Aplisens APM-2 장치 설명서 - 페이지 11

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Aplisens APM-2 장치 설명서
If U
≤ 1/2U
, U
, I
Q
o
Q
Resistance Rw:
9.3.

Orthogonal power supply example

Uo = 24V Io = 25mA
Uo = 24V Io = 50mA
Orthogonal power supply means that the voltage of an intrinsically safe power adapter
does not change until the current limiter is activated.
The level of protection of orthogonal power supply adapters is usually "ib". A transmitter
supplied from such power adapter is usually an "ib" intrinsically safe device.
An example of power supply in practice:
A stabilized power adapter with Uo = 24 V, "ib" protection level and current limited to
Io = 25 mA.
10.

CONNECTING Exi TRANSMITTERS.

Transmitter and equipment in the transmitter measurement loop must be connected
in compliance with intrinsic safety and explosion proofing standards and conditions
for application in risk zones. If intrinsic safety rules are not followed, explosion can
occur and people can be exposed to danger.
The central unit is equipped with an additional communication resistor R
<SIGNAL -> and <TEST -> terminals are short-circuited in factory. R
when the transmitter need to be communicated with locally (from its terminals) and a
Ro < 240 Ω. <SIGNAL -> and <TEST -> terminals must be open-circuited then.
Revision 01.A.001/2022.09
, P
have the following relations:
0
0
Po = 0,6W
Po = 1,2W
Figure 5. Connecting Exi transmitter
U
(U
− U
)
o
Q
o
P
=
O
R
w
U
Q
R
=
w
I
o
EN.IX.APM.2
=240Ω.
D
resistor is used
D
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