M&C PMA Series User manual

Oxygen Analyzer Series PMA®
PMA 45K1
Instruction Manual
Version 1.00.01

2 PMA45K1 | 1.00.01 www.mc-techgroup.com
Dear customer,
Thank you for buying our product. In this instruction manual you will find all necessary information
about this M&C product. The information in the instruction manual is fast and easy to find, so you can
start using your M&C product right after you have read the manual.
If you have any question regarding the product or the application, please don’t hesitate to contact M&C
or your M&C authorized distributor. You will find all the addresses in the appendix of this manual.
For additional information about our products and our company, please go to M&C’s website
www.mc-techgroup.com. There you will find the data sheets and manuals of all our products in
German and English.
This Operating Manual does not claim completeness and may be sub-
ject to technical modifications.
© 0
3/2019 M&C TechGroup Germany GmbH. Repr
oduction of this
document or its
content is not allowed without permission from M&C.
PMA
®is a registered trade mark.
Version: 1.00.01

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Content
1General information.................................................................................................................... 4
2Declaration of conformity........................................................................................................... 4
3Safety instructions...................................................................................................................... 5
4Warranty...................................................................................................................................... 5
5Used terms and signal indications ............................................................................................ 6
6Introduction................................................................................................................................. 7
6.1 Serial number ........................................................................................................................ 7
6.2 Power supply ......................................................................................................................... 7
7Application .................................................................................................................................. 7
8Technical data............................................................................................................................. 8
9Description.................................................................................................................................. 9
10 Measuring principle.................................................................................................................. 11
11 Gas flow chart ........................................................................................................................... 12
12 Receipt of goods....................................................................................................................... 13
13 Installation................................................................................................................................. 13
14 Power supply connections....................................................................................................... 14
14.1 Sample gas inlet and outlet.................................................................................................. 14
14.2 Electrical connection ............................................................................................................ 14
14.3 Determination of the two measuring ranges to be selected on the instrument...................... 15
15 Starting up................................................................................................................................. 16
16 Calibration................................................................................................................................. 17
16.1 Zero point adjustment .......................................................................................................... 17
16.1.1 Cross sensitivities ......................................................................................................... 19
16.1.2 Consideration of cross sensitivities ............................................................................... 20
16.2 Sensitivity adjustment .......................................................................................................... 21
17 Measuring.................................................................................................................................. 23
18 Closing down ............................................................................................................................ 23
19 Storage ...................................................................................................................................... 23
20 Maintenance.............................................................................................................................. 23
21 Annexe....................................................................................................................................... 24
List of Illustrations
Figure 1 Dimensions of oxygen analyzer PMA 45K1 ......................................................................9
Figure 2 PMA 45K1 ......................................................................................................................10
Figure 3 Diagram of the measuring cell and optical signal processing..........................................11
Figure 4 Gas flow chart ................................................................................................................12
Figure 5 Electrical connections PMA 45K1 ...................................................................................15
Figure 6 Determination of measuring range via jumpers...............................................................16

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Head Office
M&C TechGroup Germany GmbH Rehhecke 79 40885 Ratingen Germany
Telephone: 02102 / 935 - 0
Fax: 02102 / 935 - 111
E - mail: [e-mail]
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. Fur-
thermore, 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 EU directives:
RoHS Directive
The requirements of the RoHS2 (‘Restriction of Hazardous Substances 2’) directive 2011/65/EU
and its annexes are met.
EMC-Instruction
The requirements of the EU directive 2014/30/EU “Electromagnetic compatibility“ are met.
Low Voltage Directive
The requirement of the EU directive 2014/35/EU “Low Voltage Directive“ are met.
The compliance with this EU directive has been examined according to DIN EN 61010.
Declaration of conformity
The EU Declaration of conformity can be downloaded from the M&C homepage or directly requested
from M&C.

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3 SAFETY INSTRUCTIONS
Please take care of the following basic safety procedures when mounting, starting up or oper-
ating this equipment:
Read this operating manual before starting up and use of the equipment. The information and warn-
ings 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.
The device must not be used in hazardous areas.
Check that the location is weather-protected. It should not be subject to either direct rain or moisture.
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.

