SEFRAM DBX2000 Manuel utilisateur

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

- OPERATING PRINCIPLE

- PRESENTATION OF THE

FRONT FACE

- OPERATION OF THE

MENUS

- MENU MEASUREMENTS

- MENU PARAMETERS

- OPERATION OF THE

ALARMS

- CHARACTERISTICS

- PRECAUTIONS

- CONNECTIONS

- SPACE REQUIREMENTS

AND FIXINGS

- NOTICE

- CALIBRATION

- MAINTENANCE

- WARRANTY

- CONFORMITY

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.

)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 »

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

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