M&C PMA Series Instruction Manual page 34

For dismounting the measuring cell, the following procedure is recommended:
Warning
Warning
 Loosen the inside hex screws of the housing window;
 Unscrew the window lid of the analyzer;
 Loosen the fastening screw (M4 in the middle left) of the inside front plate;
 Pull out the front plate and swing it out to the right side;
 Remove carefully the black isolating cap from the transmitter unit;
Warning
 Loosen the threaded tube couplings
Warning
 Pull off the green 2-, 3- and 4-pole plug-in connections (on terminal X1, X2 and X3) from the power supply board;
 Loosen the earth connection (green-yellow) of the transmitter unit
 Loosen the four hex screws
 Loosen union nuts
5 at sample in-
Now, the complete transmitter unit can be taken out of the housing. All further procedures should be executed on a
clean work bench outside the hazardous area. Put the transmitter unit in a position as shown in Figure 8 (18-pin plug
must show to the right side).
34
During all work on the analyzer it must be ensured that both the working environ-
ment and the analyzer itself are free of explosive or flammable gases!
Dangerous voltage. Before performing any maintenance work, disconnect the an-
alyzer and all external circuits connected to the analyzer from the power supply.
Hot transmitter surface up to 55 °C [131 °F].
Touching may lead to burnings.
Wear safety gloves!
5 of the sample gas inlet and the sample gas outlet (see Figure 7);
Strong magnetic field. Before dismounting the transmitter unit, remove all sensi-
ble parts (eg. wrist watch etc.)!
3 (see Figure 7) on top of the transmitter mounting plate;
8 and outlet 6 (see Figure 7);
PMA 50 EX | 1.01.04
(2 see Figure 7);
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