9
Securing Collar
Shroud
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Caution. Cable should be of circular cross-section and
of sufficient diameter to effect a seal inside the cable
glands.
4.1 Connection to the Dissolved Oxygen Transmitter
Note. With floating ball and dip systems sufficient
spare cable should be provided for manipulating the
floating ball system if space is restricted when installing
the interconnection cable between the floating ball and
the transmitter.
Connect the cable (supplied permanently attached to the
system) to the transmitter unit as detailed in the associated
transmitter operating instructions, using the terminal
sleeve colors to correspond with those in the operating
instructions. For convenience, Tables 4.1 and 4.2 detail the
connections to transmitters 4640 and 4645 respectively.
4.2 Calibrating the Sensor – Fig. 4.1
The procedures for zero and span calibration are fully described
in the 4600 Series Transmitter Unit Operating Instructions, to
which reference should be made.
Note. It is advisable to switch off the water wash before
starting the calibration procedure. This can be done
either by turning off at the 4600 transmitter unit, or by
disconnecting the quick-fit connector.
1) Remove the system from its mounting bracket.
2) If the system is a floating ball type, unscrew the securing
collar and remove the ball – Fig. 4.1.
3) Carefully wash the exposed sensor capsule with clean
water.
4) If the system is a floating ball type, fit the shroud, provided
with the system, to protect the sensor capsule – Fig. 4.1.
5) Calibrate as instructed in the 4600 Series Operating
Instructions.
6) If the system is a floating ball type, remove the protective
shroud after calibration and replace the ball – Fig. 4.1.
7) Re-enable the water wash if applicable.
Regular maintenance is limited to periodic cleaning and
calibration.
The sensor capsule is replaced whenever the existing one
becomes exhausted – see Section 5.1 Replacing the Oxygen
Sensor Capsule. Typical sensor life is approximately 12
months.
Table 4.1 Connections to the 4640 Dissolved Oxygen
Transmitter
Table 4.2 Connections to the 4645 Dissolved Oxygen
Transmitter
Fig. 4.1 Floating Ball Shroud for Calibration
4 ELECTRICAL INSTALLATION
