KELCO D40 User manual

INSTALLATION AND OPERATING INSTRUCTIONS FOR
KELCO D40 DISPLACEMENT LEVEL SWITCH
The D40 top entry level switch operates by Archimedes
principle. When an object is immersed in a liquid its weight
is reduced by an amount equal to the weight of the liquid it
displaces. In the D40 level switch a magnetically actuated
switch detects the weight reduction that occurs when liquid
submerges a solid Polypropylene displacer suspended from
a cord below the switch. Since it is the change of weight
sensed by the displacer as it is submerged that actuates the
switch, the specific gravity of the liquid will directly effect the
operation of the switch. The D40 level switch will only
operate in liquids that have a specific gravity that is 0.95 or
greater (water). They will not operate if used in liquids with
an S.G. of less than 0.95.
The D40 level switch is an extremely versatile device. It can
be used to detect a liquid level in wells, tanks, pits, sumps,
bores and bund areas. The inert materials of construction
mean the switch can be used in water, sea water, mild acids
and in many common chemical solutions. The D40 is highly
tolerant of liquids containing solids, slurries or pulp. It will
also work reliably in froth or foam and in applications where
there is floating scum or debris of various kinds.
The electrical enclosure on the D40 level switch is sealed
and separated from the switch’s actuating arm by a solid
metal wall. The switch is actuated magnetically through the
solid wall. This means the electrical housing is totally sealed
and weatherproof provided the lid is fully tightened and the
cable gland is properly utilised. The Polypropylene
suspension cord and the displacer are the only components
in contact with the process liquid. Polypropylene is a very
inert material and is well known for its resistance to many
commonly encountered chemicals.
The D40 is ideal for warm liquid applications provided the
electrical head is mounted well above the liquid and is
protected from hot vapour. The wetted components, the
cord and displacer are highly tolerant of liquids at elevated
temperatures.
INTRODUCTION INSTALLATION
OPERATING ENVIRONMENT
The D40 level switch is supplied with a flat mounting plate
for installing the switch against the walls of pits or tanks. In
addition to the flat plate, an angle bracket is also supplied.
The angle bracket can be used to mount the switch on any
flat horizontal surface such as tank lids or horizontal bracing.
M5 threaded mounting holes are provided in the sides of the
switch body so the switch can be oriented with its cable entry
pointing to the right or left.
Whichever mounting bracket is used, ensure that once
installed, the top face of the D40’s lid is perfectly horizontal.
This ensures the cord and displacer hang vertically beneath
the switch and apply force to the switch arm directly
downwards.
Thread the supplied cord through the hole at the end of the
switch actuating arm and tie a double knot in it so the cord
can’t pull back through the hole. Thread the free end of the
cord through the hole in the top of the displacer and tie it off
securely. D40 level switch is supplied with 3 metres of cord.
Cords up to 20 metres in length can be used with the D40
switch and are available from Kelco or your supplier if
required.
TYPICAL INSTALLATIONS
Fixed switching differential 40mm +/- 5mm
Maximum distance
between D40 & displacer. 20 metres (3m of cord is supplied with the switch)
Minimum distance from
displacer to the floor of a
tank or sump. 20mm
Minimum inside diameter
of pipe housing or shroud. 70mm
Maximum liquid
temperature. 90°C
Specific gravity of process
liquid. 0.95 or greater
LIMITATIONS
20mlong
115

The D40 level switch houses a S.P.D.T (Single Pole Double
Throw) switch. The standard switch is suitable for all general
control circuit applications up to 500VAC. It is ideal for the
control of pump starters, relay logic circuits, and for the
direct control of contactors and timers. The standard switch
can operate at ANY voltage from 5 to 500VAC. It is rated to
directly control motors up to 1.5kW (2HP).
EARTHING THE D40
ELECTRICAL
KELCO Engineering Pty Ltd
ABN 20 002 834 844 Head office and factory: 9/9 Powells Road Brookvale NSW 2100 Australia. Postal Address: PO Box 7485 Warringah Mall Post
Shop Brookvale NSW 2100 Australia. Phone: [phone] Fax: [phone] Email: [email protected] Web: www.Kelco.com.au
PLEASE NOTE: Kelco Engineering Pty Ltd reserves the right to change the specification of this product without notice. Kelco Engineering Pty Ltd accepts no liability for personal injury or economic loss
as a consequence of the use of this product. All rights reserved copyright Kelco Engineering Pty Ltd © 2018 The Kelco D40 Displacer Level Switch is protected by a 12 month return to base warranty. Full
details of our warranty can be downloaded from: http://www.kelco.com.au/warranty
An M4 earth screw is provided inside the lid of the D40 level
switch. In the interests of safety, all applications should be
properly earthed using the earth screw.
CABLE ANCHOR
Each D40 level switch is shipped with two cable crimps to
suit various cable sizes. A cable crimp should be crimped
onto the outer sheathing of the cable at least 5mm back from
the end of the outer sheathing. The cable should then be
pulled back through the cable gland until the cable crimp
rests hard up against the inner wall of the cable gland. After
bedding the cable crimp into position, fully tighten the cable
gland.
Note:
To switch ON when a rising water level covers the
displacer use terminals 1 (COM) and 3 (NO)
To switch ON when a falling water level uncovers the
displacer use terminals 1 (COM) and 2 (NC)
Note: Do not apply maximum voltage at maximum current across the
switch contacts. See main data table for current limits at specific
voltages and for specific loads.
RATED
VOLTAGE NON INDUCTIVE LOADS INDUCTIVE LOADS
RESISTIVE
LOAD LAMP LOAD INDUCTIVE LOAD MOTOR LOAD
NO NC NO NC NO NC NO NC
125 VAC 20 A 7.5 A 20 A 12.5 A
250 VAC 20 A 7.5 A 20 A 8.3 A
500 VAC 15 A 4 A 10 A 2 A
8 VDC 20 A 3 A 1.5 A 20 A 12.5 A
14 VDC 20 A 3 A 1.5 A 15 A 12.5 A
30 VDC 6 A 3 A 1.5 A 5 A 5 A
125 VDC 0.5 A 0.5 A 0.05 A 0.05 A
250 VDC 0.25 A 0.25 A 0.03 A 0.05 A
WARNING
Pleasereadtheseinstallationandoperatinginstructions
fully and carefully before installing or servicing this
level switch. The D40 level switch is a mains voltage
device. Death or serious injury may result if this switch
is not correctly installed and operated. All electrical
work associated with this switch must be performed by
a fully qualified and licenced electrician.
If this switch is to be mounted in an outside location, for
example on top of an open water tank, we recommend the
cordanddisplacersaswellastheelectricalleadbeprotected
from direct exposure to the sun. A simple shroud can be
constructed from a length of 50mm or larger PVC pipe.
Stand the pipe on end in the tank and mount the D50 so its
displacers and cord sit inside the open pipe and are thus
protected from the sun. The electrical lead to the switch can
be protected from the sun using a siutable length of conduit.
EXPOSED APPLICATIONS
CABLE GLAND ASSEMBLY
Maximum Switched Voltage 500VAC
Maximum Switched Current 15A
Minimum Switched Voltage 5VDC
Minimum Switched Current 160mA