1) The suction of the high viscosity metering pump does not rotate normally to the position of 100% stroke length. This rotates the whole unit to align the backplane drain hole 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 reaction time. The flow monitor pulse width extension can be activated to increase the pulse width to 300msec instead of the standard pulse width of 80msec. Activate the smart transfer switch, remove the cover holding the circuit board, and remove the jumper X-1. This activates the extension function, allowing for more time before a fault is indicated. The metering pump is installed with the self-exhaust pump head and adopts the self-irrigation suction. Keep suction lines as short as possible.
2) When removing the old diaphragm of the metering pump, it often encounters trouble. Here are some additional tips on how to remove the old diaphragm.
1. After the high viscosity metering pump head loosens, adjust the stroke length to 0% before removing the pump head. It keeps enough pressure on the shaft to keep it firmly connected, so it can unscrew the diaphragm.
2. Pull the hydraulic end outward to make the screw free from the jack. Grab the liquid and rotate it counterclockwise. With a little resistance, you can unscrew the diaphragm.
3. The measured chemicals may crystallize in the hydraulic end, causing the ball and seat of the check valve to not work normally.
4. There may be gas leakage in the suction end of the metering pump. The suction side connector of the hydraulic end may lack O-ring or the suction valve connection is loose.
3) The high viscosity metering pump uses flow monitoring to measure a high viscosity medium. In the process of liquid diversion, the flow failure indication signal is received. How can we solve this problem? Move the hydraulic end by loosening the 4 pump head screws. Rotate the stroke length to 0% and grab the hydraulic end, then slide out through the screw hole, so the screw does not touch them, but still holds the back plate and diaphragm. Then rotate this part counterclockwise, with a little resistance, the diaphragm will loosen from the electromagnetic shaft. If the diaphragm is not loose, apply some lubricating oil to the contact surface between the diaphragm and the electromagnetic shaft. After a few minutes, gently tap the diaphragm with a plastic mallet. Then do it again as described above.
