User manual
Contents
1. MARKES Qu 000 Version 6 3 September 2013 User manual TC 20 Sample conditioning and dry purge rig Markes International Ltd cs T 44 0 1443 230935 F 44 0 1443 231531 E enquiries markes com A company of the SCHAUENBURG International Group www markes com QUI OO03 Page 2 Contents 1 Introduction to the TC 20 ccssccssssssscenssenseenseeesseseennes 3 1 1 Tube CONCITIONING cccceseececceeesseeeeeeessseeeeeeeaeeees 3 1 2 DIY DULSING ce ccccccccssseeeeeeeasseeeceeeeaseeeeeeeaseeesessageees 3 2 Required services 11scenscensseesseenseenseeessesseosseonseenssenssenaes 4 Duke POWE SUDD y asirna 4 2 2 Supply of clean carrier gaS ccccccssssseeeeeeesesseeeeees 4 3 Prior to operation sssssssunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nan 5 3 1 Attachment of cooling Plate ecccescesssseeeeeeeees 5 3 2 Important notes relating to operation c0 5 4 Operating instructions ccsscesssnscenseessenseensenssensenssenes 6 4 1 Gas supply quick release UNION ccccsseeeeesseeeeeeeeees 6 4 2 Temperature control cccccssssscssssssecsssseesscensenceeens T 4 3 Digital timer CONTIOI ccseeceecccseeseeeeeccesseeeeecees 8 5 Service and general maintenance s ssssss2s2222521 8 5 1 Trip reset procedure ssesssesesnerennnrrnnnrrnnnnnrrnnnrrnnnerrnnne 8 5 2 Charcoal filter replacement Procedure2. e Do not block or cover the rear of the unit and allow at least 200 mm of clear space to the rear of the instrument Note that the TC 20 emits approximately 250 W of heat when set at 400 C Only operate the TC 20 in a well ventilated area e On reaching the end of the run time keep the TC 20 and carrier gas flow switched on and place the manifold in the cooling plate To avoid contamination of the clean tubes remove them from the TC 20 as soon as they are cool enough to be handled Reduction of the carrier gas pressure to 5 psi during the cooling process will also reduce the risk of contamination Note that it is important to keep the fan running while the TC 20 is hot e Operate with care at all times remember some parts of the TC 20 reach high temperatures Observe normal good laboratory practice at all times Markes International Ltd T 44 0 1443 230935 F 44 0 1443 231531 E enquiries markes com www markes com QUI O003 Page 6 4 Operating instructions 1 2 10 4 1 Hold manifold assembly or place in a suitable position whilst inserting tubes For tube conditioning push the non grooved end of the sorbent tubes to be conditioned into the manifold block with the sampling grooved ends pointing outwards Any number of the 20 tube positions may be left empty if required For dry purging follow the instructions as for conditioning but insert the tubes into the manifold assembly grooved end first i e wit
3. Application Note TDTS 5 Markes International Ltd T 44 0 1443 230935 F 44 0 1443 231531 E enquiries markes com www markes com QUI 0003 Page 11 7 Recommended dry purge programmes 1 Set the carrier flow to approximately 50 mL min 2 Either leave the temperature switched off or set it to a low temperature i e just above ambient temperature 35 40 C 3 Set the time run for about 10 20 min Trademarks SulfiCaro and TC 20 are trademarks of Markes International Ltd UK Carbosieve is a trademark of Supelco Inc USA Carboxen is a trademark of Supelco Inc USA Chromosorb is a registered trademark of Manville Corporation USA Tenax is a registered trademark of Buchem B V The Netherlands Markes International Ltd T 44 0 1443 230935 F 44 0 1443 231531 E enquiries markes com www markes com
4. artefact formation it is advisable to wait until the main heater block inside the TC 20 is reading below 100 C before loading a fresh batch of tubes Pull steadily to remove the tubes from the manifold assembly If necessary rotation of the tubes will aid removal Gas supply quick release union The manifold assembly and tubing is attached to the TC 20 via a quick release union Figure 3 The union can be disconnected leaving the gas supply to the TC 20 sealed so that the manifold assembly can be removed if required for ease of inserting removing tubes Retractable body sleeve BOUE vH Figure 3 Quick release union Markes International Ltd T 44 0 1443 230935 F 44 0 1443 231531 E enquiries markes com www markes com QUI O003 Page To attach the manifold assembly and tubing to the TC 20 1 Align the stem with the body 2 Pull the body sleeve down and firmly insert the stem body until it bottoms out 3 Release the sleeve 4 The sleeve should return to its original position To detach the manifold assembly and tubing from the TC 20 5 Pull the body sleeve down 6 Remove the stem from the body 4 2 Temperature control The TC 20 can operate between 50 C to 400 C using the temperature controller Figure 4 Figure 4 Temperature controller To select an operating temperature between 50 C and 400 C 1 Press lt P gt SP 1 should be displayed flashing on the top line of the disp
