41
LRGT 1x-x - Installation & Operating Manual -
819877-00
Changing the temperature coefficient
You can adjust the temperature coefficient manually, as long as an appropriate value has been
established.
The factory setting of “2.1” is normally used for steam generating units with a constant
pressure. For newly installed electrodes, this figure may need to be adapted in line with the
temperature coefficient of the boiler water.
Pay attention to the setting instructions on page 38 / 39 and proceed as follows:
1. Select the parameter “
tC
”.
2. Press and hold the rotary knob until the current value flashes on the display.
3. Set the desired value (000.0 – 003.0).
4. Save your setting by pressing the rotary knob for approx. 1 second.
Raising the “tC” value lowers the display value.
Using the “CAL” function
The CAL function enables convenient readjustment of the cell constant “CF” when the electrode gets
increasingly soiled during operation. Here, the reference reading of a reliable sample is converted into the
display value at the operating point. The internal processor then automatically recalculates and corrects
the cell constant “CF”.
ATTENTION
If the “CF” (cell constant) value of 003.0 is exceeded, the warning message
“CF.Hi” will appear.
■
■
The electrode urgently requires cleaning, see page 54.
■
■
Continued operation is possible.
Pay attention to the setting instructions on page 38 / 39 and proceed as follows:
1.
Using a reliable sample, establish a reference reading of the current conductivity at the plant’s
operating point.
2.
Select the parameter “
CAL
”.
First of all, the current cell constant “CF” is displayed.
3.
Press and hold the rotary knob until the current conductivity value flashes on the display.
4.
Set the reference value you previously established (conductivity from the reference sample) as the
new display value.
5.
Save your setting by pressing the rotary knob for approx. 1 second.
Bringing into service