Sunday, July 26, 2020

Types of Vacuum Feedthroughs

Vacuum Feedthrough

The main purpose of a vacuum feedthrough is to allow a substance, or a form of energy, to pass from outside of a sealed vacuum chamber to the inside. In so doing, the feedthrough must remain leak-free under both high and ultra-high vacuum conditions.

While quite different in construction style and application, the terms vacuum feedthrough, hermetic feedthrough, and electrical feedthrough are often used interchangeably by engineers, researchers, and scientists. No matter what they are called, they have the common purpose of allowing electricity, light, gas, or liquid to pass though a vacuum chamber's walls. The following are descriptions of several of the most common kinds of vacuum feedthrough:

A fiber optic feedthrough transfers emitted light through a fiber optic cable into  vacuum apparatus They provide a simple way to use optical fibers with vacuum chambers. They are available with flanged or screwed connections.

An electrical feedthrough carries some form of electrical energy into vacuum apparatus. The feedthrough usually has a single set. or multiple sets, of electrical conductors. These conductors can be pins, standard types of connectors, or lead wires.

Liquid and gas feedthroughs are used to carry liquids of gases in and out of a vacuum apparatus. The transfer is normally done using stainless steel tubes with epoxy-to-metal, ceramic-to-metal, or via an embedded compressing fitting.

A thermocouple feedthrough is  used for temperature measurement in vacuum applications. These feedthrough carry temperature instrumentation signals into  vacuum apparatus while providing electrical isolation and a hermetic seal. They are leak free in vacuum environments and can be supplied in most thermocouple calibrations, such as Type J, K, T, E, R, S, etc.

BCE, a Northern California based manufacturer of precision vacuum feedthroughs has a convenient vacuum feedthrough configuration tool here.

For more information on vacuum feedthroughs, contact BCE. Phone them at 510-274-1990 of visit their site at https://bcemfg.com/feedthroughs.

Monday, June 22, 2020

New Vacuum Feedthrough Product Designer from BCE

Vacuum Feedthrough Product Designer

BCE, a California based manufacturer of high quality electric heating components and vacuum feedthroughs, is now offering a vacuum feedthrough product designing app on their website, bcemfg.com.

The app allows the visitor to select from an array of options and design their own vacuum feedthrough. Once the design is complete, the visitor can request pricing and delivery from BCE automatically though an integrated email messaging system. The visitor also receives a confirmation of their request.

The vacuum feedthrough designer is the third in a series of online BCE product configuration tools. The three currently available are for cartridge heaters, BCE's Mini Clean Flow air and gas heaters, and now for vacuum feedthroughs.

You can check them out here - https://bcemfg.com/article_277_Product-Designer.cfm

BCE designs and manufactures custom electric heating thermal systems, electrical feedthroughs, pneumatic feedthroughs, and fiber optic feedthroughs. You can learn more about BCE at https://bcemfg.com, or if you have an immediate need, call them at 510-274-1990.

Tuesday, June 2, 2020

Improved Electric Heating Element Design Optimizes Rocket Engine Propellant Flow

BCE HEM Sealed Heater

You might think a rocket engine would give off enough heat to keep any part of the engine warm, but as it turns out, that's not the case. In many instances, the high flow of very cold propellants can cause obstructions in the propellant manifolds and valves. The need for localized heat becomes essential, and is normally provided by exterior, surface mounted, flexible resistive heating elements. The most common type of electric heater used in these applications are thin polyimide patches bonded directly to the valves and manifolds. While this approach may be convenient in terms of shape and mounting, that advantage is significantly reduced when you consider what you lose in heater efficiency and
heat uniformity.

BCE, a California based manufacturer of electric heating elements, has developed a better approach. Their BCE HEM Sealed Heater™ is designed to be inserted directly in the heated bodies, maximizing the heat transfer and heat uniformity. The HEM Sealed Heater™ is secured directly to components by the means of an integrated flange. In essence, the BCE HEM Sealed Heater™ incorporates both the cartridge heaters’ wire wound resistive element encased in a metal sheath and the vacuum compatibility of a feedthrough. Furthermore, the BCE proprietary epoxy seal allows the heater to pass strict electrical tests ensuring the purity of the dielectric materials and hence, preventing shorting.

Learn more about the HEM Sealed Heater™here.


BCE
https://bcemfg.com
510-274-1990

Friday, April 17, 2020

New! Product Builders for BCE Cartridge Heaters and Mini Clean Flow Heaters

BCE is pleased to introduce two new online product configuration tools that allow you to build an electric cartridge or a fluid heater from a selection of pull-down menus and text field entries.

Cartridge Heater Product Builder
Cartridge Heater Product Builder
(click for larger view)
The BCE "Mini Clean Flow Heater Builder" and the BCE "Cartridge Heater Builder" are easy to use web-based applications that offer users the ability to design a heater specifically for their application.

The user interface consists of an onscreen product drawing which is updated as each element of the design criteria is chosen. Once designed, it provides a finished drawing and allows the user to submit a pricing quotation request to BCE.

Mini Clean Flow Heater Product Builder
Mini Clean Flow Heater Product Builder
(click for larger view)
The product builders are intended to save customers time by providing an easy and convenient way to choose heater options and get a fast, accurate price quote.


For more information, contact BCE. Call them at 510-274-1990 or visit their website at https://bcemfg.com.

Friday, March 27, 2020

What Are Circulation Heaters?

