Metrohm 949 - Page 29

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5 Operation
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21
Setting Meaning Selection Default value
P1.7
SET DUE CAL
pH calibration time NO | HOURS | DAYS NO
P1.8
RESET SETTINGS
Reset pH settings YES | NO NO
P1.9
TEMPERATURE CAL
pH temperature offset YES | NO
P1.1 Buffer selection
P1.1 is used to select the buffer family for the electrode calibration.
1 to 3 points can be calibrated.
￭ Press the
button during calibration to exit the calibration and save
the points calibrated up to that point.
The 949 pH Meter automatically detects (see chapter 5.5.3, page 24) 3
buffer families (METROHM, USA, NIST). A manual calibration (see
chapter 5.5.4, page 27) (CUSTOM) with up to 2 calibration points can
also be carried out with user-defined values.
￭ METROHM buffer: 4.00– 7.00
1)
– 9.00
￭ USA buffer: 1.68– 4.01– 7.00
1)
– 10.01– 12.45
￭ NIST buffer: 1.68– 4.00– 6.86
1)
– 9.18– 12.46
Default value: METROHM
1)
Neutral point is always requested first.
The bottom left of the display shows a row of beakers in measuring
mode. This row shows which buffers were used for the last automatic cali-
bration and the last manual calibration.
P1.2 Resolution
P1.2 is used to select the resolution for the pH measurement.
￭ 0.1
￭ 0.01
Default value: 0.01
P1.3 Stability
P1.3 is used to select the stability of the pH measurement.
Metrohm recommends waiting for the stability of the measurement indi-
cated by the
symbol. The symbol will appear on the display if the
measurement is not stable.