Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 Manual de usuario descargar pdf (Pagina 205)

<17. CALIBRATION OF SENCOM pH/ORP>

17-4

IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00

l zero/slope

Select the solution that works with the “buffer solution” selected in calibration settings and

perform calibration by following the prompts on the screen.

l zero/slope/ITP(3point)

Calibrationisperformedinthesequenceofthesequenceselectionmenu(Table17.1)ofthe

solution that works with the “buffer solution” selected in calibration settings. Perform calibration

by following the prompts on the screen.

Limitations

• ThreedifferentbuffersolutionswhosedifferenceinpHvaluebetweenbuffersolutionsis1

pH or more should be used.

 (1stbuffer<2ndbuffer<3rdbufferor1stbuffer>2ndbuffer>3rdbuffer)

• The2ndbuffersolutioninthebuffertableintheFreeprogrammablescreenshouldbepH7

±2(at25ºC).

• Eitherofthefollowingconditionsshouldbemet.

- The temperature difference between the 1st and 2nd buffer solutions should be 5ºC or less.

The temperature of the 1st and 2nd buffer solutions is at least 20ºC higher or lower than the

temperature of the 3rd buffer solution.

- The temperature difference between the 2nd and 3rd buffer solutions should be 5ºC or less.

The temperature of the 2nd and 3rd buffer solutions is at least 20ºC higher or lower than the

temperature of the 1st buffer solution.

l zero/slope1,2(3point)

Calibrationisperformedinthesequenceofthesequenceselectionmenu(Table17.1)ofthe

solution that works with the “buffer solution” selected in calibration settings. Perform calibration

by following the prompts on the screen.

Limitations

• ThreedifferentbuffersolutionswhosedifferenceinpHvaluebetweenbuffersolutionsis1

pH or more should be used.

 (1stbuffer<2ndbuffer<3rdbufferor1stbuffer>2ndbuffer>3rdbuffer)

• Thetemperaturedifferencebetweenthe1stand2ndbuffersolutionsshouldbe20ºCor

less.

• Thetemperaturedifferencebetweenthe2ndand3rdbuffersolutionsshouldbe20ºCor

less.

Table 17.1 Selection of Buffer Solutions in Three-point Calibration

Buffer settings Buffer sequence selection menus

NIST/DIN19266 PH1.7→PH6.9→PH9.2

PH4.0→PH6.9→PH9.2

PH9.2→PH6.9→PH1.7

PH9.2→PH6.9→PH4.0

DIN19267 PH4.7→PH6.8→PH9.2

PH9.2→PH6.8→PH4.7

US PH4.0→PH7.0→PH10.0

PH10.0→PH7.0→PH4.0

Userdenedbuffer table1→table2→table3

able3→table2→table1

1 2 ... 200 201 202 203 204 205 206 207 208 209 210 ... 245 246

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Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 Manual de usuario Pagina 205

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