GREEN INSTRUMENTS G36p User manual

G36p
Oxygen Analyzer Manual
Document ID number.: 01381

Program Menu Structure
2
<
+/--
<
+/--
<
Figure 1: Program menu structure of the G36pOxygen Analyzer

G36pOxygen Analyzer
Version 2.11 –Revision March 2022 3
Content
1INTRODUCTION..................................................................................................5
1.1 ABOUT THIS MANUAL.........................................................................................................5
1.2 INQUIRIES AND FEEDBACK..................................................................................................6
1.3 ABOUT THE ANALYZER.......................................................................................................6
2ANALYZER SPECIFICATIONS...............................................................................8
3ANALYZER INSTALLATION &CONNECTIONS.........................................................9
3.1 CONTROLAT DELIVERY......................................................................................................9
3.2 WHERE TO INSTALL THE ANALYZER.....................................................................................9
3.3 SAFETY ASPECTS............................................................................................................10
3.4 ELECTRICAL CONNECTION...............................................................................................12
3.4.1 Power Supply ..................................................................................................13
3.4.2 Sensor Connections –SEN.............................................................................13
3.4.3Relay Outputs –D-OUT ..................................................................................13
3.4.4 Input Connections –A-IN.................................................................................15
3.4.5 Analog Output Connections –A-OUT .............................................................16
3.4.6 SD Card...........................................................................................................16
3.4.7 Other Connections...........................................................................................17
4MENU STRUCTURE ..........................................................................................18
4.1 MAIN MENU ....................................................................................................................18
4.2 GRAPH MENU .................................................................................................................19
4.3 INFORMATION MENU........................................................................................................21
4.4 CALIBRATION MENU.........................................................................................................21
4.5 TOOLS MENU..................................................................................................................22
4.6 NAVIGATING THE MENU STRUCTURE.................................................................................24
5CONFIGURATION &COMMISSIONING.................................................................25
5.1 SETTING OF BASIC DISPLAY PARAMETERS........................................................................25
5.2 SETTING OF ALARM LIMITS...............................................................................................26
5.3 SETTING OF THE ANALOG INPUT.......................................................................................27
5.4 SETTING OF ANALOG OUTPUTS........................................................................................28
5.4.1 Analog Output 1...............................................................................................28
5.4.2 Analog Output 2...............................................................................................30
5.5 BACK-FLUSHING &AUTO CALIBRATION.............................................................................30
5.6 LOADING DEFAULT SETTINGS &FACTORY SETTINGS.........................................................31
5.7 COMMISSIONING OF THE ANALYZER..................................................................................32
6CALIBRATION..................................................................................................34
6.1 CALIBRATION WITH KNOWN OXYGEN GASES.....................................................................34
6.2 ARTIFICIAL CALIBRATION OF OXYGEN SIGNAL ...................................................................36
7ROUTINE MAINTENANCE..................................................................................37
7.1 ANALYZER.......................................................................................................................37
7.2 CALIBRATION...................................................................................................................37
7.3 SENSOR .........................................................................................................................37
7.4 GAS CONNECTION...........................................................................................................38

Content
4
8TROUBLE SHOOTING....................................................................................... 39
9SPARE PARTS................................................................................................. 41
10APPENDIX ...................................................................................................... 43
10.1 SETTING OF ANALOG INPUT............................................................................................. 43
10.2 CUTOUT DIMENSIONS ..................................................................................................... 45
Table of Figures
FIGURE 1: PROGRAM MENU STRUCTURE OF THE G36P OXYGEN ANALYZER (INSIDE COVER).................. 2
FIGURE 1-1: SIMPLIFIED SCHEMATIC OF THE ZIRCONIA CELL ............................................................... 7
FIGURE 3-1:THE G36P CONNECTION TERMINALS ............................................................................ 12
FIGURE 4-1:THE G36P MAIN MENU AND FOUR FUNCTIONAL MENUS .................................................. 18
FIGURE 4-2: HISTORY AND SETTINGS .............................................................................................. 20
FIGURE 4-3: NAVIGATING THE MENU STRUCTURE............................................................................. 24
FIGURE 5-1: BASIC DISPLAY SETTINGS ............................................................................................ 25
FIGURE 5-2: SETTINGS OF ALARM LIMITS......................................................................................... 26
FIGURE 5-3: SETTINGS OF ANALOG OUTPUT 1.................................................................................. 28
FIGURE 5-4: SETTING OF BACK-FLUSHING....................................................................................... 31
FIGURE 6-1: CALIBRATION MENU STRUCTUREAND QUICK GUIDE ....................................................... 35
FIGURE 10-1: MAIN MENU IF THE ANALOG INPUT IS AGREED TO BE USED............................................ 43
FIGURE 10-2: CUTOUT DIMENSIONS FOR G36P OXYGEN ANALYZER ................................................. 45

