EN
14073045.04 03/2019 EN/DE
WIKA operating instructions model TR25 (Ex i)
16
D) Item C) shall not apply if the component was repaired by the manufacturer in
accordance with the requirements and regulations.
E) When using transmitters and digital displays, the following must be observed:
The contents of these operating instructions and those of the transmitter.
The relevant regulations for installation and use of electrical systems.
The regulations and directives regarding explosion protection. Transmitters and digital
displays must have their own approval.
F) When ordering spare parts, the parts that are to be replaced must be specified exactly:
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Ignition protection type (here Ex i)
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Approval No.
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Order No.
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Manufacturing No.
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Order item
7.1.1 Special conditions of use (X conditions)
Versions with Ø < 3 mm or “non-insulated“ versions are operationally non-compliant with
section 6.3.12 of IEC/EN 60079-11. Therefore, from a safety-relevant point of view, these
intrinsically safe circuits must be considered galvanically connected to the earth potential,
which is why equipotential bonding must be secured for the entire installation of the
intrinsically safe circuits. In addition, for the connection, separate conditions in accordance
with IEC/EN 60079-14 must be observed.
Electrostatic discharges must be avoided in instruments, that due to their design, do not
conform to the electrostatic requirements in accordance with IEC/EN 60079-0.
The transmitters and digital displays used must have their own IEC/EN approval. The
installation conditions, electrical connected loads, temperature classes or maximum
surface temperatures for use in potentially explosive dust atmospheres and permissible
ambient temperatures can be seen from the relevant approvals and must be observed.
Thermal backflow from the process, that exceeds the permissible ambient temperature
of the transmitter, must not be allowed to occur. It must be prevented by installing suitable
heat insulation or a neck tube of suitable length.
If the wall thickness is below 1 mm, the instruments must not be subjected to ambient
stresses that may have an adverse effect on the partition wall. Alternatively, a thermowell of
suitable minimum wall thickness may be used.
When using a thermowell/neck tube, the overall instrument must be designed such that it
allows installation in a way that results in a sufficiently tight gap (IP67) or a flameproof gap
(IEC/EN 60079-1) towards the less hazardous area.
7. Information on mounting and operation in hazardous areas