az-instrument 8690 User manual
OPERATION MANUAL
Model: 8690
PEN TYPE
PH METER
DESIGN PATENTED:
US D453.905S
INTRODUCTION
- The primary display shows the
measured pH reading.
- The secondary display shows the
reading of temperature .
- The left corner display shows the
Calibration CAL and Auto Temperature
Compensation ATC of the reading.
- oo
Unit of C or F is displayed at the right
corner of the screen.
DISPLAY
1
ATC
CAL F
C
The meter will display all LCD segments
when it is first turned on for approx. 1
seconds.
Congratulations on your purchase of
the unique shape of pH pen model
8690, the meter features dual display
pH with ATC (Automatic Temperature
Compensation ), only one touch for
o
auto-calibration, easy read by 45
angle, the pH electrode module is
replaceable.
Read completely before using the meter,
file and keep this manual for future
reference. Recommend soak the
electrode for at least 30 min. before
using, especially if the electrode dries
out between uses or after long time
unuses.
CONTROLS AND INDICATORS
1.
2.
.
Replaceable
transparent
plastic cover)
Primary Data Screen displays pH
reading, calibration value.
Secondary Data Screen displays
temperature reading.
oo o
3 C/ F Toggles display data from Cto
ooo
F or F to C.
4. pH Electrode .
5. Cover of the pH pen .
6. Glass bulb (protect by
7. Pocket clip.
8. CAL-Calibration indicator.
9. ATC-Auto Temp. Compensation.
10. Tab for releasing from the lock.
11. HOLD , UNIT selectable button.
12. CAL button.
13. Power ON /OFF button.
2
5
1
2
3
4
6
78
9
10
11
12
13
CAL
HOLD
UNIT
8690 WATERPROOF
pH
ATC
O
C
1. Remove the cap from the bottom of
the meter to expose the electrode which
is protected by a small transparent
plastic cover. It is normal if you find
white crystals are present on the cap
or electrode assembly. Rotate the small
cap in clockwise direction to expose
the electrode. DON'Tpour out the liquid
in the small cap, the liquid is used to
keep electrode wet. (See below figure.)
2.Dip the electrode into the test solution
and stir it to get a stable reading .
3.A small dot " " is flashing while the
meter is working, the screen shows pH
value and solution temperature (
oo
with unit C or F.See Fig.G.
4.Press HOLD button to freeze the
current reading.The small dot is not
flashing after pressing the button.
5.Turn off by pressing
button .
6.Todisable the sleep
mode before power
on, see the procedure
on page 4.
7. Put back he transparent
cover and gray cap to
storethe pH penunder
o
the temperature0~50 C.
ATC)
I
3
Fig. G
ATC C
2
1
ATC CC
This instrument will shut off automatically
in approx. 20 minutes for every power on.
For recording or operating over longer
periods of time, you can disable the sleep
mode by pressing and keys
at the same time before power on and
then release the power key.An "n" will
appear in the middle of the screen for
one second (See Fig.A) and return to the
normal mode. (See Fig. B) Note: The
disable sleep mode will be invalid after
power off.
The three keys of the meter enable user
to select the modes they prefer.
The display will default to the mode last
used. For your convenience, the meter
defaults to the setting used during
the last operation. The following content
lists the modes of operation that can be
activated by pressing the keys indicated.
Fig. B
Fig. A
-Turns instrument on (Default setting)
and off (See Fig. B).
-When the meter is off, press this key
and simultaneously to disable
sleep mode (See Fig. A).
-Press this key and to enter
unit setting. See the procedure in
page 5
I
HOLD
HOLD
UNIT
4
AUTO POWER OFF
(SLEEP FUNCTION)
MODE OPTIONS
I
CAL
ATC
CAL CC
FF
Fig. D
CC
Fig. C
Fig. F
ATC
CAL CC
Fig. E
-When meter is on, short press to
enter the calibration mode(Fig. F).
-When in calibration mode, skip to
next calibration point by pressing
this key.
-When metetr is off, press this key
and at the same time and then
release the to enter unit setting.
oo
Press to select C or F (Fig.D).
