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Oxygen Monitor SGM7.2 6 Construction

6.1.3 Electronic measured-value processing

The following block circuit diagram illustrates the in principle construction of the
electronic measured-value processing.

Sensor

Amplifier for

Cell Voltage

Heater

Control

Microcontroller

Sensor Surveillance

Pow er

Supply

1.0 A

0.8 A

Amplifier for

Thermocouple

Display

Keyboard

DC-Output

Relay Outputs

RS-232

110-230 V/50-60 Hz

Analog out

Fig. 3: Block circuit diagram of the SGM7.2

HB_SGM72_Rehm_eng.DOC

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Содержание SGM7.2

Страница 1: ...oren Elektronik GmbH Greifswald Am Koppelberg 21 D 17489 Greifswald 49 3834 8309 00 Fax 29 e mail info zirox de ZIROX Oxygen Measuring Systems SGM7 2 Oxygen measuring device for inert and reactive gas...

Страница 2: ...SGM7 2 Manual Oxygen measuring device for the determination of oxygen concentrations in inert and reactive gases Range 2 10 5 10 20 Vol ppm Power supply 100 240 V 47 63 Hz HB_SGM72_Rehm_eng DOC 2...

Страница 3: ...6 1 Principle construction 15 6 1 1 General overview 15 6 1 2 Construction principle of the solid electrolyte sensor 15 6 1 3 Electronic measured value processing 17 6 2 Using and connection elements...

Страница 4: ...use of potentiometric ZrO2 solid electrolyte sensors for the optimal guidance of combustion processes 31 10 2 Mounting Hints for Swagelok Fittings 35 10 3 Charcoal Filter Description and Using Hints 3...

Страница 5: ...im of making technical improvements the user is responsible to insert the additional or updated pages supplied Secure and proper function of the SGM7 2 can only be guaranteed when the contents of this...

Страница 6: ...out situations where indirect hazards occur 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 t...

Страница 7: ...protecting gases The introduction of explosive gas mixtures high concentrations of halogens or sulphuric gases e g SO2 into the SGM7 2 is not permitted The contact of the SGM7 2 with silicon or phosph...

Страница 8: ...ated 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 Explosive gas mixtures halogens in high conce...

Страница 9: ...en at the reference electrode in dry air in Pa pO2 meas gas partial pressure of the oxygen at the measuring electrode in the measured gas in Pa The sensor of the SGM7 2 is based on the conductivity of...

Страница 10: ...g gas mixtures in which oxygen only exists in bound form e g in H2 H2O or CO CO2 mixtures In reducing gas mixtures the oxygen partial pressure is inversely proportional to the temperature For converti...

Страница 11: ...ppm the following aspects must be taken into account during evaluation composition of the measured gas e g presence of burning gases specific characteristics of the production process e g material use...

Страница 12: ...pressure Max permitted temp of the gas 80 C p over measuring cell approx 1 kPa 100 mm WS at 10 l h Working conditions 10 45 C rH 80 at 20 C Storage conditions 20 60 C rH 95 at 20 C Degree of protecti...

Страница 13: ...easuring cell temperature in C Table 2 Error Indication Error code Description Error0 Transmission error Error1 Warm up Error2 Cell temperature to low Error3 Thermocouple defect Error6 System error An...

Страница 14: ...ump high pCR pXCR scan pump state X 0 pump off X 1 pump low X 2 pump high Control input for pump relay 24 V DC internal inverse polarity protection and free wheeling diode Table 5 Pin config for 7 pol...

Страница 15: ...ngests the measuring gas In the first case the optional pressure reducer or needle valve at the gas inlet can be used to control the gas flow If the pump is installed the gas flow is controlled by a f...

Страница 16: ...es and the ceramic tube form a galvanic solid electrolyte measuring cell Measuring Cell Sensor To gain a higher oxide ion conductivity of the zirconium dioxide tube the sensor is heated to 750 C This...

Страница 17: ...le construction of the electronic measured value processing Sensor Amplifier for Cell Voltage Heater Control Microcontroller Sensor Surveillance Pow er Supply 1 0 A 0 8 A Amplifier for Thermocouple Di...

Страница 18: ...SGM7 2 Depending on the size the measured values are shown either in vol or in vol ppm on a display A green or orange light serves as operating indication depending on chosen limit value and actually...