5. ccceeeee 9 6 Recommendations for successful conditioning 10 6 1 Recommended conditioning programmes 10 7 Recommended dry purge programmes s1sccssseessenssenees 11 Markes International Ltd T 44 0 1443 230935 F 44 0 1443 231531 E enquiries markes com www markes com QUI O003 Page 3 1 Introduction to the TC 20 The TC 20 may be used as a sorbent tube conditioning rig to clean sorbent tubes prior to sampling or as a dry purge rig to remove water from sampled tubes prior to analysis 1 1 Tube conditioning It is essential that tubes are carefully conditioned before they are used for sample collection Conditioning parameters should be more stringent than those to be used for Subsequent analysis Typically tubes are conditioned at 10 C below the maximum safe temperature of the least stable sorbent in the tube Extra care should be taken when conditioning carbonised molecular sieve type sorbents to ensure that all oxygen is eliminated from the tube before sorbent temperatures are allowed to exceed 250 C More details of recommended tube conditioning parameters are given in Application Notes TDTS 5 and TDTS 19 available at www markes com After conditioning a representative number of the cleaned tubes usually 1 in 10 should be desorbed under analytical conditions to check artefact levels Individual artefacts peaks on the blank chromatogram should be no more than 1 ng in toluene
6. equivalents for Tenax and below 10 ng toluene equivalents for other porous polymer sorbents Artefact levels can be reduced to below O 1 ng after stringent conditioning for most carbon sorbents NOTE It is advisable to keep a record of blank chromatograms for individual tubes or series of tubes so that trends in artefact levels can be monitored 1 2 Dry purging Dry purging is used to remove excess water from sorbent tubes particularly when hydrophilic sorbents such as Carboxen 1000 and Carbosieve SIII have been used After sampling clean dry carrier gas is passed through the tube in the sampling direction i e with gas arriving at the grooved end of the tube first For example if mixed bed universal tubes which contain Tenax a graphitised carbon black and a carbonised molecular sieve are purged in this direction at a flow rate of approximately 50 mL min for 10 20 min the level of water found on the tube is significantly reduced This helps to avoid potential difficulties with GC detectors such as mass selective detectors FIDs and ECDs where a large amount of water can adversely affect the detector In addition to this it extends the column lifetime Markes International Ltd T 44 0 1443 230935 F 44 0 1443 231531 E enquiries markes com www markes com QUI O003 Page 4 2 Required services 2 1 Power supply TC 20 requires either 240 V or a 120 V power supply The voltage requirements for your unit ar
7. spring holding the filters in the assembly and replace and remove old filters Place two new filters in the assembly and replace the spring ensuring that it is clipped securely Oo Oo FB W N Place the fan supply leads in the unit and replace the fan assembly being careful not to trap the fan supply leads N Replace the four screws removed in step 2 above 8 Replace the mains power lead and the gas connection if removed gt DENOTES AIR FLOW THROUGH CASE STATIC SEALS 20 TUBE MANIFOLD BLOCK QUICK RELEASE WITH FLOW RESTRICTORS 1 8 COUPLING FILTER PRESSURE N GAUGE M S OUT 20 TUBE HEATER BLOCK NoIN VIA RESTRICTO 1 8 PTFE TUBING Figure 6 TC 20 gas flow schematic Markes International Ltd T 44 0 1443 230935 F 44 0 1443 231531 E enquiries markes com www markes com QUI O003 Page 10 6 Recommendations for successful conditioning e The carrier gas supply should be either high purity helium or high purity nitrogen The recommended gas purity is 5N Depending on the quality of the gas supply it may be necessary to use in line filters to remove trace levels of oxygen moisture and hydrocarbons Markes International recommend the use of the following filters o Disposable indicating oxygen trap Part number C O2TRP o Refillable hydrocarbon trap Part number C HCTRP o Refillable glass moisture trap Part number C MSTRP e Always ensure that there is carrier gas supply to the unit prior to
8. e indicated on the serial number plate at the back of the instrument Figure 2 2 2 Supply of clean carrier gas Markes recommends the use of clean dry nitrogen or helium It is strongly recommended that a large capacity hydrocarbon filter is installed in the carrier gas line as close to the TC 20 as possible to remove any trace level hydrocarbons from the carrier gas Figure 1 Front view of TC 20 Figure 2 Rear view of TC 20 Markes International Ltd T 44 0 1443 230935 F 44 0 1443 231531 E enquiries markes com www markes com QUI 0003 Page 5 3 Prior to operation Prior to using the TC 20 for the first time we recommend that the unit is operated overnight for 6 8 hours ata temperature of 350 C with carrier gas flowing through the unit If possible this should be carried out using 20 empty tubes in situ This will ensure that the TC 20 associated connections and gas lines are scrupulously clean following shipping and installation 3 1 Attachment of cooling plate The cooling plate is packed separately to the TC 20 and supplied with two screws for attachment to the top plate of the TC 20 Use the screws supplied and a posi drive screwdriver to attach the plate as shown in Figure 1 3 2 Important notes relating to operation Please read these notes BEFORE operating the TC 20 e Ensure that the top manifold is always in the TC 20 except when loading tubes to keep the temperatures as equalised as possible
