Plastic Flowmeter is a widely used instrument in water treatment engineering, mainly used for flow detection, usually installed after the water pump, to control the water intake of each structure, currently the most widely used are electromagnetic flowmeter and ultrasonic flowmeter.
In the selection of the flowmeter, the first thing to consider is the corrosiveness of the measured medium to the flow-passing parts, so as to avoid affecting the service life of the flowmeter due to the corrosion of the medium;
During the design and installation process of the flowmeter, the length of the straight pipes before and after the flowmeter needs to be considered. Usually, the principle of 5D before and 3D after the flowmeter is followed. Here, D is the inner diameter of the pipe. If the length is insufficient, the measurement accuracy will be affected. When using an ultrasonic flowmeter, the distance between the first 10D and the rear 5D must be met, and the distance from the flowmeter to the water pump must be more than 30D.
When selecting the type, the flow rate of the medium in the pipeline needs to be between the maximum value and the minimum value of the selected flowmeter, and avoid approaching the maximum or minimum value, so as to avoid affecting the measurement accuracy.
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At present, the pre-emergence germination equipment on the market includes a wall heat-insulation type germination room and a heat-insulated cover-type soft shed, and the seed-discharging capacity can reach several thousand liters or 10,000 liters or more, which can be used by large-scale seedling bases. There is a computer-controlled temperature, humidity, light, ventilation and floor-standing artificial climate chamber for germination, nursery, tissue culture, and cycle cultivation. The working volume is 200}400L, which is suitable for laboratory use. There are also 1}20L benchtop small germination machines and less than 1L germination boxes, which can be used by professional vegetable house seedlings and seed business units to detect the germination rate. The unit volume is 0.1*0.2k stay L. The accuracy of temperature control is expressed in terms of temperature deviation and its degree of fluctuation. The precision of the digital temperature controller is high, the deviation and the fluctuation of the temperature controller are approximately 0.590, and the accuracy of the simulation is low, generally it is 1.59Co.
Because of the low humidity, the seeds are not easy to germinate, and the humidity is high, so it is easy to rot. Therefore, the high-grade climate box is equipped with a humidity control device, and its relative humidity can be maintained at 50%}90%, and some can reach 95%. The simple germination equipment does not have a dedicated humidity control device, and its humidity is usually taken to ensure the following two measures: First, the use of electric heat pipe to directly boil water to generate steam heated germination chamber, its relative humidity with a small change in temperature, generally can be maintained at 80 %}95%; The second is heating the air with a hot wire (plate), the humidity of which is ensured by moisturizing plate or intermittent watering, generally can be controlled between 60%} 90%. If water is not added in time, it will affect the germination.
The temperature is uniform and germination is neat. The temperature unevenness of the seed germination box is less than 1}C, the temperature non-uniformity of the light box is less than 1.590, and the temperature unevenness of the large and medium-sized germination chamber is less than 29C. Since most of the seeds germinate without lighting, the general pregerminator is not equipped with lighting equipment, and there are a few medium and low-light devices, while the seed germination box and the light box have perfect lighting equipment of 3000-30000Lx. The temperature and light unevenness can be solved by adjusting the disk.
Selection of seed germination equipment seed germination box
Seed germination technology can increase the germination potential and germination rate of seeds. In the past, the drawbacks of traditional germination methods are difficult to control the conditions for ease, uneven germination, very low rate of seedling formation, and easy to cause rotten seed rotten species, so in modern times In the germination technology, the choice of equipment is very important. The main equipment of the germination technology is the seed germination box. How to choose?