MULTIPLE CHANNEL AUTOMATIC CONCENTRATION METER

Abstract

This system measures the concentration level of additives dissolved or sunded in a liquid by measuring the changes which the additives cause to the heat transfer characterisitics of the liquid. A plurality of cylinders and pistons sample the liquid to be measured and pump the samples past a hot film anemometer probe at a constant flow rate. A grid of wires upstream from the hot film anemometer probe is used to cause isotropic turbulence in the liquid flow around the measuring probe. The output signal from the measuring probe is proportional to the rate at which heat is transferred away from the probe by the liquid flowing past. The rate at which heat is transferred away from the probe is a function of the specific heat, thermal conductivity, viscosity, and turbulent flow characteristics of the liquid which in turn are a function of the concentration level of additives in the liquid. Calibration curves for a given additive, liquid temperature and liquid flow rate are used to determine concentration level from the measurement probe output signal.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1ROBERT G. HOWARD