az-instrument 8684 User manual

OPERATION MANUAL
PEN TYPE
PH METER
Model:
8685, pH meter
8686, pH meter
8684, pH meter

INTRODUCTION
Congratulations on your purchase of
this pen type pH meter. Please read the
manual completely before using this meter.
Filing and keeping the manual for future
reference. Recommended to soak the
electrode for at least 30 min. before using
to clear up the lazy effect or to make the
electrode wet if the pH electrode dries out.
Features:
IP65 Waterproof housing.
Dual display with ATC.(except 8684)
Data hold to freeze readings.
Pen size, easy to fit in pocket.
Low battery indicator.
Auto power off.
C/F unit switchable.
Power by 4pcs LR44 batteries.
Multi points calibration.
One touch only for calibration.
MATERIAL SUPPLIED
This package contains:
The meter x 1
LR44 button battery x 4
Operation manual
Color box or plain box
POWER SUPPLY
The meter is powered by 4 pcs LR44
batteries. To check the battery when:
1. First time use
2.
3.
1
The battery symbol appears on LCD
The meter can not power on

To install the batteries:
1. Turn off the meter.
2.
3. Replace the old batteries with four new
button cells LR44.
Loose the battery cover in counter-
clockwise direction. (DON'T discard the
black washer!)
4. Make sure the batteries are in place
and the polarity is correct.
5. Put back the battery cover & washer
and turn it tightly in clockwise direction.
1. Please re-calibrate the meters after
changing batteries.
2. Remove battery from instruments
that you do not plan to use for a
month or more. Do not leave battery
in instrument.
NOTE:
2

LCD DISPLAY
8685/
8686
-The 1st display shows the measured pH
reading.
-The 2nd display shows the temp. (8685/86)
-
Auto Temp. Compensation
-Hold=Data hold
Cal=Calibration mode
-ATC=
8685/86
8684
8684/85/86
8684
KEYPAD
OPERATION
1. Remove the probe cover from meter
to expose the electrode out. For 8684
/85/86, it is n ormal if you find white
crystals are present on the c ap or
electrode assembly.
3
Hold
CAL
ATC
C
F
HoldCal

F
4
Rotate the
semi-transparent bottle a
little bit in counter-clockwise
direction and then pull out
the bottle completely to expose the electrode.
Electrode
2. Dip the electrode into the test solution.
Press " " to power on the meter
and tir it to get a stable reading.
3. For 8684/85/86, a small dot " "
is flashing while the meter is in
measurement mode. The LCD not only
shows the measured pH value but
also displays the temperature(8685/86).
8685
WARNING: For pH meters, please
always make the sponge wet to
keep the electrode in a good
storage condition.
ATC

" "
4. Press to freeze current readings.
The text "Hold" will appear on the LCD
and the small dot (8684/85/86) will not
flash . Press " " again to release the
hold mode.
5. Turn off the meter by pressing " "
button.
8686
5
7.Please see page 7 for the calibration
procedures.
6.Once finishing the measurement, clean
the electrode, put back the cap, store
o
the meter under the 0~50 C.
This meter will shut off automatically 20
minutes of inactivity. For operating longer
time, you can disable the sleep mode.
To disable the auto power off:
AUTO POWER OFF
(SLEEP FUNCTION)
Before power on, " "
pressing " " +
keys simultaneously until a
"n" appeared on the screen
and then release keys to
return to normal mode.
ATC
C
Hold

Except 8684, these meters are capable of
measuring with Automatic Temperature
Compensation. In 8685/8686, "ATC" will
show in the middle of the LCD.
AUTOMATIC TEMPERATURE
COMPENSATION (ATC) &
TEMP. UNIT SETTING
o o
To select the temp. unit ( C or F), turn off
the meter first. When the meter is off, press
" " and " " at the same time until
the C or F appears on the LCD. Press
" " to s elect the preferred unit and then
press " " to save. " " will appear on
the LCD for one sec and then go back to
normal.
Temp. Unit Setting 8685/86
6
Note: The disable sleep mode will be
invalid after every power off.
C

Calibration is necessary and should be
done regularly, recommended everyday
if the meter is used often. The unique
calibration design of the meter features
automatic buffer recognition to avoid errors.
CALIBRATION MODE (CAL)
7
1. Power on the meter.
2. Place the electrode into a buffer solution
(4,7or10), pH7 should be calibrated first
and then 4 or 10 pH for better accuracy
3. Press " " or " CAL " to enter pH
calibration mode. The text "CA" ( for
8686 is "CAL") will appear on the LCD
for one second and then pH value
(4,7 or 10) will be displayed on the LCD.
8684 /8685/8686 Calibration
8686
4. If probe or buffer is in error:
If the buffer is incorrectly inserted or
the probe is damaged or the probe
can not detect buffer in below voltage
range, the meter will escape calibration
mode automatically after 10 seconds.
Text "En" or "End" (8686)
will appear on the LCD
in one second and then
will go back to normal
status.
ATC
C
Cal

8
PH 4.00 : 97mV..... 250mV
PH 7.00 : - 60mV..... 60mV
PH10.00 : - 250mV..... -97mV
Acceptable voltage range of each point:
5. If the probe recognizes the buffer:
If the probe successfully recognizes the
buffer, the buffer pH value (4 or 7 or 10)
will appear on the display in 2 seconds.
If the calibration buffer is not 4,7,10 but
another value, such as 4.01, just
press " " to change the value.
8685 8686
7. To save the calibration value:
When the electrode reads a stable value
and user stops pressing any keys, the
meter will automatically save the value
and then escape the calibration mode.
6. The adjustable cal. point range for 4.0
pH is from 3.50 to 4.50. For 7.0 pH is
from 6.50 to 7.50. For 10.0 pH is from
9.50 to 10.50
8686 8686
ATC
C
Cal
ATC
C
Cal

9. Repeat above steps until the 3 point
calibration are finished.
9
8. Rinse the probe with de-ionized water
or a rinse solution (tap water...) after
each measurement to last the meter's
life.
Always rinse the pH electrode in
de-ionized water or rinse solution
(tap water......) before next use.
Never touch or rub glass bulb in order
to last pH electrode life.
Please always keep the pH glass bulb
wet by using the cap to protect and
store the electrode.
MAINTENANCE
Make sure the electrode is clean.
Between measurements, rinse the
electrode with deionised water. If
the eletrode has been exposed to
a solvent immiscible with water,
clean it with a solvent miscible with
water e.g. ethanol or acetone and
rinse carefully with water.
Store the electrode carefully.