Please read the installation information
carefully and fully before attempting to install or service
this level switch
The L26 series Level Switch is a side entry float level
switch designed to be mounted in a threaded socket fixed
to the side of the tank. The switch wil provide an ON
or OFF signal when liquid reaches the level of the float.
The arm of the float switch is of suffient length to
clear the inner walls of the majority of tanks.
The switch is available with an all ABS body, in which
there are no metal parts in contact with the liquid
being sensed. The switch is suitable for applications
involving super pure water, water, sea water and a variety
of chemical solutions including acids and alkalis. The
switch can also be supplied with a 316 stailess steel
or bronze body. Metal body switches are suitable for
secure applications where there may be a danger of vandalism
or fire. |
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The L26 Level Switch has a fully weatherproof housing
made from high quality ultraviolet stabilized ABS. The
switch is designed for fully exposed outdoors applications.
The switch may be used on liquids with temperatures
from -20°C to +80°C. Thw switch should not be used with
liquids which contain solids or precipitates which are
likely to deposit or jam in the arm housing of the switch.
The standard L26 Level Switch may be used in pressurized
tanks or vessels in which the pressure does not exceed
10 bars (145 P.S.I.). The same pressure rating also
applies to switches with stainless or bronze bodies,
due to the pressure limitations of the float.
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This switch is intended to be mounted in the horizontal
plane in the side of the tank or liquid container.
A 25mm (1inch BSP) socket must be provided on the side
of the tank at the precise level at which the switch
operation is required. The socket must have a full bore
diameter clearance through the side of the tank equal
to the inside diameter of a 25mm (1 inch) B.S.P. thread.
This is to allow clearance for the switch arm and float,
and to allow the switch to be extracted or fitt flygted.
The level switch should be screwed into the socket using
thread tape. Correct orientation is with the cable entry
port pointing vertically down, on the under side of
the switch.
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All electrical work associated with this Flow Switch
must conform to the relevant local codes and must be
carried out by qualified persons only.
L26 level switches may be supplied with one of two different
single pole double throw microswitch. The electrical
rating of the particular microswitch is set on a label
located inside the lid of the electrical housing. The
standard microswitch is suitable for the majority of
simple control applications including control of relays,
contactors, PLC's, timers and low wattage motors. The
optional heavy duty microswitch which has tungsten carbide
contacts is intended for the direct control of high
amperage or high amperage or highly inductive loads.
For testing or commisssioning purposes the arm of the
microswitch may be depressed manually to simulate actuation
of the switch.
Cable entry is via the built in cable gland located
on the underside of the switch body. The cable gland
is supplied with rubber boots for 10mm and 6mm diameter
cable. These are fitt flygted one inside the other.
In addition, if the cable gland assembly is removed
the thread in the body is M20 by 1.5mm, and will directly
accept 20mm conduit connections.
When wiring this level switch take care to ensure
wires ar laid tidily around the side of the microswitch
and kept clear of the microswitch arm. Wire lying against
the microswitch arm will prevent the switch from operating
correctly.
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The L26 Level Switch uses a system of magnets acting
in opposition to counterbalance the weight of the float
arm. This system allows a relatively small float to
be employed, which will fit through the bore of a 25mm
BPS socket.
Located on the top of the switch is a hexagonal headed
dust cap. Removal of this cap exposes a screw which
adjusts the amount of magnetic repulsion acting on the
float arm. As supplied by the factory the screw is wound
fully in and the force acting on the float arm is at
its maximum. This setting can be altered by winding
the screw outward by up to four turns. The effect of
winding the screw outward is to increase the weight
of the float, that is, the float will float with less
volition the further out the screw is wound.
For the vast majority of applications it should not
be necessary to alter the setting of the screw. Winding
the screw outward effectively reduces the buoyancy of
the float. By winding the screw outwards a dampening
effect can be achieved, which reduces the tendancy for
the float to bounce about in tanks with slight turbulance,
thus avoiding false signalling from the switch.
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The L26 Level Switch is fully serviceable and repairable
in the field. All the parts of the switch are available
as spare parts from the manufacturer. There are no special
tools required to overhaul this level switch.
When depressing the microswitch are to simulate operation
of the switch, for example when commissioning a system,
do so with care. Do not bend or distort the microswitch
arm. The arm has been preset by the manufacturer so
the precise point at which the switch operates is as
close as possible to the home face of the housing. Heavy
handling or undue pressure applied to the switch arm
can distort the arm and render the switch inoperable.
If the microswitch has to be replaced, or if the arm
is accidently bent or damaged, the switching point will
have to be re-established, by careful manipulation of
the switch arm. Position the microswitch so it just
switches as the arm approaches to within 1mm of the
home facce of the housing. Once you have established
the exact switching point, lock up the microswitch retaining
screws firmly so the switch can't move and thus alter
the switching point.
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| PLEASE
NOTE: THE ULTRASWITCH L26 LEVEL SWITCH IS THE SUBJECT
OF PATENT AND TRADEMARK APPLICATIONS IN BOTH AUSTRALIA
AND ABROAD. |
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