GB1463753A - Device for use in a monitoring system for ascertaining the presence of a flame in a burner - Google Patents
Device for use in a monitoring system for ascertaining the presence of a flame in a burnerInfo
- Publication number
- GB1463753A GB1463753A GB2121474A GB2121474A GB1463753A GB 1463753 A GB1463753 A GB 1463753A GB 2121474 A GB2121474 A GB 2121474A GB 2121474 A GB2121474 A GB 2121474A GB 1463753 A GB1463753 A GB 1463753A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacitor
- flame
- voltage
- terminals
- signal
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/08—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
- F23N5/082—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/12—Burner simulation or checking
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/18—Applying test signals, e.g. periodic
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
Abstract
1463753 Flame detectors SIE SOC ITALIANA ELETTRONICA SpA 14 May 1974 [22 May 1973] 21214/74 Heading G1A A monitoring device for use with a flamedetector head comprises a chain of stages connected in cascade and includes: a first stage for coupling to the detector head; a first one of the remaining stages being arranged to pass A.C. components but not D.C. components of the signals applied to it; a second remaining stage including energy storage means; a third remaining stage including first chopper means; and a fourth remaining stage including a threshold circuit and arranged to develop an output signal within a predetermined time after cessation of a flame-responsive signal. An ionization tube (A), Fig. 1 (not shown), positioned to respond to UV radiation from a furnace flame and supplied with high voltage from terminals c, d, Fig. 3, delivers in response to radiation a pulsating signal to a transformer T2 via a terminal e. Alternating signals induced in the secondary of T 2 charge, via a bridge rectifier 18-21, a capacitor 22 which discharges into the base of a transistor Q4 constituting a pulse shaper. A capacitor 25, responding to the alternating component in the Q4 output, charges via a diode pump 27-28 a capacitor 32 to a voltage which decays through a limiting diode 33 and resistor 34 in such a way that the mean voltage is logarithmically related to the pulse frequency. Variable resistors 30, 31 selectable by a switch S1 actuated by a relay S in response to a manual switch closing contacts h, i, provide adjustable sensitivity. Transistors Q2/Q3 regeneratively connected to a transformer T1 constitute a D.C./A.C. inverter generating squarewaves at about 1KHz which supply rectifier circuits providing 700 volts at terminals c-d for the ionization tube and - 15v for some stages of the electronic apparatus. Further square waves of 1.5 V, applied at terminals A-B as a cyclic test signal, cause a transistor Q5 to chop the voltage across the capacitor 32; the resulting pulses, if above a predetermined threshold, repetitively fire a Schmitt trigger Q6/Q7. A capacitor 40, responsive to the A.C. component of the Schmitt output, operates a diode pump 41/42 supplying current to one of two resistors 43, 44 selectable by a manual switch F to provide an adjustable discharge time constant in the event of any failure resulting in the cessation of pulses. The voltage across the resistor 43 or 44, chopped by a transistor Q8 fed with a further cyclic test signal at terminals C-D, is amplified by transistors Q9/Q10 supplying an A.C. signal to a transformer T3, from which a current after rectification is supplied to a relay K. If the apparatus correctly responds to the presence of a flame at every stage the contacts K1, K2 are held; but if the flame is extinguished, or if any stage of the apparatus fails to respond to A.C. components at its input, the current in the relay K will cease and so release the contacts. Analogue indication of the voltage across the capacitor 32 is provided by meters M1, M2; and a luminescent diode L indicates energization of the sensitivity selector relay S.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT24389/73A IT987792B (en) | 1973-05-22 | 1973-05-22 | FAILURE-PROOF APPLIANCE FOR CHECKING THE PRESENCE OF A BURNER FLAME |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1463753A true GB1463753A (en) | 1977-02-09 |
