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ThermoWorks, Inc.
1762 W. 20 S. #100
Lindon, UT 84042
ph: 801-756-7705
www.thermoworks.com
8689 pH Meter
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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
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Loosen
old
It is recommended
the meters
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C
s
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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.
Remove the cover
from the bottom
of meter to expose
the electrode.
1
Electrode cap
2
4
If the cap is too
tight, use pliers to
bracket the cap and
rotate to remove.
Don’t break the cap.
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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.
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After re-calibration, checking probe slope
and offset value may help to confirm
While
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Before calibration, it is recommended that
you RESET the meter to delete all old
calibration information.
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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.
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-pH3.00~5.00
-pH6.00~8.00
-pH8.50~10.50
The acceptable pH buffer range:
6. If the probe successfully
recognizes the buffer, the
buffer pH value and “CAL”
will stop flashing.
If your calibration buffer is not NIST,
press " " or “ “ to
3.00 to 5.00,
6.00 to 8.00, 8.50 to 10.50.
adjust the
calibrating point to the corresponding
buffer value of specific temperature. The
adjustable range is :
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.
9
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.
7.
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It is recommended to change the
probe when:
a
Step 1: Loosen the washer
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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.
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The reading is constant
5) Move to another room and try again.
Solution: Power on meter four times,
Solution: Power on meter four times,
Solution: Power on meter four times,
Check whether the reading is on HOLD
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o o o
Operating Temp.: 0 ~50 C (32~122 F)
Operating Humidity: 0~80% RH
pH calibration buffer suggested:
─ Standard USA buffers
― Standard NIST buffers
― Standard DIN buffers
Battery Life: >200 hrs continuous use
SPECIFICATION
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SPECIFICATIONS
8688
0.2pH
●
●
0.1pH 0.01pH
176mm(L)x39mm(W)x39mm(T)
8689
●
●
●
●
●
●
●●●●●
●
2.0-12.0 0.0-14.0 0.00-14.00
O
+ 1 C
O
+ 0.5 C
_ _
0.05pH
O O
0.1 C/ F
Accu racy +
Cal. Point (4 .7.10 )
Auto Power Off
Meas ureme nt range
Temp. Ac curac y
Temp. R esolu ti on
Reso lutio n
Hold Data
Unit C/F swit chabl e
o
ATC (0~5 0 C)
Auto recog ni ze
Wat erpro of (IP65 )
Size
8687
0.3pH
●
●
0.1pH
●
●
●
-
O
+ 1 C
_
O O
0.1 C/ F
O O
0.1 C/ F
●
●
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CONTACT
ThermoWorks, Inc.
1762 W. 20 S. #100
Lindon, UT 84042
ph: 801-756-7705
fax: 801-756-8948
www.thermoworks.com
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