Abstract:
An industrial process field device (200) is provided. The device (200) includes wireless process field device electronics (412; 512; 612; 712; 812) disposed within the industrial process field device (200) and at least one battery cell (326; 442; 552; 652; 742; 842) disposed within the industrial process field device (200) and operably coupled to the wireless process field device electronics (412; 512; 612; 712; 812). A circuit (400; 500; 600; 700; 800; 900) is provided that senses an electrical characteristic related to the at least one cell (326; 442; 552; 652; 742; 842) and provides an output to a switch (418; 518; 610; 718; 818) to decouple the at least one cell (326; 442; 552; 652; 742; 842) from the industrial process field device electronics (412; 512; 612; 712; 812) in response to certain conditions. Such conditions include too much current flowing from the at least one cell (326; 442; 552; 652; 742; 842); the voltage of the at least one cell (326; 442; 552; 652; 742; 842) being too low; or a short circuit being generated or otherwise observed.
Abstract:
A process device (12) is configured for coupling to a two wire process control loop (18) . Loop current output circuitry (60) is configured to apply an output current to the two wire process control loop (18) . Loop current verification circuitry (64) is coupled to the two wire process control loop (18) and configured to detect errors in the applied output current. At least a portion of the loop current verification circuitry (64) is independent from the loop current output circuitry (60) .
Abstract:
An apparatus (100) for measuring concentration of a material in a process fluid includes an antenna (115, 120) configured to contact the process fluid and a pulse generator (210) coupled to the antenna (115, 120) to generate a microwave transmit pulse through the antenna (115, 120). A pulse receiver (220) receives a reflected pulse from the antenna (115, 120) and the concentration of the material is calculated as a function of the reflected pulse.
Abstract:
An electronic circuit for converting higher-frequency output signals from a sensor into lower-frequency input signals for a discrete input wireless transmitter. The circuit includes a differential amplifier, a digital comparator, a digital frequency divider, and a transistor switch. The differential amplifier amplifies the sensor signals as a function of a frequency of the sensor signals. The digital comparator generates a square wave signal by comparing the amplified sensor signals to a fixed reference voltage. The digital frequency divider generates a lower-frequency signal by dividing the square wave signal. The transistor switch generates the lower-frequency input signals for the discrete input wireless transmitter by switching as a function of the lower-frequency signal from the digital frequency divider.
Abstract:
Vorrichtung zur Bestimmung der Konzentration eines Materials in einem Prozessfluid mit: einer Antenne, die so konfiguriert ist, daß sie das Prozessfluid kontaktiert; einem Impulsgenerator, der so gekoppelt ist, daß er die Antenne konfiguriert, um einen Mikrowellensendeimpuls über die Antenne zu erzeugen; einem Impulsempfänger, der mit der Antenne gekoppelt und so konfiguriert ist, daß er einen reflektierten Impuls von der Antenne empfängt; einem Konzentrationsrechner, der so konfiguriert ist, daß er die Konzentration des Materials als Funktion des reflektierten Impulses berechnet; und einer Verbindung, die konfiguriert ist um an eine Zweidraht-Prozesssteuerschleife gekoppelt zu werden und um Informationen bezüglich der Konzentration des Materials zu übertragen und um die Vorrichtung vollständig mit Energie zu versorgen.
Abstract:
A low power pulsed radar level transmitter has first and second pullable oscillator circuits that are offset from one another by a frequency offset. A third or reference crystal oscillator couples a reference frequency output to phase comparators in both the first and second crystal oscillator circuits. The phase comparators adjust biases on varactor diodes that pull the transmit and receive frequencies.
Abstract:
A location awareness system (100) including a communication network (102), and a network operating element (111) coupled to the communication network (102). At least one anchor network gateway (104) is coupled to the communication network (102), the at least one anchor network gateway (104) configured to generate a wireless anchor network (105). A plurality of anchors (106) are configured to couple to one of the at least one anchor network gateway (104) via its respective wireless anchor network (105). A plurality of tags (108, 110) is each configured to communicate with at least one anchor (106) to provide ranging information for determination of a position of the tag (108, 110) within an area covered by the system (100).
Abstract:
A location awareness system (100) including a communication network (102), and a network operating element (111) coupled to the communication network (102). At least one anchor network gateway (104) is coupled to the communication network (102), the at least one anchor network gateway (104) configured to generate a wireless anchor network (105). A plurality of anchors (106) are configured to couple to one of the at least one anchor network gateway (104) via its respective wireless anchor network (105). A plurality of tags (108, 110) is each configured to communicate with at least one anchor (106) to provide ranging information for determination of a position of the tag (108, 110) within an area covered by the system (100).
Abstract:
An industrial process field device (200) is provided. The device (200) includes wireless process field device electronics (412; 512; 612; 712; 812) disposed within the industrial process field device (200) and at least one battery cell (326; 442; 552; 652; 742; 842) disposed within the industrial process field device (200) and operably coupled to the wireless process field device electronics (412; 512; 612; 712; 812). A circuit (400; 500; 600; 700; 800; 900) is provided that senses an electrical characteristic related to the at least one cell (326; 442; 552; 652; 742; 842) and provides an output to a switch (418; 518; 610; 718; 818) to decouple the at least one cell (326; 442; 552; 652; 742; 842) from the industrial process field device electronics (412; 512; 612; 712; 812) in response to certain conditions. Such conditions include too much current flowing from the at least one cell (326; 442; 552; 652; 742; 842); the voltage of the at least one cell (326; 442; 552; 652; 742; 842) being too low; or a short circuit being generated or otherwise observed.