Family
ID=11213347
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2121474A Expired GB1463753A (en) | 1973-05-22 | 1974-05-14 | Device for use in a monitoring system for ascertaining the presence of a flame in a burner |
Country Status (9)
Country | Link |
---|---|
BE (1) | BE815325A (en) |
CA (1) | CA1026841A (en) |
CH (1) | CH572597A5 (en) |
DE (1) | DE2424525C2 (en) |
ES (1) | ES426485A1 (en) |
FR (1) | FR2230940B1 (en) |
GB (1) | GB1463753A (en) |
IT (1) | IT987792B (en) |
NL (1) | NL185685C (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3340118C2 (en) * | 1983-11-05 | 1985-11-21 | Kurt-Henry Dipl.-Ing. 4030 Ratingen Mindermann | Intrinsically safe flame monitor |
DE19619357A1 (en) * | 1996-05-14 | 1997-11-20 | Degussa | Bullet-resistant glazing and its use |
CN112924801B (en) * | 2021-03-06 | 2022-08-09 | 中北大学 | Voltage segmented adjustable voltage-current characteristic testing device for electric exploding foil and charging and discharging method |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3202976A (en) * | 1959-12-03 | 1965-08-24 | Scully Signal Co | Supervisory system with failure discrimination |
US3541549A (en) * | 1968-08-19 | 1970-11-17 | Mc Graw Edison Co | Self-checking flame detection apparatus |
-
1973
- 1973-05-22 IT IT24389/73A patent/IT987792B/en active
-
1974
- 1974-05-08 CA CA199,298A patent/CA1026841A/en not_active Expired
- 1974-05-14 GB GB2121474A patent/GB1463753A/en not_active Expired
- 1974-05-16 FR FR7417768A patent/FR2230940B1/fr not_active Expired
- 1974-05-20 ES ES426485A patent/ES426485A1/en not_active Expired
- 1974-05-20 CH CH691274A patent/CH572597A5/xx not_active IP Right Cessation
- 1974-05-21 BE BE2053634A patent/BE815325A/en not_active IP Right Cessation
- 1974-05-21 DE DE2424525A patent/DE2424525C2/en not_active Expired
- 1974-05-21 NL NLAANVRAGE7406811,A patent/NL185685C/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
IT987792B (en) | 1975-03-20 |
ES426485A1 (en) | 1976-07-01 |
FR2230940B1 (en) | 1979-07-27 |
BE815325A (en) | 1974-09-16 |
FR2230940A1 (en) | 1974-12-20 |
NL7406811A (en) | 1974-11-26 |
DE2424525A1 (en) | 1974-12-12 |
DE2424525C2 (en) | 1985-03-07 |
CH572597A5 (en) | 1976-02-13 |
NL185685C (en) | 1990-06-18 |
CA1026841A (en) | 1978-02-21 |
NL185685B (en) | 1990-01-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
SE328225B (en) | ||
US3555532A (en) | Vapor or particle detection device | |
US3889118A (en) | Electronic presence sensing device | |
US3683372A (en) | Multimode self-checking flame detector | |
US3723737A (en) | Infrared detection and control device | |
GB1347306A (en) | Fire detector | |
US3156908A (en) | Flame responsive apparatus | |
US3348104A (en) | Bias-controlled a. c.-operable voltage threshold circuit, and systems employing same | |
US4422069A (en) | System for indicating an emergency exit | |
US4193069A (en) | Latching alarm smoke detector | |
GB1463753A (en) | Device for use in a monitoring system for ascertaining the presence of a flame in a burner | |
US3441356A (en) | Pulsed spark gas ignition and fuel control system | |
US3513311A (en) | Radiation sensitive apparatus for activating a fire or explosion protection system | |
US3286761A (en) | Self-monitoring condition detecting apparatus | |
US3721833A (en) | Electronic incidence and coincidence safety control circuit | |
US4506161A (en) | Smoke detector with a radiation source operated in a pulse-like or intermittent mode | |
US2994859A (en) | Flame detecting apparatus | |
USRE29143E (en) | Fail-safe apparatus for checking the presence of flame in a burner | |
EP0050953B1 (en) | Flame detection circuit | |
US3657737A (en) | Method of and device for smoke detection and circuits therefor | |
US3624503A (en) | Means and method for detecting stray electrical energy, above a predetermined level, on a conductor | |
GB1388057A (en) | Combustion control apparatus | |
GB1056534A (en) | Improvements in and relating to electrical timing arrangements | |
US3892999A (en) | Power source for electronic flame detection devices and the like | |
GB1154663A (en) | Improvements relating to Electrical Detection Apparatus and Method. |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PE20 | Patent expired after termination of 20 years |
Effective date: 19940513 |