GEIT GAS 3200 BIOGAS Series User manual

G.E.I.T. Europe bvba, Walmersumstraat 8, B-3380 Bunsbeek, Belgium
Tel: [phone] - Fax: [phone] - Email: s[email protected] –www.geiteurope.com
OPERATION MANUAL
GAS 3200 BIOGAS Portable Analyser
Issue EN2014v0

Portable Biogas analyser series GAS 3200 BIOGAS
Operation manual –Issue EN2014V0
Page 2of 45
INDEX
Chapters
Titles
Pages
1
Limited Warranty & Limitation of Liability
4
2
Foreword
5-6
2.1
Overview
5
2.2
Unpacking instructions
5
2.3
Reporting damage
5
2.4
Before using the analyser
5-6
3
Safety Information
7-8
3.1
Safety information for Analyser Utilisation
7
3.2
Gas connections and sample gas conditions
7
3.3
Notice for electrical connections
7-8
3.4
Notice for analyser application
8
3.5
Notice for maintenance
8
4
Measurement technologies
9-10
4.1
DUAL BEAM NDIR DETECTORS for CH4 and CO2
9
4.2
ECD (Electrochemical) sensors for O2 and H2S
9
4.2.1
Oxygen measurement with Galvanic Fuel Cell
9
4.2.2
H2S measurement with 3-electrodes Electrochemical Cell
10
4.3
N2 calculation
10
4.4
Temperature measure
10
5
Portable Gas 3200 Biogas Analyser
11-18
5.1
Technical specifications
12
5.2
Front panel
13
5.3
Gas connection interfaces
13
5.4
battery
14
5.5
Internal views
14-16
5.6
Gas sampling pump
16
5.7
Sample gas conditions at gas analyser inlet
17
5.8
Environmental conditions
17
5.9
Electric connections
18
5.9.1
AC/DC adapter
18
5.9.2
RS232 output interface
18
5.10
Preparation
18

Portable Biogas analyser series GAS 3200 BIOGAS
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Chapters
Titles
Pages
6
OPERATION
19-40
6.1
Warm up
19
6.2
Measurement screen
20
6.3
Auto-Zero function
20-21
6.4
Pump activation
21
6.5
Information screen
21
6.6
Switch OFF function
22
6.7
Record function
23-24
6.8
Configuration of the analyser
25
6.8.1
Access to the Set up menu
25
6.8.2
Parameter
26
6.8.2.1
Backlight
26
6.8.2.2
Password change
27-28
6.8.2.3
Language selection
29
6.8.2.4
Time and date adjustment
30
6.8.2.5
Display of negative values
30-31
6.8.2.6
Selection of H2S sensor
31-32
6.8.3
Memory
32
6.8.3.1
Browse memory
33-34
6.8.3.2
Delete all recorded data
34
6.8.3.3
Set logging interval
35
6.8.4
Gas calibration
36
6.8.4.1
About gas calibration
36
6.8.4.2
Zero calibration
36-37
6.8.4.3
Span calibration
37-38
6.8.5
Diagnosis
39
7
Maintenance
40-42
7.1
Warning
40
7.2
Zero and Span calibration
41
7.3
Annual maintenance
41-42
8
Trouble Shooting
43-44
9
Text properties
45
10
Personal notes
45

