Fluidcontrol
Level- and temperature switch
Nivotemp NT 61, NT 61D, NT 61-HT
DE100208
09/2023
page 1 / 11
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 61
Connecting flange as per DIN 24557 Part 2
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
Immersion tube length up to 1.5 m (longer upon request)
suitable for up to 230 V AC/DC (varies by version)
NT 61-HT (used for HFC+HFA oils) for temperatures up to 150°C
NT 61D
LED display swivels 270°
Up to 4 programmable temperature switching outputs
Alternatively, continuous temperature signal plus one freely
programmable switching output)
Characteristics of switching outputs configurable as frequency
output (1-100 Hz)
Standard menu structure based on VDMAstandard sheet
24574 ff.
Min/max memory, logbook function
Nivotemp NT 61, NT 61D, NT 61-HT
Technical Data NT 61
Basic Unit
Version MS VA
Ø50 (MS)
Ø60.3 (VA)
65
L
L2 = min. 70
L1 = min. 30
with VA stilling
tube
3.5
min. 40*
last contact
1st contact
4
8
*min 80 with temperature
Ø44
Rubberised cork seal
Stilling tube optional
min. Ø60
min. 60*
last contact
Ø51
3.5
57
* min. 80 with temperature
Ø60*
6x Ø6
Ø73
Ø90
*min. Ø61 for VA version 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 (all versions) 280, 370, 500 mm (Standard), variable to max. 1500
mm in 10 mm increments
Material/Version MS VA
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. 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 K10 W11
Function NO/NC* Change-over contact
Voltage max. 230 V AC/DC 48 V AC/DC
Switching current max. 0.5 A 0.5 A
Contact load max. 10 VA 20 VA
Min. contact spacing 40 mm 40 mm
Contact position in 10 mm increments
*NO = falling NC contact / NC = falling NO contact
Temperature contact TK TM
Number of temp. contacts 1 2
Voltage max. 230 V AC/DC 230 V AC/DC
Switching current max. 2.5 A 2 A
Contact load max. 100 VA 100 VA
Function NC* NC*
Switching point °C 50/60/70/80 50/60/70/80
Switching point tolerance ± 3 K ± 5 K
Hysteresis max. 10 K ± 3 K 18 K ± 5 K
Function NO* NO*
Switching point °C 50/60/70/80 50/60/70/80
Switching point tolerance ± 3 K ± 5 K
Hysteresis max. 10 K ± 3 K 26/35/40/45 K ± 5 K
*NO= NO contact / NC = NC contact Other temperatures and versions with 2 x TK
contact available upon request
Temperature signal
Temperature sensor
Pt 100
Class B, DIN EN 60 751 Tolerance ±0.8 °C
Temperature transmitter KT
Temperature sensor Pt100 Class B, DIN EN 60 751
Measuring range 0 °C to +100 °C
Operating 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
Other measuring ranges available upon request
2 Bühler Technologies GmbH We reserve the right to amend specification. DE100208 ◦ 09/2023
Nivotemp NT 61, NT 61D, NT 61-HT
Ordering instructions NT 61
Model key
Model designation
Version
MS
VA
Brass
float and immersion tube
Plug connector
M3
S6
M12
2M12
C6F
Length in mm (max. 1500)
280
370
500
nn
Standard lengths
variable, please specify value
Level measurement
1-4
Number of contacts
K
W
Model K10 (NC/NO)
Model W11 (change-over contact)
1st temperature signal
TK...
NC contact NO contact
TK50NC
TK60NC
TK70NC
TK80NC
TK50NO
TK60NO
TK70NO
TK80NO
= 50 °C
= 60 °C
= 70 °C
= 80 °C
TM...
TM50NC
TM60NC
TM70NC
TM80NC
TM50NC
TM60NC
TM70NC
TM80NC
TM50NO
TM60NO
TM70NO
TM80NO
= 50 °C
= 60 °C
= 70 °C
= 80 °C
Pt100
KT
Temperature sensor
Temperature transmitter
TM...
