They are intended for use as verification tools for certification of thermoelectric thermometers in air or neutral environment in the temperature range of 300 ... 1200 °?
in laboratory conditions.
For the 1st category thermometers the temperature range is 300...1100 °?.
Probability of failure-free operation is not less than 0.90 for 500 hours at temperature 1100 °?;
average service life - not less than 6 years.
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