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Metering pump has a problem how to deal with

How do I replace the diaphragm of the metering pump?
1. Remove the four screws that secure the pump head. The screw position is on the back of the metering pump.
2. After the pump head is loose, adjust the stroke length to 0% before removing the pump head. Can ensure that the electromagnetic axis has enough pressure to maintain its connection is stable, so you can unscrew the diaphragm.
3. Pull the hydraulic end away from the socket. Grasp the liquid side to rotate counterclockwise. A little resistance, you can spin off the diaphragm.
4. Once the diaphragm is removed, check the metering pump's safety diaphragm to make sure it is intact and without any damage. Install the new diaphragm, turn the backplate and diaphragm clockwise until it is tight. Adjust the backplane so that the drain drain hole is at the bottom of the pump.
5. Install the pump head after the diaphragm has been installed and the backsheet drain drain is placed in the vertical position. Make sure that the suction valve is aligned with the drain drain hole and that the screw at the hydraulic end aligns with the corresponding four holes.
6. Rotate to 100% of the stroke length. This allows the entire set of components to rotate to the backsheet drain drain holes aligned with the bottom of the pump. Adjust the hydraulic end and diaphragm to the proper position during pump operation.
7. When the hydraulic end is adjusted with the backplane position, the four bolts are diagonally tightened until they are suitable. The work should be done evenly.
Remove the hydraulic head by loosening the four pump head screws. Rotate the stroke length to 0% and grab the hydraulic end and slide it out of the screw hole, so the screws do not touch them, but also hold the backplane and diaphragm. And then counterclockwise rotation of this part, a little resistance, the diaphragm will be loose from the electromagnetic axis down. If the diaphragm is not loosened, use some oil on the contact surface of the diaphragm and the electromagnetic shaft. Place a few minutes later, with a plastic hammer gently tapping the diaphragm. And then proceed again as described above.
When the self-absorption method used to measure hydrogen peroxide, the system produces cavitation. how to solve this problem?
Dosing pump installed from the exhaust pump head, using self-irrigation liquid. Keep the aspiration line as short as possible.
Metering pump installed, running after the measurement of liquid?
1. Is the drain pipe installed and the drain valve closed? The drain valve needs to be opened during metering pump priming. Note: Not all metering pumps have drain valves.
2. There may be a gas leak at the suction end of the metering pump. The hydraulic end suction side connector may be missing the O-ring or the suction valve connection is loose.
3. Metering pump bottom valve may be blocked, the measurement of liquid can not pass.
4. The stroke length of the metering pump is not suitable.
5. Metered chemicals may crystallize at the hydraulic end, resulting in non-directional valve ball and valve seat not working properly.
I am using flow monitoring to measure a high-viscosity medium that receives a flow failure indication signal during the priming process. What can I do to solve this problem?
The duration of the pulse may not be long enough for the reaction time. With respect to the standard pulse width of 80msec, the flow monitor pulse width extension can be activated to increase the pulse width to 300msec. Activate the smart switch, remove the cover of the fixed circuit board, remove the jumper X-1. This activates the extended function, allowing more time before the fault indication.
How to prevent stroke positioning motor burned?
When adjusting the stroke position, make sure that the motor of the metering pump is always running. If the metering pump motor is not running, the stroke length adjustment lever is resistant to the tension of the compression spring, which can cause premature damage to the stroke positioning motor.