Cecomp Electronics, APD 4059, Isolated DC Amplifier for 1 to 4 Sensor, 85-265 VAC, 60-300 VDC PowerFeatures:Drive up to Four 350 Ω BridgesAdjustable Excitation Power SupplySense Lead CompensationOne Minute Setup for Hundreds of I/O RangesRemovable Plugs for Faster InstallationNon-Interactive Zero and SpanFull 3-Way Input/Output/Power IsolationInput and Output LoopTracker® LEDsOutput Test or Calibration Resistor OptionsApplications:Load Cell Weighing Systems and ScalesStrain Gauge Pressure Sensors and TransducersTanks, Scales, Extruder Melt Pressure, Crane LoadsThe APD 4059 accepts an input from one to four strain gauges, bridge type sensors, load cells, or pressure transducers. It filters, amplifies, and converts the resulting millivolt signal into the selected DC voltage or current output that is linearly related to the input.The full 3-way (input, output, power) isolation makes this module useful for ground loop elimination, common mode signal rejection or noise pickup reduction.The adjustable excitation power supply generates a stable source of voltage to drive from one to four 350 Ω (or greater) devices. Sense lead circuitry is included to cancel the effects of leadwire resistance, if required.Input, output, excitation and zero offset are field configurable, via external rotary and slide switches. Offsets up to ±100% of span can be used to cancel sensor offsets or non-zero deadweights (taring). Non-interactive zero and span simplifies calibration.Sink/Source VersatilityFor maximum versatility the APD 4059 milliamp output can be selectively wired for sinking or sourcing. This allows connection to any type of mA input receiving device.LoopTrackerAPI exclusive features include two LoopTracker LEDs (green for input, red for output) that vary in intensity with changes in the process input and output signals. These provide a quick visual picture of your process loop at all times and can greatly aid in saving time during initial startup and/or troubleshooting.Output TestAn API exclusive feature includes the test button to provide a fixed output (independent of the input) when held depressed. The output test button greatly aids in saving time during initial startup and/or troubleshooting. The test output level is potentiometer adjustable from 0 to 100% of output span. A calibration resistor switch replaces the test button.