9. h the non grooved end pointing outwards Using the handle guide the assembly down into the heater block The tubes should slot easily into the heater block If there is any resistance do not force the block down Set the required temperature for the conditioning programme see Section 4 2 Set the required time for the conditioning dry purging programme see Section 4 3 NOTE At the start of the run the timer will commence and the heaters will switch on Remember to extend the tube conditioning time to take account of the TC 20 warm up time if necessary Switch on the carrier gas to the unit and adjust to the relevant pressure see Section 6 for further information Press the lt U gt button on the timer see Section 4 3 To stop the TC 20 at any time during its programme press the lt U gt button on the timer Remember that it will take some time for the TC 20 to cool down to ambient temperature When the programme is complete or is aborted leave the tubes in the heater block with the carrier gas flowing and the TC 20 switched on Remove the manifold assembly and place it on the cooling plate Remove the tubes from the manifold block as soon as they are cool enough to handle Reduction of the carrier gas flow during the cooling process to 5 psi will reduce the risk of contamination Do not switch off the carrier gas flow until the tubes have cooled sufficiently to comfortably handle them NOTE To extend sorbent lifetime and avoid
10. lay CAUTION If the lt P gt key is pressed for longer than 2 seconds the display will show PASS If this happens press lt P gt again before repeating step 1 Do not attempt to make any changes if PASS is displayed 2 Use the Up or Down arrow keys to set the required temperature 3 When the required temperature set point is displayed press lt P gt to confirm the new set point The display should revert to the normal operating mode within 10 seconds Markes International Ltd T 44 0 1443 230935 F 44 0 1443 231531 E enquiries markes com www markes com QUI O003 Page 8 4 3 Digital timer control The TC 20 run time can be set from 1 minute to 99 hours 59 minutes using the timer controller Figure 5 Figure 5 Timer controller To adjust the setting between 1 minute and 99 hours 59 minutes 1 Press lt P gt t1 should appear on the display whilst the key is pressed and the SET CNT indicator at the top left of the timer will flash 2 Use the Up or Down arrows to set the required time 3 Press and release U for display to revert to the normal running mode The controller will revert to this display if no buttons are pressed for 10 seconds 5 Service and general maintenance 5 1 Trip reset procedure If the heat generated by the TC 20 does not dissipate sufficiently quickly and as a result the internal temperature exceeds 150 C for any period of time the trip switch is acti
11. starting the conditioning programme e Always ensure that there is sufficient carrier gas supply for the conditioning time chosen NOTE The TC 20 will consume 900 mL min of carrier gas 45 mL tube connection point at 15 psi see Table 1 e Atthe end of the conditioning programme the unit will start to cool down Ensure that the flow of carrier gas to the tubes is maintained until they have cooled back down fully to ambient temperature Pressure psi Flow rate mL min Table 1 Flow rate versus pressure approximate 6 1 Recommended conditioning programmes Freshly packed Tenax 2 hours at 320 C with 50 100 mL min carrier gas flow followed by 30 min at 335 C with 50 100 mL min carrier gas flow Freshly packed Chromosorb 106 2 hours at 220 C with 50 100 mL min carrier gas flow followed by 30 min at 230 C with 50 100 mL min carrier gas flow Freshly packed SulfiCarb 1 hour at 100 C 1 hour at 200 C 1 hour at 300 C and 30 min at 380 C with 50 100 mL min carrier gas flow Previously used tubes For tubes which are not freshly packed i e those that have been used previously but need cleaning for future sampling the final time and temperature given above will be sufficient For example used Tenax tubes may be reconditioned at 335 C for 30 min NOTE For tubes which are to be used for trace level analysis additional conditioning may be required Further information on tube conditioning is given in Markes
12. vated To avoid injury allow the unit to cool before resetting as follows 1 Switch off unit and remove the mains power lead It is not necessary to remove the gas connection if the rear of the unit can be freely accessed Remove the four larger M4 screws securing the fan assembly Figure 2 Withdraw the fan assembly It is not necessary to remove the fan supply lead The red reset button is now accessible inside the unit Push to reset O A W N Place the fan supply leads in the unit and replace the fan assembly being careful not to trap the fan supply leads O Replace the four screws removed in Step 2 T Replace the mains power lead and the gas connection if removed Markes International Ltd T 44 0 1443 230935 F 44 0 1443 231531 E enquiries markes com www markes com QUI O003 Page 9 5 2 Charcoal filter replacement procedure Charcoal filters are positioned in front of the fan to trap the VOCs removed from the sorbent tubes This ensures that the VOCs do not contaminate the laboratory air See Figure 6 Replacement filters are available in packs of four part number R FLTR4 1 Switch off unit and remove the mains power lead It is not necessary to remove the gas connection if the rear of the unit can be freely accessed Remove the four larger M4 screws securing the fan assembly Figure 2 Withdraw the fan assembly It is not necessary to remove the fan supply lead Unclip the
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