G36pOxygen Analyzer
Version 2.11 –Revision March 2022 5
1Introduction
1.1 About this Manual
This manual contains data and instructions for the installation, operation, and mainte-
nance of the G36p Oxygen Analyzer.
The instructions have been made in general terms and do not take into consideration a
specific installation. The instructions & figures have been made in general terms and do
not take into consideration specific installations. The figures used in the manual are only
for general illustration purposes. As such, the instruction manual is designed only for the
G36p Oxygen Analyzer.
The instructions for the installation, operation, and maintenance of the complete analyz-
ing system including sampling board designed for the G36 Oxygen Analyzer by Green
Instruments A/S are provided in a separate manual.
This manual does not describe all possible situations but only the most common and
known situations and cannot replace the necessary education of the personnel. Should
situations not described in the manual occur which cannot be solved in accordance with
normal known practice and good workmanship, the operator should contact Green In-
struments A/S for instructions.
Attention
Before operation read all instructions and warnings within this manual and
associated documentation. Improper use may cause personal injury and/or damage
of equipment and may void the warranty.
Green Instruments A/S disclaims any responsibility for damage and/or injury
caused by improper installation, use or maintenance of the equipment.
Green Instruments A/S reserves the right to minor alterations and improvements owing to
developments without being obliged to enter the corresponding changes in this manual.
Green Instruments A/S reserves the copyright of the manual. Without prior written per-
mission of Green Instruments A/S, the manual may not be copied and given to unauthor-
ized people.

Introduction
6
1.2 Inquiries and Feedback
All claims and inquiries for spares shall be addressed to Green Instruments A/S or our
distributors.
In all correspondence or when ordering spare parts, please carefully state the equipment
type and serial number which can be found on the label on the back of the analyzer.
Green Instruments A/S appreciates all feedback and suggestions for improvement. If any
questions appear or any discrepancies can be found in the manual, kindly contact Green
Instruments:
Green InstrumentsA/S
Erhvervsparken 29
DK-9700 Brønderslev
Denmark
Phone: + 45 9645 4500
Fax: [phone]
E-mail: [email protected]
Web: www.greeninstruments.com
1.3 About the Analyzer
The G36p Oxygen Analyzer continuously measures the content of oxygen with concen-
trations up to 21.0 %. The analyzer can be used to measure the content of oxygen in N2
or CO2 based inert gas, or in stack gas, or in connection with exhaust gas recirculation
(EGR). The G36p Oxygen Analyzer is designed for front panel mounting.
The G36p Oxygen Analyzer uses a zirconia sensor. The zirconium dioxide sensors have
long been established as industry standards. The G36p uses a new type of zirconia sensor,
which can be used in a wide range of applications.

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The most important element of
the sensor is the zirconia cell.
At high temperatures, the oxy-
gen ions can diffuse through
the zirconium dioxide mem-
brane. When the membrane is
exposed to environment that
contains different amounts of
oxygen (e.g. the sensor inter-
nal reference gas on one side
and sample gas on the other),
nature seeks to balance itself,
and the transportation of ions
through the membrane will
generate an electrical charge.
Sample Gas
Ambient Air
Zirconium Dioxide Membrane
O2–
O2–
ZrO2
O2
O2
O2
O2
O2
O2
O2
O2
O2
V
e–e–
Figure 1-1: Simplified schematic of the zirconia cell
This charge depends on the amount of the passing oxygen ions i.e. the difference between
the oxygen levels in the sample gas and the reference gas. This voltage will be detected
and converted into a signal that is proportional to the oxygen concentration in the sample
gas. The signal will be processed in the analyzer and the oxygen concentration of the
sample gas will be shown in the display.
The G36p Oxygen Analyzer has CE and MED markings as well as DNV, Bureau Veritas
and Lloyd's Register Type Approvals.
Download all product certificates at https://greeninstruments.com/

