Blue M Class A Batch Ovens

Blue M Class A batch ovens are mechanical convection electric chambers that include safety features recommended in NFPA Bulletin 86.

General Class A Batch Oven Specifications

Temperature range: +15°C above ambient to + 316°C (600°F)
Runup time: (no load) to + 316°C: 90 minutes (depending on exhaust)
Control accuracy: 0.5% of span

The industrial batch oven design has exceptional exhaust capabilities for handling solvents. The design of the chamber concedes that the element temperature may be greater than the auto-ignition point of some flammable materials,  but a high exhaust rate mitigates the auto-mitigation risk by maintaining a non-explosive mixture. A negative pressure is maintained in the work chamber that insures that all hazardous vapors will be expelled through the exhaust duct and not through the oven door, blower shaft seal or other apertures.

These ovens are complete systems. No additions are required to meet the recommendations of NFPA Bulletin 86 for processing hazardous work loads.

These Class A industrial batch ovens have Pro-Tronix I solid-state digital indicating control with time proportioning zero crossover performance. Setting and indication accuracy is 1/2%. Large LED display indicates both setpoint and actual chamber temperature at the touch of a button. Separate F.M. approved indicating type instrument provides overtemperature protection.

Class A Industrial Batch Oven Construction Features

• All welded housings are made from reinforced heavy gauge cold rolled steel.
• Chamber interiors are made of heavy gauge steel with high temperature aluminum finish. Welded construction prevents seepage and the build up of potentially dangerous material between chamber walls.
• Fiberglass insulation is used on all sides of the chamber and doors.
• Silicone sealed steel doors have welded and insulated double-wall construction.
• Smaller units have one door. Units 48" wide have two doors but no center mullion.
• Eterna heater banks are cylindrical and designed to provide years of service.
• Direct drive motor / blower system is electrically interlocked to prevent heater circuit from energizing unless blower is operating.
• Forced exhaust system maintains negative pressure inside the chamber improving the exhaust of hazardous vapors. Dampers at the chamber intake and forced exhaust intake are factory-set to meet individual chamber exhaust requirements, as determined by customer's application. Airflow switch stops heaters in the event of airflow loss.
• Adjustable purge / timer door switch can be set (1 to 55 minutes) to provide a minimum of four complete air changes before heaters are energized. Timer automatically resets and re-purges if power fails or cycle is interrupted. Actual time setting is a function of quantity of solvent and process temperature. This setting is established in the factory based on customer requirements.
• Factory settings are indicated on each unit. Any change must be made by a qualified safety engineer.
• Blow-out relief panel has a safety cage. It is installed in the rear wall. Panel area is one square foot per 15 cubic feet of oven volume in accordance with NFPA Bulletin 86.
• Fire extinguishing port is 2" in diameter and located on the rear wall. Provided for customer's installation of a fire extinguishing system that meets local fire code requirements.
• Wiring conforms to N.E. Code. All safety circuits are 120 volts supplied through a transformer with grounded secondary. A fused disconnect switch is supplied on unit for main power disconnect and single point power connection.
• Angle shelf supports are provided every 4" or 6" depending on model.
• Optional Slotted Shelves for three larger models are made of heavy steel angle iron framing and expanded metal.
• Optional 10" electronic recorder with circular chart instrumentation is available for recording operational performance.
• Optional Pro-Master I program control microprocessor-based (1/4 din) programmable PID control with eight program/six segment per program capability; each segment with ramp and soak. Display resolution from 0.1 to 1.0°C or F. Process alarm, deviation alarm. (RS 422/485 optional.)