M&C TechGroup PMA 50 EEX Datasheet
PMA 50 EEX
Embracing Challenge
Oxygen Analyser Series PMA®
Thermostated version PMA 50 EEX
in a wall mounting explosion-proof housing
SIL
DIN EN 61508
Special Features
Explosion proof according to ATEX and
NEPSI for Zone 1
SIL approval according to DIN EN 61508
Thermostated, in an explosion-proof
housing
Accurate and reliable, small space
requirement
Analogue/Digital indicator
Five linear measuring ranges
Physical measuring principle
Small stagnant volume, fast response
time
Remote range indication and control
Flow alarm sensor
Status alarm, safety in operation
Application
Due to the extremely fast response time
of the M&C magneto-dynamic measuring
cell with no stagnant volume as well as the
negligible cross sensitivity from other sample
gas components, the M&C oxygen analyser
PMA 50 EEX is a suitiable and reliable instrument for monitoring oxygen concentrations
in various gas analytical process control applications.
Description
The M&C oxygen analyser PMA 50 EEX is a
temperature controlled instrument which has
been designed for continuous measurements
of oxygen concentrations in particle-free and
dry sample gas with a flow rate between 0-60
Nl/hr.
The PMA 50 EEX is a reliable and easy-tooperate instrument. It is built into an
explosion-proof EEX d e IIC T5 wallmounting housing with stainless steel tubing
and certified ventilate arrestors at sample gas
inlet and outlet. The transducer unit maintains a constant operating temperature of 55
°C and a flashing LED on the control panel
indicates the proper operating temperature
of the analyser. The five measuring ranges
are displayed on the analogue meter with
30/100% scale and the 100% range on the
digital meter. The selected measuring range
is displayed on the front panel by LED’s. Two
output signals are available. The terminals
for the incoming power supply, two output
signals, remote range indication and control
and status alarm are located inside the EEX
e box. The sample gas enters the analyser via
a ventilate arrestor after it passed through an
external sample conditioning system with at
least a protective fine filter and flowmeter
with needle valve for adjusting the required
flow rate of the sample gas (also available
with M&C). After passing the M&C measuring cell and the flow sensor, the sample gas
leaves the instrument via the certified outlet
ventilate arrestor.
Measuring principle of M&C oxygen analyser
The PMA 50 EEX utilises the paramagnetic
principle of operation to measure oxygen
concentrations. The analyser measures the
paramagnetic susceptibility of the oxygen
in the sample gas by means of the M&C
magneto-dynamic measuring cell. The physical propertys which distinguishes oxygen
from other gases is its paramagnetism. It is
significantly higher comparing to other common gases. This operation principle is one of
the most accurate and reliable procedures to
determine the oxygen concentration in a gas
mixture from 0 to 100 Vol.%.
The robust M&C cross-flow cell has no
stagnant volume. Advantages are the fast
response time, the flow rate up to 60 l/hr,
the small volume of 2 ml, the extremely low
drift, the absolute linearity and the negligible
cross sensitivity against other sample gas
components. With a proper sample conditioning and pressure, the M&C cell will never
need replacing. The dumbbell with a small
mirror at its centre is mounted in a strong
inhomogenous magnetic field. The paramagnetic oxygen strengthens the forces on the
diamagnetic dumbbell and causes a shifting
which is detected by a system consisting of
light beam, mirror and a photo cell.
A compensation current is induced via the
feedback coil on the dumbbell and leads to
a reset of the dumbbell into its zero-position.
The required current is linearly proportional to
the oxygen concentration.
Technical specications and illustrations are without
obligation, subject to modications. 02.95/01.07
M&C TechGroup Germany GmbH • Rehhecke 79 • 40885 Ratingen • Germany
info@mc-techgroup.com • www.mc-techgroup.com • Fon +49 2102 935-0 • Fax +49 2102 935-111
13.7
Gas flow diagram PMA 50 EEX
1. External fine filter
2. External flowmeter with needle valve
3. Ventilate arrestor
4. Oxygen measuring cell PMA
5. Flow alarm sensor
(and at version #:with
pressure sensor)
Dimensions
1. Sample gas in/out with certified
ventilate arrestors
2. Cable glands 2x PG 13,5; 1x PG 16
3. Zero control
4. Measuring range select
5. Span control
6. Optional purging with certified venti-
late arrestors
1 2
3
5
4
FLA
(P)
3
Front view Side view
200
60
70
275
355
275
6
60
40
80
20
0
15
20
10
25
5
30
0
20.9
100
Dimensions in mm
130
O -Analyser
535
70
2
PMA 50 Ex
53 4
1
2
13.7
M&C TechGroup Germany GmbH • Rehhecke 79 • 40885 Ratingen • Germany
info@mc-techgroup.com • www.mc-techgroup.com • Fon +49 2102 935-0 • Fax +49 2102 935-111
Technical specications and illustrations are without
obligation, subject to modications. 02.95/01.07
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