Magnum Venus Plastech Megaject RTM Pro Revison 7_0 - Manual (Page 16)

Megaject RTM Pro Manual – Revision 7.00 – 13
th
APRIL 2006
Next, place the injection nozzle into a suitable test cup
Press START button and pump approximately 0.2 litres into the test cup and then
press STOP. DO NOT STIR!
The injection head must then be flushed. Direct the injection nozzle into a safe waste
container. Press the FLUSH button and allow the machine to complete it’s
solvent/air flush cycle.
Ensure that the resin in the test cup is suitably catalysed and that the mixture gels as
expected for the resin system in use.
2.6. Pump calibration
The Megaject RTM Pro gives the user the facility to enter a calibration value to adjust
how the volume of delivered resin is calculated, based upon the volume of liquid per
stroke.
The volume of resin is generally referred to, when injecting components, and is the
reference volume used for manual and automatic injections. However, it must be
remembered that the volume of fluid being delivered through the mixing head also
includes the volume of catalyst. However, in most cases the quantity of catalyst can
be considered to be negligible. For example, if 2 litres of resin is dispensed during
calibration tests, with a catalyst ratio of 2%, a theoretical volume of 2040 millilitres
would be dispensed. The accuracy of the machine is at best +/-100 millilitres, and
therefore it is acceptable to ignore the catalyst percentage in the resin volume
calculation.
To calibrate the machine, please refer to sections 3.9 and 3.10. Use the 2 litre bucket
example in section 3.9 as a starting point for machine calibration.
It is advised that the operator performs the following steps to calibrate the machine:
1. Set up the “2 litre bucket” example recipe.
2. Perform an automatic injection into a sample container using this recipe.
Please remember to have a suitable waste container available for the flush
sequence after the injection.
3. Measure the volume of the sample, and record the result.
4. Repeat steps 2-3 until 3 samples have been produced.
5. Calculate the average volume using the following equation (all volumes in
millilitres):
(VOLUME
Sample1
+ VOLUME
Sample2
+ VOLUME
Sample3
)/3 = VOLUME
AV
6. The theoretical volume of resin per pump stroke is 100 millilitres, therefore
use the following equation to calculate the actual volume of resin per stroke:
VOLUME
AV
/ (1000 * Litres) = VOLUME
AV
/ 2000 = Litres per pump
stroke.
7. Enter this value on the resin calibration screen (see section 4.6).
8. Perform a further 3 tests to ensure that calibration has been performed
correctly. The volume delivered should be within +/- 100 millilitres of the
quantity of resin specified in the recipe.