SU532040A1 - Pneumatic gas analyzer - Google Patents

Description

The invention relates to devices for analyzing a Gasoy composition, in particular pneumatically, and can be used in chemical, chemical, gas and other fields of industry.

Limestone P «evmatic gas analyzer; SIRN. Analyzer containing a jet part) and a (element) The supply of the analyzed and comparative gases (1).

However, with the known device it is possible to determine only the threshold values of 1 "concentration" of the gas being analyzed and it is impossible to determine the current reading of these concentrations.

It is also known a device for analyzing the composition of gaseous and liquid media, comprising pressure sensors installed on the gas supply line and a sensitive element, made in the form of two capillaries installed on one axis but with gaps between them (2).

A disadvantage of this device is that it has a high temperature and barometric temperature.

Also known is an air-jet pneumatic gas analyzer, which contains sensing elements installed on the M1 trunk and supplying the analyzed and sraBNITEL raiSOB, made in the form of coaxially arranged iiteli capillary and receiving tube, enclosed in KOipnyc with a branch line

gas, and each equipped with a pressure regulator with an actuator on the corresponding gas supply line, differential pressure gauge (3).

This pneumatic gas analyzer is not sensitive enough to changes in the composition of the analyzed gas due to the inability to control the pressure at the inlet to the corresponding sensory element at a given differential between the pressures in the housing and the receiving tube of the sensing element.

To increase the sensitivity to changes in the composition of the analyzed gas in the proposed pneumatic gas analyzer, containing sensitive elements installed on the supply lines of the analyzed and comparative gases, made in the form of coaxially arranged feed capillary

and a receiving tube enclosed in a KOipnyc with a gas exhaust line, and each equipped with a pressure regulator with an executive body on the corresponding gas subpipe, differential pressure gauge, the regulators are controlled according to a predetermined differential between the pressures in the housing and the pressure tube of the corresponding sensitive the element, and the differential makolGetr is closed between the feeding capillaries and the them-effective elements. A block diagram of a gas analyzer is shown in the drawing. The gas analyzer contains entrusting magistrales supplying the analyzed 1 and comparative 2 gases, the executive bodies 3 and 4 of the pressure regulators 5 and 6, and the sensing elements 7, made in the form of coaxially located supplying capillary 8 and receiving chamber 9, enclosed in the housing 10 with a gas outlet trunk 11, differential 1 meter 12, switched on 1M. Between the inputs of the supply capillaries 8 chuvs-tel (noel points 7. The pressure of the set points 13 and 14 is supplied to the inputs of the regulators 5 and 6 and pressure in the case 10 h 9. The gas analyzer is working as follows: With the help of the regulators 5 and 6, acting on the operating trenches 3 and 4, installed on the supply lines of the analyzed 1 and comparative 2 gases, the supply at the entrance to the feed the capillaries 8 of the sensing elements 7 are maintained so that the differential between the pressures in the housing 10 and the receiving tube 9 is maintained equal to the pressure for the pressure and the pressure setting 13 and 14. When the composition of the analyzed gas is varied to maintain a given differential between pressures: in the housing 10 and the receiving tube 9 sensing element 7, on aspolozhennogo p. gas supply lines. 1, the pressure at the inlet to the feed capillary 8 of this sensing element 1 is changed by the regulator 5. This leads to a change in the pressure drop perceived by the L 2 pressure gauge and is a measure of the composition of the gas. 40 The invention makes it possible to increase the sensitivity of the gas analyzer to a change in the composition of the gas to be quashed by choosing such a value of the set value of the difference between the pressure M. and in the receiver tube 45, rk ensures that the sensitive element operates under optimal conditions, i.e. the work in that part of its characteristic in which the sensitivity value IK changes in composition, is maximum. Such a part of x arcteristics. The jet sensitive element 7 is, for example, the zone of transition of a laminar flow of a jet in an element into a turbulent one. Despite the narrowness of this zone and its displacement with changes in the composition of the gas, the temperature-to-pressure sensing elements are automatically held with it with the help of regulators 5 and 6. Increasing the sensitivity will significantly expand the scope of application of pneumatic gas analyzers to measure with the HELP including pre-burst concentrations of many flammable gases and vapors. Formulas .а and 3 о i6 rete fn and Pneumatic gas analyzer, containing the installed n, and the magician: I1ST | enclosed in a casing with a gas outlet side, and supplied each with a pressure regulator with an additional body on the corresponding gas supply line, differential pressure gauge | p, characterized in that, with the sensitivity increase slot to change iCOCTasa analysis | rumbered g The regulators are designed to be controlled by a predetermined period between the pressures in the housing and the receiving tube of the corresponding sensing element, and the differential pressure gauge B1 is connected between the supplying capacitors 1m. Sources of information taken into account in the examination: 1. Aut. St. No. 3095723, kl. G 01 D 5/44, 1972. 2. Avt. St. No. 269567, cl. G 01N 7/00, 1968. 3.Avt. St. № 450096, “l. G 01 N 11/00, 1969.

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