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ZIROX SGM7.2, Manual

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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 pump 

off 

P1CR P1CR pump 

low 

P2CR P2CR pump 

high 

pCR p

X

CR 

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. Socket and connection cable with plug (1,5m long) 

Pin Description Cable 

colour 

1 

limit relay NC contact 

blue 

2 

limit relay NO contact 

brown 

3 

limit relay central contact 

green 

4 pump 

control 

white 

5 pump 

control 

grey 

6 output 

+ 

pink 

7 output 

- 

yellow 

 

HB_SGM72_Rehm_eng.DOC 

14

 

Summary of Contents for SGM7.2

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

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

Page 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...

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

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