Abstract: A solid state analog device resistant to cyber security hacking is described herein. In one example, the device may include a signal input circuit, a comparator and driver circuit, and a display. The signal input circuit may be configured to detect loss of the input signal and the comparator and driver circuit may be configured to generate a voltage output and a reference power supply voltage from the input signal, wherein the comparator and driver circuit provides for a hardware-only design of the solid state analog device without digital assets, thus reducing cyber security hacking risks of the solid state analog device.

Abstract: A solid state analog device resistant to cyber security hacking is described herein. In one example, the device may include a signal input circuit, a comparator and driver circuit, and a display. The signal input circuit may be configured to detect loss of the input signal and the comparator and driver circuit may be configured to generate a voltage output and a reference power supply voltage from the input signal, wherein the comparator and driver circuit provides for a hardware-only design of the solid state analog device without digital assets, thus reducing cyber security hacking risks of the solid state analog device.

Abstract: The present circuitry provides for an expansion of loop powered technology preferably employed on 4-20 mA. The invention provides for extracting energy from current loops for use in displays, alarms, controls and communication. Further, the circuit allows for a reporting of instrument status and loss of signal to eliminate operator error in assuming the meter is faulty when in actuality a loss of signal has occurred.

Abstract: A self-powered current loop transmitter transmits a process variable over a wireless link, deriving operating power from the current which drives the loop. A storage capacitor is connected across the system input terminals through a switch to provide the operating power for the system components.

Abstract: A self-powered alternating current measuring and power generating circuit is designed to be connected across the terminals of the secondary winding of a current transformer. The circuit includes a current to voltage transformer, the primary winding of which is connected in series at a junction with a resistor across the terminals of the secondary winding of the current transformer. The junction of the resistor and the primary winding of the current to voltage transformer is supplied to a measuring circuit to produce an output coupled to a measuring instrument. Operating power for the measuring circuit is obtained from the secondary winding of the current to voltage transformer through a rectifier; so that the circuitry is energized without requiring additional internal or external power sources.

Abstract: An apparatus in the form of a current-loop controller driven by the EMF in the loop without the need for external power operates devices connected in the loop (in series) within the current operating range.

Abstract: A personal flotation device is configured and sized so that it is adapted to be positioned beneath a person's body to cause the person to be suspended in equilibrium in a partially-submerged state. The device includes a ring-shaped body and a plurality of side floats extending radially away from the ring-shaped body.

Abstract: A transformerless line powdered digital AC voltmeter for selected voltage ranges is disclosed which takes a minimum of electrical power from the AC line being measured. The AC input is firstly directed to an AC/DC converter to furnish a source of DC operative voltage, the AC/DC converter possessing external electronic circuitry to assure that an adequate minimum voltage appears as its input for any selected voltage range the invention measures. The AC voltage input to be measured is first halfwave rectified, and then voltage divided and smoothed before directed to the input of an A/D converter. The A/D converter has specific external circuitry added to it to assure that the output is accurate over the range of the voltages to be measured. The output of A/D converter is directed to a liquid crystal display which visually indicates the AC voltage measured. A external electronic circuit determines the decimal point for the voltage range measured.