Bühler technologies Nivotemp NT 61D Notice De Montage page 11

Nivotemp NT 61D, Nivovent NV 71D
The maximum values specified for the respective contact
types apply.
Level contact with reed switches can therefore be used for SPS
applications as well as for high loads (within the maximum
limits) without hesitation.
Contact material
All reed switches in Bühler level contacts use rhodium as the
contact material for the actual contact areas.
Magnetic fields
Avoid external magnetic fields, including from electric mo-
tors. These can interfere with the function of the reed
switches.
Mechanical loads
Do not expose the level switch to strong blows or bending.
4.4 Adjusting the level contacts
The level measurement contacts are mounted on a perforated
rail inside the protective tube. These are arranged per order
specifications but can be moved if necessary.
• Disconnect the voltage supply.
• Disconnect the plug.
• Models NT61D: Remove the two screws on the flange
cover.
• Models NV71D: Remove filter cover and element. Unscrew
and remove the filter case. Unscrew the flange cover from
the level switch.
• Carefully pull the perforated rail with contacts out the
top.
• Mark the original contact position.
• Lock the contacts in place in the desired positions. Please
note the minimum spacing!
If the contacts are configured as NO contact (NO) or NC con-
tact (NC), the contact function can be reversed by turning the
contacts 180°. The housing has symbols for NC contact and NO
contact as well as an arrow. The arrow, which points up when
installed, 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 NO contact (NO)
with rising level
• Make a loop of the additional cable length and carefully
slide the perforated rail in again.
• Models NT61D: Screw on the flange cover.
• Models NV71D: Screw on the flange cover. Screw on the fil-
ter case. Attach the filter cover and element.
NOTICE
Ensure the seals are positioned correctly. Replace defective
seals immediately!
BX100017 ◦ 02/2024
5 Operation and control
The device must not be operated beyond its specifications.
5.1 Start-up procedure
The device will automatically switch on when connected to
power. It will first briefly display the software version, at
which time the device will also check the built-in components.
The display will then switch to displaying measurements.
The following describes the function of the display and control
unit:
Control keys
If an error message appears in the display during operation,
please refer to the Troubleshooting table under chapter "Ser-
vice and Repair".
5.2 LED statuses
LEDs above the measurement display indicate the status of
the temperature switching outputs. The LEDs are perman-
ently assigned to the switching outputs.
The following table shows the factory settings:
The switching characteristics of the LED (on if switching con-
tact closed or open) can be changed.
5.3 General key functions
The keys below the display are used for operation.
Function NC contact (NC)
The menu controls are detailed in the following chapters.
with rising level
Key
NOTICE
LEDs
LED 1 – yellow
Status switching output 1
LED 2 - red
Status switching output 2 (if applicable)
LED 3 – yellow
Status switching output 3 (if applicable)
LED 4 – red
Status switching output 4 (if applicable)
Mode Function
• Measurement Change measured variables dis-
display: played.
Move down one menu level.
• In the menu:
Move up one menu level.
• At the end of
the menu:
The display indicates the end of
the menu.
Display
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