Fluidcontrol
Level- and temperature
switch
Nivotemp NT 64, NT 64D
DE100209
05/2024
page 1 / 8
Bühler Technologies GmbH, Harkortstr. 29, D-40880 Ratingen
Tel. +49 (0) 21 02 / 49 89-0, Fax: +49 (0) 21 02 / 49 89-20
E-Mail: fluidcontrol@buehler-technologies.com
Internet: www.buehler-technologies.com
In hydraulics and lubrication technology the fill level of oil tanks
needs to be monitored continuously. Here, modern factory
automation requires compatible signals. Despite central system
control, visualising the current level on the actual tanks is often
desired. To minimise production costs and the space required
on containers, it makes sense to use one monitor for both e.g.
the fill level and oil temperature. The Nivotemp series meets
virtually all requirements arising in this area of application.
NT 64
Connecting flange as per DIN 24557 Part 2
Wireless, adjustable level contacts
Various plug options
Up to 4 switching outputs for liquid level or 2 switching
outputs for liquid level plus Pt100 or analog output for
temperature
Proven and tested highly dynamic float system
24 V DC standard, 230 V DC upon request
NT 64D
LED display with status of switching outputs, 270° swivel
Standard menu structure based on VDMAstandard sheet
24574 ff.
2 wireless, adjustable level contacts
Up to 4 programmable temperature switching outputs
Alternatively, continuous temperature output signal plus one
freely programmable switching output
Characteristics of switching output configurable as window or
hysteresis
Two switching outputs configurable as frequency output
(1-100Hz)
Min/max memory, logbook function
Nivotemp NT 64, NT 64D
Technical Data NT 64
Basic unit
Version MS VA
Basic model
last
contact
1st contact
Ø50 (MS)
Ø60.3 (VA)
65
L
L2 = min. 80
L1 = min. 40
with VA stilling
tube
3.5
min. 60
G1 cork
seal
Stilling tube optional
Ø44
4
8
Flange drawing
Ø60*
6x Ø6
Ø73
Ø90
*min. Ø61 for VA version with
stilling tube
SK 221 Float
min. Ø60
min. 55*
last contact
* min. 80 with temperature
Ø51
3.5
57
min. Ø61 with stilling tube
Operating pressure max. 1 bar max. 1 bar
Operating temperature -20 °C to +80 °C -20 °C to +80 °C
Float SK 610 SK 221
Min. fluid density 0.80 kg/dm³ 0.85 kg/dm³
Lengths 280, 370, 500 mm (standard)
Material/Version
Float rigid PU (SK 610) 1.4571 (SK 221)
Immersion tube Brass 1.4571
Flange (DIN 24557) PA PA
Weight at L=280 mm
Each 100 mm add
approx. 200 g
approx. 30 g
approx. 300 g
approx. 50 g
Includes:
Mounting screws (quantity 6) and rubberised cork seal.
Options
Stilling tube (SSR) Brass VA
Level switching output K101-104 W101/102
Function NO/NC* Change-over contact
Max. number 4 2
Voltage max. 30 V DC 30 V DC
Switching current max. 0.5 A 0.5 A
Contact load max. 10 VA 20 VA
Min. contact spacing 40 mm 40 mm
*NO= falling NC contact/NC = falling NO contact
Optional temperature output
Temperature contact TK
Voltage max. 30 V DC
Switching current max. 2.5 A
Contact load max. 100 VA
Function NC* NO*
Switching point °C 50/60/70/80 50/60/70/80
Switching point tolerance ± 3 K ± 3 K
Hysteresis max. 10 K ± 3 K 10 K ± 3 K
*
NC = NC contact/NO = NO contact, data for rising temperature
Temperature sensor
Pt 100 Class B, DIN EN 60 751
Tolerance ±0.8 °C
Temperature transmitter KT
Temperature sensor Pt 100 Class B, DIN EN 60 751
Measuring range 0 °C to +100 °C
Supply voltage (U
B
) 10 - 30 V DC
Output 4 - 20 mA
Burden Ω max. =(U
B
-7.5 V)/0.02 A
Accuracy ± 1 % from end value (in the medium)
Other measuring ranges available upon request
2 Bühler Technologies GmbH We reserve the right to amend specification. DE100209 ◦ 05/2024
Nivotemp NT 64, NT 64D
Ordering instructions NT 64
Model key
Model designation
Version
MS
VA
Brass
float / VA immersion tube
Plug connector
M3
S6
M12
2M12
Length in mm
280
370
500
Stilling tube
Level measurement
1-4
Number of contacts
K
W
NC/NO
change-over contact
Temperature signal
NT 64
Optional
SSR
Level contacts
Please specify position and switching function per model
key, example: L1 = nnnmm NC
TK...
