A Guide to Pressure Gauge Calibration

Proper pressure gauge calibration is key to accurately measuring this force. In this guide, we’ll explain how to ensure that your equipment is working properly.

A pressure gauge is used to measure the pressure – or applied force – exerted by a liquid or gas against a surface. 

For example, an instrument of this kind can ensure that stored gas or liquid is not so pressurised that it will cause damage to its container, but that it exerts sufficient pressure to behave as intended upon extraction or transportation.


Proper pressure gauge calibration is key to accurately measuring this force. In this guide, we’ll explain how to ensure that your equipment is working properly in order to avoid pressure gauge error.


What is Pressure Gauge Calibration?


For health and safety purposes, as well as quality control, pressure gauge calibration is a necessary process for any business that works with pressurised liquid or gas. 


All pressure gauges on the premises must function to the highest possible degree of accuracy. The process of checking and optimising that accuracy is called pressure gauge calibration.


Specialist pressure gauge calibration equipment is available to help you do this. 


The approach usually involves the use of a pressure gauge calibration machine that has been fabricated to reflect pressure gauge calibration standards as accurately as possible.


How to Calibrate a Pressure Gauge


Here we explain the basic process of pressure gauge calibration. The specifics may vary depending on the type of calibration equipment used. 


If there is any uncertainty about how to proceed, the best approach is always to arrange for an expert to undertake calibration on your behalf.


1. Make sure the calibration equipment is calibrated and compatible with your gauge


You don’t want to find yourself adjusting equipment to a standard set by an inaccurate calibration machine. You may need to check with the machine’s manufacturer or arrange an inspection before using it to check your own gauges.


2. Follow the manufacturer’s instructions to set up calibration equipment


If you are unsure of how to do this, you should contact the equipment’s provider.


3. Connect your pressure gauge to the equipment and set it up the way you normally would


This will ensure that it can undertake all the processes required by your business with the utmost accuracy once calibration is complete.


4. Start with maximum pressure


The first test will measure the accuracy of your pressure gauge under the highest amount of strain possible. Repeat this three times for clear results. Each time, check and compare the reading from both your own gauge and the calibration equipment.


5. Apply a low level of pressure, then build-up


Next, apply a low level of pressure and record the reading from both your gauge and the calibration equipment. After this, apply a slightly higher level and record that, too. Continue to increase the pressure by increments, recording and comparing as you go.


In all, you should increase the pressure at least three times – although five is better for accuracy.


6. Repeat the process in reverse


Now you should test your gauge with a gradually reducing level of pressure – again, comparing and recording the results. Do this the same number of times as in the increasing pressure tests.


Once you have completed the process, take care to disconnect the equipment as per the manufacturer’s instructions. Compare the results you have recorded. They should reveal any disparity between your gauge’s readings and those of the calibration machinery.


If you notice a disparity, you may decide to adjust the gauge yourself or arrange for a specialist to undertake the maintenance required.


If you have concerns about any stage in this process, you may prefer to hire a professional to carry out this procedure.


Should I Use Analog or Digital Pressure Standards for Pressure Gauge Calibration?


Generally, digital pressure standards are much more accurate when calibrating equipment. Of course, your choice relies entirely upon the available equipment that is compatible with your specific type and brand of pressure gauge.


When Do I Need to Calibrate my Pressure Gauge?


To avoid pressure gauge error, the equipment should be calibrated at least once a year. You should also do this if you suspect any inaccuracy – however slight – in your gauge’s readings.


Where can I get pressure gauge calibration done?


The team at GNW offers expert on-site and in-house calibration services to make sure that your pressure gauges are functioning to the highest degree of accuracy.


We will ensure the full functionality of all relevant equipment using up-to-date machinery – and we’ll also provide you with calibrated pressure gauge certificates for your records.


Regular, diligent calibration of all pressure gauges will keep your business’s premises safe and compliant, protecting your staff and your overall organisation.

For further information about pressure gauge calibration or to learn more about the products and services offered by GNW, simply get in touch with our team of experienced specialists today. We will be happy to assist you.