K-Patents PR-23 - Manual (Page 57)

6 Configuration and calibration 49
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 hy-
droxide. 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 Calibration
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 con-
centration. Change of temperature unit will recalculate the numerical temperature
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 factory
laboratory determinations based on the data supplied. The field calibration proce-
dure should be made under normal process conditions using standard laboratory de-
terminations of sample concentration.
Record the calibrating data on the PR-23 field calibration form (found in the end of
this manual), also available at and by emailing a request
to <[email protected]>. Fax the completed Field calibration form to either 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 en-
tered in the Indicating transmitter DTR.