Ponpe 8680 User manual

OPERATION MANUAL
PEN TYPE
PH METER
Model:
8680
8681
8682

INTRODUCTION
Congratulations on your purchase of
this pen type pH meter. Please read the
manual completely before using the meter.
Filing and keeping this manual for future
reference. Recommend to soak the
electrode for at least 30 min. before using,
especially if the electrode dries out.
Features:
IP67 Waterproof housing.
Dual display pH with ATC (8681/8682).
Data hold to capture readings.
Pen size, easy to fit in pocket.
Low battery indicator.
Disable power off.
C/F unit switchable(8681/8682).
No tools needed for calibration.
Easy to replace with 4pcs LR44 BAT.
Calibration up to 3 points.
One touch only for auto-calibration.
1
INSTALL BATTERY
Before power on, be sure to install the
batteries.
1. Loose the battery cover two screws.
(DON'T discard the small washer!)
2. Insert 4pcs LR44 batteries and make
sure polarity is correct.

CONTROLS AND INDICATORS
Model:8680
CAL
HOLD
-CAL=Calibration mode
-HOLD=Hold current value
Model:8681
ATC
CAL
F
C
Model:8682
ATC
CAL
F
C
-The 1st display shows the measured pH reading.
-The 2nd display shows the reading of temp.
-
Auto Temp. Compensation
CAL=Calibration mode
-ATC=
Keypad for 8680
Keypad for 8681/8682
MATERIAL SUPPLIED
This package contains:
The meter x 1
LR44 button battery x 4
Operation manual
Color box
2
LCD display

1. Remove the outer cover & inner caps
from the bottom of meter to expose the
electrode out. It is normal if you find
white crystals are present on the cap
or electrode assembly.
WARNING: Please always make the
sponge wet to keep the electrode is
in a good storage condition.
3
OPERATION
Remove the outer
cover & inner caps
from the bottom of
meter to expose the
electrode out.
Electrode
(sensor/probe)
2. Dip the electrode into the test solution.
Press " " and stir it to get a stable
reading.
3. A small dot " " is flashing while the
meter is in measuring mode. In 8681/
8682, the screen not only shows pH
value but also displays temperature.
o o
The temp. unit could be C or F.
(8680)

HOLD
" "
4. Press button to freeze current
reading. In 8680, the text "HOLD" will
appear on the LCD and the small dot
will not flash. In 8681/8682, the small
dot will not flash. Press " " again to
release the hold mode.
(8680)
(8681) (8682)
5. Turn off the meter by pressing " "
button.
6. Cover with the cap to store the pH pen
o
under the temperature 0~50 C.
7. To do 3 points calibration before
measurement, see page 5.
4
This meter will shut off automatically in
approx. 20 mins after stopping pressing
any key. For operating over longer periods
of time, you can disable the sleep mode.
" "
Before power on, pressing " " and
keys simultaneously until a "n" appeared
on the screen. "n" appear for 1second and
then release keys to return to normal mode.
Note: The disable sleep mode will be
invalid after every power off.
Fig. A(8680)
AUTO POWER OFF
(SLEEP FUNCTION)
Fig. B(8681/8682)

5
8681 and 8682 are capable of measuring
with Automatic Temperature Compensation.
"ATC" shows under "CAL" at the left corner
of the screen. To select the temp. unit
o o
(C or F) preferred, turn off the meter first.
AUTOMATIC TEMPERATURE
COMPENSATION (ATC): ONLY
FOR 8681/8682
While the meter is off, press " " and
o o
" " at the same time until the C or F
appeares on the LCD. Press " " to s elect
the preferred unit and then press " " to
save. " " will appear on the LCD for one
second and then back to normal (Fig.C&D)
CC
Fig. C Fig. D
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 " " (8681/8682) or " "
(8680) to enter pH calibration mode.
The text "CA"( or CAL, only for 8682)
will appear on the LCD for one second
(Fig.E) and then text "CAL" and solution
pH value (4,7 or 10) will be displayed on
the LCD. (Fig. F&G)
Calibration is necessary and should be
done regularly, recommend everyday if
the meter is used often. The unique
calibration design of the meter features
automatic buffer recognition to avoid errors.
CALIBRATION MODE (CAL)

