Tinius Olsen MP1200 Extrusion Plastometer Page 17-2
Operation Manual # 02002215
17.3.3 The heater bands can be checked with an ohm meter by measuring the resistance at
the Main Terminal Strip located on the board of the MP1200 Controller (under
baseplate). The Bottom heater zone is approximately 132 ohms; the Middle is
approximately 220 ohms and the Top is approximately 88 ohms. The resistance
between any of the wires to the case of the heater should be above 10 Megohms.
17.3.4 The RTD probes can be checked with an ohmmeter. Each probe has three wires.
With the two common colored wires shorted, check the resistance between the
common colored wires and the odd colored wire. The resistance measured will vary
with the temperature of the probe. This resistance should be approximately 100
ohms at 0C and about 109 ohms at 23C. The resistance between any wire and the
case/sheath should be open (indefinite). (Continuity implies a low resistance check
using lowest range of meter instead of the highest). If any of these tests fail, replace
the probe and recalibrate.
17.3.5 The MP1200 Controller, with all heater zones on full, draws about 3 to 4 Amps at 115
VAC service and about 4.5 Amps at 230 VAC service.
17.3.6 The motor for the optional Motorized Weight Lowering Device draws about 1.0 Amp.
NOTE: The line filter used in the Power Entry Module typically has a leakage current of 0.25 mA to
ground at 115 VAC, and 0.5 mA at 220 VAC. This current leakage may cause a Ground
Fault Interrupt (GFI) receptacle to trip, therefore a GFI is not recommended.
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