Aplisens APM-2 Apparaathandleiding - Pagina 10

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Aplisens APM-2 Apparaathandleiding
EN.IX.APM.2
9.

PERMISSIBLE PARAMETERS OF Exi TRANSMITTERS.

Table 2. Permissible input parameters of an Exi transmitter.

Temperature
class
T5
T4
T3
Ta – ambient temperature;
Tm – process temperature.
Supply power to transmitters from supply and measurement devices with
applicable intrinsic safety certificates whose parameters of outputs to a hazard
zone should not exceed the permissible transmitter power supply parameters
specified above.
9.1.

Linear power supply example

For example, linear power supply is provided by a typical barrier with the following
parameters
Uo = 28V; Io = 0,1A; Po = 0,7W; Rw = 280.
9.2.

Trapezoidal power supply example

Uo = 24V; Io = 50mA; Po = 0,7W
An example of trapezoidal power supply is shown in
Figure 4. Principle of power supply from a trapezoidal source.
U
Q
If U
>
, U
, I
, P
Q
0
o
2
10
Maximum
Linear power
surface
temperature
Ui=30V
Ii=0,1A
of the
Pi=0,75W
transmitter
Ci=7,5nF
Li=18µH
100°C
135°C
155°C
Figure 3. Principle of power supply from a linear source.
have the following relations:
0
Trapezoidal
supply
power supply
Ui=24V, U
Ii=0,05A
Pi=0,6W
Ci=7,5nF
Li=18µH
Ta≤60°C; Tm≤90°C
Ta≤80°C; Tm≤125°C
Ta≤80°C; Tm≤150°C
Figure 4
U
∗ I
Q
o
P
=
o
4
Orthogonal power
supply
=48V
Ui=24V
Q
Ii=0,025A
Pi=0,6W
Ci=7,5nF
Li=18µH
.
Revision 01.A.001/2022.09
Ui=24V
Ii=0,05A
Pi=1.2W
Ci=7,5nF
Li=18µH