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5 USED TERMS AND SIGNAL INDICATIONS
DANGER!
This means that death, severe physical injuries and/or important
material damages will occur in case the respective safety measures
are not fulfilled.
WARNING!
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 re-
spective safety measures are not fulfilled.
CAUTION!
Without the warning triangle means that a material damage may
occur in case the respective safety measures are not met.
ATTENTION
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.
High voltages!
Protect yourself and others against damages which might be caused
by high voltages.

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6 INTRODUCTION
The manual on hand describes the operating instructions for the stationary oxygen analyzer PMA
45K1 as applied within the industry.
6.1 SERIAL NUMBER
The type plate with the serial number is on the left side of the of the analyzer housing. Whenever you
call M&C regarding questions or orders for the spares, please give us the serial number of your
PMA 45K1.
6.2 POWER SUPPLY
The internal power supply of the oxygen analyzer PMA 45K1is 115 V AC or 230 V AC, for 40 Hz up to
60 Hz. Exact indications are made on the type plates. Deviations in the power supply of ±10% have no
influence on the proper functioning of the analyzer.
7 APPLICATION
The oxygen analyzer type PMA 45K1is suitable for the continuous use in order to determine the oxy-
gen concentration, also in nuclear power engineering installations. Measurements in dry and particle
free gases are possible. The inlet dew point of the gas must not exceed +40 °C.
The features of the analyzer are operation reliability, preciseness, stability of the measurement and a
small need of maintenance.
The measurement is based on the physical magneto-dynamic measuring principle and is one of the
most precise methods to determine the volumetric content of oxygen in the gas phase within the
measuring range of 0-100 vol% O2.
This measuring method shows only very little cross sensitivities vis-à-vis other measuring gas compo-
nents.
The gas flows directly against the measuring cell which is characterized by a small volume of only 2
cm3(small dead volume). Furthermore, the measuring cell stands out due to robustness, extremely
low drifts, a fast response time (T90 < 5 sec.), high pressure resistance of 16 bar in case of failure as
well as a density of smaller than 10-6 mbar x l/s (helium leak test).
Variations of the flow rate within a range of 0 Nl/h up to 60 Nl/h air produces a change in the oxygen
indication of lower than 0,2 vol% O2.
The measurements of process gases in nuclear power engineering areas are typical applications of
the PMA 45K1.

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8 TECHNICAL DATA
Oxygen Analyzer Series PMA®
Version PMA 45K1 heated oxygen analyzer in aluminium cast hous-
ing
Part-No.
05A4060 : PMA 45 K1, power supply 230 V 50 Hz
05A4060a :PMA 45 K1, power supply 115 V 60 Hz
Measuring ranges
2 measuring ranges selectable internally: 0-1, 0-2,5, 0-5, 0-10 and 0-
25 vol% O2linear and position EXTERN
Remote identification of measuring
range
Potential free contacts for each selected measuring range, capacity
max. 24 V DC, 0.5 A
Combined analogue/digital indication
Digital indication LCD 41/
2
digit, 9 mm high for measuring range 0-
100 % O2, selectivity 0.01% O2
Measuring range remote change-over
Measuring ranges selectable via external potential-free contacts
30 V DC 3 mA DC
Output signal
0-10 V DC, electrically isolated, load > 100 K
Ω
for 100 vol% measur-
ing range and 0-20 or 4-20 mA*for selected range, electrically isolat-
ed, max. Load 300/500 Ω
Status alarm
For minimum flow alarm, transmitter temperature < 40 °C, light source
defective, measuring system defective, failure of tension: LED-
indication and contact outlet: change-over contact, potential-free
, max.
24 V DC, 0.5 A
Response time for 90% value
< 5 seconds at 60 Nl/h air
Accuracy after calibration
Deviation: analogue signal output = ±1 % of span 2.5 – 25 % / Digital
indication = ±0.1 vol% O2, = ±2 % of span 1%
Reproducibility
Analogue output = < 1 % of span /
Digital indication = ± 0.1 vol% O2
Influence of ambient temperature
No influence up to 50°C
Influence of barometric or outlet pres-
sure
The O
2
indication varies proportionally to the barometric or outlet
pressure
Influence of the sample gas quantity
Variation between 0-60Nl/h air will cause a change of indication
<0.2 vol% O2
Sample gas quantity
Max. 60 Nl/h
Flow alarm
Thermal conductivity sensor in measuring cell outlet
Pressure resistance
Operating pressure max. 0.6 bar, accident resistance max. 16 bar
Density
Leak rate < 10-6 mbar x l/s with He leak test
Gas volume of the sample gas way
ca. 12 ml
Sample gas temperature
-10 °C up to +50 °C dry gas
O2 Transmitter temperature
Adjusted at works to 55 °C
Ambient temperature
-10 °C up to +50°C
Storage temperature
-20 °C up to +60 °C, relative humidity 0-90% rF
Power supply
Internal power supply unit available for 230VAC standard or 115 V AC
(a)* ±10 %, 40-60 Hz, 35.5 VA
Electrical connections
Clamps 2.5 mm2, 4 x M20 cable gland ø11-13.5 mm (power supply,
signals, span position and remote selection, status alarm)
Material of parts in contact with sam-
ple gas
Platinum, glass, stainless Steel 1.4571, Epoxy
Sample gas connections
1/4“ NPT i
Protection
IP 54 EN 60529
Applied standards
Electrical safety EN 61010 part 1 8.2002
EMC: Interference emission EN 61000 part 6-3:2007 and EN 61000-6-
4:2007, Interference resistance EN 61000 part 6-2:2006
Housing / Colour
Alu cast housing for wall mounting / blue
Dimensions / Weight
356 x 275 x 200 mm / h x w x d / approx. 20 kg
OPTIONS EN for exchange of outdat-
ed instruments
1.: 2 connecting pipes 1/8“, 500 mm long and 2 tube fittings –
straight connection
2.: Adaption mounting plate with fastening material
*Please specify with your order.

