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<13.  MEASUREMENT PRINCIPLE>

13-2

IM 11P03A03-01E

6th Edition : Jan. 26, 2022-00

For example, if carbon dioxide which has a smaller susceptibility than nitrogen is passed through 

the cell, the indication deflects to a negative value. If the cell is tilted (angled) to compensate the 

indication as shown in Figure 13.3, a counterforce acts to supply more auxiliary gas into path A 

due to the higher density of carbon dioxide, thus changing the flow ratio of the auxiliary gas. By 

changing the cell angle so that the change in the auxiliary gas flow ratio due to gas susceptibility 

cancels out the flow ratio change due to the density difference, the interference error can be 

compensated.

The model MG8 paramagnetic oxygen analyzer is shipped after adjusting the cell inclination in 

the final adjustment stage using the magnetic characteristics and density of the measuring gas of 

the user. In this case, the inclination is stored using a built-in level (containing a bubble in a glass 

tube).

When this analyzer is installed at the user’s site, turning the rotary knob so that the bubble of this 

level returns to the center reproduces the adjustment when shipped.

Magnetic field

Thermistor

Stream B

Stream A

Gas outlet

Auxiliary gas inlet

Measurement gas inlet

F16.2E.ai

Figure 13.2 

Top of Cell

Stream B

Stream A

Auxiliary gas

Inclination

F16.3E.ai

Thermistor

Figure 13.3 

Cross Section of Cell

l

 How to adjust the inclination

If the attitude must be adjusted differently, e.g., if the composition of the measuring gas changes, 

follow the procedure described in Chapter 8, “ PREPARATIONS” and the angle adjustment 

procedure for interference gas compensation.

The model MG8 analyzer allows the angle to be adjusted from outside of the explosion-protected 

enclosure in order to preserve the explosion-protected condition. (However, since the analyzer 

scarcely requires inclination adjustment for an MS code with a span of 5 % or more, adjustment 

is done by opening the explosion-protected door, if necessary.)

Содержание MG8G

Страница 1: ...User s Manual Model MG8G Paramagnetic Oxygen Analyzer IM 11P03A03 01E IM 11P03A03 01E 6th Edition...

Страница 2: ...kg Handle it with care Be sure not to accidentally drop it Handle it safely to avoid injury l Check of Model Name and Specifications The nameplate on the inside of the converter door shows the main i...

Страница 3: ...cial care the operator must take to avoid such risks CAUTION This symbol indicates that the operator must refer to the instructions in this manual in order to prevent the instrument hardware or softwa...

Страница 4: ...that some of the images contained in this user s manual are display examples n Warning and Disclaimer The product is provided on an as is basis YOKOGAWA shall have neither liability nor responsibility...

Страница 5: ...Blank Page...

Страница 6: ...2 4 4 External Wiring 4 2 4 4 1 Power Wiring and Grounding 4 2 4 4 2 Analog Output Wiring 4 3 4 4 3 Wiring for Solenoid Valves for Automatic Calibration 4 3 4 4 4 Contact Output Wiring 4 4 4 4 5 Conta...

Страница 7: ...3 8 6 Setting the Range Switching Answerback Contact Output 8 4 9 CALIBRATION 9 1 9 1 Overview 9 1 9 2 Calibration Coefficient 9 1 9 2 1 Zero Calibration Coefficient 9 1 9 2 2 Span Calibration Coeffic...

Страница 8: ...Faulty Readings During Measurement 12 3 12 2 1 Fluctuations in Readings 12 3 12 2 2 Drift in Readings 12 3 12 2 3 Short Term Shift in Readings 12 3 12 3 When Calibration Cannot Be Executed 12 4 12 4 I...

Страница 9: ...Blank Page...

Страница 10: ...etween the input and output sections Further the instrument is provided with one touch calibration and self test functions to improve operability maintainability and reliability n Standard System Conf...

Страница 11: ...e Pressure gauge Analog output Contact output Contact input Power supply Atmosphere vent Sampling gas Auxiliary gas Filter Flow meter Flow control valve Zero gas Span gas Figure 1 2 System Configurati...

Страница 12: ...N ZERO FUNC MEAS MAINT DECIMAL POINT SHIFT INCR EXEC PARAMAGNETIC OXYGEN ANALYZER FUNC HEATER AUTO CAL MRT RANGE AUTO RANGE LCL RANGE MEANS MAINT H ALM L ALM FAIL DATA OUT PUT vol O2 Operation keys F5...

Страница 13: ...Blank Page...

Страница 14: ...and measured gas Maximum load AC 1A Contact input Input specification Contact ON 200 or less Contact OFF 100 k or greater Remote range switching 2 points Output ranges 1 to 3 can be switched by exter...

