Sensor Verification; Refractive Index N Verification - Vaisala K-PATENTS PR-23 Series Instruction Manual

13 Sensor verification

13 Sensor verification
A company maintaining quality system according to ISO 9000 quality standards must
have defined procedures for controlling and calibrating its measuring equipment.
Such procedures are needed to demonstrate the conformance of the final product to
specified requirements. The company should
– Identify the required accuracy and select appropriate equipment for measure-
ments.
– Establish calibration procedures including a check method and acceptance crite-
ria.
– calibrate the equipment at prescribed intervals against certified equipment having
a known valid relationship to nationally recognized standards. In cases where no
such standards exist, the basis used for calibration must be documented.
Vaisala verifies the calibration of all delivered instruments according to a procedure
similar to the one described Section 13.1. Vaisala K-PATENTS® quality system is
ISO 9001 certified by Det Norske Veritas.
13.1 Refractive index n
Before starting the verifications procedures, make sure that you have a sample holder
at hand. Also check the condition of your standard refractive index liquids. You'll also
need a cleaning solution (ethanol or IPA) and tissues to clean the sensor prism and
the sample holder between the samples.
The sample holder keeps the sample on the prism surface and also keeps the ambient
light out. The universal sample holder PR-1012 (Figure 13.1) can be used with any
PR-23 sensor (in PR-23-M only the top part of the sample holder is needed).
Figure 13.1 The universal sample holder PR-1012
verification
D
209