Operation Manual
OXYNOS® 100
Microprocessor - Controlled
Oxygen - Analyzer
90002955(2) OXYNOS® 100 e [4.10] 21.11.97
2. Edition 11/97
Catalog - No: 90 002 955
Managing The Process Better
Fisher-Rosemount GmbH & Co assumes no liability for any omissions or errors in this manual.
Any liability for direct or indirect damages, which might occur in connection with the deliv ery or the use of
this manual, is expressly e xcluded to the extend permitted by applicable law.
This instrument has left the works in good order according to safety regulations.
T o maintain this operating condition, the user must strictly follow the instructions and consider the warnings
in this manual or provided on the instrument.
Troubleshooting, component replacement and internal adjustments must be made by qualified
service personnel only.
®
The suitability test of OXYNOS
32/1992, RdSchr. d. BMU from J uly 1,1992. The OXYNOS
So the analyzer is suitable f or measuring the concentrations of oxygen according to TI Air , 13
(large furnaces order) and 17
100 (paramagnetic measurement) at “TÜV Ba yern” is reported in GMBl
®
100 was tested at a waste incinerator plant.
th
BlmSchV
th
BlmSchV (incineration).
According to the report No. “95CU054/B” about the approval of “TÜV Nord mbH”, the gas analyzer
®
OXYNOS
(large furnaces order) and 17
100 is suitable for measuring the concentrations of o xygen according to TI Air, 13th BlmSchV
th
BlmSchV (incineration).
According to the report No. “IBS/PFG-No. 41300292” about the approval of “DMT - Gesellschaft für
Forschung und Prüfung mbh, F achstelle für Sicherheit - Prüfstelle für Grubenbewetterung”, the stationary
®
gas analyzer OXYNOS
between 0 and 10 % O
100 is suitable for (paramagnetic) measuring the concentrations of oxygen
. The system control with serial interf aces as described in this operation manual
2
have not been subject to the DMT - approval.
Misprints and alterations reserved
©
1996-97 by FISHER-ROSEMOUNT GmbH & Co. (RAE)
1. Edition: 07/96
2. Edition: 11/97
Read this operation manual carefully before attempting to operate the analyzer !
For expedient handling of reports of defects , please include the model and serial number which
can be read on the instrument identity plate.
Look for the error check list please too (see Item 29. of this manual)
Fisher - Rosemount GmbH & Co.
Industriestrasse 1
D - 63594 Hasselroth
Phone + 49 60 55 / 884 - 0
Telefax + 49 60 55 / 884 - 209
90002955(2) OXYNOS® 100 e [4.10] 21.11.97
CONTENTS
CONTENTS
INTRODUCTION E - 1
SAFETY SUMMARY S - 1
General S - 1
Gases and Gas Conditionning (Sample Handling) S - 2
Supply Voltage S - 3
Connection Cables S - 3
Electrostatic Discharge S - 4
Operating Conditions according to DMT - Approval S - 5
TECHNICAL DESCRIPTION
1. Setup 1 - 1
1.1 Front Panel 1 - 1
1.2 Rear Panel 1 - 2
1.3 Inside View 1 - 2
2. Open
3. Measuring Principle 3 - 1
3.1 Paramagnetic Measurement 3 - 1
3.2 Electrochemical Measurement 3 - 3
4. Main Features 4 - 1
90002955(2) OXYNOS® 100 e [4.10] 21.11.97
I
CONTENTS
OPERATION
5. Preparation 5 - 1
5.1 Installation 5 - 1
5.2 Gas Conditionning (Sample Handling) 5 - 2
5.2.1 Gas Flow Rate 5 - 2
5.3 Gas Connections 5 - 3
6. Switching On 6 - 1
6.1 Battery Operation 6 - 1
6.2 Power Supply Operation 6 - 2
7. Key Functions 7 - 1
7.1 FUNCTION 7 - 2
7.2 ENTER 7 - 3
