%A"Varpula, T [VTT Automation, Espoo (Finland). Measurement Technology]" %D1998 %I; VTT Energy, Jyvaeskylae (Finland) %2 %J[] %K32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION, PAPER INDUSTRY, PAPER, PRODUCTION, WATER, IMPEDANCE, MEASURING METHODS, CHEMICAL STATE, CIRCULATING SYSTEMS, MONITORING, ELECTRICAL PROPERTIES, BENCH-SCALE EXPERIMENTS %PMedium: X; Size: pp. 125-129 %TMonitoring of the state of the paper machine circulation water with a wide-band impedance measurement; Paperikoneen kiertoveden tilan seuranta laajakaistaisella impedanssimittauksella - MPKT 02 %XA new measurement method for monitoring the chemical state of the circulation water in the paper machine is proposed and studied. In the method, the electrical properties - conductivity and permittivity - of the water are measured in a wide frequency band: 20 Hz - 10 mhz. Large-molecule organic compounds in the water are expected cause characteristic changes in the dielectric properties of the water. Continuous monitoring of the permittivity in the wide frequency band thus reveals their presence. Various electronic measurement setups for the measurement are constructed and studied by using test samples. If the method turns out to be promising, a prototype device will be made. (orig.) %0Technical Report %NNEI-FI-362;Other: ON: DE99771568; TRN: FI9903385 %1 %CFinland %Rhttps://doi.org/ Other: ON: DE99771568; TRN: FI9903385 FI %GFinnish