SEFRAM DBX2000 User manual

AIR FLOW RATE
CALCULATOR
Technical Notice
FI 72.0190.1021E
Page 1 of 12
SUPPLY VOLTAGE

AIR FLOW RATE
CALCULATOR
Technical Notice
FI 72.0190.1021E
Page 2 of 12
SUMMARY:
Page
- DESCRIPTION
2
- OPERATING PRINCIPLE
2
- PRESENTATION OF THE
FRONT FACE
3
- OPERATION OF THE
MENUS
3
- MENU MEASUREMENTS
4
- MENU PARAMETERS
5
- OPERATION OF THE
ALARMS
8
- CHARACTERISTICS
9
- PRECAUTIONS
9
- CONNECTIONS
10
- SPACE REQUIREMENTS
AND FIXINGS
11
- NOTICE
12
- CALIBRATION
12
- MAINTENANCE
12
- WARRANTY
12
- CONFORMITY
12
DESCRIPTION:
The DBX2000 is a device for the calculation of the air flow rate in a
duct using a differential pressure measurement (Pitot tube,
diaphragm, Venturi meter) corresponding to the dynamic pressure.
It has a navigator and a back-lit LCD display for dialogue with the
user.
It is equipped as standard with:
-1 differential pressure sensor: scale 0-100mmCE
-2 alarm relays (mini flow rate and maxi flow rate)
-temperature correction (manual input)
-absolute pressure correction (manual input)
It may be equipped with:
-1 analogue input 4-20mA for measurement of the
temperature
-1 additional sensor for the measurement of the absolute
pressure
-1 or 2 analogue outputs 4-20mA
-2 additional alarm relays (temperature and absolute pressure)
OPERATING PRINCIPLE:
The DBX2000 determines the air speed by applying the equation:
with:
-v: speed in m/s
-K : coefficient of the measurement
-DP : dynamic pressure measured in mmCE
-g: 9.81 m/s2
-  : 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
flow m3/s, m3/h, Nm3/s or Nm3/h.

gDP
Kv 2. .=
0
)273(273
25,1013


+
= T
PAbs

AIR FLOW RATE
CALCULATOR
Technical Notice
FI 72.0190.1021E
Page 3 of 12
PRESENTATION OF THE FRONT FACE:
OPERATION OF THE MENUS:
The different operating values of the DBX2000 are presented under the form of two menus and are accessible
thanks to the navigator.
-The « measurements » menu enables the measurements and the results of the calculations of the DBX2000
to be displayed.
-The « parameters » menu gives access to the device parameterisation.
The default display is the « measurements » menu. If there is no activity on the buttons for 30 seconds, the
« measurements » menu is automatically displayed.
The « right » and « left » buttons enable you to move from one menu to another:
For each step of the menus, the navigator buttons which are usable are shown as symbols on the display:
SUPPLY VOLTAGE

AIR FLOW RATE
CALCULATOR
Technical Notice
FI 72.0190.1021E
Page 4 of 12
MEASUREMENTS MENU:
(1) Display of the measured differential pressure (=dynamic pressure) :
- the measurement is averaged over the two last seconds
(2) temperature display (if analogue input present) :
- if the value received on the analogue input is lower than 3mA :
-The display indicates « --- »
-The temperature alarm is activated
-The temperature value for the calculations is replaced by that entered manually (see
parameters menu)
(3) display of the absolute pressure measured by the sensor
(4) calculated speed display
(5) (6) (7) and (8) display of the calculated air flow rate:
- the display format is automatically adjusted according to the value to be displayed:
X.XXX , XX.XX , XXX.X , XXXX , XXXXX or XXXXXX
- movement from one step to
the next is made with the
« valid » button
- from any step of this menu,
the « right » button gives
access to the « parameter »
menu

AIR FLOW RATE
CALCULATOR
Technical Notice
FI 72.0190.1021E
Page 5 of 12
PARAMETERS MENU:
- movement from one step to
the next is made with the
« valid » button
- access to the parameter
modification is made with
the « right » button
- after modifying a
parameter, you come back
into this menu
- from any step of this menu,
the « left » button gives
access to the
« measurements » menu