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9 DESCRIPTION
The core of the PMA 45K1 is the patented magneto dynamic oxygen measuring cell. The measuring
principle is one of the most precise methods for the volumetric determination of the oxygen content in
the measuring range of 0-100 vol% O2.
The oxygen analyzer PMA 45K1 is designed for the stationary use and can also be applied in nuclear
installations. The characteristics of this analyzer are overpressure security up to 16 bar as well as a
guaranteed leak tightness with a leak rate of less than 10-6 mbar xl/s.
The transmitter is set to a temperature of +55 °C. The temperature regulator is constructed such as
the low voltage device and the 115/230 V power part are separated via an opto-isolator with no volt-
age switch.
A non-reversible overpressure fuse avoids that the transmitter is overheated above 72 °C.
The great surface heating elements mounted on the transmitter surface guarantee a quick and con-
stant temperature circulation.
In order to ameliorate the heat storage and isolation, the transmitter is equipped with an insulation
cover.
Figure 1 Dimensions of oxygen analyzer PMA 45K1

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Figure 2 PMA 45K1
An inspection window in the housing 1of the analyzer makes it possible to control the measuring val-
ue display 2, the LEDs 6 (status alarm) and 7 (heating regulation) as well as the span LEDs 11 and
12.
All operating devices are accessible from outside and guarantee a simple and user-friendly handling
for calibration as well as for the measuring range switch over.
The operating devices are:
•Adjustment of measuring range final value 3,
•Measuring range selector switch 4and
•Adjustment zero point 5.
The oxygen indication of the PMA 45K1is made by a digital display instrument 2. Here, the oxygen
value is shown within a range of 0-100.00 vol% with a definition of 0.01 vol%.
The measuring range switch over is made via the selector switch 4. The selected measuring range is
indicated via a respective LED 11 on the front plate of the PMA 45K1.
The selection of the measuring range can also be effected externally. The LED 12 on the front plate of
the analyzer in connection with the respective measuring range LED is signalizing the external meas-
uring range control.
The function of the analyzer heating is indicated with LED 7. When switching on the instrument, this
LED is permanently illuminated in yellow. When the LED is flashing, the operating temperature is
achieved, when the LED is out, the temperature is exceeded. For all other status alarms as described
below, the LED 6changes from green to read.

