Calibration & Checking Gas Detectors

Categories: Gas Detection

To see if a gas detector works a “Bump Test” is performed, this means applying the correct gas to the sensor to check operation integrity, by viewing the gas reading on the monitor in real-time.

As a guide, OSHA recommends a daily bump test before carrying out work in the field, by following the manufacturer’s instructions. A bump test is purely an operational test and does not check the accuracy, a calibration does.

“Calibration” is the comparison of measurement values displayed on a device against a known accuracy standard. In other words are the readings the same or out in comparison to the standard? If the readings are out, the gas monitor will need to be calibrated or recalibrated. This means resetting of the detector’s response against a known concentration of target gas, in a balance of synthetic air or nitrogen.  The instruments sensors are exposed to gas allowing the instrument to automatically adjust the readings to coincide with the known concentration of the calibration gas. Or the operator will manually adjust the readings to match.

Calibration times vary dependent on sensors, expired time and usage. For the gas detector pictured left (standard 4 gas monitor LEL, CO, H2S, O2), the recommended calibration period is every six months.

We provide calibration gas, automatic calibration stations, regulators and tubing.