E6 16 DTR.APC.APR.ALW.03(ENG)
Appendix Exi.IECEx
5.3. For power supply with a rectangular output characteristic
Ui = 24V Ii = 25mA Pi = 0,6W -40ºC Ta 80ºC and T5
Ui = 24V Ii = 50mA Pi = 1,2W -40ºC Ta 80ºC and T5,
The supply of power from a source with a rectangular characteristic means that the voltage of the Ex power
supply remains constant until current limitation activates.
The protection level of power supplies with a rectangular characteristic is normally “ib”.
The transmitter powered from such a supply is also an Ex device with protection level “ib”.
Example of practical provision of power supply.
– use a stabilized power supply with Uo=24V with protection level „ib” and current limited to Io=25mA.
5.4. Input inductance and capacity
Ci=2.5nF, Li=18µH
5.5. Supply voltage min.: 10.5VDC
5.6. Load resistance:
- from 28V linear supply
Ro max [Ω] =
- from a source with trapezial or rectangular characteristic supply
Ro max [Ω] =
*) barrier resistance.
6. How to connect Ex transmitters APC…, APR…
According to the p.6 DTR.APC.APR.ALW.03(ENG) Appendix Exi.ATEX.
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 IEC 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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