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Related Manuals for ZIROX SGM7
Summary of Contents for ZIROX SGM7
- Page 1 SGM7 OXYGEN MEASURING DEVICE for the determination of oxygen concentrations in inert and reactive gases MANUAL Power supply: 100…240 V, 47…63 Hz ZIROX Sensoren & Elektronik GmbH Am Koppelberg 21, D-17489 Greifswald +49 3834 8309 -00, Fax: -29 E-mail: info@zirox.de...
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Page 3: Table Of Contents
Electrical engineering / electronics........... 12 5.3.1 General data ................ 12 5.3.2 Interface data ............... 12 Composition of the oxygen monitor SGM7 ..........14 General composition ................ 14 6.1.1 General overview ..............14 6.1.2 Construction principle of the solid electrolyte sensor .... 15 6.1.3 Electronic data processing ........... - Page 4 Oxygen Monitor SGM7 Contents 8.3.2 Span gas calibration ............. 27 8.3.3 Calibration status ..............28 Fault clearance ................28 Maintenance, overhaul and storage ............29 General instructions ................. 29 Replacement of the equipment fuse ..........29 10 Appendix ....................31 10.1...
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Page 5: General Information
SGM7 with the aim of making technical improvements, the user is responsible for inserting the additional or updated pages supplied. Proper operation of the SGM7 can only be ensured if the contents of this manual are known. Therefore, all chapters of this manual must be read carefully prior to operating the SGM7. -
Page 6: Commonly Used Symbols
Symbol for proper handling: This symbol appears where the manual refers to the adherence to NOTE rules, instructions and proper operation. In case of disregard damage or destruction of the SGM7 or its single components may result. HB_SGM7_eng.docx... -
Page 7: Application Field
• production processes of electronic components under buffer gas. The introduction of explosive gas compounds, high concentrations of halogens or sulphuric gases (e.g. SO ) into the SGM7 is not permitted. The contact of the SGM7 with siliconic or phosphoric compounds is not permitted either. Functions The SGM7 •... -
Page 8: Safety Regulations
SGM7. • The SGM7 is to be used for the functional operation only (see chapter • The SGM7 is to be installed, operated, and serviced by trained staff only. -
Page 9: Functional Description
O2,meas.gas in the measuring gas in Pa. The sensor of the SGM7 is based on the conductivity of oxide ions in a special ceramic substance (zirconium dioxide) with stabilizing additions. The conductivity of these oxide ions increases exponentially with the temperature and reaches a sufficiently high temperature above 600°C. -
Page 10: General Recommendations
Oxygen Monitor SGM7 4 Functional description In reducing gas compounds, the oxygen partial pressure is inversely proportional to the temperature. For converting the measured value at the measuring temperature into other temperatures special thermodynamic equations are required. Based on the assumption that the total pressures of the gases are almost... -
Page 11: Gas Flow Rate
• The measuring gas must be extracted where a formation of layers can be avoided. • The tube from the measuring point to the SGM7 must be as short as possible in order to avoid a change in the chemical balance in the tube. -
Page 12: Technical Data
Oxygen Monitor SGM7 5 Technical data Technical data Characteristics Description..........Protective gas monitor SGM7 Application ..........Measuring of oxygen concentration in gases Measuring range ........1 vol-ppm…20.6 vol% O , down to 10-20 vol-ppm possible (reducing conditions, see chapter 4.2), up to 100 vol% on request Accuracy at normal pressure .... - Page 13 Oxygen Monitor SGM7 5 Technical data Data bits ........8 Parity ..........None Handshake ........None Pin assignment connector SUB-D 9-pol. F: Chart 1: Serial interface protocol (CR = Carriage Return) Command Display Description M2CR M2x.xxExxCR Oxygen concentration in ppm...
