According to the requirements of the test task, the laboratory decoration includes precious precision instruments and various chemicals, including flammable and corrosive drugs. In addition, harmful gases or vapors often occur in operation. Therefore, there are special requirements for the structure, environment and indoor facilities of laboratories, which should be considered in the preparation of new laboratories or in the reconstruction of existing laboratories.
Laboratory rooms are roughly divided into three categories: precision instrument laboratory, chemical analysis laboratory, auxiliary room (office, storage room, cylinder room, etc.).
Laboratories should be kept away from the environment of dust, smoke, noise and sensation sources. Therefore, laboratories should not be built near the main road, boiler room, machine room and production workshop (outside the workshop laboratory). In order to maintain good weather conditions, the general direction should be north-south.
1. Planning of Precision Instrument Laboratory
Precision instrument room is required to have the functions of fire prevention, shock prevention, electromagnetic disturbance prevention, noise prevention, moisture proof, corrosion prevention, dust prevention and harmful gas invasion prevention. Room temperature should be kept as constant as possible. In order to maintain the good performance of general instruments, the temperature should be 15 - 30 C, and the best control is 18 - 25 C if conditions permit. The humidity is between 60% and 70%. A instrument room with constant temperature can be equipped with double doors and windows and air conditioning devices.
Instrument room can use terrazzo floor or anti-static floor, carpet is not recommended, because carpet is easy to accumulate dust, static electricity will also occur. The supply voltage of Bosch Large Precision Instrument Room should be stable, and the fluctuation of voltage is generally allowed to be (+10%). If necessary, it should be equipped with ancillary equipment (such as regulated power supply, etc.). In order to ensure uninterrupted power supply, dual power supply can be used. Special ground wires should be planned with a grounding electrode resistance less than 4_.
Gas chromatographic chamber and atomic absorption analysis chamber should be located near the outdoor location where the cylinder chamber can be built (in the North direction) because of the use of high-pressure cylinders. The distance between the test bench and the wall is 500 mm for easy operation and repair. Good ventilation should be provided in the room. A local exhaust hood is arranged above the atomic absorption instrument.
Microcomputers and precision instruments controlled by microcomputers have certain requirements for supply voltage and frequency. Uninterruptible power supply (UPS) can be selected according to demand in order to avoid voltage transient, instantaneous power outage and insufficient voltage affecting instrument operation.
At the same time of planning the special instrument analysis room, the corresponding chemical treatment room should be planned in close proximity. It is necessary to protect instruments and strengthen management.
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