Pr
o
Minent
®
Page 31
Free Chlorine
8.1.3
DULCOMETER
®
D1C and DULCOTEST
®
CLE Chlorine Sensor for
Free Chlorine, Troubleshooting
Controller
Operation
Note text
Symbol
Effect
Alarm with ack- Remarks
Remedy
on metering on control
nowledgement
Pause contact
Pause
Stop
Stop
No/Yes*
No further fault check
–
Pause/Hold
Unchanged
**
No
–
–
Stop button
Stop
Stop
Stop
No
Relay drops out
–
During calibration
Basic load
Stop
No
No error processing of
–
measured
variable
Sensor slope too low
Slope Cl low
Basic load
Stop
No
25 % > sensor slope
Check sensor, replace
Sensor zero point too high
Slope Cl high
> 200 % of norm slope
if necessary
Zero point too low
Zero point low
Basic load
Stop
No
Zero point <3 mA
Recalibrate in sample water
Zero point too high
Zero point high
Zero point >5 mA
without chlorine
DPD-value <2 % measuring range
DPD > x.xx ppm
No
25 % > sensor slope
Recalibrate
> 200 % of norm slope
Buffer distance too small
Buffer distance
Recalibrate
too small !
Δ
buffer >2 pH !
Sensor zero point too low
pH zero point low
Sensor zero point too high
pH zero point high
Check
sensor,
Sensor slope too low
pH slope low
Basic load
Stop
No
replace if necessary
Sensor slope too high
pH slope high
Probe signal too unstable
Measured value
unstable
During servomotor setting
Position feedback wrong
Direction check
Without correct
Check connection
Upper position <40 % max. value
Final value small
adjustment the last
of relay, potentiometer
Lower position >30 % range
Final value big
valid values are still used
Adjust the operation region
of the servomotor correctly
* depending on whether “Alarm on” or “Alarm off” set in “General settings”
** Function PI stable
Fault
Fault text
Symbol
Effect
Alarm with ack- Remarks
Remedy
on metering on control
nowledgement
Measured value
Checkout time exceeded
Check Cl sensor
Basic load
Stop
Yes
Function detachable
Check function of sensor,
exceed
checkout
time
Signal exceeded/drops below value
Check Cl input
Basic load
Stop
Yes
Signal <3.0 ±0.2 mA
Check sensor, transducer and
or >23 ±0.2 mA
cable connection
Calibration sensor with error
Cl calib.
Basic load
Stop
No
Metering continues in
Check sensor, replace if
defective
case of error with
necessary, recalibrate
unstable measured values if
necessary
Correction variable
Signal exceeded/drops below value
Check feed
Basic load
Stop
Yes
Signal <3.0 or >23 mA
Check sensor, transducer and
forward input
Value last valid is used
cable connection
Calibration pH with error
pH calibration
Basic
load
Stop
Yes
faulty
Limit CLE
pH limit 1/2
Basic load
Stop
Yes
pH <5 >8.5
Limit CGE/CTE
pH limit 1/2
Basic load
Stop
Yes
pH <5 >9.5
Feed forward control
Signal exceeded/drops below value
Check feed forward
Yes
Signal <3.8 ±0.2 mA
Check sensor, transducer and
input
or >23 ±0.2 mA
cable connection
Signal exceeded,
Stop
Value last valid is used
multiplicative
Limit transgression
Cl limit 1
Function detachable
Determine cause, reset
after checkout time limits
Cl limit 2
values if necessary
Control “on”
Yes
Control “off”
Stop or
Stop
Yes
Basic load
Servomotor
Servomotor
Position not reached
defective
Yes
Servomotor closes
Check servomotor
Electronics error
System error
Stop
Stop
Yes
Electronic data faulty
Call in service
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24.02.2009 11:56:04 Uhr
24.02.2009 11:56:04 Uhr