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Page 14: Composition Of The Oxygen Monitor Sgm7
6 Composition of the oxygen monitor SGM7 General composition 6.1.1 General overview The SGM7 is a transportable device. The general composition of the SGM7 is shown in fig. 1. Fig. 1: General composition of the SGM7 The measuring gas gets into the sensor by means of little overpressure at the inlet or the optional pump ingests the measuring gas. -
Page 15: Construction Principle Of The Solid Electrolyte Sensor
A thermocouple (2/5) inside the measuring cell determines the actual electrode temperature. A regulator ensures a constant temperature. The heated measuring cell produces thermal energy. Therefore, the SGM7 must not be covered. HB_SGM7_eng.docx... -
Page 16: Electronic Data Processing
The following block diagram illustrates the data processing. Sensor Sensor Surveillance Amplifier for Amplifier for Thermocouple Cell Voltage Display Keyboard Heater Microcontroller Control DC-Output Relay Outputs RS-232 0.8 A Analog out Pow er Supply 1.0 A 110-230 V/50-60 Hz Fig. 3: Block diagram of the SGM7 HB_SGM7_eng.docx... -
Page 17: Use And Connecting Elements
6 Composition Use and connecting elements 6.2.1 Current supply The SGM7 is firmly connected with the current supply by a connecting cable. 6.2.2 Front The indicators and control elements are located on the front of the SGM7. Depending on the size, the measured values are displayed either in vol% or in vol–ppm (from 1 % in vol%, below that in vol-ppm). -
Page 18: Rear
The gas inlet and outlet, the analog output, the RS232-interface and the power switch are located on the rear panel. The line cord is permanently fixed with the device. It cannot be disconnected. Fig. 5: Rear of the SGM7 HB_SGM7_eng.docx... -
Page 19: Installation And Initiation
A waiting time of about 2 hours before switching-on must be considered. NOTE 1. Install the SGM7 in the favored place (see chapter 7.1). 2. Connect point of measurement and places of gas inlet and outlet of the SGM7. Pay attention to leak-tightness. - Page 20 Silicone can cause measuring inaccuracies because of its oxygen permeability. Therefore, the manufacturer advises against a usage. NOTE The measuring gas can also flow through the SGM7 when it is off. For using Swagelok®-fittings please note the manufacturer’s advice in the appendix of this manual!
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Page 21: Operation And Parametrization
8.1.1 Switch-on and measurement indication When the oxygen monitor is in operating state and all lines are connected according to chapter 7.2, the SGM7 can be switched on. The measuring cell reaches its operating temperature of 750 °C after approx. 10 minutes. The... -
Page 22: Status And Error Messages
Oxygen Monitor SGM7 8 Operation 8.1.4 Status and error messages During the measuring the functions of the measuring cell are Self-check of the SGM7 monitored. In case of faults and/or errors messages are displayed. The relay output is activated simultaneously. -
Page 23: Parametrization
Oxygen Monitor SGM7 8 Operation Parametrization 8.2.1 Adjustable parameters Chart 5: Overview of the adjustable parameters Parameter Range Remarks : 0…21 vol% or in ppm Range up to 100 vol% on Display request 0-20 mA or 4-20 mA Analog output... -
Page 24: Programming Menus
Oxygen Monitor SGM7 8 Operation 8.2.2 Programming menus The keys below the display refer to the following menus (the current meaning of the respective key is shown on the display). A definite parameter can be chosen, changed and finally confirmed with the -key. - Page 25 Oxygen Monitor SGM7 8 Operation B.2 Limit values LIMIT VALUE VALUE: > 206400 ppm 0…999999 ppm resp. 0…99.99 vol% DELAY TIME: 1 sec 0...99 sec RETURN B.3 Output ANALOG OUTPUT VALUE: ppm O vol% O , ppm O [log10] option:O...
- Page 26 Oxygen Monitor SGM7 8 Operation B.4.2 Span gas calibration CALIBR. SPAN GAS MEAS. VALUE: 206400 ppm Current measuring value SPAN GAS: 1000 ppm Adjustable CALIBR. SPAN: WAIT 5 Calibration status CALIBR. VALUE: 1.00 Calibration value RETURN 2 If this line is activated and key Enter is pressed for approx. 3 sec, the calibration value will be set to 1.0!
