M&C PMA Series User manual

Oxygen – Analyzer Series PMA®
PMA 30/D, PMA 30/A/D
Instruction Manual
Version 1.01.03

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Dear customer,
Thank you for buying our product. In this manual you will find all necessary information about this M&C
product. The information in the 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 our products in German and
English.
T
his Operating Manual does not claim completeness and may be subject to
technical modifications.
© 04/2023 M&C TechGroup Germany GmbH. Reproduction of this document or
its content is not allowed without permission from M&C.
With the release of this version all older manual versions will no longer be valid.
T
he German instruction manual is the original instruction manual. In case of ar-
bitration only the German wording shall be valid and binding.
PMA®is a registered trade mark.
Version: 1.01.03

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Content
1General information ............................................................................................................................................... 5
2Declaration of conformity ..................................................................................................................................... 5
3Safety instructions .................................................................................................................................................. 6
4Warranty ................................................................................................................................................................... 6
5Used terms and signal indications....................................................................................................................... 7
6Introduction ............................................................................................................................................................. 8
6.1 Serial number ............................................................................................................................................................................. 8
6.2 Power supply.............................................................................................................................................................................. 8
7Application ............................................................................................................................................................... 8
8Technical data.......................................................................................................................................................... 9
8.1 Options........................................................................................................................................................................................10
9Description ............................................................................................................................................................. 11
9.1 Front panel ................................................................................................................................................................................12
9.2 Option process pressure compensation type PD (without SIL certification)............................................13
9.3 Option zero suppression with process pressure compensation type SD/PD (without SIL-
certification) ..............................................................................................................................................................................13
10 The measuring principle...................................................................................................................................... 13
11 Gas flow diagram of the analyzer PMA 30 ....................................................................................................... 14
12 Receipt of goods and storage............................................................................................................................. 15
13 Installation.............................................................................................................................................................. 16
13.1 Connection of Sample gas inlet and sample gas outlet .....................................................................................16
13.2 Standard gas conditioning system ................................................................................................................................17
13.3 Electrical connection ............................................................................................................................................................17
13.3.1 Analog signal output ....................................................................................................................................................18
13.3.2 Description 0/4-20mA outlet ....................................................................................................................................19
13.3.3 Adjustment of the current signal outlet..............................................................................................................19
13.3.4 Adjustment of the load................................................................................................................................................19
13.3.5 Adjustment of the max. current signal at the mA-outlet............................................................................19
13.3.6 Description 0-10 V outlet ............................................................................................................................................20
13.3.7 Status signal.......................................................................................................................................................................20
13.3.8 Remote range control and External measuring range indication...........................................................21
14 Starting up.............................................................................................................................................................. 22
15 Calibration .............................................................................................................................................................. 22
15.1 Zero calibration .......................................................................................................................................................................22
15.2 Span calibration ......................................................................................................................................................................24
16 Measuring............................................................................................................................................................... 25
17 Cross sensitivities .................................................................................................................................................. 27
18 Closing down ......................................................................................................................................................... 30
19 Storage and Transport ......................................................................................................................................... 30
20 Maintenance .......................................................................................................................................................... 30
20.1 Removal of the measuring cell ........................................................................................................................................31
20.2 Mechanical zero point adjustment................................................................................................................................33
21 Trouble shooting................................................................................................................................................... 35
22 Proper disposal of the device ............................................................................................................................. 36
23 Spare parts list ....................................................................................................................................................... 36
24 Appendix................................................................................................................................................................. 37

