ecodyst Hydrogen - Page 56

50 Accelerating the path to discovery
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The HPC controller’s architecture, in which the two controllers’ capacity to sense temperature and act independently
of one another, gives it special safety benets. This highlights the safety advantages of this structure when
considering how the controller reacts to various kinds of heating failures. The over-temperature protection circuit
is engaged and cuts o all power to the heater if the High Limit controller fails to close. If it fails open, the setpoint
controller’s ability to regulate temperature and keep the process at the correct temperature is unaected. If the
setpoint controller malfunctions, the heater will get unchecked maximum power, which is the most severe failure
state. The heating mantle’s power is permanently cut o when the over-temperature safety circuit is turned
on by the High Limit controller. The process just cools to room temperature if the setpoint controller fails to
operate. Since each controller has its thermocouple, the aforementioned situations emerge from a failure with
either thermocouple. For the highest level of safety during unattended operations, the HPC controller oers
comprehensive, 100 percent redundant control over the heating process.
Each controller has a certain type of temperature sensor input that can only be used with that temperature sensor
(thermocouple or RTD). The thermocouple type must match the receptacle type on the rear of the controller for
the proper temperature to be shown. Blue indicates a type T thermocouple, Yellow is a type K, and Black is a type J
thermocouple. The thermocouple plug’s color must match the receptacle on the controller’s rear. The high limit and
setpoint controllers are both wired to the thermocouple socket. Therefore, the controllers display an error message
and halt heating if the thermocouple breaks or becomes detached. If a dual-element thermocouple isn’t available,
two single-element thermocouples may be substituted.
3.4 Heating Mantle Restrictions
Two factors need to be considered when heating equipment (in this instance, the heating mantle):
1. Placement of the temperature sensor (Section 2.2) and,
2. The appropriate power setting.
NOTE: Before leaving the factory, your purchased controller would be tuned to the appropriate power setting
of the heating mantle it was purchased with. Any questions or help needed with technical knowledge should be
directed to our team before any technical modications are done to your system.
3.5 Heating Equipment
High Powered Heating Mantle Controllers