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Gas chromatography (GC) is a common type of chromatography used in analytical chemistry for separating and analyzing compounds that can be vaporized without decomposition. Typical uses of GC include testing the purity of a particular substance, or separating the different components of a mixture. In preparative chromatography, GC can be used to prepare pure compounds from a mixture.Gas chromatography is also sometimes known as vapor-phase chromatography (VPC), or gas–liquid partition chromatography (GLPC). These alternative names, as well as their respective abbreviations, are frequently used in scientific literature.Gas chromatography is the process of separating compounds in a mixture by injecting a gaseous or liquid sample into a mobile phase, typically called the carrier gas, and passing the gas through a stationary phase. The mobile phase is usually an inert gas or an unreactive gas such as helium, argon, nitrogen or hydrogen. The stationary phase is a microscopic layer of viscous liquid on a surface of solid particles on an inert solid support inside a piece of glass or metal tubing called a column. The surface of the solid particles may also act as the stationary phase in some columns. The glass or metal column through which the gas phase passes is located in an oven where the temperature of the gas can be controlled and the eluent coming off the column is monitored by a computerized detector.

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  1. J

    Gas rating an appliance

    Hi apologies of this has been asked before but when you gas rate an appliance and trying to compare to the technical data, do you go off the Domestic hot water input as that’s a higher figure than the central heating max? Thanks
  2. J

    High meter operating pressure and low gas rate

    Hi just been to check a family members boiler and I’m getting just over 25mbar working pressure at the meter and 22mbar inlet pressure at the boiler. Standing pressure is 29mbar and done a tightness test and that is all fine. Also did a gas rate and it’s only only showing as 22kw and the boiler...
  3. M

    High gas rate on SIME Format HE. Possible cause?

    Anyone familiar with servicing SIME Format 30HE? I had to shut down a boiler today as it was using far too much gas and I was unable to identify the fault. The CO readings were totally fine but the gas rate was coming in at around 38kW. Has anyone come across this before or have any idea what...
  4. M

    Cant gas rate new boiler

    Just fitted a new boiler for customer have gone to gas rate when commissioning and batteries are dead in gas meter. Gas supplier won’t come out until 6th Jan. Does anyone have any ideas what I can do? Customer obviously needs heating and hot water over Christmas
  5. M

    Low gas rate on Worcester Greenstar Junior 28i

    Hoping someone can give me advice with this one. At an annual gas service today I found a Worcester Greenstar Junior 28i to be using only running at around 12kW on high when carrying out the gas rate. The CO readings were where they should be, fan speed was okay and inlet working pressure was...
  6. K

    Gas rate heat input breakdown

    Hi do we need to do a gas rate or heat input when doing a boiler breakdown? Thanks
    • Kidkad
    • Thread
    • america breakdown gas gas rate heat heat input input usa
    • Replies: 1
    • Forum: USA
  7. M

    Glow Worm burner cycling on Pmax when trying to gas rate

    Hi I am gas safe registered, when commissioning glow worm Ultimate 3. Have put into p.01 to gas rate and set at Pmax, but burner keeps cycling on and off rather than running at full rate, so am getting incorrect gas rate, any thoughts?
  8. H

    Heat Input Gas Hob

    Hi, Just started doing my gas course and we went through on my course the calc for gas rates and working out heat input etc. I have just done a gas rate on my hob and it seems there is a discrepancy of 1 between my reading and the MI. Assuming the heat input figure in the MI is always in...
    • hayati
    • Thread
    • america gas gas hob gas rate heat heat input hob input usa
    • Replies: 2
    • Forum: USA
  9. C

    Help me please- gas rate

    If gas rate fails would this be done to burner pressure? If not what would be cause?
  10. J

    Gas Rate Advice please

    Hi all, I am currently in the process of completing my Gas portfolio and have just started to complete some installs. I have a question regarding gas rate/heat input on a Glow worm Energy 12r which I am currently installing. I would like to know which Kw figure I use to compare my calculated...
  11. D

    Ideal logic 30 low gas rate

    Ideal logic plus 30 kw, gas rated at 21 kw net on hit water. Inlet pressure 21mb at boiler, flow rate 12 lit pm, temp 40.3 degrees. Have checked, gas valve, injectir internal boiler pipework for blockages. Fga readings fine, boiler gas rate on central heating 23.5 kw net, service mode gas rate...
  12. J

    Gas Rate eco tec sustain

    looking at the manual for an Eco Tec Sustain and the gas rate is in two sections, one for H gas and one for P gas. Can someone explain what H and P is ? I feel like this is something obvious I know but I have a mind blank :confused:
  13. J

    Eurometers E6 SC - How to gas rate

    Hi All, Some wisdom, please How do you gas rate these little meters? Google brings up nothing and I couldn't see anything in the Tech Bulletins. Cheers, J
  14. gingalig

    Ultracom 38cxi Gas rate, gas flow on and off

    I hope it's ok, being posted here, I just did a gas rate on an Gloworm ultracom 38cxi, I put it into service mode Hi, and ran the hot tap in the kitchen, The meter was a metric and I timed for 2 mins, The flow of gas at the meter stopped, all be it briefly and then re-started twice during the...
  15. Savva

    Gas Rate/ Heat input....why so important?

    Hi all I'm being asked to do more & more GSR's and want to develop my understanding of WHY heat inputs/ gas rates are so important. With a flueless appliance like a HOB, where the POC's fill the room, it's obvious why the app needs to burn the correct amount of gas. But for a room sealed app...
  16. moonlight

    How do you gas rate an appliance with a new smart meter?

    I haven't had to do one as yet. Two LGSC recently and they had new meters, just would like to know before I have too. Thanks.
  17. Inverness

    Gas rate on a flonidan G4 gas meter

    upcoming meters how do we do a gas rate on them?
  18. D

    How to Gas Rate Smart Meters

    hi all. Hopefully someone can help I did see something in gas installers mag last year and lost it. How do I gas rate smart meters. Specifically the 'Secure' ones used by 'OVO'. TIA
  19. G

    Chronos Gas Rate Calculation software is now free.

    Due to popular demand, we've created a free, ad-supported version of our Chronos Swiss Army Knife software. Carry out gas rate calculations, calculate BTU/Kwh for a room. Save your gas rate calculations for review later. This app used to cost £1.99, now we're giving it away for free. There's a...
  20. sammathias

    Vailliant ecotec pro 28 low gas rate

    Alright guys, just a quick one. Fitted a vailliant ecotec pro 28 today and upon commissioning the gas rate was slightly lower than 10% of the nominal, which baffled me because ive probably fitted 20 of these boilers and they have all been within range. All of my other checks where fine so i was...
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