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MTS-32

1. DiffLok cap seals tube Diffusion locking inserts seal tubes except during the period of pumped sampling 32 Position tube manifold block s 3 g a n A e 3 MARKES international Sample tube pushes into cap Silcosteel or here Stainless steel outer body Shown transparent O Ring for sealing tube into cap Long narrow helical flow path created by pushing threaded diffusion locking insert Silcosteel or stainless steel into plain cylindrical body Figure 3 Illustration of a DiffLok cap showing the diffusion locking insert Diffusion locking inserts Sorbent beds Figure 4 Schematic of a SafeLok tube illustrating the diffusion locking inserts 3 Connecting the MTS 32 to a power supply The MTS 32 can be powered either by an integrated 12 V battery e g MTS 5009 or by 120 V 230 V electricity using a 12 V adaptor MTS 5011 This power drives both the sampling pump and the rotating pump connector plate 3 1 General battery requirements The MTS 32 can be run from any 12 V lead acid battery of sufficient capacity The mean current for operating the unit is less than 0 1 A with a similar current required to drive the pump charger With a total load of 0 2 A the 10 A h battery available from Markes International will drive the unit both MTS 32 and ACTI VOC pump for 40 hours or more This battery is fitted with standard low voltage connectors which ensure connection
2. 12 V supply does not have a means of varying the current The other output has a variable control to provide the specific current recommended by the manufacturer of the pump selected 11 s 3 g a n A e 3 MARKES international 9 User maintenance The only user changeable items are the size 010 Viton O ring seals under the O ring retaining plate See Figure 2 To access the O rings carry out the following a Remove all sorbent tubes b Remove screw on top of central rotor and remove the stainless steel pointer c Undo the four screws on the O ring retaining plate on top of the tube manifold block d Lift up the plate to give access to the O rings It is then possible to remove and replace the O rings before refitting the retaining plate and stainless steel pointer 3 g i A e 3 12 Markes International Ltd Markes International Inc Gwaun Elai Medi Science Campus 11126 D Kenwood Road Llantrisant Cincinnati RCT CF72 8XL Ohio 45242 United Kingdom USA T 44 0 1443 230935 T 866 483 5684 toll free F 44 0 1443 231531 F 513 745 0741 E enquiries markes com W www markes com 3 A company of the SCHAUENBURG International Group
3. at any time the red left hand Reset button Figure 9 is pressed the timer is stopped and reset Note when the reset button is pressed the tube position doesn t change and the pump doesn t stop Also note that if the sequence is restarted at this point i e after the Reset button has been pressed the sampling period for that tube will begin again at zero Moving the Manual switch S4 backwards causes the motor to drive the rotor round to position 32 where it will stop At this point moving the Manual switch forwards causes the rotor to move from position 32 to 1 Under normal timer operation the MTS 32 rotor stops at position 32 The sampling time for tube 32 is not set by the timer and would not normally provide valid data unless the pump is stopped manually after exactly the right sampling tube period s 3 g a i A e 3 MARKES international 7 3 Turning on the pump to begin the sampling sequence Before switching on the sampling pump work through the following checklist a Check that power is connected and that the MTS 32 is switched on b Check the pump is in place and connected power and air inlet c Check that tubes are inserted and capped with DiffLok caps if appropriate d Check that the MTS 32 rotor is set at position 1 If not follow the instructions in section 7 2 pushing the manual override switch backwards to set the rotor to position 32 then
