Thermo Fisher Scientific pHScan 3-3+ User Manual

Open this leaflet for calibration/testing/maintenance
instructions.

Electrode Maintenance

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

• Periodic soaks in warm pH 4.01 buffer will help
remove contaminants.

• If possible, keep a small piece of paper or sponge
in the electrode cap – moistened with clean water
or electrode storage solution (NOT deionized
water) and close the cap over the electrode.

When you need a new electrode, see “Electrode
Replacement” on insert in back of box.

Changing Batteries

1. Open battery
compartment
lid (with
attached
lanyard loop).

2. Remove old
batteries;
replace with
fresh ones.
Note polarity
(shown in Diagram 1).

+

Diagram 1

Self-Diagnostic Messages

bAt Weak batteries – replace with fresh ones
specified by manufacturer.

Er1 Wrong or bad buffer value, or electrode is not in
contact with solution, or electrode is failing.

Or, Ur Over r ange / under range signal, or electrode
is not in contact with solution, or electrode is failing.

Warranty

Eutech Instruments warrants its meter free from
manufacturing defects for 2 years and electrode
module for 6 months. If repair, adjustment or
replacement is necessary and has not been the result
of abuse or misuse within the time period, please
return the tester – freight prepaid – 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 Eutech’s
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 improvements in
design, construction and appearance of products
without notice. Prices are subject to change without
notice.

• Waterproof & Floats

• Replaceable Double

Junction Electrode

• NIST or USA Buffer
Selection

WP pHScan 3 Instructions

Before You Begin

Remove electrode cap. To condition electrode,

immerse electrode in electrode solution, buffer

or tap water for at least 30 minutes. DO NOT use

deionized water

Calibration

Calibration should be done regularly, typically

everyday that the tester is used. You can calibrate
at up to three points (pH 4.01, 7.00 and 10.01

or 4.01, 6.86 and 9.18).

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

2. Dip electrode about 2 to 3 cm into pH buffer

solution.

3. Press CAL button to enter Calibrate (CAL)
mode. ‘CAL’ flashes on the display. Then, a

pH value close to the pH buffer value will

flash repeatedly.

To abort calibration, press CAL again to

resume measuring mode.

4. After about 2 minutes when the
reading has stabilized, 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.

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 for about 2 minutes when the

reading has stabilized, press the

HOLD/CON.

Failure to re-hydrate the
electrode. A dry electrode will give

fluctuating readings while it

re-hydrates in a buffer, causing error.

Buffer Set Selection

To choose USA (4.01, 7.00, 10.01) or NIST (4.01,

6.86, 9.18) buffers.

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

2. The display will show “bUF” flashing.

3. Press HOLD/CON key. The display will show

either “USA” or “NST”.

4. Press CAL key to toggle between USA and NIST
buffer sets.

5. Press HOLD/CON key to confirm.

pH Testing

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

2. Dip the electrode about 2 to 3 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 turn off tester. If you do not
press a button for 8.5 minutes the tester will
automatically shut off to conser ve batteries.

Reset To Factory Default

You can reset calibration data to factory default
settings. This is extremely useful when you want to
take a new set of pH measurements or when using
a new replacement electrode.

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

2. The display will show “rSt” flashing.

3. Press HOLD/CON key to confirm. The display

will flash “YES” for 2 seconds and the tester will
go back to measurement mode.

4. To exit without confirmation, press CAL key. The
display will flash “NO” for 2 seconds and the
tester will go back to measurement mode.

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