Patent ID: 8054065

Claim:
A method for monitoring a mixture ratio of a mixed material prepared for installation comprising the steps of: a. providing a first material mixed with taggant particles; b. providing a second material taggants-free; c. mixing the first and second materials together; d. providing a first sensor for monitoring the taggant particles in the first material prior to mixing with the second material and generating a first sense signal representing an amount of the taggant particles per unit volume of the first material flowing adjacent the first sensor; e. providing a second sensor for monitoring the taggant particles after mixing of the first and second materials and generating a second sense signal representing an amount of the taggant particles per unit volume of the mixture of the first and second materials flowing adjacent the second sensor; and f. providing a third sensor for monitoring the taggant particles and generating a third sense signal representing an amount of the taggant particles per unit volume of the mixture flowing adjacent the third sensor after generating the second sense signal and before completion of installation of the mixed material and ensuring a proper mixture of the first and second materials based upon the first and second sense signals and the third sense signal prior to installation of the mixed material.