Cecomp Electronics, APD 44H3 D, DC to DC Signal Conditioner High Select Function from 3 Inputs, 9-30VDC/10-32VAC PowerFeatures:Versions to Follow the Highest or the Lowest Input1200 V Input/Output/Power IsolationInput LoopTracker® LEDZero and Span Output Calibration PotentiometersFunctional Test ButtonBuilt-In Loop Power Supply for OutputApplications:Track Highest or Lowest of Multiple Input SignalsMonitor Maximum Flow From Multiple PumpsSensor RedundancyThe APD 44H3 D accepts 3 voltage or current inputs, depending on the model. They provide an optically isolated DC voltage or current output that is linearly related to the highest or lowest of the inputs, depending on the model.They are used where the highest or lowest of multiple inputs are required to drive the output, or where sensor redundancy is needed. Full 3-way isolation (input, output, power) makes this module useful for ground loop elimination, common mode signal rejection or noise pickup reduction. The inputs are not isolated from each other.The APD 44H3 D Transmittor can be wired to allow a mA output to be either sinking (passive) or sourcing (active).LoopTrackerAPI exclusive features include a green LoopTracker LED that varies in intensity with changes in the process input signal. It provides a quick indication of your process input at all times and can greatly aid in saving time during initial startup and/or troubleshooting.Functional TestAn API exclusive feature includes the Functional Test Button to provide a fixed output (independent of the input) when enabled. The test output level is potentiometer adjustable from 0 to 100% of output span. The functional test button greatly aids in saving time during initial startup and/or troubleshooting.