Electrical System
11-4
Part 1079832_04
E 2015 Nordson Corporation
Heaters and Sensors
Heaters and sensors are an integral part of the cordset. If necessary,
cordsets can be rebuilt by qualified personnel, allowing you to replace just a
heater or a sensor.
Heaters are housed in a bore (or bores) inside the adhesive and heated air
manifolds and are secured by a heater retainer and screw, as shown in
Figure 11‐5. When power is supplied to the heaters, they heat the adhesive
or the pattern air in the applicator manifolds. Two heaters are present when a
zone's heating requirements are higher. Typically, the heating requirements
of heated air manifold zones are greater than the heating requirements of
adhesive manifold zones.
RTDs are housed in a bore inside the adhesive and heated air manifolds and
are secured by a bayonet adapter, as shown in Figure 11‐5. An RTD is an
electronic temperature control device in which the electrical resistance
changes predictably as the RTD's temperature changes (the higher the
temperature, the higher the resistance). The RTD relays the temperature of
the adhesive or pattern air to a melter control system or to a temperature
controller, which in turn adjusts the power supplied to the manifold heaters
accordingly.
2
1
4
3
1
2
4
3
Figure 11-5 Adhesive manifold cordset (left) and air manifold cordset (right) heater and sensor configurations
1. Heater retainer and screw
2. Heater
3. Sensor 4. Sensor bayonet adapter
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