February 21, 2012

No. 855 is a 1250°F (676.6°C) electrically-heated, inert atmosphere cabinet oven from Grieve. Workspace dimensions on this oven measure 38″ wide x 26″ deep x 38″ high. 40 KW are installed in Incoloy sheathed tubular elements to heat the oven chamber, while a 1500 CFM, 1-1/2 HP recirculating blower provides horizontal airflow to the workload.

This Grieve cabinet oven features 10″ insulated walls comprising 2″ of 1900°F block and 8″ of 10 lb/cf density rockwool insulation. Type 304, 2b finish stainless steel interior with continuously back-welded seams, plus inner and outer door gaskets with the gasket sealing directly against the door plug while the outer gasket seals directly against the face of the oven.

Full inert atmosphere construction includes a pressure regulator, flow meter, pressure gauge, internal high-temperature gasket, all welded expansion connection in doorway throat, air jacket on inner oven for cooling, 1/2″ thick silicone rubber atmosphere seal, blower shaft seal, positive latching door hardware, adjustable offset door hinges, outlet with pressure relief, interior seams welded gas-tight and all wall penetrations fitted with compression fittings. A 325 CFM blower pulls air through the jacket on the inner oven for cooling.

Controls on No. 855 include a special heating/cooling temperature controller to control heating elements for heating and modulating damper on cooling blower for cooling. The oven also has an SCR power controller and a circular chart recorder.