KROHNE OPTISYS CL 1100 EN - Manual (Page 25)

OPERATION
5
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OPTISYS CL 1100
www.krohne.com 01/2013 - 4002492301 - MA OPTISYS CL 1100 R02 en
Enter the measured temperature.
Press ^ to confirm the entered value. The manually measured temperature will now be used for
temperature compensation.
5.3.3 pH compensation
The menu for the pH compensation offers 3 different options:
• automatic: the signal converter compensates pH influences on the free chlorine
measurement automatically using the value from a pH sensor connected to input B. This
allows a stable free chlorine measurement in water with changing pH values. Though this
kind of compensation can neither change the effect that the signal output decreases at higher
pH values nor that the disinfection ability of free chlorine decreases with increasing
pH values. As a principle the manufacturer recommends an automatic compensation if the
pH value of the measured medium is between pH 8 and 8.5 with temporal variations.
• manual: the signal converter compensates pH influences using a manually entered value.
This kind of compensation makes sense if you know the pH value, if it is stable and outside
the neutral range.
• off (default setting): the pH compensation is disabled. This option makes sense if the pH value
is more or less stable or in the neutral range (around pH 7). If the pH compensation is
disabled and you use a reference method (like DPD) which compensates the pH influence,
you calibrate this difference in. Hence if the pH value now changes, the calibration is not valid
anymore. However for slight pH changes around pH 7 this effect is only marginal, but for
drastic changes a new calibration is necessary. If those changes happen frequently, you
should select one of the other compensation methods.
Step 2b: probe manual:
Measure the temperature of the measuring medium.
Press > for more than 2.5 seconds, then release the button. You are now on the main menu level.
Press  or  until the main menu setup is highlighted.
MAIN MENU
A quick setup
B test
> C setup
D service
Press > to enter the chosen menu.
You are on the first submenu level. In the upper line of the display "SETUP"
and "C1" appears, beneath the submenu process input A is highlighted.
Press > to enter the chosen menu process input A.
Press  or  until the submenu temperature is highlighted.
Press > to enter the chosen menu. The submenu probe manual is
highlighted.
Press  or  until the submenu manual is highlighted.
Press > to enter the chosen menu.
INFORMATION!
The pH compensation is only necessary for the measurement of free chlorine.