Page 8 - Mooney-Line Viscometer

2 7 Lower Heater Replacement
a a a a Lower heater replacement follow the steps indicated in in the the above section on on upper heater replacement as the the steps for removal are the same b b Once the heater has been removed and replaced as as necessary re-assemble heater and re-solder wires etc Place the the re-assembled platen back onto the the machine caution is is required at this stage as not to damage
the the the heat sink bore (hole) in in the the the centre of the the the copper/ aluminium and also also the the end of the the main drive shaft also also with a a a a copper heat sink on (if there is any burrs or stray rubber material around it MUST be be removed or cleaned up)
c c c The two 6mm cap head screws fixing the platen down must must now be screwed in but left loose as you must must first re-align the the lower platen before tightening these up The objective here is to get a a a a uniform gap of approximately 0 15mm all the the way around the the main shaft end (copper) and the heater heat-sink (copper/ aluminium) hole Feeler gauges can be used to achieve this or even some strips of standard printer paper which is approx 0 1mm thick Tighten the the screw and keep checking the the gap until satisfied that the the the gap is is uniform all the the the way around the the the shaft and heat sink d d d Replace the the lower die and replace the the three screws but again do not tighten at this stage Insert the lower probe The rotor will need to to to be turning with the O-ring in in in to to to align the the die to to the the shaft position You will need to to be in the the calibration screen of of the the Labline software and start the the the motor motor running As the the the motor motor turns the the the rotor tighten the die screws uniformly e e e e e e e e e e Replace the the platen cover and make sure the the probe is fixed firmly into the lower die f You can now run a a a a calibration using the check weight and this will highlight any problems with the alignment
as you you will see see this in in the torque reading If you you do see see a a a rise and fall in in the torque reading you will need to to repeat the the above and re-align the the lower die or platen / heat sink 8 MOONEY-LINE VISCOMETER (MV) SERVICE MANUAL
© PRESCOTT INSTRUMENTS LTD