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List of Illustrations
Figure 1 Dimensions PMA30 ..............................................................................................................................................................11
Figure 2 Front panel PMA 30..............................................................................................................................................................12
Figure 3 Scheme of the measuring cell and optical signal processing.........................................................................14
Figure 4 Gas flow diagram PMA 30 .................................................................................................................................................14
Figure 5 Standard gas conditioning system ...............................................................................................................................17
Figure 6 Back side PMA 30...................................................................................................................................................................18
Figure 7 Pin assignment of D-sub-connector X4 .....................................................................................................................20
Figure 8 Pin assignment of D-sub-connector X1 .....................................................................................................................21
Figure 9 Transmitter unit.........................................................................................................................................................................32
Figure 10 Schematic view of the transmitter unit ..............................................................................................................34
Figure 11 Circuit diagram PMA30 main board .....................................................................................................................40
Figure 12 Assembly diagram PMA 30 main board..............................................................................................................41
Figure 13 Circuit diagram PMA 30 front board ....................................................................................................................43
Figure 14 Assembly diagram front board PMA 30..............................................................................................................44
Figure 15 Circuit diagram extension board PMA 30..........................................................................................................45
Figure 16 Assembly diagram extension board PMA 30 ...................................................................................................46
Figure 17 Connections wall mounting housing PMA 30.................................................................................................47
Figure 18 PMA 30 in wall mounting housing........................................................................................................................48

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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: [email protected]
www.mc-techgroup.com
1GENERAL 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 oper-
ation, it is important to heed the notes and prescriptions made in this operating manual. Furthermore, at-
tention 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 operat-
ing manual.
2DECLARATION OF CONFORMITY
CE - Certification
The product described in this operating manual complies with the following EU directives:
EMV-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.
The SIL – Declaration of conformity can be directly requested from M&C
Electrical equipment standard
The electrical equipment standard meets the safety requirements of the following norms and standards: EN
61010.

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3SAFETY 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 cur-
rently 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 re-
spect to the relevant stipulations.
4WARRANTY
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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5USED 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 ful-
filled.
CAUTION!
This means that minor physical injuries may occur in case the respective
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 oper-
ating manual which require user’s attention.
SKILLED STAFF
These are persons with necessary qualification who are familiar with in-
stallation, use and maintenance of the product.
High voltages!
Protect yourself and others against damages which might be caused by
high voltages.
Hot surface!
Contact may cause burn! Do not touch!
Wear protective gloves!
Working with chemicals, sharp objects or extremely high temperatures
requires wearing protective gloves.

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6INTRODUCTION
The M&C oxygen analyzer PMA 30 is a temperature-controlled instrument which has been designed for
continuous measurements of oxygen concentrations in particle free and dry sample gas.
6.1 SERIAL NUMBER
The type plate with the serial number is on the back of the analyzer.
Whenever you call M&C regarding questions or orders for the spares please give us the serial number of your
PMA 30.
6.2 POWER SUPPLY
The power supply of the oxygen analyzer PMA 30 is 115 V or 230 V AC, 40–60 Hz. The specification is on the
type plate. Variations of the power supply of 15 % have no influence on the functionality of the analyzer.
7APPLICATION
The Oxygen Analyzer PMA 30 is suitable for the continuous measurement of oxygen in particle-free and dry
sample gases with a maximum dew point of 5 °C.
The features of the anaylzer are safe operation, accuracy and low maintenance.
The measurement is based on the physical principle of the magneto-dynamic oxygen measuring cell and is
one of the most exact quantitative methods of oxygen determination within the range of 0-100 vol% oxygen.
There is a direct flow against the measuring cell which has got a low volume of only 2 ml (small stagnant
volume). Further characteristics are robustness, extremely small drift, fast response time (T90 < 3 sec.) and
negligible cross sensitivities to other sample gas components.
Fluctuations of the sample gas flow in a range from 10 to 60 Nl/h nitrogen (N2) cause a change of the oxygen
reading which is smaller than 0.1 vol% O2.
Measurements in flue gases and in inerting plants are some typical applications for the PMA 30 within a great
variety of other measurement tasks.

