Hanna Instruments hi 99163 Manuale Utente

To connect the probe
With the meter turned off, connect the FC 232D
probe to the DIN socket on the top of the meter by
aligning the pins and pushing in the plug. Tighten
the nut to ensure a good connection. Remove the
protective cap from the probe before taking any
measurements.

To turn the meter ON and check the battery
status
Press the ON/OFF/MODE button until the display
lights up. At start-up, all the LCD segments are
displayed for 1 second, then the percent indica-
tion of the remaining battery life is shown for an-
other second (E.g. % 100 BATT). The meter then
enters the normal measuring mode.
Note: If the display needs to be checked, keep the

ON button pressed while turning the meter on.
The meter will display all segments as long as
the button is pressed.

To freeze the display
While in measurement mode, press the SET/
HOLD button, HOLD appears on the secondary
display and the reading will be frozen on the LCD
(E.g. pH 5.73 HOLD). Press any button to return to
normal mode.

To turn the meter OFF
While in normal measurement mode, press the
ON/OFF/MODE button. OFF will appear on the
secondary display. Release the button.

Note: The meter is provided with an acoustic sig-

nal feature, which can be disabled using the
switch located in the battery compartment.

Note: When the meter detects the absence of a

temperature probe at its input, the Automatic
Temperature Compensation is turned off, and
the meter uses a default value of 25°C (77°F)
for the temperature measurement and com-
pensation. In this condition, the secondary LCD
shows 25.0°C (77.0°F) blinking. When a probe
is connected, the meter automatically returns
to the ATC mode, the ATC tag is turned on, and
the temperature is shown on the secondary
display.

Setup mode allows the selection of the tempera-
ture unit and of the pH buffer set.
To enter the Setup mode, press and hold the ON/
OFF/MODE button until CAL on the secondary dis-
play is replaced by TEMP and the current tem-
perature unit (E.g. TEMP °C). Then:

• for °C/°F selection, use the SET/HOLD button.

After the temperature unit has been selected,
press ON/OFF/MODE to enter the buffer set
selection mode; press ON/OFF/MODE twice to
return to the normal measuring mode.

• to change the calibration buffer set, after set-

ting the temperature unit, the meter will show
the current buffer set: “pH 7.01 BUFF” (for 4.01/
7.01/10.01) or “pH 6.86 BUFF” (for 4.01/6.86/
9.18). Change the set with the SET/HOLD but-
ton, then press ON/OFF/MODE to return to nor-
mal mode.

Note: To clean the meter, do not use aggressive

detergents. It is recommended to use water.

• Make sure the meter has been calibrated be-

fore use.

• If the probe is dry, soak it in HI 70300 storage

solution for one hour to reactivate it.

• Insert the tip of the probe into the sample to be

tested and wait until the 

 symbol on the top left

of the LCD is turned off.

• The LCD shows the pH value (automatically

compensated for temperature) on the primary
LCD, while the secondary LCD shows the tem-
perature of the solution.

• After each measurement, it is recommended

to perform a complete cleaning of the probe:
use the suitable Cleaning solutions (see "Ac-
cessories" section) and clean the probe tip thor-
oughly to eliminate dirtiness and avoid cross-
contamination.

• When not in use, switch the meter OFF and

clean the probe with the specific Cleaning so-
lutions (see "Accessories" section) before stor-
ing it.

pH calibration
For better accuracy, frequent calibration of the
instrument is recommended. In addition, the
instrument must be recalibrated whenever:

a) The pH electrode is replaced.
b) After testing aggressive chemicals.
c) Where high accuracy is required.
d) At least once a month.

• From normal mode, press and hold the ON/

OFF/MODE button until OFF on the secondary
display is replaced by CAL. Release the button.

• The LCD enters the calibration mode, display-

ing “pH 7.01 USE” (or “pH 6.86 USE” if the NIST
buffer set was selected). After 1 second the meter
activates the automatic buffer recognition fea-
ture. If a valid buffer is detected, then its value is
shown on the primary display, and REC ap-
pears on the secondary LCD. If no valid buffer is
detected, the meter keeps the USE indication
active for 12 seconds, and then replaces it with
WRNG, indicating that the sample being mea-
sured is not a valid buffer.

• For a single-point calibration with buffers pH

4.01, 9.18 or 10.01, the meter automatically ac-
cepts the calibration when the reading is stable;
the meter will show on the primary display the
accepted buffer, with the message “OK 1” on
the secondary display, and an audible signal is
produced. After 1 second the meter automati-
cally returns to the normal measuring mode.
If a single-point calibration with buffers pH 7.01
or 6.86 is desired, then after the calibration point
has been accepted the ON/OFF/MODE button
must be pressed in order to return to the nor-
mal measuring mode. After the button is
pressed, the meter shows "7.01" (or "6.86") -
"OK 1", and an audible signal is produced. After
1 second, the meter automatically returns to
the normal measuring mode.

Note: It is always recommended to carry out a

two-point calibration for better accuracy.

• For a two-point calibration, place the probe in

pH 7.01 (or pH 6.86) buffer. After the calibration
point has been accepted, the “pH 4.01 USE”
message appears. The message is held for
12 seconds, unless a valid buffer is recognized.
If no valid buffer is recognized, then the WRNG
message is shown. If a valid buffer (pH 4.01,
pH 10.01 or pH 9.18) is detected, then the meter
completes the calibration procedure. When the
buffer is accepted, the LCD shows the accepted
value with the “OK 2” message on the second-
ary display. The meter then returns to the nor-
mal measuring mode.

Note: When the calibration procedure is com-

pleted, the CAL tag is turned on.

To quit calibration and to reset to the de-
fault values
• After entering the calibration mode and before

the first point is accepted, it is possible to quit
the procedure and return to the last calibration
data by pressing the ON/OFF/MODE button. The
secondary LCD displays ESC for 1 second and
the meter returns to normal mode.

• To reset to the default values and clear a previ-

ous calibration, press the SET/HOLD button
after entering the calibration mode and before
the first point is accepted.
The secondary LCD displays CLR for 1 sec-
ond, the meter resets to the default calibration
and the “CAL” tag on the LCD disappears.

The meter displays the remaining battery percent-
age when turned on. When the level is below 5%,
the 

-    +

 symbol on the bottom left of the LCD blinks

to indicate a low battery condition. If the battery
level is low enough to cause erroneous read-
ings, the Battery Error Prevention System (BEPS)
turns the meter off.
Unscrew the 4 screws located on the back of the
meter and carefully replace the 3 AA batteries lo-
cated in the battery compartment, while paying
attention to their polarity. Reattach the back mak-
ing sure that the gasket is in place and tighten the
4 screws to ensure a watertight seal.