mru OPTIMA7 biogas User manual

4102EN-BIO
OPTIMA7 biogas
USER MANUAL

USER MANUAL OPTIMA7 Biogas
MRU GmbH, D-74172 Neckarsulm 2 / 78
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Original user manual
© 2021 by MRU
No part of this manual my be published in any form (print, fotocopy,
electronic media or any other publication form) without a written
approval by the publisher.
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not marked as such, are properties of the respective owners.
Edition: 2021-04-19,V1.30.EN

USER MANUAL OPTIMA 7 Biogas
MRU GmbH, D-74172 Neckarsulm 3 / 78
Table of content
1Information for product and safety .............................. 6
1.1. Safety manual .................................................................................................6
1.2. Safety precautions.........................................................................................6
1.3. Ensure safety ...................................................................................................7
1.4. Important general information EN50379 and VDI4206 ..................7
1.5. User guidelines for rechargeable batteries..........................................9
2Introduction................................................................... 10
2.1. Intended use ................................................................................................ 10
2.2. About us ........................................................................................................ 12
2.3. Packaging...................................................................................................... 13
2.4. Return of hazardous materials .............................................................. 13
2.5. Return of electronic equipment............................................................ 13
3Description..................................................................... 14
3.1. Gas flow diagram........................................................................................ 14
3.2. Analyzer ......................................................................................................... 15
3.3. Condensate separator .............................................................................. 16
3.4. Probes............................................................................................................. 17
4Operating....................................................................... 18
4.1. Display............................................................................................................ 18
4.2. Keypad............................................................................................................ 19
4.3. Menu structure............................................................................................ 20
5First usage...................................................................... 21
5.1. Preparatory steps ....................................................................................... 21
5.2. Analyzer settings ........................................................................................ 21
5.3. Setting measurement................................................................................ 22
5.4. Switch-ON protection............................................................................... 22
5.5. Setting printer type and print out........................................................ 23
5.6. Setting Bluetooth parameters................................................................ 24
5.7. Setting date and time ............................................................................... 25
5.8. Configuring measurement programs ................................................. 25
Setting CO limit value (only gas flue measurement)............................. 26
Configuration of the measurement window (display content) –only
Biogas measurement ........................................................................................ 26
Configuration of the measurement window (display content) –only
Flue gas measurement ..................................................................................... 27
Configuring zoom window ............................................................................. 28
6Preparing measurement ............................................... 29
6.1. Ensure power supply................................................................................. 29
6.2. Automatic Auto-off function.................................................................. 29

USER MANUAL OPTIMA7 Biogas
MRU GmbH, D-74172 Neckarsulm 4 / 78
6.3. Measuring with grid power supply / Battery charging.................29
6.4. Battery charge condition .........................................................................29
6.5. Operating temperature ............................................................................ 30
6.6. Controlling Condensate separator (water trap)...............................30
6.7. Connections and tightness .....................................................................31
6.8. Automatic zero-pint setting ...................................................................31
6.9. Repeating the zeroing ..............................................................................32
7Performing measurement.............................................33
7.1. Selecting the measuring program........................................................33
7.2. Performing Biogas measurement.........................................................34
7.3. Flue gas measurement (option) ............................................................34
7.4. Setting CO-limit value (only with flue gas measurement)...........35
7.5. Storing measured values .........................................................................35
7.6. Printing measurement values.................................................................36
7.7. Terminate measurement..........................................................................37
7.8. Last measurement values ........................................................................37
7.9. Pressure measurement (option)............................................................38
7.10. Differential temperature measurement (option).............................39
7.11. Gas flow measurement (option)............................................................ 40
8Data Storage...................................................................44
8.1. Organizing data storage ..........................................................................44
8.2. Calling up information about data storage ......................................45
8.3. Site administration .....................................................................................45
Create new site....................................................................................................46
View sites............................................................................................................... 46
View sites............................................................................................................... 47
Searching site.......................................................................................................47
Changing sites.....................................................................................................48
Deleting sites .......................................................................................................49
8.4. Data transfer using SD card....................................................................50
Importing sites ....................................................................................................50
Exporting sites .....................................................................................................52
Exporting combustion measurements........................................................53
Exporting differential pressure measurements. ...............................53
8.5. Measurement in Data storage ...............................................................54
Viewing measurements....................................................................................54
Deleting measurements...................................................................................55
Transferring measurements to SD-Card (Option) ..................................56
9Extras / Adjustments .....................................................57
9.1. Service calibration menu..........................................................................57
9.2. Default settings ...........................................................................................58