Circulation HeaterCirculation heaters are the perfect solution for generating heat and enhancing normal immersion heaters performance. They are designed to heat pressurized circulating fluids and to provide effective, controlled heating to water, oil, steam and other gases. Circulation heaters are composed of all-in-one units with a heater mounted inside an insulated tank. They are made of a flanged or a screw plug immersion heater that is inserted into a pressure vessel or a pipe body. Heaters have inlet and outlet piping where the liquid or gas goes through the tank in order to reach the desired temperature.

KEY FEATURES

  • Standard sizes: 1.25” NPT screw plug size to 14” diameter
  • Steel vessels fitted with 150 lb. flanges
  • Thermal insulated vessels
  • Custom unit sizes: up to 44” nominal pipe size
  • Custom-designed to meet your specifications
  • Special sizes, wattages, and materials are available upon request
  • Units are available with larger vessels and heavier flanges
  • Supplied with stainless steel parts and special design terminal boxes use in high temperature conditions

BENEFITS

  • Easy to install
  • Compact
  • Clean
  • Durable
  • Highly energy efficient
  • Provide fast response and even heat distribution
  • Provide greater wattage in a smaller heater bundle
  • Provide maximum dielectric strength
  • Reduce heat loss from the vessel
  • Protect and prevent thermal insulation
  • Easy mounting support
  • Suitable to general purpose terminal enclosures, weather or moisture resistant terminal enclosures, and unsafe or explosion proof locations
  • Compatible with standard industry piping and safety standards
  • Designed and built for safety


FACTORS

Please consider the following factors in order to select the proper circulation heater:
  • Operating temperature
  • Heating element watt density
  • Sheath material (corrosive or non corrosive)
    • Temperature of the corrodent
    • Degree of aeration of exposed corrodent
    • Velocity of the corrodent  

REGISTRATION

Circulation heaters are sometimes considered as boilers or pressure vessels according to the:

  • Heated fluid
  • KW rating
  • Size of vessel
  • Operating pressure
  • Outlet temperature

Where applicable, registration requirements are imposed by law and according to the installation location.

EXTRA FEATURES

  • Available built-in high limit controls and thermostats
  • Standard built-in thermostats: Single pole device limited to 240V up to 30 amps
  • For heater voltage over 240V, or heater currents over 30 amps, or three-phase supply, the thermostat is used for pilot duty only and is not factory wired to the elements.

Please call BCE at 510-274-1990 if you have requirements for circulation heaters. You can also get additional information from the BCE website here.

Monday, February 24, 2020

Industrial and OEM Electric Heating Elements

Electric Heating Elements
Electric heating elements are used to provide localized heat for people, animals, and equipment. Because electricity is widely available, it's a logical source of energy for the creation of heat. Electricity is converted to heat by the resistance to electrical current flow by a conductor. This process is known as Joule heating or Ohmic heating. The transfer of heat from heating element to the workpiece needing to be heated is done through conduction, convection, or radiation. Electric heat is simple, clean, and efficient. Unlike other forms of energy to create heat, such as fossil fuel or nuclear sources, there are no concerns with flammable fuels, radioactive materials, or harmful by-products.

There are many places where electric heaters comes in touch with our lives each day. They are used to keep living spaces warm for human beings and animals (commonly referred to as "comfort heating"). Electric heating elements are found in common home appliances such as toasters, stoves, and hair dryers. But beyond the day-to-day consumer applications, electric heaters are also ubiquitous in industry. Industrial heating elements are critically important to many manufacturing processes, wether as an equipment component (OEM heaters), or directly used in the the processing of raw materials (industrial electric heaters).

In industry, electric heating elements are commonly used in the manufacture of electronics, semiconductors, medical devices, food equipment, plastics equipment, pharmaceuticals, glass, ceramics, primary metals, aerospace equipment, and HVAC equipment.   While the industries that use electric heaters vary widely, the application of electric heaters narrows to the heating of flowing fluids (which include gases and air) or the heating of a solid metallic, or non-metallic, workpiece.

Types of Electric Heaters Used in Industry and Original Equipment Manufacturing


While the modes of transferring heat from on body to another will always be conduction, convection, or radiation, the mechanical and physical properties of industrial heaters change dramatically, depending on the media being heated, the physical and limitations of the application, and the application's temperature requirements. The following are the most common types of industrial and OEM heating elements used.

Tubular Heating Elements

Tubular elements are a common form of electric heater. Essentially a metal tube with resistance wire and electrical insulation inside, tubular elements can be configured into almost uncountable shapes and sizes.

Cartridge Heating Elements

Cartridge heaters provide localized heat to restricted work areas requiring close thermal control. Dies, platens and a variety of other types of processing equipment are efficiently heated.

Flexible Heating Elements

Flexible Heaters are made from a variety of materials such as Silicone rubber, Kapton, Mylar, or Neoprene and have etched foil or wirewound resistance elements. Fast responding with excellent heating profiles, these heaters solve many tough equipment heating challenges. Custom shapes and terminations are designed to suit. Rapid prototype service available.


Ceramic Heating Elements

Composed of high temperature materials such as alumina ceramic substrates. The metal heating resistance element is thickfilm technology or wire.

Thick Film Heating Elements

A process of depositing a resistor “trace” of tungsten paste on top of a ceramic part in a process very similar to screen printing. The deposition process allows for close control of thickness and width of the resistor, thus accurately controlling the conductor resistance, wattage, watt density, and uniformity of the heated part.

Wednesday, January 8, 2020