GB834633A - Apparatus for visually indicating or recording numerical values of constituents of fluids under analysis - Google Patents
Apparatus for visually indicating or recording numerical values of constituents of fluids under analysisInfo
- Publication number
- GB834633A GB834633A GB16313/58A GB1631358A GB834633A GB 834633 A GB834633 A GB 834633A GB 16313/58 A GB16313/58 A GB 16313/58A GB 1631358 A GB1631358 A GB 1631358A GB 834633 A GB834633 A GB 834633A
- Authority
- GB
- United Kingdom
- Prior art keywords
- potentiometer
- voltage
- tap
- cell
- concentration
- 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
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Spectroscopy & Molecular Physics (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)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
834,633. Photo-electric fluid analysis. TECHNICON INTERNATIONAL Ltd. May 21, 1958 [June 7, 1957], No. 16313/58. Class 40 (3). In apparatus for obtaining a quantitative indication of the concentration of a substance in a liquid the voltage produced in a photo-cell by the light transmitted through the cell containing the liquid under test is compared with that produced by light transmitted through a standard cell in a self-balancing potentiometer circuit arranged to give a linear relationship between indication and substance concentration. Light from the source 12 transmitted through the flow or test cell 38, Fig. 1, is converted to a voltage across potentiometer 46 by the photo-cell 40. Similarly, photo-cell 30 produces a voltage across potentiometer 44 from the light through the standard cell 28. The voltage between potentiometer taps 68 and 72 is applied via the converter stage 54 and amplifier 58 to the winding 60 of the two-phase motor 62 which drives the tap 68 on potentiometer 44 to balance the system. The voltage across potentiometer 46 bears a logarithimic relationship to the substance concentration, by shunting the slide wire of potentiometer 44 by the resistors 78 a logarithmic law is obtained between the voltage at tap 68 and its position along the slide wire, hence the position of the tap repeated by the pointer 74, on scale 76 is linearly related to substance concentration. A second self-balancing potentiometer circuit is driven by the voltage between tap 88 of potentiometer 86 (mechanically positioned by shaft 70 to the position of the tap 68) and tap 96 on potentiometer 90 which is applied via the converter and amplifier 94 to the two-phase motor 100. This drives the counter 114 to a figure indicative of the concentration. This figure can be printed by the unit 122 to provide a record of concentrations in a series of liquids. Circuit 124 (Fig. 2, not shown), ensures that the figure is not printed until each reading of concentration has reached a maximum value.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US834633XA | 1957-06-07 | 1957-06-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB834633A true GB834633A (en) | 1960-05-11 |
Family
ID=22178512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB16313/58A Expired GB834633A (en) | 1957-06-07 | 1958-05-21 | Apparatus for visually indicating or recording numerical values of constituents of fluids under analysis |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE568223A (en) |
| DE (1) | DE1271428B (en) |
| FR (1) | FR1208241A (en) |
| GB (1) | GB834633A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3241432A (en) * | 1962-01-23 | 1966-03-22 | Technicon Instr | Method and apparatus for sequentially performing analyses on a plurality of fluid samples |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1080481A (en) * | 1952-11-13 | 1954-12-09 | Method and devices applicable in particular to spectrophotometers |
-
0
- BE BE568223D patent/BE568223A/xx unknown
-
1958
- 1958-05-21 GB GB16313/58A patent/GB834633A/en not_active Expired
- 1958-05-30 FR FR1208241D patent/FR1208241A/en not_active Expired
- 1958-06-06 DE DEP1271A patent/DE1271428B/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3241432A (en) * | 1962-01-23 | 1966-03-22 | Technicon Instr | Method and apparatus for sequentially performing analyses on a plurality of fluid samples |
Also Published As
| Publication number | Publication date |
|---|---|
| BE568223A (en) | |
| DE1271428B (en) | 1968-06-27 |
| FR1208241A (en) | 1960-02-22 |
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