Страница 19: ...p control relay included the RS232 Interface the pump switch and the power switch will be found at rear panel The gas inlet is connected with the charcoal filter The inlet of the filter is located at...

Страница 20: ...e 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...

Страница 21: ...nnecting pipes Low temperature of measuring gas Thick wall PVC hose Higher temperature of measuring gas Tygon R 3603 supplier e g Novodirekt Kehl Oxygen concentration of 100 ppm Stainless steel pipe S...

Страница 22: ...8 1 2 Gas flow adjustment For ensuring an exact measuring a throughput of 5 to 10 l h have to be adjusted For measurements via bypass the flow will be realized by internal pump At overpressure of the...

Страница 23: ...ssages State Display Remark 0 OK 1 LIMIT 2 RANGE no alarm 3 RANGE no alarm 4 FLOW 5 l h 5 FLOW 10 l h 6 7 8 9 WARM UP cell temperature too low wait after approx 15 minutes 750 C has been reached 10 CE...

Страница 24: ...x measuring value 20 000 21 000 Vol or 200000 210000 ppm greater values on request This value corresponds to the final value of the analog signal e g 20 mA Response time t90 1 99 s Formed by arithmeti...

Страница 25: ...n conclusion again by the key A Main Display OXYGEN flow 20 64Vol WARM UP State line PUMP OFF 650 C Pump state on off by key and cell temperature Following states will be visualised by LED red blinkin...

Страница 26: ...ppm END MARK 206400 ppm AVERAGE FACTOR 1 s 1 99s RETURN B 4 Calibration CALIBRATION CALIBR ZERO POINT CALIBR SPAN GAS RETURN B 4 1 Calibration Zero Point CALIBR ZERO POINT MEAS VALUE 206400 ppm actual...

Страница 27: ...measuring value SPAN GAS 1000 ppm adjustable CALIBR SPAN WAIT 5 Calibration state CALIBR VALUE 1 00 Calibration value 2 RETURN 2 If this line has been activated and key Enter has been pressed for app...

Страница 28: ...ved by RETURN and ENTER The calibration will be saved by quit with YES 8 3 2 Span Gas Calibration For this the SGM7 2 must be flowed through by certified span gas oxygen concentration near later measu...

Страница 29: ...a low value for the oxygen concentration is expected micro leakages in the gas supply checking fittings Measurement is dependent on the throughput the smaller the flow the greater the value or revers...

Страница 30: ...to the overhaul If not using the SGM7 2 has to be stored in the original packing if possible in a dry dust free room storage 9 2 Replace the equipment fuse It are to turn the SGM7 2 off and to separa...

Страница 31: ...trolyte cells in the guidance of combustion processes is based are described in the following Oxygen concentration and air factor lambda The best way of describing the conversion of gaseous liquid or...

Страница 32: ...hydrocarbons are present Fuel gases can also contain hydrogen carbon monoxide and nitrogen Apart from that the supplied air with its humidity and carbon dioxide content also contributes to the gas eq...

Страница 33: ...sured between the electrodes that is higher the more the oxygen concentrations at the two electrodes differ In 1889 NERNST was the first to describe the quantitative connection between the cell potent...

Страница 34: ...1 In several technical processes the quotient Q H2O H2 has to be known which can be calculated from this equation If the measuring electrode is the negative pole of the cell the cell voltage is given...

Страница 35: ...Oxygen Monitor SGM7 2 10 Attachment 10 2 Mounting Hints for Swagelok Fittings HB_SGM72_Rehm_eng DOC 35...

Страница 36: ...he filter The filter or the charcoal filling must be changed 10 3 3 Replacing A saturated filter can be recycled by replacing the activated carbon filling only For this purpose the charcoal must be po...

Страница 37: ...Oxygen Monitor SGM7 2 10 Attachment 10 4 EU Declaration of Conformity HB_SGM72_Rehm_eng DOC 37...

Страница 38: ...permissible In the case of combination of ZIROX products with non ZIROX products which are not approved by ZIROX any warranty claim is invalid Warranty and warranty claims are only accepted if they a...

Страница 39: ...Oxygen Monitor SGM7 2 11 Own Notes 11 Remarks and Own Notes HB_SGM72_Rehm_eng DOC 39...

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