4. pushing the same switch forwards to bring the rotor to position 1 e Check that timer settings are correct for the sampling period required 7 3 1 Turning on the ACTI VOC Switch on the pump using a pointed instrument such as a ballpoint pen to switch the ON OFF switch to the right of the pump s LCD display see ACTI VOC user manual Set the appropriate flow rate on the ACTI VOC Typical sampling rates are in the range 20 100 mL min Once the ACTI VOC mode is switched to run pumped air sample collection will begin through whichever tube is in the sampling position as indicated by the stainless steel pointer Press the green Start button to start the MTS 32 timer and ensure that the timer starts to blink approximately once per second Progress of the cycle is indicated by the bar graph on the timer LCD display see Figure 8 Note It is recommended that the pump flow rate is checked using a packed sample tube before connecting to the MTS 32 7 3 2 Turning on the FLEC Switch on the pump by pressing the button marked with an indented circle to the left of the pump LCD display see FLEC pump user manual Set the appropriate flow rate and sample time on the FLEC pump Typical sampling rates are in the range 20 100 mL min Note that the sample time should be long enough to cover the entire sequence of tubes i e not just one time period Note The FLEC pump includes delay and no of cycles settings However the
5. 1 Charger circuit for alternative constant flow sample pumps Contact Markes International before selecting or using an alternative pump for use with the MTS 32 A special cable may be required As standard pumps are only expected to run for 8 10 hours on internal batteries a continuous charge facililty has been provided To cover the wide range of pumps on the market the charge current can be varied over the range 40 to 300 mA for battery voltages from 2 8 to 12 V The required current is set by a variable resistor the circuit is shown in Figure 10 Fan Start Stop Reset 12 V 12 V Brake 10Ah Ea e resistor On off trip Microswitch 1 0 5 A 7 Microswitch 3 S1 NC jp OV External Microswitch 2 End 12V Stop optional Timer 1 W Cam operated switch microswitches On Off MOM Link FLEC pump supply pump supply Chassis heater 6 W Figure 10 Electrical schematic External optional heater The charging current is available on two outputs one for the FLEC pump and one for alternative pumps The choice of charge current must be determined from the pump manufacturer s data In general choose a value equal to the overnight charge rate from the mains powered charger supplied with the pump This is usually close to the running current and will not damage the pump battery if left connected for reasonable periods with the pump switched off The output specifically designed to run the FLEC pump which runs from a
6. 2 shows a section through the manifold block which holds up to 32 tubes The rotating pump connector plate is driven round the base of the manifold block in a clockwise direction until it is positioned in line with the tube to be sampled Air is then drawn through that tube for the selected time period before the rotating pump connector plate moves on to the next tube position The diffusive limiters on the sampling end of each of the tubes tube play a critical role both before and after the sample collection period Pumped tube Non pumped tube Sample flow q0 Eg O Ring retaining plate Ys Copper tubing to pump Pointer Rotating pump connector plate A O F ALL A Toothed pulley drives rotating Nd pump connector plate in clockwise direction O Ring seal Figure 2 Sample flow schematic Any sorbent tubes not being pumped could potentially take up analytes by diffusion or lose retained analytes by outgassing To prevent this sorbent tubes are protected using either DiffLok caps Figure 3 or SafeLok tubes with integrated diffusion locking inserts at each end Figure 4 Diffusion locking inserts are also fitted into every tube connector position in the tube manifold block Figure 2 Diffusion locking technology prevents both diffusive ingress of contaminants and loss of retained sample in every tube that is idle in the manifold block both before and after sampling
7. MARKES MTS 32 Multiple tube sampler Operator Manual QUI 1013 Version 1 3 March 2013 Markes International Ltd T 44 0 1443 230935 F 44 0 1443 231531 E enquiries markes com 3 g a i 3 MARKES international Contents 1 odU CUO AEAEE AA 3 2 Pimeiples of operati l iinan a iaraa 3 2 Principles of MIS 32 ventilatiO N assessino ae aA E TETEE 3 2 2 Principles of sorbent tube sample collection using the MTS 32 cccccssssececeeesseeeeeeesseeeeesasseeesesaaeees 4 3 Connecting the MTS 32 to a power SUPDPLY ccsesssccsnsseccensseceenseecenssecennssecnensseeeaseccenssecenssecensseeeensseenensseneons 5 3 1 General battery reQuireMent cccceccssssereescesseeeesccsseneescessaesescessarseccessaesescussaseeccassaseescasserescoassesesseas 5 3 2 Selecting the power GO HOW ssiisenesdcnstaeiaatacnetaxanssavanenideatrueiaatnendsuaatmcseuninniadedatobasnrmiacdaianmabinwndicnteauatonts 6 3 3 Powering the optional internal heaters cccccceceessssseceeeeeeeeasseeeeeeeeeeaasseeeeeeeeseaaaseeeeeeessaaaseeeeeesssnaaees 6 A Connecu ng ENS sampling POMP sasvim aiara aawa aaa iaa aaa a aoaaa aar aara iaai 7 4 1 C onnecune BEV LOC orere ue camaiek ns cecsuaanannescaae di naenennceateand eaeneeeeunauactine T 4 2 Connecting the FLEC PUMP iscrisse a Aaa ENA aa EEEE RRAN T 5 Senne the TEC srs Aa AAA AAE AAA 8 6 Sample tube insertion cccssssccsnsseccensseccenssecn
