Introduction
The calibration gas is a reference gas or gas mixture used as comparative standard in the calibration of analytical instruments, like gas analysers or gas detectors. Therefore, a calibration gas has to be of a precisely defined nature or composition, like zero gas or span gas, for example 500 ppm carbon monoxide in nitrogen.
Calibration gas is known by several names such as cal gas, span gas (used during span calibration), test gas (for general verification), reference gas (as it provides a known reference point), standard gas (due to standardized concentration), and certified NIST calibration gas (emphasizing NIST traceability).
Calibration gas requires traceability to a national or international standard. Traceability is the unbroken chain of comparisons to an acceptable international standard. The calibration gas standard establishes a known analyzer response to a certified chemical component concentration.
Purchasing Guide
Please read the following before purchasing the calibration gases:
1. gas composition and concentration;
2. cylinder capacity, pressure and quantity;
3. Whether you need pressure regulating valve?
4. other requirements.
