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Siemens

Clamp-on temperature sensor QAD2…

CE1N1801en

Building Technologies

2017-12-01

NTC 10k

Characteristic

Accuracy

100

1000

10000

100000

1000000

-30 -20 -10 0

10 20 30 40 50 60 70 80 90 100 110 120 130

[°C]

R [ ]

[°C]

-1.8

-1.6

-1.4

-1.2

-1.0

-0.8

-0.6

-0.4

-0.2

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

-30 -20 -10 0

10 20 30 40 50 60 70 80 90 100 110 120 130

[K]

R

Resistance in Ohm

Temperature in degrees Celsius

Temperature differential in Kelvin

Mechanical design

The strap-on temperature sensor consists of the following components:

Two-sectional plastic housing comprised of base with connection terminals, grommet

and removable cover (snap-on design)

The coupling sheet with sensing element is flexible and adapts to the pipe's surface

Mounting clamp (adjustable strap-on band) for pipe diameters from 15...140 mm

The connection terminals can be accessed after removing the housing cover. Cable

entry is made via a grommet (tension relief into housing). If required, the grommet can

be replaced by a Pg 11 cable entry gland.

Engineering notes

The permissible cable lengths are dependent on the controller with which the sensor is

used. They are specified in the Data Sheet of the relevant controller.

Mounting and installation notes

Depending on the application, the sensor is to be located as follows:

For flow temperature control:

In the heating flow:

Directly after the pump if the pump is located in the flow

1.5 to 2 m after the mixing valve if the pump is located in the return

For limiting the return temperature:

In the return at a location where the temperature can be correctly acquired

The water must be well mixed where the temperature is acquired.

The pipe may not be lagged in the vicinity of the sensor.

The sensor should be mounted such that the cable does not enter from the top.

Legend