First of all, when the metering pump is installed in order to prevent installation problems, resulting in the liquid can not accurately measure the special note the following: 1. Export higher than imports, to avoid siphon phenomenon 2. Pump head and injection valve require vertical installation 3. The attached tube can be tightened by hand, do not use the tool; the thread does not use the raw material belt 4. The supply voltage is stable and grounded 5. Clean, spacious and well-ventilated installation When problems arise due to midway use, let's analyze the common faults in metering metering: 1) The metering pump does not spin up properly to 100% of stroke length. 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) Dismounting the dosing pump diaphragm When removing the old diaphragm, it is often troublesome. 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) Metering a high-viscosity medium with flow monitoring and receiving a flow fault indication signal during the priming process. What to do to solve this problem? By loosening the 4 pump head screws, move the hydraulic end. 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 hydraulic pump has not loosened, use some lubricant on the contact surfaces of the diaphragm and the magnetic shaft. 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 four screws fixing the pump head. The screw is located on the back of the metering pump. 2. See if a drain tube is installed and drain valve 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 the suction valve is aligned with the leak drain hole and the hydraulic end screw is aligned with the corresponding 4 holes. 5) hydraulic metering pump flow smaller or inaccurate? 1. Unscrew the bleed valve in the three valves. 2. Full charge by filling valve.
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