• Carbo 520 Optical: Sensor module with sapphire and Electronic housing
  • Sapphire in a robust steel housing
  • Carbo 520 Optical installed in the main line with the evaluation unit mPDS 5
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Optical CO₂ sensor:
Carbo 520 Optical

A new kind of certainty in beverage production

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Part number: 104600
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Anton Paar’s patented* innovations offer you true values: on any beverage – at any time.

With the new Carbo 520 Optical inline sensor you always know the actual CO₂ concentration of all beverages in your process. In addition to process monitoring, the measuring interval of 4 seconds enables a reliable and stable closed-loop control of carbonators.

Key features

Save time– ready to measure right out of the box

Save time– ready to measure right out of the box

Benefit from a single measurement method and start measuring immediately after installation without time-consuming adjustments. Due to a unique and patented* model for determining CO₂ concentrations from measured values, the factory adjustment allows direct use of Carbo 520 Optical right out of the box.

Save money – low total costs of ownership (TCO)

Save money – low total costs of ownership (TCO)

Save on running costs: While conventional CO sensors can multiply their price over an entire service life due to recurring maintenance, Carbo 520 Optical is completely maintenance-free.

  • Soldered optics without any seals to maintain
  • No moving parts with wear
  • Self-diagnosis according to NAMUR NE 107
Be flexible – product-independent measurement

Be flexible – product-independent measurement

Spend your time on production: Carbo 520 Optical measures any kind of beverage without requiring time-consuming product-specific adjustments. Unique and patented* compensation of extract or sugars provides product-independent operation. No matter whether carbonated soft drinks, beer, wine, or sparkling water, Carbo 520 Optical makes your product changes easier.

  • Automatic extract compensation due to multichannel measurement
  • Recipe-independent CO₂ measurement
Always ready for operation – even right after CIP

Always ready for operation – even right after CIP

Our patented* internal scavenging technology eliminates the risks of incorrect measurements due to residual CO₂. This avoids drifts at any time, also after CIP procedures, where CO₂ is released inside the sensor housing. Carbo 520 Optical is EHEDG-certified hygienic, which reduces the time and effort during the cleaning procedures stated above.

Be continuously connected to your production line

Be continuously connected to your production line

Carbo 520 Optical is part of our well-established Smart Sensor platform. This concept ensures connectivity to Anton Paar's lab systems via Davis 5 and in addition it offers a broad range of communications protocols:

  • Digital and analog inputs and outputs
  • EtherNet/IP
  • Modbus TCP

Available in the following three configurations:

  • Carbo 520 Optical Smart Sensor combined with an mPDS 5 evaluation unit
  • Carbo 520 Optical Smart Sensor with Operating Terminal (OT) - measurement values are displayed directly on the instrument, no evaluation unit required
  • Carbo 520 Optical Smart Sensor with a Remote Operating Terminal (ROT) - can be mounted at a distance of up to 250 meters from the sensor

* AT 512 375 B1, CN 103 257 125 B, US 9 063 083 B2, AT 512 291 B1

other patents pending

Technical specifications

Measuring range 0 to 12 g/L (0 - 6 vol)
Accuracy ±0.05 g/L (0.025 vol)
Repeatability ±0.01 g/L (0.005 vol)
Resolution < 0.01 g/L (0.005 vol) 
Measuring temp. range- 3 °C to 30 °C
Ambient temp. range - 10 °C to +55 °C @ T = -3 °C
- 10 °C to +45 °C @ T = 30 °C
Maximum temperature < 95 °C (max. 4h)
Pressure max. 10 bar rel. (145 psi rel.)
Measuring interval min. 4 seconds
Self-diagnosis Compliant with NAMUR recommendation NE107
Degree of protection IP 67 (NEMA 6), IP 65 (NEMA 4)
Process connection Tuchenhagen Varivent® N
Certifications EHEDG Type EL Class I
Power SELV DC 24 V (DC 20 V to 30 V), max. 25 W
Fieldbuses (optional)

Modbus TCP

Dimensions (WxHxD) 174 mm x 174 mm x 231 mm
Weight approx. 4 kg

Anton Paar Certified Service

The Anton Paar quality in service and support:
  • More than 350 manufacturer-certified technical experts worldwide
  • Qualified support in your local language
  • Protection for your investment throughout its lifecycle
  • 3-year warranty
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