Pr
o
Minent
®
Page 63
8.4.3
DULCOMETER
®
D1C and DULCOTEST
®
CDP Chlorine Dioxide Sensor,
Troubleshooting
Controller
*depending on whether „Alarm on“ or „Alarm off“ set in „General settings“
.
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
PI-part
frozen
Stop button
Stop
Stop
Stop
No
Relay drops out
–
During calibration of sensor
Basic load
Stop
No
No error processing of
–
measured variable
Sensor slope too low
Slope ClO
2
low
25% > sensor of slope
Check sensor,
Sensor slope too high
Slope ClO
2
high
Basic load
Stop
No
> 300% standard slope
replace if necessary
DPD-value <2 % measuring range
DPD too low
Recalibrate after adding ClO
2
Zero point
Zero point low
Basic load
Stop
No
Signal < 3 mA
Check sensor/cable
Zero point high
Signal > 5 mA
Repeat calibration
in chlorine-free water
During servomotor setting
Position feed back wrong
Direction check
Without correct
Check connection of relay,
Upper position <40 % max. value
Final value small
adjustment the last
potentiometer
Lower position >30 % range
Final value big
valid values are still used
Adjust the operation region
of the servomotor correctly
Fault
Fault text
Symbol
Effect
Alarm with ack- Remarks
Remedy
on metering on control
nowledgement
Measured value
Checkout time
Check ClO
2
sensor
Basic load
Stop
Yes
Function defeatable
Check function of sensor
measured value exceeded
exceed checkout time
Signal exceeded/drops below
Check ClO
2
input
Basic load
Stop
Yes
Signal <3.0 ±0.2 mA
Check sensor, transducer and
value
or >23 ±0.2 mA
cable connection
Calibration sensor with error
Check ClO
2
calibration
Basic load
Stop
No
Metering continues in
Check sensor,
case of error with un-
replace if necessary,
steady measured values
recalibrate if necessary
Correction variable
Pt100-signal
>138.5
Ω
Signal exceeds/
Temp. input
Basic load
Stop
Yes
signal <3.0 ±0.2 mA
Check sensor, transducer
drops below value
or >23 ±0.2 mA
and cable connection
Last valid value is reused
Feed forward control
Signal <3.8 ±0.2 mA
Check sensor, transducer
Signal exceeded/
Check feed forward
Yes
or >23 ±0.2 mA
and cable connection
drops below value
input
Value last valid is used
Limit transgression
ClO
2
limit 1
Function defeatable
Defi ne cause, reset
after checkout time limit value
ClO
2
limit 2
values if necessary
Control ”on“
Yes
Control ”off“
Stop or
Stop
Yes
Basic load
Servomotor
Position not reached Servomotor defective
Yes
Servomotor closes
Check servomotor
Electronics error
System error
Stop
Stop
Yes
Elektronic data defective
Call in service
Chlorine Dioxide Sensor CDP
BA_DR_002_02_09_GB_Cooling.indd 63
BA_DR_002_02_09_GB_Cooling.indd 63
24.02.2009 11:56:07 Uhr
24.02.2009 11:56:07 Uhr