Systech Instruments EC900 series Assembly instructions

Illinois Instruments, Inc. (U.S.)
2401 Hiller Ridge Road
Johnsburg
Illinois IL
60051
Systech Instruments Ltd
17 Thame Park Business Centre
Wenman Road
Thame
Oxfordshire
OX9 3XA
E: [e-mail]
E: [e-mail]
www.systechillinois.com
SERIES EC900
OXYGEN ANALYZERS
(Covers MK3 USB models)
OPERATOR’S INSTRUCTION
MANUAL
Version 4.7 5th February 2014

EC900 Series Operation Manual V4.7
www.systechillinois.com
Table of Contents
1.0 PREFACE..................................................................................................................................1
1.1 Important..........................................................................................................................................2
2.0 INTRODUCTION.......................................................................................................................3
3.0 WARRANTY..............................................................................................................................4
3.1 Instrument Warranty.........................................................................................................................4
3.2 Measuring Cells Warranty................................................................................................................4
4.0 ISOLATION VALVE OPERATING ORDER..............................................................................5
5.0 PRINCIPLE OF OPERATION...................................................................................................5
6.0 TECHNICAL SPECIFICATIONS...............................................................................................6
7.0 INSTALLATION ........................................................................................................................8
7.1 Instrument Installation......................................................................................................................8
7.2 Gas Installation ................................................................................................................................9
7.3 Electrical Installation ......................................................................................................................10
8.0 USING THE INSTRUMENT.....................................................................................................10
9.0 INSTRUMENT OPERATION...................................................................................................11
10.0 CHANGING PROGRAMME CODES......................................................................................12
10.1 Front Panel Guide........................................................................................................................13
10.2 Data Table Programmable Functions...........................................................................................14
11.0 PROGRAMME CODES...........................................................................................................17
13.0 CALIBRATION........................................................................................................................20
13.1 Calibration with Atmospheric Air ..................................................................................................20
13.2 Calibration with Certified Gas.......................................................................................................21
13.3 Automatic Calibration option ........................................................................................................22
14.0 USB and RS485 COMMUNICATIONS...................................................................................24
14.1 Installing the USB Driver Software...............................................................................................24
14.2 Installing the COMMS UTILITY SOFTWARE...............................................................................25
14.3 Determining the installed Comms Port.........................................................................................28
14.4 Running the COMMS Utility Software. .........................................................................................30
14.5 USB Commands For Use with the EC900....................................................................................32
14.6 RS485..........................................................................................................................................33
15.0 OPTIONAL FACILITIES..........................................................................................................34
15.1 Analogue Outputs (Option)...........................................................................................................34
15.2 Alarm Trip (Option).......................................................................................................................34
15.3 Sample Pump...............................................................................................................................35
16.0 FAULT MESSAGES/ALARMS...............................................................................................36
17.0 REPLACING THE MEASURING CELL..................................................................................37
17.1 Resetting the Calibration Range and Life Counter.......................................................................38
18.0 SPARE PARTS .......................................................................................................................39
19.0 SERIAL NUMBER SUFFIX DETAILS ....................................................................................41
Appendix 1 Drawing Number B900-176.........................................................................42

EC900 Series Operation Manual V4.7
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Appendix 2 Drawing Number 920 043_B .......................................................................43
Appendix 3 Drawing Number B 900 180 ........................................................................44
Revision History
Issue
Issue Date
Changes
By
1.1
09-05-2008
Current Release Version
Jon Dawson
2.0
18-08-2009
Format changes, updated some drawings
Nick Stuart
4.0
09-08-2010
Updated to the USB comms model
Nick Stuart
4.1
19-08-2010
Added 0-10V output details.
Nick Stuart
4.2
02-06-2011
Added details for mk 6 PCB, also corrected p16.
Nick Stuart
4.3
20-12-2011
Added info regarding Auto Cal initiation. Re: CI 4162
and SPn2# value.
Nick Stuart
4.4
25-04-2012
Clarified “Delay” for alarm settings. Ref CI 4176
Nick Stuart
4.5
24-08-2012
Amended the flowmeter part numbers
Nick Stuart
4.6
15-11-2013
Added Warranty and other information regarding cells.
Updated Wall mount dimensions 920 043.
Bryan Cummings
4.7
5-02-2014
ECN 1404s, All RACEcell instruments now have
dual life displays.
Bryan Cummings

