13.5
Troubleshooting
Left LED (sensor LED)
Colou
r
Flash code
Cause
Consequence
Remedy
red
lit
Electronics fault
Sensor faulty
Return the sensor or
contact customer
service
red
flashing*
Start phase
no transmission of
measured value
wait briefly
red
flashing slowly**
Calibration is faulty
Measured value is
incorrect
Re-calibrate
red
Double
flashing***
0 ppm > measured
value > 10 ppm
Measured value too
high/too low
Use DPD to check the
concentration in the
sample water
Clarify cause; possibly
set new values
Measured value <>
Limit value
Limit value trans‐
gression
No pH correction
value transferred
pH correction value
missing
Check parameters and
configuration. Check
pH sensor
green lit
No device error
pending
Normal mode
sensor
-
-
off
No supply voltage
Sensor not func‐
tioning
Check cable connec‐
tions
A2658
Fig. 7: Blink code explanation
‘Left LED (sensor LED)’ on page 75
DULCOTEST
®
sensor with CAN connector
75
