Rosemount 755A, Инструкция по эксплуатации

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C
ONTENTS
245364-U Rosemount Analytical April 2000 iii
Model 755A Oxygen Analyzer
S
ECTION
4. R
OUTINE
O
PERATION
4.1 ROUTINE OPERATION ...........................................................................4-1
4.2 EFFECT OF BAROMETRIC PRESSURE CHANGES ON
INSTRUMENT READOUT ............................................................4-1
4.3 CALIBRATION FREQUENCY ..................................................................4-1
S
ECTION
5. T
HEORY
5.1 PRINCIPLES OF OPERATION ................................................................5-1
5.2 VARIABLES INFLUENCING PARAMAGNETIC OXYGEN
MEASUREMENTS ........................................................................5-5
5.2.1 Pressure Effects..........................................................................5-5
5.2.2 Temperature Effects....................................................................5-5
5.2.3 Interferents.................................................................................5-6
5.2.4 Vibration Effects..........................................................................5-6
5.3 ELECTRONIC CIRCUITRY ......................................................................5-6
5.3.1 Detector/Magnet Assembly .........................................................5-7
5.3.2 Control Board and Associated Circuitry ......................................5-7
5.3.3 Case Board .................................................................................5-9
5.3.4 Isolated Current Output Board (Optional)....................................5-10
5.3.5 Alarm Option ...............................................................................5-10
S
ECTION
6. E
LECTRONIC
C
IRCUIT
A
NALYSIS
6.1 OVERVIEW ..............................................................................................6-1
6.2
±
15VDC POWER SUPPLY.......................................................................6-1
6.3 CASE HEATER CONTROL CIRCUIT ......................................................6-1
6.4 DETECTOR HEATER CONTROL CIRCUIT ............................................6-6
6.5 DETECTOR LIGHT SOURCE CONTROL CIRCUIT ................................6-7
6.6 DETECTOR WITH FIRST STAGE AMPLIFIER AND PRESSURE
COMPENSATION CIRCUITS .......................................................6-8
6.7 BUFFER AMPLIFIERS U10 AND ASSOCIATED ANTICIPATION
FUNCTION....................................................................................6-12
6.8 DIGITAL OUTPUT CIRCUIT.....................................................................6-12
6.9 ANALOG OUTPUT CIRCUITS FOR RECORDER AND ALARMS ...........6-13