Tinius Olsen MP1200 Extrusion Plastometer Page 11-6
Operation Manual # 02002215
thermometer. (10-15 min recommended).
You can take all three measurements and then enter them at one time, or take a reading and
enter it, then move on the next zone. Expect to have to do each zone several times. Hint:
For the first several attempts don’t enter the exact thermometer reading. Calculate about
half the difference between that reading and the Set Point and enter that. For example, at
190
o
C if the thermometer reads 192.0
o
C enter 191.0
o
C. This may help save time.
Otherwise the controller may overcompensate and you have to bounce back and forth until
you home in on it.
After you make an adjustment to any zone, go back and recheck the other zones. When you
move the reference thermometer down in the barrel allow extra time to stabilize.
When the 190
o
C check is complete, move on to 230
o
C, and then to 300
o
C. It will take about
half an hour to an hour to reach a new temperature and stabilize.
When finished, it will be necessary to enter the calibration Offsets. This is found under the
User Settings (pass-code 8 3 4), Cal Offsets. See Section 12 for more information.
11.3.1 Calibrate PPDT
PPDT Calibration is accessed by selecting CONFIGURATION (pass-code 8 3 5), then
CALIBRATE, then CALIBRATE PPDT. It will only be active if the PPDT selection on the
Machine Settings screen is set to ON.
Select the PPDT TYPE. In most cases it will be ENCODER WITH INDEX PULSE.
Confirm that the ENC. LINES is set to 25000.
Full Calibration – Full Calibration is used to set the index pulse of the encoder inside of the
PPDT. To perform a Full Calibration, press the Full Calibration key and follow the
instructions prompted on the screens.
Short Calibration – Short Calibration is used to enter the arm length (after repair or
replacement) and to zero the PPDT. Press the Short Calibration key. This will display the
Final Calibration Step screen.
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