Troubleshooting - ProMinent DULCOTEST CLE 3.1-mA Instrucciones De Servicio

8

Troubleshooting

Fault Fa Fa Fa Fa Possible cause
The sensor
Run-in period too short
cannot be
Membrane cap damaged
calibrated -
measuring
Interference from water
device/
contaminants (see 15 Technical
controller
data, "Cross-sensitivity")
display value is
Short circuit in signal cable
than
greater
DPD-1
DPD-chemicals spent
measurement
pH-value < pH 5.5
Run-in period too short
The sensor
cannot be
Membrane cap deposits
calibrated -
measuring
device/
Sample water flow inadequate
controller
display value is
Air bubbles on the outside of the
than
smaller
membrane
DPD-1
Surfactants in water (membrane is
measurement
transparent!)
pH-value > pH 8.0
No electrolyte in membrane cap
Electrolyte displaced by gas
bubbles in the sample water
Measured Only bound chlorine present
variable value
is "zero"
Chlorine content below the lower
measuring range limit
Sensor incorrectly connected to
controller
Run-in period inadequate
Sensor defective
Measured Air bubbles on the outside of the
variable display
membrane
unstable
Membrane damaged
Cause lies with the controller
ProMinent ®
Troubleshooting
Remedy
S See 7.1 "Run-in period"
S Replace membrane cap.
Allow sensor to run in, calibrate
S Identify interfering contaminant and
implement remedy
S Identify short circuit and repair
S Use new DPD chemicals, repeat
calibration
S Increase pH-value (pH 5.5-8.0)
S See 7.1 "Run-in period"
S Remove deposits (see 9
"Maintenance"). Replace membrane
cap. Run-in sensor, calibrate
S Increase flow (see 15 "Technical
data")
S Tap to remove air bubbles and in
crease flow if necessary
S Remove surfactants and replace
membrane cap, run in sensor and
recalibrate. If nec. use CDP sensor
S Lower pH-value (pH 5.5-8.0)
S Add new electrolyte (see 5
"Assembly", section 7.1 "Run-in
period" and section 7.2 "Calibration")
S Consult ProMinent
S If chloramine is present (DPD-4 test),
replace water or chlorinate
S Add chlorine and then repeat
calibration or use appropriate sensor
S Connect sensor correctly to
controller
S Run in for at least 3 h
S Replace sensor
S Tap to remove air bubbles and
increase flow if necessary
S Replace membrane cap. Run-in
sensor, calibrate
S Identify cause and remedy
29