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PT100 Flow Cell

EP-TA1 Gas. PT100 Flow Cell. Pt100 Flow Cell design How it works ELMB flow scan system Flow Cell calibration Tests for stability in gas flow measurements. October 2003. Serguei Morozov. EP-TA1 Gas. Pt100 Flow Cell design. October 2003. Serguei Morozov. EP-TA1 Gas.

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PT100 Flow Cell

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  1. EP-TA1 Gas PT100 Flow Cell • Pt100 Flow Cell design • How it works • ELMB flow scan system • Flow Cell calibration • Tests for stability in gas flow measurements October 2003 Serguei Morozov

  2. EP-TA1 Gas Pt100 Flow Cell design October 2003 Serguei Morozov

  3. EP-TA1 Gas How it works 20°C ~ 30 sec October 2003 Serguei Morozov

  4. EP-TA1 Gas ELMB flow scan system ELMB128 with the Atmega128L processor Power supply card and Mother Card October 2003 Serguei Morozov

  5. EP-TA1 Gas ELMB flow scan system • ELMB128 specification • 128 Kb of on-chip flash memory, 4 Kb of SRAM, 4 Kb of EEPROM, • Programming via CAN bus (“FLOWsCAN”, Henk Boterenbrood, NIKHEF ) • 6 bipolar or unipolar input ranges (25mV - 5V) • 64-channel multiplexer Twisted pair CAN bus ELMB128 October 2003 Serguei Morozov

  6. EP-TA1 Gas Flow Cell calibration Calibration curve (ArCO2CF4) First polynomial fit Second polynomial fit October 2003 Serguei Morozov

  7. EP-TA1 Gas Flow Cell calibration Flow DataBase Polynom coeff. (Flow=p0+p1*x+..) Slope DataBase fl(1)=p0+p1*x.. fl(2)=p0+p1*x.. fl(3)=p0+p1*x.. Slope Flow October 2003 Serguei Morozov

  8. EP-TA1 Gas Stability tests  Tamb = 0.18 K / ADC count 1.0 l/h  1.4 % 70 l/h  Slope = 20 mK/sec 0.6 l/h = 10 % 6 l/h October 2003 Serguei Morozov

  9. EP-TA1 Gas Stability tests 28°C 55 l/h 21°C 50 l/h  Slope mK/sec  5 –7  Tamb K October 2003 Serguei Morozov

  10. EP-TA1 Gas Stability tests The same positions in Manifold The different positions in Manifold October 2003 Serguei Morozov

  11. EP-TA1 Gas Stability tests  5mm  3mm Pressure drop at 100 l/h : • 3mm:  1 mbar/cell • 5mm:  0.5 mbar/cell October 2003 Serguei Morozov

  12. EP-TA1 Gas Conclusions • PT100 flow cell has designed (ELMB read-out, mother card) • Parameter optimization and stability test were performed: • Time to measure 1 pair of cells (input and output): ~ 30 sec • Minimum error: ± 1 l/h • Temperature stability: + 0.7 l/h per °C ( T=20°C  24°C : 50 l/h  53 l/h) • Gas flow ranges were estimated: •  5mm flow cell: 0-30 l/h… 150 l/h and higher.. •  3mm flow cell: 80 l/h and higher.. October 2003 Serguei Morozov

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