12
Each meter has been factory calibrated for temperature with the supplied D.O.
probe and is ready for measurements.
The D.O. probes are interchangeable and no temperature calibration is
needed.
If the temperature measurements are not accurate, temperature recalibration
should be performed.
For an accurate recalibration, contact your dealer or the nearest Hanna
Customer Service Center, or follow the procedure below.
• Prepare a vessel containing ice and water and another one containing hot
water (at a temperature of around 50 °C). Place insulation material
around the vessels to minimize temperature changes.
• Use a
ChecktempC
or a calibrated thermometer with a resolution of 0.1
°C as a reference thermometer. Connect the
HI 76407/2
D.O. probe to the
appropriate socket.
• With the instrument off, press and hold down
CAL
, then power on the
instrument. The "CAL" tag will appear and the secondary LCD will show
0.0 °C.
• Immerse the D.O. probe in the vessel with ice
and water as near as possible to the
ChecktempC
. Allow a few seconds for the probe
to stabilize.
• Use the "
" or " " key to set the reading on the secondary LCD to that
of ice and water, measured by
ChecktempC
. When the reading is stable,
"CFM" tag starts blinking.
• Press
CFM
to confirm. The secondary LCD will
show 50.0 °C.
TEMPERATURE CALIBRATION
(for technical personnel only)
CAL
CAL
CFM
