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6.3
INTERLOCK SENSORS
ALARM
Liquid Leak
Element Over-
Temperature
Liquid Over-Temperature
Liquid Level
INLINE CHEMICAL HEATER OPERATION / MAINTENANCE MANUAL
CAUSES
Liquid leak detected inside
heater housing
Sensor/wiring shorted or
improperly wired to
interlock
No liquid or insufficient
flow through the heater
Insufficient control settings
or scheme
Sensor/wiring shorted or
improperly wired to
interlock
Insufficient flow through
the heater
Insufficient control
algorithm
Sensor/wiring shorted or
improperly wired to
interlock
Insufficient liquid present in
heater
Liquid boiling
Sensor/wiring shorted or
improperly wired to
interlock
SOLUTIONS
If liquid is present in the
housing, decommission
and replace heater per
Section 5.3.
Inspect/test sensor wiring.
Increase flow rate.
Modify control settings or
scheme to limit the
element to ≤250°C.
Inspect/test sensor wiring.
Increase flow rate.
Check for blockage.
Relocate outlet
temperature sensor
closer to heater outlet.
Adjust control settings or
scheme.
Inspect/test sensor wiring.
Increase flow rate.
Review liquid properties
vs. conditions.
Adjust sensor
Inspect/test sensor wiring.
PAGE 19
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