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Dataforth Corporation, Tucson, Arizona, offers two DIN rail mount series of multi-channel loop powered isolators: the DSCL22 and DSCL23. These isolators provide a simple low-cost solution to providing up to 4000Vrms isolation protection for analog signals in the range of 0(4) to 20mA. They are designed to prevent the transfer of interference voltages or currents and to break signal distorting ground loops. The DSCL22 can be ordered with up to three channels in one package, which provides low cost per channel isolation.

The DSCL22 and DSCL23 are similar in function; both provide loop-powered isolation for 0(4) to 20mA analog signals deriving power from the input signal, and both are available in multi-channel versions. No external power supply is required. The DSCL23 differs slightly from the DSCL22 since it can feed isolated DC power from its output side to a field transmitter connected to its input side.

Download the DSCL22 and DSCL23 User Manuals.

The DSCL22 provides 4000Vrms transformer isolation in the single channel version. Two and three channel models are available that provide 2300Vrms transformer isolation. All have an input range of 0(4) to 20mA and output ranges of 0(4) to 20mA or 0(2) to 10V. Accuracy over the entire operating range is better than ±0.1%. The load resistance range is 0 to 1000W, and bandwidth is 300Hz. Packaging is a narrow DIN rail case measuring only 0.69" (17.5mm) wide for high-density mounting. Mounting tabs can be extended from the case for panel mount applications. Operating temperature is -25°C to +55°C, and storage temperature is -40°C to +70°C.

Each DSCL23 provides 2300Vrms transformer isolation in either the one or two channel versions. The DSCL23 is unique in the industry since DC power on the output side is isolated and provided to a two-wire transmitter connected to the input side. The returned 4 to 20mA input signal from the transmitter is also isolated and passed back to the output side. Input and output ranges are fixed at 4 to 20mA. Accuracy over the entire operating range is better than ±0.2%. The DC power supply can vary between 12 and 30VDC, and a minimum of 21.3VDC is supplied to the input connected transmitter when the power supply is 24VDC. Packaging is a narrow DIN rail case measuring only 0.69" (17.5mm) wide for high density mounting. Mounting tabs can be extended from the case for panel mount applications. Operating temperature is -25°C to +55°C, and storage temperature is -40°C to +70°C.

Dataforth was established in 1984 and is the world leader in data acquisition, signal conditioning and data communication products for industrial applications. Worldwide, our electronic data acquisition, signal conditioning, and data communication products provide rugged signal and data integrity and wide spectrum accuracy.

For additional information, call 800-444-7644 toll-free, email sales@dataforth.com, or visit our website at www.dataforth.com.