Tecfluid LD61R - Manual (Page 7)

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5. OPERATION
The LD61R can be installed as a detector of minimum or maximum level. To do that, it has
a switch inside the cover. Furthermore, the instrument has a LED that indicates the relay
ststus.
With the switch in the maximum level position, the common contacts of the relays are in
“normally open” when the detector is not in contact with the liquid (level below the
detector), and change to “normally closed” when the detector is submerged. The LED
changes from green to red.
With the switch in the minimum level position, the common contacts of the relays are in
“normally open” when the detector is in contact with the liquid (level above the detector),
and change to “normally closed” when the liquid falls below the detector. The LED
changes from green to red.
6. MAINTENANCE
The life of the vibrating fork depends basically on the abrasive characteristics of the
product used.
The LD-61 level switch only needs maintenance when the product, which can adhere to
the tines, will not let the detector change to a non detection state. In these cases the tines
must be cleaned.
6.1 Cleaning
To clean the tines, a brush suitable for removing the incrusted product, must be used .
You should not try to knock off the adhered product from the tines.
During the cleaning process, be careful not to apply force against the tines as this can
bend them and damage the detector beyond repair.
6.2 Fuse
In the event that the fuse blows, this should be replaced with a slow blow “T” fuse, size
Ø5 x 20 mm and 250 mA rating.
Change of
polarity switch
(maximum level) Change of
polarity switch
(minimum level)