Each DSCL23 loop powered isolator provides 1 or 2 channels of analog signal protection by electrically isolating its input from output for any DC process signal in the range 4-20mA. The DSCL23 feeds isolated DC power to the field transmitter and returns a fully isolated 4-20mA analog signal.

The input signal is chopped by a proprietary DC chopper circuit, isolation is provided by transformer coupling, a proprietary technique is used to suppress transmission of common mode spikes or surges, and the output signal from the secondary of the transformer is reconstructed to the original input signal.
  • Feeds DC Power to 4 to 20mA Transmitter, Isolates Loop
  • Simplified Wiring for Quick Install and Signal Protection
  • DIN Rail or Panel Mountable
  • Narrow DIN Package, Mounts up to 27 Devices into a 19" Rack Space
  • No Recalibration or Maintenance Required
  • 2300Vrms Transformer Isolation
  • Prevents Ground-Loop Problems
  • Prevents the Transfer of Interference Voltages and Currents
  • High Accuracy Over Full Span
  • CE Compliant
4-20mA Isolator with DC Supply - DIN or Panel Mount

DSCL23 Devices


Part Number Input RangeOutput RangeMechanical FormatInternal Power SupplyIsolation VoltageIsolation TypeAccuracySupply Voltage
4 to 20 mA 4 to 20 mA DIN rail,Panel Mount 21.3VDC at 20mA load 2300 Vrms Transformer 3-way ±0.1% Span Typical 12 to 30 Vdc (+24V Nom)
4 to 20 mA 4 to 20 mA DIN rail,Panel Mount 21.3VDC at 20mA load 2300 Vrms Transformer 3-way ±0.1% Span Typical 12 to 30 Vdc (+24V Nom)

Frequently Asked Questions


Can Dataforth provide calibration reports for modules I purchased?
Yes we can provide calibration reports for the modules that you purchased.

You can either
a) visit https://www.dataforth.com/TestDataReport.aspx to search for Test Report Datasheets by Serial Number or
b) you can send us a list of model numbers and their serial numbers to support@dataforth.com

Does Dataforth have a 4-channel 4-20mA isolator?
No. However, Dataforth does have two and three-channel 4-20mA isolators as shown in the following table.

Model Description
DSCL22-11 2-channel 4-20mA isolator
DSCL22-21 3-channel 4-20mA isolator
DSCL23-02 2-channel 4-20mA Isolator with DC Supply for 2-wire transmitter
DSCL24-11 2-channel 4-20mA isolator

Keywords/Phrases: 4-20mA isolator, 4-channel 4-20mA isolator, 4-channel 4-20mA DIN mount isolator

Why do I see a -10V shift when I change to a DSCL23 from a DSCA42-01C or similar?
The DSCA42-01C internal electronics is powered by an overall power supply and then the module output circuitry provides the output current whose return side (or negative side) is connected internally to the power supply common. This causes the output signal to be positive with respect to the common.

Whereas, the DSCL23 is loop-powered through its output terminals. That puts the 4-20mA receiver (the load) in series with the power supply. So when you measure the voltage from the power supply common (- terminal) to the other side of the load you will see a negative signal. The module could be made usable if the power supply has a fully floating output and you can make terminal 1 (the return current terminal) the common and measure the positive signal across the load from the power supply (-) to terminal 1 (the return current terminal), the common.

A better match for your application is the DSCA42-01C. Its internal electronics is powered by an overall power supply and then the module output circuitry provides the output current whose return side (or negative side) can be connected to the power supply common. This causes the output signal to be positive with respect to the common.

Keywords/Phrases: 4-20mA isolator with loop power, 2-wire transmitter interface signal conditioner with loop power

How does the load resistance of a module affect the noise at the output?
Noise at the output of a module is independent of load resistance.
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