User Manual

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Siemens Immersion temperature sensors QAE26.9... CM1N1790en
Building Technologies 2017-12-01
Function
The sensor acquires the medium temperature via its sensing element whose resistance
value changes as a function of the temperature.
The signal is delivered for further handling by a suitable controller.
Characteristic:
−
40
−
30
−
20
−
10 0 10 20 30 40 50 60 70 80 90 100 110 120 130
1800
1600
1400
1200
1000
800
600
R
[Ω]
ϑ
1790D01
[°C]
140 150 160 170 180
2000
−
50
Accuracy:
−
40
−
30
−
20
−
10
0 10 20 30 40 50 60 70 80 90 100 110 120 130
1.5
1.0
0.5
0.0
−
0.5
−
1.0
−
1.5
∆ϑ [K]
ϑ
1790D02
[°C]
140 150 160 170 180
−
50
−
2.0
2.0
Mechanical design
The immersion temperature sensor consists of a stainless steel immersion stem, a
threaded bushing, and ready-wired connection cables. The sensing element is mounted
and soldered to the end of the immersion stem by means of a heat transfer compound.
The threaded bushing with screwed nipple R ¼ (sealing capacity within thread) is used
to mount the sensor on the pipe. The interface between the connection cable and the
immersion step is capped by a ca. 30 mm long shrink sleeve.
Sensing element