Processor Technology SHC Series - Safety Features

M-62-04 SHC-1.4-61RQH-R-0070 Manual
Revision - Date: 02 – 09/23/2015
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SAFETY FEATURES:
Safety System Network:
The SHC inline heater is supplied without a Temperature Control package. Certain safety
interlocks must be incorporated into the control package to prevent damage to the heater and
ensure the safety of the operator. Each interlock circuit monitors a critical operating parameter
of the heater. The control system is designed so that if a "fault condition" is detected by one of
the sensors, the power to the heating element is disengaged. The shutdown mechanism may
be momentary or latching; refer to table below.
Safety device Operation Type of Shutdown
Pump Interlock
Monitors condition of pump,
disrupts power to heater when
pump is not in operation.
latching
Electrical Safety
Interlock
Monitors for over-current, short-
circuit and ground-fault conditions,
disrupts power to the heater when
fault condition is detected
latching
Process
Temperature Control
Device
Monitors temperature of fluid,
disrupts power to heater when
temperature rises above setpoint.
momentary
Process Over-
Temperature Control
Device
Monitors temperature of fluid,
disrupts power to heater when
temperature rises above setpoint.
momentary
Heater Core
Temperature Control
Device
Monitors temperature of heater
core, disrupts power to heater
when temperature rises above
setpoint.
momentary
Heater Element TCO
Monitors temperature of heating
element, disrupts power to heater
when temperature rises above melt
point of TCO.
latching
Table 3: Safety System Network