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Related Manuals for ZIROX SGM7.2
Summary of Contents for ZIROX SGM7.2
- Page 1 ZIROX ® -Oxygen Measuring Systems SGM7.2 Oxygen measuring device for inert and reactive gases Manual ZIROX Sensoren & Elektronik GmbH Greifswald Am Koppelberg 21, D-17489 Greifswald ++49 3834 8309 -00, Fax: -29 e-mail: info@zirox.de...
- Page 2 SGM7.2 Manual Oxygen measuring device for the determination of oxygen concentrations in inert and reactive gases Range: 2 · 10 ... 10 Vol.-ppm Power supply: 100…240 V, 47…63 Hz HB_SGM72_Rehm_eng.DOC...
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Page 3: Table Of Contents
Mechanical data................12 Electrical engineering/electronics ............. 12 5.3.1 General data ................. 12 Interface data ..................13 Construction of the Oxygen Monitor SGM7.2 .......... 15 Principle construction................ 15 6.1.1 General overview ..............15 6.1.2 Construction principle of the solid electrolyte sensor .... 15 6.1.3... - Page 4 Oxygen Monitor SGM7.2 Contents 8.3.2 Span Gas Calibration............28 8.3.3 Calibration state ..............29 Trouble Shooting................29 Maintenance, overhaul and storage............30 General Hints ..................30 Replace the equipment fuse ............. 30 10 Anhang......................31 10.1 Fundamentals of the use of potentiometric ZrO2 solid electrolyte sensors for the optimal guidance of combustion processes ......
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Page 5: General Information
SGM7.2. This operation manual is not subject to the amendment service. If the manufacturer modifies the SGM7.2 with the aim of making technical improvements the user is responsible to insert the additional or updated pages supplied. -
Page 6: Safety Symbols And Terms
Degree and intensity of the damage depend on the triggering actions and the behavior of the persons involved. Disregard of these hints may result in damage to or destruction of the entire SGM7.2 or single components, other property, as well as minor injuries. Symbol for proper usage This symbol can be found where the observance of instructions, regulations, and proper order of actions/events is important. -
Page 7: Application Field
The SGM7.2 is a modification of the SGM7 for using in soldering applications. The main application area of the SGM7.2 is the monitoring of technical protecting gases. The introduction of explosive gas mixtures, high concentrations of halogens or sulphuric gases (e.g. -
Page 8: Safety Regulations
(see chapter 2). • The SGM7.2 may only be installed, operated, and maintained by trained staff. • In any case, the SGM7.2 must be connected to the main supply with a socket with earth connection by the supplied cable. -
Page 9: Functional Description
– partial pressure of the oxygen at the measuring electrode O2,meas.gas in the measured gas in Pa. The sensor of the SGM7.2 is based on the conductivity of oxide ions in a special ceramic substance (zirconium dioxide) with stabilising additives. The conductivity of these oxide ions increases exponentially with the temperature and it is sufficiently high for temperatures above 600°C. -
Page 10: General Recommendations
Oxygen Monitor SGM7.2 4 Functional Description Based on the assumption that the total pressures of the Equation for Oxygen gases are almost the same at both electrodes (in this case Concentrati the volume concentrations may be used in the calculation... -
Page 11: Gas Flow Quantity
• The measuring gas must be taken from a location where the measuring gas has a homogeneous concentration of its substances. • The pipe from the measuring point to the SGM7.2 must be as short as possible in order to avoid a change in the chemical balance in the pipe. -
Page 12: Technical Data
Oxygen Monitor SGM7.2 5 Technical Data Technical Data Characteristics Description ..........Protective gas monitor SGM7.2 Application..........Measuring of the oxygen concentration in gases Measuring range ........1 Vol.-ppm…20.6 Vol.-% O , down to 10-20 Vol.- ppm possible (reducing conditions, see chap. 4.2), up to 100 Vol.-% on request... -
Page 13: Interface Data
Oxygen Monitor SGM7.2 5 Technical Data Interface data Serial Interface RS-232 Transfer rate ........max. 19200 Baud, adjustable Stop bits ......... 1 Data bits......... 8 Parity..........none Handshake........without Pin-Configuration Connector SUB-D 9-pol. F: Table 1: Serial Interface Protocol (CR = Carriage Return) - Page 14 Oxygen Monitor SGM7.2 5 Technical Data 5.4.1 Pump Controlling A more powerful pump is integrated at the SGM7.2. It can be also controlled via RS232: Table 4: pump controlling via RS232 Command from PC Answer of SGM7.2 Remark P0CR P0CR...
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Page 15: Construction Of The Oxygen Monitor Sgm7.2
Principle construction 6.1.1 General overview The SGM7.2 is a transportable device. The in principle structure of the SGM7.2 shows Figure 3. Fig. 1: Principle construction of the SGM7.2 The measuring gas get into the sensor due to little overpressure at the inlet or an optional pump ingests the measuring gas. - Page 16 A thermocouple (2/5) inside the measuring cell determines the actual electrode temperature. A heater control assures a constant temperature. The heated measuring cell produces warmth energy. Therefore the SGM7.2 must not covered. HB_SGM72_Rehm_eng.DOC...
