Bellows-type Gas Meter, BG10

Description

Bellows-type Gas Meter, BG10

PRODUCT DESCRIPTION

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 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.

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).

Performance Data

Top of Form

Bottom of Form

Type	Flow Rate Minimum [ltr/h]	Flow Rate Maximum [ltr/h]	Flow Rate Standard [ltr/h](1)	Readout Indicator Minimum [ltr](2)	Readout Indicator Maximum [ltr](2)	Maximum Gas Inlet Pressure [mbar]
BG 4	40	6,000	3,000	0.1	99,999,999	300
BG 6	60	10,000	5,000	0.2	99,999,999	300
BG 10	100	16,000	10,000	0.5	999,999,990	50
BG 16	160	25,000	15,000	0.4	999,999,990	50
BG 40	400	65,000	39,000	0.4	999,999,990	500
BG 100	1,000	160,000	95,000	0.4	999,999,990	500

⁽¹⁾ At standard flow and 20 °C (68 °F) the measurement error (±0.2%) is determined
⁽²⁾ Minimum dial division

Measuring accuracy: +/- 2% at standard flow and 20 °C (exact value is stated in individual Calibration Certificate)

Temperature range: +5 °C to +40 °C

No reverse flow direction possible!

 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 use »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).

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.

Legend

1. Outer casing of the meter: Material: Zinc-coated steel sheet (soldered) with outside also lacquered.
2. Casing of the identical twin chambers of the Meter. Material: Tinplate
3. Non-flexible part of membrane. Material: Tinplate sheets
4. Flexible part of membrane. Material: Textile-reinforced nitrile rubber (Perbunan).
5. Gas entry to the chamber.
6. Gas outlet

Equipment

• 8-digit Totalizing Roller Counter
• Gas Pipe Connection: Inch Thread
• Large, One-needle Dial
• Magnetic Coupling (between the measuring drum and counting mechanism)
• Twin-Chamber Measuring Unit

Materials

• Casing: BG 4 – BG 16: zinc-coated steel sheet (soldered) with outside also lacquered / 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

Built-in Options

• Pulse Generator, standard or Ex-proof version (for connecting Electronic Display Unit/Computer
• LCD Display, resettable, 8-digit (replaces Totalizing Roller Counter)

Accessories (external)

• Thermometer (BG)
• Manometer for pressure pmax = 60mbar
• Electronic Display Unit ,displays volume and calculates flow rate via RS232 and analog-output in real time (pulse generator required)
• Nozzles for flexible tube connection