Page 1
Self-Regulating
Medium
Temperature/
PDS SRM/E
Enhanced
Heating Cable
• Self-Regulating, Energy Efficient
• 14 AWG Buss Wire
• Circuit Lengths to 780 Feet
• Process Temperature
Maintenance to 302°F(150°C)
• Maximum Exposure
Temperature (Power Off)
420°F (215°C)
• Industrial Process
Maintenance Applications
• Industrial Freeze
Protection Applications
• Freeze Protection of Fire
Protection System Piping
• Steam Cleanable On Process
Equipment Up to 300 PSIG
• 3, 5, 8, 10, 15 and 20 Watts
per Foot
• 120 and 208-277 Volts
Available From Stock
Description
Chromalox SRM/E self-regulating
heating cable provides safe, reliable
heat tracing for process temperature
maintenance and freeze protection of
pipes, valves, tanks and similar applications. Constructed of industrial
grade 14 AWG buss wire with metal
braid and optional overjacketing,
SRM/E ensures operating integrity in
most hostile industrial environments.
The 420°F (215°C) maximum exposure
temperature rating allows steam
cleaning of process equipment with
up to 300 PSIG steam.
Enhanced Features
• Industrial Grade, 14 gauge buss
wire has higher current capacity,
allowing longer circuit lengths up
to 780 feet.
• Superior matrix to buss wire
bonding ensures overall operating
integrity and performance.
• High output, 20 Watts per foot
heating cable.
• All ratings are available from stock.
Maintains up to
302°F
Withstands up to
420°F
Cut to Any Length in Field Can be Single Overlapped Medium Temperature Self Regulating
Output
Temperature
Features
• Energy efficient, self-regulating
SRM/E uses less energy when less
heat is required.
• Easy to install, SRM/E can be cut to
any length (up to maximum circuit
length) in the field.
• Field splices can be performed
easily in minutes with no scrap or
wasted cold sections.
• With lower installed cost than steam
tracing, SRM/E features less maintenance expense and down time.
• SRM/E can be single overlapped
without burnout, which simplifies
heat tracing of in-line process
equipment such as valves, elbows
and pumps.
• Because SRM/E is self-regulating,
overtemperature conditions are
virtually impossible.
• Chromalox termination, splice,
tee and end seal kits reduce
installation time.
• UL listed for use on fire protection
system piping
®
PRECISION HEAT AND CONTROL
PH: 1-888-996-9258 • FX: 615-793-3563
®
www.chromalox.com
©
2004 Chromalox, Inc.
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SRM/E — Self-Regulating Medium Temperature/Enhanced Heating Cable
Construction
Twin 14 AWG Copper Buss Wires .................. Provide reliable electrical current
capability.
Semiconductive Polymer
Core Matrix ............................................................. “Self-Regulating” component of the
cable, its electrical resistance varies with
temperature. As process temperature
drops, the core’s heat output increases;
as process temperature rises, the heat
output decreases.
High Temperature
Fluoropolymer Jacket ..........................................Flame retardant, electrically insulates
the buss wires and matrix, and provides
corrosion resistance.
Metallic Braid .........................................................Provides additional mechanical protection
in any environment, and a positive ground
path.
High Temperature
Fluoropolymer Overjacket ................................. Corrosion resistant, flame retardant
(Optional) overjacket is highly effective in most
Approvals
FM - Factory Mutual approved for ordinary areas.
UL Listed, CSA Certified for ordinary areas.
UL Listed for fire protection system piping
FM approved for hazardous (classified) areas when
used with Chromalox accessories:
• Class I, Div. 2, Groups B, C, D (gases, vapors)
• Class II, Div. 2, Groups F, G (combustible dust)
• Class III, Div. 2 (easily ignitable fibers and filings)
• 3, 5 and 8 Watt rated T3 Temperature Class
• 10,15 and 20 Watt rated T2D Temperature Class
CSA Certified for hazardous (classified) areas when
used with Chromalox accessories:
• Class I, Div. 2, Groups A, B, C, D
• Class II, Div. 2, Groups F, G
• Temperature Class T3*
*Exception: Cable surface temperature shall not exceed
190°C in Class II, Div. 2, Group F; 165°C in Class II,
Div. 2, Group G.
hostile, chemically active environments.
It also protects against abrasion and
impact damage.