Portable Biogas analyser series GAS 3200 BIOGAS
Operation manual –Issue EN2014V0
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1. Limited Warranty & Limitation of Liability
Gas Engineering and Instrumentation Technologies Europe (G.E.I.T. EUROPE) warrants this product to be free from defects in
material and workmanship under normal operation, maintenance and beginning on the date of shipment to the buyer, for a period
of 1 year.
Spare parts, repair and/or maintenance works performed by G.E.I.T. EUROPE are covered by a 30 days warranty.
This warranty extends only to the sale of new and unused products to the original buyer. The warranty obligation is limited, at
G.E.I.T. EUROPE option, to refund of the purchase price, repair, or replacement of a defective product that is returned to an
authorized Reseller within the warranty period. This guarantee, whereas applicable, is for material exclusively returned by an
authorized Reseller to G.E.I.T. EUROPE and delivered back to the Reseller ex works Belgium. In no event shall G.E.I.T. EUROPE liability
hereunder exceed the purchase price actually paid by the buyer for the Product.
This warranty does not include:
a) Fuses, filters and disposable batteries or the routine replacement of parts due to the normal wear and tear of the product arising
from use;
b) Any product which in G.E.I.T. EUROPE opinion, has been misused, altered, neglected or damaged by accident or abnormal
conditions of operation, handling or use;
c) Any damage or defects attributable to repair of the product by any person other than an authorized dealer, or the installation of
unapproved parts on the product;
The obligations set forth in this warranty are conditional on:
a) Proper storage, installation, calibration, use, maintenance and compliance with the product manual instructions and any other
applicable recommendations of G.E.I.T. EUROPE;
b) The buyer promptly notifying G.E.I.T. EUROPE of any defect and, if required, promptly making the product available for
correction. No goods shall be returned to G.E.I.T. EUROPE until receipt by the buyer of shipping instructions from the
manufacturer.
c) The right of G.E.I.T. EUROPE to require that the buyer provide proof of purchase such as the original invoice, bill of sale or
packing slip to establish that the product is within the warranty period.
The buyer agrees that this warranty is the buyer’s sole and exclusive remedy and is in lieu of all other warranties, express or implied,
including but not limited to any implied warranty of merchantability or fitness for a particular purpose. G.E.I.T. EUROPE shall not be
liable for any special, indirect, incidental or consequential damages or losses, including loss of data, whether arising from breach of
warranty or based on contract, tort, or reliance or any other theory.
Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or limitation of incidental or
consequential damages, the limitations and exclusions of this warranty may not apply to every buyer. If any provision of this
warranty is held invalid or unenforceable by a court of competent jurisdiction, such holding will not affect the validity or
enforceability of any other provision.
Representations and warranties made by any person, including dealers and representatives of G.E.I.T. EUROPE, which are
inconsistent, or in conflict with the terms of this warranty, shall not be binding upon G.E.I.T. EUROPE unless reduced to writing and
approved by an expressly authorized officer of G.E.I.T. EUROPE
Controversies: in case of controversy, Belgian Law & Leuven Court is applicable.

Portable Biogas analyser series GAS 3200 BIOGAS
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2. Foreword
2.1 Overview
Before using the analyser and its accessories, please familiarize you with its operation by reading this manual. If you have any
questions, please do not hesitate to call your authorized reseller for assistance.
2.2 Unpacking Instructions
The gas analyser is a fragile instrument, please unpack it with care
-Inspect the shipping boxes for any sign of damage. Damaged shipping boxes increase the risk to find damaged material too.
-Remove the accessories as power cable and rack mounting lugs from the shipping box.
-Carefully remove the analyser from its shipping box together with its protections.
-Remove the protections and place the material on a flat surface in a clean and dry location.
-Inspect the material for any sign of damage.
Note: keep the shipping box and the protective packaging for eventual future shipping needs.
2.3 Reporting Damage
If there are any apparent damages to the outside of the instrument due to shipping or handling, file a damage claim and notif y the
forwarder immediately. The shipping container or packing materials should be retained for inspection by the forwarder.
2.4 Before using the analyser
The use of the GAS 3200 Biogas portable analyser requires a full understanding of the analyser operation. Use the analyser only
as specified in this manual, otherwise its good operation and initial performances may be impaired.
Authorized service representatives and original parts must only be employed in carrying out repairs to the analyser in order to
maintain the validity of the warranty. Modification of components, use of non-original parts, or use of incomplete or used parts will
also invalidate the warranty.
Make sure there is no obstruction at the sample inlet before you operate the analyser.
The sample gas must be free from particles (< 1µ), oil traces and its moisture content (Relative Humidity) must be between 5 and
95% non-condensing.
Do not use the analyser if it is damaged. Before you use it, inspect the case. Look for cracks or missing metal parts. If the analyser
is damaged or something is missing, contact G.E.I.T. EUROPE or preferably your authorized reseller immediately.
Use only original parts that have been specifically designed for your GAS 3200 BIOGAS analyser. The use of other parts than
original ones may modify the performances of your analyser.
The analyser is delivered already calibrated in factory; G.E.I.T. EUROPE recommends however to perform a calibration at least
each 3 months using certified calibration gases.
Do not expose the analyser to electrical shock and/or severe continuous mechanical shock.
Do not attempt to disassemble, adjust, or service the analyser unless instructions for that procedure are contained in the manual
and/or that part is listed as a replacement part.
Do not allow liquids to condense or use high power sprays on the instrument.

