Abstract: Measuring container fluid levels and fluid volumes using pressure sensors. An immersion tube is used to detect and convey the pressure at a bottom of a container, and a sender circuit converts the pressure into a liquid level or liquid volume. The sender circuit is isolated from the fluid container for fuel applications using corrosion resistant elastomers.

Abstract: A two-piece snap-on yarn trapper including a molded U-shaped bracket that snaps onto a yarn detector switch and supports a plural-turn helical spring. This spring is held inwardly bowed in the bracket so that the turns are held open or separated on the yarn side to provide a series of V-grooves for receiving the yarn that is drawn tightly thereinto by the trip lever of the yarn detector switch thereby to trap the yarn when it goes slack. The bracket is provided with a pair of inner edges or guides to guide the yarn to the middle portion of the helix where trapping is most effective and reliable. The helical spring is compressed and snap-in assembled on a pair of angularly-disposed stubs received in opposite ends thereof to hold the spring in its bowed condition on the bracket due to the tension of the helix.

Abstract: A trapper for trapping the yarn in a knitting machine and holding it, under normal slackening when knitting certain patterns, to prevent unwanted tripping of the detector switch and machine shutdown. This yarn trapper consists of a one-piece wire member having a two-turn helix with a pair of supporting arms bent out radially and outwardly from opposite ends thereof at a common angular point on the periphery of the helix and having inwardly bent mounting hooks at their ends. These arms are held slightly spread apart from their normal relaxed condition when the trapper is snap-mounted on the yarn detector switch to relieve the pressure between each of the half-turns and the full turn and thus provide a pair of semi-circular traps formed by the half turns in light touching contact with different portions of the full turn to frictionally hold even the thinnest yarn if it should be pulled thereinto upon attempted swinging of the trip lever.