These test kits are new to the market and rely on the detection of viral proteins in swab samples They consist of monoclonal antibodies specific for the viral antigens and results are seen by the naked eye by way of chromatographic particles. There have only been a few of these tests commercialized and normally require a high viral count to work effectively. In the first few months of the pandemic some national health authorities questioned the reliability of these tests, as they usually require a higher viral count that qPCR to show positive. Therefore, false-negatives can occur. antigen test kit, rapid antigen test kit, covid-19 antigen test, antigen detection, antigen kit Shenzhen Uni-medica Technology Co.,Ltd , https://www.unimed-global.com
Reasons for the water pump not to discharge water and how to eliminate it:
1. Insufficient flow after start-up: the speed is not matched or the belt is slipping, so the rotation speed is low; the installation angle of the axial flow pump blade is too small; the lift is insufficient; the suction stroke is high; the bottom valve, the pipeline and the impeller are partially blocked or the impeller is defective; The water pipe leaks severely. Exclude: restore the rated speed, remove the belt grease, adjust the belt tightness; adjust the blade angle, reduce the pump installation position; seal the pump leak, press the packing; remove the blockage, replace the impeller; replace the leak ring, block the leak Where.
2, the pump fever bearing damage: the dynamic bearing or the bracket cover clearance is too small; the pump shaft is bent or the two shafts are not concentric; the tape is too tight; the oil is not good or the oil quality is not good; the balance hole on the impeller is blocked, the impeller is out of balance, increase Big thrust to one side. Exclude: replace the bearing; remove the rear cover, install a gasket between the bracket and the bearing housing; adjust the pump shaft or adjust the concentricity of the two shafts; properly adjust the tightness of the tape; add clean butter, butter accounts for the bearing 60% of the free space; remove the blockage in the balance hole.
3. The pump does not turn when starting: the packing is too tight or the impeller and the pump body are stuck by the debris, or the pump shaft, the bearing, the leak-reducing ring rust, or the pump shaft is severely bent. Exclude: loosen the packing, dredge the water trough; disassemble the pump body to remove debris and rust; remove the pump shaft to correct or replace the new pump shaft.
4. There is no water after starting: there is air or water in the pump, or the bottom valve is not tightly filled with water, or the vacuum pump packing is severely leaking, and the gate valve or the door is not tightly closed. Exclude: remove debris, replace the damaged rubber pad, change the direction of the valve; press or replace the new filler, close the gate valve or flap the door; increase the amount of irrigation until the venting plug does not bubble; replace Cracked pipe; lower the lift and press the nozzle of the pump into the water 0.5 m.
Analyze the reason why the pump does not produce water and how to eliminate it
[Foreword] There are many reasons why the pump does not produce water, and the method of elimination is not the same. In general, the leakage between the shafts of the bushings, the seal end caps and the pump body is easier to find and solve, but it needs to be carefully observed, especially when the working medium is liquefied gas or high pressure, toxic and harmful gas, it is relatively difficult. some.