User Guide

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• If the HI7669/2W temperature probe is
not connected to the meter, once the
selected buffer value is confirmed,
"25°C" or "77.0°F" will start blinking on
the TEMP. display to prompt the se-
lection of the calibration temperature
value.
Take the temperature
of the solution with a
Checktemp or a glass
thermometer.
Enter the correct buffer
temperature value by
using the numeric keys
and press ENTER to
confirm the temperature
setting.
Now the calibration procedure is com-
plete.
• To quit the calibration mode,
press the CAL key.
• To clear the numeric data
entry, press CLEAR key.
• The instrument should be calibrated
weekly or every time the probe has
been changed.
PROCEDURE WITHOUT ATC (MTC)
• If you need to calibrate without ATC,
press the ATC/MTC key and the deci-
mal point will blink on the TEMP. LCD
ENTER
CAL
PGM
Clear
CONDUCTIVITY
CAL
%TC
S
µ
BUF
CONDUCTIVITY
%TC
S
µ
BUF
CON
CON
CONDUCTIVITY
CAL
%TC
S
µ
BUF
CAL
• The "CAL" and "
BUF
"
prompts will appear
on the large display
and the " " sym-
bol will start blink-
ing. Wait for ap-
proximately 30 sec-
onds for the reading
to stabilize.
• When the value is
stable, " " and
"CAL" symbols will
disappear and the
"CON" symbol will
start blinking to
prompt the user to
confirm the reading.
• Press the CON key
to confirm the cali-
bration.
The conductivity calibration procedure is now
complete.
Notes:
• If the buffer value
differs by more
than ±15% from
the ideal value,
the "
BUF
" symbol
will blink on the
display.
Press the CAL
key to exit the
calibration mode
and repeat the
procedure using
the correct buffer.