Applications
• Process Temperature Maintenance
• Hydrocarbon and Chemical Product Piping
• Freeze Protection of Periodically Steam-Cleaned Pipes
• Freeze Protection of Fire Protection System Piping
• Fluid Flow and Viscosity Maintenance
2
Chromalox
®
®
• 1382 Heil Quaker Blvd. • LaVergne, TN 37086 • PH:
1-800-443-2640
• FX: 615-793-3563 • www.chromalox.com
Page 3
Self-Regulating Medium Temperature/Enhanced Heating Cable — SRM/E
Heating Cable System Design
1. Calculate Heat Loss
Using the Chromalox Design Guide (PJ304) for Heat Tracing, calculate the heat loss of the system. To calculate the
heat loss (Watts) you will need to know pipe diameter, insulation type and thickness, minimum ambient temperature
and the pipe maintenance temperature.
2. Select Cable Rating
After calculating the heat loss in the pipe and adjusting for any application deviations, you may determine which cable
rating to choose. Using the SRM/E Thermal Output Ratings graph, select the lowest cable rating that will provide the
output required to offset the heat-loss at the desired maintenance temperature. Adjust the cable output for line voltage
if necessary. Consult output wattage at alternative voltage table on page 5.
Thermal Output Ratings On Insulated Metal Pipe
24
Cable Output vs.
20
Temperature
20 W/Ft.
16
15 W/Ft.
12
10 W/Ft.
Heat Output (W/Ft.)
8
8 W/Ft.
5 W/Ft.
4
3 W/Ft.
0
30 50 70 90 110 130 150 170 190 210 230 250
Pipe Temperature (°F)
270 290
310
Chromalox
®
• 1382 Heil Quaker Blvd. • LaVergne, TN 37086 • PH:
1-800-443-2640
• FX: 615-793-3563 • www.chromalox.com
3
Page 4
SRM/E — Self-Regulating Medium Temperature/Enhanced Heating Cable
Specifications
Cable Ratings
Output @ 50°F Voltage Maximum Circuit Length*
Model Number (W/Ft.) (Vac) (Ft.)
SRM/E 3 -1C 3 120 385
SRM/E 3 -2C 3 240 780
SRM/E 5 -1C 5 120 375
SRM/E 5 -2C 5 240 750
SRM/E 8 -1C 8 120 325
SRM/E 8 -2C 8 240 600
SRM/E 10 -1C 10 120 250
SRM/E 10 -2C 10 240 490
SRM/E 15 -1C 15 120 210
SRM/E 15 -2C 15 240 420
Nominal
SRM/E 20 -1C 20 120 160
SRM/E 20 -2C 20 240 350
*See chart on page 4 for maximum circuit lengths by start-up temperature and circuit breaker size.
Output Wattage at Alternate Voltages (50°F) W/Ft.
Cable Rating 208 Volts 220 Volts 277 Volts
SRM/E 3 2.31 2.55 3.90
SRM/E 5 3.85 4.25 6.45
SRM/E 8 6.40 6.88 10.24
SRM/E 10 8.30 8.80 12.50
SRM/E 15 12.75 13.50 18.45
SRM/E 20 17.60 18.40 24.40
Model Numbers
SRM/E 8 - 1 C T
Overcoat Options
T = Fluoropolymer corrosion
resistant overjacket over braid
for hostile/corrosive environments
Voltage
1 = 120 Volts
2 = 208-277 Volts
Output (watts)
3, 5, 8, 10, 15 or 20 Watts per Foot
SRM/E
Self-Regulating, Medium Temperature/Enhanced Heating Cable
®
4
Chromalox
®
• 1382 Heil Quaker Blvd. • LaVergne, TN 37086 • PH:
Braid
C = Standard tinned-copper metallic braid for ground path
1-800-443-2640
• FX: 615-793-3563 • www.chromalox.com
Page 5
Self-Regulating Medium Temperature/Enhanced Heating Cable — SRM/E
Specifications
Cable Ratings
Model Number (W/Ft.) (Vac) (Ft.)
