Operating Manual
Portable Oxygene - Analyser
Type PMA 10 and PMA 10S
Gas sampling and gas conditioning technology 9-1.1-ME
2
Content
1 General information ................................................................................................................. 5
2 Declaration of conformity ........................................................................................................ 5
3 Safety instructions................................................................................................................... 6
4 Warranty ................................................................................................................................... 6
5 Used terms and signal indications ................................ ................................ ......................... 7
6 Introduction .............................................................................................................................. 8
6.1 Serial number ............................................................................................................ 8
7 Application ............................................................................................................................... 8
8 Technical data .......................................................................................................................... 9
9 Description ............................................................................................................................. 10
9.1 Front panel .............................................................................................................. 11
9.2 Gas flow diagram of the analyser PMA 10(S) ........................................................... 12
9.3 Options ................................................................................................................... 12
9.3.1 Approval according to 13. and 17. BImSchV and TA-Luft (not for PMA 10S) ...... 12
9.3.2 Output signal .................................................................................................... 12
9.3.3 Rechargeable battery........................................................................................ 12
9.3.4 Sample gas pump ................................................................ ............................. 12
9.3.5 Alarm contact outlet (not for PMA 10S) ............................................................. 12
10 The measuring principle........................................................................................................ 13
11 Receipt of goods and storage ............................................................................................... 14
12 Installation .............................................................................................................................. 14
12.1 Connection of Sample gas inlet and sample gas outlet ............................................. 15
13 Standard gas conditioning system ....................................................................................... 15
14 Electrical connection ............................................................................................................. 16
14.1 Signal output ........................................................................................................... 16
14.2 Option alarm contact output ................................ ..................................................... 16
14.2.1 Adjustment of the alarm threshold .................................................................... 17
15 Connections on the rear side ................................................................................................ 17
16 Starting up ................................................................................................ .............................. 18
16.1 Execution with rechargeable battery ........................................................................ 18
17 Calibration .............................................................................................................................. 18
17.1 Zero calibration ....................................................................................................... 19
17.1.1 Cross sensitivities ............................................................................................. 20
17.1.2 Consideration of cross sensitivities ................................................................... 21
17.2 Span calibration ...................................................................................................... 22
18 Measuring ............................................................................................................................... 23
19 Closing down ................................................................................................ ......................... 24
20 Maintenance ................................ ................................................................ ........................... 24
20.1 Check and change of the internal filter element ........................................................ 24
21 Trouble shooting.................................................................................................................... 25
22 Spare parts list ....................................................................................................................... 26
23 Appendix ................................................................................................................................ 26
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List of Illustrations
Figure 1 Dimensions ...................................................................................................... 10
Figure 2 Front panel....................................................................................................... 11
Figure 3 Gas flow diagram PMA 10(S) ............................................................................ 12
Figure 4 Scheme of the measuring cell and optical signal processing.............................. 13
Figure 5 Standard gas conditioning system .................................................................... 15
Figure 6 Plug connection signal output ........................................................................... 16
Figure 7 Rear side ......................................................................................................... 17
Figure 8 PMA 10(S) with open housing ........................................................................... 25
Figure 9 Component buildup .......................................................................................... 27
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This Operating Manual does not claim completeness and may be
subject to technical modifications.
© 07/1993 M&C TechGroup Germany GmbH. Reproduction of this
document or its content is not allowed without permission from M&C.
PMA® is a registered trade mark.
4th Edition: 12/2011
Dear customer,
we have made up this operating manual in such a way that all necessary information about the
product can be found and understood quickly and easily.
Should you still have any question, please do not hesitate to contact M&C directly or go through
your appointed dealer. Respective contact addresses are to be found in the annexe to this operating manual.
Please also contact our homepage www.mc-techgroup.com for further information about our
products. There, you can read or download the data sheets and operating manuals of all M&C
products as well as further information in German, English and French.
Gas sampling and gas conditioning technology 9-1.1-ME
5
HEAD OFFICE
M&C TechGroup Germany GmbH Rehhecke 79 40885 Ratingen Germany
Telephone: 02102 / 935 – 0
Fax: 02102 / 935 – 111
E - mail: info@mc-techgroup.com
www.mc-techgroup.com
1 GENERAL INFORMATION
The product described in this operating manual has been examined before delivery and left our
works in perfect condition related to safety regulations. In order to keep this condition and to
guarantee a safe operation, it is important to heed the notes and prescriptions made in this operating manual. Furthermore, attention must be paid to appropriate transportation, correct storage, as well as professional installation and maintenance work.
All necessary information a skilled staff will need for appropriate use of this product are given in
this operating manual.
2 DECLARATION OF CONFORMITY
CE - Certification
The product described in this operating manual complies with the following EC directives:
EMV-Instruction
The requirements of the EC directive 2004/108/EC “Electromagnetic compatibility“ are met.
