Bellows-type Gasmeters BG-Series (Dry-Type)
Measurement Principle
The measurement of RITTER bellows-type Gas Meters works on the principle of displacement. The Gas Meters contains 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.
Principle of operation
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.
Schematical cross-section of a bellows-type gas meter
Legend
- 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. Material: Textile-reinforced nitrile rubber (Perbunan).
- Gas entry to the chamber.
- Gas outlet
Subject to alterations