Abstract: A thermistor probe is formed in a closed end tube and the probe is inserted through the header of a receiver/drier in a refrigeration system for sensing the temperature of the saturated refrigerant vapor in the receiver/drier. The sensed temperature is employed to energize and de-energize the refrigerant pump or compressor. The sensed temperature is also employed to energize and de-energize the refrigerant condenser fan motor.

Abstract: A method of attaching and sealing a straight walled tubular fitting to a block or valve body. The end of the tubing is closely fitted in a counterbore which has an undercut groove with a recessed elastomeric seal ring with the inner edges of the groove chamfered. A tubular insert having a thickened wall portion at one end is received in the tube so the thickened wall is coincident with the seal ring. A tapered punch is driven in the thickened end of the insert, causing the tubing wall to bulge locally and expand into the chamfered groove to secure the tube in the block and seal against the seal ring.