WIKA TR12 Serie Manual De Instrucciones página 8

3. Commissioning, operation
3.2 Locking screw
EN
3.3 Electrical mounting
For the installation of the thermometer, only components (e.g. cables, cable glands,
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etc.) permitted for "flameproof enclosure" may be used.
Using a transmitter/digital display (option):
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- Observe the contents of these operating instructions and those of the transmitter/
digital display (see scope of delivery).
- Observe the relevant regulations for installation and use of electrical systems, and also
the regulations and guidelines for explosion protection.
The temperature resistance of the connection lead must match the permissible
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operating temperature of the cases. For ambient temperatures above 60 °C,
heat-resistant connection leads must be used.
Do not fit any batteries into the flameproof case.
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No capacitor may be fitted within the flameproof case that has a residual energy of
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≥ 0.02 mJ at the end of the time required for opening the case. The case must not be
opened during operation. After the operating voltage has been switched off, a waiting
time of 2 minutes must be observed before opening the case.
Mounting within metal vessels:
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The case must be grounded against electromagnetic fields and electrostatic charge.
It must not be connected separately to the equipotential bonding system. It is sufficient
if the metal thermowell has a solid and secured contact with the metal vessel or its
structural components or pipelines, so long as these components are connected to the
equipotential bonding system.
Mounting within non-metal vessels:
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All electrically conductive thermometer components within the hazardous area must be
provided with equipotential bonding.
8
Always tighten the locking screw to prevent unintended opening
of the head with flameproof enclosure.
Before opening the head, always loosen the locking screw
sufficiently.
WIKA additional information TR12/TC12, flameproof enclosure (Ex d)