The QLPI731 is a four channel loop powered isolator that combines signal isolation and conversion in one compact package • Double surge protection to prevent failure due to DC switched inductive load spikes • The base unit features selectable process inputs, range changing is achieved using internal solder pads • Standard output is 4-20 mA • Wide supply range of 7.5 to 38 VDC • Final calibration is trimmed using internal zero and span trim adjustments • Front mounted LEDs verify the function of each channel