Kelco D50 & D40 Level Switch Calibra
Ɵ
on
The Kelco D50 and D40 level switches are factory calibrated to operate with the displacer or
displacers supplied with each switch. If required, the switch can be re-calibrated by adjus
Ɵ
ng
the calibra
Ɵ
on screw located on the top deck of the switch. The calibra
Ɵ
on screw is an M3 Allen
head stainless grub screw secured with a lock nut and sealed with red enamel.
D50 Level Switch
The D50 level switch is supplied with two displacers. If the D50 level switch fails to operate on
a falling level, that is, fails to switch when the falling water level uncovers the bo
Ʃ
om displacer
then the switch will require re-calibra
Ɵ
on. It such a situa
Ɵ
on unlock the calibra
Ɵ
on screw lock
nut and wind the calibra
Ɵ
on screw ¼ turn an
Ɵ
clockwise and re-lock the lock nut. Test the switch
on a falling water level and ensure it operates properly. If it fails to switch, adjust the sensi
Ɵ
vity
screw a further ¼ turn an
Ɵ
clockwise and repeat the test.
If the switch fails to operate on a rising level, that is, fails to switch when the top most displacer
is covered by water it will require re-calibra
Ɵ
ng. Unlock the calibra
Ɵ
on lock nut and turn the
calibra
Ɵ
on grub screw ¼ turn clockwise and re-
Ɵ
ghten the lock nut. Test the switch on a rising
water level. If it fails to switch when the top displacer is covered by water, wind the calibra
Ɵ
on
screw a further ¼ turn clockwise and repeat the test.
D40 Level Switch
The D40 level switch has a single displacer and switching must occur within the length of the
single displacer. When correctly adjusted the switch should change state at the bo
Ʃ
om edge of
the conical sec
Ɵ
on on a rising level and at the seam line half way down the straight sec
Ɵ
on on
a falling water level. If a rising water level fails to actuate the switch when the displacer is fully
submerged recalibrate the switch by adjus
Ɵ
ng the calibra
Ɵ
on screw clockwise in ¼ turn steps
un
Ɵ
l the switch operates at the correct point.
If the switch fails to operate on a falling water level adjust the calibra
Ɵ
on screw an
Ɵ
clockwise by
¼ turn and retest it. If required repeat the adjustment un
Ɵ
l the switch operates properly.
Calibration adjustment screw and lock nut (M3)
