Abstract: The present invention provides a separation membrane having excellent separation performance and permeation performance, having high membrane strength, and mainly including a cellulose-based resin. The present invention relates to a separation membrane containing a cellulose ester and having a tensile elasticity of 1,500 to 6,500 MPa.

Abstract: Provided is a device for measuring a micro flow rate. The device includes a container having an internal space for containing a fluid flowing therein and an inflow line and an outflow line formed in communication with the internal space, a fluid level gauge configured to sense whether a level of a fluid collected in the container rises to a predetermined height to conduct or block flow of an electric current, a control valve disposed in the outflow line and configured to open or close the outflow line according to a state in which the control valve is electrically connected to or disconnected from the fluid level gauge such that the outflow line is opened or closed according to a change in the fluid level; and a control unit configured to calculate a micro flow rate of the fluid collected in the container using information acquired from at least one of the fluid level gauge and the control valve.

Abstract: The alarm mechanism of the invention signals the absence of a liquid from a source of aqueous liquid. The alarm mechanism comprises an alarm body having an inlet port and an outlet port; the inlet port in liquid communication with a source of liquid, the outlet port in liquid communication with a use locus. The alarm mechanism additionally comprises a float chamber placed in liquid parallel communication with the inlet port and the outlet port. The float chamber contains a float operably connected to a mechanical alarm. The float, as the chamber is emptied of liquid, reaches a position wherein a "low or empty product" signal is generated. The apparatus operates by passing liquid through the body. As liquid in the source of liquid is depleted and is no longer available for passage through the body, the body becomes emptied of liquid as the source of pressure removes liquid from the body and particularly from the chamber causing the float to reach a position generating a signal.

Abstract: The alarm mechanism of the invention signals the absence of a liquid from a source of aqueous liquid. The alarm mechanism comprises an alarm body having an inlet port and an outlet port; the inlet port in liquid communication with a source of liquid, the outlet port in liquid communication with a use locus. The alarm mechanism additionally comprises a float chamber placed in liquid parallel communication with the inlet port and the outlet port. The float chamber containing a float operably connected to an alarm. The float, when a chamber is filled with fluid, disables the switch from generating a signal. The float, as the chamber is emptied of liquid, reaches a position and is detected energizing the switch to send a "low or empty product" signal. The apparatus operates by passing liquid through the body.

Abstract: A float switch having a housing, a pivoting float body and a tube containing mercury. The wires extend from the tube, into pivot arms of the float body, out of apertures within the arms and upwardly out an orifice in the top surface of the housing. The pivot arms include a pivot arm stop to center the float body within the housing. The pivot arms are sealed to prevent ingress of water into the tube. The housing includes dual rows of apertures to lessen the effects of clogging.

Abstract: A device and method for sensing fluid characteristics, including level, temperature, pH and chemistry, comprises a switch affixed to or embedded in a container of a size, shape and density such that said container floats stably in said liquid until a predetermined level is reached; the container tilts so as to operate the switch when the liquid drops below or increases above a predetermined level. The device may contain additional sensors which measure and report other characteristics of the liquid, such as temperature, pH, viscosity, chemistry or biochemistry.

Abstract: A device for warning when a low fluid level is reached is provided in which a levelness detecting switch is encapsulated in a conically shaped inert material (such as TEFLON.TM.), sized appropriately to the predetermined fluid limit, and coupled to an alarm device (such as an audible alarm, a frequency signal or a light).

Abstract: A refrigerant loss detector and alarm, the detector device suitable for installation in the piping of a refrigeration system which utilizes a liquid/vapor phase change substance as the refrigerant. Upon detection of refrigerant vapor accumulating in the loss detector, thereby displacing refrigerant liquid therefrom, the orientation of a float element containing a mercury switch is affected. Upon a fall in refrigerant liquid level in the loss detector, the mercury switch becomes activated, thereby completing an external electrical circuit which contains a time delay device and an alarm device.

Abstract: A tilt switch comprises a housing forming a cylindrical inner chamber and having two electric terminals extending through an end wall of the chamber. A mercury mass of less volume than the chamber is disposed within the chamber and is arranged to electrically interconnect the terminals when the switch is in a first position relative to vertical, and to break the electrical contact when the switch is tilted to a second position relative to vertical. A spherical body of less density than the liquid and including a non-electrically conductive outer surface floats upon a surface of the liquid and is pushed upwardly against a surface of the chamber. The spherical body has a smaller diameter than the diameter of the chamber to define a restriction passage which inhibits the flow of liquid when the switch is subjected to shock.

Abstract: An improved housing for a mercury float switch as disclosed in U.S. Pat. No. 4,223,190. The improved housing includes an exterior bracket connected to a side wall of the housing structured to releasably yet securely retain lead electrical wires extending from the mounting shaft of the float switch whereby the exposed lead electrical wires may be arcuately configured, then wedgedly locked between the bracket and side wall. By this arrangement, free pivotal movement of the float switch within the housing is maintained while holding the exposed lead electrical wires above the bilge water level, as in a boat bilge.

Abstract: A polymeric insert is arranged for securement within a base portion of a water cooler housing to accommodate drainage from a water cooler top wall. Drainage and condensation is accommodated to minimize corrosion of a lower portion of the water cooler housing. A modification of the structure includes a fungicide and herbicide distribution reservoir and an alarm indicating stoppage of the associated drain structure of the organization.

Abstract: A liquid regulator device has a buoyant body which is anchored to a side of the vessel by an electrical conductor. The body contains a movable ballast in the form of a ball and an attitude sensitive switch connected to the electrical conductor. The buoyant body floats in the liquid with one end in the uppermost position. Changing the liquid level tensions the electrical conductor causing the body to tumble. When the body has tumbled through a predetermined angle, the ballast moves from one end of the body to the other to cause the body to rapidly assume the reverse orientation. This causes the attitude sensitive switch to change state, which is used to control the liquid level.

Abstract: An electric control element, and more particularly a control that is responsive to a liquid level indicator and is operative to prevent a fuel tank from inadvertently running dry.

Abstract: A position responsive switch apparatus comprising a housing and a mounting assembly secured within the housing. The mounting assembly includes a pair of oppositely disposed spaced-apart walls. Each of the walls has an aperture contained therein which are in general axial alignment. An elongate switch extends through the apertures and is transversely supported by the mounting assembly so that the switch may move in a generally longitudinally axial direction within the confines of the mounting assembly. The switch may be in one of two preselectd conditions. The switch moves from one condition to the other condition in response to an opposing directional displacement of the switch. A retaining element is carried on the switch intermediate of the apertures. The retaining element is of a greater dimension than the apertures so that the walls moveably retain the switch within the mounting assembly.

Abstract: Apparatus for increasing the effective differential of a position responsive switch (30) which comprises a mounting plate (43) having an aperture larger than the switch, and stop members (46, 47) carried by the switch for limiting the "tumbling" motion of the switch in the aperture. A second embodiment interposes an intermediate mounting member (56) between the switch (30) and the mounting plate (55), and enables tumbling motion between the switch and the intermediate member as well as between the intermediate member and the mounting plate. The apparatus is shown in a float (29) for use for "pump down" and "pump up" operation.