THERMOLYNE 78 Series User manual

Type 7800
Magnetic Stirrer
OPERATION MANUAL
AND PARTS LIST
Series 78
Model No. Voltage Hz.
S7805 120V 50/60
1
BARNSTEAD|THERMOLYNE
LT78X2 • 1/4/00

IMPORTANT INFORMATION
This manual contains important operating and safety information. The user must carefully
read and understand the contents of this manual prior to the use of this equipment.
Safety Information ..............................................................................................................................................3
Alert Signals..................................................................................................................................................3
Warnings ......................................................................................................................................................3
Introduction..........................................................................................................................................................4
Electrical Ratings..........................................................................................................................................4
Operation ............................................................................................................................................................5
Maintenance and Servicing ................................................................................................................................6
To Replace Drive Motor (Part No. MTX4) ....................................................................................................6
To Replace Speed Control Rheostat (Part No. RS174X1A) ........................................................................6
Exploded View ....................................................................................................................................................8
Replacement Parts..............................................................................................................................................9
Ordering Procedures ........................................................................................................................................10
One Year Limited Warranty ..............................................................................................................................11
2
Table of Contents

Your Thermolyne Type 7800 Magnetic Stirrer has been
designed with function, reliability, and safety in mind. It is
the user’s responsibility to install it in conformance with
local electrical codes. For safe operation, please pay
attention to the alert boxes throughout the manual.
Warnings
To avoid electrical shock, always:
1. Use a properly grounded electrical outlet of cor-
rect voltage and current handling capacity.
2. Disconnect from the power supply prior to main-
tenance and servicing.
To avoid personal injury:
1. Do not use in the presence of flammable or
combustible materials; fire or explosion may
result. This device contains components which
may ignite such materials.
2. Refer servicing to qualified personnel.
3. “Caution: Hot Surface. Avoid Contact.”
3
Safety Information
Warning
Warnings alert you to a
possibility of personal injury.
Caution
Cautions alert you to a
possibility of damage to the equipment.
Note
Notes alert you to pertinent facts and
conditions.
Hot Surface
Hot 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

The Model S7805 Thermolyne Magnetic Stirrer is fur-
nished complete with three wire cord and plug ready to
plug into any standard grounded 120 volt outlet. The unit
provides stirring capability from 60 to 1200 rpm. Good
speed control is achieved by a unique system of eddy
current breaking and a closely matched motor/rheostat
combination. A 1” by 5/16” diameter Teflon®coated stir
bar is also included.
Electrical Ratings
Model Volts Amps Watts Hz
S7805 120 0.15 18 50/60
4
Introduction
Warning
Use a properly grounded electrical out-
let of correct voltage and current han-
dling capacity.
® Registered trademark of DuPont.

The “speed” control rheostat is a combination “ON-OFF”
switch and setting selector. The fully counterclockwise
position is “OFF,” fully clockwise is maximum speed. To
select a speed, turn the “speed” control knob clockwise
until the desired mixing action is achieved. An additional
“ON-OFF” switch is provided to allow an operator to pre-
set a given speed on the rheostat. Once set, the stirrer
can be turned on and off without changing the desired
speed setting.
5
Operation
Warning
Do not use in the presence of flamma-
ble or combustible materials; fire or
explosion may result. This device con-
tains components which may ignite
such materials.
Hot Surface
“Caution: Hot Surface. Avoid Contact.”
Caution
Gross weight of items placed on top of
stirrers should not exceed 5 lbs.
Warning
Disconnect from the power supply
prior to maintenance and servicing.
Refer servicing to qualified personnel.

To Replace Drive Motor (Part
No. MTX4)
1. Disconnect the stirrer from the power source.
2. Place the unit on its top, remove the two screws
holding the bottom cover to the case, then
remove the bottom cover with the motor and
magnet attached.
3. Remove the two screws and nuts holding the
motor and magnet assembly to the bottom
cover.
4. Remove the magnet assembly from the motor
shaft by loosening the set screws on the magnet
assembly.
5. Remove the two wire terminals attaching the
motor leads to the power cord and rheostat.
6. Reverse the above steps to install the new
motor.
To Replace Speed Control
Rheostat (Part No. RS174X1A)
1. Disconnect the stirrer from the power source.
2. Place the unit on its top, remove the two screws
holding the bottom cover to case, and then
remove the bottom cover with the motor and
magnet attached.
3. Loosen the control knob set screw, remove the
control knob, then remove the rheostat from the
stirrer by removing the locking nut on the front
of the dial plate.
6
Maintenance and Servicing
Warning
Disconnect from the power supply
prior to maintenance and servicing.
Refer servicing to qualified personnel.

