Find on wardsci.com
pH Meter
¨ Confirm the meter settings are correct.
¨ Confirm that your temperature sensor
is connected (if required).
¨ Check that the batteries and power cord
are in good working order.
¨ Check that the electrode connection
is secure.
¨ Calibrate frequently to at least 2 points
with fresh buffers.
u Replace if the meter does not turn on
or shows signs of severe wear.
Electrode
¨ Inspect your electrode cord and
connection for damage.
¨ Check that the meter connection is secure.
¨ Inspect the pH bulb for scratches.
¨ Confirm the pH bulb isn't broken.
¨ Use cleaning solution to ensure
electrode bulb and junction are clean.
¨ Use storage solution to ensure the
electrode is hydrated.
¨ Use the correct electrode type for
sample being tested.
u Replace if electrode won't stabilize,
calibrate or is broken or scratched.
pH Buffers
¨ Stir buffer with magnetic stirrer or probe.
¨ Confirm you are using the correct pH
calibration buffer.
¨ Inspect your buffers for visible
contamination.
¨ Use fresh buffer for calibration.
¨ Confirm buffer is not expired or bottle
has not been opened for more than 4–8
weeks; or 1–2 weeks for buffer > pH 7.
u Replace buffers if contamination is present,
they are expired or have been opened for
too long.
Sample
¨ Stir sample with magnetic stirrer
or probe.
¨ Confirm you have enough sample to
cover the electrode bulb and junction.
¨ Confirm the temperature of your sample
will not damage electrode.
¨ Sample is appropriate for probe type.
¨ Sample is fresh and representative of
the process/product.
+
ward
'
s
science
5100 West Henrietta Road • PO Box 92912 • Rochester, New York 14692-9012 • p: 800 962-2660 • wardsci.com
Check these elements for proper pH measurements: meter, electrode, buffer, and sample.
pH Measurement Checklist
TIP: Always remember to reference
your manual.
TIP: Place in storage solution at least
1 hour or overnight to fully hydrate.
TIP: You should "bracket" your
expected result e.g.
If the expected result = pH 5
Use buffers pH 4.01 and pH 7.01.
Electrode
pH Buffers
Sample
pH Meter
