Pr
o
Minent
®
Page 69
Redox/ORP
8.5.2
DULCOTEST
®
Sensor for Redox/ORP, Commissioning
8.5.2.1
DULCOTEST
®
Sensor for Redox/ORP, Assembly
Assembly
Prior to commissioning, the protective cap or quiver must be removed from the glass or metal
electrode. The glass or metal electrode must be free of contaminations, oils and greases. The
diaphragm of the reference electrode must also be free of deposits, contaminations and crys tal li-
sa tions. For this reason, the electrodes should not be touched with bare hands. Should con tam i-
na tions exist, please see “Cleaning and Care” in the individual operating instructions.
8.5.2.2
DULCOTEST
®
Sensor for Redox/ORP, Electrical Installation
Electrically connect the DULCOTEST
®
sensor for Redox/ORP with the marked cable of the
respective controller D1C.
8.5.2.3
DULCOTEST
®
Sensor for Redox/ORP, Running-In
The
DULCOTEST
®
sensor for Redox/ORP must not be run-in. The DULCOTEST
®
sensor for
Redox/ORP can be readily used.
8.5.2.4
DULCOTEST
®
Sensor for Redox/ORP, Calibration
Having connected the sensor to the transmitter by means of the sensor cable (taking care that
connectors and cable remain absolutely dry), dip the sensor into a redox standardizing solution,
e.g. of 465 mV. The reading should reach or exceed this value within not more than 30 seconds.
If the reading rises rather sluggishly or falls short more than 20 mV, clean the sensor as described
and repeat check. If again unsuccessful, replace the sensor with a new one.
D1C2-011-Redox-GB
Permanent display 1
Permanent display 2
only with control
(w = setpoint)
mea. val.
fd. fwd.:
reg. val.:
750 mV
w:
750 mV
70 %
59 %
Positive values of setting variable:
Negative values of setting variable:
Oxidant agent
Reducing agent
mV
750
Checking the Redox/ORP Sensor
During calibration, the D1C sets the command outputs to “0”. Exception: if a basic load or a
manual control variable was set, these are maintained during calibration. The standard signal
outputs mA (measuring value or correction value) are frozen. The measured value or the standard
buffer value 220 mV or 465 mV is proposed as the buffer value; this value is adjustable (arrow
keys). After everything has been checked, all error tests which refer to the measured value are
restarted.
D1C2-012-Redox-GB
= automatic timing
check probe
ORP
check probe
ORP
probe in buffer
460 mV
check probe
measurement act.
please wait !
460 mV
check probe
ORP
value:
buffer:
460 mV
465 mV
Permanent display 1
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BA_DR_002_02_09_GB_Cooling.indd 69
24.02.2009 11:56:07 Uhr
24.02.2009 11:56:07 Uhr