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The standard PMA 45K1is equipped with a collective alarm output. This is a potential-free changeo-
ver contact in “safety-first position”. The capacity is 110 mA at 24 V. The following status indications
are signalized:
Light source defective,
Measuring cell uncoupled,
Flow alarm <10 / >70 Nl/h ,
Error control of power supply unit,
Power supply failure,
Temperature Transmitter <+45 °C / >+60 °C,
Fault measuring range selection.
Power supply, mV- or mA-output, remote measuring range selector as well as alarm output are effect-
ed via the cable inlets 10 on the lower side of the analyzer housing.
Sample gas inlet 8 and outlet 9with ¼“ NPT i thread are also placed on the bottom side of the hous-
ing.
10 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 3 shows the diagram of the measuring cell as well as the optical system for the detection of the
dumbbell’s movement.
2
4
3
1
GAS INLET
GAS OUTLET
7
8
5
6
9
Figure 3 Diagram of the measuring cell and optical signal processing

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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 sur-
rounded by a wire coil needed for the compensation procedure. The described system is fixed rota-
tionally symmetrical inside a glass tube via a tightening strap out of platinum and is screwed up with
two pole pieces .
Two permanent magnets are producing an inhomogeneous magnetic field. When oxygen is flowing in,
the molecules 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 spheres 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 field, the tension of the photoelectric cell is imme-
diately changed. The measuring amplifiers and are producing a respective current which devel-
ops via the wire coil on the dumbbell an electro-magnetic load moment. The load moment is resetting
the dumbbell into its zero position.
Every change of the oxygen concentration produces a linear 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 ex-
tremely fast response time (T90-time) of 1 second for a high gas flow can be realized.
11 GAS FLOW CHART
Figure 3 shows the gas flow chart of the oxygen analyzer PMA 45K1.
Sample gas inlet,
Tube fitting 1/8“
Sample gas outlet,
Tube fitting 1/8“
2
1
1/8" stainl.steel
tube
1 Analyser housing
2 Measuring cell
Figure 4 Gas flow chart

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The sample gas arrives in the measuring cell 2via the inlet fitting.
It is very important to protect the measuring cell 2against liquid and dust particles. This is the reason
why the externally mounted upstream gas conditioning system must be equipped with a fine filter of at
least 2 micron porosity (e.g. type FP-2T).
The gas volume flow of 6 Nl/h up to 60 Nl/h is adjusted via an externally mounted flowmeter with nee-
dle valve.
12 RECEIPT OF GOODS
The analyzer PMA 45K1 is a completely pre-installed unit.
•Please take the analyzer and possible special accessories carefully out of the packaging material
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 transport
insurance company without delay of any damage discovered.
NOTE!
The oxygen analyzer must be stored in a weather - protected and frost-
proof area !
13 INSTALLATION
The analyzer PMA 45K1 is constructed for stationary wall mounting. All electrical connections are to
be found inside the analyzer housing.
The correct installation as well as an optimal sample gas conditioning unit mounted upstream – if nec-
essary with an appropriate gas sample probe – guarantee a long lasting functioning and a minimum of
maintenance.
CAUTION!
In case of outdoor operation, the analyzer must be protected
against sun, wind and rain.
At the installation location constant climatic ambient conditions
(pressure, temperature) are necessary to prevent a falsification
of
the measurement
due to changing barometric pressure. Further,
there is the risk of condensation in case the ambient temperature
falls below the dew point temperature of the sample gas in front of
the measuring cell.
A vibration-free location is ideal for mounting; if this is not possi-
ble, rubber-bonded metals (anti-
vibration) have to be mounted in
order to decouple the housing. The analyzer
must not be installed
in direct proximity of heat sources.
NOTE!
The sample gas must be dry and free of dust to avoid contamina-
tions and a falling below the dew point inside the analyzer. In prin-
ciple, a fine filter with a porosity of minimum 2 micron should be
installed upstream.
Counter pressure in the sample gas outlet should be avoided!

