Thermo Fisher Scientific CyberScan pH 300/310 - Manual (Page 43)

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9 T R O U B L E S HO O T I NG G UI D E
Problem Cause Solution
Power on but no
display a). Batteries not in place
b). Batteries not in correct polarity (+
and – position).
c). Weak batteries
a). Check that batteries are in place and
making good contact.
b). Re-insert batteries with correct
polarity.
c). Replace batteries or attach optional
AC adapter.
Unstable readings a). Air bubbles in probe.
b). Dirty probe.
c). Probe not deep enough in sample.
d). External noise pickup or induction
caused by nearby electric motor.
e). Broken probe.
a). Tap probe to remove bubbles.
b). Clean the probe and re-calibrate.
c). Make sure sample entirely covers the
probe sensors.
d). Move or switch off interfering motor.
e). Replace probe. See the
Accessories section, page 43.
Slow response a). Dirty / Oily probe. a). Clean probe. See “Probe Care &
Maintenance”, page 38- 39.