K-Patents PR-21-S User Manual
Page 61
6 Configuration and calibration
55
6.6.1 The chemical curve
The chemical curve is the theoretical concentration curve based on n
D
and TEMP.
It is defined by a set of 16 parameters (Table 6.1, one set for each sensor).
C
00
C
01
C
02
C
03
C
10
C
11
C
12
C
13
C
20
C
21
C
22
C
23
C
30
C
31
C
32
C
33
Table 6.1
The chemical curve parameters
A chemical curve is specific to the given process medium, e.g. sucrose or sodium
hydroxide. The set of parameters is given by K-Patents and should not be altered,
except in case of changing to another process medium. The parameters can be
changed by selecting first
5 CALIBRATION
from the Main menu, then, in the Calibration
menu,
1 CHEMICAL & FIELD PARAMETERS
, and finally
1 CHEMICAL CURVE PARAMETERS
.
6.6.2 Selecting display units and display decimals
The display units and display decimals are set separately for each sensor, so first go
to the Calibration menu of the correct sensor. Then select
2 OUTPUTS
in the Calibra-
tion menu and in the Outputs menu choose either
1 DISPLAY UNITS
or
2 DISPLAY DECIMALS
.
For the display units, select either
1 CONCENTRATION
or
2 TEMPERATURE
and then the unit.
For display decimals, enter the number of decimals you want to see on display by
entering a number in the range 0–5 (0 meaning no decimals are shown).
Note: Change of concentration unit will not change the numerical value of the
concentration. Change of temperature unit will recalculate the numerical temper-
ature value according to selected scale (°C or °F).
6.6.3 Field calibration
K-Patents provides a field calibration service that adapts the calibration to the fac-
tory laboratory determinations based on the data supplied. The field calibration
procedure should be made under normal process conditions using standard labo-
ratory determinations of sample concentration.
Record the calibrating data on the PR-21-S field calibration form (found in the end
of this manual), also available at
request to <[email protected]>. Fax the completed Field calibration form to ei-
ther K-Patents headquarters or your local K-Patents representative. A computer
analysis of the data will be made at K-Patents and optimal calibration parameters
will be sent to be entered in the Indicating transmitter DTR.
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
.
If prism wash is employed, do not take samples during the wash. Each data point
consists of: