44
LRG 1x-6x - Installation & Operating Manual -
819878-00
Replacing faulty equipment
Faulty equipment jeopardises system safety.
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If numbers or decimal points are displayed incorrectly or not at all, you must replace the
conductivity electrode with an identical one from GESTRA AG.
Changing the cell constant
Notes on adjusting the cell constant
The cell constants of each LRG 1x-6x conductivity electrode is finely adjusted ex works. If the installation
situation at the installation location makes a readjustment necessary, (see page 48, comparison of the
measured value with a reference measured vale), the cell constant can be changed on site.
Requirements for performing the readjustment:
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There must be a sufficient boiler fill level to compare the cell constants.
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The comparison with a reference measurement may only be performed at a low boiler output in order
to minimise distortion from steam bubbles.
By means of this parameter, the display value can be correlated manually with a reference
measured value from a reliable sample at the operation site.
Alternatively, the readjustment can be performed using a convenient solution by means of the “
CAL
”
function; see page 45.
Note the setting instructions on page 40 and proceed as follows:
1.
Select the parameter “
CF
”.
2.
Press and hold the rotary knob until the current value flashes on the display.
3.
Set the desired value ( 0.050 – 5.000 ).
4.
Save your set value by pressing the rotary knob for approx. 1 second.
Increasing the “CF” value causes the display value to increase.
With increased contamination, the display value will have decreased. This is to be compensa-
ted by increasing the “CF” value as described previously in points 1 to 4.
Changing the temperature coefficient
The temperature coefficient of the measuring medium can be adjusted manually as long as a
corresponding value has been determined.
The factory setting of “2.1” is usually set for steam generating units with constant pressure.
For newly implemented electrodes, this value is to be adjusted to the temperature coefficients
of the boiler water if necessary.
Bringing into service