Model QLS Quad Loop Splitter Splits One 4-20 mA Current Loop into 4 Independent Loops

Model QLS Quad Output Loop Splitter / Retransmittersources up to four (4) independently adjustable 4-20 mA outputs from a single input, which can be 4-20 mA, 1-5V, 0-5V or 0-10V, as selected by jumpers. 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.

Model QLS overcomes problems associated with the common industrial wiring practice where the same 4-20 mA signal from a transmitter is sent to multiple devices in series. In such a circuit, the devices in the loop cannot share a common ground, but must be electrically floating, which 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 loose their 4-20 mA signal. In a single loop, 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 load cannot be individually adjusted for calibration purposes.


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