Operating instructions

8. Version for Hg determination in natural gas and other hydrocarbon gases (Tedlar®
Bag Version) page 85
Mercury Instruments UT-3000-E_V2.11.docx 31.07.12
Analytical Technologies
8.3.1 Setup of the UT-3000 analyzer
Safety instructions – read carefully:
Place the UT-3000 onto a flat and dry surface (table). Take care that
the ventilation holes on the bottom side of the analyzer are not
covered by objects (like a sheet of paper, etc.) and air can free
ventilate. This is important that in case of an internal leakage of the
analyzer no explosive atmosphere can form inside the analyzer.
During sample aspiration into the analyzer flammable gas will blow
out from the gas outlet fitting on the rear side of the analyzer. Take
care that the gas which comes out from this fitting is led to a well
ventilated place without any ignition sources. It must be avoided that
this gas can accumulate in closed volumes. If necessary use small
tubing (ID 4 mm) to guide the gas away from the analyzer to a well
ventilated place. Do not use a tubing which is longer than 5 meters to
avoid accumulation of explosive gas inside the tubing.
It is a precondition that the instrument has been properly calibrated as described in chapter 4.
The sample volume has to be set at a value which is smaller than the volume which has been
filled into the sample bag.
Standard setting is 0.1 to 1 liter, depending on the expected concentration. For higher
concentrations the sample volume has to be set smaller, for lower concentrations the sample
volume should be higher, see table. To set the sample volume press F2 from the main menu (see
also chapter 3.4.1).
T ABLE : SAMPLE VOLUME SETTINGS FOR DIFFERENT CONCENTRATION RANGES
According to the composition of the sample gas the built-in flow meter is automatically
calibrated before each measurement in order in order to achieve the correct sample volume.
Concentration range Sample Volume Cycle Duration
0.001 µg/m3 – 0.5 µg/m³ 10.0 liter 17.5 min
0.002 µg/m³ - 1 µg/m³ 5.0 liter 10 min
0.01 µg/m³ - 5 µg/m³ 1.0 liter 4 min
0.02 µg/m³ - 10 µg/m³ 0.5 liter 3.3 min
0.05 µg/m³ - 25 µg/m³ 0.2 liter 3 min
0.1 µg/m³ - 50 µg/m³ 0.1 liter 3 min
> 50 µg/m³
0.01 liter 3 min