M&C PMA 05 User manual

Gas sampling and gas conditioning technology 9-3.20-MD
Manual
Oxygen transmitter Model PMA 05

2 Gas sampling and gas conditioning technology 9-3.20-MD
Dear Customer,
We have organised this manual to enable you to find and understand all the necessary information
about the product quickly and easily.
If nevertheless you should still have questions regarding the product or its use, do not hesitate to
contact us directly at M&C, or your local dealer. Contact addresses can be found in the appendix
to this manual.
Please also consult our homepage www.mc-techgroup.com for further information about our
products. There you will find the manuals and product data sheets for all M&C products and other
information in German, English and French for download.
This manual does not purport to be complete and is subject to technical
changes.
© 01/2013 M & C TechGroup Germany GmbH. Reproduction of this
document or its contents is not allowed without the express permission
of M & C.
PMA®is a registered trademark.
2nd edition: 06/2013

9-3.20-MD Gas sampling and gas conditioning technology 3
Contents
1General information.............................................................................................................4
2Safety instructions ..............................................................................................................4
3Warranty...............................................................................................................................4
4Terminology and symbols used.........................................................................................5
5Description...........................................................................................................................6
6Technical specifications.....................................................................................................7
7Measurement method..........................................................................................................8
8Assembly..............................................................................................................................9
9Pneumatic connection ......................................................................................................10
10 Electrical connection.........................................................................................................10
11 Commissioning..................................................................................................................11
12 Calibrate .............................................................................................................................11
12.1 Zero point calibration.......................................................................................................12
12.1.1 Mechanical zero point adjustment ...........................................................................13
12.1.2 Interference effects..................................................................................................14
12.1.3 Consideration of cross-sensitivities .........................................................................15
12.2 End value calibration .......................................................................................................16
13 Cleaning..............................................................................................................................17
14 Decommissioning..............................................................................................................17
List of figures
Illustration1 Diagram of the measurement cell, and optical signal processing..............................8
Illustration 2 Dimensions................................................................................................................9
Illustration 3 Electrical connections transmitter PMA 05 ..............................................................10
Illustration 4 Calibration................................................................................................................12
Illustration 5 Setting the mechanical zero point............................................................................13

4 Gas sampling and gas conditioning technology 9-3.20-MD
Headquarters
M&C TechGroup Germany GmbHRehhecke 7940885 Ratingen,Germany
Tel: 02102 / 935 - 0
Fax: 02102 / 935 - 111
E-mail: [email protected]
www.mc-techgroup.com
1 GENERAL INFORMATION
The product described in this guide has been supplied in a safe and tested condition. For safe
operation and to maintain this condition, the information and instructions in this guide must be
followed. In addition, the appropriate transportation, proper storage and installation as well as
careful operation and maintenance are necessary.
For the proper use of this product, all information required for technical personnel is contained in
this manual.
2 SAFETY INSTRUCTIONS
Please note the following basic safety precautions when using the device:
• Read the manual before operation and use of the equipment! The instructions and warnings
in the manual must be followed.
• Work on electrical equipment may only be performed by qualified personnel in accordance
with the regulations currently in force.
• When connecting the device, ensure the correct supply voltage according to the datasheet.
• Use the device only in the permitted temperature ranges.
• Ensure installation is weather-protected. Do not directly expose to dust, rain or liquids.
3 WARRANTY
If the equipment fails, please contact M&C directly, or your authorised M&C dealer.
Provided that the device is used correctly, we undertake to provide a 1 year warranty from the date
of delivery according to our terms of sale. Consumables are not covered by the warranty. The
warranty covers free repair at the factory or free replacement of the device sent free to the point of
use. Returns must be made in sufficient and proper protective packaging.

