Fisher Scientific 285A User manual

Model 285A Vacuum Oven
Catalog No. 13-262-285A and 13-262-286A
102505FS • 2/5/10 Serial Number________________________

Introduction..........................................................................................................................................................3
Alert Signals..................................................................................................................................................3
Performance and Physical Data..........................................................................................................................4
Unpacking ..........................................................................................................................................................5
Control and Indicator Description........................................................................................................................6
Operation ............................................................................................................................................................7
Preparing the Oven ......................................................................................................................................7
Temperature Adjustment ..............................................................................................................................7
Operation in a Static Environment................................................................................................................8
Operation in a Controlled Environment ........................................................................................................8
Operation in a Vacuum Environment............................................................................................................8
Vacuum Sealing Agents................................................................................................................................9
Out Gassing..................................................................................................................................................9
Precautions ..................................................................................................................................................9
Maintenance ......................................................................................................................................................11
Cleaning Suggestions ................................................................................................................................11
Periodic Maintenance..................................................................................................................................11
Gasket Replacement ............................................................................................................................11
Accessories and Replacement Parts ................................................................................................................12
Accessory Items ........................................................................................................................................12
Replacement Parts ....................................................................................................................................12
Schematics........................................................................................................................................................13
Warranty ............................................................................................................................................................16
2
Table of Contents

Before operation always observe the following safety pre-
cautions:
• This unit is not explosion proof.
• Do not use in the presence of flammable or
combustible materials; fire or explosion may
result. Unit contains components that may ignite
such materials.
• Do not place volatile items in the chamber.
• Fumes and spillage from acidic solutions cause
corrosion of the stainless steel chamber.
• Care should be taken to maintain neutral p at
all times.
3
Introduction
Warning
Before operation, read this manual
carefully and become familiar with
the operation of the oven before
use. Always observe the safety pre-
cautions throughout this manual.
Warning
Warnings alert you to a possibility of per-
sonal injury.
Caution
Cautions alert you to a possibility of
damage to the equipment.
Note
Notes alert you to pertinent facts and
conditions.
Hot Surface
ot surfaces alert you to a possibility of
personal injury if you come in contact
with a surface during use or for a period
of time after use.
Alert Signals

4
ModelNo.......................................................................285A
Catalog No. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-262-285A (120V), 13-262-286A (240V)
Vacuum Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Atmosphere to 30" g.* with adequate pump
VacuumLeakRate..................................................<.2” gper24hours
TemperatureRange ..............................................Ambient+10°Cto200°C
ShelfCapacity..................................................................4.1ft2
InsideDimensions ...................................................19”Dx12”Wx12”
OutsideDimensions...............................................25”Dx22.5”Wx23.5”
Standard Electrical Service . . . . . . . . . . . . . . . . . . . . . . . . . 1700 Watts, 120 VAC, 50/60 z, 14.2 Amps
Optional: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1700 Watts, 240 VAC, 50/60 Z, 7.1 Amps
NetWeight(Pounds)............................................................130lb.
* within 10 Micr ns
Performance and Physical Data

Refer to the unpacking checklist for the list of accessories
sent with this unit. Make certain you have all accessories
before destroying the shipping container and packing
material. Also verify that all packing material and tape
has been removed from inside the oven before operating.
Unpacking Checklist
Qty Description
1 Model 285A Vacuum Oven
1 Instruction Manual (PN 102505)
1 Vacuum Grease Tube
2 Shelf Trays
1 Warranty Card
If any of these items are missing from the carton, contact
Fisher Scientific.
Before operating the vacuum oven, the user should
ensure that all packing material has been removed from
the interior of the chamber.
5
Unpacking

6
1. Power Switch: Applies power to the oven tem-
perature control.
2. Temperature Control: Regulates the oven
operating temperature.
3. Heating In icator: Indicates when the oven is
being heated.
4. Thermometer: 0°C - 200°C dial thermometer
with 2° divisions.
5. Vacuum Gauge: Indicates chamber vacuum in
inches of mercury.
6. Control Valves: Used for evacuating chamber,
controlling vacuum, or for bleeding air and other
gasses into chamber.
7. Port: One inch port located on the back of oven,
for attachment to a high capacity vacuum sys-
tem for quick evacuation of oven.
Control and Indicator Description
5
6
4
231
6

