40mm General Purpose Pressure Gauges

Compact 40 mm dry pressure gauges for small machinery and pneumatic equipment. Bottom- and back-entry versions with ±2.5% FS accuracy.

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2 products

40mm Back Entry General Purpose Pressure Gauge

From £19.24

40mm Bottom Entry General Purpose Pressure Gauge

From £19.24

About the 40 mm Range

The 40 mm general-purpose range is intended for close-range pressure indication where there is little room around the instrument. Both bottom- and back-entry versions are available, making the gauges suitable for compact pipework connections and machine panels.

These dry gauges use brass wetted components and are suited to compatible, relatively steady duties. Accuracy is specified at ±2.5% of full scale; choose the pressure or vacuum range to match the task rather than treating a compact dial as a substitute for a test gauge.

The small dial is intended to be read close up. If the gauge will be checked from several metres away, a 63 mm or larger alternative may be easier to use.

Selecting a 40 mm Gauge

The small dial is intended to be read close up. If the gauge will be checked from several metres away, a 63 mm or larger alternative may be easier to use.

40 mm Dial

40 mm format for compact equipment with limited clearance around the gauge.

±2.5% FS Accuracy

±2.5% FS accuracy for routine indication where this tolerance is acceptable.

General Purpose Construction

Choose bottom entry for upright connections or back entry for compatible front panels.

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Applications

Suitable for local indication, replacement and equipment applications where the 40 mm format and general purpose construction suit the duty.

Compact machinery

Provide a local reading beside the machine's controls.

Service systems

Monitor routine pressure on equipment with a suitable medium and range.

Replacement instruments

Check the scale, entry position and connection against the original gauge.

Equipment checks

Use the specified accuracy to decide whether the gauge suits the readings being checked.

How to Choose

Confirm the range and accuracy, check the process medium, verify the available space and match the connection and entry position.

Confirm the range

Cover normal operation and expected peaks while keeping the required readings easy to interpret.

Check the medium

Check the specified copper-alloy wetted components against the process medium.

Check the 40 mm fit

Check access for a spanner as well as space for the case.

Match the connection

Check the exact thread and the entry position offered by the selected product.

Frequently asked questions

Practical answers to help with selection and replacement.

What is the accuracy of these 40 mm gauges?

Both bottom- and back-entry 40 mm models are rated ±2.5% of full scale. Check the measuring range on the selected product.

Why choose a 40 mm dial?

The small dial keeps the installation compact, but needs to be read at close range.

When should I choose another construction?

Consider a filled gauge for vibration or a different wetted material where the medium requires it.

Will it fit an existing gauge connection?

Check the thread form and size, entry position and case dimensions. Matching the dial diameter alone is not enough.