Hanna Instruments HI 991002 - Manual (Page 2)

To connect the probe
With the meter turned off, connect the HI1296D
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 meter ON and check 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 select the measurement range
While in normal measurement mode, press
the SET/HOLD button to select pH or mV (pH-
mV or ORP, depending on probe) measure-
ment range.
To freeze the display
While in measurement mode, press the SET/
HOLD button until HOLD appears on the second-
ary display; 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.
OPERATIONAL GUIDE METER SETUP pH MEASUREMENT & CALIBRATION
• Make sure the probe is connected.
• Set the meter to mV range.
• Place the probe into the sample to be tested.
• Stir briefly and wait until the symbol on the top
left of the LCD is turned off.
• If using supplied HI1296D probe, the meter will
show the mV value equivalent to the pH and the
temperature of the sample; if using optional
HI1297D probe, the meter will show the ORP
(mV) value and the temperature of the sample.
Note: The ORP range is factory calibrated.
Note: ATC tag turns off because the mV readings
are not temperature compensated.
ORP MEASUREMENT
BATTERY REPLACEMENT
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 tempera-
ture 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 se-
lection mode; press ON/OFF/MODE twice to re-
turn to the normal measuring mode.
• to change the calibration buffer set, after setting
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 button, then
press ON/OFF/MODE to return to normal mode.
• Make sure the meter has been calibrated before
use.
• If the probe is dry, soak it in HI70300 storage
solution for one hour to reactivate it.
• Place the tip of the probe into the sample to be
tested.
• Stir briefly 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.
• If measurements are taken in different samples
successively, rinse the probe tip thoroughly to
eliminate cross-contamination. After cleaning,
rinse the probe tip with some of the sample to be
measured.
pH calibration
• 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 appears
on the secondary LCD. If no valid buffer is de-
tected, the meter keeps the USE indication ac-
tive 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 accepts
the calibration when the reading is stable; the
meter will show on the primary display the ac-
cepted buffer, with the message “OK 1” on the
secondary display, and an audible signal is pro-
duced. After 1 second the meter automatically
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 normal
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” mes-
sage appears. The message is held for 12 sec-
onds, unless a valid buffer is recognized. If no
valid buffer is recognized, then the WRNG mes-
sage 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 normal
measuring mode.
Note: When the calibration procedure is completed,
the CAL tag is turned on.
To quit calibration and to reset to the default
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 sec-
ondary 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 af-
ter entering the calibration mode and before the
first point is accepted.
The secondary LCD displays CLR for 1 second,
the meter resets to the default calibration and
the “CAL” tag on the LCD disappears.
The meter displays the remaining battery per-
centage when turned on. When the level is be-
low 5%, the
symbol on the bottom left of
the LCD blinks to indicate a low battery condi-
tion. If the battery level is low enough to cause
erroneous readings, the Battery Error Preven-
tion System (BEPS) turns the meter off.
Unscrew the 4 screws located on the back of
the meter and carefully replace the 3 AA batter-
ies located in the battery compartment, while
paying attention to their polarity. Reattach the
back making sure that the gasket is in place
and tighten the 4 screws to ensure a water-
tight seal.