QLS Quad Output 4-20 mA Current Loop Splitter / Retransmitter

Signal Input
Signal Type Input Resistance Transmitter Excitation	4-20 mA, 1-5V, 0-5V, 0-10V (jumper selectable) 50 Ω for 4-20 mA, 412 kΩ for 1-5V, 404 kΩ for 0-5V, 935Ω for 0-10V 24 Vdc nominal, 30 mA max
Signal Outputs
Number of Outputs Signal Type Zero & Span Adjustment Signal Isolation Voltage Compliance Load Regulation Accuracy Span Tempco AC Rejection Response Speed Loop Current Sense Loop Continuity Indication	4 4-20 mA ± 10% for each output with 25-turn potentiometers ± 10V active isolation between input & outputs 12V (600Ω per loop at 20 mA) ± 0.005% of span from 0Ω to 600Ω ± 0.02% max span error at 23°C ± 10 ppm/°C (0.16 µA/°C) typical, ± 25 ppm/°C (0.4 µA/°C) max 90 dB from DC to 60 Hz 2 ms risetime, 7 ms settling time to 0.1% of final value 10Ω ± 0.5% series resistor to generate 200 mV at 20 mA Yellow LED lamp per loop, brightness proportional to current.
Power Input
Standard Power (QLS-1) Low Power Option (QLS-2) Power Frequency Power Isolation Power Consumption Power On Indication	85-264 Vac or 90-300 Vdc (DC operation not UL approved) 10-48 Vdc or 12-32 Vac DC or 47-63 Hz 250V rms working, 2.3 kV rms per 1 min test 3.5 W max, all loops delivering 20 mA Green LED lamp
Mechanical
Mounting Dimensions Weight Connectors Wire Size	35 mm DIN Rail per EN50 022 22.5 x 103 x 128 mm (0.9" x 4.1" x 5.0") W x H x D 140 g (5 oz) Detachable plug-in screw-clamp connectors 28-12 AWG, 2.5 sq. mm max
Environmental
Operating Temperature Storage Temperature Relative Humidity Cooling Required	-40°C to 70°C -40°C to 85°C 95% at 40°C, non-condensing Mount units with ventilation holes at top and bottom. Leave 6 mm (1/4") between units, or force air with a fan.

Galvanic & Active Isolation: A single input current loop is split into four independent output loops I1, I2, I3 and I4 by four current generators . The input and output signals are galvanically isolated from power and earth ground EG by up to 264 Vac. Active circuitry isolates the input signal ground SG and the four output loop grounds LG1-LG4 from each other to a common mode voltage of ±10V, thereby avoiding ground loops. Common mode voltage, labeled V1-V4 in the diagram, reflects actual differences in ground potentials. These can be caused by current flows in the factory.

Floating loads: Any output load R that is floating (not connected to a local ground or earth ground) can be connected between current output (Pin 1) and current return (Pin 2). Current return is internally tied to signal ground SG, which can be floating or be connected to earth ground.

Grounded loads: Any output load R can be connected to a local loop ground LG instead of current return. The loop grounds LG can each be different, but can only differ from signal ground SG by a common mode voltage CMV, which is defined as VLG - VSG. Signal ground SG must be tied to earth ground EG or be within 1 Volt of EG.

Input-output isolation: If a load R is grounded to a local loop ground LG, the available common mode voltage CMV is limited on the positive side by the unit's internal power supply and on the negative side by the 600 mW power dissipation limit of an output transistor. The diagram to the right shows allowable CMV as a function of output load resistance R. For example, with a 250Ω load, CMV can range from -13V to +17V. With a 500Ω load, CMV can range from -18V to +12V. The unit will not work correctly if CMV limits are exceed or load resistance is greater than 600Ω.