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1.0 PREFACE
The EC900 series of oxygen analyzers exist with a number of variations, with different cabinet types
and different measuring cells, these variations are covered in this manual.
We are always trying to improve our product, of which this manual is part, so we would greatly
appreciate any information you can give us of any difficulties you may encounter with the analyzer or
the manual.
This symbol is known as the ‘Crossed-out Wheelie Bin Symbol’. When this symbol is marked
on a product it means that consideration should be given to the disposal of the product, parts
or accessories. Only discard electrical/electronic items in separate collection schemes which
cater for the recovery and recycling of the materials contained within. Your co-operation is
vital to ensure the success of these schemes and for the protection of the environment.

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1.1 Important
Please read this manual before attempting to install or operate the equipment.
The equipment should be electrically connected and grounded in accordance with the instructions
attached to the power cord and in accordance with good standard practice.
No responsibility is accepted by Systech Illinois
for accidents resulting from improper use of this equipment.
All service and technical enquiries are covered from our factories in Thame, Oxfordshire, and
Johnsburg, Illinois where we will endeavour to give a quick and helpful response to all queries.
The factory addresses are:
Illinois Instruments, Inc (U.S.)
2401 Hiller Ridge Road,
Johnsburg
Illinois IL 60051
Tel: [phone]
Systech Instruments Ltd
17 Thame Park Business Centre
Wenman Road
Thame
Oxfordshire
OX9 3XA Tel: [phone]
For customers outside UK or USA, please contact us for details of your local representative.
Alternatively check out our website:
www.systechillinois.com

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2.0 INTRODUCTION
The EC900 Series of instruments may be supplied in three types of cabinet/housing and may use any
one of four measuring cells, suitable for different applications.
The instrument may also be fitted with other customer specified options.
Please refer to Table 1 below, for the configuration code and an explanation of the instrument
numbering system.
When particular attention should be given in this manual to a particular configuration the paragraph
will be preceded with a configuration specification i.e.
EC91x
=
Panel/Bench mounting
EC92x
=
Wall mounting
EC9x1
=
Trace analysis
Series EC900 Oxygen Analyzers
Cabinet - Mounting
EC9
Panel or bench mounting
1
Wall mounting IP66
2
Rack mounting (*Note 1)
3
Cell type / range
% analysis
0
Trace analysis
1
Ultra low trace analysis
2
RACE
3
Configuration code =
EC9
x
x
Table 1 Configuration codes
* Note: 1 A rack mounting case is 19" wide, 4U high. This provides a housing suitable for 1 or 2
analyzers.

