NL7411493A - Fire detector for use in mines - with reference and smoke chambers each containing grid structure - Google Patents

Fire detector for use in mines - with reference and smoke chambers each containing grid structure

Info

Publication number
NL7411493A
NL7411493A NL7411493A NL7411493A NL7411493A NL 7411493 A NL7411493 A NL 7411493A NL 7411493 A NL7411493 A NL 7411493A NL 7411493 A NL7411493 A NL 7411493A NL 7411493 A NL7411493 A NL 7411493A
Authority
NL
Netherlands
Prior art keywords
grid structure
mines
chambers
fire detector
chamber
Prior art date
Application number
NL7411493A
Other languages
Dutch (nl)
Original Assignee
Anglo Amer Corp South Africa
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 Anglo Amer Corp South Africa filed Critical Anglo Amer Corp South Africa
Priority to NL7411493A priority Critical patent/NL7411493A/en
Publication of NL7411493A publication Critical patent/NL7411493A/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

The two chambers (10, 12) each contain an electrical grid structure, supported by an insulating element, attached to the respective chamber. To avoid leakage currents between the grill and the chamber due to humidity etc, the insulating element in the smoke chamber (10) is surrounded by a conductor. The chambers (10, 12) each being maintained at a first potential, and each of the grids having a second, opposite, potential. Pref. the grid in the smoke chamber (10) is supported by several insulating elements, the periphery of each being surrounded by a conductor. The grid is connected to an electronic impedance converted and each of the conductors is connected tot he output of the latter.
NL7411493A 1974-08-29 1974-08-29 Fire detector for use in mines - with reference and smoke chambers each containing grid structure NL7411493A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL7411493A NL7411493A (en) 1974-08-29 1974-08-29 Fire detector for use in mines - with reference and smoke chambers each containing grid structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7411493A NL7411493A (en) 1974-08-29 1974-08-29 Fire detector for use in mines - with reference and smoke chambers each containing grid structure

Publications (1)

Publication Number Publication Date
NL7411493A true NL7411493A (en) 1976-03-02

Family

ID=19821993

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7411493A NL7411493A (en) 1974-08-29 1974-08-29 Fire detector for use in mines - with reference and smoke chambers each containing grid structure

Country Status (1)

Country Link
NL (1) NL7411493A (en)

Similar Documents

Publication Publication Date Title
CA965148A (en) Condition measuring system using components of admittance of an electrical circuit
HK20079A (en) An electrical connector and its method of manufacture
CA1030234A (en) Electrical contacts and connectors
SE7509579L (en) ELECTRICAL CONNECTOR AND CONNECTOR INCLUDING SUCH
JPS52120768A (en) Semiconductor device
AU499582B2 (en) An electrical appliance
CA1025990A (en) Outdoor electrical enclosure
IT1032535B (en) Fire detector for use in mines - with reference and smoke chambers each containing grid structure
NL7411493A (en) Fire detector for use in mines - with reference and smoke chambers each containing grid structure
RO73363A (en) COATING ASSEMBLY OF AN ELECTRICAL CONNECTOR
IT1036998B (en) CIRCUIT ARRANGEMENT TO MEASURE THE EFFECTIVE VALUE OF AN ELECTRICAL SIGNAL
AU510805B2 (en) Housing foran electrical terminal
FR2276711A1 (en) ELECTRICAL CONNECTOR
IT7950136A0 (en) APPLIANCE FOR TIGHTENING ELECTRICAL TERMINALS
FR2280986A1 (en) ELECTRICAL CONNECTOR
FR2280246A2 (en) LARGE GAIN AND WIDE BANDWIDTH AMPLIFIER CIRCUIT AND SYSTEM CONTAINING SUCH A CIRCUIT
IT1034899B (en) ELECTRICAL TERMINALS AND CONNECTORS
SE7702535L (en) INSERT TYPE CONNECTOR FOR ENCLOSURE, ELECTRICAL COLLECTOR
FR2401464A1 (en) ELECTRICAL CIRCUIT AND PENDULUM GROUP CONTAINING SUCH A CIRCUIT
NL7800854A (en) ELECTRICAL FILTER CIRCUIT CONSISTING OF CHARGE-TRANSFER CONDUCTORS.
NO148964C (en) ELECTRICAL APPLIANCES FOR THE PREPARATION OF OXYGEN AND HYDROGEN
SU550688A1 (en) Electrical input high voltage
JPS5441443A (en) Integrated circuit device
SU543996A1 (en) Explosion-proof electrical enclosure
Gahimer Hydrolytic stability of electrical insulation materials