Les compteurs de gaz à soufflet RITTER sont applicables pour mesurer le volume de gaz inerte et sec en circulation et sont particulièrement efficaces pour les débits de gaz élevés. Le principal avantage des compteurs de gaz volumétriques est que le volume est directement mesuré par le principe du déplacement.
Table of Contents
Application
RITTER Bellows-type Gas Meters are applicable for measuring the volume of flowing inert and dry gases and are particularly effective at high gas flows. Please note that gases containing aggressive components or water vapour may reduce the life span of bellows-type gas meters, if the casing of the measuring unit (tinplate), the valve/control elements (polyamide) or the bellows (Perbunan®) should be attacked. Further details on the materials that may come into contact with gases can be found under Materials.
The desired measurement range can be selected from among 6 magnitudes (types) extending together as a whole from 40 ltr/h to 160 m3/h at a gas temperature ranging from +5 °C to +40 °C. The solidly soldered casing on the standard model is designed to withstand a maximum overpressure of 50 mbar (BG 40/100: 0.5 bar).
Advantages
The major advantage and the superiority of volumetric gas meters (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 by the principle of displacement. That means that the condition and the composition of the gas has no influence on the measurement accuracy.
The measurement principle and the design of the measuring unit enables a measuring accuracy of ±2%.
Correcting factors which take into account gas type, temperature, humidity etc are therefore not necessary(1). 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 Gas 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 option »Pulse Generator«) and can therefore used »in the field as well without problems. (1) The measurement of temperature and pressure is necessary, if the measured and indicated actual volume of gas must be recalculated into the norm volume (as with any measurement of gas volume).
(1) L'étalonnage est effectué à un débit standard et à 20 °C (2) Division de numérotation minimale
Précision de mesure: +/- 2% au débit standard et à 20 °C (la valeur exacte est indiquée dans le certificat d'étalonnage individuel)
Écart de température: +5 °C à +40 °C
Pas de sens inverse possible!
Measurement Principle
The measurement of RITTER Bellows-type Gas Meters works on the principle of displacement. The Gas Meters contain a twin-chamber measuring unit with a flexible bellow within each chamber. Thus, a compulsory measurement of the gas flow is possible when these chambers are periodically filled and emptied. The design of the measuring chamber is such that the measuring volume per cycle of the bellows is constant. Because of the measurement principle the actual volume is measured. The movement of the bellows is caused by the pressure difference between inlet and the outlet of the meter. The periodical filling is controlled by means of two sliding valves. The oscillating movement is transformed into a rotational one and is mechanically transmitted to the counter through a magnetic coupling.
Outer casing of the meter: Material: Zinc-coated steel sheet (soldered) with outside also lacquered.
Casing of the identical twin chambers of the Meter. Material: Tinplate
Non-flexible part of membrane. Material: Tinplate sheets. Flexible part of membrane.
