Meaning
Summation of current over a specific period used to calculate the total mass of a chemical species in a reaction. Electrical charge integration allows for the exact determination of trace water levels in polymers when processed through a coulometric sensor. It provides a direct link between the measured signal and the quantity of moisture in the sample.
Measuring Method
Precision in this calculation is required for resins that are sensitive to hydrolysis. As the moisture is neutralized, the system tracks every micro-ampere of current used to generate the reagent. Data accumulates.
The final result is expressed in micrograms of water, which is then divided by the sample weight to give the parts per million value.
Electrical Accuracy
Electronic noise must be minimized to ensure the integration does not include false signals. High-quality moisture analyzers use shielded circuits to protect the data during the titration process. Signals stabilize.
If the background current is too high, the electrical charge integration will overestimate the moisture content, leading to unnecessary drying times. Technicians perform blank tests to calibrate the baseline and ensure the integrator only counts the current associated with the moisture in the resin.
Precise Result
Precise integration is necessary for meeting tight material specifications.
