5
DYNAMIC PRESSURE
Consider the sections of pipe depicted in the sketch below. In sketch (
A
) the
pressure as read by the E30 when water
fl
ows will be less than the pressure read
by the pressure gauge. The difference between the two readings will be directly
related to the
fl
ow velocity and the ratio of the two pipe diameters. The E30 will
see the pressure as lower than that seen by the pressure gauge. This is due to
the higher velocity through the small pipe and thus lower pressure than the
pressure in the larger pipe where the velocity is lower. In sketch (
B
) both the
pressure gauge and the E30 will read the same pressure since the velocity is
constant between the two tapping points. In sketch (
C
) the E30 will read the
dynamic pressure as higher than the pressure as read by the pressure gauge.
This is the reverse of the situation in sketch (
A
)
Note that in a static situation with no
fl
ow the pressure gauge and the E30 will
read the same pressure in all three pipe con
fi
gurations.
Careful consideration should therefore be given to the location of the tapping
point. When water is
fl
owing the tapping points location will effect the pressure
reading and thus what the E30 actually displays.
A
B
C
Summary of Contents for E30
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Page 19: ...19 WIRING DIAGRAMS PLUG PLAY CONNECTIONS CONNECTIONS FOR A SINGLE PHASE PUMP...
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Page 21: ...21 TWO SINGLE PHASE PUMPS WITH A REMOTE INPUT LOW VOLTAGE DC SUPPLY REMOTE INPUT...