Modules are available which accept DC Voltage, DC Current, RTD & Potentiometer signals from field devices. They are also necessary to protect the measuring equipment from noise and transients generated due to inductive load switching and other unpredictable electrical disturbances occurring in the field. These modules eliminate occurrences of faulty measurements in process control equipment caused by ground loops. The use of signal conditioners with isolation allows direct interface of far away field mounted devices with analogue I/O channels of DCS, PLC-based Control Systems, AC/DC Electric Drives, Indicators, Recorders, etc. power supply (TPS) can drive field transmitters in case of 4-20mA DC input.
The addition of a scaling pot will provide for proportional follower operation.Analog Signal Conditioning & Isolation modules find applications where it is of prime importance to ensure reliable performance as well as safety while interfacing input/ output analog signals of sensitive electronic Control & Measurement Systems with field devices such as sensors and actuators. Wholesale Trader of Signal Isolators & Converters - Masibus Signal Isolator. Basics about signal isolators, barriers an IEPE sensor requires 2.8 mA constant current, a resistor requires a measuring current, an electronic sensor may. By simply connecting the input terminals across the armature leads of a “master motor”, you can use the VSI2 for master/follower operation. The wide input range allows the VSI2 to follow signals as low as +0-5V logic levels and up to the 180VDC levels present at the armature leads of a 180VDC motor. The output of the VSI2 is a filtered, pulse width modulated signal that is directly proportional to the input speed signal. DC-Powered Isolators These models are used to drive resistive loads (sources current). Typical uses are as a current repeater or to drive resistive loads. 4-20mA Loop-Powered Isolators, 2-Wire Models get power from the 4-20mA output or input loop (sinks or sources current). The Dart VSI2 can be used with virtually any motor speed control that has a speed reference circuit of +5 to +15VDC and an input impedance greater than 47K ohms. 3 Wire DC Powered Isolators: 4 Wire AC / DC Powered Isolators. An electrical isolation rating of 2500Vrms is achieved by the use of an optically isolated IC package. The VSI2 is packaged in an aluminum chassis mount housing and contains an on-board power supply for its logic circuit. They are also capable of converting and amplifying the process signals for improved performance. Signal isolators ensure a stable and accurate signal output by offering superior resistance to electro-magnetic interference. A single model accepts a wide range of input voltages (0-5 through 0-25VDC or 0-25 through 0-250VDC) AND 4-20mA. The VSI2 incorporates Dart’s unique feedback circuit, which virtually eliminates output changes due to the thermal drift of logic components. A signal isolator or signal converter is a signal conditioning device used to interface process signals with other devices. The Dart VSI2 (speed signal isolator) permits the user to control the output of a variable speed motor drive from any external grounded or ungrounded DC input signal. Rish PI-102 dual output DC Isolator serves to electrically isolate programmable input dc signal to programmable dc output signal. Elit.ee: Signal Converter/isolator WAS4 CCC DC 4-20/4-20MA, 2-way isolator, 1-ch., input 4.20mA, output 4.20mA, 24VDC 20, 0.55C, 12.5mm, Weidmller. VSI2 – Signal Follower Option NEW – Jumper Selectable DC volts or 4-20mA Operation
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