USER MANUAL OPTIMA 7 Biogas
MRU GmbH, D-74172 Neckarsulm 5 / 78
9.3. Service values............................................................................................... 59
9.4. Leak proof test............................................................................................. 60
9.5. Contents SD card........................................................................................ 61
9.6. Contents Analyzer information ............................................................. 62
10 Maintenance and care................................................... 63
10.1. Maintenance................................................................................................. 63
10.2. Service messages........................................................................................ 63
11 Appendix........................................................................ 64
11.1. Technical data.............................................................................................. 64
General data......................................................................................................... 64
Measured values................................................................................................. 64
11.2. Analysis and calculations......................................................................... 68
11.3. Text input ...................................................................................................... 71
11.4. Asking user for decision........................................................................... 71
11.5. Firmware update......................................................................................... 72
Install the new software version in the analyser ..................................... 72
Performing and checking the update......................................................... 72
In case of error .................................................................................................... 73
11.6. Troubleshooting ......................................................................................... 75
Troubleshooting the analyser........................................................................ 75
Troubleshooting condensate separator..................................................... 76
12 Declaration of conformity............................................ 77

USER MANUAL OPTIMA7 Biogas
MRU GmbH, D-74172 Neckarsulm 6 / 78
1Information for product and safety
1.1. Safety manual
All general information and safety precautions of MRU products are
listed in the supplied separate safety manual.
Therefore, this manual must be read and observed before the first use
of the instrument.
Instrument-specific safety and warning requirements in this manual are
prefixed before dangerous actions.
1.2. Safety precautions
The used categories of safety precautions are here explained once more
DANGER
Identifies an immediate, impending hazard that, if
ignored, will result in severe bodily injuries or death.
WARNING
Identifies an immediate, impending hazard that, if
ignored, may result in severe bodily injuries, material
damage or death.
CAUTION
Identifies a possibly dangerous situation that, if
ignored, may result in minor injuries.
ATTENTION
Identifies a possibly harmful situation that, if ignored,
may result in damages to the device or its
surroundings.
NOTE
Identifies user tips and other especially important infor-
mation.
The explanation of safety notices:
CAUTION
HOT –danger of burns and fire hazards from gas
extraction probe.
Physical harm and property damage can be caused.
►Cool down the probe tube.

USER MANUAL OPTIMA 7 Biogas
MRU GmbH, D-74172 Neckarsulm 7 / 78
1.3. Ensure safety
►Please read the user manual completely before the first use.
►Only use the analyser for the intended use and within the parameters
specified in the technical data.
►Do not use any violence.
►Avoid falls.
►Do not put the analyser into use, if the housing, power supply unit or
supply leads are damaged.
►Do not store the analyser together with solvents. Do not use
desiccants.
►Only carry out maintenance and service work on this analyser as de-
scribed in the User Manual. Observe the prescribed action steps.
►Operate the analyser only in closed, dry rooms and protect it from
rain and moisture.
►When operating the analyser on mains power, operate it only with
the mains adapter supplied.
►Do not use the metal tube of the gas sampling probe or other metal-
lic parts / accessories as electrical conductors.
►The analyser must not be located in the immediate vicinity of open
fire or great heat.
►The specified temperature range of the gas sampling probe must not
be exceeded, otherwise the probe tube and temperature sensor will
be destroyed.
1.4. Important general information EN50379 and VDI4206
This analyser is not designed to be used for continuous measurements.
Before using the analyser verify the condition of the various parts of the
analyser, such as the probe, the ambient air conditions, the condensate
separator, star filter and the connectors for damage and/or blockages.
When starting up the analyser it will take between 1 –3 minutes to set to
zero depending on the condition of the sensors and of ambient.
The minimum zeroing time of the analyser to achieve correct measure-
ment values can be expected by 1.5 minutes.
Exposure to acids; aggressive gases such as sulphur; vapours such as
thinners, gasoline, alcohol and paint, etc. can damage, reduce the life of,
or destroy the sensors.
The life of the sensors depends on how they are used, maintained and
treated. Typical average life expectations are: O2- 3 years; CO - 2 - 3 years,
H2S 2 years and NO - 3 years.
The use of the analyser for regulatory purposes is subject to special reg-
ulations (for example a periodical examination of the analyser). Please
obtain the appropriate regulations from your local responsible authority.

