Temperature and humidity is the most basic environmental factors, in these years, the requirements for temperature and humidity in various places are also increasing, and taking into account the weather conditions will make temperature and humidity in different places are not up to standard, which has great harm to people's life and production. The requirements for temperature and humidity in the laboratory are more strict, and the requirements for temperature and humidity are different in different experimental processes, so the laboratory needs to use equipment such as constant temperature and humidity machine to control temperature and humidity, and create appropriate temperature and humidity for the laboratory.

First, the balance between the situation

The room area is 20 square meters and the height of the room is 3 meters

2. Design requirements

Indoor to achieve constant temperature and humidity, temperature control 22±2℃, humidity control 50-60%RH.

3. Technical solutions

Balance to do constant temperature and humidity treatment, on the one hand is to protect high-precision instruments, prevent metal rust, circuit short circuit and line aging; On the other hand, it is to ensure that the indoor instrument will not be affected by the external environment when measuring.

The national Pharmacopoeia has relevant provisions, the balance as a very high precision instrument, in the measurement must ensure that the indoor temperature and humidity constant. Temperature and humidity have a considerable impact on the results of the balance measurement, especially when measuring some substances with a certain moisture content or hygroscopicity.

High temperature will speed up the evaporation of water in the measured items, resulting in low measurement results; If the temperature is too low, the water vapor in the air will condense on the wall of the glass or metal product containing the measurement item, causing the result to be biased; If the indoor humidity is too high, the measured substance may absorb moisture in the air, resulting in a high measurement result. If the indoor humidity is too low, the moisture in the measured substance will evaporate into the room with low humidity under the action of steam pressure difference, resulting in low measurement results.

To achieve constant temperature and humidity in the balance room, a constant temperature and humidity machine must be used to control the temperature and humidity.

At present, the area between the balance is relatively small, if the constant temperature and humidity machine is directly placed indoors, it can be used as a ceiling unit, the constant temperature and humidity machine is directly installed in the ceiling, the air duct is used to supply air, the area between the balance is relatively small, only need to open a return air outlet, two air supply outlets.

The schematic diagram of the air duct is as follows:

In order to achieve the ideal effect between the scales, there are the following points to note:

First, the insulation of the room should be done well, and the walls and ceiling should be insulated

Two: the room's extra Windows, holes, vents, gaps must be sealed

Three: In order to prevent the impact of personnel entering and leaving the indoor temperature and humidity, it is recommended to make a buffer room

Four: The design of the air duct must be reasonable, the uniform air supply of the diffuser can not have a dead Angle, and the air flow should be smooth

Five: The return air outlet and supply air outlet of the constant temperature and humidity unit can not be blocked, so as not to affect the indoor air flow.