CA983569A - Process control system for hazardous areas - Google Patents

Process control system for hazardous areas

Info

Publication number: CA983569A
Authority: CA; Canada
Prior art keywords: control system; process control; hazardous areas; hazardous; areas
Prior art date: 1972-04-06
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Expired

Application number

CA167,990A

Other languages

English (en)

Other versions

CA167990S (en

Inventor

Alvan H. Bullard (Jr.)

William Calder (Iii)

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Schneider Electric Systems USA Inc

Original Assignee

Foxboro Co

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1972-04-06

Filing date

1973-04-05

Publication date

1976-02-10

1973-04-05 Application filed by Foxboro Co filed Critical Foxboro Co

1976-02-10 Application granted granted Critical

1976-02-10 Publication of CA983569A publication Critical patent/CA983569A/en

Status Expired legal-status Critical Current

Links

Classifications

- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/008—Intrinsically safe circuits

CA167,990A 1972-04-06 1973-04-05 Process control system for hazardous areas Expired CA983569A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US24154572A	1972-04-06	1972-04-06

Publications (1)

Publication Number	Publication Date
CA983569A true CA983569A (en)	1976-02-10

Family

ID=22911132

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA167,990A Expired CA983569A (en)	1972-04-06	1973-04-05	Process control system for hazardous areas

Country Status (7)

Country	Link
JP (1)	JPS4914881A (de)
CA (1)	CA983569A (de)
DE (1)	DE2316039C2 (de)
FR (1)	FR2179151B1 (de)
GB (1)	GB1412036A (de)
IT (1)	IT982957B (de)
NL (1)	NL7304743A (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR2359532A1 (fr) *	1976-07-20	1978-02-17	Cit Alcatel	Dispositif de limitation des variations de potentiel des bornes d'une charge alimentee par une source de courant continu a masse flottante
SE414357B (sv) *	1978-08-17	1980-07-21	Asea Ab	Overspenningsskydd for skydd av halvledarkomponenter av lageffekttyp
US4807081A (en) *	1986-09-05	1989-02-21	Raychem Limited	Circuit protection arrangement
US4954923A (en) *	1988-08-19	1990-09-04	Cooper Industries, Inc.	Intrinsic safety module interface
DE3832068A1 (de) *	1988-09-21	1990-03-22	Stahl R Schaltgeraete Gmbh	Explosionsgeschuetzte elektrische sicherheitsbarriere
DE3906621C2 (de) *	1989-03-02	1995-05-04	Hemscheidt Maschf Hermann	Eigensichere Stromversorgungseinheit
GB2238191A (en) *	1989-10-19	1991-05-22	Drexelbrook Controls	Intrinsically safe system
US10418806B2 (en)	2015-03-10	2019-09-17	Hewlett-Packard Development Company, L.P.	Safety protection circuit
US10942499B2 (en) *	2017-08-16	2021-03-09	Honeywell International Inc.	Intrinsic safety (IS) barrier with associated energy limiting apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB1133750A (en) *	1966-12-02	1968-11-13	Foxboro Yoxall Ltd	Electrical barrier device
US3631264A (en) *	1970-02-11	1971-12-28	Sybron Corp	Intrinsically safe electrical barrier system and improvements therein

1973
- 1973-03-07 GB GB1101673A patent/GB1412036A/en not_active Expired
- 1973-03-30 DE DE19732316039 patent/DE2316039C2/de not_active Expired
- 1973-04-04 IT IT4923073A patent/IT982957B/it active
- 1973-04-05 JP JP3911873A patent/JPS4914881A/ja active Pending
- 1973-04-05 CA CA167,990A patent/CA983569A/en not_active Expired
- 1973-04-05 NL NL7304743A patent/NL7304743A/xx unknown
- 1973-04-05 FR FR7312266A patent/FR2179151B1/fr not_active Expired

Also Published As

Publication number	Publication date
DE2316039A1 (de)	1973-10-18
IT982957B (it)	1974-10-21
GB1412036A (en)	1975-10-29
JPS4914881A (de)	1974-02-08
AU5251773A (en)	1974-08-22
FR2179151A1 (de)	1973-11-16
FR2179151B1 (de)	1977-08-05
DE2316039C2 (de)	1984-01-26
NL7304743A (de)	1973-10-09

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