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3.2 Mounting the Enclosure
The
miniCHEM-Redox
can be wall-mounted with 3 screws. Two mounting
points are located underneath the terminal cover, and are positioned so that they
do not affect the waterproofing of the enclosure. The third mounting point is
centrally located near the top of the rear of the enclosure, and has been designed
to hook over a screw-head. The dimensions for the mounting screw centres are
provided on the rear of the enclosure. The last page of this manual may be
photocopied or removed for use as a drilling template.
3.3 Mounting the Sensors
Mounting the sensors is a very important aspect of the installation, and is often
done incorrectly. In automatic control situations, the sensors should always be
mounted as close as possible to the injection point. This will cause the sensors to
detect the added chemicals immediately, and shut the addition off until mixing
has taken place. For in-line mounting, it is important that chemicals are injected
upstream. Additionally, the line must be run through a mixing chamber, such as a
large drum, to ensure that the injected chemical has mixed in properly by the time
the solution flows past the sensors. There must always be adequate flow of fresh
sample past the sensor, for accurate monitoring. The diagrams below show typical
mounting arrangements for “dip” mounting and in-line mounting.
Dip Mounting
In-line Mounting
1. Injection point close to sensor.
1. Injection point upstream from
2. Submersible housing to protect
and close to sensor.
sensors and waterproof rear of
2. Mixing container after injection
cable (part no 111303).
and before sensor.
3. Continuous stirring.
3. Redox sensor mounted as close to
vertical as practical.
