WIKA TR10-A - Handbuch (Seite 22)

3345267.12 01/2014 GB/D
22 WIKA operating instructions RTD and TC, intrinsically safe designs (Ex i)
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 PTFE tape or
hemp. The threads must be lubricated with a suitable lubricant before fitting.
Tighten the threads by hand when carrying out the final assembly on the plant. This will
correspond to the delivery status of the premounted components. The final tightening and sealing
must be made with a spanner (1.5 to 3 rotations).
7. Information on mounting and operation in hazardous area (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
specifications of the respective national regulations concerning Ex usage apply.
A) The responsibility for classification 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
identifiable 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 fulfilled.
The manufacturer shall not be responsible for constructional modifications 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 certificate 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 ...