1) Abnormal liquid suction of metering pump

Rotate to 100% of the stroke length. In this way, the whole set of components can be rotated to align the drain hole of the back plate with the bottom of the pump. Adjust the hydraulic end and diaphragm to the proper position during the operation of the pump.

The pulse duration may not be long enough for the reaction time. Compared with the standard pulse width of 80msec, the pulse width extension of the flow monitor can be activated (official account: pump housekeeper), and the pulse width can be increased to 300msec. Activate the intelligent transfer switch, remove the cover fixing the circuit board, and remove the jumper X-1. This activates the extended function, allowing more time before fault indication. The metering pump is installed with a self venting pump head, which adopts self filling liquid suction. Keep the suction line as short as possible.

2) Dismantle and replace the diaphragm of metering pump

Trouble is often encountered when removing old diaphragms. Provide some additional advice on how to remove old diaphragms.

1. After the pump head is loose, adjust the stroke length to 10% before removing the pump head. It can ensure that the electromagnetic shaft has enough pressure to keep its connection stable, so that the diaphragm can be unscrewed.

2. Pull the hydraulic end outward to separate the screw from the socket. Hold the liquid end and rotate it counterclockwise. If there is a little resistance, the diaphragm can be unscrewed.

3. The metered chemicals may crystallize at the hydraulic end, causing the ball and seat of the check valve to not work normally.

4. There may be gas leakage at the suction end of metering pump. The connecting piece on the suction side of the hydraulic end may be lack of O-ring or the connection of the suction valve may be loose.

3) A high viscosity medium is metered by flow monitoring, and flow fault indication signal is received during liquid introduction. What can be done to solve this problem?