Abstract: A piezo sensor having an inner conductor having an inner conductor segment, where the inner conductor segment forms a tubular sidewall having a break, and also having an interior surface and an exterior surface; a plurality of individually polarized piezoelectric members, each having an inner face and an outer face, and each inner face contacting the first conductor exterior surface, each piezoelectric member being adjacent to another on the exterior face of the inner conductor, forming sets of adjacent faces; an outer conductor having an outer conductor segment forming a tubular sidewall having a break, the outer conductor having an interior surface and an exterior surface, where the interior surface contacts the outer face of the piezoelectric members; and where the break of the outer conductor segment is alignable with adjacent faces of two of the plurality of piezoelectric members, and further being alignable with the break of the inner conductor segment.

Abstract: A calibration system for a level meter comprising a tank having a sidewall and a bottom defining a tank interior, and a stilling well coupled to said tank, said stilling well having a sidewall, proximal and distal ends and a stilling well interior, and the distal end in fluid communication with the tank interior near the tank bottom, said proximal end of said stilling well being sealingly coupled to said level meter, said stilling well having a calibration fluid path allowing fluids to flow out of said stilling well interior; said stilling well having a vent opening that is sealingly closable near said proximal end; and a source of pressurized gas connectable to said stilling well interior, said stilling well having a measurement configuration where said vent opening is opened allowing said proximal end to vent gases in said stilling well interior, and a calibration configuration, where said pressurized air source is connected to said stilling well and flowing into said stilling well interior, where said pres

Abstract: A piezo sensor having an inner conductor having an inner conductor segment, where the inner conductor segment forms a tubular sidewall having a break, and also having an interior surface and an exterior surface; a plurality of individually polarized piezoelectric members, each having an inner face and an outer face, and each inner face contacting the first conductor exterior surface, each piezoelectric member being adjacent to another on the exterior face of the inner conductor, forming sets of adjacent faces; an outer conductor having an outer conductor segment forming a tubular sidewall having a break, the outer conductor having an interior surface and an exterior surface, where the interior surface contacts the outer face of the piezoelectric members; and where the break of the outer conductor segment is alignable with adjacent faces of two of the plurality of piezoelectric members, and further being alignable with the break of the inner conductor segment.

Abstract: A method and apparatus for detecting at least two process variables in a loop powered circuit. The method includes the steps of (a) powering the loop, detecting a first process variable value during a first time interval, (b) detecting a second process variable value during a second time interval after the expiration of the first time interval, where the detected process variable values are represented by the magnitude of a current passing through the loop circuit.

Abstract: The invention is a level meter having a flexible probe. The flexible probe includes a flexible conductor and at least one flexible band shield member disposed in a substantially vertically parallel relationship with the conductor, where the conductor and the shield member are offset from each other.

Abstract: The inventions is an explosion proof housing cover seal. The cover seal includes a housing and a cover, where the housing has an interior and an opening into the interior defined by a housing sidewall. The housing sidewall have a threaded portion. The cover has a sidewall with a cover threaded portion that mates with the housing sidewall threaded portion. The cover sidewall includes a circumferential cover bevel portion, and the housing sidewall has a matching circumferential housing bevel portion, where the two bevel portions contact circumferentially when the cover is sealingly engaged with the housing opening. The explosion proof housing cover seal further has a seal channel to contain a seal member. Each of the bevel portions has a proximal end, and the bevel proximal ends are positioned adjacent to the seal channel when the cover is sealingly engaged with the housing opening.

Abstract: The invention is an improved housing for storage of an electronics interface package. The housing is attached to a sensor adaptor or connector, and rotatable about that sensor adaptor. The interface package is contained in the interior of the housing, and is orientatable in the interior to provide different angles of view.

Abstract: A method and apparatus for detecting at least two process variables in a loop powered circuit. The method includes the steps of (a) powering the loop, detecting a first process variable value during a first time interval, (b) detecting a second process variable value during a second time interval after the expiration of the first time interval, where the detected process variable values are represented by the magnitude of a current passing through the loop circuit.

Abstract: The invention is a level meter having a flexible probe. The flexible probe includes a flexible conductor and at least one flexible band shield member disposed in a substantially vertically parallel relationship with the conductor, where the conductor and the shield member are offset from each other.

Abstract: The invention is a level meter having a flexible probe. The flexible probe includes a flexible conductor and at least one flexible band shield member disposed in a substantially vertically parallel relationship with the conductor, where the conductor and the shield member are offset from each other.

Abstract: The invention is a method to detect a weak interface signal in a guided wave level measurement device. The device includes a waveguide, a signal generator and a signal receiver, the signal generator and signal receiver being operationally connected to the waveguide. The method includes the steps of transmitting an outgoing signal; monitoring the signal received at the signal receiver to detect a first signal level that exceeds or equals a first threshold level (TH1) and if such a signal level is detected, continue monitoring the received signal to detect a second signal level that exceeds or equals TH1. Finally, if a second signal level in excess of TH1 is detected, continue monitoring the received signal to detect a third signal level that exceeds or equals a second threshold level TH2.