MODEL TEG-F20. Specification Sheet. TEG-F20 Specification Sheet Ver Copyright(C) 2011 Tsukasa Sokken Co., Ltd.
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1 Direct EGR Flow Meter MODEL TEG-F20 Specification Sheet TEG-F20 Specification Sheet Ver Copyright(C) 2011 Tsukasa Sokken Co., Ltd.
2 1. Overview Sokken model TEG series is an EGR Flow meter to measure the direct exhaust recirculation flow from an EGR valve to the intake manifold for diesel/gdi engines. A special designed laminar flow meter to withstand the high exhaust temperature is enabled to insert it in to the EGR line and measure the direct recirculation exhaust flow with fast response. The flow meter is consisted of a flow meter, pressure transducer and control/display unit. The flow meter outputs mass flow rate and volumetric flow rate at 20degC, 1atm. The removable laminar flow element allows you to clean it by yourself. 2. Specifications Specifications of Flow measurement Specification Notes Principle Laminar flow meter (differential pressure flow meter) Flow range 1 to 20 L/s (stp) 1 to 24 g/s Operating gas temp. Room temperature to 200 degc durability 300degC Operating line pressure 65 to 300 kpa(abs) durability 400kPa Accuracy +/- 3 % F.S. Calibrated with Air Response Approx. 40Hz Pressure drop L/s(STP) Flow diameter I.D. 32mm Length of measurement part 60 mm Material of laminar element SUS304 Material of body A5052 with Ni plating Dimensions W80, H80, L60 Connection P.C.D. 49 M4 See drawing of exterior Specifications of operation unit and others Operation style LCD touch panel Display contents Flow rate(operating, stp, mass) Pressure drop Line pressure Gas temperature Control temperature Calculation cycle 500Hz Analog output +/-10V Resolution 2.5mV Digital communication Ethernet 100BASE-TX RJ-45 Power supply AC100V 10A Dimensions W130, D250, H180 (measurement unit) W210, D350, H140 (operation unit)
3 3. System EGR flow meter consists of flow meter body, measurement unit and operation unit. Schematic of installation
4 4.Principle EGR flow meter is based on Laminar Flow meter. The differential ΔP pressure across a capillary is proportional to the volumetric gas flow rate assuming the flow in the capillary is laminar flow. This is called Hagen Poiseuille's law. A standard volumetric flow rate at 20degC, 1 atm is derived from volumetric flow rate, line pressure and gas temperature. The flow meter estimates composition of gas from A/F ratio. Gas density is derived from composition ratio of N2, O2, CO2, CO, H2O, and H2. A mass flow rate is derived from gas density and standard volumetric flow rate Volumetric flow rate Q OPE Volumetric flow rate at flow meter is given by next equation. Q OPE μ 20( Air) = K 20 μ T ( EX ) ΔP μ20(air): Viscosity of air at 20degC μ T(EX) : Viscosity of EGR gas at inlet temperature of flow meter K 20 : Coefficient of flow rate ΔP: Differential pressure The viscosity of EGR gas is derived from estimated composition of EGR gas The coefficient K 20 is written in follow equation. K = A X 20 Where, A and B are calibrated coefficient. B X = ΔP Pin T μ μ 20( AIR) T ( AIR) 2 P in : Absolute pressure at inlet of flow meter T: Gas temperature 4.2. Standard volumetric flow rate Q STP Standard volumetric flow rate at 20degC, 1 atm is derived from next equation T P in Q STP = Q OPE 4.3. Mass flow rate The mass flow rate(g/s) equals standard volumetric flow rate(l/s) multiplied by gas density(g/l)
5 5.Pressure drop Increase in flow rate makes increase in pressure loss. The following figure shows correlation of differential pressure (pressure drop) and flow rate Effect ガス 温 of 度 gas による temperature 流 量 計 圧 力 on 損 pressure 失 vs 体 積 drop 流 量 Standard volumetric flow rate L/s EGR 流 量 L/s (stp) Differential pressure 差 (pressure 圧 kpa drop) kpa 35.0 ガス Effect 温 度 of による gas temperature 流 量 計 圧 力 on 損 失 pressure vs 質 量 流 drop 量 (A/F=14.48) Mass flow rate EGR (A/F=14.48) 流 量 g/s g/s Differential pressure 差 (pressure 圧 kpa drop) kpa
6 6. Calibration EGR flow meters are calibrated with standard laminar flow meter. Calibration gas is heated air. Standard Electric EGR flow meter Blower heater flow meter FLOW Flow schematic of calibration 5 Result 流 of 量 flow 試 験 結 calibration 果 TEG-F20 TEG-F20 エラー Error %FS %FS (FS=20L/s) Standard 基 準 flow 流 量 rate L/s(STP) L/s(STP) Calibration data(sample)
7 7. Specification of pressure sensor and thermo sensor specification Differential pressure gauge Differential pressure of flow element Range +/- 3kPa Accuracy +/- 1%FS (linearity + repeatability + hysteresis) Response 500Hz(-3dB), 1.6ms (step response: T0-90%) without pressure lead tube Calibration temperature 70degC Max. line pressure 3.5MPa Max. differential pressure 4kPa Operating temperature 70degC notes Durability Durability controlled Absolute pressure gauge Absolute pressure at inlet of flow meter Range 0-300kPa Accuracy +/-1%FS (linearity + repeatability + hysteresis) Response 1ms, without pressure lead tube Calibration temperature 70degC Max. line pressure 400kPa Durability Operating temperature 70degC controlled Thermo sensor Gas temperature at inlet and outlet of flow meter Range 0-300degC (K type thermocouple) Accuracy +/-1degC 8. Option, custom made products Length of sensor cables, pipe connections, and data acquisition software for windows PC are provided as your request. 9. Cautions Maximum operating temperature of pressure lead tube is 200degC. Flow meter body includes electric heater. Please avoid to splash flow meter body with water. EGR gas with large amount of condensation water might cause error in flow rate. Please consider installation angle of the flow meter body not to choke the pressure lead tube with condensation water.
8 10.Packages and data sheets Flow meter body,measurement unit,operation unit Pressure leads tube(1m), A set of sensor cables(15m), Power supply cable Flow calibration data sheet Calibration method: Comparisons of air flow rate with standard laminar flow meter Number of flow calibration points: 11points(0%, 10%, 90%, 100% of rated flow) Gas temperature: room temperature, 50degC, 100degC, 150degC, 200degC, 250degC Inspection sheet Display, analog output, temperature control
9 11. Exterior The exterior of flow meter body
10 The exterior of measurement unit
11 The exterior of operation unit
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