Abstract: A high-reliability, high-temperature liquid level detection probe uses a metal ring to hold a level detection prism in the probe body. The metal ring forms an interference fit with both the prism and the probe body and the metal/prism and metal/metal seals remain effective even at elevated temperatures so that contamination of the probe electronics is prevented. The probe electronics and the circuit board on which the electronics are mounted are enclosed in a holder so that the potting compound which is used to seal the electrical wires entering the probe does not contact the electronics or the circuit board. Thus, the circuit board and electronics are free to move in response to expansion and contraction of the potting compound and damage to the electronics and circuit board is prevented.

Abstract: In an improved electrical socket assembly a socket ring and contact block assembly are affixed to a faceplate by two snap rings. An outer snap ring fits into a groove cut into the outer end of the contact block. This snap ring bears against a shoulder on the inner surface of the socket ring and prevents the contact block from being pushed through the socket ring. The contact block extends through socket ring and further through the face plate where it is secured by an inner snap ring that bears against the inner surface of the face plate. The socket ring and the contact block are thus affixed to the face plate without using any bolts which can corrode and make replacement of the socket ring difficult.