Preparing the Oven
1. Place the oven on a bench or stand at a con-
venient working height. Maintain a minimum of
12 inches of clearance between the oven and
any combustible surfaces.
2. Turn temperature control to low position and
turn power switch off.
3. Check voltage and watts stamped on the data
plate for compatibility before connecting oven to
power source. The data plate can be found
near the power cord.
4. Connect a vacuum pumping system, including a
suitable trap, to the serrated fitting on the valve
designated as vacuum. Use 1/4” ID heavy
walled tubing and secure the connection with a
hose clamp.
5. If desired, connect a purge gas supply to the
remaining serrated fitting. Use a two stage gas
flow regulator if gas is to be supplied by a pres-
surized cylinder.
Temperature Adjustment
1. Turn the power switch on, to supply power to
the oven.
2. Turn the Temperature Control knob fully clock-
wise. The " eating" indicator will glow when the
unit is heating. When the temperature reaches
the desired operating level (as indicated on the
thermometer) turn the Temperature Control knob
counterclockwise until the " eating" indicator
turns off. Allow the temperature to cycle on and
off several times (3 to 4 hours) to make sure the
oven has stabilized. Adjust the Temp. Control
knob up or down as necessary.
3. When temperature is at the desired setting pro-
ceed to operate in any one of the following vac-
uum environments.
7
Operation
Note
Recommended vacuum tubing and
vacuum pumps are listed under the
Accessory Items section of this man-
ual.
Note
When the oven is new and is first
heated, the insulation will become
scorched and some smoke and
burning odor will occur. It is normal
for this condition to last 2 to 3 hours
at high heat.

Operation in a Static
Environment
Static environment refers to operation at atmospheric pres-
sure and with air as it is present. In this case the operator
would simply place the sample in the oven chamber and set
the desired temperature.
Operation in a Controlled
Environment
Controlled environment refers to operation with the samples
in an inert gas. To accomplish this, perform the following:
1. Place samples in the oven chamber then close the
oven door.
2. Close the purge control valve.
3. Open the vacuum control valve then turn on the
vacuum pumping system to remove any air
remaining in the oven.
4. Close the vacuum control valve and open the
purge control valve to bleed in an inert gas.
5. Close the purge control valve.
Operation in a Vacuum
Environment
To operate in a vacuum environment, perform the following:
1. Place samples in the oven then close the oven
door.
2. Close both the purge control and vacuum control
valves
3. Turn on the vacuum pumping system then open
the vacuum control valve (fully counterclockwise.)
4. The vacuum, in inches of mercury, can be
obtained from the vacuum gauge on the top of the
oven.
8
OPERATION

Vacuum Sealing Agents
• igh temperature vacuum grease is often nec-
essary to provide a proper seal at tubing con-
nections, valve connections, door seals, etc.
This is especially important at high vacuums.
Using silicone vacuum grease will damage the
door seal and has restrictions for some types of
materials placed in the oven..
Out Gassing
• The operation of the oven at high temperature
while evacuating the chamber will help drive off
absorbed gasses on the walls and three sur-
faces and facilitate attainment of high vacuums.
Precautions
• Do not operate oven at temperatures above
200°C.
• Do not permit materials of any kind to rest on
top of unit when operating at elevated tempera-
tures.
• Do not touch the oven door particularly the glass
portion, with unprotected hands when operating
at elevated temperatures.
• To prevent overheating unit is equipped with a
safety thermostat that will open at approximately
230°C.
9
OPERATION

• The oven is equipped with silicone door gas-
kets. Do not use silicone door gaskets or vacu-
um grease when evaporating solvents in the
oven or when using high aniline point oils.
BUNA-N gaskets should be used in applications
when evaporating solvents or when using high
aniline point oils. The interior finish or silicone
gaskets may be damaged by the following:
*BUNA-N gaskets sh uld n t be used ab ve 125°C
Diesel oil JP-4 oil
MIL-0-5606 ydraulic Fluids
Butyl Acetate Carbon Tetrachloride
Ethylene Chloride Gasoline
Kerosene Zylene
Methyl Chloride Stoddard Solvent
Toluene Aromatic Chlorinated Solvent
10
OPERATION

