K-Patents PR-33-AC - Manual (Page 29)

6 Configuration and calibration 23
© Copyright K-Patents 2014. All rights reserved.
6 Configuration and calibration
6.1 Configuring the refractometer
In the Sanitary OEM Refractometer, all parameter changes are made with a web
browser through the parameters page, see Section 5.2.
6.1.1 Signal damping
The system provides the possibility to enter signal damping to diminish the influence of
process noise. The damping is applied to the CONC value (and thus the output signal).
40
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0 10 20 30 40 50 60 70 80 90 100 110 120
Time [s]
C
O
N
C
[
%
]
30 s
15 s
7 s
Figure 6.1 Effect of damping time on measurement
There are two different damping types available in the Sanitary OEM Refractometer.
The linear damping is a sliding average, and it is recommended for most cases. The
damping time represents the averaging time. For fast damping, use 0–2 s damping, for
minimal noise, use a value of 10 s or more.
The exponential damping is a single time constant (one pole) low-pass filter. If this
option is chosen, the damping time represents the half-time of the filter. The damping
time recommendation is the same as for the linear damping.
With both types of damping the residual random noise is inversely proportional to the
square root of the damping time. In practice, using a damping time of more than 30 s