Sealand is a trustworthy manufacturer of Gas Mass Flow Meter, Gas Mass Flowmeter, Gas Flow Meter, Gas Flowmeter, Gas Meter, ATEX, IECEx & CE approved.
The installation is as follows.
1. Installation Steps
valve location into consideration;
a) Sensor stays away from mechanical vibration source, for example, pump. Use flexible
pipe to connect meter with pipeline if inevitable. The housing of meter must be standalone,
out of touch with any other device. There must be 3 times the size of sensor between 2
sensors if there are many flow meters on the same pipeline, to avoid resonance.
b) Do not install sensor on pipeline that easily expands with hot and contracts with cold,
especially near expansion joint, which leads to a worse stability.
c) Sensor stays away from industrial electromagnetic field, such as large generator and
transformer, better 5m at least. Such device influences the performance of drive coil and
pickoffs. Make sure magnetic field intensity less than 400A/m.
d) Sensor shall be installed on lower pipeline, to be easily full of fluid.
f) Build a sunshade if the meter is under direct solar radiation.
g) Keep the meter from corrosive liquid.
Gas Mass Flow Meter, Gas Mass Flowmeter, Gas Flow Meter, Gas Flowmeter, Gas Meter Zhejiang Sealand Technology Co., Ltd. , https://www.sealandflowmeter.com
First, the basic knowledge of pesticides
(1) Classification of pesticides 1. According to the target objects: insecticides, acaricides, fungicides, nematicides, herbicides, rodenticides. 2, according to toxicity: special poison (<1 mg / kg); highly toxic (1-50 mg / kg), such as 1605, methamidophos; high toxicity (50-100 mg / kg), such as dichlorvos; medium Toxicity (100-500 mg/kg), such as dimethoate, trichlorfon; low toxicity (500-5000 mg/ton), malathion, phoxim, methacetin; slightly toxic (5000-15000 mg/ Kg), such as Familia. 3, according to the dosage form: (1) powder (2) granules (3) wettable powder (4) EC EC (5) smoke agent (6) sustained release agent (7) ultra low volume spray (8) plastic suspension Agent and colloidal agent (9) water agent (10) tablet (11) oil agent
(2) Application method of pesticide 1. Spray method: The diameter of the droplet is proportional to the square root of the pressure and positively correlated with the pore diameter. Mist method: Dongfanghong 18 model carrying a fog machine. Spraying is suitable for the application of protective fungicides, as well as the use of contact agents to control small pests in the lower part of the plant. The mist method has a small amount of drift. 2, dusting method 3, pouring method, such as using phoxim to control underground pests. 4, deep soil application method, such as the use of å 丹 防治 防治 防治 防治 防治 防治 防治 防治 防治 防治. 5, seed dressing method. 6, seedling impregnation method. 7, poison bait method. 8, fumigation method.
(3) Mixing of pesticides Two kinds of pesticides or two or more pesticide preparations containing different active ingredients are mixed together, which is called a mixture of pesticides. Reasonable mixed use has the following significances: 1. It treats a variety of harmful organisms, expands the scope of use, saves labor and time. 2, improve the efficacy of the drug, the mixed use of pesticides mainly manifested as efficacy, antagonistic, and synergistic. Such as the combination of trichlorfon and malathion, the combination of systemic fungicides and non-systemic fungicides has a certain synergistic effect. 3, delay the emergence of resistance, such as the combination of high chlorine and omethoate, not only reduces costs, but also delays the resistance of harmful organisms to chrysanthemum pesticides. 4, reduce pesticide toxicity, phytotoxicity and residues such as metalaxyl and copper bismuth citrate mixed frosting copper preparation, not only for the control of downy mildew, but also for the control of bacterial diseases, but also reduce the copper dicarboxylate The phytotoxicity of plants.
