3032D AUG
15
DMD-C
Box 116 428 22 KÅLLERED SWEDEN
Tel +46 (0)31 720 02 00 Fax +46 (0)31 720 02 50
INSTRUCTIONS
INSTRUCTIONS
!
IMPORTANT: Read these in-
structions before installation and
wiring of the product.
Pressure transmitter with display
and built-in PID controller
DMD-C is a micro processor based differential pressure transmitter
intended for clean, neutral gases.
The working range is settable 0...100, 0...300, 0...500 or 0...999Pa.
It has signals for pressure indication 0...10V DC and 4...20 mA
which are automatically scaled to be proportional to the set pres-
sure range.
DMD-C also contains a pressure controller with settable PID control
and a 0...10 V DC output signal.
Installation
Remove the front cover. Mount the DMD-C on a steady, non-vibra-
ting surface. The unit should preferably be mounted vertically with
the pressure connections pointing downwards. Use the two screw
pockets located in the lower part of the unit.
Wiring
Wire the unit according to the wiring diagram.
For DC-supply connect teminal 1 to + and teminal 2 to -.
The earthing terminal should be connected since several protection
functions are decoupled to this terminal.
The pressure signals are automatically scaled to the set working
range. Both signals may be used simultaneously.
Startup and settings
All settings are done using the three buttons on the PC-board.
Two of the buttons (
Up, Down
) are used to move up and down
through the setting alternatives.
The third button (
Enter
) is used to choose the displayed alternative.
If the buttons are left untouched for longer than 10 seconds the unit
automatically returns to running mode.
Settings
Press
Enter
and the display will show -01.
Press
Up
until the display shows the parameter you wish to change.
Press
Enter
and the display will show the set value for the parame-
ter. The display will alternate between showing the value and the
menu number.
To change the value, press
Up
or
Down
until the desired value is
displayed. Press
Enter
to acknowlege and save the choice. The unit
will automatically return to normal running mode and the present
pressure will be displayed.
Menus
Pressure range -01
0...100 / 300 / 500 / 999 Pa
Setpoint
-02
0...max of set pressure range
Damping
-03
0...20 seconds.
P-band
-04
0...300% of the set pressure range
I-time
-05
0...999 seconds
D-factor
-06 0...999
Zero-point adj. -08
Press
Enter
to make zero-point adjust-
ment
Always start by setting the working range and doing a zero-point
adjustment .
The zero-point adjustment should be done before connecting the
pressure hoses.
Press
Enter
and the display will show -01.
Press
Up
until the display shows -08.
Press
Enter
and the display will show 000.
Damping is used If the pressure signal is experienced as being
too unstable .The DMD-C then does a continuous mean-value
calculation over the set damping time and uses the calculated
value as output signal and display value.
I-time = 0 means that the integration function is shut off.
Technical data
Supply voltage
24 V AC/DC ±15%.
Power consumption
5 VA
Ambient temperature
0...50°C
Humidity
90% RH maximum
Protection class
IP54
Pressure ranges
0...100, 0...300, 0...500, 0...999 Pa
Maximum overpressure
20 kPa
Material: Pressure housing Poly carbonate
Membrane
Silicone rubber
Pressure signals
0...10 V DC and 4...20 mA for full
set range
Controller signal
0...10 V DC
Load impedance
>2 kOhms for 0...10 V DC outputs
<500 Ohms for 4...20 mA output
Display
3 digit LED. Shows pressure in Pa
Accuracy
Better than ±1% of full scale for
the set range
EMC emission and immunity standards
This product conforms with the requirements of European EMC
standards CENELEC EN 61000-6-1 and EN 61000-1-3 and car-
ries the CE mark.
1 24 V AC/DC
2 24 V AC/DC system neutral
3 Signal neutral
4 Pressure signal 0...10 V DC
5 Pressure signal 4...20 mA
6 Controller output 0...10 V DC
7 Not connected
8 Not connected
9 Protective earth