Analyzer Specification
8
2Specifications
G36p Analyzer
Analyzer types:
•Inert Gas O2Analyzer
•Stack Gas O2Analyzer
•EGR-O2Analyzer
Monitors O2content in inert gas (N2or CO2based)
Monitors O2content in stack gas
Monitors O2content in exhaust gas recirculation
Sensor types
Zirconia sensor type SEN1 or SEN9
Measurement range
0.0 % …21.0 % O2
Ambient temperature
0°C … 70°C
Ambient humidity
Up to 100 % at all relevant temperatures
Power supply
24 VDC
Power consumption
Max. 40 VA per analyzer –recommended fuse: 4 AT
Sample flow
0.2 … 8.0 l/m
Sample temperature
SEN1: ≤ 250 oC; SEN9: ≤ 650 oC
Sample pressure
SEN1: max.1 bar; SEN9: max. 4 bar
Digital display
Touch screen 71 x 39 mm
Output signals
Active 4…20 mA – range selectable –default 0.0…25.0
%
Load output (max.)
600 ohm/24 VDC
Relays
4 relays, volt free, 24 V AC/DC, 5 A
Alarm functions
Low or High O2level –set points freely configurable
High-High O2level –set point freely configurable
System failure alarm
Response time*
90 % of measuring scale in less than 45 sec. with sample
flow rate of 0.8 l/m, sample line of 1 m
Repeatability
+/–0.1 % of the measuring range
Linearity/Accuracy
+/–0.5 % of the measuring range
Drift (one month)
+/–0.1 % of the measuring range
Dimensions
Cut-out dimensions
95 × 178 × 71 mm (H×W×D)
75 x 155 mm (H x W)
Weight (analyzer only)
0,8 kg without packaging
Enclosure
IP55 when the included gasket is mounted
Optional: O2 analyzer with pressure compensation module, BV’s product certificate.
Specifications are subject to changes without notice.
* Response time depends on the sample flow rate and the length of the sample line.

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3Installation & Connections
Read this chapter in its entirety before installing the analyzer.
3.1 Control at Delivery
When you receive the G36p Oxygen Analyzer, control that the received scope of supply
is in accordance with the packing list and nothing is damaged. Any discrepancy should be
reported to the supplier immediately. If any of the received parts are damaged, the ship-
ping company should be informed, and new parts should be made available before com-
pleting the installation
3.2 Where to Install the Analyzer
The G36p is designed for front mounting in control panels. To obtain IP55 tightness, the
included gasket must be mounted between the hole that is cut in the panel and the display
front.
Satisfactory operation, faultless functions, and minimal maintenance of the G36p are
achieved by paying attention to the following notes:
•The equipment should be installed in a clean area away from dust, oil mist, and mois-
ture. The analyzer should be installed at viewing level in an area with good access for
operating and servicing. The location and installation of the analyzer must be chosen,
so that the ambient temperature is below 70C at any time.
•The gasses supplied to the sensor must have a constant flow and pressure. This flow
and pressure control is achieved with the sampling system that is typically delivered
with the analyzer. Please consult the respective manual or contact Green Instruments
A/S.
•The sensor houses for both SEN1 and SEN9 have 1/8” BSP connection. Sampling
tube and vent line should be arranged in the way which ensures the flow and pressure
at sensor house constant and within the required range.
•The sensor can be installed up to 6 m from the analyzer. The sensor and the sensor
house shall be mounted horizontally (sensor pointing sideways) or downwards (sen-
sor pointing down) to prevent the water condensation collecting at the sensor house.

Analyzer Installation & Connections
10
3.3 Safety Aspects
Attention
•Follow the operating instructions!
•Make sure that all power and signal cables are connected correctly before
operating the analyzer.
•The sensor must not be exposed to strong mechanical shocks. Otherwise the
sensor element may crack without visible damage.
•The sensor and sensor housing are hot and can cause severe burning of
personnel if not handled with care.
•The G36p Oxygen Analyzer is only suitable for installation in a safe, non-
hazardous area and not suitable for use with flammable sample gases.
•The installation and operation of the G36p OxygenAnalyzer and associated
equipment must be carried out by skilled, trained, and certified personnel.
Green Instruments A/S does not take any responsibility for the operation of the
analyzer and associated equipment whatsoever.
•The analyzer must only be applied as described in this instruction manual. If
the analyzer is used in a manner not specified by Green Instruments, the
protection provided by the analyzer may be impaired.
•Successful and safe operation of this equipment is dependent upon proper
handling, installation, operation, and maintenance.
Hazardous voltage!
Always disconnect the power before installing or servicing the analyzer. Ignoring this
warning can result in severe personal injury or material damage. Read the manual care-
fully to ensure that all power and signal leads are connected correctly.
Make sure that the analyzer is connected to the correct voltage (see rating marked on the
analyzer name plate).
Circuit breaker!
The installation must include a way to switch off the electrical power by a clearly marked
switch or circuit breaker external to the analyzer. The external switch or circuit breaker
shall be placed in close proximity to the analyzer and within easy reach of the operator.

