Troubleshooting - ProMinent DULCOTEST CGE 2-mA-2 ppm Instrucciones De Servicio

Troubleshooting

8 Troubleshooting
Fault Possible Cause
Sensor cannot
Run-in period too short
be calibrated –
Membrane cap damaged
readings from
measuring
Contaminants in the water (see
device/
"cross sensitivity" in chapter 15
controller
"Technical data")
higher than
Short circuit in the leads
DPD-1
calibration
DPD chemicals too old
pH value < 5.5
Run-in period too short
Sensor cannot
be calibrated –
Coating on membrane cap
readings from
measuring
device/
Flow of water sample too low
controller
lower than
Air bubbles on outer part of
DPD-1
membrane
calibration
Surfactants in the water
(membrane is transparent)
pH value > 9.5
No electrolyte in membrane cap
Electrolyte forced into water sample
by gas bubbles
Reading is Chlorine content below lower
"zero"
measuring range limit
Sensor connected to controller
incorrectly
Run-in period too short
Sensor defective
Air bubbles on outer part of
Reading is
membrane
unstable
Membrane damaged
Fault with controller
28
Action
S See chapter 7.1 "Run-in period"
S Replace membrane cap, break in
sensor, calibrate
S Examine water for contaminants
and take action
S Trace short circuit and eliminate it
S Use new DPD chemicals, repeat
calibration
S Increase pH value to 5.5-9.5
S See chapter 7.1 "Run-in period"
S Remove coating (see chapter 9
"Maintenance"), replace membrane
cap, run in sensor, calibrate
S Correct flow (see chapter 15
"Technical data")
S Remove bubbles by tapping and
increase flow if necessary
S Eliminate surfactants and replace
membrane cap, break in sensor and
calibrate, use CDP sensor if
necessary
S Reduce pH to 5.5-9.5
S Pour in fresh electrolyte (see ch. 5
"Assembly", ch. 7.1 "Run-in period"
and ch. 7.2 "Calibration")
S Consult ProMinent
S Add chlorine and repeat calibration,
use a suitable sensor
S Connect sensor correctly
S Run for at least 3 h before calibration
S Replace sensor
S Remove bubbles by tapping and
increase flow if necessary
S Replace membrane cap, break in
sensor, calibrate
S Repair the fault
ProMinent ®