19
8. Troubleshooting
Problem
Cause
Solution
Power on but
a) Batteries not in place.
a) Check that batteries are in
no display
place and making good
contact.
b) Batteries not in correct
b) Reinsert batteries with
polarity (+ and –).
correct polarity.
c) Weak batteries.
c) Replace batteries or attach
optional AC adapter.
Unstable
a) Air bubbles in probe.
a) Tap probe to remove bubbles.
readings
b) Dirty probe.
b) Clean the probe and
recalibrate.
c) Probe not deep
c) Make sure sample entirely
enough in sample.
covers the probe sensors.
d) External noise pickup
d) Move or switch off
or induction caused by
interfering motor.
nearby electric motor.
e) Broken probe.
e) Replace probe. See page 22.
“OR” on upper
a) Probe is shorted.
a) Test probe. Make sure probe
display
is fully connected to meter.
b) Probe is in an
b) Use different solution.
out-of range solution.
c) Broken probe.
c) Replace probe. See page 22.
Temperature reading
a) Temperature sensor
a) Clean temperature sensor
erratic or lower
is dirty.
with isopropyl alcohol.
display reads “OR”
b) Temperature of solution
b) Heat or cool solution.
is out of range.
c) Probe is shorted
a) Test probe. Make sure probe
is fully connected to meter.
c) Broken probe.
c) Replace probe. See page 22.
Slow response
a) Dirty/Oily probe.
a) Clean probe. See "Probe
Care & Maintenance", p. 18.
18
7. Probe Care and Maintenance
Under typical operating conditions, the probe will need to be replaced every
6 to 12 months.
In extreme applications, the probe may wear out sooner. Proper
care and maintenance will help you receive the maximum probe life and ensure
more accurate readings.
Keep the probe clean. Before use, rinse the probe twice. For the best accuracy, soak
your probe in electrode storage solution, pH 4.0 buffer, or tap water for at least 5 to
10 minutes before calibration.
Gently swirl the probe in the solution while you take readings. Tap the probe gently
against the bottom and sides of your container to remove any air bubbles, which
may interfere with accuracy.
Clean the probe thoroughly by immersing it in an agitated mild detergent bath. To
clean the conductivity cell, use a cotton swab soaked in isopropyl alcohol and clean
the steel pins. Wipe the steel pins with a soft tissue paper. DO NOT wipe the pH
bulb with tissue as it may cause static build-up. After cleaning the probe, wash the
probe with deionized or tap water before storing it. Recalibrate the meter after
cleaning the probe.
Store the probe in its cap filled with electrode storage solution.
Do not strike the probe against any hard surface. Do not immerse the probe in oily
solutions.
To order a replacement probe, see page 22.
conductivity cell
pH electrode
temperature
sensor
Probe from end view
