Loop Splitter splits one 4-20 mA loop into 4 independent loops.
February 8, 2011 -
Featuring ±10 V common mode isolation between inputs and outputs, Model QLS sources up to 4 independently adjustable 4-20 mA outputs from single output. If any device in output loop is removed from loop or fails, or if wiring fault occurs, other loops continue to operate properly. Input to splitter can be 4-20 mA, 1-5 V, 0-5 V or 0-10 V, as selected by jumpers. Excitation output is provided on signal input side to drive 2- or 3-wire transmitter at 24 Vdc and up to 30 mA.
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Original Press release
Laurel Electronics, Inc.
3183-G Airway Ave.
Costa Mesa, CA, 92626
USA
QLS Quad Loop Splitter Splits one 4-20 mA Loop into Four Independent Loops
Costa Mesa, CA - Laurel Electronics, Inc. announces its Model QLS, a quad output 4-20 mA loop splitter and retransmitter with ±10V common mode isolation between inputs and outputs.
Problems occur when the same 4-20 mA signal from a transmitter needs to be sent to multiple devices, such as meters, recorders and PLCs. If the devices are in series in the same loop, they cannot share a common ground, but must be electrically floating. This is often not possible. When any device in the loop is removed, fails or if a wiring fault occurs, all other devices in the loop also loose their 4-20 mA signal. The transmitter voltage compliance limit may be exceeded, since the voltage drops across loads in series are additive. Also, the 4-20 mA signal to each device cannot be individually adjusted for calibration purposes.
Model QLS solves these problems by sourcing up to four (4) independently adjustable 4-20 mA outputs from a single input. The outputs can share a common ground. The input and outputs are mutually isolated to ±10V by means of active circuitry to accommodate differences in local grounds with normal industrial grounding practices. If any device in an output loop is removed from a loop or fails, or if a wiring fault occurs, the other loops continue to operate properly. Each loop only drives a single load, avoiding compliance problems. The input to the quad loop splitter can be 4-20 mA, 1-5V, 0-5V or 0-10V, as selected by jumpers. An excitation output is provided on the signal input side to a drive a 2- or 3-wire transmitter at 24 Vdc and up to 30 mA.
Each output loop has two potentiometers for ±10% fine adjustment of zero and span, a yellow LED lamp to indicate loop continuity, and a test point across a 10-ohm series resistor, where 200 mV corresponds to 20 mA. This allows a multimeter to be used to measure the loop current without breaking the loop.
Model QLS is priced at $190 for 95-264 Vac power and $220 for 10-48 Vdc or 12-32 Vac power. For specifications and the product manual, visit www.laurels.com/qls.htm.
For more information, contact Jim Way, VP Sales & Marketing, phone 714-434-1631, email sales@laurels.com.
Founded in 1990, Laurel Electronics, Inc. is a leading U.S. manufacturer of programmable industrial meters, counters, timers, and transmitters.
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