Gas Flow Diagram; Figure 3 Gas Flow Diagram - M&C PMA Series Instruction Manual

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GAS FLOW DIAGRAM

Figure 3 shows the gas flow diagram of the Oxygen Analyzer PMA50 EX.
3
1 : External fine filter
2 : External flow meter
3 : breathing and draining device
Figure 3 Gas flow diagram
The measuring cell 4 must absolutely be protected against dust particles. Therefore, the upstream external
gas conditioning system should be equipped with a fine filter 1 of at least 2 μm filter porosity (eg. type FP-
2T).
The maximum gas flow of 60 Nl/h can adjusted by an externally mounted flow meter 2 with a needle valve.
The sample gas enters the measuring cell 4 via the inlet breathing and draining device 3.
A flow sensor 5 in the outlet of the measuring cell is controlling the gas flow through the cell according to
the measuring principle of thermal conductivity. If the minimum gas flow is not reached, an alarm is auto-
matically triggered and is available as a status message at the collective status output. The status is also indi-
cated by a color change of LED
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4
5
2
14 (see Figure 1) on the front panel of the analyzer (red/green).
PMA 50 EX | 1.01.04
6
1
4 : Measuring cell
5 : Flow alarm sensor
6 : breathing and draining device
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