Dwyer Mercoid CRF2-WR01T-096 Capacitive Level Transmitter Powder Series CRF2 Capacitive Level Transmitter Powder,Bulk or Liquids. 316 Stainless Rod and Connection Fully Configurable to Varying Lengths,other Connection Sizes and Flexible Probes Available. The Series CRF2 is a level transmitter providing a two-wire 4 to 20 mA output to indicate level of liquids,powders and bulk materials. State of the art sensing technology in the CRF2,using impulse RF admittance measurement provides excellent accuracy and stability. The CRF2 senses capacitance changes resulting from the height of the material in the tank between the probe and the tank wall. In non-metallic tanks or tanks that do not have the wall parallel to the probe a ground reference must be used.