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14 POWER SUPPLY CONNECTIONS
14.1 SAMPLE GAS INLET AND OUTLET
Sample gas inlet and outlet (8, see figure 2) are placed on the lower side of the analyzer. These are
1/4“ NPT i threads.
NOTE!
When fastening the screw connection, hold up at the back s
ide with a
respective spanner!
It is recommended to make a leak test afterwards.
The sample gas must be dry and free of dust, and the sample gas inlet temperature should not exceed
+50 °C. If this is not the case, a gas cooler with automatic condensate evacuation must be mounted
upwards.
The sample gas outlet should have atmospheric pressure if possible because a pressure increase
inside the measuring cell will falsify the oxygen indication. The maximum inlet pressure is 600 mbar.
The sample gas quantity should be adjusted according to the requirements between 6 Nl/h and
60 Nl/h air (external flowmeter).
14.2 ELECTRICAL CONNECTION
WARNING!
False supply voltage can damage the equipment. When connect-
ing the equipment, please ensure that the supply voltage is iden-
tical with the information provided on the model type plate!
Take care that the instrument hat got a sufficient
connection to
earth!
NOTE!
Attention must be paid to the requirements of IEC 364 (DIN VDE
0100) when setting high-power electrical units with nominal volt-
ages of up to 1000V, together with the associated standards and
stipulations!
A main switch and a respective fuse must be provided externally by the client.
After removing the window cover, the electrical connections are freely accessible.
•In order to remove the window cover, unscrew the safety screw (hexagon socket screw) with a
hexagon key 2.5 mm;
•Unscrew the window cover by turning it counter-clockwise with the help of a flat iron with the di-
mensions 10 x 10 x 300 mm (H x L x L);
•Unscrew the fixing screws on the front plate and remove the front plate carefully (take care of the
connecting cables of the front plate).
The electrical connections are to be made according to figure 5.

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Figure 5 Electrical connections PMA 45K1
14.3 DETERMINATION OF THE TWO MEASURING RANGES TO BE SELECTED ON
THE INSTRUMENT
In order to minimize operating errors, the PMA45K1 provides the possibility to determine two measur-
ing ranges that may then be selected via a switch on the instrument.
The selection of measuring range 1 and 2 is made via two jumpers on the below illustrated plate. On
the photo, you can see that for range 1 the 1 % measuring range has been selected and for range 2
the 2.5 % measuring range. The selected measuring ranges refer only to the mA-outlet. The digital
indication is always in the 100.00 vol% O2measuring range.
Via the external measuring range selection, all measuring ranges are available.

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Figure 6 Determination of measuring range via jumpers
15 STARTING UP
The following steps have to be done when starting up the analyzer:
•Before switching on the main switch, check whether the electrical connections and the gas connec-
tions have been executed correctly. The tension as indicated on the type plate must correspond to
the power supply.
•When switching on, the display of the analyzer shows an oxygen value < 21 vol% due to the ambi-
ent air inside the measuring cell;
•The warming up time of the analyzer is indicated by the permanently illuminated temperature con-
trol LED on the front plate (7, see figure 2). After approximately 30 minutes, the PMA 45K1 has
achieved its transmitter temperature. This is signalized by the twinkling of the temperature control
LED.
NOTE !
A stable temperature, however, is only achieved after appr. 3 hours, and
the analyzer can then be calibrated according to the following instruc-
tions. In order to control the stabl
e status, it is recommended to execute
a further calibration after 24 hours!