G36pOxygen Analyzer
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Overload protection!
For compliance with the IEC 61010-1 (2003) safety requirements, the installation must
include a means of overcurrent protection to provide protection against excessive energy
being drawn from the power supply system in case of a fault in the analyzer.
Installation and fault finding!
Electrical installation and fault finding on the analyzer should only be undertaken by a
suitably trained and qualified engineer.
EMC!
For compliance with the EMC product standard IEC 60533 (1999), the connection cables
for the main supply, relays, interface, and analog output signals should be shielded or
provided with equivalent protection. Special precautions have to be taken in connection
to "long" signals or control lines of more than 30 meter.
Sensor!
The sensor must not be exposed to strong mechanical shocks. Mechanical shocks may
cause the sensor element to crack without visible damage.
The sensor must be connected to the analyzer before the analyzer is powered up (risk of
damage). As soon as the analyzer is under voltage, the connection to the sensor must not
be interrupted. Therefore, please disconnect the power when you need to connect or dis-
connect the sensor.
Connections!
The power supply and all electrical connections are accessed at the back of the analyzer.
Poisonous gases!
Both sensor types, SEN1 and SEN9 are not suitable for installation in an area with a high
concentration of methane (CH4).
Besides, a reduced lifetime can occur if the sensor is subjected to lead, phosphor, silicon,
halogens, or high concentration of sulfur.
Recycling!
Please do not dispose the G36p Oxygen Analyzer with regular refuse. Disposal should be
in accordance with the requirements of the current statutory regulations.
Symbol identification
Caution, risk of danger
Caution, hot surface
Caution, risk of electrical shock
Protective earth
The CE mark proves the compliance of the instrument with the requirements of
the relevant EU directives

Analyzer Installation & Connections
12
3.4 Electrical Connection
Note
Each analyzer will be configured at the factory to be either:
•An Inert Gas Oxygen Analyzer for monitoring O2 in inert gas
•A Stack Gas Oxygen Analyzer for monitoring O2 in stack gas
•An EGR Oxygen Analyzer for monitoring O2 in the EGR system
For the default configuration and connection of each analyzer, check the Testing &
Configuration Sheet attached to each analyzer.
The electrical connections are dependent on the actual system configuration. The termi-
nals are all located on the back of the analyzer. For details, please see Figure 3-1. Only
those functions to be used shall be connected.
Please choose the cables that fulfill the following requirements:
Wire size for analog input and CAN connection: 1 x 1.0 mm2 w/screen
Wire size for all other connections: 1 x 1.5 mm2 w/screen
SD-CARD
CAN
4. A-OUT 2 + 5. A-OUT 2 –
1. A-OUT 1 +
2. A-OUT 1 – 3. NOT USED
A-OUT
6. GND
5. Oxygen heat
4. NOT USED
3. Oxygen 2. Oxygen 1. Oxygen
1. A-IN 1 +
2. A-IN 1 –
24 V DC
8.3 COM
1.1 NC 2.1 COM 3.1 NO
4.2 NC 5.2 COM
6.2 NO 7.3 NC 9.3 NO 10.4 NC
11.4 COM 12.4 NO
D-OUT SEN
A – IN
ON OFF
2AT – Fuse
5x20
FUSE
Figure 3-1: The G36p connection terminals

G36pOxygen Analyzer
Version 2.11 –Revision March 2022 13
3.4.1 Power Supply
The power supply terminal is located at the bottom right corner and is marked supply rat-
ing (24 VDC). For details please see figure 3-1. Before connecting the power supply,
please make sure that the power supply rating of the analyzer corresponds with the power
supply available.
3.4.2 Sensor Connections –SEN
The analyzer is equipped with either a SEN1 or a SEN9 sensor (see the Testing & Con-
figuration Sheet). The sensor is connected to the terminal SEN in the analyzer.
Note
Each analyzer is delivered with cable connections that are fit for use for either
SEN1 or SEN9. See chapter 9 for the spare parts.
The sensors are connected to the terminal SEN as follows:
Terminal SEN
Pins at SEN1
Pins at SEN9’s connection
Terminal 1 (Sensor electrode)
3
1(black)
Terminal 2 (Sensor electrode)
2
2 (yellow)
Terminal 3 (Sensor electrode)
1
3 (red)
Terminal 4 (No connection)
Terminal 5 (Sensor heating)
4
4 (grey)
Terminal 6 (Ground)
5
5 (white)
The cable between sensor and the analyzer can be delivered up to 6 m in length.
3.4.3 Relay Outputs –D-OUT
The analyzer is arranged with four relay outputs connected to D-OUT with 12 terminals.
It is important to note that the configuration of the analyzer might deviate from the con-
figurations listed below. Please see the Testing & Configuration Sheet that is attached to
each analyzer.
The default relay functions, and connections of the Inert Gas Oxygen Analyzer are as fol-
lows:

