The PROCAP I 3-A and II 3-A meet rigorous USDA, FDA and 3-A material and design standards for sanitary food and dairy processing. They can be used for high and low-level detection in bins, silos, tanks, hoppers, chutes, and other vessels used for the storage or manufacture of food or dairy products. They operate by detecting the presence or absence of material in contact with the probe, sensing minute changes (as low as 0.5 pF) in capacitance caused by the difference in the dielectric constant of the material versus the air. They feature a Class II hazardous location rating and are available with a wide assortment of probes and extensions to meet a variety of processing needs.