Nuclear Services Group > Tyne Engineering Website

Stack Monitors

Model: 7022


Stack monitors are used to assess presence of tritium in the exhaust ducting or plant exhaust stack. They may be used in nuclear power stations, laboratories, fusion facilities, and research facilities. Tritium stack monitoring takes many forms depending on client requirements.

Where a tritium stack monitor is intended for regulatory compliance, two characteristics distinguish it from an area monitor:

  • the total flow must be known even though the instrument may only measure tritium per unit area. This means that the flow through the stack must be measured and equated to the tritium per unit area measurement;

  • for compliance coverage, measurement must take place at all times so coverage must be provided even during instrument maintenance outages.

  • If stack flow measurement is required, the stack must have been profiled according to its shape, distances from bends or valves etc., and assurance available that samples taken are representative of the full stack profile. If this is not already available it will have to be provided as part of a tritium stack monitoring system. A Client may wish to know not only how much tritium is exhausted from a facility but also what form it takes, ie whether it is elemental tritium or HTO. Such an instrument is called a discriminating monitor. Other Clients may wish monitors to perform additional functions such as particulate and iodine measurement in addition to tritium (PIT Monitor). Other designs are available such as those performing real time measurements recording peaks of tritium release using ion chambers, or measurement of total tritium over a wide period with bubblers and scintillation counting. Please contact us to discuss your particular needs.


    • Custom designed/built instruments to Client's requirements.

    • Control system to integrate with Client's systems

    • Proven equipment to minimize uncertainty in new designs,

    • Tritium stack monitors

    • Tritium area monitors

    • Duct measurement equipment

    • Standard parts will minimize spare parts inventory


    Tyne has designed a new tritium controller unit which is operated through a touch sensitive screen. One of the advantages of this unit is that it includes a series of built in relays which can be used for valve and other equipment control which make the unit very flexible to use in a variety of stack and area monitor designs using the same unit but modifying the computer program by which it operates. Used together with three ion chambers, a large wire cage three liter chamber, a smaller but well proven 1 liter solid chamber and a high level 10 cc wire cage chamber provides us with great flexibility in area monitor and stack monitor design. Some examples of stack monitors made by Tyne are shown below.

    Computer-controlled stack monitors can be provided, with options of permanent computer read out, and monthly or continuous collection

    Stack monitor internals

    Tyne's flow measurements are controlled via sensitive mass flow controllers and meters; Tyne will provide calibration curves, operating and maintenance manuals, and other documentation required by the purchaser.

    Temporary Mobile Stack monitor

    Tyne will design and build to its ISO 9001-2000 program.

    Stack analysis equipment