TM50NO
TM60NO
TM70NO
TM80NO
= 50 °C
= 60 °C
= 70 °C
= 80 °C
2nd temperature contacts (TM... only)
NO contactNC contact
Stilling tube
SSR
Cannot be combined with temperature contact
1)
NT 61
Level contact
Options
1)
1) 2)
2)
With KT only 10 - 30 V DC
------------
------------
------------
------------
------------
------------
-nn
-nn
3)
For version with 2 temperature contacts
3)
Ordering example
You require: Level switch MS version, plug connector S6, length L= 550 mm, 2 level contacts (NO/NC) and temperature contact
80 °C as NC contact, 1st contact 100 mm NC, 2nd contact 470 mm NO
Order NT 61-MS-S6-550-2-K-T80NC, L1=100 NC L2=470 NO
Standard pin assignment NT 61
Plug connection
M3 S6 C6F M12 2xM12
Dimensions
Number of pins 3-pin + PE 6-pin + PE 6-pin + PE 4-pin 4-pin / 4-pin
DIN EN 175301-803 175201-804 175301-804 61076-2-101 61076-2-101
Max. voltage 230 VAC / DC* 230 VAC / DC* 230 VAC / DC* 30 VDC 30 VDC
IP rating IP65 IP65 IP65 IP67** IP67**
Cable fitting PG 11 M20 x 1.5 PG 11
Max. Number of
contacts
Level/temp. contacts 1 x K10 / 1 x TK
- / -
- / -
3 x K10 / 1 x TK
2 x K10 / 2 x TM
1 x W11 / 1 x TK
1 x W11 / 2 x TM
3 x K10 / 1 x TK
2 x K10 / 2 x TM
1 x W11 / 1 x TK
1 x W11 / 2 x TM
1 x K10 / 1 x TK
- / -
- / -
3 x K10 / 1 x TK
2 x K10 / 2 x TM
1 x W11 / 1 x TK
1 x W11 / 2 x TM
Level contacts only
2 x K10
1 x W11
4 x K10
2 x W11
4 x K10
2 x W11
2 x K10
1 x W11
4 x K10
2 x W11
*Max. 48 VAC/ VDC for change-over contact. **with IP67 cable box attached. Other plug connections available upon request
3Bühler Technologies GmbHWe reserve the right to amend specification.DE100208 ◦ 09/2023
Nivotemp NT 61, NT 61D, NT 61-HT
M3 S6 C6F M12
(base)
2 x M12
(base)
Connection
schematic
3
12
PE
1
PE
2
3
4
5
6
1
PE
2
3
45
6
Plug A Plug B
K10
Level contact(s)
W11
Level contact(s)
K10
Level- and temperat-
ure contact
W11
Level- and temperat-
ure contact(s)
K10 / Pt100
Level- and temperat-
ure contact(s)
K10
Level and 2 x temper-
ature contact(s)
W11
Level and 2 x temper-
ature contact(s)
The standard assignment specified here refers to the max. number of contacts possible and contact function NO (contact type
K10).
4 Bühler Technologies GmbH We reserve the right to amend specification. DE100208 ◦ 09/2023
Nivotemp NT 61, NT 61D, NT 61-HT
Technical Data NT 61D
Basic Unit
Version MS VA
L1 = min. 30
L
L2 = min. 70
3.5
4
8 with VA stilling tube
12
116
Rubberised
cork seal
last contact
1st contact
Ø 44
min. 80
M12x1
min.Ø60
min. 80
last contact
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 (all versions) 280, 370, 500 mm (Standard), variable to max. 1500 mm in
10 mm increments
Material/Version MS VA
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. 200 g
approx. 30 g
approx. 300 g
approx. 50 g
Level switching output K10
Max. number 2
Function NO/NC*
Voltage max. 30 V DC
Switching current max. 0.5 A
Contact load max. 10 VA
Min. contact spacing 40 mm
Contact position in 10 mm increments
*NO = falling NC contact / NC = falling NO contact
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
Pt 100
Class B, DIN EN 60 751 Tolerance ±0.8 °C
Includes
Mounting screws (quantity 6), rubberised cork seal
5Bühler Technologies GmbHWe reserve the right to amend specification.DE100208 ◦ 09/2023
Nivotemp NT 61, NT 61D, NT 61-HT
Alternative 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
Alarm memory with 1 x assignable to alarm
logbook
with 1 x assignable to alarm
logbook
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 DC, 0-10 V
DC, 0-5 V DC
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 61D
Model key
Type designation, with display
Temperature measurement
2T
4T
1T-KT
2x PNP switching output
4x PNP switching output
1x PNP switching output
1x analogue output
4-20 mA
Options
Stilling tubeSSR
Version
MS
VA
Brass
float and VA immersion tube
Plug connector
2M12
Length in mm
280
370
500
nnn
Standard lengths
variable, please specify value, max. 1500