USER MANUAL OPTIMA7 Biogas
MRU GmbH, D-74172 Neckarsulm 8 / 78
Biogas or other similar gases (landfill gas, bio-methane, coal seam gas
etc) is containing flammable component CH4 and toxic component as
well (H2S and CO2).
Analysers sample a certain volume of the biogas, and vent it to the am-
bient air.
For this reason, there are two aspects which must be considered:
1) toxicity danger of sample gas
2) flammable (explosion) danger of sample gas
1) Inhaling toxic gases is harmful to health and can even cause death in
some cases.
•It is the responsibility of analyser user to ensure that person is skilled
and trained in safety aspects of gases being analysed and procedures
to follow while using this instrument.
•Local regulations for possible exposition to toxic gases have to be
known by the user and obeyed by the user of the analyser
•Using a personal gas detector inside the biogas plant is highly rec-
ommended since H2S in higher (very dangerous concentration) can-
not be detected by human nose. Only small concentrations around
few ppm can be detected by human nose
•CO2 gas is heavier than air and therefore operator shall avoid using
portable biogas analyser at underground levels. Beside of that CO2 is
also odourless!
•It is not allowed using the portable biogas analyser in confined space
or rooms without sufficient ventilation.
•Sample gas exiting the analyser will flow in the ambient air and only
outdoor use or forced ventilation rooms are suitable for using the
portable biogas analyser
2) Regarding flammable gases (e.g. CH4methane) and hazardous area
of operating the instruments, user must also be able to recognize the
area classification and be aware of using the instrument there. This area
classification is country specific, please observe and notice it.
•MRU instruments may be operated in hazardous areas zone 2 by
skilled users obeying local guidelines e.g. by using LEL gas detectors

USER MANUAL OPTIMA 7 Biogas
MRU GmbH, D-74172 Neckarsulm 9 / 78
1.5. User guidelines for rechargeable batteries
NOTE
The rechargeable batterie is installed inside the ana-
lyser and is not accessible to the end customer. How-
ever, the following instructions must generally be ob-
served when handling lithium-ion rechargeable batter-
ies.
•This rechargeable battery can only be used in this analyser.
•Do not throw the rechargeable battery into a fire, charge it at high
temperatures and store it in a hot environment.
•Do not deform, short-circuit or modify the rechargeable battery.
•The rechargeable battery must not be used in or under water.
•Do not expose the rechargeable battery to strong mechanical forces
and do not throw it.
•Do not cut or squeeze the connecting cables of the rechargeable bat-
tery.
•Do not connect the (+) contact to the (-) contact or metal.
•Non-observance of the above guidelines can cause heat, fire and ex-
plosions

USER MANUAL OPTIMA7 Biogas
MRU GmbH, D-74172 Neckarsulm 10 / 78
2Introduction
•This manual enables you to understand and safely operate this MRU
Analyzer.
•Please read this manual with great vigilant and get familiar with the
product before using it.
•This analyser may only be operated by competent personnel and for
its intended use.
•Please pay special attention to all safety directions and warnings to
prevent personal injuries and damaging of the product.
•We can’t be held responsible for any injuries and/or damages that
occur by not following the instructions in this manual.
•Always keep the manual near you when working with the analyser,
to be able to read instructions as needed. Please ensure to hand
over all documents to when handing the analyser over to others.
2.1. Intended use
The OPTIMA 7 BIOGAS analyser is used for:
•for BIOGAS simultaneous measurements of O2, CH4, CO2, H2S and
optional the BIOGAS pressure
•optional for combustion measurements of the engine: O2, CO, NO,
NO2and CO2(NDIR) including the calculation of: mg/m3, NOx as
mg/m3 NO2, true NOx-measurement NOx = NO + NO2, referencing
(normalisation) to user settable value
It can also be used (when options are activated or external equipment is
used) for a number of measurement tasks, such as:
•Flow velocity measurement
•Differential measurement of pressure and temperature
•Combustibles detection with external HC sensor
•Automatic measurement with data logging
You will find a list of all options for this analyser on our web page or
you can contact MRU or our local representative. The OPTIMA 7 BIOGAS
Analyzer is available in different versions. This manual will describe all
versions indicating options and features not always available on all ver-
sions.