8. anumeric displays denote the number of time units required per tube e g a display of BO3OM denotes a sampling time of 30 minutes per tube Note Every sample tube in the sequence will be sampled for the same period of time except for the last tube which continues to be actively sampled until the pump is disconnected or turned off To adjust the timer settings lift one of the tabs above or below the display Once the tab is in a vertical position it can be pressed until the desired unit is displayed The tabs above the alphanumeric marked decrease the number and those below marked increase the number When each display has been set correctly move the tab back to its horizontal position 6 Sample tube insertion Whichever number of sample tubes is to be included in the sequence they should be loaded into positions 1 upwards Conditioned and capped standard sized tubes should have both caps removed and a DiffLok cap placed on the sampling grooved end The tube should then be quickly inserted in the appropriate position in the MTS 32 tube manifold block Note Tubes should be unsealed and inserted into the manifold block one tube at a time If using SafeLok tubes a DiffLok cap is not required on the sampling end Simply uncap the tubes and place into the tube manifold block s 3 g a n A e 3 MARKES international 7 Operation 7 L Turning on the power Turn on the power to the MTS 32 b
9. aters is supplied via a separate pair of shrouded sockets on the unit top over the tubes As this heater takes 1 A from the 12 V battery it has been kept completely separate from the rest of the MTS 32 circuitry and will require a separate power supply A car battery of more than 25 A h capacity will drive the heaters for 24 hours To connect the external battery to the MTS 32 an external battery adaptor lead is required MTS 5013 s 3 g a n A e 3 MARKES international 4 Connecting the sampling pump The MTS 32 is designed to operate with an ACTI VOC C LFP 01 or FLEC air sampling pump These are constant flow pumps that will deliver the same flow through tubes of different impedance Constant flow pumps from other manufacturers may be used and a general purpose pump socket is provided Figure 6 However Markes International should be consulted for advice regarding power and connection details before you connect the pump Control panel see Figure 9 12 V integrated battery if requested Socket for ACTI VOC or other pumps Socket for FLEC pump Tube manifold block Meter Figure 6 Plan view of MTS 32 inside box 4 1 Connecting the ACTI VOC Connect the power inlet of the ACTI VOC to the connection shown Figure 6 using the cable MTS 5019 Note When then the MTS 32 is switched on the level of current being supplied to the pump is shown on the gauge The variable resist
10. eseccenssecenssecensseeeennssecunssecenssecucnssecuenssecenssececnssecensssseensseeessenens 8 T Opera aE EAA E Eai 9 7 1 TOINE OMA MS NONO aa E eae ees ee 9 1 2 Summary of operation wiswasaicecetsoraprineraxtstnemeasiasiatasiierninettenneainen anes saat eee 9 1 3 Turning on the pump to begin the sampling SEQUENCE ccccsccccceseeccesseeceeuseeceaeeeeceseeeeauseeeeaeeessaaees 10 1 4 Finishing sampling oe CIC NICS acsbsenczecsnesco sce suoscedsnancuacssnncaetetuere 6cssthacecosusevenceniareaseoseuacactaacenosceswoneiees 10 5s Batter i eS aia ras sce sc cies ete aearn EEA Ei 11 8 1 Charger circuit for alternative ConStant flow sample PUMPS cccccssseeeeeeseseeeeceeaseeeeeeeeasseeesssaeeeeees 11 USS VANCE sinisini aaa aaa Eaa A ANE aa AiR aAa Aai 12 3 g i A e 3 MARKES international 1 Introduction There are many monitoring situations where it is necessary to obtain site data over periods of 24 hours or even longer Continuous on site monitoring requires a complete analytical system at each monitoring location However using an automated collection system based on thermal desorption tubes allows samples to be collected sequentially onto a series of sorbent tubes with no dead or lost time Each tube can be used to sample the air for periods of minutes to hours The MTS 32 allows sequential sampling onto a series of up to 32 industry standard sized sorbent tubes It is a self contained unit powered either using an
