False Pneumatic Control Accessories General purpose backing pneumatics for TD operation ( U- GAS01) TD equipmentp 63typically requires a supply of high purity carrier gas ( usually helium) and a supply of dry gas ( either dry air or nitrogen) to operate. U- GAS01 controls both these gas supplies immediately up-stream of the TD system. It consists of a high quality ( stainless steel) regulator and 0- 60 psi gauge for control of the carrier gas and a standard regulator and 0- 100 psi gauge for control of the dry gas. Both lines also have on/ off toggle valves. Markes strongly recommend that every UNITY ( series 1 or 2) platform thermal desorber is configured with a U- GAS01 pneumatic control accessory. General pupose backing pneumatics - U- GAS01 Carrier gas backing pneumatic accessory for some TDaccessoriesp 63& applications ( U- GAS03) U- GAS03 consists of one high quality ( stainless steel) regulator, a 0 - 60 psi gauge and an on/ off toggle valve. U- GAS03 is recommended for use in the following configurations. • controlling purge gas supply on an ULTRA( 1 or 2) autosampler with ISDP accessory • regulating the pressure of the internal standard ( IS) gas supplying CIA8 or ULTRA- ISDPif no other appropriate regulation is supplied • controlling the supply gas to the Microchamber/ Thermal extractorp 37 or TC- 20p 35 Helium Leak Detector Accurate, sensitive and rapid detection of carrier gas leaks in a thermal desorption - gas chromatography system is essential for troubleshooting. Traditional “ wet” methods of leak detection using soap solution should be avoided, as this can lead to contamination of the gas lines and TD flow path. Markes offers a portable, highly sensitive leak detector designed to detect helium ( or hydrogen) leaks in TD- GC systems. It works on thermal conductivity principles and is sufficiently sensitive to detect leaks < 0.01 mL/ min. Gas leaks are indicated via an LED display and a buzzer. The detector uses re- chargeable batteries and is supplied with the relevant mains powered battery charger. Flowmeter Markes offers a solid state digital flowmeter1for measuring TDgas flows e. g. split flow, desorb flow, etc. It provides measurement of eight gases: air, argon, argon/ 5% methane, carbon dioxide, helium, hydrogen, nitrogen and oxygen, within a range of 0.1 to 500 mL/ min. Resolution is 0.1 mL/ min and accuracy is typically better than ± 2.5%. Calibration is traceable to the UK National Physical Laboratory ( NPL) standards and an annual re- calibration service is offered on a “ return to factory” basis. 1. CSi 6000 - Cambridge Scientific Instruments DescriptionPart Number Helium leak detector including 220VchargerC- HEL23 Helium leak detector including 110 V chargerC- HEL11 Digital flowmeterC- FLMTR Recalibration service for digital flowmeter ( return to Markes) C- FLCAL DescriptionPart Number Dual regulator ( dry gas/ carrier gas) pneumatics accessory U- GAS01 Single regulator ( high purity gas) pneumatics accessory U- GAS03 72 WW:: wwwwww.. mmaarrkkeess.- cuosma. comT: + 1 T( 8: 8+ 64) 4 4 ( 803) 51648443 ( 2U3S0A93to5 ll free) E: enquiries@ markes. com Laboratory Accessories

False Gas purifiers Markes strongly recommends the use of carrier gas purifiers upstream of the analytical system to remove hydrocarbons, oxygen and water. General purpose purifiers are available for standard TD- GC( MS) operation and high capacity purifiers for specialised applications. Hydrocarbon Trap The hydrocarbontrap is suitable for the removal of C3+ hydrocarbons in helium, hydrogen, nitrogen, argon/ methane and air. Refill kits are also available. The trap has a maximum flow capacity of 2L/ min and the stated life is 16 cylinders1. Molecular Sieve 5ÅWater Vapour Trap Molecular Sieve 5Å efficiently removes water from helium, hydrogen, nitrogen, air etc. A refill kit is available. The trap has a maximum flow capacity of 2L/ min and the stated life is 68 cylinders1. Oxygen/ Water Trap This trap reduces O2levels to less than 2 ppb2. It can extract contaminating oxygen at 10 ppm from at least three 8.5 m3cylinders and the maximum flow capacity is 250 ml/ min. High Capacity Helium Purifier Removes O2, H2O, hydrocarbons, CO2 and CO from helium, giving an output gas which is 99.99999% pure. Maximum flow capacity is 8 L/ min and the stated life is 13 standard cylinders2of 99.999% helium. High Capacity Gas Purifier This specialised purifier removes both O2and H2O from any common carrier gas ( except hydrogen) via a catalytic reaction. It can purify up to 60 tanks of heavily contaminated gas containing 100 ppm O2 and/ or H2O at flow rates of up to 1.1L/ min. A pressure gauge should be fitted at the outlet to monitor the pressure drop across the purifier - when the drop exceeds 10 psi the purifier tube should be replaced. Replacement purifier tubes are available. Miscellaneous Supplies Syringes Markes offer a selection of syringes4, for both liquid and gas injections. 1 µL liquid syringe. A 1 µL plunger- in- needle syringe fitted with a repeating adaptor provides ± 2% accuracy and reproducibility for injection volumes down to 0.1 µL. 5 µL liquid syringe A5 µL plunger- in- barrel syringe provides ± 1% accuracy and reproducibility for injection volumes between 1 and 5 µL. 50 mL & 100 mL gas syringes 50 mL and 100 mL removeable luer lock gas tight syringes are available, providing ± 1% accuracy and reproducibility for injection volumes down to 10 mL. Maximum gas temperature is 120° C. 4. Supplied by SGE DescriptionPart Number Gas purifier, hydrocarbon, 120 cc, 1/ 8” fittings C- HCTRP Gas purifier, hydrocarbon, refill materialC- RFHCT Gas purifier, moisture, 200 cc, 1/ 8” fittingsC- MSTRP Gas purifier, moisture, refill materialC- RFMST Gas purifier, oxygen/ water 120 cc, 1/ 8” fittings C- O2TRP Gas purifier, helium purifier, 1/ 8” fittings C- HEPUR Gas purifier, high capacity, 230 V, 1/ 8” fittings C- HCP23 Gas purifier, high capacity, 110 V, 1/ 8” fittings C- HCP11 Gas purifier, high capacity, replacement purifier tube, 1/ 8” fittings C- HCPTB Gas purifier, high capacity, replacement element, 230 V C- HCE23 Gas purifier, high capacity, replacement element, 110 V C- HCE11 Gas purifier, high capacity, outlet pressure gauge C- HCPPG 1. Based on std 218 cubic feet cylinder containing 50 ppm contaminants 2. When the level in the incoming gas does not exceed 10 ppm 73 WW:: wwwwww.. mmaarrkkeess.- cuosma. comT: + 1 T( 8: 8+ 64) 4 4 ( 803) 51648443 ( 2U3S0A93to5 ll free) E: enquiries@ markes. com Laboratory Accessories