M&C TechGroup PMA 50 EEX Operator's manual - Manual (Page 14)

14
Gas sampling and gas conditioning technology 9-3.15-ME
11.2 PMA 50 EX/P/PD WITH PRESSURE COMPENSATION (WITHOUT SIL-
CERTIFICATION)
In case of barometric or process originated pressure variations, the PMA 50 Ex can be equipped
with a special pressure compensation. The compensation can be effected within a pressure
range of 0,6
– 1,1 bar abs.. Thereby errors in measurement caused by pressure variations can
be eliminated.
11.3 OPTION ZERO SUPPRESSION (WITHOUT SIL-CERTIFICATION)
A zero suppression is possible for devices with pressure compensation within a range of 1% to
97% O
2
. The suppressed measuring range depending on the suppression is lying on the position
of a standard measuring range. The factory provided adjusted suppression can be switched on
and off via an actuator at the terminals 22 resp. 23 inside of the connection box of the analyser
(see Fig. 5). After switching off the original measuring range again is active.
11.4 OPTION ENCLOSURE PURGING OR VENTILATION
For measurement of corrosive gases it is recommandable to equip the analyser with an enclosure
purging. This reduces the risk of a destruction of the analyser by corrosion in case of leaky gas
ways. For this please choose option part number 05A9000 ( 2 x ventilate arrestors). The neces-
sary purge gas quantity is 10
– 60 Nl/hr corresponding to the adjusted sample gas quantity and
the purge gas inlet pressure is max. 100 mbar.
In case of elevated inlet pressure of 1,1bar up to max. 1,5bar abs. also one ventilate arrestor
according to the ex-certificate (see appendix) is required. For this choose option with part number
05A9005. For elevated inlet pressure of 1,1bar up to max. 1,5bar abs. and corrosive sample gas
the analyser has to be equipped with option part number 05A90000 (enclosure purging). The
necessary purge gas quantity is 10
– 60 Nl/hr corresponding to the adjusted sample gas quantity
and the purge gas inlet pressure is max. 100 mbar.
N O T E !
For excess pressure operation (>100 mbar) an enclosure ventilation ac-
cording to the ex-certificate is necessary. For additionally corrosive
sample gas an enclosure purging is necessary. Both have to flow off
atmospherically free!