SAGINOMIYA SEISAKUSHO, INC.粘度の検出原理DETECTING PRINCIPLE OF VISCOSITY右図のように内径(D)が一様な細管内を層流条件で粘性流体を流すと、粘性により差圧(ΔP)が発生します。細管の長さ(ℓ)及び流量(Q)を一定にすると、粘度(μ)と差圧(ΔP)は比例関係になります。(Hagen-Poiseuilleの法則)πD4μ=A・ΔP〔cP〕ただし A=―128Qℓ流量〔Q〕は定流量ポンプにより一定に保持されています。●●粘度センサの構成右図は粘度センサの構成を示したものです。細管に生ずる差圧(ΔP)を差圧センサで検出し、それを電子回路で演算して、最終的にDC0〜200mVの電気信号として出力させます。●●粘度―出力電圧特性VISCOSITY-OUTPUT VOLTAGE CHARACTERISTIC CHART●●粘度換算表VISCOSITY CONVERSION TABLEThe numerals below of mm2/sare obtained at Fuel Oil Gravity of 0.9cP510172030404550mm2/s5.611.118.922.233.344.450.055.6cP : Centipoise=mPa・s (Absoulte Viscosity)mm2/s (Kinematic Viscosity)When a viscous fluid flows in a laminas condition of uniformed diameter (D), pressure difference (ΔP) will be created (See the Figure left). When tube length (ℓ) and flow amount (Q) are constant, the viscosity (μ) and pressure differential (ΔP) will be in proportional relation. (Hagen-poiseuille law)πD4μ=A・ΔP〔cP〕Where A=―128QℓFlow amount (Q) is kept constant by a pump of constant flow rate.●●VISCOMETER (VISCOSITY SENSOR) STRUCTUREThe Figure right presents the structure of a Viscometer (Sensor). The Pressure Difference (ΔP) developed in the tube is detected by semiconductor sensor and computed by an electronic circuit to be sent as electric signal of 0 to 200mV. DC.Accuracy ± 1mPa・s (Warrant Limit)Output Voltage (mV)20018016014012010080604020025101520253035404550Absolute Viscosity (mPa・s=cP)Viscous FluidQ (Flow Quantity)=ConstantD(Inner Diameter)ℓ (Tube length)ΔP (Diff. Pressure)Tube24V. AC Power Supply100V. AC 60Hz Power SupplyMotorConstant Flow PumpDiff. Pressure SensorMeasuring FluidFluid SuctionDiff. Pressure AMPViscosity SignalTemperature SignalTemperatureSensor