The desired measurement range can be selected from among 6 magnitudes (types) extending together as a whole from 40 ltr/h to 160m3/h at a gas temperature ranging from -20o to +50 Celsius. The solidly soldered casing on the standard model is designed to withstand a maximum overpressure of 50 - 500 mbar depending on the meter type.
The measure of Ritter bellows type gas meters works on the principle of displacement. The gas meters employ a twin chamber measuring unit with a deformable bellow within each chamber. Thus, a compulsory measurement of the gas flow is possible by periodically filling and emptying these chambers.
The design of the measuring chamber is such that the measuring volume per cycle of the bellows is constant Among other advantages, this design of the measuring unit enables a measuring accuracy of +/-2 per cent.
The major advantage and the superiority of volumetric gas meter (like Bellows type Gas Meters) over other measurement principles, which determine gas volume using secondary measurable variables such as speed, heat capacity, hot wire resistance or similar, is that the volume is directly measured. That means that the condition and the composition of the gas has no influence on the measurement accuracy.
Correcting factors which take into account gas type, temperature, humidity etc are therefore not necessary. It should be noted that with other, non volumetric measurement processes, the measurement accuracy given for that process can only be achieved if the correcting factors for the immediate condition of the gas are exactly known.
All RITTER bellows-type gas meters include the following as standard equipment:
- Twin-chamber measuring unit
- 8-digit totalizing counter
- large, one-needle dial
- magnetic coupling (between the measuring drum and counting mechanism)
- gas pipe connection: inch thread.
- Measuring accuracy: +/- 2 per cent at standard flow and 20° Celsius (exact value is stated in individual Calibration Certificate)
- Temperature range: -20 to +50° Celsius
- Flow rate (measuring range) and meter indication
- Maximum gas inlet pressure (overpressure):
BG 4, BG 6: 300 mbar
BG 10, BG 16: 50 mbar
BG 40, BG 100: 500 mbar
- Casing: BG 4 - BG 16: zinc-coated steel sheet (soldered) with outside also lacquered
- Casing: BG 40 - BG 100: powder-coated steel sheet with outside also lacquered
- Measuring unit: tinplate
- Bellows (within measuring unit): textile-reinforced Perbunan
- Rod linkage: BG 4: polyamide; all others: polyamide/brass
- Slide gate: Bakelite
The measurement principle and the design of the measuring unit enables a measuring accuracy of ±2 per cent.
Correcting factors which take into account gas type, temperature, humidity etc are therefore not necessary. It should be noted that with other, non-volumetric measurement processes, the measurement accuracy given for that process can only be achieved if the correcting factors for the immediate condition of the gas are exactly known.
The Ritter bellows-type meters need no maintenance and no set-up prior to the measurement. They are easy to carry, don’t need a power supply (unless equipped with optional Pulse Generator) and can be used in the field as well without problems.
For further information about Gas Flow Meters visit Ross Brown Sales at http://www.rossbrownsales.com.au
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