11. integrated rechargeable 12 V battery or normal 120 V 230 V supply using an appropriate 12 V adaptor Caution Although the MTS 32 is contained within a shower proof box it should be protected from extreme weather conditions if outdoor sampling is to be carried out The unit should preferably be located above ground level 2 Principles of operation 2 1 Principles of MTS 32 ventilation The sampling system is housed in a tough low emitting polymer box with a polycarbonate sealed lid Air is drawn over the sampling end of the sorbent tubes by means of a fan and air intake duct The air inlet and outlet ports are fitted with a fine wire gauze to keep out insects The same housing incorporates the 12 V supply socket for use if the MTS 32 is to be battery powered The fan is a 12 V low speed long life unit using minimal current from the battery At 12 V the fan throughput is about 1 L per second which is enough to change the air over the sampling ends of the sorbent tubes more than 10 times per minute The general arrangement is shown in Figure 1 Insect barrier Heater gauze optional Ambient air in Exhaust air Fan 12 V battery Main air flow 1 L s gt 10 changes min Secondary air flow approx 1 change min Figure 1 Cross section of MTS 32 indicating air flow s 3 g a n A e 3 MARKES international 2 2 Principles of sorbent tube sample collection using the MTS 32 Figure
12. narrow solid jack plug that powers the fan 3 2 2 Powering the MTS 32 using the integrated 12 V battery option If the MTS 32 is to be used with the integrated battery option MTS 5009 ensure that the male jack plug from the battery is connected to the right hand socket labelled Battery Power in on the MTS 32 control panel 3 2 3 Connecting the MTS 32 to an external 12 V battery If the MTS 32 is to be connected to an external 12 V battery the external battery adaptor lead MTS 5013 must be connected to the right hand side military grade socket on the lid of the box Figure 5 This connection is directly above the fan and air outlet Ensure that the male jack plug connector leading from the fan outlet is connected to the left hand external power in socket on the MTS 32 control panel see Figure 9 Do not confuse this with the narrow solid jack plug that powers the fan 3 3 Powering the optional internal heaters To prevent internal condensation under foggy or 100 humidity conditions a heater is suspended from the underside of the air inlet and another is bolted to the main chassis If required these must be run from an independent 12 V power supply connected to the left hand military grade socket on top of the MTS 32 lid see Figure 5 The heater supplies 12 W which will raise the temperature of the inlet air by about 10 C This also enables the unit to run at ambient temperatures below 5 C Note Power for these he
13. or should be adjusted to show no more than 100 mA This can be done by turning the dial Figure 7 anti clockwise Figure 7 Variable resistor dial Connect the ACTI VOC pump air inlet to the s copper tubing shown in Figure 2 Place the pump on the right hand side of the box on top of the integrated battery if present Note The back pressure adaptor supplied with the ACTI VOC should not be used with the MTS 32 4 2 Connecting the FLEC pump Connect the power inlet of the FLEC pump to the connection shown see Figure 6 3 g a i 3 MARKES international Note When then the MTS 32 is switched on the level of current being supplied to the pump is shown on the gauge The variable resistor is only adjusted if the MTS 32 is being used with an ACTI VOC or alternative pump Connect the FLEC pump air inlet to the 1s copper tubing shown in Figure 2 Place the pump on the right hand side of the box on top of the integrated battery if present 5 Setting the timer As shown in Figure 8 the left hand alphanumeric display denotes the mode of operation of the timer This should always be set to B The far right hand alphanumeric display denotes the unit of time ranging from 0 1 s to 10 h LCD Display Index Tabs Lift tab into upright position and push down to alter settings Timer operating mode Set time Time units always set to B Figure 8 Timer display The middle three alph
