SU763791A1 - Apparatus for detecting the presence of water added to milk in determining naturalness of milk - Google Patents

Description

one

The invention relates to the dairy industry, and in particular, to devices for controlling the quality of milk.

A device is known for detecting the presence of water added to milk when determining its naturalness, consisting of a thermostatically controlled measuring chamber with compensatory and measuring thermostas QJs located in it, a unit for preparing samples with devices for heating and inputting the test milk and solvent water, measuring and thermoregulatory system And.

A disadvantage of the known instrument is the complexity of its operation during mass analyzes, as well as the need to periodically disassemble the instrument to remove waste solutions 20 and clean the instrument.

The aim of the invention is to simplify the operation and speed up the analysis.

This goal is achieved by the fact that in the block for sample preparation there is a full screw heat exchange channel for heating water, and the measuring chamber in the lower part has a port for the flow of solvent water and test milk, while

The input for the test milk is made in the form of a container with an elastic bottom.

FIG. 1 shows a general view of the device in FIG. 2 - device for entering the test milk.

Claims (2)

The device contains a thermostated measuring chamber 1, which is a cavity of the main unit 2, equipped with electric winding 3 for heating it to a predetermined temperature with an electronic controller for the signal of the thermistor 4. At the bottom, the measuring chamber is bounded by a fluoroplastic sleeve 5 with a branch pipe 6 for outputting the used test milk and water solvent. At the top, the measuring chamber is bounded by the lower end of the unit 7 for sample preparation. The main unit 2 and the unit 7 for sample preparation are bolted together and the connection is sealed with a fluoroplastic gasket 8. The unit 7 for sample preparation also. It is equipped with an electric winding 9, which, according to the signal from the battery of differential thermocouples 10, warms it to a predetermined temperature somewhat higher than the main unit 2 by means of an electronic controller. In block 7, pockets 11 were drilled around the periphery to place containers in them (Fig. 2) with preheating samples. Pocket 12 with tubule 13, reinforced with nut 14, serves to inject the test milk onto. measuring thermistor 15. Heat exchanging channel 16 for heating. A solvent-water continuously supplied to a compensation thermistor 17 consists of a through hole with a thread in block 7 for sample preparation, in which there is a smooth-wall fluoroplastic sleeve 18. On top, the heat exchange channel 16 is equipped with a nipple 19 for connecting a tube water supply, and the bottom - a tube 20, fastened with a nut 21, for supplying water to the thermistor 17. The compensation and measuring thermistors, respectively, 17 and 15 are fortified tightly to block 7 for sample preparation, the tips are provided with 22 spiral stainless steel to hold the liquid. To eliminate overheating of the water supplied to the compensation thermistor 17, a stainless steel spiral 23 serves. The device for injecting the test milk is made in the form of a container with an elastic bottom and consists of a shell 24 (aluminum), a nipple 25 (stainless steel), nuts 26 (aluminum) and a rubber elastic bottom 27. The device is insulated and placed in a casing. The proposed device works as follows. From the pressure tank using a PTFE capillary tube (not shown in the figures), through the heat exchange channel 16, a very low current (2-3 ml / h) of distilled water is continuously supplied to the compensation thermistor resistor. This water, somewhat overheated compared to the temperature in the instrument, hits the safety spiral 23 of the compensating thermistor 17, where the temperature is equalized, and then wets the spiral 22, and the excess flows through the nozzle 6. The vapor settles in the form of small droplets on the inner wall The main unit 2 will continue to provide the saturated vapor pressure in the osmometer corresponding to the selected operating temperature. The containers (Fig. 2) for the samples are supplied with rubber pads and with a pipette, the samples of the test milk are introduced into them, and in some of them the standard solution corresponding to native milk and imitation of diluted milk with a certain previously known dilution. Containers with the test and standard solutions are placed in the heating pockets 11 of the device. After some rem, a container about the standard of native milk is placed in the pocket 12 and a slight pressure is applied - the upper sharp tip of the tube 13 pierces the rubber elastic bottom (Fig. 2) and the sample falls on the measuring thermal resistor 15. The container is removed from the device and charged with the next sample, becoming on pre-heating in osvo-. butted pocket 11. An equilibrium state will be established in the device in a minute and a half. Adjust the measuring bridge so that the measuring device shows O% of water. In a similar way, imitation of diluted milk containing C% water is introduced into the device, and after one and a half minutes the sensitivity of the bridge is adjusted so that the measuring device shows water. Similarly, the test samples of milk are introduced into the device, the device will directly show the amount of water added to the milk. The waste milk during operation will continuously flow out of the nozzle 6. Samples are chosen so large (about 0.3 ml) that each subsequent sample will be removed from the measuring thermistor 15 of the previous one completely, due to which intermediate rinsing between determinations disappears. The analysis of milk (the content of water added to it) takes no more than 2 minutes. At the end of the work, the entire care of the device is reduced to flushing the tube 13 with distilled water. Claim 1. Device for detecting the presence of water added to milk when determining its naturalness, consisting of a thermostatically controlled measuring chamber with compensatory and measuring thermistor Mni block located in it for sample preparation with devices for heating and entering the milk under examination and solvent water; The measuring and thermostatic system, characterized in that, in order to simplify the operation and speed up the analysis, a screw heat exchange kangsh for heating water was made in the sample preparation unit, and the measuring chamber in the lower part has a nozzle for water-solvent flow and test milk. 2. The device according to claim 1, is also distinguished by the fact that the device for injecting the test milk is made in the form of a container with an elastic bottom. Sources of information taken into account in the examination 1. The prospectus of the company Herbert ICnauer So, GmbH (0311) 8ST705, 1971. .one eleven