Low Voltage Directive
The requirement of the EC directive 2006/95/EC “Low Voltage Directive“ are met.
The compliance with this EC directive has been examined according to DIN EN 61010 as well as
DIN 57721 for the voltage test of heating elements.
Declaration of conformity
The EU Declaration of conformity can be downloaded from the M&C homepage or directly requested from M&C.
Gas sampling and gas conditioning technology 9-1.1-ME
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3 SAFETY INSTRUCTIONS
Please take care of the following basic safety procedures when mounting, starting up or
operating this equipment:
Read this operating manual before starting up and use of the equipment. The information and
warnings given in this operating manual must be heeded.
Any work on electrical equipment is only to be carried out by trained specialists as per the regulations currently in force.
Attention must be paid to the requirements of VDE 0100 (IEC 364) when setting high-power electrical units with nominal voltages of up to 1000 V, together with the associated standards and
stipulations.
Check the details on the type plate to ensure that the equipment is connected to the correct
mains voltage.
Protection against touching dangerously high electrical voltages:
Before opening the equipment, it must be switched off and hold no voltages. This also applies to
any external control circuits that are connected.
The device is only to be used within the permitted range of temperatures and pressures.
Check that the location is weather-protected. It should not be subject to either direct rain or
moisture.
The device must not be used in hazardous areas.
Installation, maintenance, monitoring and any repairs may only be done by authorized personnel
with respect to the relevant stipulations.
4 WARRANTY
If the equipment fails, please contact M&C directly or else go via your appointed M&C dealer.
We offer a one year warranty as of the day of delivery as per our normal terms and conditions of
sale and assuming technically correct operation of the device. Consumables are hereby excluded. The terms of the warranty cover repair at the factory at no cost or the replacement at no
cost of the equipment free ex user location. Reshipments must be sent in a sufficient and proper
protective packaging.
Gas sampling and gas conditioning technology 9-1.1-ME
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DANGER!
This means that death, severe physical injuries and/or important
material damages will occur in case the respective safety measures
are not fulfilled.
W ARNIN G !
This means that death, severe physical injuries and/or important
material damages may occur in case the respective safety
measures are not fulfilled.
CAUTION!
This means that minor physical injuries may occur in case the
respective safety measures are not fulfilled.
CAUT ION!
Without the warning triangle means that a material damage may
occur in case the respective safety measures are not met.
ATT ENTIO N
This means that an unintentional situation or an unintentional
status may occur in case the respective note is not respected.
NOTE!
These are important information about the product or parts of the
operating manual which require user’s attention.
SKILLED STAFF
These are persons with necessary qualification who are familiar
with installation, use and maintenance of the product.
5 USED TERMS AND SIGNAL INDICATIONS
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6 INTRODUCTION
The portable M&C oxygen analyser PMA 10(S) is an non-thermostated instrument which has
been designed for continuous and discontinuous measurement of oxygen concentrations in dry
and particle-free sample gases.
6.1 SERIAL NUMBER
The type plate with the serial number is on the back side of the analyser.
Whenever you call M&C regarding questions or orders for the spares please give us the serial
number of your PMA 10(S).
7 APPLICATION
The PMA 10(S) is based on the magneto dynamic oxygen measuring cell of M&C.
This measuring principle is one of the most accurate methods for oxygen determination within the
range of 0 - 100 Vol.% O2. The robust measuring cell is unique in design and construction.
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 portable M&C oxygen analyser PMA 10(S) 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-, food packing machines-, ambient air- and laboratory process control measurements.
It is characterized by safety in operation, robustness, accuracy and the need of low maintenance.
Gas sampling and gas conditioning technology 9-1.1-ME
Oxygen analyser Series PMA
Version PMA 10 and PMA 10S
Part No.
PMA 10 : 01A1000 = 230V 50Hz, 01A1000a = 115V 60Hz
PMA 10S : 01A2000 = 230V 50Hz, 01A2000a = 115V 60Hz
Measuring ranges
selectable for 0-3, 0-10, 0-30 and 0-100 vol.% O2, linear
PMA 10S additional 9x% - 100% (e.g. 99% - 100%)
Indication
analogue / digital meter:
analogue meter selectable for each range with a scale of 0-30 and 0-100%
digital meter, 3 1/2 digit 9 mm high LCD for 0-100 % O2 reading, selectivity 0,1
vol.% O2
Output signal
0-1V DC, non-isolated, load > 100 KΩ, for each selected range;
Response time for 90% FSD
< 3 seconds at 60 Nl/hr air
Accuracy after calibration
analogue = ± 1% of span / digital = ± 0,1 vol.% O2 error of precision
PMA 10S within additional measuring range : ±3 Vol.% O2 of measuring range
Reproducibility
analogue = < 1% of span / digital = ± 0,1 vol.% O2 error
Influence of ambient temperature
zero point ± 0,02 vol.% O2 / °C; sensitivity ± 0,1 vol.% O2 / °C
Influence of barometric pressure
The oxygen reading varies in direct proportion to changes of the barometric
pressure.