Then, press button to store the
unit, the display shows "SA" for one
second (See Fig.J) and then return
to the normal mode .
5
-Press this key to increase the value
when meter is in pH calibration mode.
Release the key after selecting the
correct calibration value (Fig. E).
The meter is capable of taking measure-
ments with Automatic Temperature
Compensation. "ATC" shows under
"CAL" at the left corner of the screen.
AUTOMATICTEMPERATURE
COMPENSATION (ATC)
HOLD
UNIT
CAL
HOLD
UNIT
CAL
6
Fig. H
1. Power on the meter.
2. Short press key to enter pH
calibration mode, you will first see "
4.00 " on the LCD readout. ( Fig. G ).
3. NOTE:
If the buffer is incorrectly inserted or
the probe is damaged, "CAL" will not
flash on above "ATC" .(See Fig.G )
4. After about 60 "CAL" flashes or 60 sec-
onds, the meter will automatically save
and "SA" shows for one second, then
skip to next calibration point without
pressing any button .
5. At the moment, the screen shows 7.00
(Fig.H), CAL is not flashing until you
remove the meter to the correct calibra-
tion buffer. CAL again flash repeatedly
about another 30 seconds, then save
the calibration point automatically: "SA"
shows for 1 second and skip to "10.00"
(remember to use the correct buffer),
"CAL" is flashing again .(See Fig. I )
ATC
CAL C
Calibration is necessary and should
be done regularly, recommend every
day if the meter is used very often.
CALIBRATION MODE (CAL)
CAL
Fig. K
7
6. There are 3 calibration points 4.00, 7.00
and 10.00, after completing the last
cablibration point 10.00, the meter
return to the normal mode after saving
automatically (See Fig.K) .LCD shows
"End " for a second (See Fig. IA) .
ATC
CAL CC
ATC
CAL CC
ATC CC
Fig. I Fig. IA
Fig. J
.
7. If want to calibrate "7.00" first before
"4.00", pressing to select the
desired calibration point. "CAL" is not
flashing while changing the value.
8.
The adjustable cal .
point range for 4.00 pH is from 3.50 to
4.50. Hold the cycle from 3.5 to
4.5 then 3.5 again. Release the key
when desired point is selected. The
adjustable cal. range for pH 7.00 is
6.50~7.50. For 10.00 pH range, there
are 9.50~10.5.
9. Rinse the probe with de-ionized water
or a rinse solution (tap water...) after
each measurement to lengthen the
meter's life.
The meter designs with an adjustable
calibration point to meet different
solution standard.
CAL
HOLD
UNIT
The meter features that you can replace
the electrode module when needed (see
Fig. L). Place the finger nail under the
clip, pull up the tab to release the lock,
push up the top part of the meter.
Pushing down the top part into a new
electrode, align with the internal guides
to lock the meter.
Now you have completed the electrode
replacement .
REPLACING THE BATTERY
The readings on the display are flashing .
The meter will not power on.
Even if the battery was recently replaced,
check its voltage level if you get no
response from your instrument.
To replace the battery:
1. Remove the pH electrode module as
above procedure (See Fig. L).
2. Replace the old batteries with two new
button cell CR2032 (See Fig. LA).
3. Observe polarity and put back the top
unit to the electrode module as above
procedure, too (See Fig. L ).
Remove battery from instruments that
you do not plan to use for a month or
more. Do not leave batteries in instrument.
Fig. L
ELECTRODE REPLACEMENT
8
Replace your batteries when:
9
?Power on but no display. Check the
battery are in place and making good
contact or correct polarity. Replace a
new battery.
Always rinse the pH electrode and
reference junction in de-ionized 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.
Slow response. Clean probe by
immersing the electrode in tap water
for 10-15 minutes, then thoroughly
rinse with distilled water or use a
general purpose electrode cleaner.
?
--- - . Out of pH range, too acidic/or
too alkaline. (Fig. M)
It is normal when the electrode is not
immersed in the water.
?
Fig. M
MAINTENANCE
TROUBLESHOOTING
Fig. LA
--- -
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