21060 Corsair Blvd. Hayward, CA 94545

Vacuum Feedthroughs, Heating Elements, and Custom Thermal Systems for
Aerospace, University Research, Semiconductor, Medical and OEM Applications

HEM Sealed Heater™

HEM Sealed Heater Heater

OPTIMIZING LIQUID FLOW IN LAUNCHES

Patch or polyimide heaters can be used in custom shapes for space travel, however hermetically sealed cartridge heaters are often used to heat blocks of material or components requiring high temperature. Monopropellant rockets depend on the use of a wire-wound resistor enclosed in a metallic sheath using a ceramic insulator for dielectric strength. A reamed hole is then typically drilled into the rocket engine component and a clamp or flange is welded on to the sheath of the heater.


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. The BCE Hem Sealed Heater™ outperforms as heat flows uniformly from inside the cartridge directly to the heated bodies.


Features

  • Easy mounting of heaters into manifolds and valve bodies
  • Mounting to be compatible with standard hardware
  • 6 to 36V electrical specifications
  • Resistance tolerance to be +/-5%
  • < 1,500 VDC or greater on the Hi-pot test
  • < 4,000 Megohm at 500 to 1000 VDC on the Megohm test
  • < .010 sheath thickness
  • Sheath can be Inconel or 300 series stainless material
  • Sealing Epoxy to meet NASA ASTM E595 Low Outgassing Standard
  • Maximum operating temperature of heater <200°C 
HEM Sealed Heater StockClick image to open PDF of Size and Wattage Availability

Controlling the heater typically falls to the command of the either a thermostat or solid-state relay turning the heater on when needed at temperatures that have been determined prior to the rocket launch. Satellites control heaters using an onboard computer to monitor temperatures turning them off and on at the optimal time. A common use is heating up a catalyst bed on a monopropellant thruster to around 100°C prior to the rocket engines being engaged.

Most applications utilizing the Hem Sealed Heater® also require an automatic control of the heater to allow the unit to maintain the desired temperature. Mechanical thermostats are the most common device, which can be incorporated into the Hem Sealed Heater® using additional metallic tubing and hermetically sealing the control section with BCE’s proprietary epoxy.

The spacecraft heater application will be solved utilizing one interconnected component set at the optimal temperature. Ask BCE to assist in your rocket engine design.

Drawing


BCE Engineering & Quality Assurance

BCE engineers provide decades of experience in design and development, delivering a wealth of empirical data and experience. BCE welcomes your custom requirement and will design and deliver a part that meets your challenging needs.

BCE is recognized for its commitment to quality and excellence by being certified in accordance with ISO 9001:2015.
ISO 9001
 

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21060 Corsair Blvd. Hayward, CA 94545 | (510) 274-1990
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