# US 4,392,387 A · Sampling device for analyzing gas with high dust content

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- Number: US 4,392,387 A
- Document ID: US4392387A
- Status: Granted
- Kind: A
- Application number: 06/253,918
- Filed: 1981-04-14
- Granted: 1983-07-12
- Earliest claimed: 1980-04-28
- Assignees: NGK Insulators, Ltd.
- Inventors: Naoe Izumi
- Web page: https://patentgrep.com/patent/US4392387A

## CPC

- G01N 1/24: Suction devices {(G01N1/22 - G01N1/2294 take precedence)}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

The disclosed sampling device has a gas suction tube through which gas with a high content of dust is sucked into the sampling device so as to cleanse the gas with water in the sampling device before analyzing the gas. At least one air nozzle is provided in the gas suction tube in such a manner that the air nozzle faces the inside surface of the gas suction tube wall and is directed toward the inlet opening of the gas suction tube, so that dust and other deposits sedimented on the inside surface of the gas suction tube is cleansed by air jets ejected from the air nozzle.

## Claims

### Claim 1

A sampling device for analyzing gas with a high dust content, comprising a generally closed housing (2), a gas suction tube (3) of a large diameter connected to an upper portion of the housing so as to lead the gas with the high dust content into the inside of the housing, an air-jet nozzle (4) disposed in said gas suction tube (3) in the proximity of joint between said tube (3) and said housing (2), said nozzle (4) facing tube wall (6) of said gas suction tube (3) and being directed toward inlet opening (5) thereof, a water supply conduit (7) connected to a top portion of said housing (2) so as to supply water for washing the gas with the high dust content led into the housing (2), a screen (9) disposed at a lower portion of said housing (2), a water sump (11) connected to a bottom portion of said housing (2) through a pipe (10), and a washed-gas passage (12) having one end thereof connected to said pipe (10) and an opposite end thereof communicated with outside of the sampling device.

### Claim 2 (depends on 1)

A sampling device as set forth in claim 1, wherein said sampling device further comprises an atomizer nozzle (8) secured to lower end of said water supply conduit (7) so as to supply atomized water particles into the inside of the housing (2).

### Claim 3 (depends on 1)

A sampling device as set forth in claim 1, wherein said sampling device further comprises a visor disposed at joint between said pipe (10) and said washed-gas passage (12) so as to prevent the water from entering into said washed-gas passage (12).

### Claim 4 (depends on 1)

A sampling device as set forth in claim 1, wherein said sampling device comprises a plurality of said air-jet nozzles (4) disposed along inner circumferential surface of said gas suction tube (3).

### Claim 5 (depends on 1)

A sampling device as set forth in claim 1, wherein said air-jet nozzle (4) is adapted to eject an air jet at an angle of 15 to 30 degrees relative to longitudinal axial direction of said gas suction tube (3).