Omega Products DRA-MDM-11 User Manual
H-64
H
The DRA-MDM-11 is a mux/demux
system which transfers analog
information accurately via a single
pair of wires. The multiplexer unit
(DRA-M-11) accepts up to sixteen
4-20 mA process current inputs.
The multiplexed inputs are
transferred to the demultiplexer unit
(DRA-DM-11) at a scan rate of up to
1000 channels/sec up to a distance
of 2 kilometers (1.2 miles).
At the demultiplexer the current
outputs are reproduced in the same
order and magnitude as the inputs.
The demultiplexer is provided with
an alarm (flashing LED and dry
contact output) which is operated
whenever there is any interruption in
communication due to mux failure,
cable discontinuity or short-circuit.
Use of the DRA-MDM-11
mux/demux system enables a
considerable reduction in cabling
costs for a new installation or
considerable expansion of analog
data transfer capability in an
existing installation.
To Order
(Specify Model Number)
Model No. Price Description
DRA-MDM-11 $1425 Analog multiplexer/demultiplexer system
DRN-PS-1000 150 Power supply, 95-240 Vac input, 24 Vdc
@ 1A output
DRA-MDM-11 Analog
Multiplexer/Demultiplexer System
U Transfer up to Sixteen
4-20 mA Process
Current Loop Signals
Accurately Via a Single
Pair of Wires
U Saves Cable and
Installation Costs
U ± 0.1% Accuracy
U Failure Alarm
U Solid-State Technology
Comes with complete operator’s manual. Includes both DRA-M-11 multiplexer and
DRA-DM-11 demultiplexer.
Ordering Example: DRA-MDM-11 multiplexer/demultiplexer system with
two DRN-PS-1000 power supplies, $1425 + 2(150) = $1725.
$
1425
Specifications
DRA-MDM-11 MUX/DEMUX
SYSTEM
Accuracy: ±0.1% of span typical;
±0.25% of span max
Communications Cable: 2 wire
Operating Ambient: 0 to 70°C
(32 to 158°F) 5 to 95% RH,
noncondensing
Storage Temperature: -25 to 85°C
(-13 to 185°F)
MECHANICAL (TYPICAL FOR
DRA-M-11 MULTIPLEXER &
DRA-DM-11 DEMULTIPLEXER)
Enclosure: polycarbonate
Mounting: standard 35 mm DIN rail
or wall mount
Weight: 0.7 kg (1.5 lb)
Dimensions: 73 H x 200 W x 121
mm D (2.88" x 7.88" x 4.76")
DRA-M-11 MULTIPLEXER
Inputs: sixteen, 4-20 mA
process current
Addition to Loop Resistance: 360
Ohms
V - Transmitter Supply: Vsupply’–
1 Vdc
Output: multiplexed current loop
Scan Rate: 250, 500, 1000
channels/sec (selectable) for
distance of 2000, 1000 and 500
meters respectively
Supply Voltage: 24 Vdc ±10%
regulated
Indicators: 16 red LEDs for current
inputs, one yellow power on LED
Current Consumption: 20 mA max
DRA-DM-11 DEMULTIPLEXER
Input: multiplexed current loop
Analog Outputs: sixteen, 4-20 mA
continuous current loops
Alarm Output: dry contact (closed
on alarm), rated 1A @ 230 Vac
Scan Rate: 250, 500, 1000
channels/sec (selectable) for
distance of 2000, 1000 and 500
meters respectively
Indicators: 16 red LEDs for output
currents, one yellow power on LED,
one red alarm LED
Current Consumption: 500 mA
max (including output currents)
Supply Voltage: 24 Vdc ±10%
regulated
SM
OMEGA
CARE
Extended Warranty
Program
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