M&C TechGroup PMA 30A-D Datasheet
Embracing Challenge
Oxygen Analyser Series PMA®
PMA 30A/D
Special Features
SIL approval according to DIN EN 61508
Thermostated, in compact 19”-cassette
Accurate and reliable, small space
requirement
Analogue / Digital indicator, linear
measuring ranges
Physical measuring principle
Small stagnant volume, fast response
time
Remote range control and indication
Flow alarm sensor behind the measur-
ing cell
Status alarm, safety in operation
Thermostated version PMA 30/D, PMA 30A/D
in compact 19”-cassette
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 portable M&C oxygen analyser PMA 30
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-, fermentation
processes- and process or laboratory control
measurements.
Description
The M&C oxygen analyser PMA 30 is a temperature controlled instrument which has
been designed for continuous measurements
of oxygen concentrations in particle-free and
dry sample gas.
The PMA 30 is a reliable and easy-to-operate
instrument. It is built into a compact 19
inch cassette. 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 five measuring ranges are
displayed on the analogue meter with 30/
100% scale. The PMA 30A/D has a combined
analogue/digital meter and the PMA 30/D
has only a digital meter. Two output signals
are available. Sample gas connections as well
as connectors for incoming power supply,
output signals, remote ranging, remote range
indication and status contact are located at
the rear panel of the analyser. 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 and the flow alarm
sensor. The internal tubing is made of PTFE
and PVDF.
Measuring principle of M&C oxygen analyser
The PMA 30 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.
SIL
DIN EN 61508
Technical specications and illustrations are without
obligation, subject to modications. 05.97/11.12
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
13.4
Gas flow diagram PMA 30
1. External fine filter
2. Flowmeter with needle valve
3. Oxygen measuring cell PMA
4. Flow alarm sensor
Dimensions
1 2
3
4
FLA
3HE (129)
Dimensions in mm
0
0
Zero
Front view
28TE (142)
20
10
5
O -Analyser
2
PMA30
100
Ext.
Side view
230
32
60
40
30
80
15
VOL.% O
10
100
20
25
30
2
Status
Heater
Span
3
1
28
2
13.4
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. 05.97/11.12
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