Trebor IQ Chemical Heater - Manual (Page 7)

MODEL IQ CHEMICAL HEATER OPERATION / MAINTENANCE MANUAL PAGE 7
Figure 2-1
Note: The heater has no provision for monitoring or controlling flow rates
or provisions to turn off flow to the heater during a leak alarm. It is
recommended that the user incorporate a separate interlock to isolate
flow and power from the heater in the event of an alarm.
2.3.b Element Over-Temperature Protection
The Trebor IQ chemical heater is supplied with a temperature sensor(s)
located on the heater element. The element temperature sensor(s) must
be used with an interlock to ensure the element temperature does not
exceed 250°C. Note, two types of sensors are available
– thermocouple
and RTD. See Section 7 for wiring instructions.
2.3.c Liquid Over-Temperature Protection
The maximum liquid temperature (T
max
°C) can be estimated from the
element temperature (T
e
°C), heater power rating (P - i.e. 3-kW, 4-kW, 6-
kW, etc.) and duty cycle (duty %). T
e
= T
max
+ P * duty * 16.1
Example 1: Given a maximum allowable liquid temperature of 140°C, a
heater rated at 6 kW and a 100% duty cycle, the maximum
element temperature limit is:
T
e
= 140°C + (6)*(1.00)*(16.1)