Injection based on volumetric flow calculations is a simple and cost effective method to add chemicals to an application, and the Signet 2551 and 2552 Magmeters are often selected for these applications.
The theory of operation for a magnetic flow meter is simple; when a conductive fluid passes through a magnetic field at the tip of the sensor body, a voltage is created that is proportional to the flow rate. When the chemical is injected into the pipe, the momentary concentration of chemical may cause a temporary disturbance of the flow measurement.
Proper system configuration is important to deliver the best performance.
If the Magmeter is installed into a pipe downstream from the chemical injection point, the effect of the chemical as it mixes with the flow stream may create a false surge in the flow rate. This anomaly will dissipate quickly, but the impact will certainly be felt in the process.
By placing the injection point downstream from the magmeter, the chemical injection operation will not interfere with the magmeter operation.
