When running the dosing system focus on the following matters: A. Dosing pressure B. Stroke frequency C. Suction height D. Altitude E. Corrosive chemicals When the metering pump outlet for atmospheric pressure, what can be done to improve the pump Repeat metering accuracy? Installing the valve spring on the metering pump discharge valve improves repeat metering accuracy, but the most effective improvement is the installation of a backpressure valve at the end of the line. How to adjust the back pressure valve? 1. Never exceed the maximum working pressure metering pump. 2. When the dosing pump has pressure on the suction side, the pressure on the discharge side of the pump must be at least 1 bar higher than the pressure on the suction side. How to choose the right pulse damper volume? By multiplying the metering capacity (ml) per stroke of the metering pump (ml) by 26, the minimum volume (ml) of the pulsation dampener required to reduce the 90% pulsation can be obtained. How to set the pressure of the safety valve? The pressure of the safety valve can be adjusted within the range of the rated working pressure of the metering pump, and it is not allowed to exceed the maximum working pressure of the metering pump. The safety valve is designed to prevent over-pressurization of the metering pump. For example, if the maximum working pressure of the metering pump is 3 bar, the relief valve pressure should be set at 3 bar, or lower to ensure proper operation of the metering pump. Overpressure is one of the major causes of dosing pump damage. How to calculate the aspiration height if the fluid being delivered is not water? Divide the nominal aspiration height of the metering pump by the specific gravity of the metering liquid. Under what conditions is self-priming aspiration possible? Self-priming aspiration can be applied if: 1. The metered liquid is easily volatilized; 2. The metered liquid has a high specific gravity; 3. When a higher stroke frequency is required; 4. Metering pump when working in high altitude areas; 5. In the field when the application requires a larger tank, and rely on the self-priming pump is not feasible. Could you give me some advice on pump head selection? What are some common problems with chemical pump head / seal corrosion and should I avoid? The usual problem when it comes to metering pump heads is the presence of acid, chlorine, fluoride and hydrogen peroxide. Due to the different drug concentration and operating temperature, it is difficult to determine the specific pump head material. When measuring fluoride, we recommend using a Viton® sealed PVC pump head. For most chlorination applications, it is best to use an EPDM sealed NP (plexiglass) pump head. For the hydrogen peroxide mixture can only be measured PTFE PTFE sealed PTFE pump head or stainless steel pump head. The measurement of concentrated hydrochloric acid is usually Viton® sealed plexiglass pump head. Concentrated sulfuric acid can be selected PTFE sealed PTFE pump head. The manufacturer of the chemical gives advice or consult the ProMinent® Chemical Preservation Chart to determine the compatibility of the chemical with the contact material. When measuring the liquid in the pump head, what factors must be considered? The main factors to be considered are the viscosity, specific gravity, vapor pressure and temperature of the liquid.