Airoptic GasEye, Руководство пользователя

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IECEx (Zone 2 and 22 purging system
installation)
248 GasEye Cross Duct SG and MG
Operating instructions, 05/2021
System electrical connections - intrinsic safety warnings
Even though power to the GasEye analyser is cut-off by the purging controller (in case
of pressurization loss), not all electrical connections that customer is supplying to the
system are safe (intrinsically safe). Those are:
- Externally powered analog or digital connections to analyser (through
Airoptic’s ‘customer cable’)
- Externally powered ethernet communication cable
- Externally powered Modbus communication cable
- Externally powered ProfiNet communication cable
- Externally powered Profibus communication cable
Those and all other electrical non-intrinsically safe connections with GasEye
analyser that are powered other way than through the 5500 purge controller,
must be cut-off when pressurization failure occurs to ensure safety.
WARNING
All non-intrinsically safe connections with GasEye analyzer that are powered
other way than through the 5500 purge controller, must be cut-off when
pressurization failure occurs to ensure safety.
To do this, “K2” alarm contacts in purging controller could be used, e.g. to control a
switch to cut-off all non-intrinsically safe, externally powered electrical connections to
the GasEye analyser.
We recommend that in case neither a switch nor intrinsically safe connection can be
used, customer should choose to use active analog input and output settings on the
GasEye analyser as they will be switched off by the purge controller. Similarly, digital
output should be powered from the same 24VDC provided to power the GasEye (i.e.
from 5500 purge controller).