Thermo Fisher Scientific pHScan BNC User Manual

Open this booklet for calibration/testing/
maintenance instructions.

Changing Batteries:

1. Open batter y compartment lid (with
attached lanyard
loop).

2. Remove old
batteries; replace

–

+

with fresh ones.
Note polarity
(shown in battery)

keypad

compartment and in picture at right).

3. Recalibrate tester after battery change.

Error Messages:

bAT Weak batteries – replace
Er1 Wrong or bad buffer value, or electrode

is failing.
Or, Ur Over range / under range signal, or
electrode is failing.

Warranty:

The waterproof pHScan BNC is warranted
against defects in materials and workmanship
for a period of 24 months from the date
of purchase. If repair, adjustment or
replacement is necessary and has not been
the result of abuse or misuse within the
warranty period, please return the tester –
freight pre-paid – and correction will be made
without charge. Out of warranty products will
be repaired on a charge basis.

Return of Items:

Authorization must be obtained from your
Distributor before returning items for any
reason. When applying for authorization,
please include information regarding the
reason the item(s) are to be returned. Note:
We reserve the right to make impro vements
in design, construction and appearance of
products without notice. Prices are subject to
change without notice.

68X247780 11/01 Rev 0

Microprocessor based
pH Tester that floats!

Waterproof pHScan BNC
Microprocessor-based Pocket pH Tester

Connecting your electrode:

To connect the tester to your electrode, align the

posts of the tester's BNC connector with the slots

on the electrode connector. Push together and twist
the electrode connector 1/2 turn until it clicks into
place.

Calibration:

Calibration should be done regularly, typically

every day that the tester is used. You can calibrate

up to three point. Choose buffer sets as described

above right.

1. Press ON/OFF button to switch unit on.

2. Dip electrode about 2 cm into buffer.

3. Press CAL button to enter Calibrate (CAL)

mode. 'CAL' flashes on the display. Then a

pH value close to pH buffer value will flash

repeatedly.

4. After at least 3 minutes, press
the HOLD/CON button to confirm

calibration. The display will show

'CO' and then switch to the buffer

value reading.

5. Repeat with other buffers if
necessary. Rinse electrode in tap

water before dipping into next buffer.

Calibration Troubleshooting:

Failure to press HOLD/CON to
confirm calibration (step 4 above).
Pressing the CAL button will resume
measuring mode but will not enter
the calibration value.
Insufficient sampling time. If the

tester does not have a long enough

exposure to the buffer, a stable

calibration point will not be reached.

Wait at least 3 minutes before
pressing HOLD/CON.
Failure to re-hydrate the electrode. A

dry electrode will give fluctuating
reading while it re-hydrates in a buffer,

causing errors.

Buffer Set selections:

To choose USA (pH 4.01, 7.00, 10.01) or NIST
(pH 4.01, 6.86, 9.18) buffers:

1. With tester off, hold HOLD/CON key while
pressing ON/OFF key.

2. Press HOLD/CON key again.

3. Press CAL key to toggle between USA and NIST

buffer sets.

4. Press HOLD/CON to confirm.

pH Testing:

1. Remove cap or storage bottle from the
electrode and press the ON/OFF button to
switch tester on.

2. Dip the electrode about 2 cm into the test
solution. Stir once and let the reading stabilize.

3. Note the pH or press HOLD/CON button to
freeze the reading. Press HOLD/CON again to
release the reading.

4. Press ON/OFF to tur n off tester. If you do not
press a button for 8.5 minutes the tester will
automatically shut off to conser ve batteries.

Instrument Maintenance:

• Rinse the electrode with tap water or electrode
storage solution after each measurement.

• Periodic soaks in warm pH 4 buffer will help
remove contaminants.

• When finished using electrode, fill electrode cap
with tap water or electrode storage solution and
replace cap.