7.3 INPUT - CONTROL 7 - 5
8. Entry of System Parameters 8 - 1
8.1 Pressure Correction 8 - 2
8.2 Hold 8 - 2
8.3 Automatic Calibration 8 - 3
8.4 Tolerance Check 8 - 3
8.5 Display Off 8 - 4
8.6 Analog Signal Outputs 8 - 4
8.7 Flushing Period 8 - 6
8.8 User Code 8 - 6
8.9 Response Time (t90) 8 - 7
8.10 Offset (Begin of range) 8 - 8
8.11 End of Range Value 8 - 9
8.12 Reset 8 - 10
8.13 Program Version 8 - 11
8.14 Serial - No. 8 - 11
8.15 Copy - No. 8 - 11
8.16 Absorber 8 - 12
II
90002955(2) OXYNOS® 100 e [4.10] 21.11.97
CONTENTS
9. Calibration 9 - 1
9.1 Manual Calibration 9 - 2
9.1.1 Zeroing 9 - 2
9.1.2 Spanning 9 - 4
9.2 Automatic Calibration Mode (Option) 9 - 7
9.2.1 Zeroing 9 - 7
9.2.2 Combined Zeroing and Spanning 9 - 9
10. Digital Outputs 10 - 1
10.1 Concentration Limits 10 - 2
10.2 Valve Control 10 - 4
10.3 Status Signals (Option) 10 - 4
11. Measurement / Switching Off 11 - 1
11.1 Measurement 11 - 1
11.2 Switching Off 11 - 2
12. Serial Interface (Option) 12 - 1
12.1 Retrofitting of Serial Interface / Status Signals 12 - 1
12.2 General 12 - 2
12.3 Start Up 12 - 4
12.3.1 RS 232 C 12 - 5
12.3.2 RS 485 12 - 5
12.3.3 Switching ON/OFF Interface Operation 12 - 6
12.3.4 Setting Interface Parameters 12 - 6
12.4 Telegram Syntax 12 - 8
12.4.1 Start Character ( “$” = Hex 24) 12 - 8
12.4.2 Terminate Character ( “CR” = Hex OD) 12 - 8
12.4.3 Instruction Code 12 - 8
12.4.4 Hyphen Character ( “;” = Hex 3B) 12 - 8
12.4.5 Status Telegram 12 - 9
12.4.6 Numerical Representations 12 - 10
12.4.7 Block Parity Check 12 - 10
12.5 Instruction Syntax 12 - 11
12.5.1 Instruction Listing 12 - 12
12.5.2 Response Telegrams 12 - 13
90002955(2) OXYNOS® 100 e [4.10] 21.11.97
III
CONTENTS
TROUBLESHOOTING
13. Error List 13 - 1
14. Measuring Points of BKS and OXS 14 - 1
14.1 Measuring points of BKS 14 - 1
14.1.1 Supply Voltage + 6 V 14 - 1
14.1.2 Reference Voltage positive 14 - 1
14.1.3 Reference Voltage negative 14 - 2
14.1.4 Temperature Sensor 14 - 2
14.1.5 Analog Preamplifiering 14 - 2
14.1.6 Light Barrier Signal (Simulation) 14 - 3
14.2 Measuring points of OXS (electrochemical measurement) 14 - 4
14.2.1 Sensor Signal 14 - 4
15. Plug Pin Allocation of BKS and OXS 15 - 1
15.1 Plug Pin Allocation of BKS 15 - 1
15.2 Plug Pin Allocation OXS (electrochemical measurement only) 15 - 2
16. Jumper Allocation of BKS 16 - 1
17. Open
IV
90002955(2) OXYNOS® 100 e [4.10] 21.11.97
CONTENTS
MAINTENANCE 18 - 1
20. Leak Testing 20 - 1
21. Opening of the Housing 21 - 1
22. Open
23. Check and Replacement of the electrochemical Sensors 23 - 1
23.1 Check of the Sensors 23 - 2
23.2 Replacement of the Sensors 23 - 3
23.2.1 Removal of the Sensors 23 - 3
23.2.2 Exchange of the Sensors 23 - 4
23.2.3 Reinstalling of the Sensors 23 - 5
23.2.4 Basic conditions for the electrochemical Sensor 23 - 6
90002955(2) OXYNOS® 100 e [4.10] 21.11.97
V
CONTENTS
TECHNICAL DATA 24 - 1
24.1 Voltage Supply 24 - 4
24.1.1 Electrical Safety 24 - 4
24.1.2 Power Supply 24 - 4
SUPPLEMENT
25. Replacing the EPROM 25 - 1
26. Pin - Assignments 26 - 1
27. Connection Cable 27 - 1
28. Open
29. Failure Check List 29 - 1
INDEX R - 1
List of Figures R - 6
VI
90002955(2) OXYNOS® 100 e [4.10] 21.11.97
Safety Summary
In this manual we hav e used the following safety symbols
to draw y our attention to strictly f ollow these instructions !
