GB1391858A - Detector apparatus - Google Patents
Detector apparatusInfo
- Publication number
- GB1391858A GB1391858A GB4248672A GB4248672A GB1391858A GB 1391858 A GB1391858 A GB 1391858A GB 4248672 A GB4248672 A GB 4248672A GB 4248672 A GB4248672 A GB 4248672A GB 1391858 A GB1391858 A GB 1391858A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacitor
- oscillator
- circuit
- sept
- trigger
- 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
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Biological Materials (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Fire-Detection Mechanisms (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
Abstract
1391858 Electrophysical measurement SANDOZ Ltd 13 Sept 1972 [16 Sept 1971] 42486/72 Heading GIN To detect e.g. air in a blood flow line to a patient, capacitor plates surrounding the pipe-line are connected in a feedback path of a threeterminal oscillator to control the output signal. This is rectified and applied to a trigger/relay circuit to operate an alarm when the dielectric constant of the fluid in the pipe changes. As shown Fig. 1 a transistor oscillator 12 has an LC circuit 16 and a feedback capacitor 14 between the collector and emitter. The "hot" plate 18 of the sensor capacitor is connected through capacitor 22 to the base/emitter circuit and the other sensor plate 20 (or 20 and 24) to the earth line. Rectifier 44 converts the oscillator output to D.C. for application to the trigger/relay circuit Fig. 2 (not shown). Figs 3 & 4 (not shown) illustrate how the capacitor plates may be arranged in a mounting block, or a clamp Fig. 5 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT2874871A IT938824B (en) | 1971-09-16 | 1971-09-16 | EXTERNAL REVEALS OF THE PRESENCE OF A FLUID IN PIPES OR PIENT VESSELS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1391858A true GB1391858A (en) | 1975-04-23 |
Family
ID=11224116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4248672A Expired GB1391858A (en) | 1971-09-16 | 1972-09-13 | Detector apparatus |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS4838796A (en) |
| CA (1) | CA970432A (en) |
| CH (1) | CH552212A (en) |
| DE (1) | DE2244985A1 (en) |
| FR (1) | FR2154075A5 (en) |
| GB (1) | GB1391858A (en) |
| IT (1) | IT938824B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2282111A1 (en) * | 1974-08-12 | 1976-03-12 | Ieram Sarl | Gas bubble detector for pipe system - compares voltage at spaced electrodes receiving oscillations with reference |
| JPS5363289U (en) * | 1976-10-29 | 1978-05-29 | ||
| WO1980002600A1 (en) * | 1979-05-22 | 1980-11-27 | S Dahlqvist | A device for detecting and measuring small capacitance variations |
-
1971
- 1971-09-16 IT IT2874871A patent/IT938824B/en active
-
1972
- 1972-09-08 CA CA151,253A patent/CA970432A/en not_active Expired
- 1972-09-08 CH CH1322072A patent/CH552212A/en not_active IP Right Cessation
- 1972-09-13 GB GB4248672A patent/GB1391858A/en not_active Expired
- 1972-09-14 DE DE19722244985 patent/DE2244985A1/en active Pending
- 1972-09-14 JP JP9185972A patent/JPS4838796A/ja active Pending
- 1972-09-15 FR FR7232882A patent/FR2154075A5/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2154075A5 (en) | 1973-05-04 |
| CH552212A (en) | 1974-07-31 |
| CA970432A (en) | 1975-07-01 |
| JPS4838796A (en) | 1973-06-07 |
| IT938824B (en) | 1973-02-10 |
| DE2244985A1 (en) | 1973-03-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |