Abstract: At least one support tine, disposed generally in parallel to the force sensing tines of a DETF, is added to increase the stiffness of the structure for resisting various strains during assembly. Once the bonding operation is complete, the support tine(s) are cut or broken away from the structure to leave the remaining structure relatively strain free for operation.

Abstract: A two-piece vibrating beam force sensor is created by utilizing one thickness of quartz for the outer mounting structure. This outer mounting structure in the case of a pressure sensor includes the mounting structure, the flexure beams and the lever arm and, in the case of an acceleration sensor, includes the mounting structure, the parallel flexure beams and the proof mass. An inner quartz structure made of a double-ended tuning fork vibrating beam assembly which provides an electrical output indicative of tension or compression applied to the beam assembly. The vibrating beam assembly is mounted on the outer quartz structure with epoxy resin or low melting temperature glass frit and suitable electrodes for stimulating the vibrating beams into vibration are provided. The resultant structure is an inexpensive, easily produced, yet highly accurate vibrating beam force sensor.

Abstract: An air purification system monitor having an encapsulating cartridge for housing a humidistat to monitor the limits of humidity within a highly pressurized system having adjustable switch points from 0 to 70% relative humidity in a pressure range of from 0 to 5,000 p.s.i.g. with said encapsulating cartridge having electrical contacts associated with the humidistat to transmit a signal to a remote location.