The Position Analog Transmitter (PAT) is a stand-alone water level shaft encoders. The PAT is ideal for industrial and hydropower application with a 4-20 mA output. A precision potentiometer is the measuring element, and a number of ranges are available, depending on gear selection.

The PAT can also provide 0.2 to 1 or 1 to 5 VDC output, depending on the external barrier strip connections. When operated with Stevens instruments, the PAT obtains its power from the receiving device. If operated as a stand-alone transmitter, the user must provide power, typically from 13 to 40 VDC.

The PAT is housed in an aluminum enclosure. The cover may be removed for access to zero and span adjustments as well as the gears for major range changes. The basic PAT consists of a float pulley shaft coupled through a pair of gears to a precision potentiometer. English or metric ranges are selected by mounting either an 18 inch or 375 mm circumference float pulley.

The output of the potentiometer drives a circuit which converts the input shaft position to a 4 to 20 mA signal. Zero and span potentiometers provide a means to set the PAT range within limits for each model. Two precision resistors permit selecting one of two voltage output ranges with jumpers on the external barrier strip.