NBK-M
The float must pass the switch once in both directions so that the switching
function is in line with the wiring diagram and table on page 10.
Note that the switch cable must point downwards.
These instructions are often ignored when an alarm lamp is connected and it is
assumed that the switch is damaged.
When the switch has passed in both the directions, it is ready for operation and
requires no maintenance.
Hysteresis
Hysteresis is the difference between contact closing
and opening points. A hysteresis of approximately
15 mm float movement is achieved by factory tuning of
the float magnet and the contact.
9. Trouble Shooting
Error: The tank is full but there is no indication
Check that the float is present in the system.
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If the float is present, check whether it is being blocked by foreign objects or
dirt deposits.
Check the op. SG of the float and the medium if the liquid density is too low for
the float it will sink and not provide indication.
Error: The tank is full but the indication is too low.
Check that the density of the liquid is in accordance with the density prescribed
on the indicator nameplate.
Check that the float has been correctly installed.
Check if dirt deposits in the over-head tube are blocking the float.
Page 10
NBK-M_manual_3-5-04.doc