Du Pont 943 TMA Operator'S Manual Download Page 21 | Manualshive

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Summary of Contents for 943 TMA

Page 1: ...943 TMA Thermomechanical Analyzer Operator s Manual REG U S PAT s TM OfF...

Page 2: ...al Analyzers Instrument Systems Operator s Manual 943 Thermomechanical Analyzer Du Po nt Company Instrument Systems Concord Plaza Quillen Building Wilmington OE 19898 PN 943145 000 Rev F Issued April...

Page 3: ...INTRODOCTION...

Page 4: ...lm powder or fiber is compressed or held in tension by a probe assembly Movement of the probe is translated electrically by a linear variable differential transformer LYDT attached to the probe into a...

Page 5: ...Contains the LVDT for measuring vertical movement probe assembly lnterchangeable for making several different measurements Holds a weight tray for loading weights onto the sampIe Positioned vertically...

Page 6: ...ameter by 1 9 Load mm ln kPa 0 Penetration Probe 0 89 0 035 16 D Expansion Probe 2 54 0 100 1 9 l1Macro Expansion 6 07 0 239 0 34 Probe Optional probe assemblies are described in the appendix to this...

Page 7: ...INSTALLATION...

Page 8: ...nectors on the front of the TMA cabinet If necessary loosen the setscrews in the Dewar cap with the Allen wrench supplied in the accessory kit Turn the Dewar cap until the hole faces the thermocouple...

Page 9: ...CONNECT THERMOCOUPLE YELLOW LEAD TO LOWER JACK COLOR CODE LOCATION SAMPLE HOLDER TUBE THERMOCOUPLE DETAIL A THERMOCOUPLE INSTALLATION PROBE NYLON WASHER PROBE POTSHIT0 NBSCREW CONTROL HEAD ASSEMBLY T...

Page 10: ...as shown on page 7 r NOTE UPPER SHAFT ASSEMBLY MACRO PROBE 4179C 943 8 11 Replace the bearing guide and the retaining nut 12 Tap the top of the probe assembly gently to make sure that it moves freely...

Page 11: ...alignment by looking down into the head assembly and observing the gap be tween the lower bearing and the probe Ifthe probe appears to be touching the side of the head assembly rotate it until the ga...

Page 12: ...OPERATION...

Page 13: ...tion Procedures Routine Operating Sequence Subambient Operation Specific instructions for operating the TMA with each of the optional accessories appear in the appendix of the rnanual beginning on pag...

Page 14: ...min 5 Probe Position Control Thumbscrew The position control thumbscrew is used to raise or lower the probe for positioning on the sampie 6 Transducer Position Control Thumbscrew This contral adjusts...

Page 15: ...ol reference junction is used to cali brate the control thermocouple 10 Sampie Reference Junction The sampie reference junction is used to cali brate the sampie thermocouple 11 Derivative Zero This sc...

Page 16: ...r does not touch the sampIe holder If it does adjust the heater as folIows a Vertical Adjustment CAOTION When performing this adjustment hold the support arm rigid to prevent the arm from breaking at...

Page 17: ...8 943 28 b Horizontal Adjustment To adjust the support arm horizontally loosen the adjustment tab locknut and screw the tab in or out as needed Tighten the locknut NOTE 3 Attach the heater to the Dewa...

Page 18: ...LLATION CAOTION The Dewar flask seals will melt at temperatures above 500 C To install the Dewar flask tilt the flask and slip it over the heater Then while holding the Dewar cap in one hand screw the...

Page 19: ...Make the final adjustment of the probe assembly at a temperature below that of the low est transition expected in the material under investigation SampIes for penetration and expansion should be as t...

Page 20: ...from ambient to desired upper limit 7 If the baseline deviates from the horizontal more than 2 5 cm adjust the BASELINE control on the front of the TMA to bring the pen back toward the center of the...

Page 21: ...obe position control so that the probe just rests on the empty sample holder platform 4 Place a 5 9 weight from the accessory kit on top of the weight tray 5 Set the DISPLAYAXIS to read signal 3 on th...

Page 22: ...itioned as a line zero reference point 1 cm above the bottom grid line of the chart paper Release the ZERO switch NOTE When ZERO switch is released the pen will change its position 13 Adjust the TMA t...

Page 23: ...cerned with this calibration unless you are interested in the analog derivative signal signal 5 To perform this procedure on the 1090 use the DISPLAY AXIS to zero the electrical signal The TMA s deriv...

Page 24: ...e TMA is adjusted Rotate the screwdrtver adjustable potentiometer clock wise to move the pen down Adjust this zero to coincide with the previously set recorder zero 5 Observe the movement of the Yaxis...

Page 25: ...I on the Y curve Drop a verticalline to intersect a horizontalline drawn from P3 to P2 10 Measure line segments PIP2 and P2P3 Substitute these values into the relationship Yt 20 PtP2 P2P3 11 Measure t...

