Pma 50 Ex/P/Pd-1-50 With Pressure Compensation And Enclosure Purging (Without Sil-Certification) - M&C PMA Series Instruction Manual

A window in the housing of the analyzer enables the control of the analog/digital measured value display 15,
the heating control LED
All operating elements are accessible from the outside and guarantee simple and user-friendly handling dur-
ing calibration as well as measuring range switching.
The operating elements are:

Full scale adjustment 9,

Measuring range selector

Zero adjustment 7.
The oxygen display 15
value is displayed in a range of 0-100 vol% with a resolution of 0.1 vol%. A digital display is integrated in the
analog display. Here the oxygen value is displayed in a range of 0-100 vol% with a resolution of 0.1 vol%.
The measuring range can be switched via selector switch 8. The selected measuring range is indicated exter-
nally by a corresponding LED
6).
The measuring range can also be selected externally (see Figure 6). An external selection overrides the selec-
tor switch 8. LED 5 on the front panel of the analyzer in conjunction with the corresponding measuring range
LED 6 signals the external measuring range control.
The function of the analyzer heating is indicated by LED 13. When the LED flashes, the operating tem-
perature is reached.
The PMA50 EX has a collective status output as standard. This is a potential-free changeover contact
in'Safety-First' circuit. The switching capacity is 200 mA at 48 A DC or 2 A at 250 V AC. The status is indicated
by the status LED 14.
The following status messages are displayed:

Light source defective,

measuring cell not coupled,

flow failure < 5 Nl/h,

power supply error control,

mains voltage breakdown,

transmitter temperature < +45 °C [113 °F]/> +60 °C [140 °F],

failure measuring range selection.
11.1
PMA 50 EX/P/PD-1-50 WITH PRESSURE COMPENSATION AND ENCLOSURE PURGING
(WITHOUT SIL-CERTIFICATION)
In case of barometric or process -related pressure variations, the PMA 50 EX can be equipped with a special
pressure compensation. The pressure can be compensated in a range of 0.6 to 1.5 bar abs. This can eliminate
measurement errors due to pressure fluctuations.
In addition, the analyzer is equipped with an enclosure purging via breathing and draining devices in the
inlet and outlet. The enclosure purging is necessary in case of corrosive sample gas and / or pressure above
1.1 bar abs. In the event of a leak in the analyzer, no pressure can build up in the housing and the analyzer
cannot be damaged by corrosion if the sample gas is additionally corrosive. The required purge gas quantity
is 10 - 60 Nl/h according to the set sample gas quantity, and the purge gas inlet pressure is max. 1.1 bar abs.
14
13 and status LED 14, as well as the measuring range LEDs
8 and
of the PMA50 EX consists of a two-scale analog display instrument. Here the oxygen
6 on the front panel of the PMA50 EX and by potential-free contacts (see Figure
PMA 50 EX | 1.01.04
5 and 6.
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