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The warranty will be voided if customer personnel or third parties damage the analyser during repair attempts.
Non-authorized repair/service attempts void this warranty.
Important
The warranty and/or certification of the analyser will be voided:
* If customer personnel or third parties damage the analyser during repair attempts.
* For any repair/service attempt executed by non-authorized and/or non-qualified people.
* For any use of non-original, incomplete or wear pieces during repair or maintenance services.
* For any use that does not answer to the specifications and operation limits as defined in this manual.

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3Safety Information
All along this manual safety marks have been added in order to catch user attention about potential risks for both human safety and
analyser operation. Please read and follow these carefully.
Safety marks are identified as follows:
Safety mark
Brief Description
Additional Instruction
Dangerous
May cause serious human injuries
Caution
May cause moderate human injuries or may destroy the analyser
Electric Shock
May cause human injuries and/or may damage the analyser.
Forbidden
Not allowed in normal operation
3.1 Safety information for Analyser utilisation
GAS 3200 BIOGAS portable analyser is not designed for use in hazardous area. Never use the analyser
in an EX environment with potential gas explosion risks.
Human safety could be seriously endangered by flame, fire and/or deflagration.
GAS 3200 BIOGAS portable analysers must be installed on a flat surface. Avoid locations where the
analyser can be exposed to vibrations, chocks or intense electromagnetic fields as this can have a
negative effect on the performances of the analyser.
Always respect the operation limitations of the analyser.
Do not expose the analyser to strong artificial light or sun radiations, wind, moisture of rain.
Prevent dust and moisture to enter the analyser otherwise its good operation will be impaired.
3.2 Gas connections and sample gas conditions
Before switching ON the analyser always check the gas inlet and outlet tubing are correctly connected
to the respective ports of the analyser.
Sample gas pressure must be within the specification range in order to avoid gas leak due to excessive
pressure or wrong operation of the gas analyser. A leakage of toxic or explosive gas can lead to
serious accident.
Always connect the gas exhaust tubing to the GAS OUT port of the analyser in order to exhaust the
sample gas after analysis directly to the atmosphere outside of the building or away from the working
place. Indoor venting of the sample gas is not allowed.
After switching ON the analyser, wait till the complete warm-up time is over.
Sample gas conditions at GAS IN port of the analyser must answer to the following specifications:
-Dew point: min. 5°C below the lowest ambient T° where the analyser will be used.
-Moisture: gas must be dry.
-Quality: free from solid particles and oil traces

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-Temperature: < 50°C
-Pressure in: ± 50 mbar relative;
Processes with lower gas pressure will require the use of a gas sampling pump.
Processes with higher gas pressure will requires the installation of a pressure reducer before the
analyser to keep the gas pressure constant and limited to max. 30 mbar relative.
Gas pressure > 500 mbar relative will cause permanent damages.
-Pressure out : atmospheric pressure; If the gas is returned to the process were the pressure is
higher than the atmospheric pressure, a back pressure regulator will be required (available as an
option)
Environmental conditions:
-temperature: +5° to +45°C
-pressure in: atmospheric pressure +/- 10%
-Relative humidity: maximum 0-95%, not condensing.
3.3 Notice for electrical connections
Please use the power supply that complies with the power ratings of the analyser, to avoid fire and/or
abnormal operation.
The analyser is intended to be used with its internal batteries offering an operating autonomy > 4h.
Ensure the power supply is switched OFF before connecting a data transmission line to the serial
RS232 port
Never use the analyser in an EX environment with potential gas explosion risks.
3.4 Notice for analyser application
Smoking nearby to the analyser is not allowed and could lead to serious fire hazards.
Test the gas analyser response exclusively on target gases with certified gas canisters from known
concentration. Span gas concentration need to be within 90% to 100% of the designed full scale
range, otherwise the accuracy and linearity of the analyser can be affected. Use pure nitrogen N2 5.0
quality for zero calibration.
Never let the moisture enter the analyser to avoid electric discharge and risk of short circuit.
Always prevent dust, tar and oil traces for entering the analyser to avoid damages to the measuring
cells.
Never switch OFF & ON successively the analyser power supply without reasons, otherwise the
analyser lifetime might be shortened, or the analyser might be damaged.
3.5 Notice for maintenance
Always shut off the power supply before servicing the analyser to prevent from electric shocks.
In order to operate correctly, the analyser must be maintained timely, at least once a year. Please
consult your authorized reseller.
Always switch off the power supply, protect and store carefully the analyser if it will not be used for a
long period of time.