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8TECHNICAL DATA
Oxygen analyzer Series PMAVersion PMA 30/D, PMA 30A/D
Part No. 03A2005
03A2005a
03A2001
03A2005a
PMA 30/D 230 V 50 Hz,
PMA 30/D 115 V 60 Hz,
PMA 30A/D 230 V 50 Hz,
PMA 30A/D 115 V 60 Hz
Power supply 230 V AC (standard) or 115 V AC available (a)*
±15 %, 40-60 Hz, 35.5 VA
Electrical connections Power: 3-pole mains plug with 2 m cable; signals: 9 and 25 pole plug
Measuring ranges Selectable for 0-1, 0-3, 0-10, 0-30 and 0-100 vol% O2, linear
External measuring range indication
One potential free contact for each selected range,
Contact rating max. 48 V DC, 0.2 A
Min. contact load 5 V/1 mA
Remote range control
Remote range control for all 5 ranges by means of external potential free con-
tacts max. 30 V DC 3 mA DC. (requirement: selection switch in position Ext.)
Indication
PMA 30A/D: analogue meter with a scale of 0-30 and 0-100 % for each se-
lected range, digital meter, 4 1/2 digit 9 mm high for 0-100 % O2reading, reso-
lution 0.01 vol% O2
PMA 30/D : digital meter, 4 1/2 digit 18 mm high for 0-100 % O2reading, reso-
lution 0.01 vol% O2
Output signal 0-20/4-20 mA* for the chosen range, non-isolated, max. load 300 Ω
Output voltage max.15 V (delivered condition).
Switchable to a load of max. 900 Ω output voltage max.30 V.
Output current limiting adjustable 20.5 mA – 22 mA. Delivered condition
21 mA. 0-1 V DC, load > 100 kΩ, for the range of 0-100 vol%
Response time for 90% FSD < 3 seconds at 60 Nl/h air
Accuracy after calibration 1 % of the span value of measuring range after calibration or 0.02 % O2 de-
pending on which value is the higher one
Reproducibility deviation Deviation: analogue = < 1% of span/digital = ±0.1 vol% O2
Reproducibility deviation without
changing the measuring range**
Analog output without changing measuring range** = < 0.1 % of measuring
range / digital reading = ± 0.01 vol% O2
Influence of ambient temperature No influence up to 45 °C
Influence of barometric pressure
The oxygen reading varies in direct proportion to changes of the barometric
pressure.
Influence of sample gas flow
Fluctuations of the sample gas flow in a range from 10 to 60 Nl/h nitrogen
(N2) cause a change of the oxygen reading which is smaller than 0.1 vol%
O2
Sample gas inlet pressure
0.01 up to 1 bar g, (PMA 30 required admission pressure for competent flow
rate, no pump inside)
Sample gas outlet pressure Outlet of analyzer must discharge freely into atmosphere.
Flow rate of sample gas Min. 10 to max. 60 Nl/h, adjustable with needle valve on the flowmeter (flow-
meter is calibrated for air and has a measuring range of 7-70 Nl/h)
Temperature of sample gas -10 °C up to +50 °C, dry gas
Analyzer temperature Fixed at +55 °C
Ambient temperature -10 °C up to +45 °C
Storage temperature -20 °C up to +60 °C, relative humidity 0-90% RH
Power supply
Internal power unit for 230 V AC standard or 115 V AC available (a)* 15 %, 40-
60 Hz, 35.5 VA
Electrical connections Mains supply: 3-pole chassis plug with 2 m of cable; signals: 7, 9 and 25-pole
plugs

