Operating instructions

8. Version for Hg determination in natural gas and other hydrocarbon gases (Tedlar®
Bag Version) page 83
Mercury Instruments UT-3000-E_V2.11.docx 31.07.12
Analytical Technologies
F IGURE : S AMPLING C ONTINUOUS SAMPLING OF NATURAL GAS
(B ENCHAMAS O FFSHORE P LATFORM ; T HAILAND )
8.2 Setup for continuous measurement of Hg in natural gas
For automatic 24 hours per day monitoring an optional setup for continuous measurement is
available. The analyser system is installed in a safe place out of the hazardous zone. The sample
is extracted from the gas pipeline with a heated sampling system (described under 8.1. The
sample is then guided to the analyser through a stainless steel/Teflon (PFA) capillary. The
analyser is purged with air to avoid formation of an explosive atmosphere in case of leakage. In
addition a built in gas sensor shuts the system down and stops the sample gas flow by closing a
valve which is installed in the sample line.