Analyzer Installation & Connections
14
Relay No.
Relay function
Terminal Connections
Relay 1
Alarm High/Low
O2 level
Terminals 1.1-2.1-3.1
(NC-COM-NO)
Inverted
Normally ener-
gized
Relay 2
Alarm High High
O2 level
Terminals 4.2-5.2-6.2
(NC-COM-NO)
Inverted
Normally ener-
gized
Relay 3
System failure
alarm*
Terminals 7.3-8.3-9.3
(NC-COM-NO)
Inverted
Normally ener-
gized
Relay 4
Calibration Span
Gas
Terminals 10.4-11.4-12.4
(NC-COM-NO)
Normally
de-energized
The Stack Gas Oxygen Analyzer relay functions and connections are as follows:
Relay No.
Relay function
Terminal Connections
Relay 1
Alarm
High/Low/High-High
O2 level
Terminals 1.1-2.1-3.1
(NC-COM-NO)
Inverted
Normally ener-
gized
Relay 2
System failure alarm
Terminals 4.2-5.2-6.2
(NC-COM-NO)
Inverted
Normally ener-
gized
Relay 3
Auto Back-flushing
Terminals 7.3-8.3-9.3
(NC-COM-NO)
Normally
de-energized
Relay 4
Auto-Calibration
Terminals 10.4-11.4-12.4
(NC-COM-NO)
Normally
de-energized
Alarms
The values for three O2 level alarms (Low, High, and High-High) can be set following
instruction in section 5.2.
The system failure alarm includes a sensor alarm and alarm for open loop of the analog
outputs.
Normally energized
Normally energized means that the relay is energized in the alarm free condition during
operation. The relay will be de-energized when there is an alarm or when the supply volt-
age disappears from the analyzer. Thus, the normally energized relays will give a fault
signal in the event of failure of power to the analyzer.

G36pOxygen Analyzer
Version 2.11 –Revision March 2022 15
Normally de-energized
Normally de-energized means that the relay is de-energized in the normal operating con-
dition. For the Inert Gas Oxygen Analyzer, relay 4 (normally de-energized) will be ener-
gized in span calibration condition. For the Stack Gas Oxygen Analyzer or the EGR Ox-
ygen Analyzer, relay 3 or 4 respectively will be energized when the analyzer is back-
flushing or auto calibrating.
3.4.4 Input Connections –A-IN
The analog input connections A–IN are placed next to the sensor connections SEN. The
terminal is arranged with two poles for one active analog input signal 4…20 mA (Analog
Input 1). Active input signal means signal voltage from external source.
For setting of the analog input please see appendix 10.1.

Analyzer Installation & Connections
16
3.4.5 Analog Output Connections –A-OUT
There are two active 4…20 mA output signals*for load up to 600 ohm. The configura-
tion is as follow:
Terminals 1 & 2
=
Analog Output 1 for the remote indication of oxygen level
Terminal 3
=
No connection
Terminals 4 & 5
=
Analog Output 2 (optional)
* Active output signal means signal voltage from the G36panalyzer.
For setting of analog outputs please see section 5.4.
3.4.6 SD Card
The SD card is used for storage of the historical trend of O2and the logbook. The SD
card can also be used to load a new software version to the analyzer.
Data log
The internal memory of the analyzer measures and saves six values every minute. How-
ever, the internal memory can only store one hour of logging, which is equal to 360 log
values. If there is no SD card installed the new log values will supersede the old log val-
ues. This means there will be no historical trend curve and alarm logs as well.
However, if you place an SD card in the analyzer, the internal memory will be saved on
the SD card every minute. If the analyzer alarm and logbook functions are ON, the
alarms will also be logged on the SD card.
There are two log files in the SD card, a log file for O2values g1x.log and a log file for
alarms g1x.alm.
Attention
The log files can be read directly from the SD card using a Windows-operated
computer. The user has to use Notepad.
Do not open the log files in WordPad. WordPad will damage the format of the log
files, and the analyzer will be unable to log any more data on the SD card.

