Abstract: A portable, self heating, container assembly for use in a motor vehicle includes an electrically heated double-walled insulated vessel having a lower end portion telescopically, rotatably and removably received in a tubular socket of a separate base unit. The socket bottom has a pair of electrical contacts connected through a power switch and fuse to a power cord adapted to be plugged into the vehicle cigarette lighter socket. The pair of contacts are engageable with cooperating electrical contacts on the vessel bottom for energization of the heating element upon the vessel being received in the recessed in the socket. The vessel bottom and socket have cooperating spaced, interengageable radial locking flanges arranged to securely lock the vessel and base unit together upon rotation of the vessel relative to the base unit after the lower end portion of the vessel is placed in to the socket.

Abstract: A method of digital process variable transmitter calibration includes the steps of sensing the process variable (PV) to produce an analog output which is converted to a digital signal representation. The digital signal is corrected by a microprocessor using a characterization equation previously individually developed during a manufacturing testing of the process variable transmitter over a predetermined range of environmental stimuli to ascrtain the coefficients for a polynomial in the form of PV=A.sub.o =A.sub.1 P+A.sub.2 +. . . A.sub.i P.sup.i. Thus, the digital computer produces a process variable representation as a modified digital output. Subsequently, the digital output from the computer is converted to a conventional 4-20 mA analog signal for use as a process control signal.

Abstract: An indicating and control apparatus uses Hall effect elements arranged on one side of a non-magnetic wall separating the elements from selectively positionable respective magnets. The magnets are selectively positioned adjacent to the non-magnetic wall to energize respective ones of the Hall effect elements by a code disc which is selectively positionable and displaceable with respect to the wall. The code disc is attached to a manually rotatable knob projecting from a housing enclosing the selectively positionable magnets and having a dial face on the exterior surface of the housing to cooperate with an indicator on the knob. The Hall effect elements, in turn, are located on a printed circuit board and are connected to associated circuitry to bias the Hall effect elements and to utilize output signals from the Hall effect elements.