Omega Products DRC-4720 Installation Manual

DRC-4720

Bridge Input Signal Conditioner

INSTRUCTION

SHEET

M4739/0109

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Description:

The DRC-4720 is a DIN Rail mount, self-contained DC
powered module designed for load cell, strain gage, or
single ended use. The DRC-4720 contains a precision
instrumentation amplifier, filtered output and a built­in 10V excitation supply capable of driving a 350 ohm
bridge. The 0 to 30mV input range makes it compatible

with most strain gage based load cell or pressure
transducer outputs. The DRC-4720 provides an output of
4 to 20mA. Connections are made via easily accessible
screw clamp terminal blocks. Zero and Span adjustment
potentiometers are located externally as well for easy
access.

Amplifier

Gain
Input for a 20mA Output 10mV to 30mV

Linearity: 4 to 20mA Out ±0.01

Temperature Coefficient 0.05% / ºC

Input Offset Voltage
Temperature Coefficient

±70μV

0.7μV / ºC

Common Mode Voltage 0 to +5 Volts

Common Mode Rejection - DC 100 dB

Input Noise

0.1Hz to 10Hz

0.3μV pp Typ

Output

Output Range 4 to 20mA

Compliance Voltage 5.5V Max

Loop Resistance 250Ω Max

Frequency Response
2 Pole Filter

DC to 10Hz

Total RMS Gain
Temperature Coefficient

0.007% / ºC

Bridge Supply

Fixed Output +10V ±1.5%

Temperature Coefficient 0.05% / ºC

Load Current 30mA Max

Power Requirements

Voltage 18 to 26 Volts

Input Current (1 - 350 Ohm Bridge) 55 mA

Environment

Operating Temperature 0ºC to +55ºC

Storage Temperature -40ºC to +80ºC

Size

Size
(Not including Universal Foot for
standard DIN EN Rails)

1.65”H x 1.06”W x 3.78”L
(42 x 27 x 96mm)

Weight 3 oz. (85g)

Agency Approval

UL, CE UL508, UL1604, CE

Pending

Features:

Low Cost
Din Rail Mount
Load Cell or Single Ended Application
4-20mA

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DRC-4720 BRIDGE INPUT SIGNAL CONDITIONER

FULL BRIDGE CONNECTION

SINGLE ENDED

1. Hook Up Procedure
A. Connect the +out of the load cell to the +INPUT, pin 3.

B. Connect the -out of the load cell to the -INPUT, pin 4.
C. Connect the +excitation of the load cell to +EXCITATION,

pin 1.

D. Connect the -excitation of the load cell to -EXCITATION,

pin 2.

E. Connect the +24 VDC power supply to +24V, pin 8 and

COM, pin 7.

2. Turn on Procedure
A. Verify that the hook up procedure is complete.

B. Turn on the +24 VDC power source connected to the

DRC-4720.

3. Calibration Procedure
A. Jumper the +INPUT and the -INPUT terminals, pins 3
and 4, together.
B. Check the Gain Switch Table, and set SW1-1 and SW1-2
to the expected full scale output of the load cell.

Getting Started with the Model DRC-4720

SW1-1 SW1-2

FULL SCALE

LOAD CELL INPUT

OFF OFF 30 mV

ON OFF 20 mV

ON ON 10 mV

C. Connect a current meter across the output, pins 5 and 6.
D. Adjust the Zero Adjustment potentiometer for the
desired zero current.
E. Remove the jumper from the +INPUT and -INPUT
terminals.
F. With no load on the load cell, readjust the zero output.
G. Apply a known load to the load cell; in most cases it
would be 100% of full scale.
H. Adjust the SPAN ADJUSTMENT potentiometer for the
desired full scale output current.

I. Repeat steps F thru H until the desired settings are

obtained.