Handling The R.i. Liquids; Verification Procedure - Vaisala K-PATENTS PR-23 Series Instruction Manual

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The verification of the PR-23 sensor calibration is made using a set of standard refrac-
tive index liquids with the nominal values at 25 °C:
– 1.330
– 1.370
– 1.420
– 1.470
– 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-23 sensor, i.e. the deviation from the latest n
within ±0.0002.
As the specified accuracy of PR-23 is ±0.0002, then the representative level is the sum
of the three accuracy specifications, that is ±0.0004.
Vaisala provides a set of standard R.I. liquids, PR-2300, containing these five liquids.
The set can be ordered directly from Vaisala or through your nearest representative.

13.1.1 Handling the R.I. liquids

Use gloves and safety glasses or goggles. Make sure the ventilation is good, local venti-
lation is preferable. Please review the safety instructions and the MSDS shipped with
the liquids (valid inside R.I. range 1.30-1.57, safety markings valid in EU/EEA areas).
Do not put tissues or liquid bottles in household waste, dispose of waste according to
local regulations for chemical waste.

13.2 Verification procedure

To start the verification process, select
The first verification display instructs you on the pre-verification procedure:
Figure 13.2 Verification, pre-verificaton checks
When you are finished with the preparations, press
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 RI liquid at a time on the sensor and press
(right-most soft key). See Figure 13.3.
PR-23 instruction manual
in the Main menu of your sensor.
1 VERIFICATION
(right-most soft key) to
CONTINUE
calibration, is
D
VERIFY