Technical information

Temperature sensors, connection designs and thermowells formechanical and mechatronic expansion thermometers
WIKA data sheet IN 00.20

Applications■■ Determining the temperature sensor design■■ Determining the required minimum length■■ For all expansion thermometers

Versions■■ Plain design■■ Designs with screw connections■■ Designs with thermowells

Description
Temperature sensors
The various temperature sensors can be combined with all
expansion thermometers. They differ from each other with
their various connection designs and wetted parts.
In addition to the standard designs, there are also special
solutions for the widest variety of measuring point constructions.
The respective minimum required stem length, ET, for thevarious designs and display ranges are presented in a table.

SB15 safety temperature limiter with an SF91/SV20
temperature sensor

Thermowells
The fast-response designs, in order to optimise the response
characteristics, have both a reduced wall thickness and aminimised air gap between the thermowell inner wall and thefitted temperature sensor.
Expansion thermometer model TF59 with a plain SF94
temperature sensor

WIKA data sheet IN 00.20 ∙ 04/2011

Page 1 of 10

Connection design
Connection rotatable with sealing cone, SF91/SV20

Available for models IFC, SB-, SC-, SW15 and TF58/59 expansion thermometers
Model SF91 temperature sensor
Process connection
G = G ¼ B; G ⅜ B; G ½ B; M14 x 1.5

Model SF91 temperature sensor

Stem diameter
D = 5; 6; 8; 8.5; 10 mm
Stem material
Brass (2.0401); Copper (Cu)1.4571 stainless steel
Fitting
Brass (2.0401)

Model SH16 thermowell

Length is automatically determined from the required control
volume for the respective measuring range
For minimum sensor length, ET, see tables on page 3

Model SH16 thermowell
Process connection
G = G ⅜ B; G ½ B (for others see page 9)
Material
Brass (2.0401)
1.4571 stainless steel

Model SF91 temperature sensor with model SH16
thermowellStandard lengths
40, 50, 75, 80, 100, 150 mm
Immersion depth, ET = variable up to ET 80 mm one-piece,from 100 mm two-piece, soldered or welded
Immersion depth, ET = variable

Page 2 of 10

WIKA data sheet IN 00.20 ∙ 04/2011

Connection rotatable with sealing cone, SF91/SV19

Available for models IFC, SB-, SC-, SW15 and TF58/59 expansion thermometers
Model SF91 temperature sensor

Model SF91 temperature sensor

Process connection
G = G ¼ B; G ⅜ B; G ½ B; G ¾ B; G 1 B;
M14 x 1.5; M16 x 1.5; M18 x 1.5;
SV19 fitting
Brass (2.0401)
Stainless steel
Stem diameter
D = 5; 6; 8; 8.5; 10 mm
Stem material
Brass (2.0401)
Copper (Cu)1.4571 stainless steel
Immersion depth, ET = variable
Length is automatically determined from the required control
volume for the respective measuring range

Model Material Sensor Applidiameter cablein mmformodelScale
range in°C

56SF91
SV20

Copper (Cu)
8BR (2.0401)
8.5
10Stainlesssteel

6810WIKA data sheet IN 00.20 ∙ 04/2011

Minimum sensor length = ET min. X mm-40 ... +40 0 ... 40 0 ... 120 50 ... 150 0 ... 200 0 ... 250 0 ... 300 0 ... 350 50 ... 2500 ... 8050 ... 200250-200

150

100

100

100

50

100

100

150

50

50

50

50

50

50

50

150

IFC
SB15SC15SW15100
70300

100

100

10050

50

100
405070

3550

100
3540

100
3050

5025501003540250-2001501001001005010050150505050505050501503001001007050505050

Page 3 of 10Plain stem (without thread), SF94

Available for models IFC, MFT, SB-, SC-, SW15 and TF58/59 expansion thermometers
Model SF94 temperature sensor

Model SF94 plain temperature sensor

Stem diameter
D = 6; 8; 8.5; 10 mm
Immersion depth, ET = variable
Length is automatically determined from the required control
volume for the respective measuring range
For minimum sensor length, ET, see table

Model SH22 thermowell

Model SH22 thermowell
Process connection
G = G ¼ B, G ⅜ B; G ½ BStandard lengths
50, 70, 100, 150 mm (for others see page 9)
Immersion depth ET = variable up to ET 80 mm one-piece,from 100 mm two-piece, soldered or welded

