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Dräger Polytron 5720

Quick, reliable and cost-effective detection of carbon dioxide in ambient air: the microprocessor-based Polytron 5720 transmitter is the result of more than 40 years of experience in measurement technology and contains a new, innovative IR sensor with drift-free optics. These optics are extremely resistant against deposits and insects in the beam.

Proven – and still getting better: Dräger Measurement Technology

Dräger has been developing and manufacturing sensors and gas detectors for industrial use for more than 40 years. And with each new device generation, we drive our measurement technology a bit further. With the Polytron 5720, you will definitely benefit from this experience and power of innovation. Its DrägerSensor is based on an open, double-compensated optical infrared system. This innovative design offers the following advantages:

  • short response times
  • low sensitivity to dust or dirt deposits on the optical surfaces and to insects in the measuring cuvette
  • longer maintenance intervals
  • drift-free output signal
  • high signal stability thanks to an extremely light-efficient optics with a 4-beam signal-stabilizing system



Optional: Two mounting sets for easy flange-mounting

The housing has four mount holes. Two different mounting sets are available for installing the Polytron 5720: a ductmount and a pipe mount set. This means that the transmitter can be easily installed anywhere – e.g., on a smooth wall, a pipe or an exhaust duct.


Easy and cost-effective: Single-operator calibration

​The transmitter settings can be changed and maintenance carried out without opening the housing. Declassification of the hazardous, classified area is not necessary. Use the magnetic wand to quickly and easily select menu items and functions. An additional hand held terminal is not required.


Optional: Three relays for controlling external Equipment

Upon request, the Dräger Polytron 5720 can be supplied with three integrated relays. This enables you to use it as an independent gas detection system with two arbitrarily adjustable concentration alarms and one fault alarm. Audio alarms, signal lights, or similar devices can, thus, be controlled locally – without an additional cable between the transmitter and a central controller. The sensor signal can be evaluated using the 4 to 20 mA signal.


Quick and easy wiring

The electronics and the bezel form a single unit. Simply pull them out of the housing. Then insert the three-wire cable into the terminals – either through the Ex-e cable gland or through the seal on the conduit. Finally, plug the terminal block into the PCB.


Further advantages


  • Available as flameproof or increased safety version
  • Aluminum or 316 L stainless steel housing for the most extreme industrial conditions
  • Extremely user-friendly software thanks to a minimum number of menu items
  • Backlit display: easy to read, even in the dark and without a flashlight
  • Traffic light status indicator (green = no danger, yellow = error, flashing red = gas alarm)
  • Beam block warning signal if the optics are heavily contaminated
  • Measuring ranges in the ppm and Vol.% range



Brochure: Gas List 2015 (PDF)

List of detectable gases and vapours.

Brochure: Functional Safety and gas detection systems (PDF)

Safety Instrumented Systems are used to reduce the risk for the protection of people, plants, and environment.

Brochure: More than the sum of their components (PDF)

?For over 70 years, Dräger has been one of the technology leaders in gas detection.