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16 CALIBRATION
The preciseness of an analyzer depends to an important extent on its calibration.
NOTE!
Before executing a calibration, it must
be assured that the calibration
conditions correspond to the conditions during the measurements. The
flow quantity and the barometric pressure conditions must be constant.
Under these conditions, a calibration of the analyzer
becomes necessary
nearly once a week in order to keep the exactness. Should there, howev-
er, be a considerable change of the flow quantity or the barometric pres-
sure conditions, a new calibration is necessary.
During the calibration, the instrument must not be exposed to any vibra-
tions.
For the zero point calibration of the analyzer, an oxygen-free gas – in most times nitrogen (N25.0) is
used as zero gas.
Regarding the sensitivity adjustment, no special test gas mixtures are necessary due to the measuring
principle and the linearly measuring ranges of the M&C O2analyzers. Dry and clean air is sufficient.
For measuring value concentrations of > 40 % O2, it may be recommendable to make a calibration
with a respective test gas.
16.1 ZERO POINT ADJUSTMENT
•Connect a flexible PVC or Viton tube with the pressure reducer of the N2zero gas bottle.
The pressure reducer should have got an output range of adjustment of max. 0 – 1.5 bar.
•Open the cylinder valve first and then open the closed output valve of the pressure con-
troller. Purge the pressure controller including the tubes for approx. 5 seconds.
•Check the adjusted pressure and reduce it if necessary to ≤0.1 bar, then close the output
valve of the pressure controller again.
•Connect the free tube end of the zero gas bottle connection to the gas inlet of the analyzer
or – if existing – to the external calibration valve.
•Open slowly the pressure controller output valve in order to avoid pressure peaks.
•Adjust the flow at approx. 50 l/h on the flowmeter.
NOTE!
Always calibrate with the same gas quantity that is taken for measure-
ment.
•Wait approx. 20 - 30 seconds until the indication is stable.
•Turn the measuring range selector switch (4, see figure 2) in position 2.5 %.
•If necessary, adjust the zero point with a screw driver to exactly 0 % O2 on the zero point
potentiometer (5, see figure 2) on the bottom side of the housing.
•Check the signals of the recorder output at 0.0% O2:
Recorder output signal
Measured
value
0-10 V
0 V
0-20 mA
0 mA
4-20 mA
4 mA

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NOTE!
When analysing a gas mixture, the single components have to be
checked whether there are cross sensitivities, and these have to be con-
sidered during the zero point calibration (see chapter 16.1.1 and 16.1.2).
•Close the pressure controller output valve and the cylinder valve.
•Remove the tube connection from the analyzer.
•The zero point calibration is finished.
NOTE!
After the zero point calibration, also the final value has to be calibrated
again.

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16.1.1 CROSS SENSITIVITIES
The following list shows the cross sensitivities of the most important gases at 20 °C and 50 °C. All val-
ues refer to a zero point calibration with N2and a final value calibration with 100 vol% O2. The devia-
tions apply for 100 vol% each of the respective gases.
Gas Elemental Formula 20°C 50°C
Acetaldehyde C2H4O - 0.31 - 0.34
Acetone C3H6O - 0.63 - 0.69
AcetyleneC2H2- 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
Isobutylene 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
Ethan C2H4- 0.43 - 0.47
Ethyl benzene 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
HeliumHe + 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 - 0.27 - 0.31
Methylen chloride CH2Cl2- 1.00 - 1.10
Methyl propylene C4H8- 0.94 - 1.06
Monosilan SiH4- 0.24 - 0.27
Neon Ne + 0.16 + 0.17
n-Octane C8H18 - 2.45 - 2.70
PhenolC6H6O - 1.40 - 1.54
Propane C3H8- 0.77 - 0.85
Propylene C3H6- 0.57 - 0.62
Propylene chloride C3H7Cl - 1.42 - 1.44
Propylene oxideC3H6O - 0.90 - 1.00
Oxygen O2+100.00 +100.00
Sulphur dioxide SO2- 0.18 - 0.20
Sulphur fluoride SF6- 0.98 - 1.05
Hydro silicone SiH4 -0.24 - 0.27
Nitrogen N20.00 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 (vapour) H2O - 0.03 - 0.03
Hydrogen H2+ 0.23 + 0.26
Xenon Xe - 0.95 - 1.02

20 PMA45K1 | 1.00.01 www.mc-techgroup.com
16.1.2 CONSIDERATION OF CROSS SENSITIVITIES
The selectivity of the above mentioned measuring principle is based on the high susceptibility of oxy-
gen 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 CO2and O2. For this reason, the influence of
cross sensitivity can be eliminated without problem by using carbon dioxide (CO2) instead of nitrogen
(N2) for the zero calibration.
Example 2: Determination of the oxygen content of a gas mixture at 20°C
1 vol% C2H6(Ethan);
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 made to the effective volume concentration. In principle, the following is valid:
Table value x 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.%;
N2 : 0.0000 Vol.%.
∑= -0.1123 Vol.%
To determine the sum of cross sensitivity as exactly as possible, a correction factor has to be deter-
mined, because the sum of cross sensitivities relates not on 100 % but on 100 % minus the oxygen
concentration (here 95 %).