1) metering pump suction is not normal
Rotate to stroke length 100%. This will rotate the entire assembly to the backplane drain vent and align with the bottom of the pump. Adjust hydraulic end and diaphragm to proper position during pump operation.
The pulse duration may not be long enough for the reaction time. With respect to the standard pulse width of 80 msec, the flow monitor pulse width extension can be activated, increasing the pulse width to 300 msec. Activate the smart change-over switch, remove the cover of the fixed circuit board and remove jumper X-1. This activates the extended function, allowing more time before the fault indication.
Dosing pump is installed from the exhaust pump head, using self-filling liquid suction. Keep the pipette as short as possible.
2) Replace the metering pump diaphragm
In the demolition of the old diaphragm, often encounter trouble. Now provide some additional tips on how to remove the old diaphragm.
1. After the pump head is loose, adjust the stroke length to 0% before removing the pump head. You can ensure that the solenoid shaft has enough pressure to keep it firmly connected, so that you can unscrew the diaphragm.
Pull the hydraulic end outward to disengage the screw from the socket. Hold the liquid side counterclockwise. Slightly more resistance, you can spin the diaphragm.
3. The metered chemical may crystallize on the hydraulic side, causing the check valve ball and seat to not work properly.
4. There may be a gas leak at the suction side of the metering pump. Fluid side suction side connections may lack o-rings or suction valve connections loose.
3) with a high-viscosity flow measurement monitoring medium, the flow received during the process of fault indication signal, how to do can solve this problem?
Move fluid end by loosening 4 pump head screws. Rotate the stroke length to 0% and grasp the hydraulic end, then slide out of the screw hole, then the screw does not come into contact with them, but also hold the back plate and the diaphragm. Then rotate this part anticlockwise, with a slight resistance, and the diaphragm will loosen from the solenoid shaft. If the diaphragm has not loosened, use some lubricant on the contact surfaces of the diaphragm and the electromagnet. After a few minutes, gently tap the diaphragm with a plastic hammer. Then proceed again as described above.
4) How to prevent the metering pump stroke positioning motor burned?
1. Remove the 4 screws securing the pump head. The screw is located on the back of the metering pump.
2. See if a drain tube is installed and the drain valve is closed? The drain valve needs to be opened during the dosing phase of the metering pump. Note: Not all dosing pumps have drain valves.
3. Install the pump head after the septum is installed and the backplane drain vent is in the upright position. Make sure that the suction valve is aligned with the leak drain hole and the hydraulic end screw is aligned with the corresponding 4 holes.
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