K-Patents PR-21-S - Manual (Page 122)

116 PR-21-S instruction manual
The verification of the PR-21-S sensor calibration is made using a set of standard
refractive index liquids with the nominal values at 25 °C:
− 1.330
− 1.350
− 1.360
− 1.370
− 1.390
− 1.410
− 1.430
− 1.450
− 1.460
− 1.470
− 1.490
− 1.500
− 1.520
The accuracy of the certified standard refractive index liquids is ±0.0002 and they
can be traced back to national standards: N.I.S.T Standards # 1823 and # 1823 II.
The repeatability of PR-21-S sensor, i.e. the deviation from the latest n
D
calibration, is within ±0.0002.
As the specified accuracy of PR-21-S is ±0.0002, then the representative level is
the sum of the three accuracy specifications, that is ±0.0006.
K-Patents provides a set of standard R.I. liquids, PR-2000, containing these five
liquids. The set can be ordered directly from K-Patents or through your nearest
K-Patents representative.
12.2 Verification procedure
To start the verification process, select 1 VERIFICATION in the Main menu of your sen-
sor. The first verification display instructs you on the pre-verification procedure:
Figure 12.2 Verification, pre-verificaton checks
When you are finished with the preparations, press CONTINUE (right-most soft key)
to start the verification process.
The verification itself is done by the refractometer system, you only have to follow
the instructions on screen and apply one R.I. liquid at a time on the sensor and
press
VERIFY (right-most soft key). See Figure 12.3.