Description; Figure 1 Pma50 Ex Oxygen Analyzer - M&C PMA Series Instruction Manual

11

DESCRIPTION

The main part of the PMA50 EX is the paramagnetic oxygen measuring cell.
This measuring principle is one of the most precise quantitative methods for determination of the oxygen
contents in the range of 0-100 vol% O
The Oxygen Analyzer PMA50 EX is destined for stationary operation. The mounting into an Ex db eb IIC T4
housing 1 with breathing and draining devices in the sample gas inlet and outlet
installed in an explosive atmosphere of equipment group II, category 2, and allows the analysis of explosive
gases of equipment group II, category 2.
The analyzer is thermostatted and regulated to a transmitter temperature of +55 °C [131 °F]. The temperature
controller is designed in such a way that the low voltage section and the 230 V power section are separated
via an opto-coupler with zero voltage switch.
The large heating elements mounted on the transmitter surface guarantee a fast and even temperature dis-
tribution.
The non-reversible overtemperature fuse prevents the transmitter from overheating above 72 °C [161.6 °F].
For better heat storage and insulation, the transmitter is equipped with an insulating cover.
Figure 1 shows the Oxygen Analyzer PMA50 EX in front view and side view.
1 Enclosure
2 Sample gas inlet, outlet
3 Breathing and draining devices
type MC95A
4 Equipotential bonding terminal
5 Measuring range: internal, exter-
nal-LED
Figure 1 PMA50 EX oxygen analyzer
www.mc-techgroup.com
.
2
6 Measuring range-LED
7 Zero adjustment
8 Measuring range selector
9 Full scale adjustment
10 Cable gland M20
PMA 50 EX | 1.01.04
2 , allows the analyzer to be
11 Cable gland M20
12 Cable gland M25
13 Heating control-LED
14 Status-LED collective status
15 Measured value display
13