Influence of sample gas flow
variation in gas flow between 0-60 Nl/hr air will cause a difference of < 0,1 vol.%
O2 .
Sample gas inlet pressure
0,01 up to 1 bar g, (PMA 10 required admission pressure for competent flow
rate, no pump inside)
Sample gas outlet pressure
Outlet of analyser must discharge freely into atmosphere.
Flow rate of sample gas
max. 60 Nl/hr air, adjustable with needle valve on the flowmeter 7-70 Nl/hr
Temperature of sample gas
-10 °C up to +40 °C, dry gas
Analyser temperature
according to ambient temperature, non heated version
Ambient temperature
-10 °C up to +55 °C
Storage temperature
-20 °C up to +60 °C, relative humidity 0-90% RH
Power supply
internal power unit for 230VAC standard or 115VAC available (a)* +/-10%, 4060Hz, 8VA
Electrical connections
mains supply: 3-pole chassis plug with 2m of cable; signal: 3-pole plug
Materials in contact with sample gas
Platinum, Glass, Polypropylene, Stainless Steel 316, FPM, Epoxy resin
Sample gas connection
PP-hose nipple for DN 11-4 mm tube
Protection / electrical standard
IP 41 EN 60529 / EN 61010
Housing / colour
portable plastic housing / gray
Dimension / weight
height 150 mm, width 202 mm, depth 260 mm / approx. 3 kg
Options
01A9000
Extra charge for signal output 4-20mA incorporated in the analyser PMA 10/10S (0-20mA on request), max.
burden 300Ω
01A9100
Extra charge for gas sample pump incorporated in analyser type PMA 10. Capacity: 0,9 Nl/min without
pressure.
01A9102
Extra charge for gas sample pump incorporated in analyser type PMA 10. Capacity: 1 Nl/min without
pressure.
01A9050
Extra charge for PMA 10 with battery operation, battery charger incorporated in the analyser
01A9150
Min.* oder Max.* Alarmkontakt, von 0-100% O2 einstellbar
Extra charge for alarm contact at analyser type PMA 10, adjustable from 0-100%O2. Potential-free chan-
geover contact with plug at the rear of the housing. (not for PMA 10S)
01A9155
Extra charge for PMA 10 with Piezo acoustic alarm and automatic reset (30 sec.) (only in combination with
alarm 01A9150). (not for PMA 10S)
01A9156
Extra charge for PMA 10 with Piezo acoustic alarm and manual reset (30 sec) (only in combination with
alarm 01A9150). (not for PMA 10S)
01A9160
Extra charge for qualification test according to TA-Luft + EN 14181 resp. 13. and 17. BImSchV of analyser
type PMA 10. Incl. signal output: 4-20mA (0-20mA on request) (not for PMA 10S)
8 TECHNICAL DATA
9
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NOT E!
The analyser is not thermostated and should be operated only in
areas with constant ambient temperature. If this is not possible, the
analyser has to be calibrated before every measurement, to guarantee the accuracy of measurement.
9 DESCRIPTION
The PMA 10 is a reliable and easy-to-operate instrument and immediately operable. The lightweight instrument is built into a portable housing. The four measuring ranges are displayed on
the analogue meter with 30% and 100% scale and the 100% O2 range also on the digital meter.
One output signal 0-1V is available as standard. Sample gas connections as well as a connector
for the output signal are located on the front panel of the analyser. The connectors for incoming
power supply and optional O2 alarm contact are located at the rear panel. The sample gas enters
the analyser via an internal protective fine-filter. The required flow rate can be adjusted at the
flowmeter with a needle valve, mounted on the front panel upstream the M&C measuring cell.
Options: mA-output signal, O2 alarm, rechargeable battery, internal pump and TÜV certificate.
The PMA 10S oxygen purity analyser, being an extended version of the PMA 10, is provided with
an electronic suppression system which enables oxygen purity measureents within the expanded
99-100 vol.% range. This measuring range is displayed on the analogue meter whilst the digital
indicator remains for the 0-100% reading. The electronic zero suppression system may be selected by means of a push button switch which is located on the control panel of the instrument.
The PMA 10S analyser can normally be used also for its standard PMA10 functions. Oxygen
purity measurements could only be made discontinuously. The measuring accuracy of the analyser can be maintained when calibration of the instrument with a certified gas takes place before
the measurement procedure in order to avoid influence of ambient temperature and pressure. A
measurement of 1 vol.% can be easily realized whilst the maximum value remains at 100 vol.%.
Other measurement within this range can be performed.
