Hot runner temperature control system is control manifold and nozzle.

Now,we mainly use two thermocouple,Needle type thermocouple and right angle type thermocouple.

Needle type thermocouple is use on nozzle and right angle type thermocouple use on hot manifold.

Thermocouple purpose is detect temperature then reflect the achieved signal to temperature control.

Thermocouple woking principle is base on thermocouple thermo-electric effect.

Thermocouple produced thermoelectric force E will vary from measured temperature.

Thermocouple thermo-electric effect is a closed loop circuit that make up by two different material metal A and B.

Please see the following picture:

Thermocouple thermo-electric effect

Under the condition of material is same,current size is proportional to temperature T and T0.

And its polarity depends on the wire material.

The emergence of the current in the circuit showing thermal electromotive force exist in inner and T is equaled to T0.

this this thermocouple thermo-electric effect. A and B in the picture is called thermode,A is positive pole and B is cathode.

A and B are placed on one end of the measured medium temperature T,

called work end or hot end. Another end is called referenced end or cold end.

Anole is a Chinese agent of German heating elements.

GC &HOTSET heating elements is are most stable and long using life in German.

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