Thermo Fisher Scientific Eutech COND/TDS/Salt 6 Plus - Manual (Page 29)

Instruction Manual COND 6+, TDS 6+, SALT 6+
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7. TROUBLESHOOTING
Problem Cause Solution
No display
Batteries are not installed,
were improperly installed, or
are too weak Install batteries with correct + / -
polarity. Replace with new
batteries
“LO” displays in
the LCD
Low battery Replace batteries
Unstable
readings
a) Air bubbles in probe
b) Dirty
probe
c) Probe not immersed
enough
d) External noise pickup
or induction caused by
nearby electric motor
e) Broken probe
a) Tap probe to remove bubbles
b) Clean probe & recalibrate
c) Make sure sample entirely
covers the probe sensors
d) Move or switch off interfering
motor
e) Replace probe
Slow response Dirty / Oily probe Clean & recondition probe
Inaccurate
readings / can’t
calibrate
Probe guard not installed or
calibration solution incorrect Install probe guard & replace
calibration solutions
“Er1”
COND 6+
TDS 6+
Attempted calibration value
was not within the ±40%
auto calibration window
Check the value of the conductivity
calibration solution.
Switch to manual calibration mode
and re-calibrate
“Er1”
SALT 6+
Salinity calibration error–
CAL key was pressed in
Under range “Ur” or Over
range “Or” condition
Immerse the probe in a calibration
solution between 1.0 - 50 ppt
“Er2”
Temperature
calibration error
Auto calibration was not
within (0 – 50 °C)
temperature range
Ensure that the temperature is
within the acceptable range