The physical measuring principle is based on the magneto-dynamic oxygen measuring cell and is
one of the most accurate methods for oxygen determination within the range of 0 - 100 Vol.% O2.
The measuring cell has a low volume of only 2 ml, is very robust, has an extremely low drift and
a very fast response time. The 90%-time is approximately 3 sec. and is achieved by a gas flow
rate of 60 Nl/hr through the measuring cell. The change of the flow in the range of 0 – 60 Nl/hr air
causes a change of the O2 indication of < 0,1 vol. % O2.
An internal power supply unit provides the analyser with the necessary supply voltage. At the rear
side there is the low heat device socket.
Figure 1 Dimensions
Gas sampling and gas conditioning technology 9-1.1-ME
9.1 FRONT PANEL
11
Figure 2 Front panel
1 Analog-/ digital-indication
2 Flow meter
3 Needle valve 7 – 70 Nl/hr
4 Alarm potentiometer – option (PMA 10) or LED active measuring range (PMA 10S)
5 Alarm-button – option (PMA 10) or switch for suppressed measuring range (PMA 10S)
6 Span potentiometer
7 Measuring range selector switch
8 Zero potentiometer
9 Sample gas - In DN 11-4 mm
10 Sample gas - Out DN 11-4 mm
11 Signal - Out 3-pole
At the rear side there are:
Low heat device socket with 2 fine fuses for power supply
Push button for battery check - Option
Switch for the sample gas pump - Option
3 pole bushing for alarm contact outlet - Option
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9.2 GAS FLOW DIAGRAM OF THE ANALYSER PMA 10(S)
1 Fine filter 3 Measuring cell
2 Flow meter with needle valve 4 Sample gas pump - Option
Figure 3 Gas flow diagram PMA 10(S)
9.3 OPTIONS
9.3.1 APPROVAL ACCORDING TO 13. AND 17. BIMSCHV AND TA-LUFT (NOT
FOR PMA 10S)
The approval happened by: Rheinisch-Westfälischer Technischer Überwachungs-Verein e.V. Essen. These devices have the label " TÜV eignungsgeprüft" at the front side. In connection with
this approval a 4 -20 mA output is always necessary.
9.3.2 OUTPUT SIGNAL
For output signal 0 – 1V an output signal 0 – 20 or 4 – 20 mA is available as option. The 3-pole
connection bushing is provided on the front panel of the analyser.
9.3.3 RECHARGEABLE BATTERY
The analyser PMA 10(S) can be finished with a rechargeable battery. Hereby an operation off the
line is possible. The internal mains adapter than simultaneously is used as battery charger.
9.3.4 SAMPLE GAS PUMP
A sample gas pump with a capacity of 1 l/min – without pressure can be integrated in the device.
The pump is designed for short time rating only. For long-term operation an external sample gas
pump has to be be used.
9.3.5 ALARM CONTACT OUTLET (NOT FOR PMA 10S)
It is possible to adjust the alarm value via a potentiometer on the front panel to any value and it is
switched as a min. or max. contact. The outlet is a potential-free change over contact that is lead
through via a plug at the rear side.
Additionally an acoustic alarm with automatic or manual reset (30 sec.) is integrable.
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2 4 3
1
GAS INLET
GAS OUTLET
10 THE MEASURING PRINCIPLE
Oxygen is a gas with a significant paramagnetic susceptibility. The molecules of oxygen are attracted much more strongly by a magnetic field than the molecules of other gases.
The measuring principle shown in the following is benefitting from these characteristics of the
oxygen. The great advantage of the paramagnetic measuring principle is the highly reduced
cross sensitivity of the measurement to other components in the sample gas.
Figure 2 shows the diagram of the measuring cell as well as the optical system for the detection
of the dumbbell’s movement.
Figure 4 Scheme of the measuring cell and optical signal processing
The measuring cell consists of two nitrogen-filled spheres which are arranged in the form of
a dumbbell. In the dumbbell’s central point of rotation, a small mirror is placed. The dumbbell
is surrounded by a wire coil needed for the compensation procedure. The described system is
fixed rotationally symmetrical inside a glass tube via a tightening strap out of platinum and is
srewed up with two pole pieces .
Two permanent magnets are producing an inhomogeneous magnetic field. When oxygen is flowing in, the molecues of the oxygen are drawn into the magnetic field. In consequence, the lines of
electric flux on the cuneiform pole pieces are compressed. The nitrogen-filled diamagnetic
sheres are pushed out of the magnetic field. This causes a rotation of the dumbbell. The rotation
is detected via an optical system consisting of mirror , projection LED and photoelectric cell
.
In case the dumbbell is pushed out of the magnetic fieild, the tension of the photoelectric cell is
immediately changed. The measuring amplifiers and are producing a respective current
which develops via the wire coil on the dumbbell an electro-magnetic load moment. The load
moment is resetting the dumbbell into its zero position.
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NOTE!
