GB1497503A - Flame monitors - Google Patents
Flame monitorsInfo
- Publication number
- GB1497503A GB1497503A GB1631/76A GB163176A GB1497503A GB 1497503 A GB1497503 A GB 1497503A GB 1631/76 A GB1631/76 A GB 1631/76A GB 163176 A GB163176 A GB 163176A GB 1497503 A GB1497503 A GB 1497503A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- relay
- cycles
- diode
- flame
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
-
- 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
- F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
- F23N5/123—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods using electronic means
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2229/00—Flame sensors
- F23N2229/12—Flame sensors with flame rectification current detecting means
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Fire-Detection Mechanisms (AREA)
- Control Of Combustion (AREA)
Abstract
1497503 Burner control LGZ LANDIS & GYR ZUR AG 15 Jan 1976 [22 Jan 1975] 01631/76 Heading F4T During positive half-cycles of the A.C. supply at terminal R, the operating winding FR of an electromagnetic relay is by-passed by a first diode D1 in series with a Zener diode Z, whereby the sum of the forward volt drops of these diodes is applied across the winding, i.e. about 1À4 volts. For negative half-cycles at supply terminal R current flows through resistor R2 and through the winding FR or the transistor T1 When transistor T1 is conductive the relay is de-energized and when transistor T1 is blocked the relay is energized although it is supplied only during the negative half-cycles at terminal R. A capacitor C is charged via a second diode D2 during negative half-cycles at the supply terminal R and current flow from point b through resistor R5 enables transistor T1 via transistor T2 causing de-energization of the relay. However if a flame is present, ionization current flows through the resistor R8 due to the rectifying action of the flame. This current exceeds that through the diode D2 for a normal flame at the burner B so the transistors T1, T2 are blocked and the relay is energized.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH76575A CH580784A5 (en) | 1975-01-22 | 1975-01-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1497503A true GB1497503A (en) | 1978-01-12 |
Family
ID=4194649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1631/76A Expired GB1497503A (en) | 1975-01-22 | 1976-01-15 | Flame monitors |
Country Status (5)
| Country | Link |
|---|---|
| CH (1) | CH580784A5 (en) |
| DE (1) | DE2507811C3 (en) |
| FR (1) | FR2298765A1 (en) |
| GB (1) | GB1497503A (en) |
| NL (1) | NL7600629A (en) |
-
1975
- 1975-01-22 CH CH76575A patent/CH580784A5/xx not_active IP Right Cessation
- 1975-02-24 DE DE2507811A patent/DE2507811C3/en not_active Expired
- 1975-12-15 FR FR7538319A patent/FR2298765A1/en active Granted
-
1976
- 1976-01-15 GB GB1631/76A patent/GB1497503A/en not_active Expired
- 1976-01-21 NL NL7600629A patent/NL7600629A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH580784A5 (en) | 1976-10-15 |
| FR2298765B1 (en) | 1979-06-29 |
| DE2507811B2 (en) | 1978-10-26 |
| DE2507811C3 (en) | 1979-07-05 |
| FR2298765A1 (en) | 1976-08-20 |
| DE2507811A1 (en) | 1976-07-29 |
| NL7600629A (en) | 1976-07-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19950115 |