Cobia Flex R/F

Amazingly easy to use, and ideal for straightforward routine inspections. Use Cobia Flex R/F to measure all the X-ray output parameters: kV, Dose, Dose Rate, HVL, Total Filtration, Pulse Rate, and Exposure Time. It is straightforward to set up, and you will save a lot of time.

Determine patient safety every day

The Cobia Flex R/F offers you the convenience to make your X-ray Quality Control as quick and accurate as possible. It is just as easy as the Cobia Smart but with even more possibilities. It has an internal detector, a detector input that offers the ability to connect different probes and ion chambers, and an optional built-in mAs. The measured values can be read directly from the large and clear display, and stored in the Cobia Flex R/F to read later.

Cobia Flex R/F users also have the possibility to use a tablet or a PC, saving data to a computer, printing reports, using analyses, and much more. The X-ray QA software, Ocean, exhibits the Cobia’s capabilities and adds benefits that make the workflow more practical and simple. Ocean makes it possible to perform remote X-ray QA measurements with your Cobia Flex R/F. You simply connect to your Cobia Flex R/F, via Bluetooth, or with a USB cable to your PC or Tablet – then measure.

With the addition of Ocean Professional, the Cobia Flex R/F truly becomes an indispensable X-ray QA tool. Perform your QA work without any worries – sensitivity, kV ranges, or waveform types. It is automatic!

Read about the Cobia Flex with mAs “Covid-19 Kit” >

Cobia Flex R/F Key features

  • Easy to position, no position dependence
  • Large rotatable display
  • Log/History function
  • Pulsed radiation analysis
  • Full Auto range for kV, TF and Sensitivity
  • Built-in mAs (optional)
  • Plug n Play
  • Bluetooth and USB communication
  • Solid-state detectors = no need to compensate for temperature & pressure
  • Built-in energy compensation
  • Can be used together with ion chambers
  • Automatic recognition of external probes
  • Long-lasting rechargeable battery
  • Always free firmware upgrades
  • Up to 10-year warranty
  • Two-year Calibration Cycle

Cobia Flex R/F

  • Weight (approx.)
    280 g
  • Size
    140 x 78 x 28 mm³
  • Power source
    Int. battery / ext. power supply
  • Battery life
    10 – 20 hours
  • Display
    Color, 320x240 pixel
  • Min. Exp. Time
    0.1 ms
  • Sensitivity
    67 nGy and 25 μGy/s
    110 nGy and 2.5 μGy/s
  • Warranty
    2 years
  • Extended Warranty
    Up to 10 years
  • Calibration Cycle
    2 years
  • Standard
    Complies with relevant parts of the standards IEC 61674 and IEC 61676 for dosimetric instruments
  • PTB Approval

Internal mAs (optional)

  • Ranges
    0.1 – 999 As
    1 mA – 930 mA
    0.01 – 999 mAs/pulse
    1 – 930 mA/pulse
  • Inaccuracy
    1 % or ±0.1 mA


  • Sampling time
    83.33 – 3000 samples/s
  • Recording time
    7–130 s

Cobia Flex Measuring Parameters

  • Tube volt.
    38 – 155 kVp (±2 %)
  • Time
    0 ms – 9999 s (±1 % or ±0.33 ms)
    3 – 9999 pulses
  • Dose
    70 nGy – 1700 Gy (±5 %)
    8 μR – 200 kR (±5 %)
  • Dose rate
    2.5 µGy/s – 175 mGy/s (±5 % or ±25 nGy/s)
    0.3 mR/s – 20 R/s (±5 % or ±2.5 μR/s)
    17 mR/min – 1200 R/min (±5 % or ±0.15 mR/min)
    1 R/h – 70 kR/h (±5 % or ±0.9 mR/h)
  • Auto Compensation
    1.0 mm Al – 1.4 mm Cu (N/A)
  • HVL
    1.2 – 14 mm Al HVL (±10 % or ±0.2 mm)
  • Total Filtration
    1.0 – 90 mm Al (±10 % or ±0.3 mm Al)
  • Pulse frequency
    1/6 – 260 Hz (±1 % or ±0.2 Hz)
  • Dose/Pulse
    10 nGy/p – 1 Gy/p (±5 %)
    1.1 µR/p – 120 R/p (±5 %)
  • Effective time
    0 ms – 9999 s (±1 % or ±0.33 ms)

Article Nr

  • Flex R/F
  • Flex R/F w. mAs



1. Do you have the latest software?
It is always good to have the latest update for your instrument. This is because we continuously fix bugs and make improvements.

2. Have you read our FAQ?
For the most common application and measurement issues, we have collected the answers in one place, please visit our FAQ page. This is so that you will get a quick answer to your question.

3. Have you checked the application notes?
In our application notes, you will find answers, solutions and tips for some specific measuring task that may arise. Here you will also find instructions on how to measure on some unusual X-ray machines and new measuring set-up.

4. Contact your local distributor
Your local representative – our extension in the world – is an expert on RTI’s products and can help you to answer your questions and support you. This way you can get help in your time zone and in your own language.

5. Contact us
We encourage you to contact us if you have questions or problems. We are here to help you and be your partner in your everyday working life.

Product configuration

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Contact Information

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Selected partners

PTB is Germany's National Metrology Institute and handles scientific and technical service tasks. With metrology as the PTB's core competence, the organisation's goal is to measure with the highest accuracy and reliability. PTB represents progress and reliability in metrology for the benefit of society, trade and industry, and science.
The ANSI National Accreditation Board (ANAB) is the largest multi-disciplinary accreditation body in North America. ANAB accredits the full spectrum of conformity assessment bodies, including calibration, testing and inspection.
The International Electrotechnical Commission (IEC) is the world’s leading organization that prepares and publishes International Standards for all electrical, electronic and related technologies.
AAPM is a scientific and professional organization, composed of more than 8000 scientists, whose primary goal is the identification and implementation of improvements in patient safety for the medical use of radiation in imaging and radiation therapy.