High Temperature
Inert Atmosphere
Ovens

BULLETIN
CA-480

1000°F AND 1250°F
FRONT-TO-BACK
HORIZONTAL AIR FLOW
INERT ATMOSPHERE OVENS

 

Inert atmosphere ovens for operation at up to 1250°F. Protect parts from oxidation using any non-flammable gas such as Nitrogen, Argon or Carbon Dioxide. Front-to-back horizontal air flow completely surrounds work on shelves or large parts placed directly on the optional reinforced work space bottom. Includes cooling jacket which can be equipped with optional cooling blower and automatic dampers. Installation of optional atmosphere purge solenoid, cooling blower and programmable temperature controller provides completely automatic sequencing.

STANDARD FEATURES Back to Top
• UL LISTED CONTROL PANEL
• Standard Universal Ovens from Grieve meet the requirements of National Fire Protection Association Standard 86, Industrial Risk Insurers, Factory Mutual and OSHA standards. For some applications, such as those involving flammable solvents or hazardous locations, the above organizations require additional safety devices.

• Controls
— Digital, microprocessor based, thermocouple actuated, indicating temperature controller
— Motor control push buttons
— On-off heat switch
— LED pilot lights

 • Safety Equipment
— Adjustable, thermocouple actuated, manual reset excess temperature controller
— Separate heating element control contactors
— Recirculating blower air flow safety switch

• Construction
—All interior seams welded gas-tight
—All wall penetrations welded at inside and fitted with compression fitting at outside of oven
—Silicone rubber atmosphere seal at outside perimeter of oven door
—High temperature inner door gasket with stainless steel spring insert to seal heat in oven and protect atmosphere 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
—0-200 CFH atmosphere flow meter
—Pressure gauge to indicate interior oven pressure
—Inert atmosphere outlet with pressure relief
—Air jacket on inner oven for cooling
—Front-to-back horizontal air flow
—16 gauge 304 stainless steel interior
—Aluminized steel exterior with enamel finish
—Brushed stainless steel control panel face
—Insulated with 2" thick 1900°F insulating block, backed up with 10 lbs/cf density industrial rockwool
—Built-in baffles prevent radiant heat
—Two (2) stainless steel wire shelves
—Channel shelf supports prevent shelves tipping
—1 year limited warranty

 • Every oven fully assembled and individually factory tested

 
 
   
SPECIFICATIONS Back to Top
NOT FOR USE WITH FLAMMABLE SOLVENTS, VAPORS OR GASES.
Model
Workspace
Outside
Dimensions*
(WxDxH)
Max
Temp
Blower
Insu-
lation
Doors
kW
Operating Characteristics†
Approx
Shipping
Weight
Dimensions
(WxDxH)		 Volume
Cu Ft		 CFM HP Control
Accuracy		 Oven
Uniformity		 Rise Time
IA-1050 24" x 24" x 24" 8 53" x 60" x 47½" 1050°F 400 1/3 10" Single 12 ±0.3% ±10°F 80 min 2445 lbs 
IA-1250 24" x 24" x 24" 8 57" x 64" x 51½" 1250°F 400 1/3 12" Single 18 ±0.3% ±13°F 90 min 2815 lbs 
IB-1050 24" x 36" x 24" 12 53" x 72" x 47½" 1050°F 400 1/3 10" Single 12 ±0.3% ±10°F 100 min 2740 lbs 
IB-1250 24" x 36" x 24" 12 57" x 76" x 51½" 1250°F 400 1/3 12" Single 18 ±0.3% ±13°F 111 min 3265 lbs
IC-1050 36" x 36" x 36" 27 65" x 70" x 59½" 1050°F 600 1/2 10" Single 18 ±0.3% ±10°F 115 min 3475 lbs
IC-1250 36" x 36" x 36" 27 69" x 74" x 63½" 1250°F 600 1/2 12" Single 24 ±0.3% ±13°F 129 min 4240 lbs
ID-1050 36" x 48" x 36" 36 65" x 82" x 59½" 1050°F 600 1/2 10" Single 18 ±0.3% ±10°F 140 min 4410 lbs
ID-1250 36" x 48" x 36" 36 69" x 86" x 63½" 1250°F 600 1/2 12" Single 24 ±0.3% ±13°F 170 min 4845 lbs
*All Models— Control panel overhang 9" right side. Blower motor overhang 18" rear
. 		†Accuracy as percent of controller span. Uniformity at 100°F below maximum temperature. Rise Time in minutes to 100°F below maximum temperature. Tests run with empty oven and minimum exhaust. Performance will vary with load and application. See Bulletin TC-920 for additional details.
STANDARD EQUIPMENT   Back to Top
• All Models
— 208 volts, 3-phase, 60 Hz
— 230 volts, 3-phase, 60 Hz
— 460 volts, 3-phase, 60 Hz
— Other electrical characteristics available

