Method for the operation of automated analysis apparatus

• US 4,300,906 A
• Filed: 10/06/1980
• Issued: 11/17/1981
• Est. Priority Date: 10/06/1980
• Status: Expired due to Term

• Current Assignee: Technicon Instruments Corporation (Bayer AG)
• Original Assignee: Technicon Instruments Corporation (Bayer AG)
• Inventors: Negersmith, Kent M.
• Primary Examiner(s): Serwin, Ronald
• Application Number:
  US06/194,320
• Time in Patent Office: 407 Days
• Field of Search: 23/230 R, 23/230 A, 422/81, 422/82
• US Class Current: 436/53
• CPC Class Codes: G01N 35/08 using a stream of discrete samples flowing along a tube system, e.g. flow injection analysis
• CPC Class Codes: Y10T 436/118339 with formation of a segmented stream

Abstract

Method is provided for the operation of substantially constant flow rate sample analysis apparatus in such manner that the adverse effects upon sample analysis accuracy of periodic variations in analysis apparatus flow rate and/or sample-analysis reagent proportioning are negated to insure the sample-to-sample consistency and accuracy of the sample analysis results.

Claims

1. A method of treating a flowing stream wherein perturbations in flow and/or composition are periodically introduced, said perturbations having a fixed frequency, comprising the steps of:

(a) flowing said fluid stream along a conduit; and

(b) repeatedly treating said flowing stream in fixed relationship to the periodicity of said perturbations, so as to overcome the effects of said perturbations.

2. The method as in claim 1, wherein the step of flowing said stream includes the further steps of introducing successive and discrete liquid segments along said conduit and reacting said liquid segments, and said treating step includes detecting the product of said reaction step.

3. The method as in claim 1, wherein the step of flowing said stream includes peristaltically pumping said stream, said perturbations being introduced during said pumping step.

4. The method of claim 2, wherein said treating step has a time duration equal to the period of said perturbations.

5. The method of claim 4, wherein said treating step has a time duration which is an integral multiple of the period of said perturbations.

6. In a method for determining the results of the operation of continuous flow fluid sample analysis apparatus which are operable to successively mix a plurality of samples with a reagent in predetermined proportion and to successively analyze the thusly reacted samples, said apparatus comprising pump means having a predetermined operational cycle time and which are operable to concomitantly pump the fluid samples in succession, and the reagent in predetermined proportion thereto, through said apparatus at substantially constant flow rate for analysis based on the sample-reagent reaction for each of said samples, and detecting means which are operable to detect the analysis results in succession for a predetermined detecting time for each of said reacted samples, the improvements comprising, the steps of, fixing the relationship between said operational cycle time and said detecting time in such manner that variations in apparatus flow rate and/or sample-reagent proportioning occuring periodically during each operational cycle of said pump will affect the analysis results for each of said samples in like manner whereby, the sample-to-sample consistency of said analysis results is maintained despite said variations.

7. In a method as in claim 6 wherein, said relationship is fixed so that said detecting time and said operational cycle time are equal.

8. In a method as in claim 6 wherein, said relationship is fixed so that said operational cycle time is an integral sub-multiple of said detecting time.

9. In a method as in claim 6 wherein, said sample analysis apparatus comprises a plurality of pump means, at least two of which have different predetermined operational cycle times, and wherein the relationships between said detecting time and said different operational cycle times are fixed so that one of said operational cycle times is equal to said detecting time, and the other of said operational cycle times is an integral sub-multiple of said detecting time.

10. In a method as in claim 6 wherein, said sample analysis apparatus comprises additional pump means downstream in said apparatus of said first-mentioned pump means, said additional pump means being operable to pump the reacted samples through said analysis apparatus, said additional pump means having a different operational cycle time than said first-mentioned pump means, and wherein the method further comprises, the steps of, fixing the relationship between said detecting time and said different operational cycle times so that one of said operational cycle times is equal to said detecting time, and the other of said operational cycle times is an integral sub-multiple of said detecting time.

11. In a method as in claim 10 wherein, said relationship is fixed so that the operational cycle time of said first-mentioned pump means is made equal to said detecting time, and the operational cycle time of said additional pump means is an integral sub-multiple of said detecting time.