Nelson™ Heat Trace Type HLT Self-Regulating Heater Cable

Nelson

Nelson™ Heat Trace Type HLT Self-Regulating Heater Cable

Nelson

Nelson™ Heat Trace HLT Series self-regulating heater cable is ideal for maintaining flow over a wide range of operating temperatures. The product is used for freeze protection of periodically steam (200 psig) cleaned pipes and temperature maintenance for 121 °C (250 °F) or lower processes. HLT Series heating cables are available in 120 and 240 voltages and are designed for use in ordinary (unclassified) and hazardous (classified) locations. Typical applications include hydrocarbon and chemical product piping.

Specifications

Certifications and Compliances
UL Listed, CSA Certified, FM Approved: Hazardous (Classified) Locations
Underwriter's Laboratory
-CB or -J options: Class I, Division 2, Groups A, B, C, D; Class II, Division 2, Groups F, G; Class I, Zone 1, AEx e II. D1- option: Class I, Division 1, Groups B, C, D; Class II, Division 1, Groups E, F, G; Class III
Canadian Standards Association
-CB or -J options: Class I, Division 2, Groups B, C, D; Class II, Division 2, Groups E, F, G; Class III, Class I, Zone 2, Group IIB+H2. -J option: Class I, Division 1, Groups B, C, D; Class II, Division 1, Groups E, F, G; Class I, Zone 1, Group IIB, Zone
Factory Mutual
-CB or -J options: Class I, Division 2, Groups A, B, C, D; Class II, Division 2, Groups F, G; Class III. -J option: Class I, Zone 1 AEx e II; Group IIC. D1- option: Class I, Division 1, Groups B, C, D; Class I, Zone 1; Group IIB
Maintain Temperature
+120 °C (+250 °F)
Maximum Continuous Exposure Temperature
+120 °C (+250 °F) continuous power on
Maximum Intermittent Exposure Temperature
+215 °C (420 °F) 1000 hours cumulative exposure
Temperature Classification (T Code)
T3 +200 °C
Bus Wire Size
16AWG Copper Conductors
Minimum Installation Temperature
-40 °C (-40 °F)
Minimum Bend Radius
25.0 mm (1.0 in) at -40 °C (-40 °F)
Dimensions
5.1 mm x 10.5 mm (0.201 in x 0.413 in)
Accessories
Connection kits, thermostats, contactors, junction boxes, tape, warning signs, custom control, and monitoring and power panels are available. See catalog pages for details

Features

  • Type HLT self-regulating heater cable is a parallel circuit electric heater strip. A conductive fluoropolymer core material is extruded over the multi-stranded, nickel-plated, 16-gauge copper bus wires. A fluoropolymer jacket provides excellent dielectric strength, moisture resistance, protection from impact and abrasion damage, and a wide range of chemical resistance. A stranded tinned copper metal braid is supplied on all heaters. An optional fluoropolymer overjacket can be specified when the heater cable is to be installed in wet or corrosive environments. The base product is supplied with a tinned copper metal braid that may be used in both general applications and in dry, non-corrosive hazardous (classified) areas.
  • Operating principle: The parallel bus wires apply voltage along the entire length of the heater cable. The conductive core provides a continuous parallel heating element permitting the cable to be cut to any length in the field with no dead or cold zones developing. The heater cable derives its self-regulating characteristic from the inherent properties of the conductive core material. As the core material temperature increases, the number of conductive paths in the core material decreases, automatically decreasing the heat output. As the temperature decreases, the number of conductive paths increases, causing the heat output to increase. This occurs at every point along the length of the cable, adjusting the power output to the varying conditions along the pipe. The self-regulating effect allows the cable to be overlapped without creating hot spots or burnout. As the cable self-regulates its heat output, it limits the maximum sheath temperature, while also providing useful power for process temperature maintenance.
  • Voltage ratings: 240 Vac products are suitable for use on supply voltages of 208-277 Vac. See catalog pages for details.

Documents & Drawings