Automated multiple stream analysis system

• US 4,722,830 A
• Filed: 05/05/1986
• Issued: 02/02/1988
• Est. Priority Date: 05/05/1986
• Status: Expired due to Fees

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Young, William A., Urie, Michael W.
• Primary Examiner(s): Marcus, Michael S.
• Application Number:
  US06/859,544
• Time in Patent Office: 638 Days
• Field of Search: 422/67, 422/73, 422/103, 422/62, 422/81, 73/864.63, 73/864.64, 73/864.65, 73/863.71, 73/863.72, 73/863.73
• US Class Current: 422/62
• 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: G01N 35/1097 characterised by the valves valves in general F16K

Abstract

An automated analysis system includes a pair of sample selection subsystems whose operations are coordinated by a host computer pursuant to developing analytical data useful to a process computer in controlling an industrial process. Each subsystem includes a sample selection computer operating to control one or more multiport valves in extracting fluid samples on a scheduled or demand basis from sample loops connected with the various process streams involved with the process. The extracted samples are injected into a spectrometer for analysis. An instrument computer converts the spectrometer responses to analytical data indicative of the constituent concentrations found in an analyzed sample.

Claims

1. An automated multiple stream analysis system comprising, in combination:

A. a plurality of sample loops respectively connected in fluid communication with a plurality of process streams for accommodating continuous flow of sample fluids therethrough representive of the fluids flowing in the various process streams ona real-time basis;

B. at least one multiport valve having a plurality of sets of interconnected inlet and outlet ports, each connected in series with a different one of said sample loops, a common outlet port, and means connecting any selected one of said inlet ports in fluid flow communication with said common outlet port for extracting a sample of the fluid flowing into said said selected inlet port and routing the flow of said extracted fluid sample to said common outlet port;

C. an analytical instrument connected with said common outlet port to receive said extracted sample for immediate analysis;

D. an instrument computer for developing analytical data pertaining to each sample analysis;

E. a sample selection computer operating to automatically control said multiport valve connecting means to extract fluid samples from said sample loop in accordance with an operator established schedule and to compare said analytical data for each sample analysis with a corresponding analytical control table to signal if any of the element concentrations in an analyzed sample exceeds pre-established limits; and

F. a process computer linked to said sample selection computer and operating in response to said analytical data to control the process involving the process streams.

2. The automated multiple stream analysis system analysis system defined in claim 1, which further includes at least one reservoir of a rinse solution connected with a separate inlet port of said multiport valve, said sample selection computer controlling said connecting means to draw a quantity of said rinse solution from said reservoir for delivery through said common outlet port to waste, thereby removing all vestiges of a previously extracted sample.

3. The automated multiple stream analysis system defined in claim 2, which further includes a plurality of containers, each holding a different standards solution containing a known concentration of each element to be found in the process streams and individually connected with a different inlet port of said multiport valve, said sample selection computer automatically controlling said connecting means to successively draw a standards sample from each said container for injection into said analytical instrument via said common outlet port for analysis, said instrument computer and said sample selection computer operating in concert to establish a separate calibration curve for each element to be analyzed for in said extracted samples.

4. The automated multiple stream analysis system defined in claim 3, which further includes means for drawing a sample from a manually collected specimen under the control of said sample selection computer in response to an operator request.

5. The automated multiple stream analysis system defined in claim 3, wherein said sample selection computer is programmed to accept operator requests to extract a sample from a sample loop of any selected process stream and to control said connecting means in extracting a requested sample at the earliest opportunity and in preference to the extraction of an automatically scheduled sample.

6. The automated multiple stream analysis system, defined in claim 5, wherein said connecting means is in the form of a rotor, and said multiport valve further includes a manifold block and a valve block removably secured to said manifold block and rotatably mounting said rotor, said manifold block including said sets of inlet and outlet ports and said common outlet port;

said valve block including separate passages connecting said inlet and outlet ports of each said set in fluid communication, a separate extension of each said passage having an outlet end, and a single common passage communicating with said common outlet port; and

said rotor including a single passage having an inlet end communicable with any one of said passage extension outlet ends and an outlet end communicating with said common passage; and

indexing means for selectively angularly positioning said rotor to extract a sample from one of said passage extension outlet ends and convey said extracted sample to said common outlet port.

7. The automated multiple stream analysis system defined in claim 5, wherein said sample loops and said standards containers are connected with inlet ports of either one of first and second multiport valves, said rinse reservoir being connected with an inlet port of each said first and second multiport valves, and a third multiport valve having separate inlet ports individually connected with said common outlet ports of said first and second multiport valves and a common outlet port connected with said analytical instrument, said first, second and third multiport valves being automatically controlled by said sample selection computer.

8. The automated multiple stream analysis system defined in claim 5, wherein said multiport valve, said analytical instrument, said instrument computer and said sample selection computer compose a first subsystem, said analysis system further comprising a second subsystem of identical composition and a host computer coordinating the operations of said first and second subsystems whereby to share the sampling load therebetween.

9. The automated multiple stream analysis system defined in claim 8, wherein said sample loops connected with the process streams are connected in series with said multiport valves of both said first and second subsystems.

10. The automated multiple stream analysis system defined in claim 9, wherein said host computer is capable of controlling said first subsystems to extract said fluid samples in accordance with said established schedule while said second subsystem is being controlled to extract and analyze said standards samples pursuant to establishing said calibration curves.