Modular switch device

Details Modular switch device Modular switch device

1987-09-17

1989-10-03

Noland, Tom

Measuring and testing

Instrument casing

738661, 73714, 200 56R, 307112, 361394, 361395, 36457104, 374141, 374143, G01D 2102, G01D 2100, G01K 102, G01L 1912

Patent

active

048708631

ABSTRACT:
A modular switch device includes a housing enclosing an interconnected control module, a display module and a power module. A sensor module supplying analog data signals from one of a temperature or pressure sensing element connects to the control module through a passage in the housing. A user connects his electrical wires and electrical power to the electrical assembly within the housing through an opening. The user can select between AC and DC switched output modules and the presence or absence of a 4-20 milliampere output module by plugging and unplugging same from wells provided in the housing. The manufacturer and user thus can modify the standard housing, which includes an internal electrical assembly to be a pressure or temperature switch and to provide selected output switch characteristics by applying and removing selected sensor and output modules thereto. The interconnection between the sensor module and the control module includes particular leads carrying analog data signals and serial digital information signals. The control module includes one analog to digital converter and control means in the form of a microprocessor.

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