公开(公告)号：EP0775292B1

公开(公告)日：2001-12-19

申请号：EP95927552.0

申请日：1995-08-01

Applicant: ROSEMOUNT INC.

Inventor： JOHNSON, John, D. ,  KIRKPATRICK, William, R.

IPC: G01D11/24 ,  H05K5/02

CPC classification number: H05K5/0213 ,  G01D11/245 ,  H05K5/069

Abstract: A transmitter (100) transmitting a sensed process variable over a conductor (134A, 134B) includes a cylindrical housing (102) having a terminal compartment (110) and an electronics compartment (108) separated by a bulkhead (106). The terminal compartment (110) used for conductor connection is subject to moisture accumulation. An access channel (136) fully intersects an internal surface of terminal compartment (110) such that the access channel (136) drains moisture from the terminal compartment (110) across a range of mounting orientations. The transmitter (100) includes a circuit (104) in the electronics compartment (108) for compensating a process variable and providing the compensated process variable via a feedthrough circuit assembly (142) in the bulkhead (106), which in one embodiment, includes an encapsulated radio frequency interference filter (144), to terminals (132A, 132B) in the terminal compartment (110) for coupling to a conductor (134A, 134B) that is connected to an external controller.

公开(公告)号：EP0518916B1

公开(公告)日：1997-07-30

申请号：EP91905145.8

申请日：1991-02-21

Applicant: ROSEMOUNT INC.

Inventor： KIRKPATRICK, William, R.

IPC: G08C19/06

CPC classification number: G08C19/02 ,  H01F2019/085

Abstract: A process transmitter (50) transmits a 4-20 mA current representing a sensed parameter to a loop (52) which energizes the transmitter (50). An output circuit (60) receives energization from the loop (52) and controls the 4-20 mA output as a function of a sensor data input. The output circuit (60) further generates a transformer driver output which also serves as a clock for isolated circuitry (106). A sensor circuit (82) generates a transformer driver output representing the sensed parameter. An isolation transformer (76) driven by the driver output excites the sensor circuit (82) and provides a clock reference as a function of the driver output oscillation to the sensor circuit (82) . The isolation transformer (76) is a single coupling device which couples energization, clock reference, sensor data and programming data across an electrically insulating barrier between the output circuit (50) and the sensor circuit (82).

公开(公告)号：EP0783674A1

公开(公告)日：1997-07-16

申请号：EP95931781.0

申请日：1995-09-07

Applicant: ROSEMOUNT INC.

Inventor： SCHWARTZ, Bradley, N. ,  KIRKPATRICK, William, R.

IPC: G01K7 ,  G01K15

CPC classification number: G01K7/20 ,  G01K7/13 ,  G01K15/00

Abstract: A transmitter (10) in a process control loop (12) measures temperature. A calibrator (60) includes a known calibration element (64) which is connected to the transmitter (10). Software in the transmitter (10) compares a measured value of the calibration element (64) with the actual value of the calibration element (64) and responsively calibrates the transmitter (10). The calibrator (60) includes a temperature calibration sensor (70) for coupling to a terminal block (14) of the transmitter (10). The temperature calibration sensor (70) provides an actual temperature input to the transmitter (10). The transmitter (10) measures actual temperature of the terminal block (14) and compares actual temperature with a temperature measured by an internal terminal block temperature sensor (34), and responsively calibrates the internal temperature sensor (34).

Abstract translation: 过程控制回路（12）中的变送器（10）测量温度。 校准器（60）包括连接到发射器（10）的已知校准元件（64）。 变送器（10）中的软件将校准元件（64）的测量值与校准元件（64）的实际值进行比较并且响应地校准发送器（10）。 校准器（60）包括用于耦合到发射器（10）的接线盒（14）的温度校准传感器（70）。 温度校准传感器（70）向发送器（10）提供实际温度输入。 变送器（10）测量接线盒（14）的实际温度并将实际温度与由内部接线盒温度传感器（34）测量的温度进行比较，并且响应地校准内部温度传感器（34）。

公开(公告)号：EP0775292A1

公开(公告)日：1997-05-28

申请号：EP95927552.0

申请日：1995-08-01

Applicant: ROSEMOUNT INC.

Inventor： JOHNSON, John, D. ,  KIRKPATRICK, William, R.

IPC: G01D11 ,  H05K5

CPC classification number: H05K5/0213 ,  G01D11/245 ,  H05K5/069

Abstract: A transmitter (100) transmitting a sensed process variable over a conductor (134A, 134B) includes a cylindrical housing (102) having a terminal compartment (110) and an electronics compartment (108) separated by a bulkhead (106). The terminal compartment (110) used for conductor connection is subject to moisture accumulation. An access channel (136) fully intersects an internal surface of terminal compartment (110) such that the access channel (136) drains moisture from the terminal compartment (110) across a range of mounting orientations. The transmitter (100) includes a circuit (104) in the electronics compartment (108) for compensating a process variable and providing the compensated process variable via a feedthrough circuit assembly (142) in the bulkhead (106), which in one embodiment, includes an encapsulated radio frequency interference filter (144), to terminals (132A, 132B) in the terminal compartment (110) for coupling to a conductor (134A, 134B) that is connected to an external controller.