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4Measurement technologies
4.1 Dual beam NDIR detectors for CH4and CO2
NDIR operates on the fundamental principle that mostly all gases absorb light. The absorption occurs at specific wavelengths that
are determined by the molecular structure of the gas, and this absorption is directly proportional to the amount of gas present in
the sample. Many factors affect absorption, but only gas concentration is desired. The other factors are changes in temperature,
atmospheric pressure, back-ground gas concentrations, optical path clarity and detector’s drift. The key to reliable NDIR is “Signal
to Noise Ratio” (SNR), and this is the toughest part of NDIR. The higher the ratio of absorption caused only by the gas of interest to
the absorption from all other sources and electronic noise, the higher the quality of the result.
The proprietary Dual-Beam single-path bench adopts a “reference” wavelength that is not absorbed by the gas of interest and is
subtracted from the target gas signal. This provides a “common mode” noise rejection and allows for improved temperature and
pressure compensation as well as some compensation for electronic drift. Thanks to the “common mode” noise rejection, this
bench provides a zero and span drift.
4.2 ECD (electrochemical) sensor for O2and H2S
4.2.1 Oxygen measurement with Galvanic Fuel Cell
A galvanic fuel cell is used to determine the % level of oxygen contained in the sample gas.
The fuel cell contains a cathode, anode, and an electrolyte. A permeable membrane holds the electrolyte in the cell. The sample
flows over the membrane and oxygen diffuses in to the fuel cell where it reacts with the electrolyte. This reaction produces an
electrical current, which is directly proportional to the concentration of oxygen in the gaseous mixture surrounding the cell. The
current output is linear with an absolute zero. In the absence of oxygen, the fuel cell produces no current.
Galvanic Fuel Cell features are:
Low cost in comparison with the paramagnetic detector
Compact
Reliable and very accurate
Fast response T90 (< 5 Sec)
No interferences from background gases as 100% vol CH4, CO2, CO and C3H8 and 2000 ppm H2S
No maintenance
> 3 years expected lifetime in ambient air
Immunity to vibrations
No warm-up time needed

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4.2.2 H2S measurement with 3-electrodes Electrochemical Cell
The 3-electrodes substance-specific electrochemical H2S sensor used in the GAS 3200 Biogas analyser has been designed for biogas
applications with high H2S concentrations in continuous mode and offers the following key features:
The working electrode (also called the sensing electrode) is
designed to optimize the oxidation or reduction of the toxic gas to
be measured. This electrode allows the gas to come in contact
with both electro-catalyst and electrolyte to create a three-phase
interface of gas, liquid and solid. The other two electrodes in the
cell, the counter electrode and the reference electrode usually
have a similar chemical composition to the working electrode.
The cell electrolyte provides ionic electrical contact between the
electrodes.
The working electrode is the surface where the electrochemical oxidation (H2S) occurs. A high surface area catalyst is used to
optimize the sensor performance, resulting in a high sensor capacitance leading to susceptibility to electromagnetic interference.
This electrode is exposed to the outside air and hence is directly exposed to all gases in the air including the gas to be measured.
Therefore this electrode may be poisoned if exposed to certain gases that either adsorbs onto the catalyst (e.g. acetylene onto CO
sensors), or react, creating by-products which inhibit the catalyst (e.g. NO2or aromatics onto H2S sensors). This is the same problem
as poisoning in fuel cells and car catalytic converters.
The counter electrode balances the reaction of the working electrode –if the working electrode oxidizes the gas, then the counter
electrode must reduce some other molecule, generally O2, to generate an equivalent current, in the opposite sense.
The reference electrode anchors the working electrode potential to ensure that it is always working in the correct region of the
current-voltage curve –see figure 2 below. It is important that the reference electrode has a stable potential, keeping the working
electrode at the right electrochemical potential to maintain a constant sensitivity, good linearity and minimum sensitivity to
interfering gases. The potentiostat circuit ensures that the counter electrode is provided with as much current as it needs, also
maintaining the working electrode at a fixed potential, irrespective of how hard it is working.
Technical specifications of H2S sensor
Low cost
Compact
Several measuring range are available: 50/200/500ppm/1000/2000/5000 or 9999 ppm
Reliable measure with < ±3% FS accuracy
Fast response time T90 (< 30 Sec)
No interference from CO2and CH4
No maintenance
1 year expected lifetime when discontinuously exposed to H2S
Immunity to vibrations
No warm-up time
4.3 N2calculation (option)
N2value is an optional parameter on GAS 3240 BIOGAS analyser and is obtained by calculation according to the formula:
% N2= 100% - (%CH4+ %CO2+ %O2+ %H2S)
4.4 Temperature measure
The analyser is delivered with a PT100 temperature probe for the measure of ambient or biogas temperature in the range of -10°C
to +110°C

