Analyze the installation method and characteristics of the new ammonia detector
The ammonia detection and alarm integrated machine is suitable for continuous on-line detection of ammonia concentration and on-site sound and light alarm in various industrial environments and special environments, and plays an early warning role on the safety of dangerous scenes. The instrument adopts imported electrochemical sensors and microcontrollers. Technology, with signal stability, high precision, good repeatability, etc., explosion-proof wiring is suitable for a variety of hazardous locations. The instrument is compatible with various control alarms, PLC, DCS and other control systems, and can realize on-site alarm and remote monitoring and alarm functions at the same time. The sensitive component of the instrument is a four-electrode electrochemical cell. It includes a working electrode and an auxiliary electrode. The auxiliary electrode is used for temperature compensation to improve the selectivity of the electrode system. The sensor response signal is linear with the ammonia concentration in the air.
Characteristics
1. Weighted average (TWA). Compact structure and light weight;
2. Long life. Low voltage status display. High reliability;
3, high reproducibility, good stability;
4, the body is small, can be inserted in the helmet, tied to the belt or placed in the pocket, completely release the hands;
5, strong rubber sheath, excellent anti-drop, impact resistance, through the 6-foot drop test;
6. Strict design, excellent protection level, waterproof and dustproof to IP67, more suitable for use in harsh environments;
7, one-button operation, simple and convenient, labor-saving and worry-free;
8, long-lasting and durable lithium battery, the typical design value of more than 9000 hours, that is, 24 hours a day, the use can be more than one year;
9, the standard configuration of infrared communication functions, intelligent software makes daily work from cumbersome and simple.
Related detector
1. Pumping ammonia detector
The pumping ammonia detector uses a built-in getter pump to quickly detect ammonia concentrations in the working environment. The pumping ammonia detector adopts imported electrochemical sensor, which has a very clear large liquid crystal display and sound and light alarm prompts. It can also detect dangerous gases in a very unfavorable working environment and prompt the operator to prevent it.
2, portable ammonia detector
The portable ammonia leak detector continuously detects the ammonia concentration in the working environment. The ammonia gas detector detects the gas concentration by natural diffusion method, adopts imported electrochemical sensor, has excellent sensitivity and excellent repeatability; the ammonia gas detector adopts embedded micro-control technology, the menu operation is simple, the function is complete, and the reliability is high. The performance of the whole machine is at the leading level in China. The detector shell is made of high-strength engineering materials and composite elastic rubber material, which has high strength and good hand feeling.
3, online ammonia detection alarm
The online ammonia detection alarm is composed of a gas detection alarm controller and a fixed ammonia detector. The gas detection alarm controller can be placed in the duty room to monitor and control each monitoring point. The ammonia detector is installed in the gas most easily. The core part of the leak is the gas sensor. The ammonia detector converts the ammonia concentration detected by the sensor into an electrical signal and transmits it to the gas detection alarm controller through the cable. The higher the gas concentration, the stronger the electrical signal, when the gas concentration reaches or exceeds the alarm set by the alarm controller. When the point is reached, the gas detection alarm controller sends out an alarm signal, and can activate an external device such as a solenoid valve or an exhaust fan to automatically eliminate hidden dangers. The online ammonia detection alarm is widely used in petroleum, chemical, metallurgy, electric power, coal mines, water plants and other environments to effectively prevent the occurrence of explosion accidents.
installation method
The ammonia gas alarm is composed of a detector and an alarm control host. It is widely used in the petrochemical industry where there are toxic gases such as petroleum, gas, chemical, oil depots, etc., to detect the leakage of indoor and outdoor dangerous places, and to ensure production and personal safety. Important instrument. When there is a toxic gas in the tested place, the detector converts the gas signal into a voltage signal or a current signal and transmits it to the alarm meter. The instrument displays the percentage concentration value of the lower limit of the toxic gas explosion. When the concentration of toxic gas exceeds the alarm set value, an audible and visual alarm signal will be generated, and the on-duty personnel will take safety measures in time to avoid the explosion accident.
1. Precautions when applying
Once the fixed installation of the ammonia gas alarm is in place, its position is not easy to change. The following points should be considered for specific applications.
(1) Identify the possible leak points of the devices to be monitored, analyze their leakage pressure, direction and other factors, and draw the probe position distribution map, according to the severity of the leakage into three levels I, II, III.
(2) According to the specific factors such as airflow direction and wind direction of the site, determine the leakage direction of toxic gas when a large amount of leakage occurs.
(3) According to the density of the leaking gas (greater or smaller than the air), combined with the trend of air flow, integrated into a three-dimensional flow trend diagram of leakage, and an initial set point scheme is made at the downstream position of the flow.
(4) Study whether the leakage state of the leak point is micro-leak or spray. If it is a micro leak, set the position of the point close to the leak point. If it is a jet leak, it should be slightly away from the leak. Based on these conditions, a final set-up plan is drawn up. In this way, the quantity and variety that need to be purchased can be estimated.
(5) For places where there is a large toxic gas leakage, according to the relevant regulations, a detection point should be set for each distance of 10-20m. For small, non-continuously operating pump rooms that are unattended, attention should be paid to the possibility of toxic gas leakage. Generally, a detector should be installed at the downwind.
(6) For places with hydrogen leaks, install the detector on the plane above the leak point.
(7) For media with a gas density greater than air, the detector should be mounted on a lower surface below the leak point and pay attention to the surrounding environment. Special attention should be paid to the setting of safety monitoring points for places where toxic gases are easily accumulated.
(8) For open toxic gas diffusion and escape environment, if there is no good ventilation condition, it is easy to make the toxic gas content in a certain part of the air close to or reach the lower explosion limit concentration. These are safety monitoring points that cannot be ignored. . According to the analysis of on-site accidents, more than half of them were caused by incorrect installation and calibration. Therefore, it is necessary to introduce the correct installation and calibration considerations to reduce the failure.
2. Precautions for installation of ammonia gas alarm
(1) The alarm probe is mainly a detecting component that contacts the combustion gas sensor. The platinum wire coil is coated with alumina and a binder to form a spherical shape, and the outer surface thereof is provided with a rare metal such as platinum or palladium. Therefore, be careful when installing to avoid breaking the probe.
(2) The installation height of the alarm should generally be 160-4250px, so that maintenance personnel can carry out routine maintenance.
(3) The alarm device is a safety instrument with sound and light display function. It should be installed in a place that is easy for the staff to see and hear, so as to eliminate hidden dangers in time.
(4) There must be no strong electromagnetic fields (such as high-power motors and transformers) that affect the operation of the instrument.
(5) The density of the gas to be measured is different, and the installation position of the indoor probe should also be different. When the measured gas density is less than the air density, the probe should be installed 750px away from the roof, and the direction should be downward; otherwise, the probe should be installed at 750px from the ground, and the direction is upward.
Installation location
The ammonia detector should be installed in a gas leaking place, and the specific position should be determined according to the specific gravity of the gas to be tested relative to the air.
When the specific gravity of the detected gas is greater than the specific gravity of the air, the detector should be installed at a distance of 30 to 60 cm from the ground and the sensor portion is downward.
When the specific gravity of the detected gas is less than the specific gravity of the air, the detector should be installed at a distance of 30 to 60 cm from the ceiling and the sensor portion is downward.
In order to use the detector correctly and prevent the detector from malfunctioning, please do not install it in the following locations:
a place directly affected by steam or soot;
a place where the air flow, ventilation fan, door, etc. flow is large;
Where there are many water vapor and water droplets (relative humidity: ≥90% RH);
The temperature is below -40 ° C or above 55 ° C;
A place with strong electromagnetic fields.
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