Measuring and testing – Sampler – sample handling – etc. – Capture device
Patent
1995-08-14
1997-02-25
Raevis, Robert
Measuring and testing
Sampler, sample handling, etc.
Capture device
G01N 114
Patent
active
056061382
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for water sampling. The invention relates to such a water sampling apparatus that permits intake of so-called composite samples as well as individual samples from different depths. A composite sample denotes a sample which has been acquired by taking a small water sample e.g. at one hour intervals for one day into a sample receiver where the samples are mixed and wherefrom the actual water sample is taken for the desired water analyses. Composite samples are needed particularly in monitoring of the quality of natural waters and in monitoring and control of the operation of a water purification plants.
The patent publication U.S. Pat No. 4,462,265 discloses a system wherein a mechanical power unit lowered deep in the water is towed by a ship moving on the surface, the unit having a pump to pump water up. The water flows through several collection devices placed in series at various depths between the unit and the ship. The pressure of this water flow is adjusted by means of a throttle on the ship to a value high enough to actuate the valves of the collection devices and thereby permit the water samples in them to be conducted up to the ship. The pump gets its driving power from the towing movement of the ship by means of a turbine. The water sampling apparatus is large and is intended for moving and manned sampling from great and deep water systems.
Water samples are still collected so that the sample collecting person goes to the monitoring site at certain intervals to take a small sample into the collecting container. Sampling itself does not generally take much time so that the sampling costs are primarily made up of wage and travelling costs. Sampling devices operating on the piston principle are available. Since this kind of device needs a voltage of 220 V, it is difficult to install in terrain circumstances. The device also comprises a glass hoisting device which is heavy and breaks easily. The device is very expensive and therefore its use has remained limited.
The patent publication U.S. Pat. No. 4,462,265 discloses a system wherein a mechanical power unit lowered deep in the water is towed by a ship moving on the surface, the unit having a pump to pump water up. The water flows through several collection devices placed in series at various depths between the unit and the ship. The pressure of this water flow is adjusted by means of a throttle on the ship to a value high enough to actuate the valves of the collection devices and thereby permit the water samples in them to be conducted up to the ship. The pump gets its driving power from the towing movement of the ship by means of a turbine. The water sampling apparatus is large and is intended for moving and manned sampling from great and deep water systems.
The objective of the invention is to present an apparatus that allows automatic water sampling without the need for a continuous manning of the monitoring site. A further objective is a sampling apparatus which is small and moderate-priced. These objectives are obtained by means of an apparatus which is primarily characterized in what is presented in the characterizing part of claim 1.
In the apparatus according to the invention the sampler is a pump which is driven by an electric motor and which is placed into connection with a buoyant container. The apparatus is powered by an accumulator so that electric power lines are not needed at the sampling site as in the case of prior art apparatuses. Because the apparatus is cheap on one hand and easy to transport on the other hand, sampling apparatuses needed in several monitoring sites can be installed in one go and also the samples can be collected in one go.
The invention will be described in greater detail in the following referring to the enclosed drawings in which
FIG. 1 shows a vertical cross-section of the apparatus and
FIG. 2 shows a horizontal cross-section of the apparatus.
The apparatus according to the invention consists of a buoyant sampling device 2 driven by an electric motor 3. In the exemplary ca
REFERENCES:
patent: 2841012 (1958-07-01), Romer
patent: 2872818 (1959-02-01), Johnson
patent: 3349624 (1965-06-01), Fraga
patent: 4056982 (1977-11-01), Jones
patent: 4462265 (1984-07-01), Rein
patent: 4660422 (1987-04-01), Eads et al.
Chong Suet M.
Nath Gary M.
Raevis Robert
Tapio Saarenketo Oy
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