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Laboratory Ovens

Economical Model LO, LR, LW

Not For Use with Flammable Solvents or Vapors

Low cost, fully equipped, all purpose laboratory ovens for sample drying, baking, annealing, conditioning, sterilizing, evaporating and dehydrating, and other general laboratory work.

Fully factory tested
Sturdy welded steel construction
Full length continuous hinge
Thermostatically controlled
Over-temperature protection
3-wire cord and plug standard on 120 volt models
2 nickel plated shelves adjustable at 1/2" increments

Damper controlled gravity air circulation
Red pilot light to indicate heater action
Incoloy sheathed tubular heating element
Brushed stainless steel exterior
Corrosion resistant aluminized steel interior
6 lbs/cf density industrial rockwool insulation
On/off switch & Mercury thermometer

Model LO-201C

Model LR-271C

Model LW-201C

The LO-201C is a compact and economical unit. It has a work space that measures 12" wide x 10" deep x 10" high. Temperatures to 200°C (392°F).

Used where larger work space & higher temps. are required. Resilient silicone rubber door gasket. Work space measures 13" wide x 13" deep x 13" high. Temperatures to 270°C (518°F).

Largest laboratory oven affording more than twice the capacity of the LO-201C. Work space, 18" wide x 12" deep x 16" high. Temperatures to 200°C (392°F).

Standard Equipment

■ Standard Electrical Characteristics:
— 120V , 50-60 Hz, 3-wire cord and plug
— 240V, 50-60 Hz, 3-wire cord (Can be operated on 208 volts. Heat input will be reduced by 20%.)

■ Standard Temperature Control System
Models LO-201C and LW-201C
Bimetal control thermostat sets desired oven temperature. Thermal cutoff limits maximum oven temperature. Red pilot light indicates heater operation. Top mounted mercury thermometer.
Model LR-271C
Primary hydraulic control thermostat sets desired oven temperature. Second manual reset hydraulic thermostat limits maximum oven temperature. Red pilot light indicates heater operation. Top mounted mercury thermometer.

■ Gravity Convection
All Models
Heat is transferred from the bottom up through the oven chamber by natural convection and exits through vents in the oven top. Adjustable fresh air inlet damper at the oven bottom provides control of the amount of fresh air entering the oven.

NOT FOR USE WITH FLAMMABLE SOLVENTS OR VAPORS. OTHER MODELS AVAILABLE FOR THESE APPLICATIONS—PLEASE CONSULT US.

Available items


Order Number:	OV-LO-201C	OV-LW-201C	OV-LR-271C
Work Space Dimensions:	12"x 10"x 10"	18" x 12"x 16"	13"x 13"x 13"
Volume (Cu Ft):	0.7	2	1.3
Outside Dimensions:	14"x 12"x 19"	20"x 14" x 25"	17"x 17-3/8"x 24"
Maximum Temperature:	200°C	200°C	270°C
No. of Shelves:	2	2	2
Insulation:	1"	1"	2"
Watts:	800	1600	800
Weight Approx.:	39 lbs	66 lbs	66 lbs

120V or 240V Available
Addt'l Shelves: *15 lbs. distributed load per shelf. 30 lbs. maximum oven load. Each additional shelf includes four (4) support clips.

Bench Ovens

Model NBS-400

For Flammables

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

Manual reset excess temperature controller 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
30 CFM separately powered forced exhauster provides safety ventilation
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.

Model NBS-400

MODEL NBS-400 - shown with optional shelves.
16” x 8” x 12” exhaust hood not shown

All the features of Model NB-400 combined with the safety equipment required when flammable solvents or vapors are present in an oven. Model NBS-350 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.

Same as Model NB-400, plus additional safety equipment required by OSHA and NFPA 86 for Class A ovens. Will handle a maximum of 3 oz. (0.024 gallons) of flammable solvents or vapors per batch at a maximum temperature of 400°F.

Note: Model NB-350 is NOT for use with flammable solvents or vapors — use Model NBS-400, which includes additional safety equipment required by OSHA and NFPA 86 for handling a maximum of 3 oz. (0.024 gallons) of flammable solvents or vapors per batch at a maximum temperature of 400°F.

Available items


Order Number:	OV-NBS-400
Work Space Dimensions:	28"x 24"x 18"
Volume (Cu Ft):	7
Outside Dimensions:	41"x 30"x 23"
Maximum Temperature:	400°F
Insulation:	2"
Watts:	4000
Weight Approx.:	240 lbs

230V Available, 115V Not Available
Optional Shelves Available

Forced Convection Bench Ovens

Economical ovens easily moved to various locations. For processing large parts, baking, drying components after cleaning, dehydration, preheating, curing and other applications requiring circulation of heated air.

