Pr
o
Minent
®
Page 43
Ozone
* If the reference electrode is of a silvery bright or white colour, it must be regenerated. Brownish-grey or
yellow-green discolourations, however, are common.
**
The
DULCOMETER
®
D1C can be used to display the sensor current for a sensor which is electrically
connected. Please read the value in the fi eld “Zero point” in the complete operating menu, see operating
instructions DULCOMETER
®
D1C, Ozone, Chapter 8 in the setting menu “Calibration ozone”. Do not
confi rm by pressing the Enter key but exit the menu by pressing the Return key.
8.2.4
DULCOMETER
®
D1C Measured Variable Ozon and DULCOTEST
®
OZE
Ozone Sensor for Ozone, Maintenance
Controller
The
DULCOMETER
®
controller type D1C for the measured variable ozone is maintenance-free.
Sensor
IMPORTANT
• The sensor is to be regularly serviced to avoid any excess metering caused by a sensor
failure!
• Observe the valid national regulations for maintenance intervals!
• Do not touch the electrodes or bring into contact with greasy substances!
Maintenance interval
Daily/weekly, depending on application
Maintenance
Work
Check the reading of the sensor at the control unit using a suitable ozone measuring tool (e.g.
DPD 4).
If required calibrate the sensor again (see Chapter “Calibration”).
Reading of the
sensor is 0 ppm
and error
message at
DULCOMETER
®
D1C
controller “Check O
3
input” is displayed
Reading of the
sensor is 0 ppm
and the sensor
current is
3.0 – 4.0 mA
Reading of the sensor
is any and the sensor
current is larger than
20 mA**
Reading of the
sensor is unstable
Correctly connect sensor to
control unit
Replace measuring line
Return sensor
Check control unit with sensor
simulator (DULCOMETER
®
Simulator, order no. 1004042),
return if faulty
Note running-in period
Check water for interfering
substances and replace water,
if required
Calibrate zero point
Return sensor for regeneration
Check system, remedy fault,
repeat calibration
Tighten diaphragm cap fully
Return sensor
Check installation site and
change, if required. Change
procedure, if required
Return sensor for regeneration
Sensor connected to the control
unit with wrong polarity
Measuring line broken
Sensor faulty
Control unit faulty
Running-in period too low
Interfering substances in water
Zero point shifted
Reference electrode faulty*
Ozone content above the upper
measuring range limit
Distance between diaphragm and
electrode too large
Sensor faulty
Pressure fl uctuations in the
sample water line
Reference electrode faulty*
Fault
Possible cause
Remedy
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