Features:

• Continuous Tritium Air/Stack Monitoring
• Optional Totalizer feature for automatically computing total tritium release using stack flow rate
• Fully integrated CPU with touch-screen display, onboard data logging, and graphing
• Total tritium (HT + HTO) or HTO only measurement (C-14/noble gas compensation)
• Two tritium level alarms (alert and high), malfunction alarm, and low flow alarm included
• Coaxial gamma compensation and alpha pulse suppression (radon rejection)
• Visual alarm indicators for tritium level, low flow, and malfunction
• NEMA-4/IP-66 carbon steel wall-mount enclosure for proper protection
• Long-term zero stable, span calibration is permanently stable due to special electrometer design
• Seismically qualified to IEE STD. 323-1974 and IEE STD. 344-1975 for nuclear power generating stations
• EMC qualified to MIL-STD-461E CE101, MIL-STD-461E CE102, and MIL-STD-461E RE102

Description:

The Model Triathalon-H₃ is a single-range ionization chamber tritium in air monitor housed in a NEMA-4 wall-mount enclosure designed for stack or room monitoring applications.  This smart instrument includes a microprocessor, color LCD touch-screen display, and on-board datalogging and graphing.  Coaxial gamma compensation and radon rejection decreases background to negligible levels.  The touch-screen display allows you to adjust units of measurement, alarm limits, and flow rate for totalizing among other parameters, as well as view historical graphs of the data.  The alarm system includes two adjustable tritium level alarms (alert level and high level), as well as malfunction alarm indicators for low flow and low/high voltage power supply failure.  Level alarms can be configured for latching or non-latching operation.  Alarm relays for the two level alarms and malfunction alarm are included.

A quick and easy change in hose connections allows the user to measure either total tritium (HT + HTO) or HTO only through use of a desiccant column to compensate for C-14, noble gases, or other radionuclides.

The NEMA-4/IP-66 carbon steel wall-mount enclosure is designed for continuous long-term duty and offers superior protection.  The door is hinged to allow servicing of components, and also includes a lock with key to prevent unauthorized access.  External sample connections are 3/8″ O.D. stainless steel Swagelok fittings.

An optional totalizer feature can be included which automatically computes the total tritium release up the stack or effluent by multiplying the stack flow rate (manual or dynamic rate from existing stack flow sensor) by the measured tritium concentration.  The Triathalon-H₃ is a cost-effective tritium effluent monitor that is compact, lightweight, and includes an easy wall-mount configuration.

The only maintenance required for the Triathalon-H₃ is periodic service of the pump and replacement of the dust filter.  The sensitivity, accuracy, and noise level of the Model Triathalon-H₃ is superior to competitive instrumentation by an order of magnitude.

Calibration of the Triathalon-H₃ tritium monitor can be accomplished by three different methods:

1. Tritium gas calibration: Injecting tritium gas into the ionization chambers to produce an accurately predictable concentration and adjusting the calibration potentiometer accordingly. Overhoff offers factory calibration services and also provides tritium gas calibrators for the customer to calibrate on-site.
2. Gamma calibration using a gamma source: Using a certified gamma range or source, tritium monitors can be calibrated using the relationship 1mR/hr yields the same ionization current as 90 µCi/m³ of tritium.
3. Electrical equivalence method: All Overhoff ionization chamber – electrometer modules carry a BNC receptacle to which a precisely calibrated ultra-high resistor can be attached. Using Ohm’s law and knowing the volume of the ion chamber, you can calculate the current value and expected panel meter display and adjust the calibration potentiometer as required.  Calibration resistors are available for purchase.