The oxygen analyser PMA 10(S) must be stored in a wheather protected and frost-proof area !
CAUTION!
The sample gas has to be dust free and dry to prevent a contamination and condensation in the analyser.
Basically always connect a fine filter (e.g. type FP-2T, Part No.
01F1200) upstream.
CAUTION!
In case of outdoor operation protect the analyser against sun,
wind and rain.
At the installation location constant climatic ambient conditions
(pressure, temperature) are necessary to prevent a distortion of
the measurement and a condensation in the measuring cell in
case the ambient temperature is falling below the dew point
temperature of the sample gas.
A vibration-free location is ideal for mounting; if this is not
possible, appropriate measures have to be taken. The analyser
must not be installed in direct proximity of heat sources.
The position of operation is not necessarily horizontal.
DANGER!
The analyser is allowed to be operated only in non-hazardous
areas and with non-ignitiable gases and gas mixtures.
Every change of the oxygen concentration produces a lineary proportional change of the compensation current and can be read directly in % O2 as oxygen value on the display .
Due to its very small stagnant volume (2 cm3) and the direct flow of the M&C measuring cell, an
extremely fast response time (T90-time) of 1 second for a high gas flow can be realized.
11 RECEIPT OF GOODS AND STORAGE
The analyser PMA 10(S) is a completely pre-installed unit.
Please take the analyser and possible special accessories carefully out of the packaging ma-
terial immediately after arrival, and compare the goods with the items listed on the packing list;
Check the goods for any damage caused during delivery and, if necessary, notify your trans-
port insurance company without delay of any damage discovered.
12 INSTALLATION
The PMA 10(S) is intended for mobile operation at always changing locations. In combination
with a good gas conditioning (e.g. PSS-5, Part No. 01G1100) a long lasting operability and a minimum of maintenance is guaranteed.
Gas sampling and gas conditioning technology 9-1.1-ME
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ATT ENTIO N
Avoid back pressure in the sample gas outlet because an increase
of pressure will distort the oxygen indication.
Do not bend the connection hoses.
+5°C
PMA 10
PMA 10(S)
12.1 CONNECTION OF SAMPLE GAS INLET AND SAMPLE GAS OUTLET
The sample gas inlet and outlet are placed on the front panel of the analyser and have a hose
nipple connection DN 11 – 4 mm.
Connect the sample gas inlet with a corresponding gas conditioning with e.g. a flexible
PVC hose DN4/6.
13 STANDARD GAS CONDITIONING SYSTEM
Figure 5 Standard gas conditioning system
1 : Heated gas sample probe (e.g. portable probe PSP4000-H)
2 : Heated gas sample line (e.g. PSP4M4/6)
3 : Sample gas cooler
4 : Peristaltic pump or condensate collecting vessel
5 : Diaphragm pump
6 : Fine filter (3 - 6 e.g. portable gas sampling system PSS-5)
Gas sampling and gas conditioning technology 9-1.1-ME
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W AR NING !
False supply voltage can damage the equipment. When connecting the equipment, please ensure that the supply voltage is
identical with the information provided on the model type plate!
Contact
Assignment
Explanation
Contact rating
1
mc
Tie point
max. 2A
max. 24VDC /100VAC
2
nc
Normally closed
3
no
Normally open
14 ELECTRICAL CONNECTION
At the rear side there is the low heat device socket. A 2m connection cable with low heat device
connector and earthing type plug is included in the scope of delivery.
14.1 SIGNAL OUTPUT
The PMA 10(S) has a signal output of 0 – 1V as standard, that is available in the chosen measuring range at the 3-pole bushing in the front of the analyser ( Pin 1/- und 3/+).
With option mA-output, additionally a signal of 0 - 20 mA or 4 - 20 mA is available at the 3-pole
bushing in the front of the analyser ( Pin 1/- und 2/+).
The output signals are not galvanically isolated.
For the connection of the signal output an adequate plug is provided.
Figure 6 Plug connection signal output
14.2 OPTION ALARM CONTACT OUTPUT
The alarm contact output is designed as MIN- as well as MAX-contact. Ex works the analyser is
delivered with a MAX-contact.
If a MIN-contact is favoured, the 4 screws of the front panel have to be removed and the switch
S2 on the alarm-board has to be switched. For output a relais contact (change over contact) and
optionally a buzzer is available. The intermitting buzzer switches off after 30 seconds automatically or has a manual reset as option. The relais contact is lead to a female plug at the rear side.
A corresponding plug with the following assignment is included in the scope of delivery (see also
Fig. 7) :
Gas sampling and gas conditioning technology 9-1.1-ME
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14.2.1 ADJUSTMENT OF THE ALARM THRESHOLD
For adjustment of the alarm treshold on the front panel there is a potentiometer marked with
“alarm” and aside a push-button:
Actuate the push-button and keep it pressed. Now the digital indication of the indication
instrument shows the alarm threshold.
