SU172110A1 - DEVICE FOR DETERMINING VOLUME OF OXYGEN VOLTAGE IN GASES AND LIQUIDS - Google Patents

Description

Devices for determining the magnitude of the oxygen voltage in gases and liquids based on polarographic analysis, containing a thermostat, a voltmeter for monitoring the voltage in the power supply circuit, a recording galvanometer, and a direct current source are known. The proposed device differs from the known ones by the presence of a sensor made of a platinum needle and a silver bushing, insulated from each other by a glass tube placed coaxially in qi: a 1-body organic glass body in contact with a gas or liquid its end of the body is sealed with a teflon film and gelatinous membrane. Such an embodiment of the device makes it possible to measure the oxygen stress in a continuous stream of breathing gas or liquid. The drawing shows the proposed device. The sensor device contains a cylindrical body 1 made of organic glass. At the bottom of the housing there is a thread that allows the sensor to be fixed in the container with the liquid or gas under investigation. A gasket 2 is used to create tightness. To the end of the body, a rim 3 is attached to the glue along the axis of which silver is mounted on the hub 4, containing a platinum needle 5 located inside. 6. The end of the needle is free of glass and ground. At the base of the spacing-1 housing, there are two jacks for plug 7. One jack is connected to the needle by a guide and the other to a silver sleeve. On the opraz. 3, a glass cylinder 8 is tightly mounted with a narrowed end, having a shape that allows the Teflon film 9 to be sealed at the end. Between the end of the needle and the film there is a circle, a plate made of cellophane - gelatin membrane 10, which stabilizes the oxygen diffusion path and creates: a constant distance between the surface of the needle (cathode) and the teflon film. Through the systolic hole in the glass cylinder, its cavity is filled with a saturated solution of ca. chi chloride or with saturated potassium chloride agar-agar. When the sensor is turned on into the measuring circuit, it is necessary to determine the absolute values of the oxygen partial pressure, which can be freely diffused through the teflon film and gelatin membrane from the external medium to the KC1 solution, and then restored at the latin cathode.

Since the temperature of the sensor can have a significant effect on the readings of the device, the device provides for the possibility of thermostating the sensor, for which the heating element 11 is put on the glass cylinder 8 in the form of a wire made of nichrome embedded in a special case. The temperature of the solution is measured by a thermal resistance 12 included in the pavement measuring circuit. A highly sensitive, polarized relay is included in the measuring diagonal of the bridge. When the temperature of the KC1 solution drops below a certain level, the signal at the output of the measuring bridge is sufficient to activate the relay, which turns on the heating element circuit, and the temperature inside the sensor rises. When it reaches the level above the set point, the relay will open its contacts and turn off the heating element. Thus, the thermal control system maintains the required temperature.

The sensor can be mounted in the wall of a rubber-, mask, pressure mask, spacesuit or on the path of the exhaled or inhaled gas, in anrf paTe artificial respiration or

same to the cannula, which moves the fluid or blood. Therefore, the device makes it possible to determine the partial pressure of oxygen not only in gases, but also in various liquids, including the blood flow of animals or humans, since the Teflon film is impermeable to the liquid, but passes oxygen well.

Subject invention

A device for determining the magnitude of: oxygen in gases and liquids, containing a thermostat, a voltmeter for monitoring the voltage in the power supply circuit, a recording galvanometer, and a direct current source, characterized in that it is possible to measurement of the oxygen pressure in a continuous stream of breathing gas or fluid, for example

blood, it has a sensor made of a platinum needle and a silver sleeve, isolated from each other by a glass tube, placed coaxially in a cylindrical body made of organic glass, and its end in contact with a gas or liquid is sealed with a teflon film and a gelatin membrane.