Pr
o
Minent
®
Page 60
8.4.2.2
DULCOTEST
®
CDP Chlorine Dioxide Sensor, Installation
IMPORTANT
• The sensor is not electrically isolated from the sample water. All other elements must be
isolated! The controller must be isolated both from the sensor and from the supply
voltage!
• The supply voltage must not fall below 16 V DC, even for a short period! The current
source must able to sustain 35 mA at a min. 16 V DC! Insuffi cient supply voltage will
result in an inaccurate reading!
• After the electrical connection of the sensor, the sensor has to be inserted into the
sample water which has to contain chlorine dioxide.
The sensor incorporates a passive 4-20 mA two-wire interface, i.e. the power supply is provided
externally e.g. via the controller.
• Safety requirements are automatically met if the sensor is connected to a ProMinent
®
con trol-
ler (e.g. DULCOMETER
®
D1C).
• Do not switch off the measuring system when in intermittent use! If necessary, dosing equip-
ment should be timer-controlled!
Electrical
Installation
Rotate the sensor adapter anticlockwise by 90 ºC and remove (bayonet fi tting).
Unscrew the PG-7 threaded connector tensioning screw and insert the signal cable leading
from the controller.
Strip the ends of the cable and attach to the two-wire connector:
1 = positive, 2 = negative
Insert approx. 5 cm of signal cable into the sensor and tighten the PG-7 threaded connector
tensioning screw.
Insert the sensor adapter completely into the housing and screw together carefully to prevent
damage to the ends of the bayonet connector.
Electrical
connection
to sensor
1 2
5 cm
8.4.2.3
DULCOTEST
®
CDP Chlorine Dioxide Sensor, Running-In
IMPORTANT
Do not switch off the measuring system during interval operation!
After operation without chlorine dioxide, running-in periods are to be reckoned with.
If required, switch on metering unit time-delayed!
If no chlorine dioxide is metered for a longer period of time, the sensor must be disconnec-
ted from the power supply and stored dry.
Running-In
Period
The sensor requires a run-in period before it will display stable readings.
Commissioning:
4 - 12 h
Re-commissioning:
2 - 4 h
Membrane-/electrolyte replacement: approx. 1 h
Chlorine Dioxide Sensor CDP
BA_DR_002_02_09_GB_Cooling.indd 60
BA_DR_002_02_09_GB_Cooling.indd 60
24.02.2009 11:56:06 Uhr
24.02.2009 11:56:06 Uhr