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Version 2.11 –Revision March 2022 17
The best way to read the log files is to copy them to the local disk of your computer and
then open them from your computer. This way, you can use any program that can open a
txt-file including Notepad, WordPad, MS Word and MS Excel
The data in the log file –g1x.log includes 5 columns, i.e.:
YYYY-MM-DD
HH:MM:SS
Datalog of A–OUT
1 (O2*100)
Datalog of A–OUT 2
Unix time
2009-11-12
13:01:54
2089
0000
1258027314
The SD card shall be replaced after two years due to the limited capacity.
Software and default configuration uploading
The folder bin at the SD card includes two files: G1.bin and g1parm.bin.G1.bin is the
software file and g1parm.bin is the default configuration file.
If Green Instruments delivers a new software version with two files named G1.bin and
g1parm.bin, the following steps will guide you through the installation:
•Replace the old files at the SD card with the new files G1.bin and g1parm.bin that
you have received.
•Set the SD card back in the analyzer. Then, restart the analyzer. Now the analyzer
will automatically check the SD card to see if there is a new software version. If yes,
the new software will automatically be loaded to the internal memory of the analyzer.
•After uploading the new software version, reload our default settings by choosing
Load default settings in Tools setting\Service (password level 2)\Load default set-
tings.
•After uploading the new software version, you have to reset the analyzer following
the instructions in chapter 5.
3.4.7 Other Connections
The CAN connection is not in use by default.

Menu Structure
18
4Menu structure
Please see Figure 1 for the Program Menu Structure
4.1 Main Menu
The analyzer is designed with a touch screen. The Main Menu displays the current oxy-
gen value in percent, and to the right four function keys are displayed. The function keys
are connected to four different functional menus: Graph, Information, Calibration and
Tools.
<
Figure 4-1: The G36p main menu and four functional menus
If the alarm function is on and the alarm condition starts, the alarm message will be dis-
played at the bottom left corner of the screen.

G36pOxygen Analyzer
Version 2.11 –Revision March 2022 19
4.2 Graph Menu
Pressing changes the display into a graphical mode in which a trend curve of the log
values (Y-axis) is shown on a time scale (X-axis).
The actual oxygen value in percent is displayed in the upper right corner of the graph
screen as Current.
The trend curve displays the log values from the SD card. The trend screen has 108 dots
in the timeline. Therefore, the trend curve will show 1 log value per dot if the X timing is
set at 18 minutes (6 log values/minute x 18 minutes = 108 values). If the X timing is less
than 18 minutes, the trend curve will be shown as a dotted line.
If the X timing is 36 minutes, two values will be printed at the same X-position. Similar-
ly, if the X-timing is 180 minutes, 10 values will be printed at the same X-position with
all different Y values.
Pressing gives access to the History time menu, where you can choose to see the
trend curve in a specific historical period and change the setting for the trend curve.
Note for Stack Gas Oxygen Analyzer
During back-flushing, the Current status is changed to Frozen with the oxygen
value measured before the backflushing.
During auto calibration, the Current status is changed to Frozen with the oxygen
value measured before the calibration.
History time & Graph settings
To see the trend curve in a specific historical period, it is possible to change the values
in Date & Time. If for example it is now 12:28 and you want to see the trend curve at
11:00 you must go through the following steps
•First, select Time and enter the historical point of time.
•Then, select Locate history point, and the screen will show to the trend curve at that
specific time.

Menu Structure
20
Y-limits shows the maximum measurement range displayed in the trend curve. Default
setting is 25 %. Y-limits are displayed in the top left corner of the graph screen as Max.
+/--
+/--
+/--
+/--
Figure 4-2: History and settings
It will take time for the analyzer to
browse an old history point. The longer
time you want to go back, the longer
time the analyzer will require to recall
the history. When the analyzer is re-
calling history, the touch screen will
freeze and will not immediately react
to touching.
If you want to browse a history point
that dates back more than a week, it
will be best to read the history data di-
rectly from the log file at the SD card.
For details of how to read the log file,
please refer to section 3.4.6.
X-timing shows the time range of the
trending graph, which can be set as re-
quired. However, the time range
should not be over 1440 minutes (24
hours). The time range is displayed on
the lower part of the graph screen with
the starting point in the bottom left
corner and the ending point in the bot-
tom right corner.