摘要:
A pressure sensing system includes a hot zone electronics module, a cool zone electronics module and a plurality of conductors that connect the hot zone electronics module to the cool zone electronics module. The hot zone electronics module includes a capacitive pressure sensor and an oscillator that provides an oscillating signal to the capacitive pressure sensor. The hot zone electronics module provides at least one DC sensor signal. The cool zone electronics module converts the at least one DC sensor signal into a pressure value and provides a DC power signal. The plurality of conductors convey the DC power signal to the hot zone electronics module and convey the at least one DC sensor signal to the cool zone electronics module.
摘要:
An infrared sensor includes a thermopile connected in series with an ambient temperature compensation resistance temperature detector (RTD) and four electrical leads. The thermopile produces a voltage as a function of temperature of a point of interest, while the RTD varies in resistance as a function of ambient temperature. Two of the leads deliver current to energize the RTD. The other two leads are used for sensing voltages produced by the thermopile and the RTD.
摘要:
A field device assembly includes a housing body, a first circuitry subassembly mounted to the housing body and positioned at least partially within the housing body, a first cover chassis having a shoulder, mating flame path restricting structures positioned on the first cover chassis and the housing body, a first threaded collar configured to fit about the first cover chassis and to permit rotation relative to the first cover chassis, and a second circuitry subassembly secured to the first cover chassis. The first threaded collar is threadably engaged with the housing body, and includes an engagement structure engaged with the shoulder of the first cover chassis to secure the first cover chassis to the housing body. The second circuitry subassembly includes an electrical connector configured for linear insertion engagement with a mating electrical connector within the housing body to electrically connect the first and second circuitry subassemblies.
摘要:
An isolator system for a pressure transmitter includes a port internal to the transmitter, a sensor tube, and a fill tube. The sensor tube is connected to the port to fluidly connect a passageway through a transmitter body to a pressure sensor. The sensor tube includes a first end disposed in the port. The first end has a first cross-sectional area. The fill tube is internal to the transmitter and connected to the port to fluidly connect to the passageway. The fill tube includes a second end disposed in the port. The second end of the fill tube has a second cross-sectional area that is less than the first cross-sectional area of the sensor tube.
摘要:
A display assembly includes a transparent cover piece, a display shroud having a contact structure arranged to face the transparent cover piece, an interface subassembly mounted on the display shroud, an electronics board shroud having a support member and a connection feature, and a biasing member operably engaged between the display shroud and the electronics board shroud. The connection feature mechanically connects the electronics board shroud to the display shroud while permitting axial displacement and rotation therebetween. The biasing member rests on the support member of the electronics board shroud, and the biasing member is configured to urge the contact structure of the display shroud into physical contact with the transparent cover piece. The interface subassembly includes a display circuit for providing a digital display and a touch circuit for providing touch actuation at or near the digital display through the transparent cover piece.
摘要:
A wireless field device (100) for use in monitoring acoustic noise includes an acoustic sensor (102) configured to sense acoustic noise. Processing circuitry (114) coupled to the acoustic sensor (102) is configured to identify a hazardous noise condition based upon the sensed acoustic noise and a personnel noise exposure standard. Output circuitry (106) provides a warning output in response to an identified noise condition. A system (700) is also provided which uses one or more acoustic sensors implemented in wireless field mounted monitors.
摘要:
A magnetic flowmeter for measuring flow rate of a process fluid includes: a magnetic coil arranged to apply a magnetic field to the process fluid. A pair of electrodes electrically couple to the process fluid and are arranged to sense a voltage induced in the process fluid related to the applied magnetic field and the flow rate of the process fluid. A flow tube of a non-conductive material is arranged to receive a flow of the process fluid therethrough. The flow tube carries the magnetic coil and the pair of electrodes. Flow meter circuitry applies a current to the magnetic coil and receives the voltage sensed by the pair of electrodes. A magnetic field spreader is positioned proximate the magnetic coil and is arranged to spread the magnetic field emanating from the magnetic coil and direct the magnetic field into the flow tube. An exterior wrapper extends around the assembly and completes a magnetic circuit.