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3.0 WARRANTY
3.1 Instrument Warranty
This Instrument is guaranteed for a period of one year from its delivery to the purchaser covering
faulty workmanship and replacement of defective parts. This assumes fair wear and tear and usage
specified on the data sheet. It does not cover routine calibration and housekeeping.
Warranty covers parts and labour on a “return to base” basis. Any on-site warranty visits may be
chargeable in terms of travel and expenses.
We maintain comprehensive after sales facilities and the instrument should be returned to our factory
for repair, servicing or routine calibration if this is necessary. Service agreements are available and
can include routine maintenance at the customers site, please contact Systech / Illinois Instruments
for more details.
The warranty does not extend to sensors overexposed to oxygen during the warranty period, or to
those whose elements have been damaged by surges of undue pressure.
The type and serial number of the instrument should always be quoted, together with full details of
any fault.
3.2 Measuring Cells Warranty
Please note the Warranty code against the part number of the measuring cell installed by referring to
the Spare Parts section.
Code
Warranty
Typical Life and Notes
A
6 Months from
the date of
supply.
The measuring cell should have a life of 4+ years. The life is very much
dependent on the moisture in the gas stream. The more humid the gas
(as long as it is non-condensing) the longer the life. The primary reason
for premature failure is exposing the cell to air, or to subject the cell to
high pressure.
B
12 months from
the date of
supply.
The measuring cell should have a life of 3+ years. Cells measuring
Oxygen concentrations of less than 10% should have a lifetime of 5+
years. The life is very much dependent on the moisture in the gas stream.
The more humid the gas (as long as it is non-condensing) the longer the
life. The primary reason for premature failure is exposing the cell to high
pressure.
C
36 months from
the date of
supply
The measuring cell should have a life of 5+ years.
D
Cells have a full
warranty of 6
months from
the date of
supply.
Between 6
months and 36
months a
partial warranty
applies.
A credit will be given for complete calendar months remaining up to 36
months. The credit is calculated from (36 - months in use)/30. A cell for
instance that has failed after 25 months will be credited (36-25)/30 =
0.366 * the current list price. The measuring cell should have a life of 4+
years. The life is very much dependent on the moisture in the gas stream.
The more humid the gas (as long as it is non-condensing) the longer the
life. The primary reason for premature failure is exposing the cell to air, or
to subject the cell to high pressure.

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WARRANTY EXCLUSION
In some instances cells do not achieve their expected lifetime, failing early due to misuse: isolation
valves on the analyser left open causing ingress of high oxygen levels, or cell rupture caused high
pressure being applied across the cell. Misuse of the measuring cell in this way is not covered by the
warranty.
3.2 Measuring Cells Warranty - continued
NOTE
Most cells that do not last their expected lifetime fail because:-
1. The isolation valves on the analyzer are left open, causing ingress of high ambient
oxygen levels.
2. The cell has been ruptured caused by high pressure, usually caused by the isolation
valves being operated in the wrong order. Ruptured cells can be confirmed by
electrolyte solution seeping from the inlet/outlet pipes or by blackening of the same
pipes.
4.0 ISOLATION VALVE OPERATING ORDER.
For analyzers sampling from pressurised supplies:
When opening the cell, open the OUT valve first, followed by the IN valve
When closing, close the IN valve first, followed by the OUT valve.
For analyzer fitted with a pump:
When opening the cell, open the IN valve first, followed by the OUT valve
When closing, close the OUT valve first, followed by the IN valve.
MISUSE OF THE CELL IS NOT COVERED BY WARRANTY
5.0 PRINCIPLE OF OPERATION
The detector contains an anode, electrolyte and an air cathode to which the diffusion of Oxygen is
limited by a diffusion barrier. At the air cathode Oxygen is reduced to Hydroxyl ions which in turn
oxidise the metal anode.
The following reaction takes place at the cathode:
O2+ 2H2O + 4e 4(OH)-
and at anode
2Pb + 4(OH)- 2Pb(OH)2+ 4e
and the complete chemical reaction is represented by
2Pb + O2+ 2H2O 2Pb(OH)2

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6.0 TECHNICAL SPECIFICATIONS
Measuring Ranges:
(All Auto-ranging)
EC9x0
0.3% - 100%
EC9x1
EC9x3
0.1ppm - 30%
EC9x2
0.01ppm - 30%
Calibration
Ranges:
EC9x0
0.3% –100%
EC9x1
EC9x3
0.1ppm –30%
EC9x2
0.01ppm –30%
Response Time:
EC9x0
EC9x1
90% indication in less than 30 seconds
EC9x2
90% indication in less than 30 seconds
EC9x3
Air to less than 20ppm in 2 minutes
Accuracy:
EC9x0
± 0.2% of calibrated value at 20oC
± 1% of calibrated value over temperature range
EC9x1
EC9x3
>10ppm
± 2% of reading at 20oC
± 5% of reading over temperature range
<10ppm
± 2% of reading +0.4ppm at 20oC
± 5% of reading + 0.6ppm over temperature range
EC9x2
>10ppm
± 2% of reading at 20oC
± 4% of reading over temperature range
<10ppm
± 2% of reading +0.2ppm at 20oC
± 4% of reading + 0.3ppm over temperature range

