Operating principle

The Mercury Instruments Automatic Calibration Unit consists of a specially designed mercury vessel containing elemental mercury of high purity, surrounded by an aluminium jacket cooled by a thermoelectric cooler. For automatic calibration a motor driven syringe extracts a defined volume of mercury saturated gas and feeds it to the UT-3000 Ultratracer.

The UT‘s microprocessor calculates the mercury concentration from temperature and volume of the calibration gas.

The temperature within the mercury vessel is measured by a high precision electronic sensor (PT 100).