9-3.20-MD Gas sampling and gas conditioning technology 5
4 TERMINOLOGY AND SYMBOLS USED
DANGER!
means that death, serious personal injury and/or substantial
property damage will result if proper precautions are not taken.
WARNING!
indicates that death, serious personal injury and/or substantial
property damage might occur if proper precautions are not taken.
CAUTION!
means that minor personal injury may result if proper precautions
are not taken.
CAUTION!
without a warning triangle symbol, indicates that property damage
may result if proper measures are not taken.
ATTENTION!
indicates that an undesirable result or an undesirable situation may
occur if the corresponding instructions are not followed.
NOTICE!
This is important information about the product or the appropriate
part of the manual to which particular attention should be paid.
SPECIALIST PERSONNEL
These are persons who are familiar with the installation, use,
maintenance, and operation of the product and have the necessary
skills through training or instruction.

6 Gas sampling and gas conditioning technology 9-3.20-MD
5 DESCRIPTION
M&C PMA 05 oxygen transmitters are suitable for continuous oxygen measurements in dry and
particle-free gases.
Due to the extremely fast response time, low stagnant volume, magneto-dynamic measuring cell
with negligible cross-sensitivity to other sample gas components, M&C 05 PMA oxygen
transmitters can be used in almost all applications.
They are a suitable and reliable analyser unit for oxygen monitoring in different processes, such as
flue gas monitoring, inerting systems, fermentation processes, process and laboratory
measurements, etc.
They are distinguished by reliability, robustness, accuracy and low maintenance.
The physical measurement method is based on the magneto-dynamic oxygen cell and is one of
the most accurate methods for the determination of oxygen in the range of 0-100% Vol.% O2.
The measuring cell has a low volume of only 2 ml and thus a very rapid response time. In addition,
it is subject to an extremely low drift.

9-3.20-MD Gas sampling and gas conditioning technology 7
6 TECHNICAL SPECIFICATIONS
PMA05 MB10
PMA05 MB01
Part No.
01A0510 (lowest measuring range
0-10 vol.% O2)
01A0520 (lowest measuring range
0-1 vol.% O2)
Measuring range
0-100 vol% O2 (standard), other
measuring ranges according to
client requirements
0-25 vol% O2 (standard), other
measuring ranges according to
client requirements
Measurement output
0-10V DC non-isolated and 4-20mA for the chosen range, non-isolated,
max. load 300Ω
Time for 90% value
<3 seconds at 60 l/h
Influence of barometric
pressure
the O2display varies proportionally with barometric pressure.
Heating according to each
selected transmitter
55 ° C
Temperature status contact
on transmitters with heating
Contact load max. 48V 1A AC/DC
Contact closes at Temp. > 50 ° C
Accuracy after calibration
deviation: analogue signal output = ±1% of span at range 3-100% / digital
indicator = ±0,1 vol.% O2
analogue signal output = ±2% of span at range 1%
Sample gas outlet pressure
the sample gas must flow without pressure out to atmosphere.
Influence of sample gas flow
variation in gas flow between 0-60 Nl/hr air will cause a difference of < 0,1
vol.% O2
Flow rate of sample gas
max. 60Nl/hr
Influence of ambient
temperature
no influence up to +45°C
Ambient/measurement gas
temperature
-10 ° C to +45 ° C
Storage temperature
-20 ° C to +60 ° C.
Ambient humidity
0-95% RH.
Electrical connection
12-pin connector
Power supply
24V DC max. 1.5A
Materials in contact with
medium
Platinum, glass, stainless steel 1.4571, viton, polypropylene, epoxy
Gas connections
Hose connection 4/6, other possible
Dimensions
115 x 115 x 112 mm (HxWxL)
Weight
1kg
Options
PT100 for thermostated version for temperature display or monitoring
Other measuring range than standard range
Zero suppression for spreading of measuring range
For more technical data please refer to the data sheets of your chosen transmitter.

