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An integrated magnetic reed switch allows a non-intrusive method for
verification of sensor operation. Pass a strong magnet around the bottom
of the heater just out from the drain plug to engage the reed switch and
trigger the leak sensor see Figure 2-1. If magnet is not strong enough,
remove the drain plug and move magnet into drain hole for testing.
See Section 7 for wiring instructions.
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 ID 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
element temperature (T
kW, etc.) and duty cycle (duty %). T
Example 1: Given a maximum allowable liquid temperature of 140°C, a
PAGE 8
Figure 2-1
°C), heater power rating (P - i.e. 3-kW, 4-kW, 6-
e
heater rated at 6 kW and a 100% duty cycle, the maximum
element temperature limit is:
T
= 140°C + (6)*(1.00)*(16.1)
e
INLINE CHEMICAL HEATER OPERATION / MAINTENANCE MANUAL
°C) can be estimated from the
max
= T
+ P * duty * 16.1
e
max
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