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    TEMPERATURE-SENSING AND TRANSMITTING ASSEMBLIES, PROGRAMMABLE TEMPERATURE SENSOR UNITS, AND METHODS OF MAKING AND USING THEM
    1.
    发明公开
    TEMPERATURE-SENSING AND TRANSMITTING ASSEMBLIES, PROGRAMMABLE TEMPERATURE SENSOR UNITS, AND METHODS OF MAKING AND USING THEM 审中-公开
    温度测量和交通安排，可编程温度传感器单元AND METHOD FOR生产和使用

    公开(公告)号：EP2035797A2

    公开(公告)日：2009-03-18

    申请号：EP07809305.1

    申请日：2007-06-02

    申请人： Precision Linear Systems, Inc.

    发明人： OWEN, William, H. ,  CLIFFORD, Laurence

    IPC分类号： G01K7/01

    CPC分类号： G01K1/14 ,  G01K7/01 ,  G01K7/16 ,  G01K2201/00

    摘要： In an exemplary embodiment, a temperature sensor and a 4-20mA transmitter on a single flexible circuit subassembly with a separate housing suitable for use in industrial control or HVAC applications. In a preferred embodiment, a narrow flex circuit substrate includes a silicon diode-based surface-mount sensor at a sensor end, a surface-mount programmable transmitter IC on a flex circuit substrate in the transmitter section, conductive traces connecting the sensor to the transmitter IC, and two conductive pads at an output end for connecting the 4-20mA output to a pair of external wires. Additional traces on the flex subassembly are provided for testing and programming the transmitter IC and sensor. The sensor end of the flex subassembly is mounted in a metal sensor tube, filled and sealed in the same manner as RTD or thermistor sensors with leads are currently assembled for use in industrial control or HVAC applications. The sensor tube assembly is attached to a connection head following industry standard practices. A separate plastic housing, compliant with existing industrial control or HVAC industry standards for transmitters, is mounted in the connection head and is configured to hold the transmitter end of the flex circuit. A two position terminal block is used to connect external wires to the 4-20mA output pads. A programmable transmitter is used to calibrate both the sensor and transmitter which are mounted together on the same subassembly. This provides total system accuracy better than +/- 0.3°C over a 200°C span, compared to +/-.8°C accuracy for existing IEC class A RTD- based systems. The programmable transmitter reduces the component cost by eliminating the need for any high precision components in the system. Manufacturing and testing costs are reduced by fabricating, assembling, and testing many flex circuits together on one panel at the same time.