Hanna Instruments ph 301 사용자 설명서

23

22

Press UP or DOWN to get this information in
the following sequence:

a. Date of the last pH

calibration (month,
day and year)

b. Offset calibration

value expressed in
mV and displayed on
the primary LCD  with
the buffer used to
calibrate the offset on
the secondary LCD.

The offset pH value should be between
±30 mV. For values between ±30 and
±60 mV change the reference electrolyte
and repeat the calibration procedure. For
values higher than +60 mV or lower than
-60 mV the electrode is no longer reliable.
See the electrode maintenance section
on page 84.

c. Slope calibration

value directly ex-
pressed in mV/pH is
displayed on the pri-
mary LCD  with the
2

nd

 buffer used to

calibrate the offset on the secondary LCD.

Press pH followed by
CAL DATA and the
meter will display the
last pH calibration
data.

DATE

CAL

1

mV

pH

CAL

2

mV

pH

CAL

as close to the electrode as possible and wait
for 1-2 minutes.

If you know the temperature of the sample to
be tested you can compensate for it manu-
ally.

If manual temperature compensation is de-
sired the temperature probe must be dis-
connected from the instrument.
The display will then
show the default tem-
perature of 25°C or the
last recorded tempera-
ture reading. "°C" is
blinking.
Note the temperature of the
sample using a ChecktempC
or a glass thermometer.
The temperature can now be
adjusted with UP and DOWN.
If the temperature
probe is connected to
the meter, the second-
ary LCD figure dis-
plays the measured
temperature reading
and the "°C" indicator
does not blink. Press-
ing UP or DOWN will
not alter the tempera-
ture reading.

Press CAL DATA and the meter will display
the last pH calibration data.

°C

°C