Waste water sampling system
US4024766A · kind A · utility
Inventor
Key dates
| Filing date | Jan 19, 1976 |
| Grant date | May 24, 1977 |
| Priority date | — |
| Expiry date | Jan 19, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N1/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A liquid sampler including a force main sampling chamber, a seal leg having an end portion immersed in liquid in said sampling chamber, a dam in the sampling chamber for maintaining the liquid at a predetermined minimum elevation therein, a draw tube in communication with the seal leg, a pump for supplying either compressed air or vacuum to the draw tube, first control means for causing the pump to supply vacuum to the draw tube only when a sample is to be taken, a side arm in the draw tube for receiving liquid, second control means including non-contact liquid-level sensing means in the draw tube for causing the pump to supply pressure rather than vacuum after the liquid reaches a predetermined level in the draw tube, and circuit means for terminating operation of the sampling cycle in the event a sample is not taken within a predetermined time period after the sampling cycle is initiated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.