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2. Design and function
DIN 11866 row B or ISO pipes
Nominal
Nominal
width of
pressure
pipe
in bar
DN (OD)
PN
3) 4)
8 (13.5)
25
10 (17.2)
25
15 (21.3)
25
20 (26.9)
25
25 (33.7)
25
32 (42.4)
25
40 (48.3)
25
25
50 (60.3)
16
65 (76.1)
80 (88.9)
16
DIN 11866 row C or ASME BPE
Nominal
Nominal
width of
pressure
pipe
in bar
OD
PN
3) 4)
½"
13.8
¾"
13.8
1"
13.8
1 ½"
13.8
2"
13.8
2 ½"
13.8
3"
13.8
4"
13.8
3) Maximum operating temperature 150 °C
4) All thermowells of this series that are internally pressurised, with a nominal diameter (DN) > 25 mm, are
manufactured and tested to module H of the pressure equipment directive.
WIKA operating instructions thermowell, model TW61
Outer
Pipe
diameter
schedule
of pipe
Ø D
s
13.5
1.6
17.2
1.6
21.3
1.6
26.9
1.6
33.7
2.0
42.4
2.0
48.3
2.0
60.3
2.0
76.1
2.0
88.9
2.3
Outer
Pipe
diameter
schedule
of pipe
Ø D
s
12.7
1.65
19.05
1.65
25.4
1.65
38.1
1.65
50.8
1.65
63.5
1.65
76.2
1.65
101.6
2.11
Pipe
Thermowell
length
insertion
length
TL
U
1
64
6
68
9
72
11
110
11
120
18
130
18
130
18
180
30
220
30
260
45
Pipe
Thermowell
length
insertion
length
TL
U
1
95.2
6
101.6
9
108.0
11
120.6
18
146.0
18
158.8
30
171.4
30
209.6
45
Neck tube
length
TR21-B TR22-B
EN
M
M
51
129
48
126
46
124
46
124
39
117
39
117
39
117
27
105
27
105
12
90
Neck tube
length
TR21-B TR22-B
M
M
51
129
48
126
46
124
39
117
39
117
27
105
27
105
12
90
7
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