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2. Design and function
DIN 11866 row A or metric
Nominal
Nominal
width of
pressure
pipe
in bar
OD
PN
3) 4)
10
25
15
25
20
25
25
25
32
25
40
25
50
25
65
16
80
16
100
12.5
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
50 (60.3)
25
65 (76.1)
16
16
80 (88.9)
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
1.5
19
1.5
23
1.5
29
1.5
35
1.5
41
1.5
53
1.5
70
2.0
85
2.0
104
2.0
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
Pipe
Thermowell
length
insertion
length
TL
L
U
1
1
35
55
14
35
55
18
40
63
18
50
77
30
55
87
30
60
97
30
80
126 30
105 165 45
130 201 45
155 241 45
Pipe
Thermowell
length
insertion
length
TL
L
U
1
1
32
55
14
34
55
16
36
58
18
55
81
30
60
91
30
65
102 30
65
108 30
90
145 45
110 173 45
130 203 45
Neck tube
length
TR21-B TR22-B
EN
M
M
43
121
39
117
39
117
27
105
27
105
27
105
27
105
12
90
12
90
12
90
Neck tube
length
TR21-B TR22-B
M
M
43
121
41
119
39
117
27
105
27
105
27
105
27
105
12
90
12
90
12
90
9
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