Chromalox ITLSC1D2 2-48 Line Sensing Heat Tracing Control Panel Class I, Div. 2, 2-72 Loops


  • Class I, Division 2 Hazardous Environments – Groups A, B, C, D
  • 7″ or 10″ Touch Screen HMI
  • 100-480V 1-Phase Supply
  • SCR Control – PID, On/Off or Manual Control
  • 2 to 72 Circuits
  • NEMA 4 or NEMA 4X Enclosure
  • User Selectable Soft Start Feature
  • Customizable Sensor Mapping
  • Full Communications
  • Full Alarm & Monitoring Capabilities on GFEP, Temperature, Sensor, Current Load & Communications
  • UL, cUL Listed
  • Optional CE Certification

The intelliTRACE ITASC1D2 and ITLSC1D2 Series is a micro-processor based Control/ Monitoring and Power Management system for Ambient Sensing, Line Sensing or a combination of Line and Ambient Sensing Heat Trace Applications and is suitable for use in Class I, Division 2 environments. The base panels will handle 2 – 48 loops and may be increased up to 72 loops with the Extension Panels. Each circuit has a 40 Amperage capacity and accepts 100 to 480 Vac service. The SCR Control may be set to Automatic, which includes PID or On/Off control or to Manual, which spans a 0% to 100% control output. The HMI is a 10” (25.4 cm) user friendly touch screen computer. It displays the process variable, temperature setpoint, alarm status, current load, control mode, sensor failure manual override output for any 2 or 6 loops at a time as well as the alarm status for all other loops. The standard enclosure is rated for NEMA 4 environments and an optional NEMA 4X 304 SS enclosure is available.

The ITASC1D2 / ITLSC1D2 Control Panel Series provide alarms for high and low temperatures, current load, communications, sensor faults and ground fault leakage. There are several output/control behavior scenarios for the ground fault (GFEP) alarm condition. Choices include Trip and/or Latch options in which both, either or none may be enabled. Trip sets the output to zero %, while Latch requires a manual reset. Alarm events are automatically logged and stored for easy access. Advanced standard features include a proprietary soft start function, off duty Auto Cycle maintenance program and either Modbus RTU/RS485 or Ethernet communications. Optional features include an industry leading Sensor Mapping** function, remote monitoring and wireless communications.

Advanced Features

Soft Start Feature

Certain heating cables exhibit inherent current inrush in colder temperatures. This inrush can cause nuisance breaker tripping. To limit inrush current on the overall system, a proprietary Soft Start algorithm is applied during system start-up. This will ONLY occur while the operation mode is set to AUTO. After the Soft Start program completes its cycle, the Control Mode of the system will either be PID or ON/OFF Control Mode, depending what was selected by the user. The default setting of the Soft Start Feature for each circuit is “enabled”. However, the Soft Start Feature may be disabled if so desired by the owner. The owner has the option to independently manage the Soft Start Feature on each circuit.

Auto Cycle Feature

During prolonged down time periods, typically during the summer months, it advisable to intermittently exercise the system circuits. This exercising of the loops is accomplished via the Autocycle feature. On a sequential circuit basis, the Autocycle feature periodically monitors system performance between 1-999 hours. This provides a certain level of predictive maintenance of the system as Faults (Alarms) will present themselves accordingly. Problem areas may be addressed during non-essential operating periods. The owner has the option to engage or disengage the Autocycle feature at any time.

Sensor Mapping**

The ITLS & ITLSC1D2 Models provide the owner with customizable Sensor Mapping. This becomes a very powerful and desirable feature when the owner needs added flexibility in controlling the circuit outputs beyond the standard single sensor input.

** Available only on ITLSC1D2 & ITLSC1D2-EXT


Supply Voltage 100 – 600 VAC, 3 phase
Operating Environment -40 to +104°F (-40 to +40°C)
Enclosure NEMA 4 or Optional NEMA 4X 304 SS
Communications Modbus RTU/RS-485, Ethernet
Alarms Hi/Lo Temp, GFEP – 20mA to 150 mA, Hi/Lo Current – 0.1 to 50A or off
Input 100Ω Platinum 3-wire RTD
Output SCR, Zero cross fired
Current Maximum 40 Amps/Circuit at 104°F (40°C)
Auto-Cycle 1-999 hours/off
Failed Sensor Output Setting 0 – 100%
Control Mode Auto, Manual (Hand), Off
Auto: PID or ON/OFF with adjustable dead band
Manual: 0% – 100% output, 1% increment
Load Management DOT (Demand On Transfer) timing, with Soft Start
Approvals UL, cUL Listed. Optional CE Certification
Area Classifications HAZ Class 1 Div 2
Temperature Rating T4A (uL) (Derate to T3 & Groups B,C,D when using enclosure heater)

Ordering Information


Chromalox ITLSC1D2 2-48 Line Sensing Heat Tracing Control Panel Class I, Div. 2, 2-72 Loops_DpstarGroup