Operation

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HCCM-2100 monitors individual process (i.e. pipe) temperatures at the end of each heating circuit where the available voltage to power the heater cable is lowest (due to voltage drop). For long or critical pipelines it may be desired to monitor pipe temperatures at multiple locations along a pipe and the piping dead-legs. The integrity of each heating cable circuit including the heating cable, power wiring and all connections are independently monitored from every transmitter location.

HCCM-2100 monitors individual process (i.e. pipe) temperatures

In addition to the control setpoint, each zone has a low and high temperature alarm setpoint. If this setpoint is reached, a discrete low temperature LED for that zone is illuminated, and an alarm relay is energized. The same LED provides indication of sensor failure or damage by blinking and energizing an alarm relay.

The HCCM-2100 system monitors the integrity for the entire system, cables, wiring and monitoring components, and includes comprehensive self-diagnostic routines to insure that all of the system components are operational. In the event of any alarm or component failure, the system will turn the heater on insuring fail-safe protection of the fluid piping. A dedicated LED for each zone indicates loss of communication due to either electronic, heater cable, or power wiring damage or failure.

In conventional heat-tracing systems where thermostats and indirect current sensing are used for monitoring and control, a failure of one of the system components may be undetected. The HCCM-2100 system remains active all year long, periodically checking the entire system operation even during periods where heat tracing is not required. HCCM-2100 will alarm and notify maintenance personnel of problems when they occur, long before the heating season begins.

Timing Procedure

Upon initiation the HCCM-2100 System stays energized for a maximum of five minutes to run self-diagnostics of the entire heat tracing system, including the heating cable, power wiring, field connections and splices, remote terminals, temperature sensors, and associated components of the control and monitoring system.

Following the first five minutes on, the system turns off for not less than five minutes. When the system turns back on the NC-2104 calculates the rate of temperature change and the length of time the system can be safely turned off.

The length of the off period is maximized automatically, based on the process temperature, control setpoint, and rate of the temperature change, but never exceeds three hours.