SGB DL 100, Manual, Page: 30 / 49

ANNEX FC
OVERPRESSURE LEAK DETECTOR DL..
Dry filter monitoring (FC)
1 Function
A sensor is integrated in the suction line of the pump between pump and dry filter to measure
the moisture of the air intake.
The sensor registers the increase in relative humidity when the desiccant is spent. The optical
and audible alarm is triggered together with the potential-free message when the drying capac-
ity is insufficient.
The visual indication consists of alternate flashing of the two red alarm LEDs. The potential-free
indication is present at terminals 31 to 34:
31/32
Contact opens on receiving a message
31/34 Contact closes on receiving a message
2 Changing the drying material
When getting the indication "dry filter spent", the drying material should be replaced after an
appropriate period of time.
The audible signal can be acknowledged by pressing briefly once. The visual and potential-free
indication remains.
The entire indication can be acknowledged by pressing and holding the button "Acknowledge
dry filter message" (until the lower LED flashes). Next time the pump starts up (or if this function
is carried out while the pump is running, after approx. 30 s), the indication is triggered again if
the residual moisture is too high.
After replacing the drying material, quit the indication by pressing and holding the button as
described above.
3 Limits of use
The following limits of use must be observed for the dry filter monitoring function:
1. The pump must run min. 30. sec to obtain a meaningful statement.
During or after start up of the leak detector, the time between pump ON and OFF should be
measured to check whether this minimum operating time is achieved.
2. No meaningful measuring results are obtained at low temperatures (below -5°C) so that the
measurement is deactivated below -5°C.
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