Страница 15: ...tegory II Pollution degree 2 Note Installation category called overvoltage category specifies impulse withstand voltage Pollution degree indicates the degree of existence of solid liquid gas or other...

Страница 16: ...quest as a Customized Order STANDARD ACCESSORIES Item Parts No Qty Description Fuse A1111EF 2 250V 2A Spanner G7050YZ 1 for adjustment of sensor angle Regulator G7033XF 1 for Auxiliary gas Mirror K932...

Страница 17: ...Blank Page...

Страница 18: ...nd wherever possible do not install the analyzer near motor electromagnetic relays pumps etc 7 Easy access for maintenance and inspection 3 2 Installation Procedure This oxygen analyzer can be panel o...

Страница 19: ...ty by components of the sample gas 1 Piping The standard line diagram is shown in figure 3 3 Use 6 4 mm diameter metal tubes for lines and connect the tubes in such a way that there are no leaks 2 Ins...

Страница 20: ...le gas Auxiliary gas Filter Flow meter Flow control valve Pressure gauge Pressure regulator F6 1E ai 180 kPa Figure 3 3 Line Diagram Purge air outlet with blind seal Purge air inlet Rc 1 8 female thre...

Страница 21: ...Blank Page...

Страница 22: ...y a supplied jumper plate 1 2 3 4 5 6 7 8 9 FG CAL START 4 20mA DC COM R3 R2 RANGE CHANGE ANALOG OUTPUT CONTACT INPUT 10 11 12 13 14 15 16 17 18 R3 HI MAIT CAL FAIL R2 LO COM RANGE OUT HL ALM CONTACT...

Страница 23: ...reaker conforming with IEC 60947 1 or IEC 60947 3 3 It is recommended that the external switch or circuit breaker be mounted into the equipment which the product is installed 4 The external switch or...

Страница 24: ...act input Figure 4 2 Analog Output Wiring 4 4 3 Wiring for Solenoid Valves for Automatic Calibration This wiring is for the solenoid valves that switch zero span and sample gas lines in automatic or s...

Страница 25: ...Contact Output Either high low alarm contact output or range answerback contact output can be selected For their detailed functions and setting procedures refer to Chapter 8 Parameter Settings Termin...

Страница 26: ...ut Note that the resistance includes wiring resistance Contact closes at 200 or less Contact opens at 100 k or more 1 2 3 4 5 6 7 8 9 FG CAL START 4 20mA DC COM R3 R2 RANGE CHANGE ANALOG OUTPUT CONTAC...

Страница 27: ...Blank Page...

Страница 28: ...ing the adjustment screw counterclockwise brings the bubble position toward the front of the instrument 5 Tighten the four bolts with the wrench Make sure that the bubble is in position 6 Replace the...

Страница 29: ...is indicated on the name plate on the inside of the instrument door Figure 5 2 shows an example of the name plate that indicates the specified pressure of the auxiliary gas SUFFIX MA 5 WL JN C F0502...

Страница 30: ...EXEC key to switch measurement MEAS mode and maintenance MAINT mode SPAN Used to execute span calibration in calibration Used to enter span gas concentration in setting ZERO Used to execute zero cali...

Страница 31: ...gas is selected in calibration gas concentration setting Blinks when span calibration is required ZERO Lights when zero calibration is selected in calibration Lights when zero gas is selected in calib...

Страница 32: ...3 Changing the Function Number Each function is assigned to the Function Numbers Parameters can be viewed and set in the relevant Function Number The Function Number can be changed using the FUNC keys...

Страница 33: ...s dependent on the specifications ENABL INHIBIT SPAN ZERO FUNC DECIMAL POINT SHIFT INCR EXEC MEAS MAINT Press SHIFT key The leftmost digit of 2 blinks indicating that the digit can be changed ENABL IN...

Страница 34: ...on FUNC display DATA display shows 1 the currently selected range ENABL INHIBIT SPAN ZERO FUNC DECIMAL POINT SHIFT INCR EXEC MEAS MAINT Press SHIFT key 1 blinks indicating that the digit can be chang...

Страница 35: ...0 to 25 O2 22 Setting high low limit alarm function 0 disabled 1 enabled 30 Checking temperature C of constant temperature chamber 31 Checking sensor emf mV 40 Executing error check 41 Resetting senso...

Страница 36: ...ied pressure 3 the supply voltage meets the instrument specifications and 4 no sample gas has been introduced Then turn on the power switch located next to the external connection terminals inside the...

Страница 37: ...ized A calibration cannot be executed in this period When the temperature in the sensor unit stabilized completely the MAINT lamp stops blinking and the MEAS lamp turns on This is steady state During...

