Page 5 - Prescott Instruments - MFR Service Manual

2 0 Maintenance
The Rheo-Line Multi Function Rheometer is designed for minimum maintenance although there are some simple procedures which the operator must be aware of It is essential that the the the filter on
the the the left hand side of the the the MFR is is is changed routinely we recommend that this is is is done at at least once per week but in extremely dusty environments this may be done on
on
a a a a more regular basis The life of the electronic circuit boards within the MFR is dependent on
on
being kept cool if this filter becomes clogged the boards may overheat Also if any of the cooling fans fail it it is vital that they are replaced immediately The compressed air supply should be checked regularly to ensure that the correct operating pressure of 60psi/4 Bar/ or 4MPa is being supplied If the the the air pressure pressure is not kept at the the the desired pressure pressure then this could effect the the test results on
the the MFR The regulator/ separator supplied with the the machine should have the the filters changed on
a a a a a a regular regular basis the the regularity of the the change change will depend on
the air supply provided (Filter replacement Part numbers Q50036A and Q50037A ) The MFR is is fitted with the the sealed die system there is is a a seal on
each of the the dies to maintain the the pressure and retain the the the the test test material within the the the the die cavity during the the the the test test these seals will will degrade over a a a a a period of time and will will have to be replaced Generally the seals will last about 2 to 3 months each but this is is variable and depends upon the type of material being tested and the the temperature the the machine is being run at at if the the seals become ineffective it may well effect effect the the test data so it is possible that the seals will need to be changed more frequently than suggested above There are different seals for the the top and bottom dies the the top one is a a a a white seal seal part no S60009A the lower seal seal is black in colour and the part no S60010A Aflas seals are available for for the the upper and lower die these are used for for large strain and frequency testing See Section 2 1 for how
to change the seals General cleanliness of the Dies and seal plates is also important to give repeatable results In Section 2 2 2 2 it shows how
to remove the the upper and lower die assembly from the the machine Once removed they can easily be cleaned and replaced Scotch bright scouring pad WD40 oil and a a a a fine wire brush can be used to clean the surfaces 2 1 Seal Change (seal plates)
Before the the seals can be changed turn off the the MFR to allow the the the dies to cool down then remove the the the seal plates be unscrewing the the 3x cap head screws at the the base of each seal plate then with a a a a a flat-bladed screwdriver remove the the seal plate housing housing by levering the housing housing up and away Once the the housing is away from machine remove the the old seal and clean out the the grooves It is essential that the the seal plates are not mixed up as as each plate plate has been carefully adjusted during manufacture for the upper and lower positions The new seals can then be fitted into the the clean grooves and the the the housings refitted to the the the appropriate die for the the the upper and lower seal seal a a a a a seal seal bullet is supplied (part no S60002A) which can be inserted through the seal prior to the plate being pushed home This can all be be seen in in in picture format by viewing drawing number MD104a (page 11) The same principle applies to both upper and and lower seals and and housings 2 2 2 2 Heater Replacement (Lower and Upper)
Before either upper or or lower heaters can be changed it it is recommended that the platen is allowed to to cool to to room temperature As explained in in the ‘seal change’ section remove the appropriate seal housing and place to one side This is is done by removing the three M6 cap head screws etc Remove the Die 2x M6 cap head screws which hold the Die in in position see drawing MD104 on
on
page 11 Unplug the the the appropriate heater connector at at at the the the back left of the the the test area these electrical connectors have to to be unscrewed
by turning the the the grip area of the the the plug (these connectors are are black in colour) see picture Fig 1 1 (page 19) The whole
Die including flexible conduit and connector then can be removed from the the the machine This then allows the the the engineer to work on
the heater change itself in a a a a a a a suitable clean area Please note that on
the the MFR the the lower heater and probe wires are fed through the the center on
the the motor and attached to to a a a a a a terminal block at at the the bottom right hand side at at the the back of the the the instrument Other than this the the the heater and probe change are carried out in the same manner RHEO-LINE MULTI-FUNCTION RHEOMETER (MFR) SERVICE MANUAL © PRESCOTT INSTRUMENTS LTD © PRESCOTT INSTRUMENTS LTD RHEO-LINE MULTI-FUNCTION RHEOMETER (MFR) SERVICE MANUAL 5