SRM/E 3 -1C 3 120 385
SRM/E 3 -2C 3 240 780
SRM/E 5 -1C 5 120 375
SRM/E 5 -2C 5 240 750
SRM/E 8 -1C 8 120 325
SRM/E 8 -2C 8 240 600
SRM/E 10 -1C 10 120 250
SRM/E 10 -2C 10 240 490
SRM/E 15 -1C 15 120 210
SRM/E 15 -2C 15 240 420
Output @ 50°F Voltage Maximum Circuit Length*
Nominal
SRM/E 20 -1C 20 120 160
SRM/E 20 -2C 20 240 350
*See chart on page 4 for maximum circuit lengths by start-up temperature and circuit breaker size.
Output Wattage at Alternate Voltages (50°F) W/Ft.
Cable Rating 208 Volts 220 Volts 277 Volts
SRM/E 3 2.31 2.55 3.90
SRM/E 5 3.85 4.25 6.45
SRM/E 8 6.40 6.88 10.24
SRM/E 10 8.30 8.80 12.50
SRM/E 15 12.75 13.50 18.45
SRM/E 20 17.60 18.40 24.40
Model Numbers
SRM/E 8 - 1 C T
Overcoat Options
T = Fluoropolymer corrosion
resistant overjacket over braid
for hostile/corrosive environments
Voltage
1 = 120 Volts
2 = 208-277 Volts
Output (watts)
3, 5, 8, 10, 15 or 20 Watts per Foot
SRM/E
Self-Regulating, Medium Temperature/Enhanced Heating Cable
Chromalox
®
• 1382 Heil Quaker Blvd. • LaVergne, TN 37086 • PH:
1-800-443-2640
Braid
C = Standard tinned-copper metallic braid for ground path
• FX: 615-793-3563 • www.chromalox.com
5
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SRM/E — Self-Regulating Medium Temperature/Enhanced Heating Cable
Ordering Information
Output Model
(W/Ft.) Voltage Number PCN
3 120 SRM/E 3-1 C 388025
SRM/E 3-1 CT 388033
208-277 SRM/E 3-2 C 388050
SRM/E 3-2 CT 388068
5 120 SRM/E 5-1 C 388084
SRM/E 5-1 CT 388092
208-277 SRM/E 5-2 C 388113
SRM/E 5-2 CT 388121
8 120 SRM/E 8-1 C 388148
SRM/E 8-1 CT 388156
208-277 SRM/E 8-2 C 388172
SRM/E 8-2 CT 388180
To Order: Specify length, Model Number, PCN and Installation Accessories.
Output Model
(W/Ft.) Voltage Number PCN
10 120 SRM/E 10-1 C 388201
SRM/E 10-1 CT 388210
208-277 SRM/E 10-2 C 388236
SRM/E 10-2 CT 388244
15 120 SRM/E 15-1 C 388260
SRM/E 15-1 CT 388279
208-277 SRM/E 15-2 C 388308
SRM/E 15-2 CT 388316
20 120 SRM/E 20-1 C 388332
SRM/E 20-1 CT 388340
208-277 SRM/E 20-2 C 388367
SRM/E 20-2 CT 388375
Accessories
Chromalox has a complete line of accessories specifically designed for use with SRM/E cable. Use only Chromalox
accessories to ensure the performance of the heat trace system.
Model Description
Thermostat RTAS DL Series air-sensing thermostat with Microswitch
®
for local control of circuit.
RTBC DL Series pipewall-sensing thermostat with Microswitch
®
for local control of circuit.
Power Connection RTPC DL Series power connection set kit.
RTST DL Series splice and tee set kit.
RTES DL Series end seal kit.
Pipe Straps PS-1, PS-3, PS-10 Pipe straps to affix thermostat and power connection splice kits to
pipes.
Fiberglass Tape FT-2 Tape to affix cable to pipe, 66' roll x 1/2", install on 12" centers.
Aluminum Tape AT-1 Tape to aid heat transfer, 180 foot roll.
Apply over cable along entire length of circuit.
Caution Labels CL-1 “Electrical Heat Tracing” caution labels, 5 per package.
Install every 10 feet.
Control Panels Contact your Chromalox representative for Control Panel information.
Note: For PCN's, refer to the DL Series connection system accessories product data sheet.
PJ314-5
PDS SRM/E
APRIL 04
®
6
Chromalox
®
• 1382 Heil Quaker Blvd. • LaVergne, TN 37086 • PH:
1-800-443-2640
• FX: 615-793-3563 • www.chromalox.com
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