The electromagnetic flowmeter is the same as the usual measuring instruments. Before the electromagnetic flowmeter is put into operation after installation and wiring, it is necessary to check whether the following installation and wiring are correct and whether the instrument can work normally. Before the electromagnetic flowmeter is put into operation, the sensor must be filled with the actual measuring medium, and after the power is turned on, the zero point is adjusted in a static state.
After the electromagnetic flowmeter is put into operation, check the zero point according to the medium and the conditions of use. Regularly check the zero point for the easy-to-precipitate, easily polluted electrodes, solid-containing non-clean media, etc. In the initial stage of operation, check more to obtain experience and determine the normal inspection cycle. .
Electromagnetic flowmeters For conditional users, several basic parameters of the sensor should be measured and recorded before the electromagnetic flowmeter is put into operation:
1 Insulation resistance of the electrode (in case of sensor empty tube, insulation resistance of the two resistors to the instrument case or ground);
2 Insulation resistance of the excitation coil (insulation resistance of the excitation coil to the instrument housing or ground);
3 The cold resistance value of the excitation coil (that is, the copper resistance value of the enameled wire of the excitation coil);
4-electrode contact resistance
The sensor is filled with liquid. Measure the resistance between the electrode and the ground. The contact resistance of the two electrodes should be approximately the same. These data are helpful in analyzing the cause of the failure of the electromagnetic flowmeter after a period of operation. For example, when the contact resistance of two electrodes changes, it indicates that the electrode is likely to be contaminated;
The contact resistance becomes larger, the contaminants may be insulating deposits; the contact resistance becomes smaller, the contaminants may be conductive deposits; the contact resistance of the two electrodes is asymmetric, indicating that the two electrodes are not contaminated to varying degrees The drop in the insulation resistance of the electrode and the excitation coil indicates the degree of moisture in the sensor; when the insulation resistance drops to a certain degree, it will affect the normal operation of the electromagnetic flowmeter. The cold resistance value of the excitation coil is a parameter that guarantees the normality of the excitation coil.
Electromagnetic Flowmeter
PVC Edge Banding For Office
The main function of the edge banding is to seal the cross-section of the board, so as to avoid the damage of the board and the adverse factors (mainly moisture) in the process of use and prevent the formaldehyde inside the board from volatilizing, and at the same time achieve the effect of beautiful decoration.
The product has the following main features: smooth surface, no blistering, no ribbing, moderate gloss, smooth surface and back surface, uniform thickness, uniform width, reasonable hardness, high elasticity, good quality, strong wear resistance, trimmed and sealed The color of the side and the side is close to the surface color, not whitish, good gloss, and the overall color of the finished furniture is coordinated.
The role of edge banding:
First, the edge banding has the function of blocking harmful gases such as formaldehyde
Good edge banding or multi-sided edge banding can reduce the amount of formaldehyde emission per unit time (ie, slow down the emission rate). It is worth noting that edge banding will not reduce the formaldehyde content of the board, but this has the advantage of edge banding. It can reduce the formaldehyde emission per unit time of unenvironmentally-friendly sheets to a level that is acceptable to humans and does not affect health.
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Good edge banding has the effect of beautifying office furniture, but if it is to be beautiful, the requirements for edge banding will be higher. Not only must the edge banding and the end surface of the board be firmly and smoothly combined, but also that the edge banding must be combined with other The joints of the surfaces should not have defects such as bottoming, chipping, and large gaps, and the transition should be natural, smooth and smooth.
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The precise edge sealing design of the board can prevent water or other liquids from entering the board, avoiding the expansion, deformation and breeding of bacteria on the desktop, thereby prolonging the service life of the office furniture, and the office furniture after the edge sealing treatment is also more expensive in terms of cleaning easy.
Fourth, avoid sharp edges and corners from hurting people's bodies
The general edge banding will use the dull edge banding design to smooth the corners of the table, thereby reducing the damage to the body by the sharp corners
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