A splitter divides an airproduct mixture flow, delivered thereto in an air-powered distribution line, between a primary and a secondary distribution channel, which may be flow-coupled to a product hopper or a hose flow-coupled to another product hopper or another splitter. The present invention involves analysis of a sequence of values corresponding to a waveform reflecting the hydraulic pressure required to turn a concrete mixing drum at successive instances during rotation. The backside passivation layer is formed of a low cost organic material. Preferred embodiments of Gap Diodes include Cool Chips, Power Chips, and photoelectric converters. Forms of wireless transmission other than optical transmission are also disclosed.