The QLPI731 is a four channel loop powered isolator that combines signal isolation and conversion in one compact package. Using SMD (Surface Mount Device) technology the QLPI731 offers an economical solution combining a range of options with accuracy and flexibility. Due to its width of only 15 mm per channel and the 35 mm DIN-Rail mounting the QLPI731 is ideal for "nestmounting" in field enclosures or as a "space saver" in larger control cabinets. The base unit features selectable process inputs, range changing is achieved using internal solder pads. Standard output is 4-20mA with a wide supply range of 7.5 to 38 Vdc enabling 12V battery supply in automotive applications. Double surge protection is standard with all series 700 loop powered transmitters to prevent failure due to spikes induced by DC switched inductive loads. Final calibration is trimmed using internal zero and span trim adjustments. Front mounted LEDs verify the function of each channel.