GB1257323A - - Google Patents
Info
- Publication number
- GB1257323A GB1257323A GB1257323DA GB1257323A GB 1257323 A GB1257323 A GB 1257323A GB 1257323D A GB1257323D A GB 1257323DA GB 1257323 A GB1257323 A GB 1257323A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- capacitor
- switched
- liquid
- transistors
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/50—Investigating or analyzing materials by the use of thermal means by investigating flash-point; by investigating explosibility
- G01N25/52—Investigating or analyzing materials by the use of thermal means by investigating flash-point; by investigating explosibility by determining flash-point of liquids
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/26—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback
- H03K3/28—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback
- H03K3/281—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator
- H03K3/284—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator monostable
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/353—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of field-effect transistors with internal or external positive feedback
- H03K3/355—Monostable circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/01—Shaping pulses
- H03K5/04—Shaping pulses by increasing duration; by decreasing duration
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
1,257,323. Transistor monostable circuit. ELLIOTT BROS (LONDON) Ltd. 6 March, 1970 [7 Dec., 1968], No. 58236/68. Heading H3T. [Also in Division G1] A control circuit for a flash point detector, in which a liquid is heated until its flash point is reached, cooled and then the cycle repeated, comprises a monostable circuit including transistors 24 and 25. During heating of the liquid transistors 24 and 25 are conducting and output buffer amplifier is switched on to actuate a heater. At the same time, transistor 33 is switched on and capacitor 37 is thus charged up through transistor 33. When the flash point of the liquid is reached ignition takes place and a pulse produced in an ionization detector is introduced to the control circuit at I/P to switch off transistors 24 and 25 and hence the heater, the liquid then cooling. Transistor 33 is also switched off and charging of capacitor 37 ceases. Capacitor 26 discharges until the potential at the control electrode of transistor 24 becomes positive with respect to the potential at the control electrode of transistor 38 which is set by capacitor 37, and then transistors 24 and 25 are switched on and the heater again actuated. As transistor 25 begins to conduct a positive transient voltage is applied to monostable circuit 34 causing it to be switched off for approximately one second during which time transistor 36 conducts to partially discharge the capacitor 37. Thus during a long heating period capacitor 37 becomes highly charged and the following cooling period is consequently short since the control electrode of transistor 24 quickly becomes more positive than that of transistor 38. During a short heating period the capacitor 37 becomes less highly charged and is consequently followed by a longer cooling period.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5823668 | 1968-12-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1257323A true GB1257323A (en) | 1971-12-15 |
Family
ID=10481105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1257323D Expired GB1257323A (en) | 1968-12-07 | 1968-12-07 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1257323A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3633363A1 (en) | 2018-09-20 | 2020-04-08 | Anton Paar ProveTec GmbH | Electric ignition for flash point tester |
-
1968
- 1968-12-07 GB GB1257323D patent/GB1257323A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3633363A1 (en) | 2018-09-20 | 2020-04-08 | Anton Paar ProveTec GmbH | Electric ignition for flash point tester |
| DE102018123097B4 (en) | 2018-09-20 | 2021-12-16 | Anton Paar Provetec Gmbh | Electric ignition for flash point tester |
| US11635207B2 (en) | 2018-09-20 | 2023-04-25 | Anton Paar Provetec Gmbh | Electric ignition for flashpoint tester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |