CA983569A - Process control system for hazardous areas - Google Patents

Process control system for hazardous areas

Info

Publication number
CA983569A
CA983569A CA167,990A CA167990A CA983569A CA 983569 A CA983569 A CA 983569A CA 167990 A CA167990 A CA 167990A CA 983569 A CA983569 A CA 983569A
Authority
CA
Canada
Prior art keywords
control system
process control
hazardous areas
hazardous
areas
Prior art date
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.)
Filing date
Publication date
Application filed by Foxboro Co filed Critical Foxboro Co
Application granted granted Critical
Publication of CA983569A publication Critical patent/CA983569A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/008Intrinsically 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 (fr)
CA (1) CA983569A (fr)
DE (1) DE2316039C2 (fr)
FR (1) FR2179151B1 (fr)
GB (1) GB1412036A (fr)
IT (1) IT982957B (fr)
NL (1) NL7304743A (fr)

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
WO2016141974A1 (fr) * 2015-03-10 2016-09-15 Hewlett-Packard Development Company, L.P. Circuit de protection de sécurité
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

Also Published As

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

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