E36.0.01.6C-01
Installation and
Operating Manual GIA 0420 … - ex
page 9 of 20
4.2.3 Example assignment for optionally switching output:
Please note: The max. permitted voltage and switching current of the switching output must not be exceeded (even
not for a short time).
Attention: The measuring and switching branches have to be supplied by the same intrinsically safe current
circuit. The total capacity and inductivity of GIA..., intrinsically sage transducer, intrinsically safe
switching device and cabling have to meet the limit values of the supply device.
Example for permitted connection values of switching devices/cabling if the universal isolating amplifier
ST 500 Ex - 10 - ..
and the 4-20mA transducer
IS-20 S
is used:
Connection values of the ST 500 for ia/IIC: Co = 47 nF, Lo = 2 mH
for ia/IIB: Co = 370 nF, Lo = 15 mH
Pressure transmitter IS-20 S
in conjunction with
GIA 0420 …
Connection value transmitter:
Ci < 22 nF, Li = 0 mH
Remaining values for
switching device/cabling:
for ia/IIC: Ci < 7.5 nF
(47 nF
– (13 + 4.5 + 22) nF)
Li < 2 mH
(2 mH
– (0 + 0) mH)
for ia/IIB: Ci < 330 nF
(370 nF
– (13 + 4.5 + 22) nF)
Li < 15 mH
(15 mH
– (0 + 0) mH)
4.2.4 GIA 0420 VO(T) - ex / S1: Switching of a alarm device
Attention:
The measuring and switching branches have to be supplied by the same intrinsically safe current circuit!
