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Sun Nuclear Electronic Continuous Radon Monitor (91027CRM)

Model #: 91027CRM
This item No Longer Available.  eMail sales at for additional information or replacement product advice.

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Category Radon Gas Testing

We highly recommend the Radstar RS-300, which has greater accuracy.

Link to the RADSTAR RS-300

Sun Nuclear Accuracy is 75% vs Radstar accuracy 90%

The following links, images and information remain available for informational purposes only.

Our professional Continuous Radon Monitor is classified as a Continuous Radon Monitor (CRM) testing device, and has been evaluated and accepted by the US EPA for use in real estate transaction testing.

The Model 91027 provides both a digital display of the measured value as well as a report that may be obtained from either a printer or a computer. PC software, suitable for printing reports, is included with the instrument. A compact printer (P/N 020030) that plugs into the 91027 Monitor is available if an on-site report is required. (Data is stored in the Radon Monitor and can be printed at a later time.)

The Model 91027 is operated using line power (110 VAC). The instrument contains a 9 volt battery which provides backup power in the event of a power outage during a test. The Professional Continuous Radon Monitor employs internal sensors to detect and report movement during a test. The testing is not interrupted if tampering is detected, but the tampering is noted on the final report. The Model 91027 does not contain any replaceable or “consumable” parts. The instrument is completely reusable; simply clear the memory and it is ready for a new test.

  • Power Supply: Transformer converts 120 VAC to 12 VDC. Optional 220 VAC power supply available.
  • Sensitivity: 2.5 counts per hour per PicoCurie per liter (pCi/L).
  • Measurement Range: 0.1 to 999 (pCi/L).
  • Operating Range: 45 to 95° F
  • Accuracy: ±25% or 1 pCi/L, whichever is greater after 24 hours.
  • Detector: Diffused-junction photodiode.
  • Measurement Intervals: 1 hour
  • Data Port: RS-232 9 pin D connector allows printer data to be sent to PC
  • Battery Backup: One 9 V alkaline battery supplies 24 hour operation. LED low battery indicator
  • Tilt Switch: Disturbance Detector
  • Weight: 2 lbs
  • Size: 8" x 4.7" x 2.5"
  • Display: 3 digit LED display
  • Displayed Values:
    • Long-term average- Accumulates until device is reset.
    • Short-term average- rolling 12 hour average
  • Key Lock: Inhibits tampering with the device.

Supplied with:

  • radon monitor
  • Serial cable
  • Windows® Software PC software (Note: Using the radon software with newer laptops will possibly require a USB to Serial adapter cable)
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Category Radon Gas Testing
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