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IC CONTROLS
Chlorine Calibration
pH and Temperature impact on
Chlorine
Manual Temperature
Compensation
The measurement of the chlorine concentration is
done by the Galvanic HOCl sensing electrode.
However the Chlorine chemistry of the sample will
change both with temperature and with pH. The
figure on page 14 shows how the relative
c o n c e n t r at i o n s o f h y p o c h l o r o us ac id and
hypochlorite ion shift with a change in the pH. This
same relationship is also dependent on the
temperature of the solution, as the curves will shift
with changes in the temperature. The 875 has been
designed for relatively steady pH and compensates
pH by manual input of the sample pH. Temperature
compensation uses the temperature sensor in the
chlorine electrode.
From the menu select [ tFCl ] [ tc ]. At this point either
[ Auto] (for automatic temperature compensation), or
[ SEt ] (for manual temperature compensation
setpoint) will be displayed. To change the setting from
[ Auto ] to [ SEt ] press Enter to edit the current setting.
The display will start blinking, indicating that a
selection needs to be made. Use the up and down
arrow key to display [ SEt ]. Press Enter to select
manual temperature compensation.
A method has been provided in the analyzer
program to change the compensation method for
temperature compensation from automatic to
manual. Providing a method of manual temperature
compensation allows the analyzer to continue
measuring free available chlorine and total free
chlorine in case the temperature is malfunctioning or
absent.
Page 19
With [ SEt ] as the current display, press Select to
di splay the temperature setting for manual
temperature compensation. If the current value needs
to be changed, press Enter to edit the current setting.
The display will start blinking. Use the up and down
arrow keys to display the desired temperature for
manual temperature compensation. Press Enter to
accept the currently displayed value.
Manual pH Compensation
From the menu select [ tFCl ] [ PH.C ]. At this point
press Select to display the pH setting to be used with
manual pH compensation. If the current value needs
to be changed, press Enter to edit the current setting.
The display will start blinking. Use the up and down
arrow keys to display the desired pH for manual pH
compensation. Press Enter to accept the currently
displayed value.
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875 Instructions