8689 pH Meter
ThermoWorks, Inc.
1762 W. 20 S. #100
Lindon, UT 84042
ph: 801-756-7705
www.thermoworks.com
File and keep
It is recommended that you
before using to clear up the lazy effect
or to make the electrode wet if the pH
electrode dries out.
Check
will
Loosen
old
It is recommended
the meters
C
s
Electrode cap
Remove the cover
from the bottom
of meter to expose
If the cap is too
the electrode. tight, use pliers to
bracket the cap and
1 rotate to remove.
Don’t break the cap.
3. "pH " flashes while the meter is in
measurement mode. The LCD shows
the measured pH and temperature.
“pH” stop flash while the reading is
stable.
4. Press " " key to freeze current
readings. "HLD" appears on the LCD.
Press " " key again to release.
4
keep
This meter will shut off automatically after
20 minutes of inactivity. For operating a
longer period of time, you can disable
the sleep mode.
NOTE: The sleep mode will reset after
every power off.
After re-calibration, checking probe slope
and offset value may help to confirm
While
Before calibration, it is recommended that
you RESET the meter to delete all old
calibration information.
Caibration is necessary and should be done
regularly. It is recommended that this be
done everyday if the meter is used often.
The unique calibration design of the meter
features automatic buffer recognition to
avoid errors.
It is recommended to
calibrate pH7 first and then 4 or 10pH
for better accuracy result.
5. If the probe is damaged or the buffer is
not specified as following, the primary
LCD will keep flashing unless you escape
by turning off the meter.
The acceptable pH buffer range:
-pH3.00~5.00
-pH6.00~8.00
-pH8.50~10.50
6. If the probe successfully
recognizes the buffer, the
buffer pH value and “CAL”
will stop flashing.
7. If your calibration buffer is not NIST,
press " " or “ “ to adjust the
calibrating point to the corresponding
buffer value of specific temperature. The
adjustable range is :3.00 to 5.00,
6.00 to 8.00, 8.50 to 10.50.
8. Wait for 30 seconds, the meter completes
the calibration automatically if the reading
is stable enough.
9. Rinse the probe with de-ionized water
or a rinse solution (tap water...) after
calibration. Repeat step 3 ~ 8 to do
multiple point calibration or exit by turning
off the meter.
9
It is recommended to change the
probe when:
Step 1: Loosen the washer
to lengthen pH electrode life.
1) Make sure the duration of
pressing the power key is
more than 0.3 sec.
2) Make sure the batteries
are in place and make good
contact and correct polarity.
3) Remove batteries for one
minute and reinstall again.
5) Move to another room and try again.
The reading is constant
Check whether the reading is on HOLD
Solution: Power on meter four times,
Solution: Power on meter four times,
Solution: Power on meter four times,
SPECIFICATIONS 8687 8688 8689
+
Accuracy - 0.3pH 0.2pH 0.05pH
Cal.Point(4.7.10) ● ● ●
Auto Power Off ● ● ●
Measurement range 2.0-12.0 0.0-14.0 0.00-14.00
Temp. Accuracy _
+ 1OC +
_ 1OC +
_ 0.5OC
Temp. Resolution 0.1OC/OF 0.1OC/OF 0.1OC/OF
Resolution 0.1pH 0.1pH 0.01pH
13
Hold Data ● ● ●
Unit C/F switchable ● ● ●
― Standard DIN buffers
─ Standard USA buffers
― Standard NIST buffers
● ● ●
SPECIFICATION
ATC (0~50 o C)
Auto recognize ● ● ●
Waterproof (IP65) ● ● ●
Operating Humidity: 0~80% RH
pH calibration buffer suggested:
Size 176mm(L)x39mm(W)x39mm(T)
Battery Life: >200 hrs continuous use
Operating Temp.: 0o~50oC (32~122oF)
CONTACT
ThermoWorks, Inc.
1762 W. 20 S. #100
Lindon, UT 84042
ph: 801-756-7705
fax: 801-756-8948
www.thermoworks.com