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5Portable GAS 3200 BIOGAS analyser
5.1 Technical specifications

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5.2 Front panel
1- Power on/off 2 LCD screen –3 –selection touch 4 –ESC (Escape) touch 5 –ENT (Enter) touch 6 - Plug for AC/DC battery
charger 7 - RS232 serial COM port
5.3 Gas connections Interfaces
8 –coalescing/dust filter
9 –flowmeter 0-1.5 L/min
10 –connector for external ambient temperature probe
11 –plug-in type male connector for gas inlet tubing
12 –plug-in type male connector for gas outlet tubing
5

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5.4 Battery
The battery is accessible without opening the analyser by removing the plastic cover on the right side of
the analyser.
The battery offers a capacity of over 4 hours of continuous operation with sampling pump and backlight
of LCD in operation.
It can be recharged through the adapter 220 VAC/12, 6 VDC supplied with the analyser
5.5 Internal views
gas sampling pump
Central part: temperature controlled enclosure with built-in infrared NDIR
dual beam CO2and CH4detectors
O2sensor 25%
H2S-High sensor 5000 ppm
H2S-low sensor 5000 ppm
Internal view detectors side GAS 3240 Eff BIOGAS analyser

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Internal view of temperature controlled enclosure for NDIR detectors
CO250%
CH4100%
CO2100%
CH4100%

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Electronics and solenoid valve for selection of H2S sensor (only with GAS 3240 Eff BIOGAS analyser with 2 H2S sensors)
5.6 Gas sampling pump
The ideal flow conditions for a fast and reliable biogas analysis is to keep the sampling flow between 0,7 and 1,2L/min.
The analyser integrates a gas sampling pump allowing a continuous running vacuum pressure of -200 mbar absolute @ 0,75L/min.
For applications requiring higher vacuum pressure and/or lower flow rate, please consult us.

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5.7 Sample gas conditions at analyser inlet
Biogas is usually a wet gas that contains some impurities. The gas must be filtered upstream
of the analyser. The analyser already has a removable filter in the outer compartment on
the left side.
In option we can deliver a gas sampling line including a probe containing a changeable pre-
filter and an external desiccant filter.
Note desiccant filter
Standard desiccant filter comes with silica gel for simultaneous absorption of moisture
and H2S, which is suitable for analysers that are not equipped with a H2S measuring cell.
The absorber material can be replaced when it is saturated (change of colour)
If the analyser has a H2S measurement cell, the silica gel must be replaced by coarse salt
(eg. salt for dishwashing machines) as the silica gel absorbs H2S and therefore will provide
wrong measurement of H2S
Sampling gas requirement
Remove water vapour, dust (< 1µm), oil traces and tar (see
accessories next page)
Gas flow
0.75 to 1.2 l/minute
Pressures
Gas inlet pressure: Pa +50 mbar max. (accidental
overpressure above 50kPa will cause irreversible damages
to NDIR detectors)
Gas outlet pressure: Atmospheric pressure
5.8 Environmental conditions
Following environmental conditions shall be respected when using the analyser:
Working area
Safety zone, or at least at 1m from any gas duct
Ambient temperature
5 - 45°C
Relative humidity
5 - 85%
Ambient pressure
86 - 108kPa
Defect or damaged sampling tubing or connectors cause gas leak.
Toxic and/or explosive gas leak may cause serious accidents.
Inlet pressure shall be kept within the recommended range to avoid leakage if pressure gets too high. High
pressure also can causes irreversible damages to the gas detector.
Always connect the gas exhaust port directly to atmospheric air condition using the delivered outlet tubing.
Always disperse the gas away from people.
Do not use greasy tubing or any greasy components in contact with the gas. Grease may block the gas
sampling circuit or cause auto inflammation with fire risks.
For biogas sampling, we highly recommend the use of the external moisture filter trap delivered as
standard accessory