4. Remove the “ON-OFF” switch by removing the
locking nut.
5. Unsolder the switch lead from the rheostat.
6. Remove the wire terminal attaching the rheostat
to the motor lead.
7. Reverse the above steps to install the new rheo-
stat.
7
MAINTENANCE AND SERVICING

8
Exploded View

Model Number: S7805, Series Number: 78
Key Part
Number Number Description
1 PT174X1 Plate, Top
2 CU101X1A Coupling
3 MTX4 Motor
4 RS174X1A Rheostat
5 CRX8 Cord Set
6 CS78X1A Case
7 DL174X1 Dial Plate
8 KBX14 Knob
9 PT78X1 Plate, Bottom
*LT78X1 Wiring Diagram Instructions
*LT78X2 Parts List
*ZSX122A Spin Bar 1” X 5/16” Dia.
*These are not shown on the exploded view.
9
Replacement Parts

Please refer to the Specification Plate for the complete
model number, serial number, and series number when
requesting service, replacement parts or in any corre-
spondence concerning this unit.
All parts listed herein may be ordered from the
Barnstead|Thermolyne dealer from whom you purchased
this unit or can be obtained promptly from the factory.
When service or replacement parts are needed we ask
that you check first with your dealer. If the dealer cannot
handle your request, then contact our Customer Service
Department at 319-556-2241 or 800-553-0039.
Prior to returning any materials to Barnstead|Thermolyne
Corp., please contact our Customer Service Department
for a “Return Goods Authorization” number (RGA).
Material returned without a RGA number will be refused.
10
Ordering Procedures

Barnstead|Thermolyne Corporation warrants that if a product manufactured by
Barnstead|Thermolyne and sold by it within the continental United States or Canada
proves to be defective in material or construction, it will provide you, without charge, for a
period of ninety (90) days, the labor, and a period of one (1) year, the parts, necessary to
remedy any such defect. Outside the continental United States and Canada, the warranty
provides, for one (1) year, the parts necessary to remedy any such defect. The warranty
period shall commence either six (6) months following the date the product is sold by
Barnstead|Thermolyne or on the date it is purchased by the original retail consumer,
whichever date occurs first.
All warranty inspections and repairs must be performed by and parts obtained from an
authorized Barnstead|Thermolyne dealer or Barnstead|Thermolyne (at its own discre-
tion). Heating elements, however, because of their susceptibility to overheating and con-
tamination, must be returned to our factory, and if, upon inspection, it is concluded that fail-
ure is not due to excessive high temperature or contamination, warranty replacement will
be provided by Barnstead|Thermolyne. The name of the authorized
Barnstead|Thermolyne dealer nearest you may be obtained by calling 1-800-446-6060
(319-556-2241) or writing to: Barnstead|Thermolyne
P.O. Box 797
2555 Kerper Boulevard
Dubuque, IA 52004-0797
USA
FAX: [phone]
E-MAIL ADDRESS: [email protected]
Barnstead|Thermolyne’s sole obligation with respect to its product shall be to repair or (at
its own discretion) replace the product. Under no circumstances shall it be liable for inci-
dental or consequential damage.
THE WARRANTY STATED HEREIN IS THE SOLE WARRANTY APPLICABLE TO
Barnstead|Thermolyne PRODUCTS. Barnstead|Thermolyne EXPRESSLY DISCLAIMS
ANY AND ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING WAR-
RANTIES OF MERCHANTABILITY OR FITNESS FOR USE.
11
One Year Limited Warranty

9001
ISO
REGISTERED
Barnstead|Thermolyne
2555 Kerper Blvd.
P.O. Box 797
Dubuque, IA 52004-2241
Phone: [phone]
Fax: [phone]
E-Mail Address: [e-mail]