1. General
SAFETY SUMMARY
GENERAL
◆ The following general saf ety precautions must be observed during all phases of operation,
service and repair of this instrument !
Failure to comply with these precautions or with specific w arnings elsewhere in this manual
violates safety standards of design, manuf acture and intended use of this instrument !
Failure to comply with these precautions may lead to personal injury and damage to this
instrument !
◆ Fisher-Rosemount GmbH & Co. assume no liability for the customer´s failure to comply with
these requirements !
◆ Do not attempt internal service or adjustment unless other person, capable of rendering first
aid and resuscitation, is present !
◆ Because of the danger of introducing additional hazards, do not perform any unauthorized
modification to the instrument !
Return the instrument to a Fisher-Rosemount Sales and Service office for service or repair
to ensure that safety f eatures are maintained !
◆ Operating personnel must not remove instrument covers !
Component replacement and internal adjustments must be made by qualified service
personnel only !
◆ Instruments which appear damaged or defective should be made inoperative and secured
against unintended operation until they can be repaired by qualified service personnel.
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
S - 1
SAFETY SUMMARY
GENERAL / GASES AND GAS CONNECTIONS
Read this operation manual carefully before attempting to operate with the
instrument !
Do not operate the instrument in the presence of flammable gases, explosive
atmosphere or furnes without supplementary protective measures !
The installation site for the instrument has to be dry and remain above freezing
point at all times.
The instrument must be exposed neither to direct sunlight nor to strong sources
of heat. Be sure to observe the permissible ambient temperature !
For outdoor sites, we recommend to install the instrument in a protective cabinet.
At least, the instrument has to be protected against rain (e.g., shelter).
Due to the high temperatures of photometer or heated components there is a
danger of burns to the operators.
2. Gases and Gas Conditionning (Sample Handling)
Do not interchange gas inlets and gas outlets !
All gases have to be supplied to the system as conditionned gases !
When the instrument is used with corrosive gases, it is to be verified that there
are no gas components which may damage the gas path components.
The exhaust gas lines have to be mounted in a declining, descending,
pressureless and frost-free and according to the valid emission legislation !
Be sure to observe the safety regulations for the respective gases
(sample gas and test gases / span gases) and the gas bottles !
S - 2
Inflammable or explosiv e gas mixtures must not be purged into the instrument
without supplementary protective measures !
To avoid a danger to the operators by explosive, toxic or unhealthy gas
components, first purge the gas lines with ambient air or nitrogen (N2) before
cleaning or exchange parts of the gas paths.
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
SAFETY SUMMARY
SUPPLY VOLTAGE
3. Supply Voltage
◆ Verify correct polarity for 24 V DC - operation !
◆ This product is a Safety Class 1 instrument (provided with a protective earth terminal).
To prevent shock hazard, the instrument chassis and cabinet must be connected to an
electrical ground. The instrument must be connected to the AC power supply mains through
a three-conductor power cable , with the third wire firmly connected to an electrical ground
(safety ground) at the po wer outlet. If the instrument is to be energized via an external power
supply, that goes for the po wer supply too.
Any interruption of the protective (grounding) conductor or disconnection of the protectiv e
earth terminal will cause a potential shock hazard that could result in personal injury.
Deliberate disconnection is inadmissible / prohibited !
◆ Use only power supply VSE 2000 or equivalent po wer supplys to be in agreement with the
CE - conformity.
◆ In case of exchanging fuses the customer has to be certain that fuses of specified type and
rated current are used. It is prohibited to use repaired fuses or def ective fuse holders or to
short-circuit fuse carriers (fire hazard).
◆ Always disconnect power, discharge circuits and remov e external voltage sources before
troubleshooting, repair or replacement of any component !
Any work inside the instrument without switching off the power must be
performed by a specialist, who is familiar with the related danger, only !
4. Connection Cables
◆ Use only from our factory optional delivered cables or equivalent shielded cables to be in
agreement with the CE - conformity.
