CS242187B1 - Air sampler - Google Patents

Abstract

The solution concerns an air sampling device based on a cylindrical container made of solid material with a cap, a balloon inside the cylindrical container, a valve and a tube with a sorbent for capturing pollutants.

Description

242187

BACKGROUND OF THE INVENTION The present invention relates to an apparatus for collecting air-based cylindrical containers of solid, lightweight material with a closure.

It is known that air samples for determining the concentration of chemical pollutants in the working zone of the workplaces are taken by means of electric power or battery pumps equipped with gas-metered measurement of the total gas volume and the control of gas flow, ejectors for pressure air, water pumps, and effluent. aspirates (Križan V. et al.: Air Analysis, Alfa1981, 34 47),

Evacuated coil hollow cylinders or evacuated glass ampoules with two sealed ends are used for direct short-term sampling (Križan V. et al .: Air Analysis, Alfa 1981, p. 36J). One-shot air withdrawals can be used for just-weighted weighing with ambient air by siphoning off ten times the volume of air, and short-term air sampling can also be done with bags from different foils. presses with a ball pump or other inflator.

The disadvantages of battery and power pumps are mainly the need for an energy source and the need for effective sealing for the explosive environment. For disposable withdrawals using evacuated glass cylinders and ampoules, meraf pressure and a perfect flushing of the sample with inert gas prior to assay is required. I need blower aspirators, pressure injectors and water pumps! the installation at the points of extraction, sources of water and compressed air will be exhausted. Samples collected in bags of polyethylene films, or other materials, need to be processed in time to prevent losses through diffusion and adsorption of the material used, including the inflation ball. Losses caused by adsorption on the walls of glass cylinders and tap leakage are often the source of various anomalies.

The above drawbacks are eliminated by the air sampling device based on a cylindrical vessel of solid material with a closure of the invention. SUMMARY OF THE INVENTION The invention is based on the fact that the device comprises a balloon disposed within a cylindrical vessel connected by a filling pipe, passing through a closure, with a valve for inflating the package, from a suction pipe for sucking air through the closure, in the upper part by means of sealing rings with a sorbent tube. collecting the pollutants, wherein the suction tube is connected to the vent tube with the vent opening at the bottom to vent the cylindrical container at the suction tube. The advantage of the underlay device lies in its simplicity, accuracy and the possibility of its easy placement in the respiratory zone of the workplaces. The equipment is minimally maintenance-intensive and can also be used in explosive environments.

One modification of the device according to the invention is shown in the attached figure.

The air sampling device of the cylindrical container 2 made of solid material with the closure 3 consists of a balloon 1 positioned inside the cylindrical vessel 2 connected by a inflation tube 8 to pass through a cylinder 3 cap 2 with a balloon inflation valve 9, of suction tube 4 for suction the air passing through the closure 3 of the cylindrical vessel 2, in the upper part above the closure 3 through the sealing rings 5 connected to the tube 6 with the sorbent 7, the suction pipe 4 is connected in the lower part to the vent pipe 10 with the vent a vent 11a of the suction tube 4 for venting the cylindrical vessel 2.

The balloon 1 is filled with air through the filling tube 8 at the opening of the valve 9 by the foot ball pump until it completely fills the volume of the cylindrical vessel 2. After equilibrating the temperature with the ambient air and closing the valve 9 over the cap 3 on the suction tube 4 passing through by means of the seal 3 by means of sealing rings S, the tube 6 is connected to the sorbent7. The valve 9 is opened. By discharging the air from the blown balloon 1, the volume is increased with the wall of the balloon 1 and the walls of the cylindrical container 2, resulting in a vacuum which is balanced with the ambient air by sucking air into the cylindrical vessel 2 through the suction pipe 4 and the pipe 6s Sorbent 7. Instead of sorbent 7, the suction tube may be connected directly to the atmosphere via a liquid absorber. The total oversized air volume is determined by the volume of the cylindrical vessel 2 used, reduced by the volume of the empty vessel 1 and the vent pipe 10 with the vent port 11. The flow rate can be measured with a flow meter and changed as required by a control valve. The device can be used for both short and long term air sampling. The amount of pollutants is determined by their physicochemical analytical methods by determining their content in the sorbent 7 or the quadhaline absorber.

Claims (1)

SUBJECT Air sampling device based on a cylindrical container made of solid material with a closure, characterized in that inside the cylindrical container (2j) is located a balloon (1) connected by a inflation tube (8) passing through the closure (3) of the cylindrical container (2) with valve (9) for inflating the balloon (1), from the suction pipe (4) for sucking the air passing through OF THE INVENTION through the cap (3) of the cylindrical vessel (2), at the top above the cap (3) by sealing rings (5) connected to the tube (6) with the sorbent (7J) for collecting pollutants, connected to a vent pipe (10) with a vent hole (11) for venting the cylindrical vessel (2) at the mouth of the suction pipe (4).