The
GPT 230 Dual Channel Heat–Trace Control is a dual-point microprocessor-based heat-trace control
thermostat. It is ideal for applications which require two independent heater-control Channels with Ground–Fault
Equipment Protection (GFEP). Ideal uses include freeze protection,
hot water temperature maintenance, grease line trace, tank heating, and other
temperature monitoring and control applications.
The
GPT 230 Heat–Trace Control operates from the heater’s
power source. A universal power supply allows the GPT 230 to operate
from 100 V ac to 277 V ac. It can independently or jointly control two resistive loads up to 30 amps each.
The
temperature setpoint is adjustable from −99.9 °F to 999 °F
(−73.3 °C to 537.7 °C) to a tenth degree resolution.
The
GPT 230 comes with a 100K ohm thermistor temperature sensor with a 20
ft. jacketed cable. The included sensor has an operating range of−40°F to 230°F (−40°C to 110°C). The GPT 230
can also use 2–, 3–, or 4–wire RTD sensors for
systems requiring high–temperature sensing. Two temperature sensor inputs are provided, and the channels can operate independently or from one sensor.
The
GPT 230 monitors temperature, load current, and ground leakage
current. Alarms include high temperature, low temperature, high load
current, low load current, ground fault, sensor fault, internal
fault, and power fail. These alarms are easy to adjust and observe
from the front panel. The GPT 230 can be set to energize or
de-energize the heaters during a sensor fault.
The
GPT 230 Heat–Trace Control includes integral GFEP for each channel. This
eliminates the extra expenses associated with having to provide
separate GFEP components in the circuit panel. The GPT 230 normally
disconnects power immediately to the affected zone when ground fault current exceeds the
set value. If it is set to Fire Protect mode, for critical fire
protection systems, then it will generate the alarm but power will be
maintained to prevent freezing.
To
ensure continued safe operation, the GPT 230 performs a self–test
of the GFEP circuit when power is first applied, along with a load
ground fault test, and this repeats periodically thereafter at an
adjustable interval.