The customer has to guarantee, that the shield is be connected bothsided.
◆ By using of optional delivering terminal strip adapters the analyzer is not be in agreement
with the CE - conformity. In this case CE - conformity is to be declared by customer as
“manufacturer of system”.
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
S - 3
SAFETY SUMMARY
ELECTROSTATIC DISCHARGE
5. Electrostatic Discharge
The electronic parts of the analyzer can be irreparably damaged if exposed to electrostatic
discharge (ESD).
The instrument is ESD protected when the covers have been secured and safety precautions
observed. When the housing is open, the internal components are not ESD protected anymore.
Although the electronic parts are reasonably safe to handle, you should be aw are of the following
considerations:
Best ESD example is when you walk ed across a carpet and then touched an electrically grounded
metal doorknob. The tiny spark which has jumped is the result of electrostatic discharge (ESD).
You prevent ESD by doing the following:
Remove the charge from your body before opening the housing and maintain during work with
opened housing, that no electrostatic charge can be built up.
Ideally you are opening the housing and working at an ESD - protecting workstation.
Here you can wear a wrist trap.
However, if you do not have such a workstation, be sure to do the following procedure exactly:
Discharge the electric charge from your body. Do this by touching a device that is electrically
grounded (any device that has a three - prong plug is electrically grounded when it is plugged into
a power receptacle).
This should be done several times during the operation with opened housing (especially after
leaving the service site because the movement on a low conducting floors or in the air might cause
additional ESDs).
S - 4
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
SAFETY SUMMARY
OPERATING CONDITIONS ACCORDING TO DMT - APPROVAL
6. Operating Conditions according to DMT - Approval
(Chapter 6 of the supplement I to the DMT - report No. “IBS/PFG-No. 41300292” about the
®
performance test of the stationary gas analyzer OXYNOS
100.
According to the system version and measuring results included in this report, the stationary gas
analyzer O XYNOS® 100 (paramagnetic measurement) from Rosemount GmbH & Co. is suitable
for measuring the concentrations of oxygen between 0 and 10 % O2, if the features and system
version go conform with the details contained in the enclosed documents as stated in this report,
if the analysis system is operated accordingly and if the following requirements are met:
◆ When using the gas warning system, it must be ensured that the permissible variations
(admissible error limit) will not be exceeded, taking into account the systematics f ailures of
the measuring signals (as indicated in this report) and the local operating conditions.
Consider the Code of Pratice No. T032 of the Labor Association of the Chemical Industry
"Usage of stationary gas warning systems for explosion protection".
◆ Verify that the explosion protection requirements are met when using the gas warning
system.
◆ Depending on the situation, it must be verified that the preset values are low enough to allo w
the system to activate the necessary protection and emergency measures and, thus, to
prev ent an y critical situations in a minimum period of time.
◆ The operatability of the alarms and the displays of each system should be tested with clean
air and test gas after the initial operation, after each long-time interruption, and periodically .
The tightness of gas pathes should also be tested. The tests must be documented by
keeping accounts.
◆ The intervals for the periodical tests must be settled by the person being responsible f or the
system´s security and in accordance with the Code of Pratice No. T023 of the Labor
Association of the Chemical Industry "Maintenance of stationary gas warning systems for
explosion protection".
◆ The system control with serial interfaces described in this operation manual have not been
subject to this investigation.
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
S - 5
SAFETY SUMMARY
OPERATING CONDITIONS ACCORDING TO DMT - APPROVAL
◆ Sample gas condensation in oxygen analyz er (components) must be prevented by taking
the necessary steps (oxygen cell is thermostated).
◆ When the system is used with aggressive gases, it is to be verified that there are no gas
components which might damage the gas path components.
◆ Appropriate dust filters must precede the used systems.
◆ The pressure and flow values recommended by the manuf acturer should be observed. An
external monitoring of the sample gas flow through the analyzer should be provided.
◆ The results of this investigation are based on the sanalyzers using software v ersions "3.03"
and "4.00" and "4.01". A change of the software version used must be certified by the T esting
Association.
◆ It should be ensured that the system parameters for the analog output hav e been correctly
adjusted. End of range of low concentration should not be identical or low er than the begin
of range. Disregarding these versions, the measurement range should be adjusted between
0 and 10 % O2 when the systems are used for explosion protection.
