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22 Micro Motion
®
Model 2400S Transmitters
I/O Wiring – Model 2400S Analog Transmitters
Hazardous area inductance
The inductance (Li) of the Model 2400S transmitter is 0.0 mH. This value plus the field wiring
inductance (Lcable) must be lower than the maximum allowable inductance (L
a
) specified by the IS
barrier. The following equation can then be used to calculate the maximum cable length between the
transmitter and the barrier:
3.5.2 Hazardous area mA wiring
Figure 3-15 illustrates the basic hazardous area wiring for the Model 2400S Analog transmitter’s mA
output.
Figure 3-15 Hazardous area mA output wiring
L
i
L
cable
L
a
≤+
Hazardous area Safe area
R
barrier
4–20 mA
R
load
V
in
V
out
Ground
Note: R
barrier
and R
load
should be added together to
determine the proper V
in
. Refer to Figure 3-16.
R
barrier
Note: Channel B (terminals 3 and 4) can also be
configured this way.