I. System Overview:
Phosphine is a colorless, highly toxic, and flammable gas that is heavier than air and has a smell similar to that of fish. Toxic effects on humans: When the concentration in the air is 2 ～ 4mg / m3, its odor can be smelled; if the concentration is above 9.7mg / m3, it can cause poisoning; 550 ～ 830mg / m3 contact 0.5 ～ 1.0
Death occurred within 1 hour, and 2798mg / m3 could cause death quickly. The oral LD100 of PH3 is about 40 mg / kg. Phosphine inhaled from the respiratory tract first stimulates the respiratory tract, causing mucosal congestion and edema, and alveoli also have congestion and exudation. In severe cases, there is a bit of extensive hemorrhage. Phosphine is absorbed by the alveoli and reaches the whole body, affecting the central nervous system, heart, liver, kidney and other organs. Mistakes of oral phosphide, in the stomach when the acid meets the acid releases phosphine, and absorbs into the blood from the gastrointestinal tract, similar to the poisoning caused by inhaled phosphine from the respiratory tract.
However, phosphine is widely used in pest control and killing of grain depots and tobacco depots. Due to the highly toxic nature of phosphine, national standards require that residue testing be performed after the use of phosphine in grain depots and tobacco warehouses. It is for this reason that Anpar has developed a phosphine residual phosphine detection alarm system. The system consists of a gas detection and detection unit, a signal transmission and acquisition unit, a display unit (centrally displayed on the alarm control host), a monitor, a control unit, an alarm unit, and a controlled equipment unit (such as a fan and a solenoid valve).
2. System installation diagram: