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Temperature sensors PLH
Immersion lengths for Aquametro for sensor pockets and
temperature sensors
Recommendations for heating systems
Min. length of immersion tube (EBL)
pipe wall
ET
AD
ET
EBL
thickness of
middle third of the
pipe cross section
insulation
Nominal width of pipe DN
Thickness of insulation (mm)
Immersion depth ET (mm)
Face-to-face length EBL (mm)
1/2" / SP-E 85/105
1/2" / SP-E 120/140
1/2" / SP-E 155/175
1/2" / SP-E 210/230
Fig.:
Recommended mounting position in a 90° pipe bend
2
The temperature sensor PLH is a two-wire sensor which is connected via a 4-wire connection. Two
connecting wires must be connected to one terminal.
Sensor pockets and welded sleeves are available as accessories for mounting, see technical docu-
mentation for temperature sensor.
The temperature sensor PHL should be connected to the energy totaliser via the 4-wire temperature
input to terminals 5-1-2-6 (hot side) and 7-3-4-8 (cold side) respectively.
Insulation in the heating loops, heating plant regulations
(Example: Germany)
Pipe cross-section (mm)
up to DN 20
welded sleeve
DN 20 to DN 35
DN 40 to DN 100
DN 100 upwards
sensor pocket
Note: For measuring points compliant to CE-MID, with nominal width of
pipe 15, 20 and 25, directly immersed temperature sensors must be
used.
15
20
25
32
40
20
20
30
30
40
10
15
20
25
30
30
35
50
55
70
External length for sensor pockets in relation to immersion depth
60
55
90
117 110
Installation in a pipe bend is also recommended in which the sensor tip must always
be pointing against the direction of flow and the entire active length is in the centre of
flow. To avoid vortices and their associated influence on the flowmeter, the centre must
be mounted immediately downstream from this.
50
65
80
100
125
50
65
80
100
100
38
45
60
70
83
88 110
140
170
183
47
40
25
15
82
75
60
50
37
95
85
72
165
150
140
127
Thickness of insulation
(TI)
20 mm
30 mm
same TI as width
100 mm
150
200
250
300
100
100
100
100
95
120
145
170
195
220
245
270
25
60
35
10
115
90
65
40
PLH
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