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5.9 Electric connections
5.7.1 AC/DC adapter
The analyzer is supplied with an external AC/DC adapter generating an output voltage of 12.6 VDC-3A.
This adapter is required to recharge the internal battery of the analyzer.
With a fully charged battery pack, the autonomy of the analyzer is at least 4 hours in operation mode and 10h in standby mode.
The analyzer has a function for setting the activation of the backlight of the LCD.
To increase battery life, the LCD backlight time should be set appropriately for the use of the analyzer. A permanently illuminated
display reduces the battery life.
5.7.2 Output Interface RS232
Always switch OFF the power of the PC and the analyser before connecting the RS232 cable
The analyser has a RS232 serial communication port and comes with a connection cable RS232/DB9 for connection to an external PC
and 2 software for data transfer. DB9/USB adapter cable is available as an option for PCs that do not have an RS232 port with DB9
connector.
The first software (GasAnalyzerMemory) allows the transfer of data stored in the internal memory of the analyser. File created on
the PC is a text file (. txt) which can then be converted into Excel.
The second software (GasAnalyzerRealtime) allows the transfer of real-time measurements (transfer rate of 60 Hz, or one
measurement per second). These software are delivered by email with all the documents and this manual. Please refer to the
specific chapters 7 and 8 installation and configuration software
5.8 Preparation
Please check the following before using the analyzer for the measurement of biogas:
Zero and span drift (span) of the analyzer must be tested before going on the site. If the drift is not within the designed
specifications, namely ± 2% full scale (FS) for NDIR and O2 detectors and ± 3% FS for electrochemical H2S sensor, it will be
necessary to perform a zero calibration and span before using the analyzer.
The sample gas must be free from dust, moisture, oil traces and/or tar. Always use the sample line with moisture absorbing
filter before starting the measurements on a biogas process line. In case of water saturation of the absorber product, small
light blue colored original balls will change of color. In this case, replace the absorber and both cotton pieces in the filter before
using the analyzer.
Connect the exhaust gas hose to the outlet port of the gas analyzer to release the gas directly into the outside atmosphere
away from the work area. H2S is a highly toxic gas, please take all necessary security measures for your safety and that of
people in the vicinity.
When switched on, the analyzer automatically enters in preheating mode, which is displayed in the right bottom corner of the
welcome screen with a warming countdown of 800 seconds.
The analyzer starts an automatic zeroing cycle for the last 120 seconds of the preheating. Please ensure that the analyzer is
installed in a ventilated area with fresh and uncontaminated air, otherwise the accuracy of the analyzer will be altered.
The analyzer is now ready to perform the measurements.

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6. OPERATION
6.1 Warm up
To power on the instrument, press the ON button of the keypad during about 5 seconds until the display is activated.
Power on the instrument and wait 800 seconds for pre-warming and zeroing cycle.
After 680 seconds the analyser automatically performs an auto-zeroing cycle during the last 120 seconds of the warm-up time;
Please check before that the atmosphere around the analyser is fresh air (without gas contamination) and there is no obstruction on
both gas inlet and outlet ports of the analyser.
At the end of the zeroing cycle, the analyser enter is measurement mode and is now ready for starting measuring accurately biogas.
If you want to exit the warm-up time and shut off the analyser, press the RIGHT button from the keypad.

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6.2 Measurement screen
The measurement screen shows up to 6 gas compounds that are measured by the analyser and the calculated gas heating value,
with their respective chemical symbol, concentration and unit, as well as the remaining battery autonomy, the date and time and
some functions :
-Activation of the gas sampling pump (press UP and DOWN buttons to start and stop running the pump)
-Record function (press the LEFT button to access to the configuration of the record function)
-Zero function (press the RIGHT button to start a zeroing cycle)
-Access to the set up menu (press ENTER button to access to the set Menu)
-Escape button (press ESC to exit a configuration menu and/or return to the measurement screen)
6.3 Auto ZERO function
From the measurement screen you can activate the auto-zero function by pressing the button.
Air Zero function