SU779852A1 - Method of automatic sampling of mean samples of running liquid - Google Patents

Description

(54) METHOD OF AUTOMATIC SELECTION OF AVERAGES, - :: SPECIAL FLOWING LIQUIDIG

one

This invention relates to the field of measuring the composition and properties of liquid media and can be used in cyclical analyzers for analyzing a flow liquid. five

There is a known method for taking medium samples of a flowing fluid, which consists in taking single doses of a liquid with a frequency proportional to time and accumulating them during averaging time c; subsequent averaging of the accumulated volume fl3.

The closest in technical essence to the invention is a method of automatically taking medium samples of a flowing liquid by taking single doses of a liquid with a frequency proportional to the time of extraction or consumption of a liquid, and accumulating them with a subsequent averaging of 20 accumulated volume of single doses

t.

The disadvantage of this method is that the averaging range in them is limited, on the one hand, to at least 25 permissible accumulation volume, which is determined by the necessary and sufficient volume of the average sample for the technical feasibility of the analysis operation, and on the other hand

the maximum permissible volume of accumulation, which is determined by the design possibilities and the difficulty of operating with large volumes of collected liquid.

 The aim of the invention is to expand the dynamic range of the averaging.

The goal is achieved by the fact that when the maximum value of the averaged volume of accumulated unit doses is reached, the liquid is drained to a level corresponding to the minimum allowable unit dose accumulation volume, and the unit doses are selected at a frequency determined by the following relationship:

(

Vmax

where f is the frequency of sampling single

DOS in the nth selection cycle (with n 1

C, f - originally

set frequency maximum volume accumulated V lAOKC;

V, is the volume of fluid drained. The drawing shows a block diagram of the device, realizatiruchch-) method

automatic sampling of medium flow samples

The method is carried out as follows.

Initially, the valves 1, 2, 3 are closed, the pulse counter 4 and the electronic device 5 are in the initial state.

According to the signals from the time interval setting device b or from the flow meter (depending on the operation mode), the control unit 7 generates pulses arriving at the pulse counter 4. In the initial state, the counter 4 has a division factor of 1. The pulses from the output of the counter 4 arrive at the metering unit 8, which for each pulse produces a single dose of a certain volume of liquid from the pipeline. The selected doses are transferred to accumulative tank 9. At the same time, pulses from counter 4 are fed to the input of the electronic device 5. When a certain number of pulses arrive at the input of the electronic device 5, which corresponds to the accumulation in tank 9 of the maximum volume V, the average sample, the following control teams:

the command to turn on the mixer 10, mixing the sample

a command for activating valve 2, which connects containers 9 and 11 and, accordingly, separates into the container the 11th part of the volume of the medium sample by the method of communicating vessels;

command to turn on valve 3 to empty the tank .11

Simultaneously from the electronic device 5, a command is sent to the pulse counter 4, according to which the counter-dividing ratio of the counter is increased by „VtAattc“ h

ulo

Farther than GG, the number of pulses arriving at the input of the electronic device 5 corresponds to an increase in the volume of the average sample in the tank 9 again to the value

device 5 forms a Virev.

VavA

the specified series of commands to turn on the valves 2, 3, and the mixer 10 and the command to increase the ratio of the indicator of the counter 4 (. Further, the cycles are repeated. When the command for analysis is received, the counter 4 is reset to the initial state (the division ratio is 1) and device 5 forms control commands as follows

sequences:

the command to turn on the mixer 10, mixing the middle sample;

the command to turn on valves 1 and 2, according to which the prepared sample is fed to the analyzers;

a command to turn on valves 2 and 3, which is used to completely empty containers 9 and 11.

The averaging cycle starts over,

Annual savings from using the method of automatic sampling of medium-sized samples of flow-through liquid in the automatic quality control system and the amount of pumped

oil will be approximately 10 thousand b.

Claims (2)

1. Sampler AP-ZM-1 (pilot plant of the Omsk filigsha SCR ANN, Omsk), 1970. 5s 2. Automatic sampling device 113-76 PS, experienced hawser Nefteavtomatika, 1972, Vugulma (prototype). Cutna f decoder / Ana command / iuJ Kana fjajtora