Adjust the alarm threshold in the range of 0 – 100 % O2 at the alarm potentiometer with
suitable screw driver.
After adjustment of the desired alarm threshold release push button. The alarm threshold
now is adjusted and the digital indication again shows the current measurement.
The position of the measuring range selector switch is not relevant for the adjustment of the
alarm threshold.
15 CONNECTIONS ON THE REAR SIDE
Figure 7 Rear side
Low heat device socket with 2 fine fuses for power supply
Space for push-button for battery check - Option
Space for pump switch ON-OFF - Option
Space for 3-pole bushing for alarm contact output - Option
Gas sampling and gas conditioning technology 9-1.1-ME
18
W AR NING !
False supply voltage can damage the equipment. When connecting the equipment, please ensure that the supply voltage is
identical with the information provided on the model type plate!
CAUT ION!
If during transport the analyser was exposed to extreme
changes of temperature, an adequate time for temperature adaption has to be observed, to prevent condensation in the device.
NOTE!
Never fully discharge the battery (battery check indication < 83),
hereby the life time is reduced.
NOTE!
Before calibration it has to be assured that the calibration conditions correspond to the conditions during measurement. The
flow rate, the ambient temperature and the barometric pressure
conditions have to be constant. Under this terms a calibration of
the analyser is necessary aproximately one time a week to maintain the accuracy. If flow rate, ambient temperature or barometric pressure conditions are changing significantly, a new calibration is necessary.
During calibration the device must not be exposed to vibrations.
16 STARTING UP
Check electrical connections and gas connections.
Switch on mains voltage.
Turn measuring range selection switch from „0“ to the desired measuring range. The
analyser is ready for operation immediately.
16.1 EXECUTION WITH RECHARGEABLE BATTERY
Check charge condition of the battery. For that purpose actuate the push-button „battery check“
at the rear side of the device. The digital indication has to show a value of min. 83. Ist der Wert
geringer, muss der Akku aufgeladen werden. For this connect the low heat device connector of
the provided connection cable at the rear side with the low heat device socket and the earthing
type plug with the mains power. In position “0” of the measuring range selector switch the battery
is charged in approximately 14 hours.
The analyser with battery also can be operated alwaysat the mains.
17 CALIBRATION
The accuracy of an analyser mainly is dependent on its calibration.
For zero calibration of the analyser an oxygen-free gas, mostly nitrogen (N2 5.0) is used.
Gas sampling and gas conditioning technology 9-1.1-ME
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CAUT ION!
The outlet pressure is only allowed to be adjusted at max. 0,1 bar. Otherwise the measuring cell of the analyser will be destroyed.
NOTE!
Always calibrate at the flow rate that is adjusted for the measurement
too.
NOTE!
If a gas mixture is analysed, the single gas components have to be checked
concerning potential cross sensitivity and regarded for zero calibration. (see
chapter 17.1.1 and 17.1.2).
NOTE!
After zero calibration the span has to be calibrated too.
Output signal
Measurement
0-1 V
0 V
0-20 mA
0 mA
4-20 mA
4 mA
For span calibration with M&C O2-analysers it is possible to abandon on special test gas mixtures
because of the measuring principle and the linear measuring ranges. Dry and clean air is sufficient. For measurement concentrations > 40% O2 a calibration with corresponding test gas could
be possibly recommandable.
17.1 ZERO CALIBRATION
Connect a flexible PVC- or FEP-hose with the pressure reducer of the N2-zero-gas bottle.
The pressure reducer should have an output control range of max. 0 – 1,5 bar abs..
Op en the bottle valve and than the closed pressure reducer outlet valve and purge the
pressure reducer and the complete hose line for approximately 5 sec. the pressure reducer and the complete hose line.
Check the adjusted control pressure and reduce if necessary to ≤ 0,1bar, then shut off the
pressure reducer valve again.
Connect the hose end of the zero-gas bottle connection to the gas inlet of the analyser.
Open the pressure reducer valve slowly, to avoid pressure peaks.
Adjust the flow rate to 50 Nl/hr at the flow meter.
Wait approximately 20 – 30 sec. until the indication has stabilised.
If necessary adjust zero accurately to 0 % O2 with a screw driver at the zero potentiometer
in the front panel
Check output signals at 0,0% O2 :
Shut off pressure outlet valve and bottle valve.
Disconnect hose connection from the analyser. Schlauchverbindung am Analysator ent-
fernen.
Zero calibration is finished.
Gas sampling and gas conditioning technology 9-1.1-ME
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17.1.1 CROSS SENSITIVITIES
The following table shows the cross sensitivities of the most important gases at 20°C and 50°C.
All values are based on a zero calibration with N2 and a span calibration with 100 Vol.% O2. The
deviations are each valid for 100 Vol.% of the respective gas.