Level measurement
1K
2K
1x K10
2x K10
1st level contact
nn Please specify installation dimensions (L1 in mm)
falling NC contact
falling NO contact
2nd level contact
(if applicable)
NT 61D
falling NC contact
falling NO contact
NO
NC
Please specify installation
dimensions (L2 in mm)
nn
NO
NC
Switching function 1st contact
Switching function 2nd contact
------------
-2M12-nn -nn
-nn
------------
------------
------------ ------------
------------
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 VA version, length L= 550 mm, 2 level contacts: 1st contact 100 mm NC, 2nd contact 470 mm NO,
1 temperature output, 1 analog output, stilling tube
Order NT 61D-VA-2M12-550-2K-100- NC-470-NO-1T-KT-SSR
6 Bühler Technologies GmbH We reserve the right to amend specification. DE100208 ◦ 09/2023
Nivotemp NT 61, NT 61D, NT 61-HT
Standard pin assignment NT 61D
Plug connection
2 x M12 (base)
Dimensions
Number of pins 4-pin / 4-pin
DIN EN 61076-2-101
Voltage max. 30 V DC
Connection schematic Plug A
(level)
Plug B
(temperature)
2T Pin
2 x temperature output 1
2
3
4
+24 V 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
GND
S1 (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.DE100208 ◦ 09/2023
Nivotemp NT 61, NT 61D, NT 61-HT
Technical Data NT 61-HT
Basic Unit
Operating pressure max. 1 bar
last contact
55L
L2 = min. 70
L1 = min. 30
with VA stilling
tube
min. 60*
Rubberised cork
seal
1st contact
*min 80 with temperature
4
8
Ø51
3.5
min. Ø60
57
Ø60*
6x Ø6
Ø73
Ø90
*min. Ø61 for VA version with
stilling tube
Operating temperature -20 °C to +80 °C
Float SK 221
Min. fluid density 0.85 kg/dm³
Lengths (all versions) 280, 370, 500 mm (Standard), variable to max. 1500 mm
in 10 mm increments
Material/Version
Float 1.4571
Immersion tube 1.4571
Flange (DIN 24557) 1.4571
Weight at L=280 mm
Each 100 mm add
approx. 950 g
approx. 50 g
Includes:
Mounting screws (quantity 6) and rubberised cork seal.
Options
Stilling tube (SSR) Same material as immersion tube
Level switching contact
K10 W11 K10HT** W11HT**
Function NO/NC* Change-over
contact
NO/NC* Change-over
contact
Voltage max. 230 V AC/DC 48 V AC/DC 230 V AC/DC 48 V AC/DC
Switching current max. 0.5 A 0.5 A 0.5 A 0.5 A
Contact load max. 10 VA 20 VA 10 VA 20 VA
Min. contact spacing 40 mm 40 mm 40 mm 40 mm
Operating temperature 105 °C 105 °C 150 °C 150 °C
Contact position in 10 mm increments
*NO= falling NC contact / NC = falling NO contact **HT= not adjustable
Optional temperature switching outputs
Temperature contact TK TM
Number of temp. contacts 1 2
Voltage max. 230 V AC/DC 230 V AC/DC
Switching current max. 2.5 A 2 A
Contact load max. 100 VA 100 VA
Function NC* NC*
Switching point °C 50/60/70/80 50/60/70/80
Switching point tolerance ± 3 K ± 5 K
Hysteresis max. 10 K ± 3 K 18 K ± 5 K
Function NO* NO*
Switching point °C 50/60/70/80 50/60/70/80
Switching point tolerance ± 3 K ± 5 K
Hysteresis max. 10 K ± 3 K 26/35/40/45 K ± 5 K
*NO = NO contact / NC = NC contact Data for rising temperature. Other temperatures and version
with 2 x TK contact available upon request.
Optional temperature signal
Temperature sensor
Pt 100
Class B, DIN EN 60 751 Tolerance ±0.8 °C
Temperature transmitter KT
Temperature sensor Pt100 Class B, DIN EN 60 751
Measuring range 0 °C to +100 °C
Operating 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
Other measuring ranges available upon request
8 Bühler Technologies GmbH We reserve the right to amend specification. DE100208 ◦ 09/2023
Nivotemp NT 61, NT 61D, NT 61-HT
Ordering instructions NT 61-HT
Model key
Model designation
Version
HT
Stainless steel
Plug connector
M3
S6
M12
2M12
C6F
Length in mm (max. 1500)
280
370
500
nnn
Standard lengths
variable, please specify value
Level measurement
1-4
Number of contacts
K
K-HT
W
W-HT
Model K10 (NC/NO)
Model K10HT (NC/NO)
Model W11 (change-over contact)
Model W11HT (change-over contact)
1st temperature signal
TK...
