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Industrial
Bench Ovens

BULLETIN
BH-302

RUGGED, VERSATILE
BENCH OVEN HANDLES
FLAMMABLE SOLVENTS


 

Model NBS-400 meets the requirements of OSHA and National Fire Protection Association Standard 86 for Class A ovens. Not for use in hazardous locations as defined in the National Electric Code.

These rugged bench ovens are designed for a wide variety of industrial heat processing applications including those where flammable solvents or vapors will be present in the oven.

STANDARD FEATURES Back to Top

— Recirculating blower
— 304 stainless steel interior
— Incoloy sheathed tubular heating elements
— Silicone rubber door gasket
— Analog, thermocouple actuated, temperature controller
— Adjustable, thermocouple actuated, manual reset excess
     temperature interlock
— On-off switch
— Red pilot light indicates heater operation
— Sturdy steel construction
— Brushed stainless steel exterior
— 6 lb/cf density industrial rockwool insulation
— Built-in baffles prevent radiant heat
— Fully factory tested
— 1 year limited warranty



MODEL NBS-400
Fan forced recirculation of heated air throughout 7 cubic foot work space at temperatures to 400°F. Includes two (2) removable nickel plated wire shelves easily adjustable on 2" centers. Holds a maximum of seven (7) shelves. Includes safety equipment required when flammable solvents or vapors are present in an oven.



 

   
SPECIFICATIONS Back to Top
Model
Work Space
Outside
Dimensions
(WxDxH)
Maximum
Temperature
Insu-
lation
Watts
Operating Characteristics†
Approx
Shipping
Weight
Dimensions
(WxDxH)
Volume
Cu Ft
Control
Accuracy
Oven
Uniformity
Rise Time
NBS-400 28" x 24" x 18" 7 41" x 30" x 39" 400°F 2" 4000 ±0.5°F ±10°F 40 min 300 lbs 
    †Uniformity at 50°F below maximum temperature. Rise Time in minutes
to 50°F below maximum temperature. Tests run with empty oven and
minimum exhaust. Performance will vary with load, exhaust rate and
application. See Bulletin TC-920 for additional details.
 
STANDARD EQUIPMENT   Back to Top
Standard Electrical Characteristics
— 208 volts, 1-phase, 60 Hz
— 230 volts, 1-phase, 60 Hz
— Other electrical characteristics available
 
MODEL NBS-400

Completely wired control panel assembled on the oven enclosing the temperature controller, manual reset excess temperature interlock, pilot light to indicate when heaters are energized and on-off switch. Includes additional safety equipment required by OSHA and NFPA 86 for Class A ovens. Will handle a maximum of 3 ounces (0.024 gallons) of flammable solvents or vapors per batch at a maximum temperature of 400°F.


Manual Reset Excess Temperature Interlock
Turns off heat if oven exceeds 400°F.

Back-Up Heating Element Relay
Turns off oven heat on excess temperature controller actuation in the
event of failure of the primary heating element relay


35 CFM Separately Powered Forced Exhauster
Provides safety ventilation. Exhaust outlet 4" diameter.


Exhauster Air Flow Safety Switch
Turns off oven heat if exhauster fails


Recirculating Blower Air Flow Safety Switch
Turns off oven heat if recirculating blower fails


Purge Timer
Provides time delay to allow exhauster to pull four oven volumes of
air through the oven prior to turning oven heat on

 

 

 

 

 


Circulation Diagrams
(Front View)

 







 

 

 

 


 
Digital Timing Temperature Controller, microprocessor based, digital indicating, incorporates 99 hour 59 minute timer. Starts timing when temperature reaches set point and shuts down oven heat at end
of set time.
Option DTS2

Programmable Temperature Controller
, microprocessor based, digital indicating, thermocouple actuated, in lieu of standard controller.
Option PTC2

Recording Thermometer, thermocouple actuated, 24-hour, 10" diameter circular chart, in conjunction with standard controller (side mounted).
Option RT

Shut Down Timer, with continuous "hold" feature
60 minute range.
12 hour range.
Option BTMR60
Option BTMR12

 
ADDITIONAL EQUIPMENT AVAILABLE Back to Top
Additional Shelves, 20 lbs distributed load per shelf, 40 lbs maximum oven load, specify oven model when ordering.

 

Set of Eight (8) 304 Stainless Steel Drying Pans,
11 1/2" W x 20" D x 2" H (NB Models only, requires two (2) add'l shelves).

Option NBPN3

Oven Stand, raises unit to convenient 31" work level Shipped separately, requires assembly.
Option STNDNB

Dial Thermometer
10-290°C, 50-550°F dual scale range
Option T550F

Digital Indicating Temperature Controller,
microprocessor based, thermocouple actuated, in lieu of standard controller.
Option DIG2

 

 
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