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6.4.3 DATA sub-menu
Allows measurement units to be changed – (operating temperature, TDS or conductivity
measurement), and the conversion factor to be changed.
°F or °C (default)
µS / cm
(default) or ppm.
0.5 to 1.0
(default = 0.7)
6.4.2 MODE sub-menu
Allows the user to switch from automatic or manual control of the valve.
Entering this menu (press the button) will always show 'CLOSE' – flashing. The the and
buttons will toggle the state and can be selected by pressing the
button.
To exit the submenu and return to the run mode, press the
button. On exit the valve will revert to 'CLOSE' position.
MODE
OPEN
DATA
TEMP
DATA
PH TERM
DATA
UNITS
PH term
Used to compensate for the changes in water
conductivity due to pH. In the UK, it is recommended
that boilers operate at a pH of 10.5 – 12. During
the calibration procedure, the water sample is
neutralised, typically changing the conductivity
by a factor of 0.7. This factor is the 'pH TERM'.
With higher-pressure boilers or where countries
require a different pH, the actual factor / pH TERM
can be calculated and entered.
Example: A water sample measures 6122
µS / cm (un-neutralised) and 3061 µS / cm
(neutralised) at 25 °C. Enter a pH TERM of '0.50'.
If the calibrated conductivity value is an unneutralised reading, set pH term = 1.00
pH TERM =
Neutralised (µS / cm)
Un - neutralised (µS / cm)
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