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Oxygen analyzer Series PMAVersion PMA 30/D, PMA 30A/D
Materials in contact with sample gas Platinum, Glass, PTFE, PVDF, Stainless Steel 316Ti, FKM, Epoxy resin
Sample gas connection 1/8" NPT i
Flow alarm thermo-conductive flow sensor downstream mounted after measuring cell
Status alarm
2 x change over contact, potential free, max. 48 V DC, 0.5 A (min. switching ca-
pacity 50 mW) for flow min-max.-fault, transmitter temperature < 45 °C >60 °C,
light source defective, coupling state, measuring range exceeding, range se-
lection switch defective, power supply error, mains voltage breakdown (12
times internal LED-indication)
Protection / electrical standard IP 20 EN 60529 / EN 61010
Housing / colour 3U/28HP - 19-inch cassette European standard/silver
Dimension / weight Height 3U, width 28HP, length 230 mm + approx. 60 mm installation space /
approx. 2.5 kg
* Please specify with order.
**The minimized error of < 0.1 vol% for the reproducibility deviation can only be selected if the measurement and calibration
ranges are identical. If the instrument is switched to another measuring range, a value of < 1 % of the measuring range is to
be expected.
8.1 OPTIONS
Options
03A9165 Extra charge for PMA 30 as solvent resistant execution with measuring cell type PMC-1LB. Material: O-
rings out of Kalrez.®
02A9005 Extra charge for PMA 20/30 in chlorine resistant execution with a special measuring cell type PMC-
1CL2. All gas bearing tubes PTFE/PVDF equipped with purge gas connectors.
03A9535 Extra charge for electrical zero suppressing with process pressure compensation type SD/PD for
PMA30, pressure range 0.6 bar, media wetted parts: stainless steel, PVDF, FKM. Not with SIL-
certification!
03A9530 Extra charge for process pressure compensation type PD for PMA30, pressure range 0.6 bar, media
wetted parts: stainless steel, PVDF, FKM. Not with SIL-certification!
03A9150 Wall mount housing out of aluminum type 30-19 with 19"-insertion system (3U/42TE), incl. clamp
box, clamp boards and filter, with window. protection class: IP65.
01A9165 Extra charge for changed measuring range to 2.5/5/10/25/100 vol% O2, for recorder outlet and dig-
italmeter (only for PMA30/D).

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9DESCRIPTION
The PMA 30 is a reliable and easy-to-operate instrument. It is built into a compact 19-inch cassette. The
transducer unit maintains a constant operating temperature of 55 °C and a flashing LED on the control panel
indicates the proper operating temperature of the analyzer. The five measuring ranges are displayed on the
analogue meter with 30 and 100 % scale. Two output signals are available. Sample gas connections as well
as connectors for incoming power supply, output signals, remote ranging, remote range indication and status
contact are located at the rear panel of the analyzer. The sample gas enters the analyzer via an external pro-
tective fine filter. The required flow rate can be adjusted at the flowmeter with needle valve, mounted on the
front panel upstream the M&C measuring cell and the flow alarm sensor. The internal tubing is made of PTFE
and PVDF.
Figure 1 Dimensions PMA30

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9.1 FRONT PANEL
1 Analog indication 5 Needle valve 7 - 70 Nl/h
2 Zero potentiometer 6 Measuring range selector switch
3 Span potentiometer 7 LED - heating control
4 Flow meter 8 LED – alarm status
Figure 2 Front panel PMA 30

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9.2 OPTION PROCESS PRESSURE COMPENSATION TYPE PD (WITHOUT SIL CERTIFICATION)
In case of barometric or process originated pressure variations, the PMA 30 can be equipped with a special
pressure compensation. The compensation can be effected within a pressure range of 0.6 – 1.6 bar abs..
Thereby errors in measurement caused by pressure variations can be eliminated.
The pressure compensation can alternatively be switched on or off separately for indications and signal outlet
:
Digital indication via jumper JP1 on the front board (see figure 13 and 14)
0-10 V signal outlet via jumper JP1 on the main board (see figure 12 and page 39)
Analog indication and 20mA current signal via jumper JP2 on the main board (see figure 12 and page
39)
9.3 OPTION ZERO SUPPRESSION WITH PROCESS PRESSURE COMPENSATION TYPE SD/PD
(WITHOUT SIL-CERTIFICATION)
A zero-suppression acting on the measuring range dependent elements analog indication and 20mA current
signal is possible in 1% steps for devices with pressure compensation within a range of 1 % to 97 % O2. The
factory provided adjusted suppression can be assigned to one or more measuring ranges via jumper JP1 on
the extension board (see figure 15 + 16).
A suppression of 97 % via jumper JP1 pos. 3 combined with the 3 % measuring range results in the new
measuring range: 97 %-100 %.
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 meas-
urement 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 dumb-
bell’s movement.
2
4
3
1
GAS INLET
GAS OUTLET

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7 8
5 6
9
Figure 3 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 screwed 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 consist-
ing 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 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.
Every change of the oxygen concentration produces a linear proportional change of the compensation cur-
rent 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 GAS FLOW DIAGRAM OF THE ANALYZER PMA 30
Fine filter Measuring cell
Flow meter with needle valve Flow alarm sensor
Figure 4 Gas flow diagram PMA 30