◆ Read and follow the operation and maintenance manual supplied to and certified by PFG.
It is important that the temperature is kept between + 5°C and + 45 °C.
◆ The analyzer housings must be provided with a permanent type plate indicating the name
of the manufacturer , model number , serial number, and the f ollowing ref erence and date of
testing:
"IBS/PFG-Nr. 41300292"
Other designation requirements, such as these according to ElexV, are still valid. With this
type plate, the manuf acturer conforms that the features and technical data of the deliv ered
system are identical with those described in this report. Any system which is not provided
with such a type plate does not go conform with this report.
S - 6
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
SAFETY SUMMARY
OPERATING CONDITIONS ACCORDING TO DMT - APPROVAL
◆ The chapter 6 of this report must be included in the operation and maintenance manual.
◆ The manufacturer has to supply the customer with a cop y of this report, if required.
◆ A print of the report in an abridged version requires the agreement of PFG.
◆ The results included in this report may not be altered in publications produced by the
manufacturer.
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
S - 7
SAFETY SUMMARY
S - 8
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
INTRODUCTION
Introduction
The OXYNOS® 100 gas analyzer is a member of the 100 series of our gas analyzers program.
It is designed for the continuous monitoring of oxygen concentrations.
The compactness of the OXYNOS® 100 permits its use in a wide variety of applications in industry
and research. Energy conservation, occupational safety, and quality assurance are the major
areas addressed.
Some typical specific applications are:
❏ Flue gas analyses for combustion efficiency in firing systems, gas cleaning systems
and legislation compliance
❏ Analysing landfill gas for ex protection
❏ Monitoring metallurgical processes in metals refining and processing
❏ Monitoring fermentation and sewages processes in biotechnology
❏ Motor vehicle exhaust gas analyses (Internal Combustion Engine Emissions)
❏ Air quality monitoring (vehicular tunnel, gas production, personal protection)
❏ Food industry
❏ Universities and Research Institutes
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
E - 1
INTRODUCTION
The analyzers of the O XYNOS® 100 series are complete, ready - to - use, gas analyzers which
may be directly inserted into existing or planned gas lines.
Since OXYNOS® 100 is working according to the extractive measuring method an adequate
sample handling system has to be provided.
The analyzer is microprocessor controlled.
Programming available with use of optional, external solenoid valves permit fully automatic
calibration of the analyzer.
All inputs required may be activated by a host computer via an optional serial interface
(RS 232 C / 485), for networking applications.
Note:
Read this operation manual carefully before attempting to operate the analyzer !
For single - channel analyzers:
The display, entries and error messages for the second channel described
in this manual are inapplicable.
E - 2
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
SETUP
FRONT PANEL
1. Setup
The analyzer it incorporated in a 1/4 19" rack-mounting housing, 3 height units.
The optional table-top housing is fitted with a carrying strap and rubber feets additional.
1.1 Front Panel
The front panel (see Fig. A-1) includes the LED - displays and all of the analyzer operating controls.
90002955(2) OXYNOS® 100 e [4.10] 21.11.97
1 - 1
SETUP
REAR PANEL
1.2 Rear Panel
The rear panel (Fig. A-2) includes
❏ the gas line fittings
❏ the plug for the electrical supply input
❏ the sub-miniature “D” mating socket for the analog signal outputs
❏ the sub-miniature “D” plug f or the digital outputs (concentration limits and valve control)
❏ optionally the sub-miniature “D” mating socket for the RS 232 C / 485 - interface
❏ optionally the sub-miniature “D” plug for the status signals (relay outputs)
1.3 Inside View
The inside view is shown in Fig. 1-1 a and Fig 1-1 b.
1 - 2
90002955(2) OXYNOS® 100 e [4.10] 21.11.97
Gas line fittings
SETUP
INSIDE VIEW
Security dust filter
Heat exchanger
Inlet
to Sensor
from Sensor
PCB BKS 01
Outlet
View "X"
Heat exchanger
O2 - Sensor
Fig. 1-1a: OXYNOS® 100, Inside View with paramagnetic sensor
90002955(2) OXYNOS® 100 e [4.10] 21.11.97
Pressure sensor
(Option)
Front panel
1 - 3
SETUP
INSIDE VIEW
Gas line fittings
channel 2 channel 1
Security dust filter
Pressure sensor
(Option)
1 - 4
Front panel
Fig. 1-1b: OXYNOS® 100, Inside view with electrochemical sensor
90002955(2) OXYNOS® 100 e [4.10] 21.11.97
MEASURING PRINCIPLE
PARAMAGNTIC OXYGEN MEASUREMENT
3. Measuring Principle
Depending on analyzer model different measuring methods will be used.
