Bühler technologies Nivotemp NT 64D Notice De Montage page 12

Nivotemp NT 64D, Nivovent NV 74D
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
(only yellow + green, max. 2 level contacts)
Pt100
Change the contact function NC/
NO by turning the contacts 180°
NOTICE
Only tighten the plastic screw at maximal 5 cNm!
The contacts required for the float are mounted to a galvanic-
ally gold-plated with cm scale with plastic screws. The contact
housings have different colours and may only be mounted to
the contact strip in the following order.
Top to bottom:
Any other order may result in malfunctions.
The level contacts are arranged per order specifications at the
factory but may later be moved along a 10 mm (0.4") grid. The
falling NC contact (NO) or falling NO contact (NC) contact
function may also be changed by turning the contact hous-
ings 180°. The housing has two arrows. The arrow pointing up
indicates the current contact function.
Function NO:
NO contact with rising level
= NC contact with falling level
The contact logic assumes the level switch is installed in an
empty tank, i.e. it is only in the operating position once filled.
The reference point for the level switching point is at the
middle of the EASYJUST level contact.
NT64D:
• Disconnect the voltage supply.
• Disconnect the plug.
• Unscrew the display housing with base and carefully pull
out the top along with the adapter plug and the contact
strip.
12 Bühler Technologies GmbH
Contact strip with
10 (adjustability)
cm scale
Cordless (bistable) level contacts
Function: falling NO contact (NC) or falling
NC contact (NO)
NC contact / NO contact
Green
Yellow
Function NC:
NC contact with rising level
= NO contact with falling level
• Loosen and reposition the plastic screws on the contacts
(cm scale on the back of the contact strip). Minimum spa-
cing: 40 mm (1.6").
• If necessary, turn 180° to change the contact function.
• Tighten the plastic screws for fastening the contact.
Please note the maximum torque (max. 5 cNm).
• Slide the contact strip back into the protective tube and
screw on the display housing with base.
NOTICE
Ensure the seals are positioned correctly. Replace defective
seals immediately!
Example:
1 Plug connection M12
2 Display housing
3 Base
4 Adapter plug
5 Plastic screws
6 Level contacts
NV74D:
• Disconnect the voltage supply.
• Unscrew the filter cover and remove the filter element.
• Loosen the mounting screws and remove the filter case.
• Loosen the screws for the flange cover and remove the
cover with cover seal.
• Disconnect the adapter plug from the contact strip and
carefully pull the contact strip out the top.
• Loosen and reposition the plastic screws on the contacts
(cm scale on the back of the contact strip). Minimum spa-
cing: 40 mm (1.6").
• If necessary, turn 180° to change the contact function.
• Tighten the plastic screws for fastening the contact.
Please note the maximum torque (max. 5 cNm).
• Slide the contact strip back into the protective tube.
• Reattach the adapter plug to the contact strip the right
way. The markings on the adapter flange and the contact
strip must overlap.
• Fasten the flange cover incl. seal.
• Secure filter case, insert filter element and screw on filter
cover.
NOTICE
Ensure the seals are positioned correctly. Replace defective
seals immediately!
7 Contact strip
8 Pt100
9 Flange
10 Switching tube
11 Float
BX100018 ◦ 02/2024