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Technical Specification contd.
Suitable Gases:
EC9x0
All gases except corrosive gases
EC9x1
EC9x2
EC9x3
All gases except corrosive and/or
acidic gases
Display:
4 Digit high visibility LED
Sample connections:
1/8” OD compression (Swagelok)
Ambient Temperature:
-5°C to 50°C (Instrument and sample gas)
Sample Gas Inlet
Pressure:
3.5 –29 PSI (0.25 Bar - 2 Bar)
Ambient (for pump equipped systems)
Power:
90-260 VAC, 40VA
Area Classification:
General Purpose
Communications:
USB 1.0 / 2.0 and RS485
Dimensions:
Refer to the drawing B900 176 at the rear of the manual Appendix 1.
OPTIONS
High / Low Alarms:
Two with volt free c/o contacts fully
configurable over the complete oxygen range,
one fault alarm.
Contact rating 5A @ 250VAC/30VDC
Analogue outputs:
Software configurable over the entire oxygen range for either :
Current: 4-20mA isolated
Current 0-20mA isolated
Flow Alarm:
Thermal Mass Flow sensor
Auto Calibration
(option):
Allows connection to a cylinder of gas with a certified level of oxygen.
Analyzer will correct to recorded level at programmed intervals.
Bypass Flowmeter:
Improves the response time of the analyzer due to sample transport lag by
adding a fast side stream.
Sample Pump
Allows the instrument to be used in situations where there is no pressure to
the sample gas.
Stainless Steel
Fittings
Allows the instrument to be used in situations where the sample gas will
react with either brass or copper fittings and pipes. Note: stainless steel
flowmeter and regulator will also be required.

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7.0 INSTALLATION
7.1 Instrument Installation
The instrument is offered in bench/panel mount, IP66 wall mounting or rack mount. Dimensional
drawings should be referred to at the rear of the manual.
Please read this manual thoroughly before connecting or applying power to the unit. Systech / Illinois
Instruments cannot be responsible for problems arising from improper connection or operation.
Panel mount brackets may be ordered with the bench/panel mount analyzer.
A general view of the Model EC920 weatherproof instrument follows:

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7.2 Gas Installation
The instrument can be used to measure different oxygen concentrations. If the application is the
measurement of percent oxygen, then the instrument may be connected with plastic/nylon/ptfe tubing
otherwise all fittings and sample lines to the instrument should be high integrity so ensuring no
ambient air is allowed to leak into the system.
It is recommended that stainless steel or copper lines be used for the sample inlet.
If a vent line (sample outlet) is fitted then this may be of nylon tubing or similar, but should be
installed so that no back pressure may build up due to a restricted outlet.
The inlet and outlet pipe size is 1/8 inch compression (standard).
The two valves on the gas chassis serve to seal off the instrument from the sample and the sample
inlet valve will also serve as a flow regulator valve.
When a pressurised supply of sample gas has been connected to the instrument, the cell outlet valve
should be opened fully, and then the sample inlet valve should be opened sufficiently to obtain a
desirable flow: approximately 100 - 150ml/min will be adequate.
For analyzers fitted with the pump option, the cell inlet valve should be opened fully and the cell outlet
valve opened sufficiently to obtain 100 - 150 ml/min.
Too high a flow rate will pressurise the measuring cell and cause an error in the reading for some
time.
Conversely, the instrument should be disconnected from the sample by reversing the above
procedures. In other words at no time should the cell be pressurised with the sample inlet pressure,
or by the pump. Failure to follow this procedure may result in irreparable damage to the cell.
NOTE: Instruments fitted with a RACE cell only have one sample isolation valve.
Important
EC9x1
EC9x2
Sample lines and upstream pressure regulators should be thoroughly purged before connecting to
the analyzer. If a bypass flowmeter and adjustment valve has been fitted to the instrument, then the
purging can be achieved easily before the isolation valves are opened.
Pressure Regulation
There is no need to regulate the pressure upstream from the analyzer unless it is either above 29psi
(2 Bar) or can fluctuate wildly, thereby changing the flow through the instrument. If one is measuring
low ppm oxygen and a pressure regulator is necessary, then only a high quality regulator will suffice
(see spare parts.)
If however, the pressure of the sample gas is below 3.5psi (0.25 Bar) and is not enough to pass a
sample through the analyzer, then a pump will be required and the same comments are applicable as
above. Consult Systech / Illinois Instruments for advice.