Model SF94 temperature sensor with model SH22thermowell

Model Material Sensor Applidiameter cablein mm
formodel

68.5

SF94

Copper (Cu) 6BR (2.0401) 88.5
10

Stainlesssteel

Page 4 of 10

6810

Minimum sensor length = ET min. X mm

Scalerange in°C-40 ... +40 0 ... 40 0 ... 120 50 ... 150 0 ... 200 0 ... 250 0 ... 300 0 ... 350 50 ... 2500 ... 80
50 ... 200TF 58
TF 59
MFT150

250

100

100

50

100

505010080-65606060

60

55

70

150

300

100

100

70

100

100

50

100

100

100

50

40

35

3530

2535IFC
SB15SC15SW15100
70

250

150
50

150

100
-300

150

50

50

200

100
5050

50

150

100
5050

50

100
70

50

50

40

100
505050

50

100
5050

50

50

50

50

50

50

40

100
5050

WIKA data sheet IN 00.20 ∙ 04/2011

Connection rotatable with compression spring and fitting, SF95
Available for models IFC, SC15 and TF58/59 expansion thermometers
Model SF95 temperature sensor

Model SF95 temperature sensor

Process connection
M10 x 1Fitting
Brass (2.0401)
Stem diameter
D = 8.5 mm
Stem material
Brass (2.0401)
Copper (Cu)1.4571 stainless steel >300 °C

Model SB18 thermowell

Immersion depth, ET = variable
Length is automatically determined from the required control
volume for the respective measuring range

Model SB18 thermowell
Model SF95 temperature sensor with model SB18
thermowell

Process connection
G = G ¼ B, G ⅜ B, G ½ B
Material
Brass (2.0401)
1.4571 stainless steelStandard lengths
29, 32, 45, 75, 100, 150 mm (for others see page 9)
Immersion depth, ET = variable up to ET 80 mm one-piece,from 100 mm two-piece, soldered or welded

Model Material Sensor Applidiameter cablein mm
formodelScale
range in°C

SF95

Brass

8.5

WIKA data sheet IN 00.20 ∙ 04/2011

Minimum sensor length = ET min. X mm

-40 ... +40 0 ... 40 0 ... 120 50 ... 150 0 ... 200 0 ... 250 0 ... 300 0 ... 350 50 ... 2500 ... 8050 ... 200651205050

3535303035

Page 5 of 10

Connection rotatable with straight sealing ring, SF96/SV20(identical to BF2)
Available for models IFC, SC15, SB15 and SW15 expansion thermometers
Model SF96 temperature sensor

Model SF96 temperature sensor

Process connection
G = G ¼ B; G ⅜ B; G ½ B; G ¾ B; M14 x 1
SV20 fitting
Brass (2.0401)
Stainless steel
Stem diameter
D = 5; 6; 8; 10 mm
Stem material
Brass (2.0401)
Copper (Cu)1.4571 stainless steelStandard lengths l1 (ET)80, 140, 180, 230 mm, consistent with thermowells in accordance with DIN 16179 Form BD, BE, BS
Immersion depth, ET = variable
Length is automatically determined from the required control
volume for the respective measuring range

Model Material Sensor Applidiameter cable
in mm
for
modelScalerange in°C

SF96

6Brass8Copper (Cu)10
Stainlesssteel

Page 6 of 10

6810IFC
SB15
SC15SW15

Minimum sensor length = ET min. X mm

-40 ... +40 0 ... 40 0 ... 120 50 ... 150 0 ... 200 0 ... 250 0 ... 300 0 ... 350 50 ... 2500 ... 8050 ... 200150

300

100

100

70

100

100

5010070100

5050504050

50

40100
250

15050150-300150

50200

1005050150

1005050100705050100505050100505050505050501005050

WIKA data sheet IN 00.20 ∙ 04/2011

Connection with union nut, SF97/SV21(similar to Form 3, union nut)
Available for models IFC, SB-, SC-, SW15 expansion thermometers
Model SF97 temperature sensor

Model SF97 temperature sensor

Process connection
G = G ¼ B; G ⅜ B; G ½ B; G ¾ B; G 1 B;
M12 x 1; M14 x 1.5; M18 x 1.5
SV21 fitting
Brass (2.0401)
Stainless steel
Stem diameter
D = 6, 8, 10 mm
Stem material
Brass (2.0401)
Copper (Cu)1.4571 stainless steelStandard lengths l1 (ET)89, 126, 186, 226, 276 mm consistent with thermowells inaccordance with DIN 16179 Form CD, CE, CS
Immersion depth ET = variable from minimum length (activepart to the end of the stem extension)

