Figure 39 Concentration Calibration Layers - Vaisala PR-23 Series User Manual

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3.
FIELD CALIBRATION
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Figure 39 Concentration calibration layers
1 The information from the CCD element and the Pt-1000 temperature element. The
position of the shadow edge, see
CCD and scaled 0 ... 100 %.
2 Sensor calibration: The actual refractive index n
process temperature is calculated from the Pt-1000 resistance. The sensor output is n
and temperature TEMP in degrees Celsius. The calibrations of all sensors are identical,
which makes sensors interchangeable. The calibration of each sensor can be verified
using standard refractive index liquids.
3 Chemical curve: The indicating transmitter DTR receives n
concentration value according to chemical curves. The result is a temperature-
compensated calculated concentration value CALC.
CCD
n
D
CHEMICAL CURVE
CALC
DAMPING
CONC
mA OUTPUT
Figure 143 (page
Chapter 7 – Configuration and calibration
Pt-1000
TEMP
259), is described by a number called
is calculated from the CCD value. The
D
and TEMP and calculates the
D
Sensor
Indicating
transmitter
DTR
D
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