35
• Use a Checktemp or a calibrated thermometer with a
resolution of 0.1 ° as a reference thermometer.
• Immerse the temperature probe in the
beaker with ice and water as near to the
Checktemp as possible.
• Press and hold first CFM and then
CAL to enter the temperature cali-
bration mode.
• Execute the password procedure.
• With pH500, the meter will ask for
the calibration procedure code number. Use
or
to
select code 1 for the temperature calibration and press
CFM to enter.
• CAL will blink on the LCD until the
meter confirms a steady reading.
• When the reading has stabilized at a
point near the first calibration point,
CAL will stop blinking and an inter-
mittent CFM will prompt the user to
confirm the first calibration.
• If the reading stabilizes at a read-
ing significantly variant from the first
setpoint, an intermittent WRONG will
prompt the user to check the beaker or
baths.
• After pressing CFM the unit will switch to the second
calibration point.
• Select 25 or 50 °C by pressing
or
.
0 °C
(32 °F)
°C