8 Gas sampling and gas conditioning technology 9-3.20-MD
7 MEASUREMENT METHOD
Oxygen is a gas with strong paramagnetic properties. The molecules of the oxygen will be
influenced more than that of most other gases by a magnetic field.
The measuring method presented below takes advantage of these properties of oxygen. The great
advantage of the paramagnetic measuring principle is the greatly reduced cross-sensitivity of
measurement to the other components in the sample gas.
Figure 2 shows the diagram of the measuring cell, as well as the optical system, for detecting
motion of the dumbbell.
Illustration 1 Diagram of the measurement cell, and optical signal processing
The measuring cell consists of two nitrogen-filled hollow microspheres, which are formed by a
web on the dumbbell. In the centre of rotation of the dumbbell there is a small mirror. The
dumbbell is surrounded by a wire loop which is required for the compensation method. The above
system is fixed by a platinum straprotationally symmetrical in a glass tube and screwed with two
polepieces.
Two permanent magnets generate an inhomogeneous magnetic field. When oxygen flows in, the
oxygen molecules are drawn into the magnetic field. There is compression of the field lines of the
wedge-shaped pole pieces. The nitrogen-filled diamagnetic hollow microspheres are pushed out
of the magnetic field. This produces a rotational movement of the dumbbell. The rotary movement
is detected by means of an optical system consisting of mirrors, projection LEDand
photocell.
If the dumbbell is forced out of the magnetic field, the voltage of the photocell changes
immediately. The amplifiers (7)and (8) generate a corresponding current, which generates via
the wire loop on the dumbbell an electromagnetic countermoment. The countermoment returns the
dumbbell back to its zero position.

9-3.20-MD Gas sampling and gas conditioning technology 9
Any change in the oxygen concentration causes a linearly proportional change in the
compensation current and hence can be read directly as the oxygen value in % O2on a display.
Due to the very low stagnant volume (2 cm3) and the direct flow of the M&C measuring cell, an
extremely fast response time (T90 time) of the measuring cell of 1 second can be achieved at a
high gas flow rate.
8 ASSEMBLY
In the bottom panel of the transmitter four M4 holes are provided for mounting.
ATTENTION!
When mounting, ensure that no mechanical vibrations can be
transmitted to the transmitter.
Installation must be horizontal.
Illustration 2 Dimensions
View from below.
Mounting holes
Item
2
Item
3

10 Gas sampling and gas conditioning technology 9-3.20-MD
9 PNEUMATIC CONNECTION
The sample gas is connected via DN4/6 hoses on the sample gas inlet item 2 and on the sample
gas outlet item 3.
10 ELECTRICAL CONNECTION
Illustration 3 Electrical connections transmitter PMA 05
The electrical connection of the M&C PMA 05 oxygen transmitter is via the 12-pin. plug Item 9
(Figure 3). This is where the transmitter receives power and the measurement signal is transferred.
Terminal 11 + 12: Supply voltage 24V DC (max. 1.5 A) for heating and transmitter
Terminal 9 + 10: Temperature status contact for all versions with heating, in addition, these
versions have a non-reversible thermal fuse 72 °C
Terminal 7 + 8: Signal output 4-20mA (galvanically isolated) for the ordered measuring range e.g.
0-100% O2
Terminal 5 + 6: Signal output 0 - 10V (galvanically isolated) for 0 - 100% O2
Terminal 1 - 4 there are 4 terminal points available for optional features such as a PT100.
Item 9
Earth connection

9-3.20-MD Gas sampling and gas conditioning technology 11
11 COMMISSIONING
The following points must be taken into consideration on commissioning the M&C PMA 05 oxygen
transmitter in conjunction with an oxygen analyser.
Before switching on the device, check the electrical and pneumatic connections.
CAUTION!
The sample gas must be dust-free and dry in order to avoid
contamination and the dew point not being reached in the measuring
cell. If required, a reduction in the dew point can be made using a
cooler or drier.
Always install upstream a fine filter with at least 2 µm filtration (e.g.
type FP-2T, Art. No. 01F1200).
ATTENTION!
For correct operation, the PMA 05 oxygen transmitter may be
operated at a constant ambient temperature.
If the transmitter is equipped with heating, the measurement gas should be applied only after
heating of the transmitter. Temperature status contact closed.
12 CALIBRATE
Before performing calibrations, the system and process-specific safety measures must be
observed!
The measurement accuracy depends on the accuracy of the calibration of the transmitter.
The linearity of the measuring ranges enables two-point calibration of the zero point and the
measuring range end value.
The weekly calibration of the transmitter guarantees the required measurement precision. Because
of the direct proportional relationship between oxygen indication and barometric or process
pressure, in the event of major pressure variations, the calibration interval may be shortened
accordingly.
Calibration should be carried out under measurement conditions, i.e. at a constant flow rate, room
temperature and at constant barometric pressure.
ATTENTION!
Avoid vibrations during calibration and during measurement!

