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4.16.2
Setup of a (pressure) Safety Override for Time Control
When time control is exclusively selected, a
Safety Override control is made available.
To use this feature, a Sentinel2 model with a
pressure transducer for monitoring the
downstream pressure is required to be
installed.
The control can be disabled or enabled.
When enabled fill in the threshold settings and required action.
e.g., With the settings shown above, the system may have been set up with a Low PRV
pressure mechanically set to 25m. If the pressure downstream of the PRV falls below
20m for a period of more than 10 minutes the actuator will override to the High
Pressure setting.
Example uses:
•
If a fire hydrant is used whilst pressure is set to Low, the pressure may drop due
to demand. Therefore, over-ride to High pressure.
•
If a water mains burst occurs whilst pressure is set to High, the pressure may
drop due to water loss. Therefore, over-ride to Low pressure.
4.16.3
Setup of pressure control using a Flow profile
To use a pressure profile that is based on
F
low, tick the “
Flow
control” option.
To use this feature, the Sentinel2 digital flow
interface (meter pulse collection) is required
to be connected to the meter-pulse output of
a meter within the downstream side, close to
the PRV.
…
A
“
Flow Control
Settings”
panel will
appear with additional options to set.
…
and a “Flow Control”
panel
will be appear.
The general concept of Flow control is that Sentinel periodically makes an evaluation of
the recent water demand to the downstream network and decides whether a High or
