Regin DMD Instructions page 2

DMD
IMPORTANT: Read these in-
structions before installation and
wiring of the product.
1 24 V AC/DC
2 24 V AC/DC system neutral
3 Signal neutral
4 Output 0...10 V DC
5 Output 4...20 mA
6 Not used
7 Net A DMD-LON only
8 Net B DMD-LON only
9 Protective earth
SNVT-list (DMD-LON only)
NvoPress
NvoPrecisePress
NvoFloatPress
NvoRange (type int)
Measuring range
0 =0...100 Pa, 1=0...300 Pa,
2=0...500 Pa, 3=0...1000 Pa)
NvoDamping (type int)
(Damping factor 0...20= 0...20)
NvoStatus
NviRequest
MaxSendTime
MinSendTime
SendOnDelta
Box 116 428 22 KÅLLERED SWEDEN
Tel +46 (0)31 720 02 00 Fax +46 (0)31 720 02 50
INSTRUCTIONS
Pressure transmitter with display
DMD is a micro-processor based differential pressure transmitter
with digital display.
It has settable working range 0...100, 0...300, 0...500 or 0...999Pa
and has output signals 0...10V DC and 4...20 mA.
The output signals are automatically scaled to be proportional to the
set pressure range. DMD is intended for clean, neutral gases.
DMD-LON has built-in capability for LON communication.
Installation
Remove the front cover. Mount DMD on a steady, non-vibrating
surface. The unit should preferably be mounted vertically with the
pressure connections pointing downwards. Use the two screw pock-
ets located in the lower part of the unit.
Wire according to the wiring schematics. Be careful with the supply
voltage polarity as system neutral and signal neutral are intercon-
nected. 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.
Startup and settings
Always start by setting the working range and doing a zero-point
calibration. All settings are done by using the three buttons below
the display. Two buttons (Up, Down) are used to move up and down
through the different setting alternatives that are available. The third
button (Enter) is used to to choose the displayed alternative.
Connect power to the unit and remove the pressure hoses if they
are connected.
Setting the pressure range
Press the button Enter and the display will show -01.
Press Enter again and the display will show 100, 300, 500 or 999
depending on the previously programmed pressure range.
To change pressure range, press Up or Down until the desired range
is displayed.
Press Enter and the new value will be stored in memory and the
DMD will return to normal running mode.
Zero-point calibration
Since the zero-point is dependant on the mounting position it is
important to do a zero-point calibration after installation.
Press Ener and the display will show -01.
Press Up until the display shows -08.
Press Enter and the display will show 000.
Press Enter again and the new zero-point will be stored in memory
and the DMD will return to normal running mode.
Connect the pressure hoses. The connectors are for Ø6mm hose.
Connect the higher pressure to the connector marked + (on the front
cover) and the lower pressure to the connector marked -.
INSTRUCTIONS
Damping
If the pressure signal is experienced as being too unstable it can
be electronically dampened.The DMD then does a continuous
mean-value calculation over the set damping time and uses the
calculated mean value as output signal and display value.
Press Enter and the display will show -01.
Press Up until the display shows -03.
Press Enter and the display will show the presently set damping
time.
Press Up or Down until the desired damping time is shown.
Press Enter and the new value will be stored in memory and the
DMD will return to normal running mode.
Service pin (DMD-LON only)
Pushbutton for the
service pin function
is situated on the
reverse side of
the PC-board
to the right of the
display.
Service pin
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
(Factory setting 300 Pa)
Damping 0...20 seconds, settable
(Factory setting 1 second)
Maximum overpressure 20 kPa
Material: Pressure housing Poly carbonate
Membrane Silicone rubber
Output signals 0...10 V DC and 4...20 mA for full
set range
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.