditions are part of the specification.
If your system needs to monitor both vacuum and positive pressure — for example, a circuit that cycles between suction and delivery — a compound pressure and vacuum gauge will cover both in a single instrument. Check the product listings for available ranges and connection sizes.
Frequently Asked Questions
What is a vacuum gauge used for?
A vacuum gauge measures negative pressure — the pressure below atmospheric in a system or pipework. Common applications include vacuum pump monitoring, suction line checks, HVAC system commissioning and industrial process equipment where a specific vacuum level must be maintained.
What is the difference between a vacuum gauge and a pressure gauge?
A pressure gauge reads positive pressure above atmospheric — how much pressure is in the system. A vacuum gauge reads negative pressure below atmospheric — how much vacuum. A compound gauge reads both, which is useful in systems that operate in both pressure ranges.
What connection size do your vacuum gauges use?
Vacuum gauges in this range use standard BSP connections. Check the individual product listing for the specific connection size.
How do I read a vacuum gauge?
Vacuum gauges typically read in bar (negative), millibars, inches of mercury (inHg) or millimetres of mercury (mmHg) depending on the gauge. A reading of -1 bar indicates full vacuum; 0 bar indicates atmospheric pressure. Check the scale on the gauge you're ordering to confirm the unit of measurement.