K-Patents PR-23 for K-Patents User Manual

Page 25

4.1 Refractometer and Laboratory Test Cuvette

Verification

The verification of the Pharma Refractometer PR-23-AC sensor and static sampling
Laboratory Test Cuvette LTC combination can be made using a set of standard
refractive index (R.I.) liquids following the same procedure laid down in the PROCESS
REFRACTOMETER PR-23 INSTRUCTION MANUAL, Sensor Verification

Section 3.2.

Thorough cleaning of the Laboratory Test Cuvette should be undertaken between each step
of the verification process. This is best achieved by disassembly of the cuvette. This first
requires removal of the Mixer and Paddle. Extraction of the R.I. liquid using a pipette. Then
close both Ball Valves fitted to the inlet and outlet hoses to the Water Jacket. Unclamp the
cuvette assembly from the sensor. Remove the Sample Chamber from the Water Jacket
for cleaning. Clean thoroughly all the wetted surfaces of the Sensor and Cuvette assembly
between each sample change using the specified cleaning solution (e.g. Isopropyl alcohol)
and cleaning tissues.

Operational verification of the Laboratory Test Cuvette using the standard refractive index
liquids is carried out at an operating (liquid sample) temperature of 25 °C (77 °F) with max.
temperature deviation of 1°C.

The deviation of repeated readings should be no more than ± 0.0004 R.I. for valid verification.

For operating instructions of the static sampling Laboratory Test Cuvette LTC see

Section

3.2 – Section 3.6 (this document) and for full Sensor verification instructions see PROCESS
REFRACTOMETER PR-23, INSTRUCTION MANUAL

Section 13.

Verification of Laboratory Test

Cuvette LTC: Static sampling