Inert Atmospheric Ovens

Bulletin CA-470


Inert atmosphere ovens for operation at up to 4000C. Protect parts from oxidation using any non-flammable gas such as Nitrogen, Argon or Carbon Dioxide. Front to back horizontal airflow completely surrounds work on shelves or large parts placed directly on the optional reinforced workspace bottom. Includes cooling jacket, which can be equipped with optional cooling atmosphere purge solenoid, cooling blower and programming temperature controller provides completely automatic sequencing.



  • Digital, microprocessor based, thermocouple actuated, indicating temperature controller
  • Motor control push buttons
  • On-off heat switch
  • Easy-to-see pilot lights

Safety Equipment

  • Adjustable, thermocouple actuated, manual reset excess temperature controller
  • Separate heating element control contactors
  • Re circulating blower air flow safety switch.


  • All interior seams welded gas-tight
  • All wall penetrations welded at inside and fitted with compression fitting at outside of oven.
  • Inner oven walls extended through oven throat area to seal directly against silicone rubber door seal
  • 2-point cam action positive latching door hardware
  • Adjustable offset door hinges to guarantee tight closure of door seal
  • Exterior blower shaft seal
  • Inert atmosphere inlet with pressure regulator to maintain positive pressure within oven
  • 0-100 CFH atmosphere flow meter
  • Pressure gauge to indicate interior oven pressure
  • Inert atmosphere outlet with pressure relief
  • Air jacket on inner oven for cooling
  • 304 stainless steel interior
  • Aluminized steel exterior with enamel finish
  • Brushed stainless steel control panel face
  • 10 lbs./cf. density industrial rock wool insulation
  • Built-in baffles prevent radiant heat
  • Two (2) nickel plated wire shelves
  • Channel shelf supports prevent shelves tipping
  • 1 year limited warranty
Every oven fully assembled and individually factory tested


Work Space
Max Temp
Operatin Characteristics
 (W x D x H)
 (W x D x H)
Control Accuracy Oven Uniformity Rise time Electric
LA- 275 24" x 24" x 24" 38" x 48" x 34" 2750C 400 1/3 4" 9 + 0.3% + 50C 23 min
LA- 400 24" x 24" x 24" 42" x 52" x 38" 4000C 400 1/3 6" 12 + 0.3% + 50C 46 min
IB- 275 24" x 36" x 24" 38" x 60" x 34" 2750C 400 1/3 4" 9 + 0.3% + 50C 30 min
IB- 400 24" x 36" x 24" 42" x 64" x 38" 4000C 400 1/3 6" 12 + 0.3% + 50C 57 min
IC- 275 36" x 36" x 36" 50" x 58" x 46" 2750C 600 1/2 4" 9 + 0.3% + 50C 39 min
IC- 400 36" x 36" x 36" 54" x 62" x 50" 4000C 600 1/2 6" 12 + 0.3% + 50C 55 min
ID- 275 36" x 48" x 36" 50" x 70" x 46" 2750C 600 1/2 4" 9 + 0.3% + 50C 52 min
ID- 400 36" x 48" x 36" 54" x 74" x 50" 4000C 600 1/2 6" 12 + 0.3% + 50C 73 min

Specifications subject to change without prior notice


- 230 volts, 3-phase, 50 Hz
- Other electrical characteristics available
Each features completely wired, top access control panel enclosing terminals for incoming power, temperature controllers, push buttons and pilot lights. Motor starter and heating element contractors electrically interlocked to shut off heaters if power is interrupted and to permit operation of blower without heat of cooling. Incoloy sheathed tubular heating elements
Two (2) reinforced 100 lbs. uniformly distributed load capacity, nickel-plated wire shelves. 304 stainless steel interior and Trilite Green enamel painted aluminized steel exterior.
Inert atmosphere is introduced at blower shaft (½" NPT) and positive oven pressure maintained by inlet pressure regulator. Atmosphere flow indicated on 0-100 CFH flow meter. Oven pressure indicated on 0-2" water column pressure gauge. Continuously welded inner oven construction with compression fittings at wall penetrations maintains atmosphere integrity. Atmosphere outlet equipped with pressure relief, which can be manually opened to increase inert gas flow for initial purge of air from oven. Adjustable positive latching door hardware and offset hinges assures positive door seal


  • Additional Shelves, 100 lbs. distributed load per shelf, 400 lbs. maximum oven load, specify oven model when ordering.
  • Programmable Temperature Controller, microprocessor based, digital indicating, thermocouple actuated, in lieu of standard controller ........... PTC3
  • Recording Thermometer, thermocouple actuated, 24-hour, 10" diameter circular chart used in conjunction with standard controller (side mounted)..............................................................................................................RT
  • Programmable Recording Temperature Controller, microprocessor based, thermocouple actuated, digital display, 24-hour, 10" diameter circular chart, in lieu of standard controller (side mounted).................. PRTC3
  • Digital Timing System, incorporated into standard temperature controller, 99 hour 59 minute range, starts timing when temperature reaches set point and shuts down oven at end of set time .......... DTS3
  • Shut Down Timer, with continuous "hold" feature 1,5,10 or hour range..............STD
  • Batch Timer, for uniformly timing batch operations. Continuous alarm with door interlock; alarms at end of preset time period until door is opened or timer reset. 1,5,10 or 30 hour range........................BT
  • Automatic Door Switch turns off blower and heat when door is opened. Restores blower and heat when door is closed...........ADS
  • 24" Integral Oven Legs, with 1/8" steel plate shelf. Specify oven model when ordering.
  • 24" Removable Oven Stand, with 1/8" steel plate shelf, Specify oven model when ordering..........RSTND
  • 500 Ibs Capacity Carbon Steel Subway Grating, oven workspace bottom. Reduces workspace height by 1". Specify oven model when ordering....................SUB
  • Automatic Purge Solenoid, opens oven outlet automatically to purge air from oven, requires installation of optional programmable temperature controller................................APS
  • Cooling Blower, connected to air jacket to provide accelerated cooling, includes two position motorized dampers, requires installation of optional programmable temperature controller.............CB
  • Modulating Dampers, to regulate cool down rate replaces two position dampers included with cooling blower. Includes heating/cooling programmable temperature controller in lieu of optional programmable temperature controller required with cooling blower.......................MD
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