Help and Documentation

Welcome to help and documentation for the LI-190R and LI-191R quantum sensors.

Top Resources

Terrestrial Quantum Sensors Instruction Manual


Instruction manual for the LI-190R Quantum Sensor and LI-191R Line Quantum Sensor.

Terrestrial Radiation Sensors Instruction Manual (Older models)


For older sensors. Instruction manual for LI-COR light sensors, including the LI-190, LI-191, LI-200, and LI-210.

Principles of Radiation Measurement


Brochure describing the fundamental principles of light and radiation measurements using light sensors.

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Factory Recalibration

LI-190R and LI-191R Quantum Sensor factory calibration (and the LI-190 and LI-191) is recommended every 2 years after field deployment.

What's Included with Factory Calibration?

Request Service and Recalibration

To request factory service or recalibration for a LI-COR instrument: Request Factory Service or Recalibration

Service will be performed at our US office in Lincoln, NE USA, European office (LI-COR Biosciences - GmbH), or by a distributor. To locate your country and designated point of contact click here.

Looking for a Calibration Certificate?