NC contact
NO contact
TK50NC
TK60NC
TK70NC
TK80NC
TK50NO
TK60NO
TK70NO
TK80NO
= 50 °C
= 60 °C
= 70 °C
= 80 °C
Pt100
KT
Temperature sensor
Temperature transmitter
1)
1)
----
----
-nn-nn
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Accessories
Item no. Description
9144050010 Connecting cable M12x1, 4-pin, 1.5 m, angular coupling and straight plug
9144050046 Connecting cable M12x1, 4-pin, 3.0 m, angular coupling and straight plug
9144050047 Connecting cable M12x1, 4-pin, 5.0 m, angular coupling and strands
Ordering example
You require: Level switch with flange, brass, plug connector S6, length L = 500 mm, 2 level contacts and temperature contact
TK 80 as NC contact, 1st contact 100 mm NC, 2nd contact 420 mm NO
Order: NT 64-MS-S6-500-2K-TK80NC, L1=100 NC, L2=420 NO
Standard pin assignment NT 64
Plug connection
M3 S6 M12 (base) 2M12 (base)
Dimensions
Number of pins 3-pin + PE 6-pin + PE 4-pin 4-pin / 4-pin
DIN EN 175301-803 175201-804 61076-2-101 61076-2-101
Voltage max. 30 V AC / V DC 30 V AC / V DC 30 V DC 30 V DC
Contact load max. 0.5 A per output 0.5 A per output 0.5 A per output 0.5 A per output
Degree of protection IP65 IP65 IP67* IP67*
Cable fitting PG11 M20x1.5
Max. number of contacts
Level/temp. contacts
1 x K101 / 1 x TK
- / -
3 x K101-104 / 1 x TK
1 x W101/102 / 1 x TK
1 x K101 / 1 x TK
- / -
3 x K101-104 / 1 x TK
1 x W101/102 / 1 x TK
Level contacts only 2 x K101-102
1 x W101
4 x K101-104
2 x W101/102
4 x K101-102
2 x W101
4 x K101-104
1 x W101/102
* with IP67 cable box attached. Other plug connections available upon request.
3Bühler Technologies GmbHWe reserve the right to amend specification.DE100209 ◦ 05/2024
Nivotemp NT 64, NT 64D
M3 S6 M12 (base) 2 x M12 (base)
Connection schematic
3
12
PE
1
PE
2
3
4
5
6
Plug A Plug B
K101-104
Level contact(s)
W101/102
Level contact(s)
K101-104
Level contact(s) and
Pt100
W101/102
Level- and temperature
contact(s)
The standard assignment specified here applies to the max. number of contacts possible and contact function NO.
4 Bühler Technologies GmbH We reserve the right to amend specification. DE100209 ◦ 05/2024
Nivotemp NT 64, NT 64D
Technical Data NT 64D
Basic unit
Version MS VA
Basic model
L1 = min. 40
L
L2 = min. 80
min. 60
Contact spacing = min. 40 mm
12
116
Gl cork
seal
3.5
5
Stilling tube
with centring
disc
Ø51 (MS)
Ø60.3 (VA)
last contact
SSR
1st contact
4
Housing swivels 270°
Flange drawing
Ø60
6x Ø6
Ø73
Ø90
SK 221 float for NT 64D-VA
Operating pressure max. 1 bar max. 1 bar
Operating temperature -20 °C to +80 °C -20 °C to +80 °C
Float SK 610 SK 221
Min. fluid density 0.80 kg/dm³ with float 0.85 kg/dm³ with float
Lengths 280, 370, 500 mm (standard)
Material/Version
Display housing PA PA
Float rigid PU 1.4571
Immersion tube Brass 1.4571
Flange (DIN 24557) PA PA
Weight at L=280 mm
Each 100 mm add
approx. 300 g
approx. 30 g
approx. 400 g
approx. 50 g
Degree of protection IP65 IP65
Includes:
Mounting screws (quantity 6) and rubberised cork seal.
