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SUMMARY:
FRONT FACE
ALARMS
AND FIXINGS
Technical Notice
DESCRIPTION:
The DBX2000 is a device for the calculation of the air flow rate in a
Page
duct using a differential pressure measurement (Pitot tube,
2
diaphragm, Venturi meter) corresponding to the dynamic pressure.
It has a navigator and a back-lit LCD display for dialogue with the
2
user.
3
It is equipped as standard with:
-
1 differential pressure sensor: scale 0-100mmCE
-
2 alarm relays (mini flow rate and maxi flow rate)
3
-
temperature correction (manual input)
-
absolute pressure correction (manual input)
4
It may be equipped with:
-
1 analogue input 4-20mA for measurement of the
5
temperature
8
-
1 additional sensor for the measurement of the absolute
pressure
-
1 or 2 analogue outputs 4-20mA
9
-
2 additional alarm relays (temperature and absolute pressure)
9
10
OPERATING PRINCIPLE:
11
The DBX2000 determines the air speed by applying the equation:
12
12
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with:
- v : speed in m/s
12
- K : coefficient of the measurement
12
- DP : dynamic pressure measured in mmCE
- g : 9.81 m/s
-
: density of the air kg/m3
where:
with
- PAbs : absolute pressure in mbar
- T : temperature in degrees C
-
0 =1,293
According to the section, the DBX2000 deduces the values of the air
3
flow m
/s, m
AIR FLOW RATE
CALCULATOR
DP
2 .
g
=
v
K
.
2
3
3
3
/h, Nm
/s or Nm
/h.
FI 72.0190.1021E
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