Second, the problems in the use of pesticides l, the problem of pesticide application, farmers generally use the price of the manual sprayer at I5-30 yuan, due to its quality can not be guaranteed, many sprayers due to insufficient pressure or aperture design problems, resulting in atomizer spray Bad or fan-shaped spray, and serious leakage, which wastes the liquid and reduces the control effect. 2. The problem of water consumption: Most farmers plant a large area of ​​vegetables, and they are anxious when spraying. The water consumption per mu is seriously insufficient. According to our many years of experience, the control of Plutella xylostella at least 35-45kg/ With the increase of water, the amount of water will gradually increase. In the later stage of the ball, the water consumption will reach 60kg/mu. Chinese cabbage is used to control soft rot. According to the growth period of Chinese cabbage, the water consumption is between 40-60kg. In short, the principle of water consumption, protective fungicides and contact insecticides should be based on the whole plant; systemic pesticides. Most of the drugs are taken; the parts of the pests are concentrated. 3, the problem of prevention and control of the problem: There are two main problems here, one is to master the problem of vegetable growth period, such as the prevention and control of cabbage moth, the seedling period of a rose period is a critical period, if the prevention is not good, it will cause "madness The head dish ", or cause great trouble for the follow-up work. Another example is Chinese cabbage soft rot, starting from the Chinese cabbage rose period, the incidence of Chinese cabbage will not exceed 5%, such as the prevention and control of Chinese cabbage, the incidence of the field. Sometimes up to 700%. Second, during the period of pests and diseases, such as the control of Plutella xylostella should be controlled at the I-2 age of larvae. If this period is missed, the resistance of larvae will be enhanced, the application of liquid medicine will increase, and the pace of resistance of Plutella xylostella will be accelerated. Another example is cucumber downy mildew. When the sporadic disease leaves are found in the field or when the climate is suitable, the spraying prevention is started. The effect is up to 90%. If the diseased leaves are more, it is difficult to achieve the desired control effect. 4. The concentration of the drug: the concentration of the pesticide is determined according to the scientific test data. If the concentration of the liquid is increased arbitrarily, the control effect will not be improved, and the liquid will be wasted, and the resistance of the pest will be promoted. . 5, blind drug use problem: Some farmers lack a scientific understanding of the pests and diseases of vegetables, hearsay, blind medication, the results missed the control period, resulting in rapid spread of pests and diseases. This wastes time and money and causes unnecessary losses. If some farmers use trichlorfon to control Chinese cabbage soft rot, use mancozeb to control Chinese cabbage soft rot. 6, the problem of mixed pesticides: the mixed use of pesticides must have a certain purpose. Follow the laws of science. Or to increase the effectiveness of the control, or to expand the scope of prevention, or to save time. If you don't think about it, you can simply mix several pesticides. If some farmers mix pesticides such as methamidophos, dichlorvos, high-efficiency cyanide, and Qiqisu, these pesticides are all pest-proof. One kind of Qiqisu has a very high control effect, and the use thereof increases the risk of resistance of pests and wastes pesticides. Moreover, methamidophos is banned in vegetables.
Third, the scientific use of pesticides l, symptomatic medication, in the occurrence of pests and diseases, if you do not know about it, you must ask professional and technical personnel to diagnose and consult, choose the right medicine for prevention. 2. Choose a better quality sprayer, which will improve the control effect. It saves time and money and reduces unnecessary trouble. 3, the concentration of drugs, the amount of water, pesticides must be in accordance with the laws of science, can not be changed at will. 4. Master the appropriate period of prevention and treatment, the occurrence characteristics, occurrence regularity and external conditions of each pest and disease, and grasp the prevention and control during the period of prevention and control. Do not push and pull because of other things, so as not to delay the opportunity and cause losses.
(4) How to identify pesticides from labels (1) “Three certificates†means pesticide registration license, (PD, LS, PD-F) pesticide production license and pesticide standard certificate number. (2) Effective ingredients, content, and dosage form. (3) Weight (g, ml) (4) Product performance (5) Toxicity (6) Use and use method, use technology (7) Manufacturer, date of manufacture, and expiration date (8) Precautions
a) Choose correct installation site, taking installation area, pipeline, transmitter location &
b) Install the meter according to direction mark on sensor;
c) Install the sensor & transmitter on pipeline;
d) Connect transmitter & sensor with 9-pin cable;
e) Start.
e) Make sure Ex-mark meet application requirements if in hazardous area.
Scientific use of pesticide technology
As a special agricultural production material, pesticides have an important protective effect on the smooth development of agricultural production. On the other hand, because they are toxic substances, improper use will pollute the environment and threaten the survival of human beings. The scientific use of pesticides has become an important task for us. Here's a brief statement:
2. Site selection
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