Pressure Gauges

At BM Engineering, we supply a wide range of pressure gauges for a variety of industries and applications. Pressure gauges are fundamental components of most processing systems and need to be reliable, accurate and easy to use to help avoid system failure in everyday operations. Pressure gauges are an important and inexpensive piece of instrumentation that can save you a lot of hassle. After all, system breakdowns and failures can cost time, money and productivity loss.

Mechanical pressure gauges are used widely in the process industry for a visual indication of the pressure in a system. For example, in a pressure reducing system, where the operator needs to know the pressure of the fluid before and after the reducing valve, a pressure gauge would be imperative.

Pressure gauge types

BM Engineering can supply various pressure gauge types in diameters of 50mm to 300mm. Available in an array of materials, our range of pressure gauges are designed to suit many industries including food and beverage, chemical, pharmaceutical, dairy, brewery, distilling, pneumatic and HVAC.

Our mechanical pressure gauges include process connections that can be screwed BSP or NPT, flange mounted or with a flush diaphragm connection for special hygienic applications. We can also supply pressure gauges with a glycerine or silicone oil filling.

Syphons are available for steam or hot water applications where the temperature needs to be reduced before contact with the gauge. All mechanical pressure gauges offered at BM Engineering are available with ATEX certification, calibration certificates or material certificates if required.

Pressure gauge types

Pressure gauge working temperature

Each type of pressure gauge has a different working temperature, depending on whether it is a dry or glycerine-filled gauge. The standard pressure gauge working temperature for a dry gauge is between -40°C to 65°C and for glycerine-filled gauges -25°C to 65°C. Before you can correctly utilise the pressure gauge properly, you must know the normal operating temperature of the environment you plan to use the gauge in.

To find out more about pressure gauges, take a look at our helpful Pressure Gauge Working Principle PDF.

For more information on the types of pressure gauges we offer, or to purchase your pressure gauge from BME, get in touch today on 0141 762 0657 or via email at


There are several reasons for this. The most common being that you are seeing the effect of temperature change on the liquid within the pressure gauge. You can remedy this in three different ways…

1- Cut the nipple plug – Many pressure gauges come with a nipple plug. Make sure you install it facing up and then cut the nipple plug off.

2- Cool the gauge – Reduce the pressure build-up within the valve by wrapping it in a cold wet towel.

3- Vent the gauge – This is extremely simple and effective. Push the side of the vent plug to equalise the gauge case pressure with the atmosphere.

At BM Engineering we recommend that you choose a gauge that has a pressure range that allows your normal operating pressure to fall in the middle of the scale. For example, choose a 0-160 psi gauge if your normal working pressure is around 80psi. Having a higher range will also protect the gauge from pressure spikes or accidental over-pressure.