Most manufacturers strongly recommend verifying the calibration of their confined space instruments with a known concentration test gas before use. This test is very simple and takes only a minute or so to accomplish. Most manufacturers agree that it is not necessary to make a calibration adjustment unless reading are off by more than some percentage of the expected value. while advice may differ between manufacturers, several suggest using ±10% as the criterion for determining whether adjustment is required.
Calibration checks can be done in a tiered approach:
- Bump Test
The meter is shown some gas source and it shows some response and may alarm. The gas may be a calibration gas or an indefinite source such as a butane lighter or magic maker.
- Calibration Check
The meter is shown calibration gas and the user verifies that the readings are within a predefined amount, typically ±15% of the calibration gas concentration.
- Full Calibration
- The meter is shown calibration gas and readings are adjusted (automatically or manually) to the certified gas concentration.
- Factory Calibration
The meter is returned to a factory-certified service center for testing and adjustment.
For more information on Calibration Gas, Reglators, Tubing and accessories please click here.
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