Hanna Instruments HI 110 - Manual (Page 21)

21
All the instruments are factory calibrated for temperature.
Hanna’s temperature probes are interchangeable and no temperature
calibration is needed when they are replaced.
If the temperature measurements are inaccurate, temperature recalibration
should be performed.
For an accurate recalibration, contact your dealer or the nearest Hanna
Customer Service Center, or follow the instructions bellow.
• Prepare a vessel containing ice and water and another one containing hot
water (at a temperature of around 50 ºC). Place insulation material
around the vessels to minimize temperature changes.
• Use a calibrated thermometer with a resolution of 0.1 ºC as a reference
thermometer.
• With the instrument off, press and hold down the CAL&MEM keys, then
power on the instrument. The “CAL” tag will appear and the secondary
LCD will show 0.0 ºC.
• Immerse the temperature probe in the vessel with ice and water as near
as possible to the reference thermometer. Allow a few seconds for the probe
to stabilize.
• Use the ARROW keys to set the reading on the secondary LCD to that of ice
and water, measured by the reference thermometer. When the reading is
stable and close to the selected calibration point, “READY” tag will appear
and “CFM” tag will blink.
• Press CFM to confirm. The secondary LCD will show 50.0 ºC.
• Immerse the temperature probe in the second vessel as near as possible to
the reference thermometer. Allow a few seconds for the probe to stabilize.
TEMPERATURE CALIBRATION
(for technical personnel only)
CAL
GLP
CFM
CAL