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How to change the suction of the metering pump

2019-03-05 14:43:43

The metering pump is installed from the exhaust pump head and uses self-priming aspiration. Keep the pipette as short as possible. But sometimes you will find that the liquid absorption is not normal now, how to deal with this?

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. The pulse duration may not be long enough for the reaction time.

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.

When you remove the old diaphragm, you often have trouble. Now give some additional advice on how to remove the old diaphragm.


1 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.

2 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.

3 Metered chemicals may crystallize at the hydraulic end, rendering the check valve ball and seat not working properly.

4 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.

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