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28 Hayward St., Ipswich, MA 01938
Tel: 1-978-356-9844, Fax: 1-978-356-9846
www.DaltonElectric.com
We are an authorized distributor for Dalton Electric Heating Company, Inc., who began manufacturing Diff-Therm Diffusion Pump Heaters in 1958. Today, Diff-Therm heaters are the replacement heater of choice for vacuum OEM diffusion pump users.
The Diff-Therm heater is a combination of high-quality, tubular heating elements and grey iron castings (platens and rings) swaged together under 50 tons per square inch pressure. For over twelve years of service to the vacuum industry in the United States and Canada, these heaters have been the industry standard for long life, for uniformly distributed process heat, and for efficient power generation.
Dalton Electric Heating manufactures stock Diff-Therm heaters for 2" through 48" Diffusion Pumps in over 100 combinations of electrical ratings and casting sizes. They also manufacture Diff-Therm heaters in custom casting dimensions and electrical ratings for use on obsolete and foreign-made pumps.
In summary, Diff-Therm heaters provide you with...
They are the proven, industry standard.
Illustrations 1 and 2 below tell the
story of Diff-Therm's performance superiority over other, bolt-on Diffusion Pump
heaters. Dalton manufactures tubular heating elements using only high purity
magnesium oxide, nickel chrome resistance wire and stainless steel terminals for
internal components. Special filling equipment and methods compact the magnesium
oxide inside and around the resistor helix to extreme density which, coupled
with swaging, gives Diff-Therm heating elements high dielectric strength and
efficient internal heat conduction. These properties are then maximized as the
heating elements are further compacted by being swaged into undercut grooves in
the Diff-Therm castings. This process locks the heating elements into con-tact
with the castings, creating uniform heat conduction into the castings along the
entire length of the grooves.
The surface of a Diff-Therm casting, which will be in contact with the Diffusion
Pump boiler plate, is machined to a flat, smooth finish. When the assembled
heater is bolted onto the Pump, heat is conducted efficiently and uniformly into
the boiler plate for a steady vaporization of the Pump fluid.
Illustration 1
Illustration 2
Selection Chart:
Platen Number 2/9D |
Platen Number 4D |
Platen Number 5D |
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Platen Number 3/2D |
Platen Number 4/2D |
Platen Number 5/5D |
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Platen Number 3/3D |
Platen Number 4/9D |
Platen Number 6D |
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Platen Number 6/5D |
Platen Number 7/3D |
Platen Number 10R |
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Platen Number 6/9D |
Platen Number 8R |
Platen Number 10/9D |
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Platen Number 7D |
Platen Number 8/2R |
Platen Number 11D |
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Platen Number 12D |
Platen Number 15R |
Platen Number 12/3 RI (typical) |
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Platen Number 14R |
Platen Number 16/8R |
Selector Index:
Diffusion Pump Manufacturer1 | Platen Number | Platen Diameter (D) or Radius (R)2 | Number of Heating Elements in Platen | Location of Heating Element Terminals3 |
CVC Products | 2/9D | 2 15/16"-D | One | Inside - 90º |
Denton Vacuum, High Vacuum Equipment | 3/2D | 3 1/4"-D | One | Outside - 0º |
Perkin-Elmer | 3/3D | 3 5/16"-D | One | Inside - 90º or 45º |
Varian/NRC, Edwards High Vacuum | 4D | 4 1/32"-D | One | Outside - 0º |
Perkin-Elmer | 4/2D | 4"-D | One | Inside - 90º or 45º |
Varian/NRC, CVC Products, Edwards High Vacuum | 4/9D | 4 7/8"-D | One | Outside - 0º |
Varian/NRC, High Vacuum Equipment, Torr Vacuum | 5D | 5 1/8" -D | One | Outside - 0º |
Cooke Vacuum Products | 5/5D | 5 1/2"-D | One | Inside - 45º |
Varian/NRC, Edwards High Vacuum | 6D | 6"-D | One | Outside - 0º |
CVC Products | 6/5D | 6 1/2"-D | One | Inside - 90º |
CVC Products, Edwards High Vacuum | 6/9D | 6 15/16"-D | One | Outside - 0º |
Varian/NRC, High Vacuum Equipment, Torr Vacuum | 7D | 7"D | One | Outside - 0º |
Cooke Vacuum Products | 7/3D | 7 1/2"-D | One | Inside - 45º |
Varian/NRC | 8R | 8 1/4"R | One | Inside - 45º |
CVC Products | 8/2R | 8"-R | One | Inside - 90º |
Varian/NRC, Edwards High Vacuum lOR | 10R | 9 1/4"-R | One | Inside - 45º |
CVC Products | 10/9D | 11 1/16"-D | Three | Inside - 45º |
Varian/NRC, Torr Vacuum | 11D | 10 15/16"-D | Three | Inside - 45º |
Varian/NRC | 12D | 12 1/2"-D | Two | Inside - 45º |
Varian/NRC | 14R | 14 1/4"-D | Two | Inside - 45º |
Varian/NRC | 15R | 14 1/4"-R | One | Inside - 45º |
Varian/NRC | 16/8R | 16 1/2"-R | One | Inside - 45º |
1. Dill-Therm
Heaters originally designed for Diffusion Pumps of these manufacturers.
2. Radii
listed above are measured between apex of the angle formed by extending Platen
sides to a point and outside edge of Platen (see illustrations).
3. "Inside"
and "Outside" relate terminal locations to the Platen perimeters. The angles
listed are between the terminals and the surfaces of the Platens.
Copyright © 1997-2001 Dalton Electric Co., Inc. All Rights Reserved. Used with permission of Dalton Electric Co., Inc.
We are a Distributor of Industrial, Commercial and Residential Heaters and Controls. Always consult manufacturers installation instructions for proper installation of the products or systems shown on this website. © Copyright 1999-2019 Mor Electric Heating Assoc., Inc. MOR
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