12 Gas sampling and gas conditioning technology 9-3.20-MD
12.1 ZERO POINT CALIBRATION
Zero point calibration of the transmitter takes place with an O2-free gas, such as nitrogen (N2) 5.0.
Set the zero gas flow rate with a needle valve or flow metre to a maximum of 60 l/h. The
flow rate of the calibration gas should always be adapted to the measurement-gas flow
rate;
Wait for approx. 30 seconds until the display has stabilised.
If necessary, adjust the zero point with the zero point potentiometer to 0% = 4mA. The zero
point potentiometer must then be located approximately in the central position. If the
position of the zero point potentiometer deviates grossly from the centre position, the
mechanical zero point must be corrected (see 12.1.1). Should this no longer be possible,
the measuring cell is expected to be replaced.
Illustration 4 Calibration

9-3.20-MD Gas sampling and gas conditioning technology 13
12.1.1 MECHANICAL ZERO POINT ADJUSTMENT
The mechanical zero point is set as follows:
Assign zero gas as described in 13.1.
Loosen fixing screw Item 4 of the photocell bracket.
Turn the adjustment screw Item 6 of the photocell clockwise or counter-clockwise until 0.0%
oxygen is indicated at the signal output;
Retighten fixing item 4 of the photocell bracket;
Illustration 5 Setting the mechanical zero point
Item 4
Item 6

14 Gas sampling and gas conditioning technology 9-3.20-MD
12.1.2 INTERFERENCE EFFECTS
The following list shows the cross-sensitivity of the major gases at 20 °C and 50 °C. All values are
based on zero point calibration with N2and end value calibration at 100% Vol. %O2. The
deviations apply as appropriate for 100% Vol. of the corresponding gas.
Gas Formula 20° C 50 °C
Acetaldehyde C2H4O - 0.31 - 0.34
Acetone C3H6O - 0.63 - 0.69
Acetylene C2H2 - 0.26 - 0.28
Ammonia NH3- 0.17 - 0.19
Argon Ar - 0.23 - 0.25
Benzene C6H6 - 1.24 - 1.34
Bromine Br2- 1.78 - 1.97
Butadiene C4H6 - 0.85 - 0.93
n-butane C4H10 - 1.10 - 1.22
Iso butylene C4H7 - 0.94 - 1.06
Chlorine Cl2- 0.83 - 0.91
Diacetylene (CHCl)2- 1.09 - 1.20
Nitrous oxide N2O - 0.20 - 0.22
Ethane C2H4 - 0.43 - 0.47
Ethylbenzene C8H10 - 1.89 - 2.08
Ethylene C2H4 - 0.20 - 0.22
Ethylene glycol (CH2OH) 2 - 0.78 - 0.88
Ethylene C2H4O2 - 0.54 - 0.60
Furan C4H4O - 0.90 - 0.99
Helium He + 0.29 + 0.32
n-hexane C6H14 - 1.78 - 1.97
Hydrogen chloride HCL - 0.31 - 0.34
Hydrogen fluoride HF + 0.12 + 0.14
Hydrogen sulphide H2S - 0.41 - 0.43
Carbon dioxide CO2- 0.27 - 0.29
Carbon monoxide CO - 0.06 - 0.07
Krypton Kr - 0.49 - 0.54
Methane CH4- 0.16 - 0.17
Methanol CH4O - 027 - 0.31
Methylene chloride CH2Cl2 - 1.00 - 1.10
Methylpropene C4H8- 0.94 - 1.06
Monosilane SiH4- 0.24 - 0.27
Neon Ne + 0.16 + 0.17
n-octane C8H18 - 2.45 - 2.70
Phenol C6H6O - 1.40 - 1.54
Propane C3H8 - 0.77 - 0.85
Propylene C3H6 - 0.57 - 0.62
Propylene chloride C3H7Cl - 1.42 - 1.44
Propylene oxide C3H6O - 0.90 - 1.00
Oxygen O2+100.00 +100.00
Sulfur dioxide SO2- 0.18 - 0.20
Sulphur hexafluoride SF6- 0.98 - 1.05
Silane SiH4- 0.24 - 0.27
Nitrogen N20.00 0.00
Nitrogen dioxide NO2+ 5.00 + 16.00
Nitrogen (mon)oxide NO + 42.70 + 43.00
Styrene C8H8 - 1.63 - 1.80
Toluene C7H8 - 1.57 - 1.73
Vinyl chloride C2H3Cl - 0.68 - 0.74
Vinyl fluoride CH3F - 0.49 - 0.54
Water (vapour) H2O - 0.03 - 0.03
Hydrogen H2+ 0.23 + 0.26
Xenon Xe - 0.95 - 1.02

