Hanna Instruments pH 300, Instruction Manual, Page: 27 / 57

53 52
• Wait for about 30 seconds. Press CFM.
The secondary LCD section will show
"
50.0
°C".
• Immerse the temperature
probe in the vessel with hot
water.
• Wait for about 30 seconds.
Press CFM.
• Complete your temperature
calibration by pressing CAL
if you do not want to per-
form the mV calibration (see
page 44).
PROCEDURE FOR pH 301
• Switch the pH 301 on while pressing CFM.
The "CAL" indicator will be lit. The sec-
ondary LCD section will show "
0.0
°C".
• Immerse the temperature
probe in the vessel with the
ice and water and wait for a
few minutes.
CFM
°C
CAL
50 °C
(122 °F)
°C
CAL
°C
CAL
CFM
0 °C
(32 °F)
°C
CFM
ON
(for Technical Personnel only)
The pH meter has been factory calibrated for
the temperature and is ready for measure-
ments.
The temperature probes are interchangeable
and no temperature calibration is needed when
the temperature probe is replaced.
If, for any reason, the temperature measure-
ments are inaccurate, re-calibration should
be carried out as follows.
INITIAL PREPARATION
• Prepare a
vessel con-
taining ice (at
0 . 0 ° C / 3 2 ° F )
and water and
another one
containing hot
water (at a temperature of 50.0°C/122°F).
Place insulation material around the con-
tainer to minimize temperature changes.
• Use a ChecktempC or a calibrated ther-
mometer with a resolution of 0.1 °C as a
reference thermometer.
PROCEDURE FOR pH 300
• Switch the pH 300 on while pressing CAL.
The "CAL" indicator will be lit. The sec-
ondary LCD section will show "
0.0
°C".
• Immerse the temperature
probe in the vessel with the
ice and water.
TEMPERATURE CALIBRATION
0 °C
(32 °F)
°C
50 ºC
(122 ºF)
°C
0 °C
(32 °F)
°C
°C
CAL
ON
CAL