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Quick Answer

If you dispense CO₂ for draft beer, soda, or kombucha, you need a flow meter built for cold liquid carbon dioxide at 20 bar to 35 bar. Silver Instruments supplies a dedicated CO₂ flow meter with 4-20 mA HART output, DN10 to DN25 connections, and a local totaliser display that does not fog in high-humidity cold rooms. Send us your bottle pressure, dispensing temperature, and line size for a quote today.

Why a General Flow Meter Fails on CO₂ Dispensing Lines

Most flow meters rated for compressed air or nitrogen choke when you put them on a liquid CO₂ line in a busy bar or a craft brewery. Liquid CO₂ flashes to gas if the pressure drop is too high across the meter. That flashing destroys measurement accuracy and creates vapour lock inside the measuring element. We have seen this on customer sites from a soft drink plant in Thailand to a beer distributor in Nigeria.

A Coriolis mass flow meter handles two-phase CO₂ far better than a turbine meter or an oval gear meter. The meter measures mass directly, so it does not care if 5 % or 10 % of the CO₂ flashes to vapour for a split second. The reading stays stable in kg/h or lb/min. Silver Instruments supplies a compact Coriolis sensor with a straight twin tube design that cleans in place easily. No dead legs, no clogged gears.

How We Built the CO₂ Flow Meter for Beverage Dispensing

Three things break a flow meter in a CO₂ dispensing application. First, the pressure. Commercial CO₂ tanks run at 55 bar vapour pressure at 20 °C, and the dispensing manifold sits at 20 bar to 35 bar back pressure. A flow meter with a cast aluminium housing and NBR O-rings will crack or swell within six months. Our CO₂ meter uses a 316L stainless steel wetted body, FKM seals, and a burst pressure rating above 100 bar. The housing carries an IP67 rating so it survives washdowns.

Second, the temperature. Liquid CO₂ at the dispensing point runs at -20 °C to -5 °C. The cold causes condensation on the electronics housing in tropical humidity. A standard aluminium transmitter with a glass window fogs inside and the LCD becomes unreadable. We pot the electronics in a dry nitrogen cavity and use a double-sealed glass lens with anti-fog treatment. The display stays readable even in a cold room in Malaysia where the dew point sits at 28 °C.

Third, the flow range. A bar dispensing from a single tank of 30 lb or 50 lb CO₂ may draw from 3 kg/h up to 30 kg/h during peak hours. A brewery filling kegs sees 50 kg/h to 500 kg/h. A cheap thermal mass meter drifts below 10 kg/h because the sensor does not get enough cooling from the gas. The Coriolis mass meter from Silver Instruments works from 0.5 kg/h up to 600 kg/h in the DN15 size. The turndown ratio is 100:1, which covers slow overnight trickle leaks and high-flow Saturday night peaks.

Key Specifications at a Glance

Measuring range: 0.5 kg/h to 600 kg/h (DN15 model)

Accuracy: ±0.2 % of rate for liquid CO₂ above 20 % of full scale

Process connection: Male threads 3/8 inch BSPP, 1/2 inch NPT, or Tri-Clamp 3/4 inch

Wetted materials: 316L stainless steel, FKM O-rings

Output: 4-20 mA HART, pulse, RS485 Modbus RTU

Power: 24 V DC (loop powered or separate, your choice)

Housing: IP67, stainless steel or powder-coated aluminium

Approvals: ATEX Zone 2 option for CO₂ storage rooms, CE, RoHS

Local display: Backlit LCD, shows mass flow rate, total, temperature, density

CO₂ Totaliser for Cylinder Tracking

Gas distributors in Africa and Latin America often ask us for a meter that tells them exactly how many kilograms of CO₂ a bar or restaurant consumed per day. The built-in totaliser stores the running total in a non-volatile memory. You can reset it with a magnetic key without opening the housing, so the delivery driver can zero the total after swapping a cylinder and record the previous total.