Each features completely wired, top access UL listed control panel enclosing terminals for incoming power, temperature controllers, push buttons and pilot lights. Motor starter and heating element contactors electrically interlocked to shut off heaters if power to blower is interrupted and to permit operation of blower without heat for cooling. Incoloy sheathed tubular heating elements. The 1250°F models have a heat chamber high limit controller.

Two (2) reinforced 100 lbs uniformly distributed load capacity, stainless steel wire shelves. Models IA and IB will hold seven(7) shelves on 3" centers; models IC and ID five(5) shelves on 6" centers.

 


 Trilite Green enamel painted aluminized steel exterior. Insulated with 2" of 1900°F insulating block backed up with 1250°F industrial rockwool.

Inert atmosphere is introduced at blower shaft (1/2" NPT) and positive oven pressure maintained by inlet pressure regulator. Atmosphere flow indicated on 0-200 CFH flow meter. Oven pressure indicated on 0-5 inch 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 assure positive door seal. The inner high temperature gasket seals directly against the door plug; outer atmosphere gasket seals against the front face of the oven.

Circulation Diagrams
(Front View)

 








• Automatic Purge, opens oven outlet automatically to purge air from oven, requires installation of optional programmable temperature controller
Option APS

 • Cooling Blower, connected to air jacket to provide accelerated cooling, includes 2-position motorized dampers, requires installation of optional programmable temperature controller
Option CB
Oven
Model
Capacity
HP
Outlet
Dia
Approx Cooling
to 250°F from
500°F 750°F
IA 325 CFM 1/3 6" 95 min 110 min
IB 650 CFM 1/2 6" 60 min 70 min
IC 975 CFM 1 8" 80 min 100 min
ID 975 CFM 1 8" 110 min 130 min

• Modulating Dampers, to regulate cool down rate, replaces 2-position dampers included with cooling blower. Includes heating/cooling programmable temperature controller in lieu of optional programmable temperature controller required with cooling blower
Option MD 

 
ADDITIONAL EQUIPMENT AVAILABLE Back to Top

See Bulletin TC-960 for modifications and other optional equipment.

• 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
Option PTC3

• Recording Thermometer, thermocouple actuated, 24-hour, 10" diameter circular chart used in conjunction with standard controller
Option RT

• Programmable Recording Temperature Controller, microprocessor based, thermocouple actuated, digital display, 24-hour, 10" diameter circular chart, in lieu of standard controller
Option PRTC3

• Digital Timing Temperature Controller, microprocessor based, digital indicating, incorperates 99 hour 59 minute timer. Starts timing when temperature reaches set point and shuts down oven at end of set time
Option DTS3 
• Shut Down Timer, with continuous "hold" feature; 1, 5, 10 or 30 hour range
Option SDT  

• Batch Timer, for uniformly timing batch operations. Continuous alarm with door interlock; alarms at end of preset period until door is opened or timer reset; 1, 5, 10, or 30 hour range
Option BT

• Automatic Door Switch, turns off blower and heat when door is opened. Restores blower and heat when door is closed
Option ADS

• Integral Oven Legs, with 1/8" steel plate shelf. 24" high on IA and IB Series, 16" high on IC and ID Series
Option ISTND

• Removable Oven Stand, with 1/8" steel plate shelf. 24" high on IA and IB Series, 16" high on IC and ID Series
Option RSTND

• 500 lbs Capacity Carbon Steel Subway Grating, oven work space bottom. Reduces work space height by 1". Specify oven model when ordering.
Option SUB 
 
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Specifications Subject to Change Without Notice
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