NAVI D-25 Instruction Manual page 180

● The measured value is blinking
D-52/53/54/55
The pH value exceeds the measurement range (when
pH value is displayed).
Measurement range: pH 0.00 – pH 14.00
The mV value exceeds the measurement parameters
(when mV value is displayed).
Display range: ±1999 mV
The ION measurement value is out of the range (in the
ION mode).
Display range: 99.9 or above
The measured
measurement parameters (when conductivity value is
displayed).
Display range: 0.00 – 19.99 (when cell constant is 100
-1
m )
The measured DO value exceeds the measurement
parameters (when DO value is displayed).
Display range: 0.00 – 19.99
Cause
The sample
solution is
inappropriate.
The liquid
junction is not
immersed in the
sample solution.
The electrode
cable has been
severed.
The main body
of the pH meter
is defective.
The meter has
not been
calibrated or it
has been
calibrated
incorrectly.
6 Maintenance and Troubleshooting
conductivity value
How to solve problem
Change to a sample solution with
properties within the measurement
range.
Immerse the electrode in the
sample solution all the way until the
liquid junction or deeper.
Replace the electrode.
Check the point described below.
Calibrate the meter correctly.
6.5 Troubleshooting
exceeds the
169