User Manual

<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