Hanna Instruments HI 9321 - Manual (Page 24)

2 4
ADDITIONAL CALIBRATION
PROCEDURES & INFORMATION
(for technical personnel only)
TEMPERATURE CALIBRATION
Initial Preparation
• Prepare a vessel containing ice and water and another one
containing hot water (at a temperature of at least 50°C). Place
insulation material around the container to minimize tempera-
ture changes.
• Use a ChecktempC or a calibrated ther-
mometer with a resolution of 0.1 °C as a
reference thermometer.
Procedure
• With the instrument off, press both CAL and ON keys simulta-
neously. The "CAL" indicator will be lit and the secondary LCD
section will show 0.0°C.
• Immerse the temperature probe in the
vessel with the ice and water as near to
the ChecktempC as possible.
• Wait for temperature reading to stabilize.
• Use the
↑↑↑↑↑
°C or
↓↓↓↓↓
°C keys to set the
reading on the secondary LCD to that of
ice and water.
• Press CFM. The secondary LCD will show 50.0°C.
• Immerse the temperature probe in second
vessel.
0 °C
(32 °F)
°C
50 ºC
(122 ºF)
°C
CAL
°C
0 °C
(32 °F)
°C
CAL
°C
50 °C
(122 °F)
°C