Recirculating blower
430 stainless steel interior
Incoloy sheathed tubular heating elements
6 lb/cf density industrial rockwool insulation
Sturdy welded steel construction
Calibrated temperature controller
Manual reset excess temperature controller

On-off switch
Red pilot light indicates heater operation
Baked enamel exterior finish
Silicone rubber door gasket
3-wire cord and plug on 115 volt model
Fully factory tested
1 year limited warranty

Model NB-350

Provides 7 cubic feet of work space at temperatures to 350°F. Includes two (2) removable nickel plated wire shelves easily adjustable on 2" centers. Holds a maximum of seven (7) shelves.

Widely used for drying small items, preheating plastics, drying powdered metals, and curing potting compounds. Double doors for easy loading of large parts.

Model NB-550

Similar to Model NB-350. Also includes two (2) shelves and will hold a maximum of seven (7) shelves. Provides over 5 cubic feet of work space at temperatures to 550°F. Ideal for high temperature processes such as annealing springs and plated parts.

Model DR-350

Specially designed for processing and drying of plastic granules, powdered metal parts and other small parts that must be separated. Eight (8) individual 430 stainless steel drawers keep parts separated and allow individual inspection or removal without opening conventional doors. This reduces heat loss and prevents process interruption.

Temperatures to 350°F. Standard drawers have 3/4" diameter perforations on 1-1/4" staggered centers on bottom and sides. Solid drawers also available.

• Standard Electrical Characteristics
—115V, 60 Hz, 3-wire cord with plug
—208V, 1-phase, 60 Hz
—230V, 1-phase, 60 Hz
—Other Electrical Characteristics Available

• Standard Temperature Control System
Calibrated main temperature controller regulates desired oven temperature. Independent manual reset excess temperature controller protects against failure of main temperature controller. On-off switch located on panel controls electrical power to oven. Red pilot light indicates heater operation.

Available items


Order Number:	OV-NB-350	OV-NB-550	OV-DR-350
Work Space Dimensions:	28"x 24"x 18"	26" x 22"x 16"	8 Drawers ‡
Volume (Cu Ft):	7	5.3	4.8
Outside Dimensions:	41"x 30"x 23"	41"x 30" x 23"	41"x 30" x 23"
Maximum Temperature:	350°F	550°F	350°F
Insulation:	2"	3"	2"
Watts 115V*/208V&230V:	2000/2000	2400/3000	2000/2000
Weight Approx.:	210 lbs	235 lbs	285 lbs

* Model NB-550 requires 30 ampere service on 115 volts.
‡ Eight (8) individual 430 stainless steel drawers each 11-3/4"W x 25"D x 2"H (3-1/2" total height clearance). Perforated metal bottoms and sides standard, solid bottoms and sides available at no additional cost.
§15 lbs. distributed load per shelf. 30 lbs. maximum oven load. Each additional shelf includes four (4) support clips.

Additional Equipment Available


Item
• Mercury Thermometer
	NB-350 & DR-350, 0-400°F Range
	NB-550, 0-600°F Range
• Set of Eight (8) 430 Stainless Steel Drying Pans, 11-1/2"W x 20"D x 2"H (NB Models only, requires two (2) addt'l shelves)
• Oven Stand, raises unit to convenient 31" work level (Shipped separately, requires assembly)
• Exhaust Chamber Adapter, to fit standard 3" stove pipe (Shipped separately, requires assembly)
• Digital Indicating Temperature Controller, microprocessor based, thermocouple actuated, in lieu of standard controller
• Digital Indicating Temperature Controller with Digital Timing System*,microprocessor based, thermocouple actuated temperature controller incorporating 99 hour 59 minute range timer. Starts timing when temperature reaches set point and shuts down oven heat at end of set time. Blower continues to operate
• Programmable Temperature Controller, microprocessor based, digital indicating, thermocouple actuated, in lieu of standard controller
• Recording Temperature Controller, thermocouple actuated, 24-hour, 10" diameter circular chart, in lieu of standard controller
• Programmable Recording Temperature Controller, microprocessor based, thermocouple actuated, digital display, 24-hour, 10" diameter circular chart, in lieu of standard controller
• Shut Down Timer, with continuous "hold" feature
	60 minute range
	12 hour range

*Requires completion of User Information Sheet

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Paul N. Gardner Company, Inc. • Phone 1.800.762.2478 • Fax 954.946.9309