Evoqua WALLACE & TIERNAN SFC, Original Instruction Manual

Page: 213 / 288

SFC
Operation
6.
213
6.5 Errors and remedies
Error messages
The following table shows and explains all possible error
messages which can be displayed. If several errors occur at the
same time, the corresponding messages appear alternately in
succession. When the error has been remedied, the error
message is automatically deleted.
If you are unable to remedy the error yourself, please contact your
contractual partner.
Error message Cause Remedy
Measured value
display flashes Measured value is outside the
measuring range Check measuring range and change, if
necessary. Check dosing or controller
settings
Positioner feedback
flashes Positioner in manual mode Press the adjusting knob on the
positioner
DI I flashes Sample water flow recently
insufficient (delay running), signal at
the signal input DI I Check the sample water flow rate
(approx. 33 l/h)
DI I Permanent
display Sample water flow insufficient for
some time (delay elapsed) Clean or replace the preliminary filter
Multi-sensor incorrectly connected
or defective
DI II Signal at the signal input DI II Check connection and setting
Zero ? In 3-electrode cells
Sensor has zero current > +5 µA or
< -5 µA Upot potential voltage set incorrectly;
change, if necessary
Electrodes in the 3-electrode cell are
soiled; clean and service, if necessary
Sample water is not turned off or check
valve leaks; turn off sample water, if
necessary
In membrane sensors
Sensor has zero current > +5 µA or
< -5 µA Disinfectant in water; calibrate with
disinfectant-free water, if necessary
Check sensors and replace or service,
if necessary