RU173934U1 - A device for checking thermometers at a point of 1000C in boiling water vapor - Google Patents

Abstract

The proposed utility model relates to special laboratory equipment used to verify the readings of thermometers without using a control thermometer by immersing the tested thermometers in a pair of clean water boiling at atmospheric pressure. Checking the thermometers at a point of 100 ° C is carried out in vapors of boiling clean water in a heating device with a free exit of steam into the atmosphere. The utility model refers to a permanent product that can be used as non-standard equipment in specialized laboratories. The feature of the device is that it consists of a metal vessel of cylindrical shape with a heating element installed in it for heating water and a gauge glass to monitor the level of water in the vessel, an open pipe is soldered to the vessel from above, surrounded by a jacket soldered to the metal vessel at the base, at the bottom of the base of the shirt there is a trigger pipe for steam to escape, on top of the shirt is tightly closed with a lid, in which there are fittings for installing thermometers. The thermometers under test are inserted tightly through the plugs into the fittings of the lid so that the dividing line of 100 ° C rises several millimeters above the surface of the plug. The device heats up when it is connected to the mains. When boiling water, steam fills the working chamber of the device and exits outward from the trigger pipe. After 15 minutes the thermometers are in boiling water vapor, the readings of the thermometers being checked are counted. EFFECT: provision of the ability to check thermometers at a point of 100 ° C by immersing the tested thermometers in vapors boiling at atmospheric pressure of pure water. 1 ill.

Description

The proposed utility model relates to special laboratory equipment used to verify the readings of thermometers. In laboratories, verification of thermometers by the boiling point of water is carried out in a device consisting of a glass flask into which a wide glass tube is inserted with a drawn lower end. The tube is placed in a glass casing, thereby achieving good thermal insulation. The thermometer to be checked is inserted through the upper cork of the casing, and condensate is drained through the tube in the lower cork. The thermometer should be immersed so that the reading can be done through the glass. With this device, one thermometer can be verified [1, 2]. Thermometers are also calibrated in thermostats according to the test thermometer. In the absence of a control thermometer, verification is not possible.

The technical task of the utility model is to provide the ability to check thermometers at a point of 100 ° C by immersing the thermometers under test in pairs boiling at atmospheric pressure of pure water.

The technical problem is solved by the fact that a special device for checking thermometers (Fig. 1) is used, consisting of a metal vessel of cylindrical shape (1) in which a heating element (2) is installed, and on the side there is a gauge glass (7) to monitor the level of water in the vessel , an open pipe (3) is soldered to the vessel from above, surrounded by a jacket (4), soldered at the base to a metal vessel with a heating element. At the bottom at the base of the shirt there is a trigger pipe (6) for steam to escape, on top of the shirt is tightly closed by a lid (5), in which there are six fittings (8) for installing thermometers.

When the device is operating, water is heated in the vessel (1) by the heating element (2), steam enters the pipe (3), then through the upper open part of the pipe to the jacket (4) and exits through the drain pipe (6).

The tested thermometers are inserted into the plugs so that the dividing line of 100 ° C is several millimeters above the surface of the plug, and placed in the cap fittings (8), the plugs are tightly fixed.

The device heats up when it is connected to the mains. When boiling water, steam fills the working chamber of the device and exits outward from the trigger pipe. The tanks of the thermometers should be located at a sufficient distance from boiling water so that splashes do not fall on them. After 15 minutes the thermometers are in boiling water vapor, the readings of the thermometers being checked are counted.

Used Books:

1. F.Yu. Raginsky, M.F. Raginskaya Technique of laboratory work, Leningrad: "Chemistry", 1982.

2. Stepin BD, Technique of a laboratory experiment in chemistry. Textbook manual for universities. M .: "Chemistry", 1999.

Claims (1)

A device for checking thermometers at a point of 100 ° C in boiling water vapor, characterized in that it consists of a cylindrical metal vessel with a heating element installed in it for heating water and a gauge glass to monitor the level of water in the vessel, an open pipe is soldered to the vessel from above surrounded by a shirt soldered to a metal vessel at the base, a drain pipe is installed at the bottom of the shirt base to allow steam to escape, the top is tightly closed by a lid in which there are fittings for installing ter mometers.

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