2. Allow the sensor to warm up to the ambient temperature before calibration.
3. During calibration the process should be as stable as possible, with the flow rate,
temperature and consistency at the normal level. This ensures the best conditions
for accurate calibration.
4. A sampler specifically designed for taking pulp samples must be installed close to
the sensor.
5. To eliminate human error, follow a predefined standard procedure for sampling,
sample handling and laboratory consistency analysis.
10.3 Calibration methods
The measurement signal response to pulp consistency follow the power-law function:
Cs = A * x
B
. The offset value (deviation from zero) of the measurement can be adjusted
by introducing parameter C to the calculation formula: Cs = A * x
B
+ C.
IMPORTANT: Valmet recommends that the measurement should always be
calibrated using pulp samples measured in the laboratory; in this case the offset
(C) is not required.
Single-point calibration
Select the correct pulp type for the recipe, this determines the value of parameter B.
The value of parameter A is obtained from the calibration sample. In most cases single-
point calibration gives sufficient accuracy for consistency control applications.
Calibration | 34 (48)
K20798 V1.1 EN - 1 - 12/2019
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