New isolators offer wider range power at low cost

Edited by the Engineeringtalk editorial team Jul 25, 2000

Dataforth Corporation has announced the introduction of its new DSCL series of external powered and loop powered isolators.

Dataforth Corporation has announced the introduction of its new DSCL series of external powered and loop powered isolators.

These isolators provide a simple low-cost solution for providing protection for analogue voltage and current signals.

They are designed to protect valuable measurement and control signals as well as connected equipment from the dangerous and degrading effects of noise, transient power surges, internal ground loops, and other hazards present in industrial environments.

Five basic model types, the DSCL20, DSCL21, DSCL22, DSCL23, DSCL24, and DSCL25 make up the family of 20 isolators.

All provide input-to-output transformer isolation ranging from 500Vrms up to 4000Vrms.

Some are loop powered, deriving their power from the input signal, while others accept external universal power of either 24 to 60V AC/DC or 85 to 230V AC/DC.

Accuracy for the loop powered models is better than +/-0.2%.

Packaging options are many; including component style for printed circuit board mounting, small profile 12.5mm and 17.5mm wide DIN rail packages, and panel mount packages.

Depending on the model, they accept a wide range of voltage or current inputs and provide high-level analogue outputs in either fixed-gain or hardware programmable settings.

Operating temperature range is from -250C to +650C.

(Each DSCL20 and DSCL21 provides a single channel of 500Vrms-transformer isolation for analogue signals in the range of 0(4) to 20mA.

They operate passively, deriving their power from the input signal.

No external power supply is required).

The DSCL22 provides 4000Vrms-transformer isolation in the single channel version.

Two and three channel models are available which 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.

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.

The DSCL24 provides 2300Vrms I/O isolation and 3700Vrms power supply to I/O isolation for all models.

Two model versions are offered that accept universal power of either 24 to 60V AC/DC or 85 to 230V AC/DC, with the AC usage accepting 45 to 400Hz power.

The single channel model has four user configurable jumpers that provide 36 different I/O settings.

The DSCL25 provides 2300Vrms I/O isolation and 3700Vrms power supply to I/O isolation.

Two model versions are offered that accept universal power of either 24 to 60V AC/DC or 85 to 230V AC/DC, with the AC usage accepting 45 to 400Hz power.

Provision is made for monitoring the input circuit for a short or open and respond if a fault is detected.

Response for an input signal fault is lighting a front panel red LED, setting the output signal to a maximum or minimum value, and energizing the fault detect relay.