MilliGascounters
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- Digital display with programmed calibration factor
- Battery operated; battery life-time 4-5 years
- Low maintenance
The MilliGascounters (MGC) are designed for the volumetric measurement of the smallest amounts of gas with ultra-low flow rates. They are suitable for measurement of all inert, slightly corrosive gases such as biogas and aggressive gases as well as for volumetric leak detection.
Application
RITTER MilliGascounters (1) (MGC) are designed for the volumetric measurement of the smallest amounts of gas with ultra-low flow rates. They are suitable for measurement of all inert, slightly corrosive gases such as biogas (PMMA model) and aggressive gases (PVDF model). Furthermore, MilliGascounters can be used for volumetric leak detection. (1) Developed at the University of Applied Sciences Hamburg, Prof. Dr. Paul A. Scherer
Display, Signal Output
The volume of the measured gas is displayed on the electronic digital display located on top of the MGC casing. Additionally, a floating reed contact can be used as a signal output.
Data Acquisition with PC
For data acquisition of gas volume and flow rate the Windows software »RIGAMO« is available. The data of up to 24 Ritter gas meters can be transmitted to the USB port of a PC.
Available Models (Materials)
The MGCs are available in the following casing/measurement cell materials:
- PMMA/PVDF
- PVDF/PVDF
- PVC-red/PVC-red
Standard Equipment
- Twin-chamber measurement cell
- LCD Display, resettable, 8-digit
- Pulse Generator V6.0 (Reed Contact), as signal output (floating output)
- Level
- Gas connection tube (PVC), 1.5 m
- Screw-type tube connection for connection tube:
- Connection gas inlet/outlet:
- Funnel, for filling of liquid
- Packing liquid, 200 ml
- Syringe, for fine adjustment packing liquid level
- Cleaning rod for micro capillary, per each 1 to 5 MGC’s
Accessories
- HCl solution 1.8 vol% for gas mixtures with CO2
- Available quantities: 100 / 200 / 500 / 1,000 / 5,000 ml
- Packing Liquid Silox for gas mixtures without CO2
- Filter 0.45 micron for gas inlet tube
- Filter-Check Valve Combination
- Back-pressure valve for gas inlet tube
Performance Data
| Minimum flow Qmin | 1 | ml |
| Maximum flow Qmax | 1 | ltr/h |
| Measurement accuracy (1) | ±3 | ±1 | % |
| Measuring drum volume, approx (2) | 3 | ml |
| Min. measuring volume (resolution) (3) | 3 | ml |
| Packing liquid quantity, approx | 120 | ml |
| Diameter | 98 | mm |
| Height | 109 | mm |
| Weight | 475 to 650 | g |
| Maximum gas inlet pressure | 100 | mbar |
| Minimum gas inlet pressure | 8 | mbar |
| Gas inlet pressure at start of measurement (5) | 9 | mbar |
| Gas Temperature (4) | 10 to 60 / 80 | °C |
| Minimum dial division (6) | 0.01 | ml |
| Maximum indication value (6) | 999,999.99 | ml |
| Connection gas in/outlet | Screw-type tube coupling | |
| Outside-Ø | 6 | mm |
| Inside-Ø | 4 | mm |
(1) Because of the physical measurement principle, the measurement error is dependent on the flow rate. The data acquisition software »RIGAMO« (accessory) provides an algorithm, which automatically recalculates the actual measurement data to the real values at the respective actual flow rate on the basis of the calibration curve. Thus, the remaining error can be reduced significantly or the flow rate range can be extended at the constant measurement error of ±3%. The remaining error is better than approx. ±1% across the full flow rate range.
(2) = Nominal value; exact value will be determined by individual calibration
(3) = Volume of measuring chamber
(4) Max. Operating temperature for PMMA/PVDF/PVC. For complete MGC unit applies: With temperatures > room temperature (e.g. if placed in heating furnace) a foam formation of the packing liquid was monitored in particular cases.
(5) The minimum gas inlet may be increased if the measurement starts with a high flow rate. In this case a higher pressure is needed until the micro capillary in the base plate is clear of packing liquid.
(6) Because of calibration factor with 2 decimals
Specs
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Product Specification
The gas to be measured flows in via the gas inlet nozzle, through the micro capillary tube located at the base of the MilliGascounter and up into the liquid casing which is filled with the packing liquid. The gas rises as small gas bubbles through the packing liquid, up and into the measurement cell.
The measurement cell consists of two measuring chambers, which are filled alternatingly by the rising gas bubbles. When a measuring chamber is filled, the buoyancy of the filled chamber causes the measurement cell to tilt abruptly into a position where the second chamber begins to fill and the first chamber empties.
The measurement of gas volume therefore occurs in discrete steps by counting the tilts of the measurement cell with a resolution of approximately 3 ml (= content of one measuring chamber). This »residual error« (= max. 3 ml) caused by the resolution should be taken into account when estimating / calculating the total measurement error.
The tilting procedure of the measurement cell generates a pulse through the permanent magnet on top of the cell and one of the two magnetic sensors (reed contacts) , which is registered by the counter unit.
For external data logging (PC) the switching pulses of the second reed contact can be obtained via the signal output socket .
The measured gas exits through the gas outlet nozzle.
Specification Detail of the MilliGasCounter
Flow Range
Minimum flow rate 1 ml/h
Maximum flow rate 1 ltr/h
Accuracy
±3% / ±1% (1)
Max Gas Inlet Pressure
Minimum 5 mbar
Maximum 100 mbar
Display Accuracy
0.01 ml
Operating Temp.
+10 ∼ +40 °C
Connection
Gas connection PMMA Plug-in connector
Gas connection PVC Hose barb
Gas connection PVDF Compression fitting