Страница 38: ...tion Gas Requirements As the zero gas use nitrogen with a minimum purity of 99 99 As the span gas use a gas with an oxygen concentration of 80 to 100 of the upper range value of set range e g for the...

Страница 39: ...calibration are installed pressing the SPAN key closes the solenoid valve in zero gas line and opens the solenoid valve in span gas line 6 The oxygen concentration on the DATA display changes When the...

Страница 40: ...set to enabled or disabled When the function is set to enabled the analog output is held at the last measured value during calibration when set to disabled the instrument outputs measured values durin...

Страница 41: ...e INCR key repeatedly to increase the blinking number 0 1 2 9 and returns to 0 8 2 Setting the Fail Contact The Fail contact terminals 15 and 16 is activated when an error occurs The contact can be pr...

Страница 42: ...ct is activated when the measured value is equal to or higher than the high alarm setpoint or when the measured value is equal to or less than the low alarm setpoint The alarm contact does not operate...

Страница 43: ...sed when the high low limit alarm function is enabled 1 Switch to MAINT mode and enter the password 2 Change the Function Number to 22 3 Set to 0 to disable the high low limit alarm function using the...

Страница 44: ...cs is obtained from the following equation cs k ps p1 Calibration is for obtaining k When only a zero calibration is performed the instrument is calibrated to the zero gas s value and the ratio of the...

Страница 45: ...to 05 The DATA display shows rES 3 Press the EXEC key to initialize the calibration coefficients CAUTION The calibration coefficients disolayed in Function No 03 are still the previous ones after the...

Страница 46: ...rt calibration when the dry voltage free contact connected to the input is closed For the semiautomatic calibration the following should be set 1 Zero calibration time Function No 52 The amount of tim...

Страница 47: ...ter the automatic calibration function was started The setting range is from 0 day 0 hour to 99 days 24 hours When the time is set to 00 day 00 hour the initial wait time is equal to the time set as t...

Страница 48: ...sired interval using the SHIFT and INCR keys Press the EXEC key to accept 6 Change the Function Number to 55 to set whether or not to execute span calibration Set to 0 not to execute span calibration...

Страница 49: ...tion is enabled After power is restored calibrations will be executed on schedule there is no delay due to the power interruption Note that the internal timer does not work when the power supply is in...

Страница 50: ...ssword 2 Change the Function Number to 58 The DATA display shows an oxygen concentration 3 Press the ZERO key to open the solenoid valve in zero gas line and close the solenoid valve in sample gas lin...

Страница 51: ...30 Checking temperature C of constant temperature chamber 31 Checking sensor emf mV 40 Executing error check 41 Resetting sensor emf error status 42 Resetting calibration coefficient error status 43 S...

Страница 52: ...and Restarting the Operation The most common failure or trouble occurs when stopping or restarting the operation Extreme care should be taken 1 When sample gas contains corrosive components turn off...

Страница 53: ...fuse deteriorates with time It is recommended that the fuses be replaced every two years even if the fuse has not blown CAUTION If the fuse blows again soon after replacement there may be a malfuncti...

Страница 54: ...E 20 In stabilization period or steady state heater temperature continues to fall below 55 C for at least 10 seconds Turn off power to heater Remove the causes Turn the power off and on again to resta...

Страница 55: ...wer supply voltage fluctuates 2 The ambient temperature is outside the specification range 5 to 55 C n Constant Temperature Chamber Errors E 22 E 23 A constant temperature chamber error E 22 or E 23 o...

Страница 56: ...drift or characteristics change with time initialize the calibration coefficients and perform zero and span calibration again When the error occurs during semiautomatic or automatic calibration remove...

Страница 57: ...ailure is 80 ms or shorter in the case of the instrument with a power supply of 100 to 115 V AC or if the duration of power failure is 350 ms or shorter in the case of the instrument with a power supp...

Страница 58: ...Constant resistance circuit Constant resistance circuit Figure 13 1 Measurement Principle 13 2 Principle of Interference gas Compensation Although measurements by the paramagnetic oxygen analyzer uti...

Страница 59: ...se the inclination is stored using a built in level containing a bubble in a glass tube When this analyzer is installed at the user s site turning the rotary knob so that the bubble of this level retu...

Страница 60: ...List MG8G Paramagnetic Oxygen Analyzer CMPL 11P03A03 01E 1st Edition Feb 2016 YK 1 Item Part No Qty Description 1 A1111EF 2 Fuse All Rights Reserved Copyright 2016 Yokogawa Electric Corporation Subjec...

Страница 61: ......

Страница 62: ...ll review Nov 2008 4th Edition Revised and style change from B to C Aug 2007 3rd Edition Revised and Corrected over all e g After Sales Warranty Revision Information etc are added IM Format and Style...

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