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The measuring cell 3must absolutely be protected against dust particles. Therefore, the preceding external
gas conditioning system should be equipped with a fine filter 1of at least 2 micron filter porosity (eg. type
FP-2T).
The maximum gas flow of 60 Nl/h is adjusted via flow meter 2 with needle valve on the front plate.
A flow sensor 4in the outlet of the measuring cell is controlling the gas flow through the cell according to
the measuring principle of thermal conductivity. In case the minimum gas flow is decreased, an alarm is au-
tomatically given and is available as status message on the the collective status output. Furthermore, an
alarm state is shown by a colour change of the LED 8(see figure 2) on the front plate of the analyzer
(red/green).
12 RECEIPT OF GOODS AND STORAGE
The analyzer PMA 30 is a completely pre-installed unit.
Please take the analyzer and possible special accessories carefully out of the packaging material immedi-
ately 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 PMA 30 must be stored in a weather-protected and
frost-proof area!

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13 INSTALLATION
The PMA 30 is intended for stationary operation. In combination with a gas conditioning according to the
requirements a long-lasting operability and a minimum of maintenance is guaranteed.
CAUTION!
The sample gas must be dust free and dry to prevent a contamination
and condensation in the analyzer.
Basically, always connect a fine filter (e.g. type FP-2T, Part No. 01F1200)
upstream.
CAUTION!
In case of outdoor operation protect the analyzer against sun, wind and
rain.
At the installation location constant climatic ambient conditions (pres-
sure, temperature) are necessary to prevent a distortion of the measure-
ment and a condensation in the measuring cell in case the ambient tem-
perature is falling below the dew point temperature of the sample gas.
A vibration-free location is ideal for mounting; if this is not possible, ap-
propriate measures must be taken. The analyzer must not be installed
in direct proximity of heat sources.
The position of operation is not necessarily horizontal.
DANGER!
The analyzer is allowed to be operated only in non-hazardous areas and
with non-ignitable gases and gas mixtures.
The analyzer is designed for 19“-rack mounting. It has to be fixed at the 4 exterior holes in the front panel
with adequate screws.
NOTE!
Leave enough space at the back side of the analyzer for unrestricted electrical
and pneumatic connections.
13.1 CONNECTION OF SAMPLE GAS INLET AND SAMPLE GAS OUTLET
The sample gas inlet and outlet are placed at the back side of the analyzer and have a 1/8” NPT i thread. Screw
in here adequate tube connectors e.g. 1/8” NPT o – DN4/6 PVDF (Part No. 05V2045).
Connect the sample gas inlet with a corresponding gas conditioning with e.g. a PTFE hose DN4/6.
ATTENTION Sample gas has to discharge freely to atmosphere at the sample outlet because be-
cause an increase of pressure will distort the oxygen indication.
Do not bend the connection hoses.

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13.2 STANDARD GAS CONDITIONING SYSTEM
7


+5°C

PMA 30


Figure 5 Standard gas conditioning system
1: Heated gas sample probe (e.g. probe SP2000-H)
2: Heated gas sample line (e.g. 4M4/6)
3: Sample gas cooler (e.g. ECM-1G)
4: Peristaltic pump or condensate collecting vessel (e.g. SR25.1 or TG-1)
5: Diaphragm pump (e.g. N3)
6: Fine filter (FP-2T)
7: Bypass (e.g. FM40/250)
13.3 ELECTRICAL CONNECTION
CAUTION!
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!
A mains connector plug is located at the back side of the analyzer housing. In the scale of delivery a 2 m
connection cable with mains connector and earthing type plug is included.

