Commissioning procedure
When adjusting the measuring range when the system is cold, the adjusted measuring
points will shift with rising temperature as a result of the longitudinal expansion of the
electrode rod. Correct the settings accordingly.
Note
Please check that the level electrode is wired in accordance with the wiring diagram (Fig. 10, 11) and
switch on supply voltage of the connected level switch / controller.
Applying supply voltage
The supply voltage can be measured between terminals "3" and "M" in the terminal box o. The
voltage should be 12 V DC. If this voltage is not present, check the connected level switch / level
controller.
The level-proportional voltage UM can be measured between terminals "1" (+) and "M" (–).
Raise level in vessel to the highest point (completely submerged) of the selected (active) measuring
range (e. g. 1000 mm) and measure the voltage.
Compare the value measured with the value of the corresponding chart (in diagram u UM for 1000 mm
is 4.6 V). The following values must be obtained in any case:
Level electrode completely exposed: UM ≥ 0 V, level electrode completely submerged: UM ≤ 7 V DC
If the electrode is submerged and you measure UM = 0 V or UM > 7 V DC, replace the level electrode.
Checking measuring voltages
Checking measuring range
Before commissioning the level electrode make sure that the active measuring range (= control range)
agrees with the service conditions of your installation.
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