AIR FLOW RATE
CALCULATOR
Technical Notice
FI 72.0190.1021E
Page 6 of 12
(1) section display:
- if « right » button:
- choice of the section type « circular » or « rectangular »
- press « valid » button
- if « circular » type:
- input the diameter from 0.050 to 3.000 metres
- press « valid » button
- if « rectangular » type:
- input the dimension 1 from 0.050 to 3.000 metres
- press « valid » button
- input the dimension 2 from 0.050 to 3.000 metres
- press « valid » button
(2) measurement coefficient K display:
- if « right » button:
- input the measurement coefficient K from 0.01 to 9.99
- press « valid » button
(3) temperature display
this concerns the manual correction value which is used for the calculations if there is no analogue input or
if the analogue input is defective (<3mA)
- if « right » button:
- input of the temperature from –50 to 500 degrees C
- press « valid » button
(4) absolute pressure display (if no absolute pressure sensor present)
this concerns the manual correction value which is used for the calculations
- if « right » button:
- input of the absolute pressure from 500 to 3000 mbar
- press « valid » button
(5) measurement range of the analogue input display (if analogue input present)
XXX is the value for 4mA
YYY is the value for 20mA
- if « right » button:
- input of the value for 4mA from –50 to 500 degrees C
- press « valid » button
- input of the value for 20mA from –50 to 500 degrees C
- press « valid » button
(10) temperature alarm display (if analogue input present)
- if « right » button:
- input of the alarm value from –50 to 500 degrees C
- press « valid » button
- input of the alarm delay time from 0 to 99 seconds

AIR FLOW RATE
CALCULATOR
Technical Notice
FI 72.0190.1021E
Page 7 of 12
(6) and (7) display of the analogue output scales 4-20mA 1 and 2
XXXX is the corresponding value for 20mA output
YYYY is the unit of the output
Comment: 4mA output corresponds to the value 0
- if « right » button:
- input of the output type. Possible choice:
- air flow rate in m3/s
- air flow rate in m3/h
- air flow rate in Nm3/s
- air flow rate in Nm3/h
- speed in m/s
- differential pressure DP in mmCE
- absolute pressure in mbar (if sensor present)
- press « valid » button
- input of the scale value (value to 20mA)
- if it is a speed output: from 0 to 99.9 m/s
- if it is a DP differential pressure output: from 0 to 99.9 mmCE
- if it is an absolute pressure output : from 0 to 9990 mbar (from 10 into 10 mbar)
- if it is an air flow output :
- choice of the format with the « right » and « left » buttons (X.XX , XX.X , XXX ,
XXX0 , XXX00 , XXX000 )
- XXX being a value set from 000 to 999
- press « valid » button
(8) and (9) mini air flow and maxi air flow alarms display
XXXX is the value of the alarm
YYYY is the unit of the alarm
- if « right » button :
- input of the unit of the alarm. Possible choice (m3/s, m3/h, Nm3/s or Nm3/h)
- press « valid » button
- input of the value of the alarm
- choice of the format with the « right » and « left » buttons (X.XX , XX.X , XXX ,
XXX0 , XXX00 , XXX000 )
- XXX being a value set from 000 to 999
- press « valid » button
- input of the alarm time delay from 0 to 99 seconds
(11) and (12) display of the mini and maxi absolute pressure alarms (if absolute pressure sensor present)
- if « right » button :
- input of the value of the alarm from 500 to 3000 mbar
- press « valid » button
- input of the alarm time delay from 0 to 99 seconds (note: for the mini and maxi alarm, it is the
same time delay)
- press « valid » button
(13) language display
- if « right » button:
- choice of language « French » or « English »
- press « valid » button

AIR FLOW RATE
CALCULATOR
Technical Notice
FI 72.0190.1021E
Page 8 of 12
OPERATION OF THE ALARMS:
Mini air flow rate alarm:
If the calculated air flow is less that the set value for longer than the set time delay:
- the mini flow alarm appears
- the K1 led is lit up
- the K1 relay is at rest (contact between 11 and 12)
If the circulated air flow rate is greater than the value set for longer than the set time delay:
- the mini air flow alarm disappears.
- the K1 led is extinguished
- the K1 relay is supplied (contact between 11 and 14)
Maxi air flow rate alarm:
If the air flow rate is greater than the value set for longer than the set time delay:
- the maxi air flow alarm appears
- the K2 led is lit up
- the K2 relay is at rest (contact between 21 and 22)
If the calculated air flow rate is less than the value set for longer than the set time delay:
- the maxi air flow alarm disappears.
- the K2 led is extinguished
- the K2 relay is supplied (contact between 21 and 24)
Temperature alarm:
If the temperature is higher than the value set for longer than the time delay set
or if the analogue input is defective (<3mA):
- the temperature alarm appears
- the K3 led is lit up
- the K3 relay is at rest (contact between 31 and 32)
If the temperature is lower than the value set for longer than the time delay set:
- the temperature alarm disappears.
- the K3 led is extinguished
- the K3 relay is supplied (contact between 31 and 34)
Mini and Maxi absolute pressure alarm:
If the measured absolute pressure is less than the mini threshold or greater than the maxi threshold for
longer than the time delay set:
- the absolute pressure alarm appears
- the K4 led is lit up
- the K4 relay is at rest (contact between 41 and 42)
If the measured absolute pressure is between the mini threshold and the maxi threshold for longer than the
time delay set:
- the absolute pressure alarm disappears.
- the K4 led is extinguished
- the K4 led is supplied (contact between 41 and 44)

