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Example 2: Given a maximum allowable liquid temperature of 140°C, a
2.3.d Internal Over-Temperature Protection
The Trebor ID heater is supplied with a temperature sensor(s) located
near the top of the quartz substrate. The control system must limit the
quartz substrate temperature interlock sensor to a maximum temperature
of 200°C. Note, two types of sensors are available – thermocouple and
RTD. See Section 7 for wiring instructions.
2.3.e Liquid Level Sensor Interlock
The Trebor ID heater requires a liquid level interlock with a sensor located
at the heater outlet to prevent dry operation, see Figure 2-2 for example.
See Section 7 for wiring instructions for Trebor's optional liquid level
sensor.
INLINE CHEMICAL HEATER OPERATION / MAINTENANCE MANUAL
T
= 236.6°C (Maximum allowable element temperature)
e
heater rated at 6 kW and a 75% duty cycle, the maximum
element temperature limit is:
T
= 140°C + (6)*(0.75)*(16.1)
e
T
= 212.5°C (Maximum allowable element temperature)
e
Figure 2-2
PAGE 9
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