14. se are not applicable to MTS 32 operation so these should be set to zero Once the FLEC pump mode is switched to run See manual pumped air sample collection will begin through whichever tube is in the sampling position as indicated by the stainless steel pointer Press the green Start button to start the MTS 32 timer and ensure that the timer starts to blink approximately once per second Progress of the cycle is indicated by the bar graph on the timer LCD display See Figure 8 Note It is recommended that the pump flow rate is checked using a packed sample tube before connecting to the MTS 32 Note The current being drawn by the pump displayed on the meter see Figure 6 will vary depending on the FLEC pump pulse rate This in turn will vary depending on the tube impedance and required sample flow rate 7 4 Finishing sampling sequence The cycle will continue through all loaded tubes up to position 32 regardless of the number of tubes loaded into the MTS 32 UNLESS stopped by the operator before this point Pressing the on off switch will stop power to the whole unit thus stopping the timer pump connector plate rotor and the pump itself At the end of the cycle remove each tube in turn and replace the storage caps firmly 3 g i A e 3 10 MARKES international 8 Battery charging If the system is to be re used immediately replace the battery pack with one that is fully charged 8
15. with the correct polarity Since the battery is sealed it MUST be charged from a high quality constant voltage charger A suitable charger is available from Markes International MTS 5010 Because this charger is in effect a voltage controlled power unit it can also be used directly to drive the MTS 32 from mains electricity for indoor or test purposes The charger is NOT suitable for outside use If desired a higher capacity 12 V car battery can be used for which a simple connecting lead is available MTS 5013 This would enable the MTS 32 to run for longer than 40 hours The MTS 32 is protected against reverse polarity connection by a diode inside the unit s 3 g a n A e 3 MARKES international 3 2 Selecting the power option 3 2 1 Connecting the MTS 32 to a 120 V 230 V electricity supply If the MTS 32 is to be connected to a 120 V 230 V power supply the mains adaptor MTS 5011 must be connected to the right hand side military grade socket on the lid of the box Figure 5 This connection is directly above the fan and air outlet D External power j aioli supply connection pow mh y external battery or connection 120 V 230 V 7 adaptor Figure 5 Plan view of MTS 32 lid of box Ensure that the male jack plug connector leading from the fan outlet is connected to the left hand external power in socket on the MTS 32 control panel see Figure 9 Do not confuse this with the
16. y pressing the black on off switch on the control panel Figure 9 The motor driving the rotor may operate at this point depending on its previous status Press the red reset button on the control panel to ensure that the timer is in Standby mode The LCD display should read off and the display should not blink External power in Battery power in Fan Timer module see Figure 8 On Off switch Stop reset Start Manual override switch 84 Figure 9 Control panel schematic Push the manual switch away from the front of the box This will cause the rotor to move to the final position 32 and then stop 7 2 Summary of operation At switch on or after pressing the Reset button the timer is in the reset state and nothing happens At the beginning of the intended run move the Manual override toggle switch S4 Figure 9 forwards to bring tube 1 into the sampling position The sampling position is indicated by the steel pointer on the rotor shaft Operating the green Start button will cause the time to start counting down This is shown by a flashing signal on the timer LCD If a sample tube is in position 1 and the pump is connected air will then be drawn into tube 1 for the allotted sampling time After the preset time the motor drives the rotating pump connector plate under the tubes until the pump connector is located under tube position 2 This process is repeated in sequence up to tube position 32 If

MTS-32

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