A1 8 DTR.APC.APR.ALW.03
(ENG)
4. User information.
Together with the ordered transmitters, the user will receive:
− Product Certificate,
− Declaration of conformity,
− Copy of certificate – on request
− User’s Manual numbered: DTR.APC.APR.ALW.03
(ENG)
with Appendix Exi.
User can find them at www.aplisens.pl
Appendix Exi
5. Permitted input parameters (based on data from the FTZÚ 08 ATEX 0020X
certificate, and certification documentation).
The transmitters should be powered via the associated power feeding and measurement devices
provided with the relevant intrinsic-safe certificates. The parameters of their outputs to the danger zone
should not exceed the limit power supply parameters for the below specified transmitters.
5.1 - for power supply with a “linear“ characteristic
Ui = 28V Ii = 0,1A Pi = 0,7W for Ta ≤ 70°C i T5
Power supply with a “linear” characteristic may be e.g. a typical barrier with parameters
Uo = 28V Io = 0.093A Rw = 300.
Rw
Uo
IDIi
Io
Fig.1. Power supply from a source with “linear” characteristic
5.2. - for power supply with a “trapezial” characteristic
Ui = 24V Ii = 50mA Pi = 0,7W for Ta 80°C and T5
Example of power supply from a source with “trapezial” characteristic (see Fig. 2).
Io
Ui Uo
D
IRw
Uq
Ii
Fig. 2. Power supply from a source with “trapezial” characteristic
If Uo < then parameters Uq, Io, Po are interrelated as follows:
Uq = , Rw = , Po = for Uo 1/2Uq
5.3. - for power supply with “rectangular” characteristic
Ui = 24V Ii = 25mA Pi = 0,6W for Ta 80°C and T5
Ui = 24V Ii = 50mA Pi = 1,2W for Ta 80°C and T4
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 a 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.
transmitter
4Po
Io
Uq
Io
Uo(Uq – Uo)
Rw
transmitter
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