Gas Molecular 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 Butylen C4H
7
Chlorine Cl2 - 0,83 - 0,91
Diacetylene (CHCl)2 - 1,09 - 1,20
Nitrous monoxide 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 oxide 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 sulfide 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 - 0,27 - 0,31
Methylen chloride CH2Cl2 - 1,00 - 1,10
Methyl propene C4H8 - 0,94 - 1,06
Monosilan 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
Sulfur fluoride SF6 - 0,98 - 1,05
Monosilane SiH
4
Nitrogen N2 0,00 0,00
Nitrogen dioxide NO2 + 5,00 + 16,00
Nitrogen monoxide 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 (Steam) H2O - 0,03 - 0,03
Hydrogen H2 + 0,23 + 0,26
Xenon Xe - 0,95 - 1,02
- 0,94 - 1,06
- 0,24 - 0,27
Gas sampling and gas conditioning technology 9-1.1-ME
21
17.1.2 CONSIDERATION OF CROSS SENSITIVITIES
The selectivity of the above mentioned measuring principle is based on the high susceptibility of
oxygen to other gases (see table).
The following examples shall show how cross sensitivities can be considered for the zero calibration.
Example 1: Determination of the rest content of oxygen in a 100% carbon dioxide
(CO2) protective atmosphere at 20°C
In the table of cross sensitivities you can read the value for CO2 at 20°C of –0,27. This means
that for calibration with nitrogen the zero point must be set to +0,27% in order to compensate the
deviation of the display.
In this example, the atmosphere contains exclusively CO2 and O2. For this reason, the influence
of cross sensitivity can be eliminated without problem by using carbon dioxide (CO2) instead of
nitrogen for the zero calibration.
Example 2: Determination of 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 of above table are based on 100 Vol.% of the respective gases.
Therefore, a conversion must be maid to the effective volume concentration. In principle, the following is valid:
Table value * Volume concentration
Effective cross sensitivity = [Vol.%]
100
For the components of the gas mixture, the following values are found:
C2H6 : -0,0043 Vol.%;
CO2 : -0,1080 Vol.%;
N
: 0,0000 Vol.%.
2
= -0,1123 Vol.%
To determine the sum of cross sensitivity as exactly as possible, a correction factor has to be
determined, because the sum of cross sensitivities relates not on 100% but on 100% minus the
oxygen concentration (here 95%).
Gas sampling and gas conditioning technology 9-1.1-ME
22
NOTE!
After zero calibration the span has to be calibrated too.
CAUT ION!
The outlet pressure is only allowed to be adjusted at max. 0,1 bar. Otherwise the measuring cell of the analyser will be destroyed.
The correction factor is calculated as follows:
100
Correction factor =
(100 – O2-concentration)
It is incidental:
100
= 1,0526
(100 – 5)
For the gas mixture the rectified sum cross sensitivity then is calculated in good approximation:
1,0526 x -0,1123 Vol.% = -0,1182 Vol.%
The rectified sum cross sensitivity with change of sign now can be used for the correction of the
zero calibration. In this case zero had to be adjusted at +0,1182 Vol.%.
In case the cross sensitivities should be ignored in the above mentioned example, this would result in a relative error of approximately 2%.
17.2 SPAN CALIBRATION
Before span calibration a finished zero calibration is necessary.
Connect a flexible PVC- or FEP-hose with the pressure reducer of the N2-zero-gas bottle. The
pressure reducer should have an output control range of max. 0 – 1,5 bar abs..
Open the bottle valve and than the closed pressure reducer outlet valve and purge the
pressure reducer and the complete hose line for approximately 5 sec. the pressure reducer and the complete hose line.
Check the adjusted control pressure and reduce if necessary to ≤ 0,1bar, then shut off the
pressure reducer valve again.
Connect the hose end of the instrument air or check gas bottle connection to the gas inlet
of the analyser.
Open the pressure reducer valve slowly, to avoid pressure peaks.
Adjust the flow rate to 50 Nl/hr at the flow meter.
Gas sampling and gas conditioning technology 9-1.1-ME
23
NOTE!
Always calibrate at the flow rate that is adjusted for the measurement
too.
(Se – Snp) V resp. mA x gas concentration Vol % O2
upper range value Vol % O2
NOTE!
If during the span calibration great variations have to be compensated
(>2% O2) at the potentiometers, a second zero and span calibration is
reasonable.
CAUT ION!
The sample gas must be free from all liquid or solid particles, i.e. the dew
point of the gas must be below the equipment temperature so that no
condensate will occur inside the equipment. If necessary, lower the dew
point by means of a cooler or dryer. For dust filtration use a filter of 2
micron porosity !