Cleaning Suggestions
• Use the mildest cleaning procedure that will do
the job effectively.
• Rinse thoroughly with water after every cleaning
operation.
• Wipe dry to avoid water marks.
• A stainless steel wool pad, sponge or fibrous
brush is recommended. Avoid use of ordinary
steel wool or steel brushes for scouring stain-
less steel.
Periodic Maintenance
• Secured access panels, covers, etc., should
never be removed from this equipment by any-
one other then experienced service personnel.
• If the oven fails to maintain set temperature, it
may indicate a problem with the Temperature
Control, or possibly a heating element failure. If
this occurs contact your local Fisher Scientific
service representative at (1-800-395-5442).
• Gaskets should be checked periodically for
hardening, shrinking, deterioration or other signs
of wear. It is advisable to keep several gaskets
available for use as replacements.
Seal Replacement
To replace the oven seal, remove the old seal and
perform the following:
1. Clean edge of chamber with Xylene. (Cat. No.
LLX5-500).
2. Apply a thin bead of Dow Corning RTV-736 red
silicone rubber adhesive to edge of the cham-
ber. Place gasket on chamber and close the
door.
3. Keep door closed for a minimum of 16 hours
with 1 to 2 inches of vacuum before using.
11
Maintenance

Accessory Items
Detailed information on accessory items is located in the
Fisher Scientific catalog.
Item No. Description
01-257-4C Vacuum Pump
01-257-4A Vacuum Pump Oil
01-257-12 Clear Vacuum Tubing
14-635-5D Vacuum Grease
Replacement Parts
Part No. Description
SPN83373 Power Switch
SPN102219 Temp. Control (Thermostat)
SPN20845 Temp. Control Knob
SPN102222 Thermal Cut-Out
SPN98991 Pilot Light
SPN102256 Thermometer
SPN38821 Rubber Feet
SPN102161 Control Valve
SPN102220 Vacuum Gauge
SPN50098 eating Element
SPN70435 Door Gasket - Silicone
SPN70435B Door Gasket - BUNA-N
SPN70435V Door Gasket - Viton
SPN102284 Window
SPN102282 andle Latch
SPN102524 Pawl
SPN102239 Strike Plate
When ordering replacement parts, please specify the
model number and serial number of your unit, and date
the unit was purchased. The model and serial numbers
can be found on the nameplate which is located near the
service cord.
12
Accessories and Replacement Parts

13
120V Schematic
Schematics
240V Schematic

14

15

Laboratory instruments and equipment manufactured by Fisher Scientific Company L.L.C. – Laboratory
Equipment Division (hereinafter called “the Company”) are warranted only as stated below.
Subject to the exceptions and upon the conditions specified below, the Company agrees, at its election, to
correct by repair, by replacement, or by credit to the purchaser, any defect of materials or workmanship which
develops within one year (13 months for refrigerator and freezer products) from the date of purchase by the
original purchaser by the Company or by an authorized dealer of the Company provided that investigation or
factory inspection by the Company discloses that such defect developed under normal and proper use
The exceptions an con itions mentione above are the following:
a. The Company makes no warranty concerning components or accessories not manufactured by it,
such as tubes, batteries, etc. owever, in the event of the failure of any component or accessory not
manufactured by the Company, the Company will give reasonable assistance to the purchaser in
obtaining from the respective manufacturer whatever adjustment is reasonable in the light of the
manufacturer’s own warranty.
b. The Company shall be released from all obligations under its warranty in the event repairs or
modifications are made by persons other than its own service personnel or authorized dealer
personnel unless such repairs by others are made with the written consent of the Company.
c. THE COMPANY MAKES NO WARRANTY OF MERCHANTABILITY, FITNESS FOR ANY
PARTICULAR PURPOSE, OR ANY OTHER WARRANTY, EXPRESS OR IMPLIED, EITHER IN
FACT OF BY OPERATION OF LAW,…STATUTORY OR OTHERWISE.
. The above warranty and the above obligations to repair, replace, or credit are complete and
exclusive and the Company expressly disclaims liability for lost profits or for special, indirect,
incidental, consequential, or exemplary damages of any nature whether attributable to contract,
warranty, negligence, strict liability, or otherwise even if the Company has been advised of the
possibility of such damages.
e. Representations and warranties made by any person, including dealers and representatives of the
Company, which are inconsistent or in conflict with the foregoing warranty shall not be binding upon
the Company unless reduced to writing and signed by an officer of the Company.
Warranty