Beckman thermometer usage method 5

How to use. Here are two methods of mediation for the temperature range:

1. Thermostatic bath mediation method.

1 Start by determining the temperature range used. For example, to measure the reduction of the freezing point of an aqueous solution, it is necessary to be able to read a temperature reading between 1 and 5; To measure the increase in the boiling point of an aqueous solution, it is desirable to read a temperature reading between 99 and 105; As for the determination of the heat of combustion, a mercury column between 2 and 3 is most suitable at room temperature.

2 According to the range of use, estimate the temperature value when the mercury column rises to the elbow at the end of the capillary. In a typical Beckman thermometer, the mercury column rises from the highest part of the scale to the end of the capillary, and it needs to rise by about 2. Based on this estimate, the amount of mercury in the ball is adjusted.

For example, when the freezing point of the water is lowered, the maximum temperature reading is adjusted to 1, then the temperature at the elbow at the end of the capillary should be equivalent to 3.

4. Use another thermostatic bath, adjust it to the temperature that should be reached by the elbow at the end of the capillary, and place the Beckman thermometer in the thermostatic bath at a constant temperature of 5 or more.

5 Take out the thermometer, grasp the middle of it with your right hand so that it is nearly vertical, and tap your right forearm with your left hand, as shown in Figure 3 3. At this point, the mercury can be disconnected at the elbow. As the volume of mercury changes rapidly after the thermometer is removed from the thermostatic bath due to temperature differences, this adjustment step needs to be quick and brisk, but not panicked to avoid mistakes.

6.Place the adjusted thermometer in a thermostatic bath at ** temperature, observe its reading value, and estimate whether the range meets the requirements. For example, in the second experiment of the freezing point reduction method, the molar amount can be tested with an ice water bath of 0, if the temperature value falls at 3 5, it means that the range is appropriate.

If the deviation is too large, it should be readjusted according to the previous steps.

Second, the ruler reading calligraphy.

This method can be used for those who are more proficient in the operation. This method directly uses the temperature scale on the upper part of the Beckman thermometer without having to adjust it with a thermostatic bath, and the operation steps are as follows:

1 Start by estimating the maximum operating temperature value.

2. Turn the thermometer upside down, so that the mercury ball and the mercury in the capillary tube are slowly injected into the ball at the end of the capillary, and then slowly tilt the thermometer to connect the mercury in the tank to it.

3 If the estimated value is higher than room temperature, warm water can be used, or an inverted thermometer can be used to use gravity to let the mercury flow into the mercury storage tank, and when the mercury surface at the temperature scale reaches the required temperature, tap gently as shown in Figure 3 3 to disconnect the mercury column at the elbow; If the estimated value is lower than room temperature, the thermometer can be immersed in a lower thermostatic bath and the mercury level can be lowered to the point where the reading on the thermometer scale is just right to the estimated value of the desired temperature, and the mercury column can be disconnected in the same way.

4 As with the above method, whether the amount of mercury adjusted by the experiment is appropriate.

Precautions. 1. The Beckman thermometer is made of thin glass, which is much longer than the average mercury thermometer and is susceptible to damage. Therefore, it should generally be placed in a thermometer box, or installed on the rack of the instrument used, or held in the hand. It should not be placed arbitrarily.

2. When adjusting, be careful not to let it be subjected to extreme heat or cold, and you should also avoid heavy blows.

3. Adjust the thermometer, pay attention not to connect the mercury column in the capillary tube with the mercury in the storage tank.

Hello, a digital Beckman thermometer is a fully digital thermometer that can be used to measure ambient temperature, liquid temperature, and gas temperature, etc. For the temperature difference of the digital Beckman thermometer, it is usually used in the case of measuring the temperature difference. When the temperature difference between two objects or liquids needs to be measured, there is an option to set the digital Beckman thermometer to the temperature difference setting.

In front of the temperature difference setting, the thermometer automatically calculates the difference between the two temperatures and displays it on the screen. This makes it easier for the user to take temperature difference measurements without having to manually calculate the temperature difference. It is important to note that when using the temperature difference of a digital Beckman thermometer, the two probe heads of the thermometer should be placed separately in the two objects or liquids to be measured to ensure accurate measurement of the temperature difference.

At the same time, when reading the temperature difference data, it is also necessary to pay attention to avoid misjudging the results due to wrong readings.

A digital Beckman thermometer is a high-precision temperature measuring instrument that is commonly used for precise temperature measurements in laboratory and industrial settings. Digital Beckman thermometers can be measured using different temperature ranges, including normal, low, and differential temperatures. The ambient setting is suitable for measuring objects in the temperature range of -50 to 150, while the low temperature setting is suitable for measuring objects in the lower temperature range.

The temperature difference is suitable for measuring the temperature difference between the surface of an object or a liquid medium. In experiments where temperature differences need to be measured, such as thermal conductivity or heat capacity, a temperature differential is used. In this case, a digital Beckman thermometer measures the temperature at two different locations, calculates the temperature difference between them, and outputs the corresponding measurement.

For this reason, in laboratory and industrial environments, digital Beckman thermometers need to use a temperature difference when it is necessary to measure the temperature difference between the surface of an object or a liquid medium.

The Beckmann thermometer is a precision thermometer that measures the "difference in temperature change", which can only be used to measure the "relative difference", not the absolute value.

Therefore, before use, the thermometer must be soaked in the same solution as the "starting temperature" of the object to be measured, and the height of the mercury must be adjusted to the base point, which is called the "base point temperature".

In the case of a rising Beckman thermometer, this base point is at the bottom; Descending Beckman thermometer, this base point is at the top.

The main difference is the measurement accuracy, which is higher with a Beckman thermometer than a contact mercury thermometer.

1.Mercury thermometer is a type of expansion thermometer, the freezing point of mercury is: -39, and the boiling point is:

It is used to measure temperatures within the range of -39°C to 357°C, and it can only be used as a local supervision instrument. It is not only simple and intuitive to use it to measure temperature, but also avoids errors in external remote thermometers.

2.It was invented by the German chemist Ernst Otto Beckmann, hence the name. The Beckmann thermometer is a thermometer that precisely measures the difference in temperature, and the mercury ball is communicated to the mercury tank by a uniform capillary, in which the mercury is a vacuum in addition to the mercury.

The scale on the scale is generally only 5 or 6, and the minimum scale is which can be estimated.

Construction: The mercury tank is used to regulate the amount of mercury in the mercury ball. With the help of the mercury tank adjustment, it can be used to measure the temperature difference of the medium temperature in the range of 20 +155 by no more than 5 or 6.

The temperature scale behind the mercury tank is only a rough representation of the temperature value, i.e., when the mercury in the mercury tank is connected to the mercury in the mercury ball, the scale on which the mercury surface in the mercury tank is located indicates the rough value of the temperature. Because the amount of mercury in the mercury ball is adjustable, a Beckman thermometer cannot be used to accurately measure the absolute value of temperature. For example, 1° on the scale is not necessarily 1, it may mean and so on.

Scale: There are two scales for Beckman thermometers: one is that the minimum reading is engraved at the upper end of the scale, and the maximum reading is engraved at the lower end, which is used to measure the temperature drop value, which is called a falling Beckman thermometer, and the other is just the opposite, the maximum reading is engraved at the upper end of the scale, and the minimum reading is engraved at the lower end, which is called a rising Beckman thermometer.

There are now more sensitive Beckman thermometers, with a total scale of 1 or 2 and the smallest scale of .