Ronan X96S DENSITY GAGE - Manual (Page 49)

Density Gage Manual 012407 45
Calibration
Calibration correlates the X96S's output to your actual process density. It instructs the microprocessor to read and store the
detector counts for a low and high density of process. Once the system is conditioned to recognize the low and high density, it
will provide a 4-20 mA output over the entire range of interest.
Reference Modes
One of your first tasks will be to calibrate the system. The first step in the calibration procedure is to "reference" the gage on some
known value. The steps involved in the referencing procedure will vary slightly depending upon the mode selected as the constant.
One of these four REFERENCE MODES will be active on your system:
• Referencing EMPTY (SpG = 0)
• Referencing with WATER (SpG = 1)
• Referencing with PROCESS OF KNOWN DENSITY
• Referencing with ABSORBER
Most applications use the "Reference with Water" or the "Reference with Process" Mode.
Types of Calibration
Two types of Calibration are available for Ronan's Density Monitor.
Dual-Point Calibration requires an accurate laboratory analysis of truly representative samples of two process densities.
Dual-Point Calibration is preferred when the process can be varied to obtain two process densities (one at each end of the
measurement range).
Single-Point Calibration requires an accurate laboratory analysis of a truly representative sample of one process density.
Single-Point Calibration is used as an alternative method when it is not physically or economically practical to vary the
process density. In these cases, a second point is estimated based on the mathematical formula for radiation
transmission/absorption.
Calibration
Low Reference (Single Point Calibration)
The simplest calibration technique is the "Single Point Calibration" where ONE reference sample is taken from a convenient or
easily obtained process condition. This initial reference sample can be any process density in the range of interest.
The conveniently drawn process sample is analyzed in the lab so the known density value can be entered into the X96S as the
reference density (d o ).
Next, the manually calculated calibration constant (1/ut) value, from a table like the one below, is entered into the X96S software.