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Page 27: Calibration
Oxygen Monitor SGM7 8 Operation Calibration For measurements with high accuracy requirements a calibration is highly recommended (The high stability of the measuring cell requires one check- up per a year only!). The device must be in operating state for a minimum of one hour before the calibration! 8.3.1 Zero calibration... -
Page 28: Calibration Status
Oxygen Monitor SGM7 8 Operation 8.3.3 Calibration status Chart 6: Messages calibration status OK (1.5) last calibration OK (calibration value) WAIT ! calibration running BREAK cancelled by pressing key TIME OUT stability not reached within 60sec OUT OF RANGE range exceeded... -
Page 29: Maintenance, Overhaul And Storage
In case of defects in measuring cell or thermocouple, send the SGM7 to the manufacturer for an overhaul. If not in use, the SGM7 has to be stored in the original packing (if possible) storage in a dry, dust-free room. - Page 30 HB_SGM7_eng.docx...
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Page 31: Appendix
(either unheated or electrically heated), for operating in situ in various kinds of combustion installations, technical furnaces, and flames, producing the required signals. Apart from that, ZIROX produces devices with electrically heated sensors for the analysis of externally pre-mixed fuel-air compounds or of siphoned flue gases. - Page 32 Oxygen Monitor SGM7 10 Appendix In combustion processes with air deficiency, sufficiently high temperature and, if necessary, with catalysts for the establishment of complete gas equilibrium, a mixture of nitrogen, hydrogen, water vapor, carbon monoxide and carbon dioxide (the so-called “water gas” which can be produced from coal and water) develops from all organic substances.
- Page 33 Oxygen Monitor SGM7 10 Appendix Gas potentiometry using solid electrolyte sensors Crystals of mixed oxides from ZrO and CaO or Y have vacancies in the oxygen ion sublattices. Oxygen ions can migrate across them at high temperatures. Thus, they are solid electrolytes (i.e. solid ion conductors). At...
- Page 34 Such isothermal cells have been realized very carefully in the ZIROX products. Unlike these, the well-known lambda probes used in automobiles with catalysts in the exhaust tube are not isothermal.
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Page 35: Potentiometric Zro2-Cells For The Measurement Of The H2O/H2
Oxygen Monitor SGM7 10 Appendix unburned part of the used CH vol.-% O 1100 1000 Excess Excess fuel oxygen 750 °C Fuel gas : CH λ 10.2 Potentiometric ZrO2-cells for the measurement of the H2O/H2- ratio The (potentiometric) ZrO -cell delivers a voltage in dependence on oxygen concentration of the test gas. - Page 36 10 Appendix For example: You know the concentration of hydrogen in the measuring gas (e.g. 7 vol%). The ZIROX-device (e.g. SGM) displays the H -ratio of 3.3 x 10 From this it follows a H O concentration of 0.00231 vol% or 23.1 ppm (1 ppm is 10 vol%).
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Page 37: Installation Instructions For Swagelok®-Fittings
Oxygen Monitor SGM7 10 Appendix 10.3 Installation instructions for Swagelok®-fittings HB_SGM7_eng.docx... -
Page 38: Activated Carbon Filter: Description And Application Instructions
Oxygen Monitor SGM7 10 Appendix 10.4 Activated carbon filter: Description and application instructions 10.4.1 Filter construction The figure above shows the carbon filter. Two caps close a tube containing carbon. Both caps are welded into the tube. The Swagelok fittings have stoppers to keep the carbon inside. -
Page 39: Technical Data
Oxygen Monitor SGM7 10 Appendix 10.4.4 Technical data Weight Approx. 285 g Volume Approx. 100 ml Duration of operation Depending on the components and the concentration of the adsorbed organic components, e.g. approx. 1…3 months at raw gas from a fermenting tank (ZKG) Carbon used Granulated or pelletized, 1…3mm... -
Page 40: Eu Declaration Of Conformity
Oxygen Monitor SGM7 10 Appendix 10.5 EU Declaration of conformity HB_SGM7_eng.docx... -
Page 41: Warranty Conditions
Experience has shown that products installed but not in use may be damaged by the process or by external influence. ZIROX will not accept any responsibility for such damage. - Page 42 HB_SGM7_eng.docx...
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Page 43: Your Own Notes And Remarks
Oxygen Monitor SGM7 11 Your notes 11 Your own notes and remarks HB_SGM7_eng.docx...