M&C TechGroup PMA 50 EEX Operator's manual - Manual (Page 19)

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Gas sampling and gas conditioning technology 9-3.15-ME
16 SUPPLY CONNECTIONS
16.1 SAMPLE GAS INLET AND SAMPLE GAS OUTLET
The sample gas inlet and outlet are placed on the lower side of the analyzer. Both are equipped
with ventilate arrestors type MC 95 A
. The certified ventilate arrestors are executed with 1/4“ NPT
inside thread.
W A R N I N G !
The Ex-approval of the oxygen analyser is only valid in connection
with the approved ventilate arrestors. For this reason, it is not al-
lowed to remove them or to use other types of ventilate arrestors !
The sample gas must be dry and free from dust. The sample gas inlet temperature should not
exceed 40°C. Otherwise, a preceding gas cooler with automatic condensate collection is reco m-
mended.
The sample gas should escape atmospherically from the outlet if possible, because a pressure
increase inside the measuring cell would falsify the oxygen indication. The maximum inlet pre s-
sure is 100mbar.
The sample gas quantity should be adjusted according to local circumstances between 6Nl/h and
60 Nl/h air (external flow meter).
16.2 OPTION PURGING ENCLOSURE OR VENTILATION
According to the Ex-Certificate (see annexe) purging of the enclosure is also requested in case of
increased inlet pressures of 1,1 to max. 1,5 bar. Please choose option part no. 05A9005 respec-
tively with increased pressure and corrosive gases option purging enclosure part no. 05A9000.
When measuring corrosive gases, it is advisable to equip the analyser with the possibility of purg-
ing enclosure. This reduces the risk of distruction of the analyser due to corrosion in case of
leaky gas ways. For this please choose option part no. 05A9000 (2 x ventilate arrestor).
The flush gas inlet and outlet are placed on the upper side of the analyser housing. They too, are
both equipped with ventilate arrestors of type MC 95 A
with 1/4“ NPTi-connections 16 (see figure
1, broken line).
Dry air or nitrogen has to be used for purging the enclosure. The purge gas flow rate has to be
adjusted between 10Nl/h and 60Nl/h.
Please indicate the option
‘purging enclosure’ with your order !
For a retrofitting of the analyser with the option purging enclosure, the following components are
necessary:

two ventilate arrestors type MC95A, part number 90A5150

1 x male connector DN4/6-
1/4““NPTi, part number 05V2060 for the purge gas connection.
N O T E !
Please mount the ventilate arrestors with LOCTITE™ type 270 to
anticipate unwanted loosening of the devices !