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7.3 Electrical Installation
EC91x
EC93x
The instrument is operated from AC line power, voltage of between 90 and 260 VAC, 50 –60 Hz.
Automatically sensed by the analyzer.
The IEC standard cable supplied should be connected to a captive plug with an integral earth
connection and wired to a fused supply, as follows:
Brown to Live
Blue to Neutral
Green/Yellow to Earth
Note that the cartridge also contains a fuse. This fuse must be installed to ensure proper operation of
the instrument. It is rated 2A @ 250V, slow-blow type. Replace only with fuses of equivalent ratings.
EC92x
Connect power in accordance with the label on the chassis.
DO NOT SWITCH ON UNTIL YOU READ THE NEXT SECTION –USING THE
INSTRUMENT
8.0 USING THE INSTRUMENT
Start-Up
1. Ensure the sample gas lines have been connected and purged with the advice given in
section 6, Installation.
2. Ensure that the sample pressure is within the specification limits.
3. Ensure the power supplied is correct to the configuration.
4. Apply power. All segments of the LED’s on the display will light and then read the software
version i.e. C2.18. If there are any faults the display will alternate between a display of
oxygen and the fault message. Refer to the Section 16 for explanation of fault messages.

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9.0 INSTRUMENT OPERATION
The instrument is controlled through the four digit keypad and the LED display. Control is also
possible via the USB communication port. Some parameters can only be set using the USB
connection. See the section on Software and the USB port
In measurement mode the instrument displays the oxygen concentration of the sample gas. The
display will auto range dependent upon the measured gas with ppm or % indicated by the LED’s to
the right of the digital display
To access programming mode press the menu button on the 4 digit keypad
The LED above the button will switch on to indicate programming mode and the digital display will
indicate the selected function. The menu button is used to scroll through the available parameters.
When selected the display briefly shows the parameter name and then displays the current value. If
no button is pressed for 5 minutes, the instrument will return to measurement mode.

