Abstract: There is provided a sample preparation device and method for preparing a sample of liquid for detection of impurities. First (40) and second (38) electrodes are provided, located for immersion in a liquid under test. A semipermeable membrane (42) is positioned to protect the first electrode (40) from a body of liquid under test (32). The semipermeable membrane allows the liquid under test to pass therethrough to reach the first electrode, while preventing solids carried in the liquid from reaching the first electrode, the first electrode being positioned to affect the liquid under test in the vicinity of a sensor (36). Particular embodiments feature a hydrophilic membrane to protect the electrodes from suspended solids in the sample, a thin electrode assembly to achieve a faster response and the addition of a heater for temperature control to achieve consistent detection conditions and improved anti-fouling properties.

Abstract: An adjustable spectacle kit article is positioned in the interior of a self-contained breathing mask having a full face plate permitting viewing outside. The kit includes a bracket having an elongated slot for a lug attached to the mask interior. A portion of the lug includes a frame holder for spectacles having a frame for supporting at least one eyeglass lens and bridge. The frame connects with the lug for positionally adjusting within the mask. In one aspect, the lug is composed of polycarbonate polymeric material. A resilient elastomeric grommet inserted in the slot frictionally engages the lug. Another adjustable lug composed of a resilient neoprene polymeric material can replace the grommet. The lug is angular shaped, inserted into the slotted bracket, and frictionally provides for extensively adjusting the frame within the mask. The lug is sized for space utilization in a confined mask.

Abstract: Adjustable spectacles article and protection method include a novel adjustable spectacle kit positioned in the interior surface of a self contained breathing mask. In one aspect, the breathing mask covers a full face of a wearer and includes a face plate permitting a wearer to view a space outside the mask. The adjustable spectacle kit includes a bracket attached to the interior surface of the mask, a lug attached to the bracket, and spectacles connected with the lug. In one aspect, the bracket defines a slot for holding the lug. In one aspect, the slot is elongated in an anteroposterior direction. In one aspect, a resilient elastomeric grommet is inserted in the slot, and the grommet frictionally engages the lug.

Abstract: Novel apparatus and method accurately measure ground circuit impedance. A ground circuit and electrical current source adjusted to 25 amperes or less simulate a ground fault. Ground impedance is determined by dividing voltage drop by amperage to determine impedance directly. In one aspect, impedance is determined and displayed automatically. Power wires of the circuit being measured serve as a means for transmitting voltage and current data. The cable itself serves as a current-carrying and voltage-transmitting conduit to determine directly the circuit impedance. The novel ground circuit impedance device and method measure impedance in underground mine power systems connecting to an outside electrical power substation outside the mine and using portable transformers in the mine.

Abstract: The present invention relates to a device for measuring both the color and turbidity of a liquid sample. LEDs are used as light sources and reference detectors are included to control the output of the LEDs. The device is also capable of monitoring and correcting for fouling of optical surfaces. The device is intended to be installed in-line in a mains water supply line. The device can be used in domestic water meters or on sewage treatment sites to monitor the effluent discharged back to the river.

Abstract: There is provided a sample preparation device and method for preparing a sample of liquid for detection of impurities. First (40) and second (38) electrodes are provided, located for immersion in a liquid under test. A semipermeable membrane (42) is positioned to protect the first electrode (40) from a body of liquid under test (32). The semipermeable membrane allows the liquid under test to pass therethrough to reach the first electrode, while preventing solids carried in the liquid from reaching the first electrode, the first electrode being positioned to affect the liquid under test in the vicinity of a sensor (36). Particular embodiments feature a hydrophilic membrane to protect the electrodes from suspended solids in the sample, a thin electrode assembly to achieve a faster response and the addition of a heater for temperature control to achieve consistent detection conditions and improved anti-fouling properties.