10.536 MERCURY VAPOUR GENERATOR
The Mercury Vapour Generator is a calibration device for mercury analysers.
It operates on the principle of diluting a saturated source of mercury at known temperature.
A low flowrate is passed across the mercury reservoir ensuring that the gas becomes saturated with mercury. The gas saturated with mercury is then diluted into the concentration range of interest. The flowrates are controlled using two mass flowcontrollers.
The unit also generates a Hg free zero span so that blank measurements can be performed.
The system is capable of providing a wide range of Hg concentrations by varying the mass flow controller and oven set-points (e.g.100ng/m3 to 3000 µg/m3).
The unit has been used for numerous applications such as online calibrations, sampling system bias checks, spiking sample streams and for bench studies were precise concentrations of mercury are required.
Theoretical Versus Measured Response from Calibration System
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