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ATEX (Zone 1 and 21 purging system
installation)
GasEye Cross Duct
Operating instructions, 05/2021
221
12. Close both GasEye and purging system enclosures. Make sure that all of the
system glands are well sealed.
13. Make sure the system 24VDC power cable (9) wires are isolated and not
directly exposed in the hazardous zone. Energize purging controller (6).
14. Wait for controller to initialize, until there will be visible “Waiting for safe
conditions” text on the display. Parameters such as vent pressure, vent flow
and purging gas exchange percentage (during purging procedure) can be
shown on display by clicking “up” and “down” arrows on controller panel.
WARNING
All purging controller settings are pre-defined by Airoptic and user is not allowed to
change them.
15. Start the purging gas flow into 6mm gas input pipe (14) and slowly rise the
input pressure to ~1.5bar (observed on inlet pressure manometer) – this
pressure should be regulated in range 1.5-2bar to obtain the vent pressure
reading on the controller display in range of 3-24mbar during purging to ensure
proper system work.
Do not exceed system maximum input pressure of 2bar.
16. Wait until ‘rapid exchange’ LED on 6500 controller is lit blue (purging process
has started).
17. After purging, the GasEye will be powered up and ‘enclosure power’ LED on
6500 controller will be lit green.
18. Power for GasEye system will be interrupted if enclosure overpressure drops
below 1.3mbar.
Differences between Single Gas and Multi Gas systems
1. Single Gas system has only one laser placed in central unit tube.
Multi Gas system has two lasers placed in transmitter enclosure.
2. Single Gas system consists of only receiver and central unit enclosures, main
system electronics are placed in transmitter enclosure with laser in its tube.
Multi Gas (with two system consists of receiver, transmitter lasers and no other
electronics) and central unit enclosure which contains only main electronics
and no lasers.
3. Multi Gas system has larger overall internal volume of enclosures to
purge (0.016m
3
vs. 0.0131m
3
for Single Gas).
4. Multi Gas system is used to analyze two or more gases which absorption lines
wavelengths lies too far to each other to use only one laser.
Single Gas system is used to analyze one or more gases which absorption
lines wavelengths lies in a spectrum range that can be covered by a single
laser module.