Model 3102 Series

Portable Tritium in Air Monitor

Features

• 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
• Internal Heater Element Purge Mode to Dry Ion Chamber (with 12 V Input)
• Readout in µCi/m³ or MBq/m³

The Model 3102 Series Tritium in Air Monitors feature ruggedized and flexible operation. Two versions are available: the Model 3102/O (orange label), which has a faster response time and a resolution of 10 μCi/m³, and the Model 3102/B (blue label), which has a threshold and resolution down to 1 μCi/m³ but a slower response time. Each monitor features a maintenance-free diaphragm air pump to pull air through the 250 cc tritium chamber; 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.

The heart of the tritium detection is the sealed electrometer chamber, using the latest low-noise electrometer chip. This electrometer can reliably measure 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 3102 Series are easy to use, having only a few simple controls, and can be used while wearing gloves. Both have a large, easy-to-read display with a backlight control for increasing contrast in low-light conditions. In addition to the tritium level, the display simultaneously shows the user the battery/power condition, the temperature, the pressure, the status condition, and the airflow through the chamber. Power is provided via alkaline AA batteries or a +12 Vdc power supply.

The Model 3102 Series are built for ruggedness and reliability. Two airflow pumps were tested and shown to last over 10,000 hours of continuous use. The Model 3102 Series share many of the characteristics and design of the Model 3100, which was built and tested for the U.S. military. Testing was done in accordance with ANSI N42.30, MIL-STD-810G, MIL-STD-461G, MIL-STD-901D, and MIL-STD-1399-300B standards which test instrument operation under various conditions including temperature, blowing rain, salt fog, vibration, mechanical shock, RF susceptibility, and RF emissions. The commercial user of the Model 3102 Series benefits from this design and testing history.

Versions