Operating instructions

8. Version for Hg determination in natural gas and other hydrocarbon gases (Tedlar®
Bag Version) page 84
Mercury Instruments UT-3000-E_V2.11.docx 31.07.12
Analytical Technologies
8.3 UT-3000 version for analysis using a sample bag (Tedlar® Bag)
NOTE: the Tedlar Bag Method described in this chapter requires the corresponding
software which is installed as an option. The Tedlar Bag Method has to be activated in the
Service Menu by entering the Code 191 (see also Chapter 5.10).
The bag sampling technique offers a simple, low cost and yet precise method to determine the
mercury concentration in natural gas (or other gas samples).
A suitable sample bag (3 liters or 5 liters Tedlar® bag, available as an accessory) is filled with
the gas sample. The valve of the bag is closed (observe the instructions of the sample bag) and
the bag is transported to the UT-3000 analyzer which has been set up at a safe place.
If flammable gases are filled into the sample bag extreme care has to
be taken that the bag does not come into contact with hot surfaces,
sparks, open fire etc. which could cause ignition of the bag. Severe
physical or material damages could occur. Never use sample bags
which are damaged or may leak ! It has also strictly to be avoided that
air or oxygen can enter the sample bag. This could lead to the
formation of an explosive gas mixture. The bag has to be emptied
completely before filling with new sample. Do not store filled sample
bags in badly aerated rooms. Empty the sample bag after use
observing safety precautions for flammable gases.
F IGURE : CONNECTING A
SAMPLE FILLED T EDLAR
BAG TO THE UT-3000
SAMPLE INLET