• EXPERIENCED
    30+ years of knowledge
  • SPECIALISTS
    Fit2Fit-Accredited
  • GLOBAL
    Delivering training worldwide
  • ONE-STOP SHOP
    Everything in one place

How it works

At Fire Safe International, we test and calibrate portable and fixed gas detectors used for oxygen, flammable-gas and toxic-gas monitoring.

A bump test exposes the detector to test gas to confirm that the sensor responds at the expected trigger point and that its audible, visual and vibrating alarms operate. 

Calibration goes further by applying a certified gas concentration, checking the displayed reading against that reference and adjusting the instrument where necessary.

During the service, our technicians identify the detector, fitted sensors, measurement ranges and alarm settings before inspecting the inlets, filters, pump, tubing, battery, display and warning devices. The instrument is then zeroed, exposed to the correct test gas at the specified flow rate and tested again after any adjustment to verify the final reading and alarm response.

Book Your Air Quality Test

Testing the detector in the configuration you depend on 

We always use the test gas, regulator and tubing specified for the detector and the gas it is intended to measure. This is especially important for reactive gases such as ammonia or chlorine, which can be absorbed by unsuitable sampling equipment, and for flammable vapours that require a manufacturer-approved correction factor.

For pumped portable detectors, we can also check the probe, pump and sample tubing for leakage, blockage and delayed response. For fixed systems, the agreed test can extend beyond the sensor head to the controller, beacons, sounders, relays and shutdown outputs.

Each instrument is returned to you with a clear record of the gas applied, readings obtained, adjustments made, alarm operation and return-to-service decision.

contact our team

Who we help 

Our gas detection calibration service is primarily designed for people responsible for managing gas detection equipment and testing programmes. Our customers use the service for a variety of portable, pumps, and fixed instruments used in confined-space entry work, process work, shutdowns, hot work, and emergency response applications.

Book A Training Course

Why work with Fire Safe International? 

Our team bring a wide range of confined-space, emergency-response and respiratory-protection experience to the calibration conversation. That means you can discuss a detector in the context of the entry, process or alarm duty it serves, without first teaching a general calibration provider how the instrument is used. We also work with portable, fixed, single-gas and multi-gas equipment from many manufacturers, making us a practical choice of service provider for mixed fleets. When an instrument repeatedly causes concern, you’ll have access to experienced engineers who can ask the right questions and help you decide whether recalibration, repair or replacement deserves attention.

Is bump testing enough?

No. A bump test confirms that the sensors respond and the alarms activate when exposed to test gas, but does not verify measurement accuracy or correct sensor drift. Full calibration is still required at the manufacturer’s specified intervals, and after a failed bump test, sensor replacement, significant impact or questionable readings.

Can calibration be carried out on-site?

Yes, in many cases. Portable and fixed gas detectors can be calibrated at your premises, reducing equipment downtime and allowing installed systems to be checked in their working environment. Any detector requiring specialist repair or more extensive investigation may need workshop attention, which will be explained before it is removed.

What happens if a detector fails?

Any detector that fails a bump test or calibration should be withdrawn from use and clearly identified. The cause may be a depleted sensor, contamination, battery or alarm fault, or sensor drift. The item can then be recalibrated, repaired or replaced, with a function check before being returned to service.

Why is calibration important?

Calibration keeps the detector’s readings aligned with a known concentration of test gas. Sensors can drift, become contaminated or lose sensitivity over time, causing alarms to trigger too early, too late or not at all. Regular calibration confirms measurement accuracy and supports reliable decisions about entry, evacuation and respiratory protection.

Which gas detectors can you calibrate?

We can calibrate portable and fixed gas detectors from a wide range of manufacturers, including single-gas and multi-gas instruments used to monitor oxygen, flammable gases and toxic gases.

Find out more

For more information about gas detection calibration, please call us directly on 01743 761000, or leave us a message through the contact form on this page and we’ll get back to you shortly.