We will be pleased to inform you about an optimal gas conditioning
Output signal
Measurement
range 100 % O2
Measurement
range 30 % O2
0-1 V
0,209 V
0,697 V
0-20 mA
4,18 mA
13,93 mA
4-20 mA
7,34 mA
15,15 mA
+ Snp
Wait approximately 20 – 30 sec. until the indication has stabilised.
If necessary adjust span accurately according to the check gas concentration with a screw
driver at the span potentiometer in the front panel. In case of air e.g. to 20,9 % O2.
Check output signals at 20,9% O2 :
Shut off pressure reducer valve and bottle- resp. Instrument air valve resp. integrated
sample gas pump.
Disconnect hose connection at the analyser.
Determination of the output signal:
Se = Final value, signal output
Snp = Zero, signal output
Shut off pressure reducer output valve and bottle valve. Druckreglerausgangsventil und
Flaschenventil schließen. Disconnect hose connection at the analyser.
The span calibration is finished.
18 MEASURING
For the first starting up at a new location, all steps in chapter 16 and 17 have to be performed.
By the requirements of precision the interval of the new calibration can be carried out daily or
weekly.
The analyser now is ready for operation.
Gas sampling and gas conditioning technology 9-1.1-ME
24
19 CLOSING DOWN
In case of a short time closing down of the the analyser no further precautions are required.
In case of a closing down of the analyser for a longer period, it is recommended to flush the analyser with dry and clean inert gas (eg. surrounding air) in order to prevent a damage of the measuring cell by aggressive and corrosive liquid gases.
For analyser with option rechargeable battery it is recommended for short or long term closing
down to remain the analyser at the mains. Hereby a deep discharge of the rechargeable battery
will be avoided and the device always is 100% ready for operation .
20 MAINTENANCE
The analyser, woking with a physical measuring principle, requires no intensive and complex
maintenance. But the preceding components necessary for the sample gas conditioning are to be
maintained with special attention according to the respective operating manuals.
The calibration of zero and span is to be effected with the corresponding test gases according to
stability of the operating conditions and to the demands on the accuracy. Recommended interval
of calibration for standard applications: 1 x per week.
20.1 CHECK AND CHANGE OF THE INTERNAL FILTER ELEMENT
The internal fine filter should be checked regularly for contamination and changed if necessary.
For a change the device has to be opened as follows:
Take analyser off the mains.
Loosen front quick-opening screw 1 of the handle.
Loosen corrugated-head screw of the right hinge pin, extract the pin and open the device.
Pull hose 7 off the filter inlet and unscrew filter body (4, 5, 6).
Unscrew filter element clamp 4 and change filter element 5.
Reassamble again in reverse order.
Gas sampling and gas conditioning technology 9-1.1-ME
25
Error
Possible reason
Check/Repair
No indication
No supply voltage
Check supply voltage according to type plate.
Check wether mains cable is plugged in accurate.
Check fine fuse in the low heat device socket.
No sample gas
flow
Sample line or filter is
blocked
Contamination of the internal diaphragm pump
Check sample system.
Loosen hose at the pump head and check
wether gas flow is present. Possibly open
pump head and clean valves, diaphragm and
pump head with a soap solution.
1 Quick-opening screw 5 Filter element
2 O2-transmitter-unit 6 Filter head with filter inlet
3 Filter body 7 Connection hose gas IN to filter
4 Filter element clamp
Figure 8 PMA 10(S) with open housing
21 TROUBLE SHOOTING
Gas sampling and gas conditioning technology 9-1.1-ME
26
Oxygen analyser PMA 10(S)
(C) Consumable parts
(R) Recommended spare parts
(S) Spare parts
Recommended quantity being in
operation [years]
Part No.
Indication
C/R/S
1 2 3
90 A 0100
Filter element 0,1µm glass fibre PMA 10(S)
C 4 8
12
90 A 0068
O-Ring internal filter PMA 10(S)
R 2 4
6
90 A 0020
Zero potentiometer 5k
S - -
1
90 A0025
Span potentiometer 1k
S - -
1
90 A 0010
Measuring cell PMC 1
S - -
1
90 A 0015
Flowmeter glass 7-70 Nl/h
R - -
1
90 A 0085
Signal output plug for PMA 10(S)
S - -
1
90 A 0070
Nipple PP for sample gas output PMA 10(S)
R - -
1
90 A 0075
Nipple PP for sample gas input PMA10(S).
R - -
1
90 A 0045
Spare pump 0,9l/min PMA 10(S)
S - 1
1
22 SPARE PARTS LIST
Wear, tear and replacement part requirements depend on specific operating conditions.
The recommended quantities are based on experience and they are not binding.
23 APPENDIX
Co mponent buildup
Further product documentation can be seen and downloaded from our home page:
www.mc-techgroup.com
Gas sampling and gas conditioning technology 9-1.1-ME
27
Figure 9 Component buildup
Gas sampling and gas conditioning technology 9-1.1-ME
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