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10.0 CHANGING PROGRAMME CODES
Changing the programme codes in order to set up alarms, analogue outputs or other functions is
simple .There are two ‘pages’ of information.
Page 0 contains all the functions that the user may want to change frequently, such as setting
Channel 1 analogue output from 0-100ppm to say 0-10ppm.
Page 1 functions are those which will only need to be set up once on commissioning, such as setting
whether the type of analogue output for Channel 1 is 4-20mA or 0-20mA.
Page 1 functions are password protected. The factory default password is 1234.
To enter page 0 functions, as displayed in ‘Data Table Programmable Functions’ ,
Press the ‘programme’ button
The led above it will light and the display will
briefly read PAGE, then 0 (to indicate you are in
page 0). Press the ‘programme’ button again and
the display will read AL1 briefly then the value. As
you can see from the data table what functions
available depend on the type of instrument and
the configuration.
Every time the ‘programme’ button is pressed a new function will be displayed briefly and then the
value for that function. Note - some functions are ‘read only’.
Continual pressing of the ‘programme’ button will eventually show –O2- and this signals the end of
the Programming mode and the instrument is returned to measurement mode.
To enter page 1 functions,
press the ‘programme’ button
The display will briefly read PAGE then 0 (to
indicate you are in page 0).
Now press
Which is the ‘digit select’ button, and the display
will flash.
Now press the
Which is the ‘digit Increment’ button to change the
display from 0 to 1.
Now press the ‘enter’ button,
The display will briefly read PAS? And then 4
digits. To access page 1 you must enter a correct
password. At this point the display will read 0000
or the last 4 digits entered by another user. The
factory set password is 1234 so press the ‘enter’
button to acknowledge this number. The display
will show YES, for a correct password or NO if
incorrect. If you have the correct password then
you will see functions of the page 1.
Note, to get out of page 1, back to page 0 and then to return to the measurement mode you must
keep pressing the programme key until you get to the PAGE function and change the code from 1 to
0 using the method shown above.

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10.1 Front Panel Guide
COMPONENT
FUNCTION
OPERATION
Program
Scroll
Used to scroll through the front panel
menu functions.
Press to select the required data. First
press displays the function code. After
1 second the data relating to the code
is displayed. If the key is pressed
before 1 second then the next function
code is shown. Continue to press the
button until all programme values have
been accessed and -O2- is shown
when the display will revert to the
measurement of oxygen.
Digit Select
Selects display digit to be changed.
Selection is indicated by flashing digit,
first press selects D1 and successive
presses select remaining digits, decimal
point and % and ppm LED’s.
Digit Increment
Increments selected display digit.
Each press steps selected digit through
complete numerical range.
Cycles decimal point position.
Toggles ppm and % LED’s
Enter/Reset
Enters new data into memory for that
function.
Press once to reset the display, after 1
second the display shows STORE to
indicate it has accepted the entry
(otherwise it will show ERR) or other
fault message.
D1 to D4
Displays 0 to 9 and/or decimal point.
Display set by selecting appropriate
digit, then digit increment.
PGM LED
When on, indicates instrument in
program mode.
ALARM 1 LED
Indicates Alarm 1 status.
Illuminated indicates Relay 1 de-
energised and in alarm condition.
ALARM 2 LED
Indicates Alarm 2 status.
Illuminated indicates Relay 2 de-
energised and in alarm condition.
FAULT LED
Indicates fault alarm status.
Illuminated indicates fault relay
energised and in alarm condition.
%
Displayed measured value is %
oxygen by volume.
ppm
Displayed measured value is parts
per million by volume.

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10.2 Data Table Programmable Functions
There are two pages of programme functions. Page 0 are functions that the operator may want to
change frequently, for example alarm trip levels and analogue output scales. Page 1 functions require
a password to enter and have been arranged so that they will normally only require to be set up on
commissioning.
A full description of the Programme Codes can be found in Section 11.

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10.2.1 PAGE 0 Functions
DISPLAY
FUNCTION
PAGE
Can be 0 or 1 indicating which page to move to.
AL1
Sets the numerical value for the first alarm point and
% or ppm.
AL2
Sets the numerical value for the second alarm point
and % or ppm.
OPH1
Sets the analogue output high value for ch. 1
OPL1
Sets the analogue output low value for ch.1
OPH2
Sets the analogue output high value for ch. 2
OPL2
Sets the analogue output low value for ch.2
OPH3
Sets the analogue output high value for ch. 3
OPL3
Sets the analogue output low value for ch.3
SPn1 #
Shows read only value of span for cell 1 (ppm)
normal value is approximately 0.280
SPn2 #
Shows read only value of span for cell 2 (%)
normal value is approximately 0.3
Adjusts the calibration high point to the correct value to
agree with the plant gas, air or certification cylinder.
The gas should be in the range 1%-25%.
SPHi
EC9x3
Adjusts the calibration low point to the correct value to
agree with the plant gas, air or certification cylinder.
The gas should be in the range of 10-1000ppm.
SPLo
EC9x3
Sets the calibration of the analyzer to the correct value
for a known sample gas, plant gas, air or certified
cylinder.
CAL
EC9x0
EC9x1
EC9x2
ACAL*
Sets the O2value for the autocalibrate function.
LIFEL
For all RACEcells this shows the remaining PPM
cell lifetime.
LIFEH
For all RACEcells this shows the remaining % cell
lifetime.
-O2-
Final message before the instrument reverts back to
oxygen measurement.
* These functions will only be displayed and operable if the option has been purchased.
#should you require assistance from a Systech / Illinois Engineer, please note these values for
diagnostic purposes.

