Calibration
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2019 – Valeport Ltd
6.
Calibration
The instruments are calibrated at the factory using industry standard methods, and the calibration certificate
is supplied with the instrument.
The impellers are group calibrated at HR Wallingford, allowing impellers to be changed at any time without
the need for recalibration. Refer to Section 5.3 for details of how to do this.
The following is the seventh order polynomial used for the group calibration of the 106 impeller current
meter:
where
a7=+7.07192656496855E-13
a6=-1.77441548834011E-10
a5=+1.23103627071919E-08
a4=-2.76434849230036E-09
a3=-2.417253365201895E-05
a2=+8.0250814202725E-04
a1=+2.80829724067969E-01
a0=+1.72164197365799E-02
If users require to recalibrate the instrument, then the calibration constants held within the instrument can be
changed. Please refer to the factory regarding the method of carrying out this procedure.
y
a x
a x
a x
a x
a x
a x
a x
a
7
7
6
6
5
5
4
4
3
3
2
2
1
1
0