WIKA operating instructions RTD and TC, intrinsically safe designs
3345267.08 06/2011 GB/D
21
GB
6.7 Tapered threads (NPT)
Connections with tapered threads (NPT) are self-sealing and normally must not be sealed. It
should be checked whether it may be necessary to seal them additionally with Teon tape or
hemp. The threads must be lubricated with a suitable lubricant before tting.
Tighten the threads by hand when carrying out the nal assembly on the plant. This will
correspond to the delivery status of the premounted components. The nal tightening and sealing
must be made with a spanner (1.5 to 3 rotations).
7. Information on mounting and operation in hazardous areas (Europe)
WARNING!
In hazardous areas the use of a model TR10-A measuring insert without a suitable
connection head (case) is not permissible!
Where required a suitable thermowell is to be used.
7.1 General information on explosion protection
The requirements of the 94/9/EC (ATEX) directive must be followed. Additionally the
specications of the respective national regulations concerning Ex usage apply.
A) The responsibility for classication of zones lies with the plant operator and not the
manufacturer/supplier of the equipment.
B) The plant operator guarantees, and is solely responsible, that all thermometers in use are
identiable with respect to all safety-relevant characteristics. Damaged thermometers may not
be used. Repairs may only be completed using original spare parts from the original supplier;
otherwise the requirements of the approval are not fullled.
The manufacturer shall not be responsible for constructional modications after delivery of the
instruments.
C) If a component of electrical equipment, on which the explosion protection depends, is
repaired, then the electrical equipment may only be put back into use, after an authorised
expert has stated that it corresponds to the fundamental characteristics of the requirements for
explosion protection. In addition this expert must provide a certicate for this and provide the
equipment with a test mark.
D) Item C) shall not apply if the component was repaired by the manufacturer in accordance with
the requirements and regulations.
6. Commissioning, operation / 7. Information on mounting and ...
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