Measurement Principle Using Circuit Diagram
The gas to be measured flows through the gas inlet nozzle (3) and through the micro capillary tube (9) located at the bottom of the MilliGascounter into the liquid casing filled with packing liquid (12).
The gas rises through the packing liquid as small gas bubbles and enters the measurement cell (13).
The measurement cell consists of two measurement chambers and is alternately filled by the rising bubbles. When a measurement chamber is filled, the buoyancy of the filled chamber causes the measurement cell to suddenly tilt to a position where the second measurement chamber begins to fill and the first measurement chamber empties.
Therefore, gas volume measurement is made in individual steps with a resolution of approximately 3 ml by calculating the tilting of the measurement cell (13) (= contents of one measurement chamber; see Section 3.2 below). When estimating/calculating the total measurement error, this "residual error" caused by the resolution (= maximum 3 ml) must be taken into account.
The tilting procedure of the measurement cell generates a pulse registered by the counter unit (1) via a permanent magnet (11) at the top of the cell and one of two magnetic sensors (reed contacts) (10).
For external data logging (PC), the switching pulse of the second reed contact can be obtained through the signal output socket (2) (refer to parameter 4.3 "Signal Output").
The measured gas is discharged through the gas outlet nozzle (4).
Performance Data
(1) Due to the physical measurement principle, the measurement error depends on the flow rate. The data acquisition software »RIGAMO« (accessory) provides an algorithm that automatically recalculates the actual measurement data to actual values at each actual flow rate based on the calibration curve.
Therefore, at a constant measurement error of ±3%, the residual error can be significantly reduced or the flow rate range can be extended. The residual error is lower than approximately ±1% across the full flow rate range.
(2) = Nominal value; exact value is determined by individual calibration.
(3) = Volume of the measurement chamber
(4) Max. operating temperature of PMMA/PVDF. Applies to the entire MGC unit. At temperatures > room temperature (e.g., when placed in a heating furnace), foam formation in the packing liquid has been monitored in special cases.
(5) If measurement begins at a high flow rate, the minimum gas inlet may be extended. In this case, higher pressure is required until the packing liquid is removed from the micro capillary in the base plate.
(6) Due to the calibration factor with two decimal places
Company Name : SNT CEO: Lee Woo-jong
Address: W 1013, The Front Misa, 11 Misagang-byeonjungang-ro, Hanam-si, Gyeonggi-do
Business Registration Number: 314-24-80398
Phone: 031-794-7980 Consultation Hours: Weekdays 09:00–18:00 (Closed on weekends and public holidays)
Measurement Principle Using Circuit Diagram
The gas to be measured flows through the gas inlet nozzle (3) and through the micro capillary tube (9) located at the bottom of the MilliGascounter into the liquid casing filled with packing liquid (12). The gas rises through the packing liquid as small gas bubbles and enters the measurement cell (13). The measurement cell consists of two measurement chambers and is alternately filled by the rising bubbles. When a measurement chamber is filled, the buoyancy of the filled chamber causes the measurement cell to suddenly tilt to a position where the second measurement chamber begins to fill and the first measurement chamber empties.
Therefore, gas volume measurement is made in individual steps with a resolution of approximately 3 ml by calculating the tilting of the measurement cell (13) (= contents of one measurement chamber; see Section 3.2 below). When estimating/calculating the total measurement error, this "residual error" caused by the resolution (= maximum 3 ml) must be taken into account. The tilting procedure of the measurement cell generates a pulse registered by the counter unit (1) via a permanent magnet (11) at the top of the cell and one of two magnetic sensors (reed contacts) (10). For external data logging (PC), the switching pulse of the second reed contact can be obtained through the signal output socket (2) (refer to parameter 4.3 "Signal Output"). The measured gas is discharged through the gas outlet nozzle (4).
Performance Data
(1) Due to the physical measurement principle, the measurement error depends on the flow rate. The data acquisition software »RIGAMO« (accessory) provides an algorithm that automatically recalculates the actual measurement data to actual values at each actual flow rate based on the calibration curve. Therefore, at a constant measurement error of ±3%, the residual error can be significantly reduced or the flow rate range can be extended. The residual error is lower than approximately ±1% across the full flow rate range.
(2) = Nominal value; exact value is determined by individual calibration.
(3) = Volume of the measurement chamber
(4) Max. operating temperature of PMMA/PVDF. Applies to the entire MGC unit. At temperatures > room temperature (e.g., when placed in a heating furnace), foam formation in the packing liquid has been monitored in special cases.
(5) If measurement begins at a high flow rate, the minimum gas inlet may be extended. In this case, higher pressure is required until the packing liquid is removed from the micro capillary in the base plate.
(6) Due to the calibration factor with two decimal places
Company Name : SNT Address: W 1013, The Front Misa, 11 Misagang-byeonjungang-ro, Hanam-si, Gyeonggi-do
Business Registration Number: 314-24-80398 CEO: Lee Woo-jong Phone: 031-794-7980 Consultation Hours: Weekdays 09:00–18:00 (Closed on weekends and public holidays)
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