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8 Handling
8.2.1
Installation location and alignment
To ensure ease of access in the installation location, sockets are often used to mount the thermometers.
Please note the following for the mounting work:
The larger the immersion depth into the measurement medium, the more accurate the measurement re-
sult will be as heat conduction errors will be reduced.
The probe tip usually needs to be positioned in the center of the pipe.
In many cases, minimum immersion depths will have been defined for your specific thermometer and
recorded in the documents provided.
NOTE!
The minimum immersion depths must be complied with!
If the minimum immersion depth is not known and an immersion depth cannot be inferred by other
means, the following rule of thumb can be used as a rough guideline:
For measurements in liquid media: an immersion depth ≥ 5 to 10 × the protection tube diameter
For measurements in gaseous media: an immersion depth ≥ 15 to 20 × the protection tube diameter
If a sufficient immersion depth cannot be provided due to a lack of space, you can choose an installation
position that is tilted against the flow direction by way of a remedy. It may also be worthwhile installing
the device in a pipe bend.
An inflow from the direction of the extended probe tip is preferable to an inflow perpendicular to the
probe.
It is also recommended to insulate the pipes, as inadequate insulation will encourage heat conduction
errors.
A good thermal connection between thermometers is important, particularly when using thermowells.
This can be ensured by reducing the clearance between the thermometer and thermowell or by intro-
ducing a heat-conducting medium or similar. (When using a heat-conducting medium, observe the max-
imum admissible temperature.) Before installing the thermometers, the thermowells must be fitted with
a plug to stop pollutants entering the interior.
