Bühler technologies Nivotemp NT-M Series - Adjusting the Level Contacts

Nivotemp NT-M
4.3 Adjusting the level contacts
(not available for type NT M-MS-OV-M3… with temperature contact or Pt100)
The contacts for level measurement are locked into a bent rail inside the protective tube. They are positioned as specified in the
purchase order, but can be moved to any position if necessary.
For devices with 230 V mains voltage:
DANGER Electrical voltage
Electrocution hazard.
a) Disconnect the device from power supply.
b) Make sure that the equipment cannot be reconnected to mains unintentionally.
c) The device must be opened by trained staff only.
d) Regard correct mains voltage.
– Disconnect the voltage supply.
– Disconnect the plug.
– Carefully pull the bent rail with contacts out the top.
NOTICE
On versions with earth wire, this is run as a loop and soldered to the protective tube
from the inside in the insertion direction. To prevent breaking off the earth wire it
should not be pulled all the way out.
– Mark the original contact position.
NOTICE
Never attempt to remove the contacts from the front of the bent rail, as this will damage
the glass body. Do not pull on the cables.
– Carefully slide the contacts to the desired position on the bent rail. Use a small screwdriver or similar tool to do so. Use a drop
of oil if the contacts are very tight. Please note the minimum spacing!
If the contacts are configured as NO contact (NO) or NC contact (NC), the contact function can be reversed by turning the con-
tacts 180°. The housing has symbols for NC contact and NO contact as well as an arrow. The arrow, which points up when in-
stalled, indicates the current contact function. The contact logic assumes the level switch is installed in an empty tank, i.e. it is
only in the operating position once filled.
Function NC contact
with falling level (NO)
Function NO contact
with falling level (NC)
Red marking down
Red marking up
– To reverse the switching function, slide the contact out the top or bottom of the bent rail, turn 180° and slide back in, and
slide into the desired position.
– If the earth wire was pulled out of the protective tube, first insert this wire into the protective tube.
– Make a loop of the additional cable length and carefully slide the bent rail back in.
9Bühler Technologies GmbHBE100021 ◦ 03/2017