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DIN Rail Mount Configurable Signal Conditioners
DRF Series
U Voltage, Current, Frequency, Resistance,
Potentiometer, Thermocouple, RTD
and Load Cell Input Modules
U Field Configurable Signal Ranges
U Provides up to 3500 Veff Isolation Between
Input and Output and Power (Isolation
is Model Specific)
U Compatible with Standard 35 mm DIN Rail
The DRF series DIN rail signal conditioners are
designed to accept a broad range of input signals,
such as ac and dc voltage and current, frequency,
temperature (thermocouple and RTD), and process
transducers, and provide standard process outputs
of either 4 to 20 mA, or 0 to 10 Vdc. The DRF series
feature a modern housing design, that is easily
mounted on standard 35 mm DIN rails. Connections
are safely and securely made through pluggable screw
terminal connectors, with input and output connections
on the opposite sides of the module.
Functionality
The DRF series are designed to maximize
functionality. The front door of the housing provides
easy access to span and offset potentiometers
which may be used to field adjust the input and
output signal range.
Isolation
The input, output and power circuits are isolated by
3500 volts of galvanic isolation. The isolation protects
against potentially damaging voltages from passing
through the signal conditioners into connected
systems. The isolation also provides improved
measurement accuracy by minimizing the effects of
ground loops and electrical noise.
Outputs
Each DRF series signal conditioner is available with
current and voltage output (only one may be used at
a time). Available output types include 4 to 20 mA or
0 to 10 Vdc. Although pre-configured before shipping
from the factory, the output may be changed through
an internal jumper change.
Standard outputs are linear and proportional to the
signal input. Thermocouple input modules feature
special circuitry to linearize the output to the actual
temperature rather than the non-linear signal produced
by thermocouple sensors.
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To Order, Call or Shop Online at omega.com
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SPECIFICATIONS
(Common to all Models)
Power: 24 Vdc ±10%, 230 Vac ±10% 50/60 Hz,
115 Vac ±10% 50/60 Hz
Power Consumption: <3.8 VA
Output: 4 to 20 mA and 0 to 10 Vdc
Maximum Voltage Output: 11 Vdc approx.
Minimum Voltage Output: -1 Vdc approx.
Minimum Load Resistance (Voltage): ≥1 KΩ
Maximum Current Output: 22 mA approx.
Maximum Current Output: -1.5 mA approx.
Maximum Load Resistance (current): ≤400Ω
Accuracy: <0.2% or <0.3% depending on model
Linearity: <0.1% or <0.2% depending on model
Thermal Drift: <150 ppm/°C or 250 ppm/°C typical
depending on model
Response Time: 70 mS (Process and DC input
models); 250 mS (Temperature and AC input models)
Isolation*:
Input to Output: 3500 Veff
Power to Input: 3500 Veff
Power to Output: 3500 Veff (for AC powered
models), 1K Veff (for dc powered models)
Electrical Connections: Plug-in screw terminals
Protection: IP-30
MECHANICAL DIMENSIONS
Weight:
(DC Powered): 120 g (4.2 oz)
(AC Powered): 200 g (7 oz)
Dimensions:
(DC Powered Models): 110 H x 22.5 W x 93 mm D
(4.3 x 0.9 x 3.7")
(AC Powered Models):
110 H x 37 W x 93 mm D (4.3 x 1.46 x 3.7")
Operating Temperature: 0 to 60°C (32 to 140°F)
Storage Temperature: -20 to 70°C (-4 to 158°F)
*Tested True RMS, 60 sec. leak <1 mA
To Order, Call or Shop Online at omega.com
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Load Cell Input Signal Conditioner
DRF-LC
U For Load Cells with 1 mV/V, 2 mV/V and
3 mV/V Output
U Full Scale at 10 mV, 20 mV and 30 mV
U Pre-tare Jumpers at 50%, 25% and 0%
U Accuracy 0.2%
U Response Time < 75 ms
U Galvanic Isolation between Input, Output
and Power
The DRF-LC signal conditioner accepts a load cell
input and provides an isolated 0 to 10 Vdc or 4 to 20
mA output. Models are available with three different
power options, 24 Vdc, 120 Vac and 240 Vac.
The DRF-LC are ideally suited for industrial
applications. All models mount on a standard 35
mm DIN rail and provide galvanic isolation between
input, output and power up to 3500 Veff (model
specific). Module response time is 75 ms or less.
Specifications
Accuracy: <0.2% full scale
Linearity: <0.1% full scale
Thermal Drift: 250 ppm/°C typical
(max <200ppm/°C)
Response Time: <75 mS
(90% of signal)
Bandwith: 20 Hz (-3dB)
Pretare: 50%, 25% and
0% by jumpers
Impedance: 5 MΩ
Over Range Protection: 15V max
differential input
DRF-LC-230VAC-30MV-0/10,
shown larger than actual size.
FAR-1, 10 Vdc
power supply,
shown smaller than
actual size
The FAR-1 is a 10 Vdc power supply
for load cells. It can power for up to
4 standard load cells. It accepts 4 wire
load cells and 6 wire load cells. It may
be mounted on a standard DIN rail.
Load Cell Input
To Order Visit omega.com/drf_series for Pricing and Details
FAR-1 Power Supply with Load Cell
Input Range Table
Range Code Range
10MV 0 to 10 mV
20MV 0 to 20 mV
30MV 0 to 30 mV
To Order, Call or Shop Online at omega.com
Model No. Description
DRF-LC-(*)-(**)-(***) Signal conditioner for load cell input
FAR-1 10 Vdc power supply
* Specify power, “24Vdc” for 24 Vdc power, “115Vac” for 115 Vac power or
“230Vac” for 230 Vac power
** Specify range code from the Input Range Table
*** Specify output, “4/20” for 4 to 20 mA output or “0/10” for 0 to 10 Vdc output
Ordering Example: DRF-LC-230VAC-30MV-0/10, signal conditioner for load
cell input with a 0 to 30 mV input range, 0 to 10 Vdc output and 230 Vac power.
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