The installed type of oxygen sensor is to identify at the channel code (see Fig. A.1).
% O2 para. = paramagnetic Sensor
% O2 chem. = electrochemical Sensor
3.1 Paramagnetic Measurement
The determination of O2 - concentration is based on the paramagnetic principle (magnetomechanic principle).
T wo nitrogen-filled (N2 is diamagnetic) quartz spheres are arranged in a "dumbbell" configuration
and suspended free to rotate on a thin platinum ribbon in a cell.
A small mirror that reflects a light beam coming from a light source to a photodetector, is mounted
on this ribbon. A strong permanent magnet especially shaped to produce a strong highly inhomogeneous magnetic field inside the analysis cell, is mounted outside the wall.
When oxygen molecules enter the cell, their paramagnetism will cause them to be drawn to wards
the region of greatest magnetic field strength. The O2 - molecules thus ex ert different forces which
produce a torque acting on the sphere arrangement, and the suspended “dumbbell”, along with
the mirror mounted on its suspension ribbon, will be angulary rotated away from the equilibrium
position.
The mirror then will deflect an incident light beam onto the photodetector which itself produces an
electric voltage. The electric signal is amplified and fed back to a conducting coil at the “dumbbell”,
forcing the suspended spheres back to the equilibrium position.
The current required to generate the restoring torque to return the “dumbbell” to its equilibrium
position is a direct measure of the O2 - concentration in the gas mixture.
The complete analysis cell consists of analysis chamber, permanent magnet, processing
electronics, and a temperature sensor . The sensor itself is thermostatted up to approx. 55 °C. For
warming up the measuring gas is conducted via a heat-exchanger.
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
3 - 1
MEASURING PRINCIPLE
PARAMAGNTIC OXYGEN MEASUREMENT
3 - 2
Fig. 3-1: Principle Construction of paramagnetic Analysis Cell
1 Permanent magnet
2 Platinum wire
3 Mirror
4 Quartz spheres
5 Wire loop
6 Photodetector
7 Light source
8 Amplifier
9 Display
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
MEASURING PRINCIPLE
ELECTROCHEMICAL OXYGEN MEASUREMENT
3.2 Electrochemical Measurement
The determination of O2 - concentrations is based on the principle of a galvanic cell.
The principle structure of the oxygen sensor is shown in Fig. 3-2.
Lead wire (Anode)
Lead wire (Cathode)
Anode
O - ring (8)
Plastic disc (9)
Plastic top (10)
(1)
(Lead)
(Black)
Thermistor (5)
Acid electrolyte (3)
Sponge disc (7)
Cathode
(2)
Teflon membrane (4)
(Red)
Resistor (6)
(Gold film)
Fig. 3-2: Structure of electrochemical Oxygen Sensor
The oxygen senor incorporate a lead/gold oxygen cell with a lead anode (1) and a gold cathode
(2), using a specific acid electrolyte. T o avoide moisture losses at the gold electrode a sponge sheet
is inserted on the purged side.
Oxygen molecules diffuse through a non-porous T eflon membrane (4) into the electrochemical cell
and are reduced at the gold-cathode. Water results from this reaction.
On the anode lead oxide is formed which is transferred into the electrolyte. The lead anode is
regenerated continuously and the electrode potential therefore remains unchanged for a long
time.
The rate of diffusion and so the response time (t90) of the sensor is dependent on the thickness
of the Teflon membrane.
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
3 - 3
MEASURING PRINCIPLE
ELECTROCHEMICAL OXYGEN MEASUREMENT
(Red) (Black)
Thermistor (5)
(-)
Gold-
Cathode (2)
O2 + 4 H+ + 4 e- → 2 H2O
Summary reaktion O
(11)
Resistor (6)
Electrolyte (3)
(ph 6)
+ 2 Pb → 2 PbO
2
2 Pb + 2 H2O → 2 PbO + 4 H+ + 4 e
Fig. 3-3: Reaction of galvanic cell
(+)
Lead-
Anode (1)
-
The electric current between the electrodes is propor tional to the O2 concentration in the gas
mixture to be measured. The signals are measured as terminal voltages of the resistor (6) and the
thermistor (5) for temperature compensation.
