At-line Analog CO2 meter for beer and carbonated beverages (CO2 GEHALTEMETER) Type GMAS
The analog CO₂ meter type GMAS enables the determination of CO₂ content in beer, carbonated beverages and sparkling wines in cylindroconical tanks, conditioning tanks or KEG casks, expressed in volumes and g/L.
Measurement Principle:
The instrument uses Henry’s law. The CO₂ content is determined by measuring the temperature and the partial pressure of CO₂ in equilibrium after mechanical shaking of the beverage.
Working Procedure:
The device’s inlet ball valve is connected by a silicone hose to the sampling valve on the pipeline or tank in operation. The measuring chamber of the device is filled with a sample of the beverage. Once the measuring chamber is filled, the outlet valve is closed first, followed by the inlet valve. Then the pressure in the measuring chamber is zeroed by brief opening and closing of the outlet valve. The release of bound carbon dioxide from the beverage is carried out by shaking until a constant pressure is reached (until the pressure stops increasing). Then the partial pressure in equilibrium is read on the manometer and the temperature on the digital thermometer. The CO₂ content is read from the nomogram in g/L and in volumes.
Technical data:
| Parameter | Range / Value | Accuracy |
| CO₂ measurement | 2 to 7.8 g/L (1 to 4 vol) | 0.2 g/L or 0.1 vol |
| Temperature | −3 to +30 °C | 0.5 °C |
| Pressure | 0–400 kPa (0–6 bar) | 1.6 % |
| CO₂ Reading | Nomogram | — |
| Dimensions (H×W×D) | 270 x 200 x 140 mm | — |
| Weight | 1.1 kg | — |
Scope of Delivery:
- CO₂ meter type GMAS, operation manual.
Accessories (not included in standard delivery, available on request):
- Inlet and outlet silicone hoses
- Sampling head for KEG casks
Main disadvantage:
- The need for manual shaking to release CO₂, which is slower and places higher demands on the operator in terms of measurement accuracy.
Advantages & Benefits:
- Best price: The simple design guarantees the lowest acquisition cost.
- Tradition and reliability: Over 25 years of development and thousands of satisfied users worldwide.
- Repairable, spare parts available.
Downloads
Product sheets, catalogues and technical documentation.
Frequently asked questions
Differences between GMAS, GMA and GMD models?
- GMAS & GMA are analog with nomogram-based CO₂ reading.
- GMD measures pressure & temperature automatically and displays CO₂ in g/L and volumes.
- GMD & GMA release CO₂ via piston pressure pulse (fast & reproducible).
- GMAS requires manual shaking until steady pressure (slower, less reproducible, cheapest).
Here is an overview table of the differences and characteristics of the individual types:
| Function / Feature | GMAS | GMA | GMD |
| Measurement Type | Analog (manometer) | Analog (manometer) | Digital (display) |
| CO₂ Release Method | Manual shaking | Pressure impulse by piston | Pressure impulse by piston |
| Result Determination | Nomogram | Nomogram | Automatic calculation |
| Speed and Accuracy | Lower (operator dependent) | High (reproducible) | Highest (automated) |
| Price Level | Most affordable | Mid-range (excellent price/performance ratio) | Premium |
Who is the GMAS suitable for?
The GMAS is suitable for the smallest producers of carbonated beverages and microbreweries.