System for remotely adjusting a parameter of an electrical circuit within an enclosure

Patent 4704607 Issued on November 3, 1987. Estimated Expiration Date:

October 22, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3559177

Distributed control system
Patent #: 4173754
Issued on: 11/06/1979
Inventor: Feiker

Remote control system for mining machines
Patent #: 4192551
Issued on: 03/11/1980
Inventor: Weimer , et al.

Television remote control system for selectively controlling external apparatus through the AC power line
Patent #: 4386436
Issued on: 05/31/1983
Inventor: Kocher , et al.

Appliance control system
Patent #: 4418333
Issued on: 11/29/1983
Inventor: Schwarzbach , et al.

Remote calibration system
Patent #: 4476706
Issued on: 10/16/1984
Inventor: Hadden , et al.

Toxic gas detection system calibrator Patent #: 4494399
Issued on: 01/22/1985
Inventor: Youngman

Inventors

Assignee

Sieger Limited (GB2)

Application

No. 06/790033 filed on 10/22/1985

US Classes:

340/3.71, Having manual control input340/632, Gas340/825.69, Radio link340/825.72, Wireless link73/1.07Span or zero

Examiners

Primary: Caldwell, Sr., John W.
Assistant: Smith, Leonard E.

Attorney, Agent or Firm

Wolf, Greenfield & Sacks

International Classes

G08C 23/00 (20060101)
G08C 23/04 (20060101)
H04Q 9/00 (20060101)
G01N 33/00 (20060101)

Foreign Application Priority Data

1984-10-25 GB

Abstract

Gas sensors 1 are mounted on respective explosion proof housings 2 that contain microprocessor circuitry 11 for operating signals from the sensors. Signals from the circuitry 11 are transmitted along a digital highway 4 to a central control unit. The sensors may be located at remote locations in an industrial process plant or for example along the roof of a tunnel. A non-contact hand held unit 12 is provided for individually setting operating parameters of the circuitry 11, to enable factors such as zero set, span and linearity to be set for the sensors individually. A two way wireless communication link is provided between the unit 12 and a transducer 15 on the housing 1, so that the current value of the circuit operating parameters can be displayed on a display 18 on the hand held unit.