The Smith Meter® Model Universal Pulse Transmitter (UPT) is an infrared, quad-channel, high-resolution pulse generator driven by the output shaft of a positive displacement meter. It provides high-integrity pulse transmission and verification of signal and power for custody transfer measurement applications.

The UPT Transmitter incorporates a state-of-the-art infrared emitter coupled through a rotating disk to a receiver array. This guarantees pulse tracking capability as the infrared emitter ages. The array detects the passage of slots on the disk, supplying the information to an application-specific integrated circuit board that converts them, by means of the self-contained electronic circuitry, into positive square wave output signals. Circuit design is such that the high-resolution pulse signals generated are approximately 90 degrees electrically out of phase. The pulse trains are compatible with all Smith Meter electronics.

As a normal function of the array, a verification pulse output is generated to provide one pulse per revolution of the input shaft.