Model Material Sensor Applidiameter cablein mm
for
model

Scale
range in°C

SF97

6Brass8
Copper (Cu)10
Stainlesssteel

6810

WIKA data sheet IN 00.20 ∙ 04/2011

Minimum sensor length = ET min. X mm-40 ... +40 0 ... 40 0 ... 120 50 ... 150 0 ... 200 0 ... 250 0 ... 300 0 ... 350 50 ... 250
0 ... 8050 ... 2001503001001007010010050100701005050504050504010025015050150-3001505020010050501501005050100705050100505050100505050505050501005050

Page 7 of 10Compression fitting sliding along the stem, SF98
(similar to BF4)
Available for models IFC, SB-, SC- and SW15 expansion thermometers
Model SF98 temperature sensor

Model SF98 temperature sensor

Process connection
G = G ¼ B; G ⅜ B; G ½ B; G ¾ B; G 1 B;
M12 x 1; M14 x 1.5; M18 x 1.5
SV19 fitting
Brass (2.0401)
Stainless steel
Stem diameter
D = 8.5 mm (extension D = 6 mm)
Stem material
Copper (Cu)1.4571 stainless steel
Stem extension tube
Brass (2.0401)
1.4571 stainless steel
Immersion depth ET = variable from minimum length (activepart to the end of the stem extension)

Model Material Sensor Applidiameter cablein mm
for
model

Scale
range in°C

SF98

Brass
8.5
Copper (Cu)Page 8 of 10

Minimum sensor length = ET min. X mm

-40 ... +40 0 ... 40 0 ... 120 50 ... 150 0 ... 200 0 ... 250 0 ... 300 0 ... 350 50 ... 2500 ... 8050 ... 20050-35262025202030

WIKA data sheet IN 00.20 ∙ 04/2011

Thermowells
Lock nuts and washers can be delivered for thermowells
mounted in through-holes. For applications for thermowells
at pressures over 10 bar with immersion depths over 50 mm,
please consult with us.

In order to eliminate corruption of the display, the temperature
sensors which are fitted into the thermowells, are matched.
The play between the thermowell drilling and the temperature
sensor diameter must not be more than 0.2 mm.
The SF94 and SF95 temperature sensors must touch thebottom of the thermowell. The SF91 temperature sensor must
fill the entire thermowell. The spiral at the end of the sensors
protects the capillary against buckling. To prevent bucklingof the capillary on insertion of sensors with longer immersion
depths, ET, the temperature sensor is supplied with an extension tube. In order to prevent corruption of the display, alltemperature sensors must be immersed with their complete
active part into the medium. The active part extends, for theminimum length, over the entire sensor length.

Ordering example
SH22 thermowell in BR for temperature sensor with 8.5 mm
diameter and an immersion depth of 100 mm and G ⅜ B
mounting threads for temperatures under 120 °C.
SH22-8.50-ET 100 G ⅜ B-MS-under 120 °C
Thermowells for temperatures under 120 °C are softsoldered.

SH16SH22X
X
X
X
X

WIKA data sheet IN 00.20 ∙ 04/2011

X
X
X
X

X
X

X

X

X

2932456075
901001504050758010015020025045506075
100150200250300

X
X
X
X
X
X
X
X
X
XX
X
X

X
X
X
X
X
X
X
X
X
X
X
X

10 mm

X
X
X

8.5 mm

X

8 mmX
X
X

Probe diameter
6 mmX
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X

SB18

M18 x 1.5X
X
X
X
X
X
X
X
X
X
X

X
X
X
X
X
X
X
X

M16 x 1.5

G½B

X
X
X
X
X
X

M14 x 1.5

G⅜B

X
X
X

G¾B

G¼B

Model

Mounting threads / process connection

Immersion
depth in mm

For special purposes V4A, chrome-plated BR and nickelplated BR thermowells can be supplied.

X
X
X
X
X
X
X
XXXX
X
X
X
X
X
X
X
X
X
X
X
X

X
X

Page 9 of 10

Model SF91 temperature sensor with model SH16
thermowell

Model SF95 temperature sensor with model SB18
thermowell

Model SF94 temperature sensor with model SH22
thermowell

Page 10 of 10

WIKA data sheet IN 00.20 ∙ 04/2011

WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg/Germany
Tel.
(+49) 9372/132-0
Fax(+49) 9372/132-406
E-mail info@wika.de
www.wika.de04/2011 GB© 2011 WIKA Alexander Wiegand SE & Co. KG, all rights reserved.
The specifications given in this document represent the state of engineering at the time of publishing.
We reserve the right to make modifications to the specifications and materials.