E Three-point calibration
Use ProLink III to run a three-point calibration.
For general applications like specific gravity, molecular weight, relative density, or energy content, the two-
point calibration is the standard procedure to achieve the specified performance.
For specialty applications like purity determination or H2 blending, the three-point calibration is
recommended to maintain the required resolution and linearity.
Note
A three-point calibration produces three calibration factors: K0, K1, and K2.
Prerequisites
SGM calibration is required to generate calibration coefficients for your process gas. These coefficients are
required for accurate measurement.
• Complete the purge procedure. The reference chamber must be filled with the reference gas to the
appropriate pressure.
• Know whether you want the device to operate as a specific gravity meter, a molecular weight meter, or a
relative density meter.
• Identify all required calibration gases and know their specific gravity, molecular weight, or relative density.
• Prepare to flow all calibration gases through the device at the appropriate sample pressure. In a typical
application, the sample pressure should be approximately 15% to 25% greater than the reference chamber
pressure.
• Use the following diagram as a reference.
Configuration and Use Manual Three-point calibration
MMI-20020954 March 2021
Configuration and Use Manual 183
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