The DIGOX 5 CO2 is a robust and precise system for In-line CO2 measurement of beverages. In contrast to widely available pressure/temperature systems, the DIGOX 5 CO2 measures the CO2 content directly via a physical measuring methods. Therefore the DIGOX 5 CO2 supplies a continuous signal. Dead times, which are caused by pumping out the measuring cell, do not exist.

Operating principle of DIGOX 5 CO2

The DIGOX 5 CO2 probe is calibrated at our workshop to determine directly the partial pressure of the dissolved CO2 in the beverage. The value will be passed on to the DIGOX 5 display and control unit which then calculates the concentration of dissolved CO2 in g/l. The predetermined correct solubility of the beverage can be selected by choice. This value will be corrected to the current temperature of the beverage, which is measured by a sensor belonging to the DIGOX system in the beverage piping. Any changes in the composition of the beverage (brix, alcohol, etc.) can be taken into account when calculating the solubility. If the exact value of the solubility is unknown, the system calibration can be carried out by measn of a reference value. such a value can be determined by the shaking method for example.

The DIGOX 5 CO2 operates almost free of wear and tear, because it does not contain any moving parts. In contrast to other in-line systems, the membrane only serves for sampling purposes. Therefore, the system has a high operational reliability.

The robust construction of the probe - all parts which get in contact with the sample are made of stainless steel V4A, the silicon membrane is concurrent to FDA - facilitates a long service life.

For the connection to common piping and flange systems (e.g. in-line housing VARIVENT), we offer sutable adapters. The probe is fully suitable for steam sterilization and CIP-compatible.

Advantages of continuous in-line CO2 measurement

‧The continuous and direct monitoring of the measuring values with a computer results in an increased accuracy.
‧The product quality will be more constant.
‧Laboratory staff will be relieved of routine work.
‧Information about the product quality can be recorded in detail (product re-tracking).
‧On-line information regarding the condition of fermenters, tanks and filling machines.
‧Minimization of CO2 losses.
‧Deformation and bursting of cans and bottles will be avoided due to continuous and correct measurements.

Technical data

Analyser DIGOX 5 CO2
Measuring range 0 - 10 g/l.
Accuracy Better than ±0.05 g/l.
Repeatability < ±0.1 g/l.
Response time, t90 < 30 seconds
Sample temperature  0 ... 50°C. (CIP compatible up to 130°C.)
Sample pressure max. 16 bar
Sample flow rate 1 m/s < V < 10 m/s/
Mounting length CO2-probe < 60 mm. 
　 mounting adapter for all standard Varivent in-line cases of other in-line piping connections.
Assembling position any
Housing stainless steel (1.4571), ABS / IP65
Diameter of probe 16 mm.
Weight 900 g.
　 　
Display and control unit 　
Functions calculation of concentration from the measured partial pressure, calculation depending on the type and choice of solubility. temperature correction of solubility, sample-hold at standstill in the piping (controllable via external signal). protection against unauthorized operation.
Monitoring functions Automatic carrier gas regulation, monitoring of carrier gas pressure
Calibration at our workshop: partial pressure calibration
at customers site: reference calibration
Data logger 4000 measuring values, subdevided in 5 segments
Limit values 2 freely programmable limit values
Analogue output 3 outputs, each 0(4) ... 20 mA
Interfaces RS 232, RS 485 (optional)
Power supply 90 ... 240 VAC power adapter plug
Weight approx 12 kg
Mounting wall mounting or attachment at beverage piping