Pressure Gauges

Choosing the right pressure gauge

GNW supplies analogue and digital pressure gauges for pneumatic, hydraulic, vacuum and process measurement. Options include dry and glycerine-filled cases, corrosion-resistant stainless-steel construction, low-pressure capsule instruments, dial sizes from 40 mm to 160 mm, and bottom-entry or back-entry connections.

Start by identifying the pressure type. Gauge pressure is measured relative to atmospheric pressure. Vacuum gauges measure pressure below atmosphere, compound gauges cover both vacuum and positive pressure, and absolute gauges measure relative to a sealed vacuum reference. Select the type that matches the process and control requirement.

Choose a range that keeps the normal operating pressure comfortably within the scale. Avoid continuous operation close to full scale, and allow additional margin where pressure pulsation, surges or overpressure may occur. For low gas pressures, see our low-pressure capsule gauges. For a numerical display and the specifications offered by each model, compare our digital pressure gauges.

For straightforward air, water and compatible fluid duties, general-purpose pressure gauges provide a practical option. Industrial pressure gauges are intended for more demanding installations, while glycerine-filled gauges help steady pointer movement where vibration or pulsation affects readability.

All-stainless-steel pressure gauges offer improved corrosion resistance. Stainless-steel construction does not by itself make a gauge hygienic or suitable for every aggressive medium. Confirm the wetted-part and seal materials, process connection, cleaning method and operating conditions before use in food, pharmaceutical, chemical or washdown environments.

Dial size affects readability and available installation space. Compact 40 mm and 50 mm gauges suit smaller equipment; 63 mm is a common general-purpose size; and 100 mm or 160 mm dials offer clearer viewing at a distance. Check the connection thread and whether bottom or back entry best suits the pipework or panel arrangement.

Pressure snubbers, syphons, overpressure protectors and related pressure gauge accessories can help protect the instrument or adapt it to the installation. Traceable calibration is available where stated or selected. If the application is unusual, contact GNW’s technical team before ordering.