Appendix Exi.ATEX
6. How to connect Ex transmitters APC…, APR…
The transmitter and other devices in the measuring loop should be connected in accordance
with the intrinsic-safety and explosion-safety regulations and the conditions for use
in dangerous areas.
Failure to observe the intrinsic-safety regulations can cause explosion and the resulting hazard
to people.
The transmitter is equipped in additional communication resistor RD = 240Ω.
During normal operation terminals <SIGNAL –> and <TEST –> are shorted.
RD resistor is used when you wish to communicate with the transmitter locally (from its terminals)
and Ro < 240. Terminals <SIGNAL –> and <TEST –> must be opened.
If the temperature of the medium exceeds Ta, then suitable separators such as diaphragm seals or
P-type siphon tubes must be used. Transmitter working temperature (Tp) must conform to Tp≤Ta.
Special conditions for safe use:
Versions of transmitter with surge arrester, marked on the plate "Version SA" do not meet the
requirements of Section 10.3 of the EN 60079-11 (500Vrms). This must be taken into account when
installing the equipment.
Under certain extreme circumstances in dust explosive atmospheres, the device with painting of
aluminium enclosure and with plastic tables and with elements of diaphragm seals covered by PTFE
may store an ignition-capable level of electrostatic change. The device shall not be installed in a
location where the external conditions are conducive to the build-up of electrostatic charge (see p.7.4.).
If the diaphragm seals contains titan parts, it must be protected against mechanical drops.
Galvanically separated part of apparatus placed into measuring head is electrically connected with
mass of enclosure. It should be taken into account when installing the apparatus with remote
measuring head on cable.
It is not allowed to repair or otherwise interfere with the transmitter’s electrical circuits in any
way. Damage and possible repair may be assessed only by the manufacturer or another
authorized party.
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