K-Patents PR-33-AC - Manual (Page 32)

26 PR-33-AC instruction manual
Document/Revision No. Rev. 1.02 Effective: June, 2014
Measure the calibrating data by using the Field point functionality on the on the Sani-
tary OEM Refractometer homepage (see section 5.3.1). Record the data either on the
field calibration form (found in the end of this manual or at
http://www.kpatents.com/
)
or print out the field points on the web page.
In case you have a constant offset, you can perform a bias adjustment, see section 6.2.3.
For a more detailed field calibration, send the completed calibration form to either
K-Patents headquarters <[email protected]> or your local K-Patents representative.
A computer analysis of the data will be made at K-Patents and optimal calibration pa-
rameters will be sent to be entered in the system.
For a complete report, 10–15 valid data points (see below) are needed. A data point is
of use for calibration only when the diagnostic message is
NORMAL OPERATION
.
Each data point consists of:
LAB%
Sample concentration determined by the user
CALC
Calculated concentration value
T
Process temperature measurement in Centigrade
nD
Actual refractive index n
D
CONC
Measurement in concentration units, the large size number
In addition to the calibration data, write down the refractometer serial number.
Accurate calibration is only achieved if the sample is taken correctly. Pay special atten-
tion to following details:
−
The sampling valve and the refractometer should be installed close to each other
in the process.
!
Warning! Wear protective clothing appropriate to your process when operating the
sampling valve and handling the sample.
−
Run the sample before starting to collect data points to avoid sampling old process
liquid that has remained in the sampling valve.
−
Read the values
CALC
,
T
(emp),
nD
and
CONC
at exactly the same time with sam-
pling.
−
Use a tight container for the sample to avoid evaporation.
Important: Offline calibration using process liquid very seldom gives reliable results,
as problems are caused by