Options
Stilling tube (SSR) Brass VA
Temperature display electronics
Display 4 character 7 segment LED
Operation Via 3 keys
Memory Min. / Max. Data memory
Starting current input approx. 100 mA for 100 ms
Current input during operation approx. 50 mA (without current- and switching outputs)
Supply voltage (U
B
) 10 – 30 V DC (nominal voltage 24 V DC)
Ambient temperature -20 °C to +70°C
Display units Temperature °C / °F
Display range -20 °C to +120 °C
Alarm setting range 0 °C to 100 °C
Display accuracy ± 1 % from end value
Temperature sensor
Pt100 Class B, Din EN 60751
Level switching output K10
Max. number 2
Function NC / NC*
Voltage max. 30 V DC
Switching current max. 0.5 A
Contact load max. 10 VA
Min. contact spacing 40 mm
*NO= falling NC contact / NC = falling NO contact
5Bühler Technologies GmbHWe reserve the right to amend specification.DE100209 ◦ 05/2024
Nivotemp NT 64, NT 64D
Temperature outputs
Choose from the following temperature outputs
-2T -1T-KT -4T
Plug (base) 2 x M12 – 4-pin 2 x M12 – 4-pin 1 x M12 – 4-pin
1 x M12 – 8-pin
Switching outputs
2 x freely programmable* 1 x freely programmable* 4 x freely programmable
max. switching current** 0.5 A per output
continuous short-circuit
protected
0.5 A per output
continuous short-circuit
protected
0.5 A per output
continuous short-circuit
protected
Contact load max. 1 A total max. 1 A total max. 1 A total
Analogue output 1 x 4 – 20 mA, 2- 10 V
0-10 V, 0-5 V
Max. burden Ω
as current output
= (U
B
-8 V) / 0.02 A
Min. input load
as voltage output
10 kΩ
Options
Stilling tube (SSR) Same material as immersion tube
*also programmable as frequency output
**Output 1 max. 0.2 A.
Ordering instructions NT 64D
Model key
Type drawing, with display
Temperature measurement
2T
4T
1T-KT
2x PNP switching output
4x PNP switching output
1x PNP switching output
1x analogue output
Version
MS
VA
Brass
float and VA immersion tube
Plug connector
2xM12
Length in mm
280
370
500
Level measurement
1K
2K
1x K10
2x K10
2nd level contact
nn Please specify installation
dimensions (L2 in mm)
Please specify installation dimensions (L1 in mm)nn
1st level contact
NT 64D
falling NC contact
falling NO contact
NO
NC
Switching function 2nd contact
falling NC contact
falling NO contact
NO
NC
Switching function 1st contact
-nn
-nn
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Accessories
Item no. 4-pin Item no. 8-pin Description
9144050010 9144050048 Connecting cable M12x1, 1.5 m, angular coupling and straight plug
9144050046 9144050049 Connecting cable M12x1, 3.0 m, angular coupling and straight plug
9144050047 9144050033 Connecting cable M12x1, 5.0 m, angular coupling and strands
Ordering example
You require: Level switch with flange, brass, plug connector S6, length L = 500 mm, 2 level contacts and temperature con-
tact TK 80 as NC contact, 1st contact 100 mm NC, 2nd contact 420 mm NO, with temperature display and
2 x programmable temperature output
Order: NT 64D-MS-2M12/500-2K-100NC-420NO-2T
6 Bühler Technologies GmbH We reserve the right to amend specification. DE100209 ◦ 05/2024
Nivotemp NT 64, NT 64D
Standard pin assignment NT 64D
Plug connection
2 x M12 (base)
Panel plug
Connection schematic Plug A
(level)
Plug B
(Temperature)
2T Pin
2 x temperature output 1
2
3
4
+24V DC
S2 (PNP)
GND
S1 (PNP)
1T-KT Pin
1 x Temperature output
1 x Analogue output
1
2
3
4
+24 V DC
Analogue (out)
GND
T1 (PNP)
Connection schematic
4T Pin
4 x Temperature output
1
2
3
4
5
6
+24 V DC
S2 (PNP)
GND
S1 (PNP)
S3 (PNP)
S4 (PNP)
7Bühler Technologies GmbHWe reserve the right to amend specification.DE100209 ◦ 05/2024
Nivotemp NT 64, NT 64D
easyjust System
Pt100
Change the contact function NC/
NO by turning the contacts 180°
Cordless (bistable) level contacts
Function: falling NO contact (NC) or falling
NC contact (NO)
10 (adjustability)
Contact strip with
cm scale
Using adjustable level contacts allows the use of standardised immersion tube lengths for different size and shape oil tanks.
The switching points can always be configured to the specific system requirements without first having to purchase a specific
level switch.
This aids original equipment manufacturers and operators with project planning and logistics.
Since the level contacts are electric components, they require a connection to the respective circuits. This is typically achieved us-
ing cables which however, particularly in the case of multiple contacts, makes adjustments more difficult.
The Easy Just System is based on a wireless contact arrangement.
These are enclosed by different coloured housings and are arranged on a carrier board with gold contact points.
The different colours aid with coding the various contacts and ensure the terminal configuration matches the connectors.
The switching function of the contacts (NO or NC) is determined by turning the contact sleeve 180° on the carrier board.
Depending on the option selected, a fixed temperature switch (bi-metal, NO or NC), Pt 100 or 4-20 mA transmitter will be fixed
to the bottom end of the board for temperature monitoring.
8 Bühler Technologies GmbH We reserve the right to amend specification. DE100209 ◦ 05/2024