Ac­cu­rate mois­ture anal­yser for nat­u­ral gas

DEMM Engineering & Manufacturing - - OIL & GAS -­quiry #141217

Michell In­stru­ments has launched its lat­est mois­ture anal­yser for nat­u­ral gas – the Op­tiPEAK TDL600.

Us­ing tune­able diode laser spec­troscopy (TDLAS) tech­nol­ogy, the an­a­lyzer of­fers a class-lead­ing ac­cu­racy with a lower de­tec­tion limit of less than 1ppmV. While TDLAS tech­nol­ogy has been used for some time to mea­sure mois­ture in nat­u­ral gas, the Op­tiPEAK TDL600 is the first of a new gen­er­a­tion of anal­y­sers that over­comes the lim­i­ta­tions of older mod­els cur­rently on the mar­ket.

Be­cause TDLAS mois­ture anal­y­sers mea­sure the re­ac­tion of mol­e­cules to spe­cific fre­quen­cies of light, changes in the back­ground com­po­si­tion of the gas usu­ally re­quires that the anal­yser is ad­justed to main­tain its ac­cu­racy.

Sci­en­tists in Michell’s re­search depart­ment have de­vel­oped the Dy­namic Meth­ane Com­pen­sa­tion Sys­tem (D-MET) to over­come this prob­lem. With D-MET, the Op­tiPEAK TDL600 is able to mea­sure mois­ture re­li­ably in nat­u­ral gas with vary­ing com­po­si­tions (such as blended gas from mul­ti­ple fields or fol­low­ing bio-meth­ane or re-gasi­fied LNG in­jec­tion) with­out the need for man­ual soft­ware cor­rec­tion fac­tors to be made.

With in­creas­ing statu­tory re­quire­ments in many re­gions for bio- meth­ane to be added to gas dis­tri­bu­tion net­works, the anal­yser al­ready meets th­ese new pa­ram­e­ters.

Tak­ing ad­van­tage of the lat­est de­vel­op­ments in laser spec­troscopy, the Op­tiPEAK TDL600 has an un­ri­valled ac­cu­racy for any process mois­ture an­a­lyzer of ±1 per­cent of the read­ing or 1ppmV. Its lower de­tec­tion limit of 1ppmV makes it the most sen­si­tive in­stru­ment in its class on the mar­ket, as well as be­ing one of the most re­li­able.

Michell has de­vel­oped a laser lock sys­tem which au­to­mat­i­cally mon­i­tors the op­ti­cal pro­file of the gas ab­sorp­tion peaks to en­sure the laser re­mains locked to the cor­rect wa­ter ab­sorp­tion sig­nal, main­tain­ing a high in­tegrity mea­sure­ment at all times. In ex­ist­ing TDLAS mod­els on the mar­ket, laser drift re­sults in a re­duc­tion of sen­si­tiv­ity.

The Op­tiPEAK TDL600 pro­vides a fast re­sponse be­cause the op­ti­cal mea­sure­ment tech­nol­ogy is non-con­tact. This means there are no wet-up or dry-down times – mea­sure­ments can be made im­me­di­ately. Plus none of the sens­ing com­po­nents are sub­jected to the gas stream, pro­tect­ing them from ag­gres­sive com­pounds and harm­ful con­tam­i­na­tion.

Cal­i­brated trace­able to NPL (UK) and NIST (US), the anal­yser also has world­wide hazardous area cer­ti­fi­ca­tion, in­clud­ing ATEX, IECEx, cMETus, TC TR Ex.

The Op­tiPEAK has also been de­signed for min­i­mum cost of own­er­ship. With an in­te­grated sam­pling sys­tem and small foot­print, it can eas­ily be retro­fit­ted in to ex­ist­ing plant in­fra­struc­ture. Due to the in­her­ent sta­bil­ity of the in­stru­ment, reg­u­lar field cal­i­bra­tion is not re­quired un­der nor­mal op­er­at­ing con­di­tions. The anal­yser will per­form re­li­ably for many years with just ba­sic main­te­nance and house­keep­ing.

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