Model 3100 Portable Tritium in Air Monitor

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The Model 3100 Tritium in Air Monitor features ruggedized and flexible operation. It may be powered by either 115 Vac, 50/60 Hz or by rechargeable internal NiMH batteries. It features a maintenance-free diaphragm air pump to pull air through the 250 cc tritium chamber, and the air flow is measured internally with a mass-air flow sensor. A second 250 cc chamber is used to provide gamma compensation, allowing operation in higher gamma fields. Other internal sensors measure temperature and ambient pressure and provide compensation for these effects.


  • No Zero Adjust Control Needed
  • Easily Calibrated with 137Cs Gamma Range
  • Temperature and Altitude Compensation
  • “Check Mode” Self-Test Feature Determines Instrument State of Health
  • Digital Backlit Display with Status, Airflow Readout, and Diagnostic Information
  • Purge Mode to Dry Ion Chamber
  • Internal Chamber with Replaceable Desiccant
  • Passed USA Military Tests Including: MIL-STD-810G, MIL-STD-461G, MIL-STD-901D, MIL-STD-1399-300B
  • Readout in µCi/m3 or MBq/m3

The heart of the tritium detection is the sealed electrometer chamber, using the latest low-noise electrometer chip. This electrometer can reliably measure the femtoamperes of current resulting from tritium within the chamber and does not require the user to adjust an offset or zero knob. The pixelated digital display provides feedback on the tritium concentration, as well as showing status on several important conditions: temperature, pressure, power, airflow, chamber bias, and alarm or failure status.

The Model 3100 is easy to use, having only a few simple controls, and can be used while wearing gloves. A clear window allows the user to see the condition of the desiccant in the integrated desiccant chamber. A toggle switch allows the user to put the desiccant chamber in-line to the incoming air. The instrument comes in a rugged hard-shell commercial case with wall-mounting brackets. The Model 3100 has passed USA military testing for RF susceptibility and emission, shock and vibration, temperature and blowing rain, as well as other tests.

Ludlum Medical Physics is part of Ludlum Measurements Inc. They focus on radiation safety and medical imaging QA. Their unique product line is fully focused on fulfilling the needs of medical physics....