44 DSGH Installation and Operation Guide
Calibration
You can check the current loop output calibration at any time by using the
test mode to output a user-specified milliamp setting. See page 4-63.
Choosing the linearizer type
The gauge’s response curve is non-linear, due to the measurement method
of radiation transmission. The linearizer determines the shape of the curve
between the endpoints.
The gauge’s linearizer type is part of the signal processing necessary to
produce a linear final output with respect to the change in density of process
material.
The majority of density applications use the equation linearizer method to
perform the one-point calibration method. For density applications, the
equation is the default and we recommend it in most circumstances. If the
results from the equation linearizer method are not satisfactory, contact
VEGA Field service to further explain the other options.
The linearizer equation calculates a density reading for a given count
reading at the detector. To make the correction calculation, it relies on the
following information:
• Vessel’s inner diameter system parameter
• Span settings parameter
• Data used in the calibration
• Absorption co-efficient
9. Click OK.
10. Click OK.
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