M&C TechGroup PMA 20 Data sheet - Manual

M&C TechGroup Germany GmbH • Rehhecke 79 • 40885 Ratingen • Germany
[email protected] • www.mc-techgroup.com • Fon +49 2102 935-0 • Fax +49 2102 935-111
13.3
Embracing Challenge
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Thermostated, in a wall mounting hous-
ing
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Small space requirement
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Accurate and reliable
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Analogue indicator, linear measuring
ranges
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Physical measuring principle
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Small stagnant volume, fast response
time
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Safety in operation
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Approved according to DIN EN 14181
resp. to 13th and 17th BImSchV and TÜV
certificate TA-Luft as option
Special Features
Oxygen Analyser Series PMA®
Thermostated version PMA 20
in a wall mounting housing
PMA 20
Application
Due to the extremely fast response time of
the patented M&C magneto-dynamic meas-
uring 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 appli-
cations.
The analyser is a suitable and reliable instru-
ment for monitoring oxygen concentrations
in various gas analytical control applica-
tions 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 tem-
perature 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 main-
tains 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 connec-
tors 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 ox-
ygen analyser
The PMA 20 utilises the paramagnetic prin-
ciple of operation to measure oxygen con-
centrations. The analyser measures the para-
magnetic susceptibility of the oxygen in the
sample gas by means of the M&C magneto-
dynamic measuring cell. The physical prop-
ertys 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 deter-
mine the oxygen concentration in a gas mix-
ture 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 condi-
tioning 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 paramag-
netic 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 specifications and illustrations are without
obligation, subject to modifications. 05.97/12.06