AIR FLOW RATE
CALCULATOR
Technical Notice
FI 72.0190.1021E
Page 9 of 12
CHARACTERISTICS:
- Mains voltage (see device front panel):
115 or 230 V + 10 % 50/60 Hz
14VDC
- Power consumption:
12 VA in AC
12 W in DC
- Differential pressure sensor:
range: 0-100mmCE
proof pressure: 0.75PSI (52mbar)
burst pressure: 10PSI (690mbar)
precision: <1.5%
measurable fluids: non corrosive dry gasses
- Relay contacts data:
dry contacts / 1A 250 V AC1
to be protected by the user
- Analogue input 4-20mA:
Non-integrated supply
- Analogue outputs 4-20mA:
integrated supply
maxi load: <500 Ohms
- Operating temperature:
-10° to 65° C compensated from 0 to 60°C
- Storage temperature:
-25°to 85° C
- Usage position:
vertical
- Protection of the device:
by fuses: T 160mA in 115V
T 80mA in 230V
T 500mA in 24VDC
- Housing: PC IP65
PRECAUTIONS :
-For the supply version in 115V or 230VAC, the DBX2000 leaves our workshops with the jumper
positioned for use in 230VAC (unless stated when ordering).
Check the position of the jumper according to the mains voltage:
-If a change of fuse is necessary, replace it with a fuse of the same calibre (see page 9 characteristics).
-Fix the DBX2000 in a vertical position
-Avoid dusty air entering the pressure inlets.
-Take the necessary precautions to satisfy the device characteristics (humidity, maxi pressure, etc.).
-Do not remove the front face of the DBX2000 to connect (only the cover of the connections)
-For the connection of the signals 4-20mA, it is recommended that you use a shielded cable and do not
follow the routing of the power cables.
-The work must always be carried out by duly qualified personnel.
WARNING: if you change the supply voltage, you must update the data plate
located on the outside of the box.

AIR FLOW RATE
CALCULATOR
Technical Notice
FI 72.0190.1021E
Page 10 of 12
CONNECTIONS:
In accordance with the device configuration, certain parts cannot be installed.
1) Electrics:
Bottom card: user connections. This card is accessible directly under the housing terminal cover.
At rest, de-energised: contacts between C and NC (11 and 12; 21 and 22; 31 and 32 ; 41 and 42)
When energised, the relays toggle: contacts between C and NO (11 and 14; 21 and 24; 31 and 34; 41 and 44)
2) Pneumatics:
By 6x8 rilsan tube
Only if version
power supply
24V DC

AIR FLOW RATE
CALCULATOR
Technical Notice
FI 72.0190.1021E
Page 11 of 12
SPACE REQUIREMENTS AND FIXINGS:

AIR FLOW RATE
CALCULATOR
Technical Notice
FI 72.0190.1021E
Page 12 of 12
NOTICE:
All of the parameters are recorded in the memory.
If an error is detected at power up, the display indicates « Config. Error. Code :X » where X represents an error
code (0 if error is on the zero setting, 1 if error is on the measurement scale; if a problem occurs, contact us).
In the event of a defect, the outputs 4-20mA are 0mA
CALIBRATION:
The device leaves our workshops, calibrated at 0, for zero pressure and at the maximum for the maxi pressure value
of the range. Settings done, device stabilised and at 20° C.
It is possible to adjust the zero pressure:
- put the device off-pressure (disconnect both pressure inlets)
- in the pressure display mode, press the « left » button and keep it pressed
- press the « valid » button
- release the buttons: zero is set
MAINTENANCE:
The device does not require any special maintenance. However, to ensure the measurements are precise, an annual
calibration is recommended especially with regard to « zero » (see CALIBRATION).
WARRANTY:
The DBX2000 has a 2-year warranty (equipment returned to our workshops). The warranty does not apply in the
following cases:
- breakage through dropping or knocks to the unpackaged products,
- damage caused by abnormal use (connecting error, surge, etc.)
- any work on the device apart from the connections
For ATEX devices :
No intervention can be done on the device: this one must be sent back to our workshop. Otherwise, it may lose its
homologation and warranty.
The unit must be returned to the following address:
CONFORMITY:
The DBX2000 device respect the European directives ( CEM and ATEX ), which concerns it.
However, it must be used correctly in applications for which it is intended, and should be linked or near CE
approved products.
WE RESERVE THE RIGHT TO MAKE ANY CHANGES TO OUR DEVICES THAT WE CONSIDER APPROPRIATE.
SEFRAM
PLACE GUTENBERG
59175 TEMPLEMARS
FRANCE