The change in output voltages (mV) of the senor (11) represents the o xygen concentration.
3 - 4
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
MAIN FEATURES
4. Main Features
◆ 1/4 19" housing, 3 HU
◆ 2 parallel measuring channels possible for electrochemical sensors
◆ 4 - digit LED - measuring value display and operators prompting via this displays for each
measuring channel
◆ The response time (t90 - time) can be adjusted separately for each measuring channel
◆ Plausibility checks
◆ Temperature compensations
◆ Analog signal outputs [0 (2) - 10 V {Option 0 (0,2) - 1 V} / 0 (4) - 20 mA], optically isolated
◆ Monitoring of two free adjustable concentration limits for each measuring channel
(max. 30 V DC / 30 mA, “Open Collector”, optically isolated)
◆ Automatic calibration using zeroing and spanning at preselected intervals
(external solenoid valv es are required for this)
◆ RS 232 C/485 serial interface for data intercommunications with external
computers (optional)
◆ Status signals as option
(Non-voltage-carrying contacts, max. 42 V / 1 A)
◆ Self - diagnostic procedures, plus maintenance and servicing support functions
◆ Operator prompting for the av oidance of operator errors
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
4 - 1
MAIN FEATURES
4 - 2
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
PREPARATION
INSTALLATION SITE
5. Preparation
Please check the packing and its contents immediately upon arrival.
If any damage or missing items are found, then we request that you notify the forwarder to
undertake a damage surve y and report the loss or damage to us immediately.
5.1 Installation
The analyzer must not operate in explosive atmosphere without supplementary protective
measures !
The installation site for the analyzer has to be dry and remain above freezing point at all times.
The analyzer must be exposed neither to direct sunlight nor to strong sources of heat.
The permissible ambient temperature are between + 5 °C and + 45 °C for paramagnetic
measurement and + 5 °C and + 40 °C for electrochemical measurement.
For outdoor installation, we recommend to install the analyzer in a protectiv e cabinet. At least, the
analyzer has to be protected against rain (e.g., shelter).
The analyzer has to be installed as near as possible to the sample point, in order to av oid low
response time caused by long sample gas lines.
In order to decrease the response time, a sample gas pump with a matching high pumping rate
may be used. Ev entually, the analyzer has to be operated in the bypass mode or b y an ov erflow
valve to prevent too high flow and too high pressure (Fig. 5-1).
Exhaust
Bypass valve
Gas sampling pump
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
Analyzer
Flow meter
Filter
Fig. 5-1: OXYNOS® 100, Bypass installation
Exhaust
5 - 1
PREPARATION
GAS CONDITIONNING (SAMPLE HANDLING)
5.2 Gas Conditionning (Sample Handling)
The conditionning of the sample gas is of greatest importance for the successful operation of any
analyzer according to extractiv e method.
Only conditionned gas has to be supplied to the analyzer !
The gas has to fullfil the following conditions:
It must be
❏ free of condensable constituents
❏ free of dust
❏ free of aggressive constituents which are not compatible with the material of the gas
paths.
❏ have temperatures and pressures which are within the specifications stated in “Technical
Data” of this manual.
Inflammable or explosive gas mixtures may not be intr oduced into the analyzer
without supplementary protective measures !
When analysing vapours, the dewpoint of the sample gas has to be at least 10 °C below the
ambient temperature in order to avoid the precipitation of condensate in the gas paths .
Suitable gas conditionning hardware may be supplied or recommended for specific analytical
problems and operating conditions.
5.2.1 Gas Flow Rate
The gas flow rate should be within the range 0.2 l/min to maxi. 1.5 l/min for electrochemical
measurement and 0.2 l/min to maxi. 1.0 l/min for paramagnetic measurement !
The gas flow rate for paramagnetic measurement is allo wed to maxi. 1 l/min. !
5 - 2
90002955(1) OXYNOS® 100 e [4.01] 01.07.96
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