Operating instructions

4. Calibration page 35
Mercury Instruments UT-3000-E_V2.11.docx 31.07.12
Analytical Technologies
On a third page the parameters of the
calibration function are displayed.
The main menu is displayed again after the calibration mode is left.
Practical recommendations for performing a calibration:
Mercury masses should be within the same range like the measuring range. Static calibration
sources (= mercury filled bottles with headspace) deliver calibration gas with comparatively high
mercury concentrations (ca. 12 - 14 pg/µl at room temperature). For a low measuring range of 0.1
to 10 ng/m³ the mercury masses injected should be ideally from 1 pg to 100 pg. However,
1 pg will be difficult to apply as this would require at room temperature a very small volume (0.1
µl) which is not practical. In practice, volumes from 1 µl to 100 µl will be used.
 Use the syringe delivered with the Static Calibration Set or alternatively a syringe with
a capillary length of 50-52 mm ! Do not use a syringe with a different capillary length !
How to calculate the mercury mass ?
Read the temperature of the mercury calibration bottle as exactly as possible.
Determine the mercury concentration from either the table which usually comes together with the
calibration device or from below calculation formula.
Calculation of mercury saturation concentration in headspace after equilibration:
where: A= 3216522.61
B= 8.134459741
C= 3240.871534
T= absolute temperature (= Temperature in °C + 273.2)
From the mercury concentration calculate the mass of mercury which is in the volume which
shall be injected. For example, if the mercury concentration of the calibration gas is
16.700 µl/l, one µl contains 16.7 pg Hg and 10 µl will contain 167 pg Hg.