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10.2.2 PAGE 1 Functions
DISPLAY
FUNCTION
OL
Sets the configuration of alarm 1 and alarm 2, i.e. high/low, low/high, low/low or
high/high. Also sets whether the alarms are latched or unlatched.
ALHLD*
Should the instrument be configured with alarms and automatic calibration then
with this function a hold can be set on the alarms for the duration of the autocal
and for a further five minutes until the process settles down to equilibrium.
ANHLD*
Should the instrument be configured with analogue outputs and automatic
calibration then with this function a hold can be set on the analogue outputs for
the duration of the autocal and for a further five minutes until the process settles
down to equilibrium.
ANCH1
Sets the configuration of the Analogue output for channel 1. Can be 0 = 4-20mA,
1= 0-20mA or 2=0-10V.
ANCH2*
Sets the configuration of the Analogue output for channel 2. Can be 0 = 4-20mA,
1= 0-20mA or 2=0-10V.
ANCH3*
Sets the configuration of the Analogue output for channel 3. Can be 0 = 4-20mA,
1= 0-20mA or 2=0-10V.
GAS
Sets the molecular weight of the carrier (background) gas.
FLOAL*
Sets the flow in cc/min below which the instrument will trigger a fault alarm.
Acd*
Sets the automatic unattended delay time for the autocalibrate function. A display
of 0 shows the feature is switched off. Units are hours.
PASS
Sets the password to enter Page1 of the menu. Factory delivered 1234. It is
recommended that if changed a note is made.
PAGE
Can be 0 or 1 indicating which page to move to.
PUnP*
Switches on or off the internal pump. 0 = OFF, 1 = ON
*
These functions will only be displayed and operable if the option has been purchased.

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11.0 PROGRAMME CODES
OL This function returns a two digit code to read and set up the alarm configuration.
The left-hand digit sets whether alarms are high or low. See table below.
DIGIT 1
FUNCTION
ALARM 1
ALARM 2
0
Low
Low
1
High
Low
2
Low
High
3
High
High
The right hand digit sets up whether the alarms are latched or unlatched.
DIGIT 2
FUNCTION
ALARM 1
ALARM 2
0
Unlatched
Unlatched
1
Latched
Unlatched
2
Unlatched
Latched
3
Latched
Latched
With unlatched alarms, the relay and LED will only change over for the duration of the alarm
condition.
For unattended operation it may be required for the operator to know that the analyzer had seen an
alarm condition, even though the measured value was now normal. Latched alarms remain on until
manually or remotely reset. When an alarm is set to Latched the LED will be on when in alarm
condition, should the measured value go into a non-alarm condition, then the LED will flash to show
that it had been in an alarm condition. (Note: the contacts on the relay will remain switched). Simply
pressing the ENTER button will reset the alarm. Also can be remotely reset using a USB Comms
command.
OPHx Where x=1, 2, or 3. The level of oxygen corresponding to the maximum level of the analogue
output may be set in this mode. However, certain restrictions apply to different configurations.
not less than 1%
EC9x0
not less than 10ppm.
EC9x1
EC9x3
not less than 1ppm.
EC95x2