In-line bulk concentration measurement by method of conductivity in industrial KDP crystal growth from aqueous solution

The conductivity of KH2PO4 (KDP) aqueous solutions with varying saturation temperature from 28.5 degreesC to 41.8 degreesC was measured in the tempera ture range of 30 degreesC to 40 degreesC. It's proposed that the conductivi ty of KDP solutions can be expressed by L=L-0+b(1)T+b(2)T(2). This relation can be interpreted by Falkenhagen's (1971) conductivity model of high conc entration electrolyte solution. The experimental data agrees well to the re lation with an accuracy of super-saturation within +/-0.03g KDP/100g water (+/-0.10% relative super-saturation).