RST DLS-35 - 10 Series, Instruction Manual

Page: 12 / 28

DLS–35 © Dinel, s.r.o. 12
5 . r
ange of application and inStallation of indiVidUal VariantS
DLS–35_–10, 14
Is produced in two versions – with 50 mm or 100 mm electrode. The shorter version (E50) is suitable
for clean non-conductive liquids level sensing (oils, diesel, petrol, etc.). The longer version (E100) is
designed for non-adhesive bulk solid or non-adhesive powder materials (plastic granulates, sand,
sugar, grains, detergents, etc.) and other slightly impure, non-conductive liquids (lubricants, plant
oils). The sensor mounts directly into a vessel or storage tank wall (ideally in the horizontal position)
by means of a welding flange or stainless steel fixing nuts. In case of level sensing of low-permittivity
media in non-metal storage tanks, we recommend mounting the sensor on an auxiliary metal-plate
electrode with min. area of 200 cm
2
. Variant "14" has higher pressure resistance.
DLS–35_–11
Specified for level sensing of conductive liquids (water and water solutions). It can be used to identify
the boundary between different permittivity of fluids (e.g. water – oil). The sensor is mounted directly
into the side wall of a tank or in a pipe (horizontal position) by means of a steel or stainless steel
welding flange.
DLS–35_–20, 23
Designed for limit level detection of bulk solids with low specific weight and permittivity (cement,
hydrated lime, flour), and for materials expected to have changing properties (fly ash, sawdust, feed
mixtures, etc.). It is possible to use it for sensing non-conductive fluids containing a small amount
of water (up to 2%) or other impurities (plant oils, liquid propane, etc.). The sensor is mounted di-
rectly into the wall of a vessel or storage tank using steel welding flanges or fixing nuts horizontally,
slanted from the side or vertically. It is recommended to mount a sensor with an electrode longer than
300 mm only in the vertical position. Hollow spaces should be minimized between the electrode and
the wall where the sensed material can accumulate (see application notes). In case of level sensing
of low-permittivity media in non-metal storage tanks, it is recommended to mount the sensor on an
auxiliary metal-plate electrode with min. area of 400 cm
2
. Variant "23" has higher pressure resistance.
DLS–35_–21, 22, 24, 25
Specified for conductive liquids level sensing (water, water solutions, mud, etc.). It reacts to partial
or full immersion of the electrode (depending on the adjusted sensitivity). The lower the sensitivity,
the higher the sensor's resistance to impurities and clinging remnants of material. The sensor with
electrode length of up to 200 mm can be desensitized to complete water immersion, so it can be
operated in the horizontal position. The sensor can be operated in the vertical position with any length
up to 1 m. The sensor is mounted directly into the wall of the tank in horizontal or vertical position
by applying a steel or stainless steel welding flange. For variant "22", the material PFA is used to
insulate the electrode. This variant is more resistant to aggressive fluids. Variants "24" and "25" have
higher pressure resistance.
DLS–35_–30
Designed for sensing conductive and non-conductive liquids and bulk solids. It is not recommended
to install the sensor into closed vessels (storage tanks) where intensive water vapour condensation
occurs. The sensor reacts to electrically conductive liquids just by touch of the end of electrode. To
react to a non-conductive liquid (bulk solid), it is necessary to have 5 ÷ 20% immersion of the electrode
according to the sensor's adjusted sensitivity and permittivity of the sensed material. The sensor
is mounted directly into the wall of a tank, vessel or sump in slant or vertical position by means of
a welding flange or fixing nut. In non-metal storage tanks, we recommend mounting the sensor on
an auxiliary metal-plate electrode with min. area of 500 cm
2
.