9-3.20-MD Gas sampling and gas conditioning technology 15
12.1.3 CONSIDERATION OF CROSS-SENSITIVITIES
The selectivity of the above-mentioned measurement method is based on the great susceptibility
of oxygen to other gases (see table).
The following examples are intended to show how cross-sensitivities can be taken into account in
zero point calibration.
Example 1: Determining the residual oxygen content in 100% carbon dioxide
(CO2) inert gas atmosphere at 20 ° C.
From the table for CO2at 20° C, a value of -0.27 can be read for cross-sensitivity. This means that
during calibration with nitrogen, the zero point must be set to 0.27% in order to compensate for the
display declination in good approximation.
Since in this example there is only an atmosphere consisting of CO2and O2, the interference effect
can be eliminated easily by using carbon dioxide (CO2) for zero point calibration instead of nitrogen
(N2),
Example 2: Determining the oxygen content of a gas mixture at 20 °C.
1 vol% C2H6 (ethane);
5 vol% O2;
40 vol% CO2;
54 vol% N2.
Zero point calibration with nitrogen (N2).
The cross-sensitivity values in the above table are based on 100% by volume of the corresponding
gas. Therefore a conversion to the actual volume concentration has to be made. In general:
Table value x volume concentration
Actual cross-sensitivity =  [Vol.%]
100
For the components of the gas mixture the following values result:
C2H6 : -0.0043% by volume;
CO2 : -0.1080% by volume;
N2: 0.0000 Vol. %
= -0.1123% by volume
To determine as accurately as possible the actual total cross sensitivity, a correction factor must be
determined, since the sum of the cross sensitivities does not relate to 100% but to 100% minus the
oxygen concentration (here 95%).

16 Gas sampling and gas conditioning technology 9-3.20-MD
The correction factor is calculated:
100
Correction factor = 
(100 - O2 concentration)
This results in the following correction factor:
100
 = 1.0526
(100 –5)
For the gas mixture, the corrected total interference is therefore calculated to a good
approximation:
1.0526 x -0.1123 by volume% = -0.1182% Vol. %
The corrected total cross-sensitivity with change of prefix sign can now be used to correct the zero
point calibration. In this example the zero point would be adjusted to +0.1182% by volume.
A neglect of the cross sensitivity, in this example, would mean a relative error of about 2%.
NOTICE!
After zero point calibration the measuring range end value must
always be calibrated!
12.2 END VALUE CALIBRATION
Before the measuring range end value is calibrated, review of the zero point must always be made.
The procedure during calibration is as follows:
Set test gas flow rate with a needle valve or flow metre to a maximum. 60 l/h. The volume
flow of the calibration gas should always correspond to the gas volume flow;
Wait approx. 30 seconds until the display has stabilised.
If necessary, adjust, using the end value potentiometer the O2value of the test gas,
e.g. in the case of air to 20.9% = 7.344 mA in a measuring range 0 - 100% = 4 - 20 mA.

9-3.20-MD Gas sampling and gas conditioning technology 17
13 CLEANING
NOTICE!
In the event of external contamination, clean the transmitter only with
a cloth dampened with soapy water.
14 DECOMMISSIONING
For long-term shutdown, it is recommended to flush the transmitter with a dry, inert gas such
nitrogen, to prevent damage to the measuring cell by aggressive and corrosive humid gases.