Page 26: ...SAMPLE RANGE mV ern RANGE mV ern MODE DAMPING mV cm ____ ATM HEAT_COOL_ISO __ WEIGHT mg RANGE mV ern OSCAMP mm FLOWRATE SHIFT cm REFERENCE SAMPLESIZE A ZGAIN Ofo TIME min cm LOAO g SAMPLESIZE 0 r IT...

Page 27: ...transducer position control and the displayaxis 9 Set up a thermal run from arnbient to 300 C at 10 C min Prepare to store the run t 10 Start the calibration run Then press and hold the RESET switch...

Page 28: ...L 0 coefficient of expansion inJ Lm moC J Lin in C ETMA static calibration coefficient 1 J Lm mV 103 J L in min in 0 Where L sampIe length in m in L change in sampIe length in cm of chart T change in...

Page 29: ...OF PHYSICS HANDBOOK 2nd edition 4 66 1963 T rn rnoC llin in C aC 73 20 0 23 21 9 27 23 2 77 24 1 127 24 9 227 26 4 327 28 3 427 30 7 527 33 8 r NOTE 5 Apply the ealibration standard alurninurn eylind...

Page 30: ...C min _ 50 mK mV SUPPRESSION mg _ RANGE mV cm _ WEIGHT mg _ MOOE RANGE De em _____lO________ I RANGE mV cm _ DSC DTA 200 IlW mV TGA DTG 50 Ilg mV 50 I g Cmln mV TMA DTM ATM_ u _ FLOW RATE _ HEAT __ CO...

Page 31: ...asurement of derivative Where Metrie example 8 1 em 2 mV ern 0 1 f Lm min mV 21 2 f Lm moC 10 C min 7 62 x 10 3m 1 Apply the ealibration standard aluminum eylinder length measurement to equation 2 as...

Page 32: ...erimental value for the Y axis previously recorded from equation 1 step 9 The experimental value previously from our example was 21 2 jJ m m C 3 Solve equation 3 to determine the dynamic calibration c...

Page 33: ...with optional heater When an experiment requires heating from subambient temperatures perform the fol lowing steps CAOTION 1 Remove the TMA Dewar flask and heater assembly 2 Prepare the TMA with a wei...

Page 34: ...to the heater to maintain the initial temperature 12 Remove the heater from the liquid nitrogen empty any liquid from the heater weil and attach the heater to the Dewar cap 13 Remove liquid nitrogen f...

Page 35: ...MAINTENANCE...

Page 36: ...nd should be handled carefully Clean the bearing guides as folIows 1 Remove the weight tray Dewar flask and heater assembly 2 Disconnect the thermocouple leads and remove the Dewar cap with the sample...

Page 37: ...ore and the upper probe with Freon TF spray or with acetone applied with a soft brush or cloth 2 Clean residue from the end of the quartz probe by heating it with a Bunsen burner until the residue eva...

Page 38: ...leads are properly aligned with the hole in the Dewar cap for easy removal NOTE 4 Holding the sarnple holder tube in one hand insert a hook which can be fashioned out of a piece of stiffwire into the...

Page 39: ...o the bottom of the sample holder tube SPRING CLIP 4 7 lA 94 3f THERMOCOUPLE TIP 3 Hold the thermocouple in position and insert the hook into the top of the sarnple holder tube Pull the spring clip up...

Page 40: ...through the hole in the side ofthe Dewar cap 6 Replace the Dewar cap 7 Connect the red thermocouple lead to the upper jack on the TMA and the yellow lead to the lower jack CONNECT THERMOCOUPLE RED LEA...

Page 41: ...PARTS LIST...

Page 42: ...PARTS LIST...

Page 43: ...ON WASHER UPPER BEARING GUIDE UPPER SHAFT ASSEMBL Y PENETRATION PROBE ASSEMBL Y Lower Shaft Assembly EXPANSION PROBE ASSEMBLY Lower Shaft Assembly MACRO EXPANSION ASSEMBLY Lower Shaft Assernbly SAMPLE...

Page 44: ...5 7 9 6 8 10 1 I 12 13 15 17 Exploded Vi ew 943 System Parts List l 8179A 943 38 43...

Page 45: ...older Assembly Vial of Cleaved Aluminum Balls FIBER TENSION SPECTROMETER ACCESSORY KIT Load Cell Carrier Load Cell Adapter Load Cell Weight Tray Load Cell Assembly Low Range Fiber Tension Lower Probe...

Page 46: ...METER ACCESSORY KIT Rheometer Shaft Assembly 2 Rheometer Sarnple Holder Assembly 2 Rheometer Sample Forming Die Set Pellet Press Pellet Press Cylinder Pellet Press Cylinder Head Pellet Press Piston Pe...

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