With the acceleration of urbanization, underground facilities such as gas valve wells, sewage wells, rain wells and other valve wells.(room) is increasing, and its safety issues are also getting more and more attention. The underground utility tunnel is also known“Common groove”It is built underground in the city.,For centralized laying of electricity, communications, radio and television, water supply, drainage, heat, gas and other municipal pipelines of public tunnels. The underground comprehensive pipe gallery can effectively eliminate the phenomenon of "zipper road", so that technicians do not need to repeatedly excavate the road surface, and can carry out emergency repair, maintenance, expansion and transformation of various pipelines in the pipe gallery.;At the same time, the pipeline repair time is greatly reduced. In order to effectively prevent the occurrence of accidents such as explosion, water overflow and facility damage, the safety monitoring system of closed space of valve well (chamber) came into being.

City valve well (room) confined space safety monitoring system is mainly used for all kinds of underground wells indoor combustible gas (natural gas, artificial gas, biogas, etc.) concentration monitoring, environmental temperature monitoring, water level monitoring and manhole cover abnormal monitoring, oxygen content changes. This system uses advanced technical means to achieve the valve well (chamber).24Hour online monitoring and accident warning function. Among them, when workers patrol, repair and explore the underground pipe gallery, the change of the concentration of various gases in the underground pipe gallery may threaten the life safety of relevant personnel. The types of gases in the underground pipe gallery are complex, and oxygen is an indispensable part of human life safety.

The common thing in the underground pipe gallery is hypoxia. The concentration of oxygen is different, and the response of the human body will not be different. The normal oxygen content in the air is within the range20%above, if the oxygen content in the air is18%Below, most people may have symptoms of hypoxia. As the oxygen content in the air slowly decreases, the symptoms of hypoxia will become more and more serious; the oxygen content in the air is15%Left and right, there may be accelerated breathing speed, rapid pulse, significantly increased blood pressure, uncoordinated limbs and other adverse conditions. The oxygen content in the air is13%Around, most people may be physically weak, unable to concentrate, prone to sleep and other symptoms. The oxygen content in the air is lower10%Around, there will be head pain, loss of will consciousness, shock and other symptoms. The oxygen content in the air is5%Below, there may be a gradual cessation of breathing, rapid decline in blood pressure, death and other adverse consequences. When hypoxia occurs, oxygen therapy needs to be given under the guidance of a doctor, which can correct hypoxia, increase arterial oxygen partial pressure, increase the level of oxygen saturation, and accelerate metabolism. When inhaling oxygen, pay attention to the water in the pump to prevent dry airway mucosa and aggravate symptoms such as cough; while the oxygen content is lower5%It can cause people to suffocate. At this time, it is necessary to rely on oxygen detection instruments to ensure the safety of staff's life and property.

Common oxygen detection instruments on the market use electrochemical oxygen sensors, which use the oxidation-reduction reaction of lead and platinum. Most of these oxygen sensors have a two-year life span, which is not very high. For an underground pipe gallery environment that needs to be detected for a long time, the replacement period is relatively short, and a sensor that will move towards lead and platinum materials will definitely withdraw from the market in the future, at this time by the Shenzhen technology agent of the UKAlphasenseLead-free long-life oxygen sensorLFO2-A4It has the characteristics of long life, high precision, long-term stability, and good linearity. The four-year life guarantee can greatly reduce the replacement cycle and provide customers with a safe and reliable environment. Specific parameters are as follows:

Oxygen sensor measuring range (%): 0-30

Working life: more than 4 years

Size (mm) : 20.3 x 16.5mm

Output: 9-115 uA @ 20.9% O2

Response time t90 (seconds):

Linearity (ppm):In10%O2the error

Weight: