Thermo Scientific 3625A User manual

Thermo Scientific Hi-Temp
Programmable Vacuum Oven
Operating Manual 107567 Rev. 0
_________________________________________________________________________________
Part of Thermo Fisher Scientific

Thermo Scientific
MANUAL NUMBER 107567 (7006250)
0 -- 3/31/10 Transfer to Marietta (was 107567 2/6/09) ccs
REV ECR/ECN DATE DESCRIPTION By
Preface
Programmable Vacuum Oven i
Models covered in this manual
Catalog numbers Model numbers Voltage
3625A 6250 120V
3625A-1 6251 240V

Thermo Scientificii Programmable Vacuum Oven
Preface
Important Read this instruction manual. Failure to read, understand and follow the instructions in this manual
may result in damage to the unit, injury to operating personnel, and poor equipment performance. s
Caution All internal adjustments and maintenance must be performed by qualified service personnel. s
Material in this manual is for information purposes only. The contents and the product it describes are subject to
change without notice. Thermo Scientific makes no representations or warranties with respect to this manual. In
no event shall Thermo be held liable for any damages, direct or incidental, arising out of or related to the use of
this manual.
©2010 Thermo Fisher Scientific. All rights reserved.

Thermo Scientific Programmable Vacuum Oven iii
Preface
Important operating and/or maintenance instructions. Read the accompanying text carefully.
Potential electrical hazards. Only qualified persons should perform procedures associated with this
symbol.
Equipment being maintained or serviced must be turned off and locked off to prevent possible injury.
Hot surface(s) present which may cause burns to unprotected skin, or to materials which may be
damaged by elevated temperatures.
Marking of electrical and electronic equipment, which applies to electrical and electronic equipment
falling under the Directive 2002/96/EC (WEEE) and the equipment that has been put on the market
after 13 August 2005.
This product is required to comply with the European Union’s Waste Electrical & Electronic
Equipment (WEEE) Directive 2002/96/EC. It is marked with the WEEE symbol. Thermo Scientific
has contracted with one or more recycling/disposal companies in each EU Member State European
Country, and this product should be disposed of or recycled through them. Further information on
Thermo’s compliance with this directive, the recyclers in your country and information on Thermo
products will be available at www.thermofisher.com.
4Always use the proper protective equipment (clothing, gloves, goggles, etc.)
4Always dissipate extreme cold or heat and wear protective clothing.
4Always follow good hygiene practices.
4Each individual is responsible for his or her own safety.

Thermo Scientificiv Programmable Vacuum Oven
Preface
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Programmable Vacuum Oven vThermo Scientific
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Accelerated Heatup Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
In a Purged Atmosphere . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
In a Vacuum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
In a Static Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Temp Controller and Heating Element Replacement . . . . . . . . . . . . .5-1
Seal Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Replacement Parts/ Accessory Items . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Electrical Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
Section 1
Section 2
Section 3
Section 4
Section 5
Section 6
Section 7

Programmable Vacuum Oven 1-1Thermo Scientific
Section 1 Introduction
The Hi-Temp Programmable Vacuum Oven is a multi-purpose unit that
operates under reduced pressures and/or inert atmospheres. Intended for
both low and high temperature applications, it features a 304 stainless-steel
work chamber, which resists contamination and corrosion from chemically
active vapors, and a dual-electronic control system, the Safety Sentinel,
which automatically protects samples from overheating.
To achieve temperature uniformity, sheath heaters completely cover the
top, bottom and sides of the oven chamber. Moreover, four-inch-thick
fiberglass insulation surrounds the chamber and heater assemblies.
For operational convenience, all controls and indicators are located on the
front panel. In addition to a power switch and three indicators, one to
show power, one to indicate when the heaters are energized and one to
indicate when the primary temperature control has failed - these include
purge gas and vacuum control valves, a 0-to-30-inch vacuum gauge and a
temperature control. The door is equipped with a full-length, low
temperature handle and a large observation window to assure safe sample
loading and viewing, even at high temperatures. There is also a positive-
action cam-type lock that holds the door tightly against the oven seal. The
rear panel contains gas and vacuum system connectors, and the chamber
contains a thermometer and two removable shelves.
The Vacuum Oven can fulfill practically every need associated with general
drying, conditioning, curing, desiccating, and annealing – as well as
moisture tests. When compared with conventional ovens, samples dry
faster at lower temperatures, and heat-sensitive materials dry safely without
degradation problems.

Programmable Vacuum Oven 2-1Thermo Scientific
Section 2 General Specifications
Performance Characteristics
Power Requirements:
Cat. No. 3625A . . . . . . . .120V, 50/60 Hz, 8.5A
Cat. No. 3625A-1 . . . . . .240V, 50/60 Hz, 4.2A
Power Input: . . . . . . . . . . . . . . . . . . .1000W max.
Temperature Range: . . . . . . . . .Ambient to 280°C
Control Sensitivity: . . . . . . . . . . . . . . . . . . .±1.0°C
Constancy: . . . . . . . .±1.0°C (at ultimate vacuum)
Safety Differential: . . . . . . . . . . . . . . . . . . .~5.0°C
Vacuum Range: . . . . . . . . .Atmosphere to 30” Hg
Pump-Down Time: . . . . . . . . . . . . . . . . . .6 Min*
Vacuum Leak Rate: . . . . . .<0.5” Hg per 24 hours
Physical Data
Overall Dimensions: . . . . .22¾H x 17¾D x 18W
Chamber Dimensions: . . .9¾H x 11½ D x 9¾W
Chamber Capacity: . . . . . . . . . . . . .0.65 cubic feet
Shelf and Floor Area: . . . . . . . . .313 square inches
Shipping Weight: . . . . . . . . . . . . . . . . . . . .~90 lbs.
*Using a single-stage mechanical vacuum pump with a free air capacity of 35
liters per 1 minute.
Approximate Dial Settings in Static Air
Dial Setting Temperature
2 25°C
4 55°C
6 85°C
8 115°C
10 145°C
12 180°C
14 210°C
16 240°C
18 275°C

2-2 Programmable Vacuum Oven Thermo Scientific
Section 2
General Specifications
Approximate Heat Up Times to Various Temperatures
T. Initial T. Final Standard Accelerated
25°C 100°C 75 min. 35 min.
25°C 200°C 95 min. 75 min.
25°C 275°C 120 min. ----------

Programmable Vacuum Oven 3-1Thermo Scientific
Section 3 Unpacking
The Vacuum Oven is shipped in a single carton. After unpacking, check
each “loose” item against the packing list below. If a shortage exists, notify
Technical Services. Where damage occurred during transit, keep everything
intact, including the carton and packing material, and immediately file a
claim with the final carrier. Usually the firm will send a representative to
ascertain liability.
Part numbers are listed in the Replacement Parts and Accessory Items
section located at the end of this manual.
To prepare the Vacuum Oven for operation:
1. Remove all holding tape from surface of cabinet and work chamber, as
well as the shelves.
2. Place shelves in work chamber.
3. Check that the dial thermometer is inserted through the metal support
located at the top center of oven chamber, adjust if necessary to
reading position and then finger-tighten holding screw.
4. Remove and discard plastic sealing caps from both connector openings
on rear panel, and attach the supplied serrated hose connectors. To
assure an airtight connection, use thread sealing compound or Teflon
sealing tape.
Caution Never operate unit with caps in openings. Under certain
circumstances, they could clog vacuum and purge lines. s
Quantity Item
1 Vacuum Oven
2 Serrated Hose Connector
2 Shelf
1 Warranty Card
1 Instruction Manual
1 Vacuum Grease
Assembly

3-2 Programmable Vacuum Oven Thermo Scientific
Section 3
Unpacking
Assembly (continued) 5. Place unit on a suitable table or bench where it is to be used.
6. Close PURGE and VACUUM VALVE controls on control panel by
turning each clockwise as far as possible.
7. Turn TEMPERATURE control to low position on dial, and place
POWER switch in OFF position.
8. Connect a vacuum pumping system with suitable trap to serrated
outlet fitting marked VACUUM. Use heavy-walled vacuum tubing and
secure connection with a hose clamp.
9. If desired, connect a purge gas supply to serrated inlet fitting marked
PURGE. Use a two-stage gas-flow regulator if gas is to be supplied by a
pressurized cylinder.
10. Check data plate and plug line cord into a suitable power receptacle.
11. Spread a light coating of high temperature vacuum grease on the
surface of door seal.
Caution Do not use silicone vacuum grease. It will damage the door seal
and has restrictions for some types of materials placed in the oven. s
Note Vacuum operation to 30” Hg can be obtained easily using a single-
stage mechanical pump with a free air capacity of 35 liters per minute. s

Programmable Vacuum Oven 4-1Thermo Scientific
Section 4 Operation
The Vacuum Oven is equipped with a 0 to 300°C dial thermometer,
graduated in 5° increments and mounted internally at the top of the oven
chamber. Easily read through the observation window, the thermometer is
used in conjunction with the TEMPERATURE control dial - arbitrarily
numbered from low to 20 - to obtain the specified temperature for a given
application. If desired, the same temperature can be obtained again simply
by reproducing the control setting.
Along with the other controls and indicators, the front panel contains a
power switch and three indicators. During operation, the red HEAT lamp
section will illuminate to show that the heaters are energized. The yellow
SAFETY lamp section will illuminate to show that the primary thermostat
is malfunctioning and that the SAFETY is controlling temperature at
approximately 5° above set point.
Note After controlling at a specified temperature, if the Set Temperature
Dial is rotated counterclockwise, the Safety Sentinel indicator will come
on. This is a normal condition and not a malfunction. s
1. Place POWER switch to ON position.
2. Slowly rotate TEMPERATURE control dial clockwise until heat
indicator comes on.
3. Observe the chart of approximate temperature settings. Set the dial to
the number indicated for the desired temperature. Allow sufficient
time for the oven to stabilize.
4. Due to the high mass of vacuum ovens, the heat up time is relatively
slow. Observe the chart of approximate heat up times. The oven can be
heated at a faster rate by setting the dial, 2 settings above the desired
temperature. Observe the thermometer. When the temperature reaches
20°C below the desired temperature, set the dial 2 settings lower. The
oven will come into the final temperature quicker using this method.
T. Initial T. Final Standard Accelerated
25°C 100°C 75 min. 35 min.
25°C 200°C 95 min. 75 min.
25°C 275°C 120 min. ----------
Approximated Heatup Times to
Various Temperatures
Setup

4-2 Programmable Vacuum Oven Thermo Scientific
Section 4
Operation
Setup (continued) 5. Readjust the temperature control dial for the exact temperature. A
record of temperature control settings versus thermometer readings
should be constructed for future reference. The data will serve as an
effective means of reproducing given temperatures and establishing
intermediate heat levels.
6. After desired temperature is obtained, place material to be processed in
work chamber, and operate unit per one of the following methods.
The unit can be operated at atmospheric pressure with ambient air or with
a controlled atmosphere. If the latter is desired, turn on the vacuum
pumping system, and open the VACUUM VALVE control by turning
knob counterclockwise as far as possible. After the chamber is pumped
down, close the VACUUM VALVE control and turn off the vacuum
pumping system. Next, bleed in an inert gas by opening and then closing
PURGE VALVE control.
To operate the unit at reduced pressure, first apply a light film of high
temperature vacuum grease around the oven seal, then close and lock the
door in position. Next, turn on the vacuum pumping system and open the
VACUUM VALVE control.
Operate unit with a purged atmosphere by pulling gas through chamber.
To do this, turn on vacuum pumping system, and open VACUUM
VALVE control. Next, open the PURGE VALVE control to bleed in gas.
1. Set temperature dial 2 divisions higher than the final desired
temperature.
2. When actual temperature is 20°C below desired temperature, set the
dial 2 divisions lower to the number that coincides with your set
3. Example: 100°C setting is approximately position #7. Set dial to
position #9 until actual temperature on the thermometer is 80°C. Set
the dial to position #7. The oven will stabilize in about half the time
compared to a standard run.
In a Static Environment
In a Vacuum
In a Purged Atmosphere
Accelerated Heatup
Method

Programmable Vacuum Oven 4-3Thermo Scientific
Section 4
Operation
When using the Vacuum Oven, the following precautions must be
observed at all times:
• Do not operate the unit at temperatures above 280°C.
• Do not permit materials of any kind to rest on top of the unit when
operating at elevated temperatures.
• Do not touch the door, particularly the glass portion, with unprotected
hands when operating at elevated temperatures.
Before operation, always observe the following Safety Precautions. 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 pH at
all times.
Precautions
Safety Precautions

Programmable Vacuum Oven 5-1Thermo Scientific
Section 5 Maintenance
Maintenance procedures follow.
To replace the oven seal, remove the old seal and perform the following:
1. Clean the edge of the chamber with Xylene or similar.
2. Apply a thin bead of Dow Corning RTV-736 red silicone rubber
adhesive to the edge of the chamber.
3. Install gasket and close door.
4. Keep door closed for a minimum of 16 hours with 1-2 inches of
vacuum before using.
Replacing the temperature controller or the heating elements requires
complete disassembly of the cabinet panels and insulation, and should be
done only by qualified personnel. If it should become necessary to replace
any of these components, contact Technical Services.
Seal Replacement
Temp Controller and
Heating Element Repl.

Section 6 Replacement Parts/
Accessory Items
Programmable Vacuum Oven 6-1Thermo Scientific
Item Number
Vacuum Gauge LL02330
Vacuum or Purge Valve with Knob LL44342
Heater Element (HTR1, 2) LL30790
Temperature Controller (120V) LL83372
Temperature Controller (240V) LL88196
Knob, Temp. Controller (PC26B 1) LL32615
Power Switch (S1) LL102627
Door Seal Replacement Kit LL50430
Shelf LL02340
Hose Connector (1/4”) LL98573
Vacuum Grease LL16023
Thermocouple LL102716