Thermon TraceNet TCM 18 - Manual (Page 90)

PIPE TEMPERATURE
DEGREES CELSIUS
144
139
TIME ➞
Example D5 - Process Temperature Control - Dual RTD Sensing
It is sometimes considered advantageous to use dual RTD sensors on a critical heat
tracing application such as a 50% caustic line. In this way, the power to the heater
can be based on the input of two discrete temperature inputs rather than one. In ad-
dition, in the event of an RTD fault, the operator can be alarmed, the circuit can be
acknowledged, and the RTD can be repaired without turning the heat tracing circuit
OFF. For this application, the typical design requirements are as listed below:
Product Maintenance Temperature 80 ◦ F (27 ◦ C)
Product Freeze Point 54 ◦ F (12 ◦ C)
Heater Cable Type Self Regulating Parallel Cable
Maximum Caustic Temperature 100 ◦ F (38 ◦ C)
PN 50316_0514 86