NC contact NO contact
TK50NC
TK60NC
TK70NC
TK80NC
TK50NO
TK60NO
TK70NO
TK80NO
= 50 °C
= 60 °C
= 70 °C
= 80 °C
TM...
TM50NC
TM60NC
TM70NC
TM80NC
TM50NO
TM60NO
TM70NO
TM80NO
= 50 °C
= 60 °C
= 70 °C
= 80 °C
Pt100
KT
Temperature sensor
Temperature transmitter
TM...
TM50NC
TM60NC
TM70NC
TM80NC
TM50NO
TM60NO
TM70NO
TM80NO
= 50 °C
= 60 °C
= 70 °C
= 80 °C
2nd temperature contacts (TM... only)
NO contactNC contact
Stilling tube
SSR
Cannot be combined with temperature contact
Not adjustable
3)
2)
4)
With KT only 10 - 30 V DC
NT 61
Level contact
Options
2)
2)
3)
3) 4)
1)
Please specify position and switching function per model key
Example: L1 = nnn mm NC
1)
------------------------
------------
------------
-nn
-nn
------------
------------
For version with two temperature contacts
5)
5)
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 MS version, plug connector S6, length L= 550 mm, 2 level contacts (NO/NC) and temperature
contact 80 °C as NC contact, 1st contact 100 mm NC, 2nd contact 470 mm NO
Order NT 61HT-M3-550-2-K-HAT-PT100-SSR, L1=100 NC L2=470 NO
9Bühler Technologies GmbHWe reserve the right to amend specification.DE100208 ◦ 09/2023
Nivotemp NT 61, NT 61D, NT 61-HT
Standard pin assignment NT 61-HT
Plug connection
M3 S6 C6F M12 2xM12
Dimensions
Number of pins 3-pin + PE 6-pin + PE 6-pin + PE 4-pin 4-pin / 4-pin
DIN EN 175301-803 175201-804 175301-804 61076-2-101 61076-2-101
Max. voltage 230 V AC / DC* 230 V AC / DC* 230 V AC / DC* 30 V DC 30 V DC
Degree of protection IP65 IP65 IP65 IP67** IP67**
Cable fitting PG 11 M20 x 1.5 PG 11
Max. Number of
contacts
Level/temp. contacts 1 x K10 / 1 x TK
- / -
- / -
3 x K10 / 1 x TK
2 x K10 / 2 x TM
1 x W11 / 1 x TK
1 x W11 / 2 x TM
3 x K10 / 1 x TK
2 x K10 / 2 x TM
1 x W11 / 1 x TK
1 x W11 / 2 x TM
1 x K10 / 1 x TK
- / -
- / -
3 x K10 / 1 x TK
2 x K10 / 2 x TM
1 x W11 / 1 x TK
1 x W11 / 2 x TM
Level contacts only
2 x K10
1 x W11
4 x K10
2 x W11
4 x K10
2 x W11
2 x K10
1 x W11
4 x K10
2 x W11
*max. 48 V AC/V DC for change-over contact. **with IP67 cable box attached. Other plug connections available upon request.
10 Bühler Technologies GmbH We reserve the right to amend specification. DE100208 ◦ 09/2023
Nivotemp NT 61, NT 61D, NT 61-HT
M3 S6 C6F M12
(base)
2 x M12
(base)
Connection schem-
atic
3
12
PE
1
PE
2
3
4
5
6
1
PE
2
3
45
6
Plug A Plug B
K10
Level contact(s)
W11
Level contact(s)
K10
Level- and temper-
ature contact
W11
Level- and temper-
ature contact(s)
K10 / Pt100
Level- and temper-
ature contact(s)
K10
Level and 2 x tem-
perature contact(s)
W11
Level and 2 x tem-
perature contact(s)
The standard assignment specified here refers to the max. number of contacts possible and contact function NO (contact type
K10).
11Bühler Technologies GmbHWe reserve the right to amend specification.DE100208 ◦ 09/2023