Do You Need a Calibration Certificate for a Pressure Gauge? (UAE Guide)

If you're sourcing pressure gauges in the UAE — for oil & gas, construction, manufacturing, or facilities management — you've likely come across calibration certificates as part of procurement or QA requirements. At Angstrom Building Materials Trading LLC, we supply a wide range of pressure gauges and regularly get asked: do I actually need a calibration certificate, and when?

The short answer: it depends on whether the gauge is new or used, and what it's being used for. Below, we break down when calibration is needed, how the process works, and what to look for in a certificate.

Do You Need a Calibration Certificate for a Pressure Gauge?

This is a common question, and the answer depends on the situation. In general, a calibration certificate becomes relevant for gauges that have been in use, not brand new ones.

Over time, the C-shaped Bourdon tube inside a pressure gauge can deform — especially if it's been exposed to sustained pressure, or repeated cycles of pressure rise and drop. This gradual deformation causes the gauge's readings to drift and become less accurate.

What Happens During Calibration?

The used gauge is mounted on a test bench at a third-party calibration laboratory that holds ISO/IEC 17025 accreditation — the international standard for testing and calibration labs. In the UAE, look for labs accredited by EIAC (Emirates International Accreditation Centre) under the ILAC-MRA (International Laboratory Accreditation Cooperation – Mutual Recognition Arrangement), which ensures the certificate is internationally recognized.

The technician compares the gauge's readings against a high-accuracy digital reference gauge (typically 0.05% accuracy) at low, medium, and full-scale pressure points.

If the gauge's reading deviates beyond its rated accuracy (commonly 1% or 1.6% of full scale), the technician opens the gauge face and uses a small screwdriver to adjust the needle so it matches the reference gauge. For example, if the digital reference reads 2 bar but the analog gauge shows 2.5–3 bar, the needle is adjusted back to align with 2 bar. The test is then repeated across the full pressure range.

Once the readings are within tolerance, the gauge passes. The technician closes the face and applies a calibration sticker showing the serial number, calibration date, and expiry date — typically 12 months from the test date.

Can All Pressure Gauges Be Calibrated?

Not all gauges can be recalibrated. Gauges with a removable face and adjustable needle mechanism can be opened and adjusted. However, gauges with a crimped, sealed case cannot be physically adjusted — they can only be pressure-tested against a reference gauge. If the reading is accurate, the gauge passes (and a certificate can still be issued). If not, the gauge must be replaced, as it cannot be corrected.

Do Brand New Pressure Gauges Need Calibration?

Generally, no. New gauges are factory-tested and calibrated before leaving the manufacturer. However, a calibration certificate may still be requested in certain cases:

• When the gauge will be used as a reference/test gauge, where verified accuracy is critical.
• When a client or auditor requires third-party certification for quality assurance or peace of mind, regardless of the gauge's age.

Need Pressure Gauges in the UAE?

Angstrom Building Materials Trading LLC supplies quality pressure gauges suited for industrial, commercial, and testing applications across the UAE. Contact us for product recommendations or guidance on calibration requirements for your project.

Browse our full pressure gauge collection to find the right gauge for your application, accuracy class, and pressure range.