GDS–27 GMS
10
5. r
ange
of
aPPlication
GDS –27_ –10
Is produced in two versions – with 50 mm or 100 mm length electrode. Short version (E50) is suitable
for clean non-conductive liquids level sensing (oils, diesel, petrol, etc.). Longer version (E100) is de
-
signed for non-adhesive bulk-solid or non-adhesive powder materials (plastic granulates, sand, sugar,
grains, etc.) and other non-conductive liquids (lubricants, plant oils). Sensor is specified to be mount
-
ed directly into a vessel or container wall (horizontal position) by means of welding flange or stainless
steel fixing nut. In case of level sensing of low-permittivity media in non-conductive containers it is
recommended to mount the sensor on auxiliary metal-plate electrode with min. 200 cm
2
area.
GDS –27_–11
Is specified for limit level sensing of electrically non-adhesive conductive liquids (water and water
solutions). It is possible to use it for detection of boundary between different permittivity liquids (e.g.
water – oil). Sensor is mounted directly into the side wall of the vessel or in a pipe (horizontal posi-
tion) by means of normal or stainless steel welding flange.
GDS –27_–20
Is designed for limit level detection of light-bulk solid materials (plastic granulates) or powder ma-
terials (flour, cement, limestone powder, detergents, etc.) and for materials with variable humidity
(feeding mixtures, wood sawdust, etc.). It is possible to use it for non-conductive fluids with up to 2%
of water (plant oils, liquid propane, etc.). The sensor with electrode longer than 300 mm is recom
-
mended to mount in vertical position only. Sensor is mounted directly into a vessel or container wall
in horizontal (up to E300), slant or vertical position by means of welding flange or stainless steel
fixing nut. We should minimize the hollow spaces between the electrode and the wall where the
material can sediment (see application notes). In case of level sensing in non-conductive containers
it is recommended to mount the sensor on auxiliary metal plate electrode with min. 400 cm
2
area.
GDS–27_–21, 22
Is specified for conductive liquids level sensing (water, water solutions, mud, etc.). It is designed
for horizontal (up to E300) or vertical installation directly in the wall of a vessel. It reacts on partial
or full immersion of the electrode (dependent on adjusted sensitivity). The less is the sensitivity the
better is resistance to an adhered rests of media. Sensor is mountable directly into wall of a vessel
in horizontal or vertical position by means of welding flange.
In the case of vertical mounting it is necessary
to avoid
long fitting tubes
, where could the
vapours condense or some rests sediment.
right figure – wrong, left figure – appropri
-
ate. The similar situation is when the sensing
electrode goes through the concrete ceiling of
the silo. The hole diameter should be at least
50 mm (acc. to the thickness of the ceiling).
All vertically mounted sensors
Fig. 9:
Protective hose install
