1. Remove the 4 screws that secure the pump head. The screw is located on the back of the metering pump.
2. After the pump head is loose, adjust the stroke length to 0% position before removing the pump head. It is possible to ensure that the electromagnetic shaft has sufficient pressure to keep its connection stable so that the diaphragm can be unscrewed.
3. Pull the hydraulic end outward to disengage the screw from the socket. Grab the liquid end and rotate it counterclockwise. With a little resistance, you can unscrew the diaphragm.
4. Once the diaphragm is removed, inspect the safety diaphragm of the metering pump to ensure it is intact without any damage. Install a new diaphragm and rotate the back plate and diaphragm clockwise until they are tight. Adjust the backing plate so that the leaking drain hole is at the bottom of the pump.
5. Install the pump head after the diaphragm has been installed and the backing fluid drain hole is in the vertical position. Make sure the suction valve is aligned with the leak drain hole and the screw on the hydraulic end is aligned with the corresponding 4 holes.
6. Rotate to the 100% position of the stroke length. This allows the entire set of components to be rotated to the back plate leakage drain hole to align with the bottom end 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 backing plate position, the four bolts are tightened diagonally until appropriate. Apply even force when doing this work.
Move the hydraulic end by loosening the 4 pump head screws. Rotating the stroke length to 0% and grasping the hydraulic end, then sliding out of the screw hole, the screws do not touch them, but also hold the back plate and diaphragm. Then turn the part counterclockwise, with a little resistance, the diaphragm will loosen from the electromagnetic shaft. If the diaphragm is not loose yet, use some lubricant on the contact surface of the diaphragm and the electromagnetic shaft. After a few minutes, gently tap the diaphragm with a plastic hammer. Then proceed again as described above.

When hydrogen peroxide is metered by self-priming, air pockets are generated in the system. how to solve this problem?
The metering pump is installed from the exhaust pump head and uses self-priming aspiration. Keep the aspiration line as short as possible.
Do not measure the liquid after the metering pump is installed and operated?
1. Is the drain pipe installed and the drain valve closed? The drain valve needs to be opened during the introduction of the metering pump. Note: Not all metering pumps have a drain valve.
2. There may be a gas leak at the suction end of the metering pump. The suction side connection on the hydraulic end may be missing the O-ring or the suction valve connection is loose.
3. The metering pump bottom valve may be blocked and the metered liquid cannot pass.
4. The stroke length setting of the metering pump is not suitable.
5. The metered chemical may crystallize at the hydraulic end, causing the check valve ball and valve seat to not work properly.

Flow monitoring is being used to measure a high-viscosity medium, and a flow failure indication signal is received during the liquid introduction process. What can be done to solve this problem?
For reaction time, the pulse duration may not be long enough. The flow monitor pulse width extension can be activated relative to a standard pulse width of 80 msec, increasing the pulse width to 300 msec. Activate the smart transfer switch, remove the cover of the fixed circuit board, and remove the jumper X-1. This activates the extended function and allows more time before the fault indication.

How to prevent the stroke positioning motor from burning out?
When adjusting the stroke position, make sure that the metering pump's motor is always running. If the metering pump motor is not running, the stroke length adjustment rod must resist the tension of the compression spring, which can cause premature failure of the stroke positioning motor.