Six Reasons Isolators and Splitters are a Good Choice

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Six Reasons Isolators and Splitters are a Good Choice

  1. 1. ISOLATORS & SPLITTERS
  2. 2. Types of Isolators <ul><li>Output Loop Powered – 651T-0600 </li></ul><ul><li>Input Loop Powered – 671T-0600 </li></ul><ul><li>Self-Powered – 631T-0500 </li></ul>Steals power from output loop w/ Sinking output Steals power from input loop w/ Sourcing output Separate Power Connection w/ Sourcing output
  3. 3. Types of Isolation <ul><li>Magnetic vs. Optical Isolation </li></ul>An LED and a phototransistor are separated so that light may travel across a barrier but electrical current may not. As an electrical signal is applied to the input, photons are emitted from the LED which excite the phototransistor. When it activates, a proportional electrical signal is generated at the output . The primary and secondary coils are wrapped around a core of very high magnetic permeability such as iron. A current passing through the primary coil creates a magnetic field. The magnetic field lines pass through the iron core which produce a current in the output of the secondary coil.
  4. 4. Reasons for Isolators / Splitters <ul><li>#1 – Prevent Ground Loops & Noise Problems </li></ul>A single ground poses no problem, but multiple grounds cause ground loops. In a ground loop, each ground is tied to a different earth potential. This allows current to flow between the grounds, interfering with the actual signal. If an extraneous current is produced from 50/60Hz AC power, noise is created. If this unwanted current is DC, it will create an offset. An Isolator prevents unwanted currents by breaking ground loops. This eliminates noise problems and DC offsets.
  5. 5. Reasons for Isolators / Splitters <ul><li>#2 – Isolate Bucking Power Sources </li></ul>PLC H2S Analyzer / Monitor 4-20mA Sourced Output Powered Input Passive Input Loop Powered Output
  6. 6. Reasons for Isolators / Splitters <ul><li>#3 – Amplification </li></ul>Dewpoint Transmitter AC Powered, 4-20mA Output up to 270 Ohms Output Up to 1000 Ohms Chart Recorder 250 Ohms Input Impedance Panel Meter 100 Ohms Input Impedance
  7. 7. Reasons for Isolators / Splitters <ul><li>#4 – Splitter for Isolating Loads </li></ul>1000 feet 500 feet 2-wire Pressure Transmitter PLC Display
  8. 8. Reasons for Isolators / Splitters <ul><li># 5 – Surge Protection </li></ul>Flowmeter Surge plus Isolation and Amplification Field Instrument Control Room
  9. 9. Reasons for Isolators / Splitters <ul><li>#6 – Easy to Scale / Adjust Range </li></ul>4-wire Optical Sensor Optical Interface Modify software to re-scale One step Load-Trim Adjustment +/-.75% Accuracy

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