M&C TechGroup PMA 20 Datasheet
PMA 20
Embracing Challenge
Oxygen Analyser Series PMA®
Thermostated version PMA 20
in a wall mounting housing
Special Features
Thermostated, in a wall mounting hous-
ing
Small space requirement
Accurate and reliable
Analogue indicator, linear measuring
ranges
Physical measuring principle
Small stagnant volume, fast response
time
Safety in operation
Approved according to DIN EN 14181
resp. to 13th and 17th BImSchV and TÜV
certicate TA-Luft as option
Application
Due to the extremely fast response time of
the patented 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 20 has a wide variety of applications.
The analyser is a suitable and reliable instrument for monitoring oxygen concentrations
in various gas analytical control applications including flue gas-, inert gas-, ambient
air-, fermentation processes- and process or
laboratory control measurements.
Description
The M&C oxygen analyser PMA 20 is a temperature controlled instrument which has
been designed for continuous measurements
of oxygen concentrations in particle-free and
dry sample gas.
The PMA 20 is a reliable and easy-to-operate
instrument. It is built into a compact wall
mounting housing. The transducer unit maintains a constant operating temperature of 50
°C and a flashing LED on the control panel
indicates the proper operating temperature
of the analyser. The four measuring ranges
are displayed on the analogue meter with 30/
100% scale. Two output signals are available.
Sample gas connections as well as connectors for incoming power supply and output
signals are located inside the terminal box
of the housing. The sample gas enters the
analyser via an external protective fine-filter.
The required flow rate can be adjusted at the
flowmeter with needle valve, mounted on the
front panel upstream the M&C measuring cell.
The internal tubing is made of FPM and PP.
Option: ”TÜV certificate” or chlorine resistant
version.
Measuring principle of M&C oxygen analyser
The PMA 20 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 magnetodynamic 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. 05.97/12.06
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
13.3
Gas flow diagram PMA 20
1 2
3
1. External fine filter
2. Flowmeter with needle valve
3. Oxygen measuring cell PMA
Dimensions
Front view Side view
120
214
200
20
0
5
0
O -Analyser
2
PMA 20
100
40
15
10
Vol.% O
30
10
182
60
80
100
20
25
30
2
Zero
3
Span
220
Dimensions in mm
ø 6
13.3
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. 05.97/12.06
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