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1 = Gas IN 1/8“ NPTi 5/6 = Mains fuses (L and N)
2 = Option purge gas connection 4/6 7 = Mains IN / connector plug
3 = Gas OUT 1/8“ NPTi 8 = D-Sub-connector 25-pole for remote control
4 = D-Sub-connector 9-pole for signal outlet and indication
Figure 6 Back side PMA 30
13.3.1 ANALOG SIGNAL OUTPUT
The PMA 30 has two analog signal outputs as standard. A current signal optionally 0 or 4-20 mA and a voltage
signal 0-10 V, both indicate up to 10 % above the corresponding measuring range.
These analog signals contain initially no status signals.
NOTE!
By series connection of status contact and 4-20mA outlet failure information can
be integrated.

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13.3.2 DESCRIPTION 0/4-20MA OUTLET
Every measuring range meets 0/4-20 mA (standard measuring ranges: 0-1 %; 0-3 %; 0-10 %; 0-30 %;
0-100 % O2)
Current range switchable (see 13.3.3; 4-20 mA standard factory setting)
Galvanically isolated (internal power supply)
For a max. load of 300 Ω in standard factory setting (max. 7 V); switchable to a max. load of 900Ω (max.
22 V)
A max. limit of 20.5–23 mA is adjustable (see 13.3.5; 21 mA standard factory setting)
A min. limit for 0-20 mA is at 0 mA resp. for 4-20 mA at 2.9 mA
Linear range from 0 to 22 mA resp. 3.2 to 22 mA
General evaluation of the 0-20 mA signal:
General evaluation of the the 4-20 mA signal:
If the oxygen measurement is used as a safety function according to SIL the 4-20mA signal has to be evaluated
as follows:
Current limiting occurs here when the current is ≥ 21mA.
13.3.3 ADJUSTMENT OF THE CURRENT SIGNAL OUTLET
The range of the mA current signal can be switched via jumper JP13 and JP15 on the main board.
0-20 mA: JP13, JP15 in position 2-3; 4-20 mA: JP13, JP15 in position 1-2 (see figure 12).
13.3.4 ADJUSTMENT OF THE LOAD
Via jumper JP9 on the main board the load will be adjusted.
Max. 300 Ω: position 1-2 (standard); max. 900 Ω: position 2-3 (see figure 12).
13.3.5 ADJUSTMENT OF THE MAX. CURRENT SIGNAL AT THE MA-OUTLET
For adjustment of the max. output current:
E.g. introduce air into the analyzer (20.9 % O2) and switch to the 10%-measuring range This way you
get the max. output signal.
Measure current at D-sub-connector X4, pin 1 and 2
Adjust desired max. current at potentiometer P1 on main board (see figure 12)
Measuring Range Measuring Range
exceedance
Measuring Range
Measuring Range
Measuring Range
Lower deviation
Measuring Range
exceedance
Measuring Range
exceedance
Measuring Range
Lower deviation

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13.3.6 DESCRIPTION 0-10 V OUTLET
0-10 V always correspond to 100 % O2independent of the measuring range
For a load of > 100 KOhm
Linear from -0.5 V to 11 V
General evaluation of the 0-10 V signal:
The connection happens at the 9-pole D-sub-connector X4. (see figure 6 and 7)
13.3.7 STATUS SIGNAL
The status signal contains a collective fault message:
Power supply error, voltage breakdown
Flow min. fault
Flow max. fault (can be switched off: JP3)
Light source short circuit/line breakage
Selection switch defective
Transmitter temperature < 45 °C/> 60 °C (can be switched off: JP8/JP7, 2+3 on, 1+2 off)
Coupling state (can be switched off: JP6, 2+3 off, 1+2 on)
Fault High/Fault Low (connectible: JP14/JP12). Measuring range lower deviation and exceedance
more than +3.125 % resp. -4.375 %, (corresponds to > 20.5 mA resp. < 3.2 mA)
An allocation of the existing failures is possible via 12 internal LED’s on the main board (see figure 12). The board
becomes visible after removing the cover plate. To do this remove the two screws in the lid.
The status signal is accessible via a potential free switching contact (status contact) as well at X1 (D-sub 25-
pole) as also at X4 (D-sub 9-pole) (see figure 6 and 7).
Figure 7 Pin assignment of D-sub-connector X4
Measuring Range
Lower deviation Measuring Range Measuring Range
exceedance