Band and Strip Heaters

Rama®Band and Rama®Strip heaters are computer-designed and verified to Rama standards and customer specifications. Highest quality materials are used in manufacturing to assure long useful service life.

Clamping Rama®Band Heaters

Rama uses extra strength full band clamps, the standard, low-profile design utilizes a 22 gauge stainless steel with continuous strap and spot welded turnover. These provide full strength clamping with minimum heat distortion. In addition, Rama also provides a 90°     facing clamp, which is an integral part of the heater sheath, and the pin and-screw clamp, which is spot welded to the heater sheath and does not require a clamping band. These latter two designs are available upon request. All standard designs are supplied with the standard full clamp band.

Clamping/Derating Rama®Strip Heaters

Strip heaters should be firmly clamped to the surface to be heated to prevent expansion or bowing away from the heated surface. Clamping bars 1/4” thick are recommended spaced 3” to 4” apart. When spacing heaters as close as 3/4”, or in close proximity to bright reflective surfaces, reduce wattage by 10%.

Band & Strip Features

Our quality of work is our top priority. Here is a complete list of features.

Rama® Band Heaters

Mica Insulation

  • Uniform thickness with excellent electrical insulation
  • Mica sheets with excellent resistance to moisture

Resistance Wire

  • Precision wound by solid state turn counting winder for high repeat-ability and accuracy
  • Nickel/chromium
  • Uniform heat distribution

High Emissivity Sheath

  • Aluminized steel
  • Temperature range to 900°F
  • Rust resistant
  • Approximately .130” thick

Clamping Band

  • Rugged stainless steel construction
  • Design holds heater tightly against cylinder wall to maximize heat transfer
  • Standard gap is 1/4”

Leadwires

  • UL recognized rating
  • Continuous 450°C service
  • Standard leadwires are 12”

Installation and Operation

To maximize performance of the Rama®Band and Rama®Strip heater, follow these instructions

 

  • Do not bend 1 piece heaters
  • To provide close contact with heating surface, tighten clamping bands while taping around the outside of band heaters. After heat-up, occasionally re-tighten the clamping band.
  • Match the wattage of band and strip heaters as closely as possible to avoid excessive on/off cycling.
  • To tighten post terminals, bottom nut should be held in place while tightening top nut (to avoid putting stress on terminal).
  • Avoid spilling oils, grease, water or molten plastic on leadwires, post terminals or ends of heaters.
  • Do not pull on leadwires with a force exceeding 15 lbs.
  • Make sure strip heaters fit in close contact with surface to be heated, using clamping bars as required. After heat-up be sure heater has not expanded or bowed away from surface, retighten as required.
  • Select the band heater whose diameter most closely approximates the diameter of your part.

 

Configuration

Guide to design selection

Standard Designs

TYPECOVERINGRama®Band Rama®Strip
AMetal BraidSame side, each end 3/4” minimum width
B3” Fiberglass Sleeving
CMetal BraidSingle point of exit perpendicular to heater surface 1” minimum width
D3” Fiberglass Sleeving
EFlexible Metal Conduit
F3” Fiberglass SleevingEach end of heater on opposite sides 3/4” minimum width
GMetal Braid
H3” Fiberglass SleevingLeadwires exit each end of heater, perpendicular to heater surface 1-1/2” min width and 1-1/2” min dia
JMetal Braid
RAMA®BANDPOST TERMINALS RAMA®BAND RAMA ®STRIP
KEach end 1” min width and 1-1/2” min diameter
LSame end, adjacent; 2” min width
MSame end, tandem, 1” min width and 2” min diameter
MODLEADWIRES OR POST TERMINALS RAMA®BANDRAMA®STRIP
N2-piece, identical halves; any leadwire or post terminal configuration min ID 3.0”N/A
PWYE 3Ø, any leadwire or post terminal except Type C,D, or ESame
Q1-piece, bendable; any leadwire or post terminal except Type L under 3-1/2” widthN/A
RDual voltage/wattage; any leadwire or post terminal except Type C,D, or E (consult factory)Same
T90° facing clamp; any leadwire or post terminal except A,B,F, or GN/A

Design Specifications

  • Standard leadwire length for all band and strip heaters is 12”
  • Max ID for 1-piece Rama®Band is normally 14-1/2”; anything over 14-1/2” would be a 2-piece design. Consult factory for longer ID requirements.
  • Min ID for 2-piece Rama®Band construction is 3”.
  • Standard terminal box dimensions: 1-1/2” wide, 1-1/2” depth at centerline, length may vary based on configuration. Dimensions for heaters with terminal box: Min heater Dia is 3”, min width is 1-1/2” Min Dia for 2-piece construction is 6”.
  • Note: The Min Dia may be grater depending on type of terminal used on heater.
  • For welded barrel nut clamps the top metal outer sheath must be stainless steel.
  • Select heaters with diameters closely matching your cylinder or barrel ; allow a .25” gap between ends to prevent touching when they are clamped.
  • Strip heaters under 2” wide have a full fold over.

Engineering Guide

Guide to design selection

Rama®Band Engineering Guide

  1. Select heaters with diameters closely matching your cylinder or barrel, allow a gap between ends to prevent touching when they are clamped. Standard gap is 1/4”.
  2. Calculate the surface area of your cylinder to be heated.
  3. Using the curves shown, determine the recommended watt density for your operating temperatures. For heaters 2-1/2” or wider decrease watt density by 15%. Decrease watt density by 30% when using “on/off” thermostats instead of solid controllers.
  4. Multiply surface area by watt density to determine required wattage for your heater.
  5. Select correct combination of heaters from standard designs.

 

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Band & Strip Heater Products

In Stock Band & Strip Heaters

Items coming soon!

  • SPECIFICATIONS:

  • (OUTER DIAMETER OF PART HEATER IS TO GO ON)
  • (LENGTH OF THE AREA ON THE PART HEATER IS TO COVER)
  • (IF NOT GIVEN WE WILL DESIGN FOR VALUES BEING AT STARTUP TEMPERATURES OF 68°F)
  • CONFIGURATION:

  • DESIGN FEATURES:

  • A DRAWING MUST BE SUBMITED FOR SPECIAL HOLES, CUTOUTS, UNUSUAL SHAPES, THERMOSTAT PLACEMENT, THERMOCOUPLE PLACEMENT, ETC. CONSULT FACTORY FOR STRIP HEATERS OVER 45” LONG OR 12” WIDE.
  • RAMA CORPORATION
    QUOTE FORM FOR RAMA®STRIP HEATER

  • SPECIFICATIONS:

  • (IF NOT GIVEN WE WILL DESIGN FOR VALUES BEING AT STARTUP TEMPERATURES OF 68°F)
  • CONFIGURATION:

  • ±2%
  • DESIGN FEATURES::

  • A DRAWING MUST BE SUBMITED FOR SPECIAL HOLES, CUTOUTS, UNUSUAL SHAPES, THERMOSTAT PLACEMENT, THERMOCOUPLE PLACEMENT, ETC. CONSULT FACTORY FOR STRIP HEATERS OVER 45” LONG OR 12” WIDE.

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