Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 29 (44)
Note: When changing between pH-decreasing chemicals and pH-raising chemicals, the
suction lances, the metering hoses, the flow fittings and the injection valves must be
rinsed out with water and thoroughly cleaned.
Alarm / error message
There is an error if the red "Alarm" indicator lamp blinks. If you press the "Info" key, the error message will be
shown on the display in plain text.
Acknowledging an error message
If you press the
OK
key, the acoustic alarm will be switched off.
Measuring chamber colors
Behind the pH and redox electrodes are multi-colored RGB light-emitting diodes, which signal different
states.
When a new WATERFRIEND is installed and the electrodes have been calibrated, the color light will turn green.
As the operating time progresses, the color changes steadily over yellow, orange and red. At the latest when the
color light is red, the corresponding sensor must be calibrated.
Meaning of the individual colors
Blue:
The flow rate of the measuring water is too low and the dosage is
therefore blocked. The flow rate must be between 0.2 and 2.0 l /
min. (Recommended 0.7)
Red:
The electrodes must be calibrated.
Green
:
The electrodes are calibrated.
Yellow/orange:
Various operating hours have passed since the last calibration.
Flashing red:
Error message. Please press the info key and read more information
in the display.
