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6.4.6.5 INPUT - TDS - CAL
The boiler must be at working temperature when calibrating a system. This is particularly
important if a temperature sensor is not fitted.
To ensure accuracy, the figures entered for both Set Point and Calibration must be greater
than 10% of the chosen range. For the best accuracy, calibrate the controller with the TDS as
close as possible to the Set Point. In some cases the boiler may need to be run for a period
of time to allow the TDS to build up before calibration. Recalibrate the boiler at the Set Point
once the boiler has settled down (after a few days in most cases). Check the calibration (as
close to the Set Point as is practical) weekly to ensure optimum performance.
Take a sample of the boiler water and measure its conductivity (in µS / cm) using a meter
such as the Spirax Sarco MS1. If the controller is required to be calibrated as neutralised
conductivity or TDS, neutralise the sample and measure again using the meter.
Enter the measured sample and press the ok button. 'CAL' will be displayed for the purge
time (if set) or for 1 minute (if purge = 0s). At the end of this period the calculated cell / probe
factor (K) will be displayed for 5 seconds. The menu will revert back to the normal run time
menu (PV) or if in commission menu, INPUT-TDS-CAL INT.
INPUT
TDS
CAL
(US / CM)
5010
INPUT
TDS
CAL
(US / CM)
V = 0.510
CAL..
INPUT
TDS
CAL
(US / CM)
K = 0.51
SAVED
Flashes
every
second
Enter the measured
conductivity /
TDS reading
See note
below
Exits automatically
after 5 seconds
Purge time
or 1 min
Press OK
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