RU37831U1 - DEVICE FOR PREPARING A LIQUID SAMPLE FOR CHROMATOGRAPHY ANALYSIS - Google Patents

Description

A device for preparing a liquid sample for analysis on a chromatograph.

The solution relates to the field of gas chromatography and can be used in chromatographs to determine impurities in liquids, for example, impurities of dissolved gas in transformer oil.

As a prototype, a device for preparing a liquid sample for analysis on a chromatograph according to ed. testimonial. N767640, G01N31 / 08.1980

This device contains a vacuum tank, a sample inlet channel, auxiliary gas and carrier gas supply lines, an outlet line to the analyte gas chromatograph, on which a metering valve with a dosing volume is installed, an analyte discharge line.

The disadvantages of this device are the necessity of using saline solution, which complicates the design and the entire process, there is no automatic control of the metering valve on the line to the analyzed gas chromatograph, as well as the ability to adjust the discharge of the analyzed gas.

These shortcomings are addressed by the proposed solution.

The task at hand is the improvement of the design of the device.

The technical result is the exclusion of the use of saline, the ability to adjust and automate the process.

This technical result is achieved by the fact that in a device for preparing a liquid sample for analysis on a chromatograph containing an evacuated vessel, a sample inlet channel, an auxiliary gas and carrier gas supply line, an analysis gas outlet line to the chromatograph, on which a metering valve with a metering valve is installed volume, a discharge line of the analyzed gas, a sample inlet channel is led through the cover of the container to its base and is equipped with a switching valve connected in the same way with the auxiliary gas supply line to the same channel, p. on the exhaust port to the analyte gas chromatograph is equipped with a pneumatic actuator, and the discharge line is equipped with a throttle regulating the discharge of the analyzed gas.

The drawing shows a -, - block-s / eip device.

The unit contains a vacuum tank 1 made of stainless steel, equipped with heating elements, a platinum resistance thermometer, which serves as a sensor of the temperature control system, and a thermocouple, with which the temperature is controlled. Regulation and temperature control

f f

is carried out using the BPD-19 unit, which is part of the Tsvet-100 gas chromatograph (not shown in the figure). Capacity 1 with heating elements, thermal resistance and a thermocouple is placed in the chamber (not shown in the figure), the space between the walls of the chamber and capacity 1 is filled with insulating material.

The capacity 1 of channel 2 is connected to a switching valve 3, channel 4 with an electro-pneumatic valve 5, channel 6 with an electro-pneumatic valve 7, and channel 8 with an electro-pneumatic valve 9. Switching valve 3 is connected by channel 10 to a liquid sample inlet line, channel 11 to an electro-pneumatic valve 12 and channel 13 with a reset line. The electro-pneumatic valve 12 is connected by a channel 14 to the auxiliary gas line to fill the tank 1 with inert gas. The electro-pneumatic valve 5 is connected by a channel 15 to the vaccum line. The electro-pneumatic valve 7 is connected by a channel 16 with a metering valve 17. The metering valve 17 has a metered volume (dose) 18. The metering valve also has a pneumatic actuator 19. The metering valve 17 is connected to the throttle 21 by a channel 21, by which the gas flow is regulated through a dose of 18. Also, the metering valve is connected by a channel 22 to the carrier gas line and a channel 23 with a chromatographic column (not shown in the figure). The inductor 21 channel 24 is connected to the reset line. The electro-pneumatic valve 9 is connected by a channel 25 to a discharge line.

The switching valve 3 has two operating positions.

Position I - line: the input of the liquid sample is connected to channel 2; the auxiliary gas carrier line through the electro-pneumatic valve 12 and the channel 11 is connected to the discharge line

Position II - linva: the input of a fluid sample is connected to a discharge line; the auxiliary gas carrier line through the electro-pneumatic valve 12 and the channel 11 is connected to the channel 2..

The metering valve 17 has two operating positions.

Position I - channel 16 through a dose of 18 is connected to channel 20; channel 22 is connected to channel 23.

Position II - channel 16 is connected to channel 20; channel 22 through a dose of 18 is connected to channel 23.

The control of electro-pneumatic valves can be carried out in two modes: automatic from the chromatographic unit SAA-06 or manual from the control panel.

The principle of operation of the unit is as follows.

The carrier gas through channel 22 enters the metering valve 17, and then through channel 23 to the chromatographic column.

On the BPD-19 block, the desired temperature is set.

Channel 10 is connected to the source of the analyzed fluid (for example, medical syringes with a volume of 10 ml), channel 14 is connected to the auxiliary gas line, and channel 15 to the vacuum line. Channels 13.24 and 25 are connected to a reset line.

Next, opening the electro-pneumatic valve 5, connect the tank 1 with channels 4 and 15 with a vacuum line. Upon reaching the required vacuum, close valve 5. Vstvivyvaya a small amount of liquid, rinse the channel 10 and the switching valve 3, with the subsequent discharge of fluid through the channel 13 into the discharge line. Then set the switching valve 3 to position II (shown by a dotted line). A sample of the liquid (volume W 1h-2 ml) is introduced through channel 10 through the switching valve 3 and then through channel 2 into the evacuated container 1. The switching valve 3 is returned to position I. Dissolved gases are released from the liquid and accumulate in the upper part of the vessel 1. Then valve 12 is turned on and auxiliary gas is supplied through channels 14, 11 and 2 through valve 12 and the switching valve 3 enters the lower part of tank 1. As a result, a mixture of gaseous gases with inert gas is formed. The gas supply to the lower part is accompanied by gas bubbling through the liquid layer and provides an additional extraction of dissolved gases. In addition, the gas supply to the lower part of the tank 1 promotes the concentration of accelerated gases near the channel 6 in the upper part of the tank 1. After filling the tank 1, the valve 12 closes. Then valve 7 opens. The gas mixture under excess pressure passes through the channels 6, 16 into the dosed volume 18 and then through the channels 20, 24 enters the discharge line. After valve 7 closes. The metering valve 17 using the pneumatic actuator 19 is transferred to position P. The dose of the gas mixture enters the gas chrymatograph for analysis. At the end of the analysis, the metering tap returns to its original position I. Opening the valves 12 and 9, the analyzed liquid is discharged through channels 8 and 2S to the discharge line. At the end of the discharge, valves 12 and 9 close.

Before analyzing a fluid sample, you must purge the system. I will open the valve) 12 and 7, auxiliary carrier gas through channels 14, 11, 2, 6, 16, 20 and 24 through the switching valve 3, capacity 1, the dosed volume 18 of the metering valve 17 and the inductor 21 cleans the system of gases remaining in the previous analysis. At the end of the cleaning procedure, the valves 12 and 7 are closed.

Claims (1)

A device for preparing a liquid sample for analysis on a chromatograph containing an evacuated container, a sample inlet channel, auxiliary gas and carrier gas supply lines, a sample gas outlet line to the chromatograph, on which a metering valve with a dosing volume is installed, a sample gas discharge line, characterized the fact that the sample inlet channel is connected through the container lid to its base and is equipped with a switching valve connected also to the auxiliary gas supply line to the same channel, a metering valve on the discharge line to the chromatograph The sample of the analyzed gas is equipped with a pneumatic drive, and the discharge line is equipped with a throttle that regulates the discharge of the analyzed gas.