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Page 17: Electronic Measured-Value 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 circuit diagram of the SGM7.2 HB_SGM72_Rehm_eng.DOC... -
Page 18: Using And Connection Elements
6 Construction Using and connection elements 6.2.1 Power supply The SGM7.2 will be connected to the power supply by securely attached line cord. Front side The indication and operating devices are at the front of the SGM7.2. Depending on the size the measured values are shown either in vol -% or in vol -ppm on a display. -
Page 19: Rear Side
The gas inlet is connected with the charcoal filter. The inlet of the filter is located at the front side. The line cord is attached to the device. It can not be disconnected. Fig. 5: Rear side of the SGM7.2 HB_SGM72_Rehm_eng.DOC... -
Page 20: Placement And Putting Into Operation
Setting up of the operating state If the SGM7.2 has been brought from a cold place to a place of operation with higher temperature or relative humidity a waiting period of at least two hours should be attended before switching on the SGM7.2, in order to compensate the temperature... - Page 21 Silicon can cause measuring inaccuracies because of it’s oxygen permeability. Therefore the manufacturer does not advise a using. The measuring gas can also flow through the SGM7.2 when it’s turned off. For Using Swagelok®-Fittings please note the hints at the attachment of this manual! HB_SGM72_Rehm_eng.DOC...
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Page 22: Operation And Parameter Setting
After switch on the SGM7.2 is in the measuring modus. On the display the current, for output 1 programmed measuring value is shown (normally the oxygen concentration, accordant the chosen dimension). -
Page 23: Status And Error Messages
Oxygen Monitor SGM7.2 8 Operation 8.1.4 Status and error messages During the measuring the functions of the measuring cell will be Own check of the SGM7.2 monitored. In the disturbance-/ fault case error messages are issued. The relay output will be activated simultaneously. -
Page 24: Parameter Setting
Oxygen Monitor SGM7.2 8 Operation Parameter Setting 8.2.1 Adjustable Parameter Table 7: 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 25: Programming Menus
Oxygen Monitor SGM7.2 8 Operation 8.2.2 Programming menus The following menus are attainable over the buttons under the display (the current meaning of the buttons is shown on the display respectively). There always a definite parameter can be made adjustable by the -key. - Page 26 Oxygen Monitor SGM7.2 8 Operation B.2 Limit Values LIMIT VALUE VALUE: > 206400 ppm 0…999999 ppm resp. 0…99,99 Vol.-% DELAY TIME: 0...99s RETURN B.3 Output ANALOG OUTPUT VALUE: ppm O2 Vol% O2, ppm O2, O2[log10] Option:O2 NGW, H20/H2 RANGE: 4-20 mA...
- Page 27 Oxygen Monitor SGM7.2 8 Operation B.4.2 Span Gas Calibration CALIBR. SPAN GAS MEAS. VALUE: 206400 ppm actual measuring value SPAN GAS: 1000 ppm adjustable CALIBR. SPAN: WAIT 5 Calibration state CALIBR. VALUE: 1.00 Calibration value RETURN 2 If this line has been activated and key Enter has been pressed for approx. 3s the calibration value will be set as 1.0!
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Page 28: Calibration
„YES“. 8.3.2 Span Gas Calibration For this the SGM7.2 must be flowed through by certified span gas (oxygen concentration near later measuring conditions). First “Calibration” and than “CALIBR. SPAN GAS” will be selected via keyboard. -
Page 29: Calibration State
Oxygen Monitor SGM7.2 8 Operation 8.3.3 Calibration state Table 8: Messages calibration state OK (1.5) last calibration OK (calibration value) WAIT ! calibration is running BREAK cancelled by key pressing TIME OUT stability has not been reached in 60s OUT OF RANGE... -
Page 30: Maintenance, Overhaul And Storage
At defects at the measuring cell or at the thermocouple the SGM7.2 has to be sent in to the manufacturer to the overhaul. If not using the SGM7.2 has to be stored in the original packing (if storage possible) in a dry, dust-free room. -
Page 31: Anhang
Apart from that, ZIROX also produces devices with electrically heated sensors for the analysis of externally pre-mixed fuel-air mixtures or of siphoned flue gases. - Page 32 Oxygen Monitor SGM7.2 10 Attachment hydrogen, water vapour, carbon-monoxide and carbon dioxide (the so-called ”water gas”, which can be produced from coal and water) is obtained. The reaction formula for air-deficient combustion can not be described merely by the parameters λ, n and m. Rather, the following equation applies : + [(1-a/2) ⋅...
- Page 33 Oxygen Monitor SGM7.2 10 Attachment platinum layers on ceramic bodies of stabilized ZrO (stabilized against breaking), electrode reactions with the oxygen ion vacancies V are possible : (solid electrolyte) = O 1/2 O (gas) + 2 e (platinum) + V...
- Page 34 The cell voltages calculated with the above-mentioned equations and presented in the diagram are only valid for isotherm cells, with equal temperature at both electrodes. Such isotherm cells have been realized very carefully in the ZIROX products. Unlike these, the well-known lambda probes used in cars with catalysts in the exhaust pipe, are not isotherm.
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Page 35: Mounting Hints For Swagelok -Fittings
Oxygen Monitor SGM7.2 10 Attachment ® 10.2 Mounting Hints for Swagelok -Fittings HB_SGM72_Rehm_eng.DOC... -
Page 36: Charcoal Filter: Description And Using Hints
Oxygen Monitor SGM7.2 10 Attachment 10.3 Charcoal Filter: Description and Using Hints 10.3.1 Filter Construction The figure above shows the charcoal filter. Two caps close a tube containing charcoal. Both caps have been pressed into the tube. The Swagelok fittings have closing stopper against falling out of the charcoal. -
Page 37: Eu Declaration Of Conformity
Oxygen Monitor SGM7.2 10 Attachment 10.4 EU Declaration of Conformity HB_SGM72_Rehm_eng.DOC... -
Page 38: Warranty Conditions
10 Attachment 10.5 Warranty Conditions ZIROX warrants that the equipment manufactured and sold by it will be free of defects in workmanship or material upon delivery. Should any failure corresponding to this warranty conditions become apparent during a period of 12... -
Page 39: Remarks And Own Notes
Oxygen Monitor SGM7.2 11 Own Notes 11 Remarks and Own Notes HB_SGM72_Rehm_eng.DOC...