Chemical device for balancing air pressure

The pressure proportional mixing device is used to store the foam extinguishing agent, which is replaced by the water supply of the pump group through the pressure foam proportional mixer and mixed with the water supply in a certain proportion to form a foam mixed solution.

Pallet balance is an instrument used to roughly weigh the mass of substances, and each balance is equipped with a box of weights. There are two kinds of loads commonly used in middle school laboratories: 100 g (sensitivity is 0. 1 g) and 200 g (sensitivity is 0.2g).

Load, also called loading capacity, refers to the maximum weight that can be weighed. Sensitivity refers to the balance error (+/-). For example, a pallet balance has a sensitivity of 0. 1 g, which means that the error is 0. 1 g, so it cannot be used to weigh items with a mass less than 0.1g..

Precautions for use:

(1) Before weighing, place the balance smoothly, move the traveling code to the zero point of the balance, and check whether the balance swings. If the balance has been reached, the number of squares on the left and right sides of the ruler indicated by the pointer swing is nearly equal. When the pointer is at rest, it should point to the center of the ruler. If the balance swings unevenly, you can adjust the left and right balance nuts to balance the swing.

(2) The weighed object cannot be directly placed on the tray, but a piece of paper with the same size should be placed on two trays respectively, and then the reagent to be weighed should be weighed on the paper. Wet or corrosive reagents must be weighed in a glass container (such as a mirror, beaker or weighing bottle).