6
3. If probe or buffer is in error
If the buffer is incorrectly inserted or
the probe is damaged or the probe
could not detect buffer in below voltage
range, the meter will escape calibration
mode automatically 10 seconds after.
Text "En" (8680/8681) or "End"(8682)
will appear on the LCD in one second
and then back to normal status. (Fig H)
Fig. H
(8680)
PH 4.00 : 97mV..... 250mV
PH 7.00 : - 60mV..... 60mV
PH10.00 : - 250mV..... -97mV
Fig. F(8680)
Fig.G (8682)
ATC
CAL C
Fig. E
CAL
4. 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.
(Fig.I)
Fig.I
(8681)
Fig.J
(8682)
If the calibration buffer is not 4,7,10 but
another value, such as 4.01, just
press " " to change the value.
(Fig. J)
ATC
CAL C
ATC
CAL C

7
6. To save the calibration value
When the electrode reads a stable value
and the user stops pressing any keys,
the meter will automatically save the
value (Fig. K) and then escape the
calibration mode. (Fig L&M)
Fig.K (8680)
7. Rinse the probe with de-ionized water
or a rinse solution (tap water...) after
each measurement to last the meter's
life.
8. Repeat above steps until the 3 points
calibration are finished
5. 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
REPLACING THE BATTERY
Replace your batteries when:
The readings on the LCD are flashing
(for 8681/8682).
The battery symbol appear on the LCD
(for 8680)
The meter could not power on.
Even if the battery was recently replaced,
check its voltage level if you get no
response from your instrument.
Fig.L(8680)
Fig.M (8682)
To replace the battery:
1. Remove the screws from the battery
cover.
2. Replace the old batteries with four new
button cells Lr44.

8
Always rinse the pH electrode and
in de-ionized water or rinse solution
(tap water......) before next use.
Never touch or rub glass bulb for
lasting pH electrode life.
Please always keep the pH glass bulb
wet by using the cap to protect and
store the electrode.
MAINTENANCE
Remove battery from instruments that
you do not plan to use for a month or
more. Do not leave battery in instrument.
3. Make sure the batteries are in place
and the polarity is correct.
4. Put back the battery cover & washers
and then screw the cover tightly to
make it as water resistant.
NOTE:
Power on but no display
Check the batteries are in place and
make good contact and correct polarity.
Replace a new battery and try again.
Slow response
Clean probe by immersing the electrode
in tap water for 10-15 minutes, then
rinse thoroughly with distilled water
or use a general purpose electrode
cleaner.
TROUBLESHOOTING
- - - .
Out of pH range, too acidic/or
too alkaline. (See Fig. L)
SPECIFICATION
8680 8681 8682
2-12 0-14 0-14
pH range

9
Fig. L (8682)
o o o
Operating Temp.: 0 ~50 C (32~122 F)
Operating Humidity: 0~80% RH
Calibration buffer solution suggested
─ Standard USA buffers
─ Standard NIST buffers
─ Standard DIN buffers
OPERATING CONDITIONS
It is normal when the electrode was
not immersed in the water but
exposed in air.
pH value fluctuate quickly
ATC
C
"H." Or "L."
Out of temp. range, too cold/or
too hot. (See Fig. M)
Fig. M (8682)
SPECIFICATION
8680 8681 8682
0 ~50
Temp. Range
CC
WARRANTY
The meter is warranted to be free from
defects in material and workmanship for
a period of one year from the date of
purchase. This warranty covers normal
operation and does not cover battery ,
misuse , abuse , alteration , tampering ,
neglect , improper maintenance , or
damage resulting from leaking batteries .
Proof of purchase is required for
warranty repairs . Warranty is void if the
meter has been opened .

RETURN AUTHORIZATION
Authorization must be obtained from the
supplier before returning items for any
reason . When requiring a RA (Return
Authorization) , please include data
regarding the defective reason, the
meters are to be returned along with
good packing to prevent any damage in
shipment and insured against possible
damage or loss .
10
SPECIFICATION
0.3pH
SPECIFICATIONS
8680 8681
Accuracy +
Cal.Point(4.7.10)
Auto Power Off
pH range
Temp. Accuracy
Temp. Resolution
Resolution
Hold Data
Unit C/F switchable
Range ( minimum) pH
Range (maximum) pH
(ATC)
Self-Calibration
Waterproof (IP67)
Size
0.2pH
● ● ● ●
0.1pH 0.01pH
●
0.0
12.0 14.0
2.0
150mm(L)x36mm(W)x25mm(T)
-
8682
0.05pH
● ●
0.1pH
●●
0.00
14.00
●●
●● ●●
●
●●
●
2-12 0-14 0-14
O
+ 1 C O
+ 0.5 C
_ _
O O
0.5 C/ F O O
0.1 C/ F
default at 25OC

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2005/03,1000
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