WIKA 45 - Manual (Page 5)

GB
4. Installation conditions, installation / 5. Troubleshooting
11484498.02 06/2010 GB/D/F/E
WIKA operating instructions bimetal thermometers for HVAC 5
4. Installation conditions and installation
Before installation ensure that all the necessary accessories needed for the
mounting method have been delivered. The accessories will be either on the
instrument or supplied in a separate bag, which in most cases will be attached to
the thermometer.
■ Before installing the probe or the pocket (protective sleeve), check whether
the material used (specified in the delivery note) is chemically resistant/
neutral to the medium being measured.
■ Heat conduction errors occur when the size, volume or area of the medium to
be measured is very small, so that the temperature probe becomes noticeable
as a thermal mass. Heat conduction errors may also occur when the insertion
length is not sufficient, or when the instrument mounting fittings are attached
to a good heat conductor (e.g. metal plates) and the temperature difference
between them and the medium to be measured is very high.
1) not for models E45.10, A46.11, A48.10 and edgewise panel design model TF-01-058KF-BI
5. Troubleshooting
Bimetal thermometers are maintenance-free instruments according to their basic
design. As measuring instruments, their measuring accuracy should be checked
at application-specific intervals. The wear condition of probes exposed to a
permanent thermal stress (even if this stress is very low), exposed to vibratory
stress, must be checked from time to time. If any visible damage is found, the
instrument must be replaced.