BARNSTEAD|THERMOLYNE CORPORATION MIRAK™ Hot Plates, Stirrers and Stirring Hot Plates OPERATION MANUAL AND PARTS LIST SERIES 725, 726, 727, 728, 729, 730 Model # HP72620 HP72620-26 HP72624 HP72625 S72520 S72520-26 S72524 S72525 SP72720 SP72720-26 SP72724 SP72725 HP72930 HP72930-26 HP72934 HP72935 HP72935-60 HP72938 S72830 S72830-26 S72834 S72835 SP73030 SP73030-26 SP73034 SP73035 SP73035-60 SP73038 LT727X7 • 9/9/99 Voltage 240 220-240 100 120 240 220-240 100 120 240 220-240 100 120 240 220-240 100 120 120
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. Table of Contents Safety Information.........................................................................................................................3 Alert Boxes ..................................................................................................................................3 Warnings.....
Safety Information Your Thermolyne MIRAK™ stirrer, hot plate, or stirring hot plate has been designed with function, reliability, and safety in mind. It is your responsibility to install it in conformance with local electrical codes. Alert Signals 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. Warnings WARNING To avoid electrical shock, always: 1.
Please note the following WARNINGS: WARNING This warning is presented for compliance with California Proposition 65 and other regulatory agencies and only applies to the insulation in this product. This product contains refractory ceramic, refractory ceramic fiber or fiberglass insulation, which can produce respirable dust or fibers during disassembly. Dust or fibers can cause irritation and can aggravate pre-existing respiratory diseases.
Introduction Please read all the information in this manual before operating the unit. Your Thermolyne MIRAK™ hot plate, stirrer or stirring hot plate is a general purpose heating and/or stirring plate designed for laboratory procedures requiring precise control of temperature and/or stirring speed.
Installation WARNING Use a properly grounded electrical outlet of correct voltage and current handling capacity. Do not remove or modify grounded power plug. Use only properly grounded outlets to avoid shock hazard. Not rated for use in hazardous atmospheres. 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.
Operation WARNING Use caution when heating volatile materials; top surface and element can reach the “Flash Point Temperature” of many chemicals. These hot plates and stirring hot plates are not explosion proof. Fire or explosion may result. Unit contains components which may ignite such materials. Use appropriate hand and eye protection when handling hazardous chemicals. "Caution: Hot Surface. Avoid Contact.
If you want to ensure that the unit will not start to stir if the knob is inadvertently pressed, turn the speed control knob until the display indicates the word OFF.
Controlling Top Plate Temperature Your MIRAK hot plate or stirring hot plate will control the top plate, and the display will indicate top plate temperature WHENEVER THE PROBE IS NOT PLUGGED IN. When the unit is displaying the top plate temperature the word TOP on the front panel will be illuminated.
Calibrating the Probe Temperature Input NOTE The following procedure can be performed only on units with serial numbers greater than the following: 7" Hot Plates .... 726931000000 7" Stirring Hot Plates ... 727931000000 12" Hot Plates ...729931000000 12" Stirring Hot Plates ... 730931000000 To verify the temperature reading of the probe, insert a calibrated thermometer into a solution you are heating on the stirring hot plate.
To Achieve Fast Heat-up of Large Volumes With a Probe When heating large volumes of solution preheat the top plate at maximum temperature to allow the plate to heat the solution quickly before plugging your probe in to the probe receptacle in the back of the unit. As the top plate heats, monitor your solution temperature with a standard laboratory thermometer until your solution is approximately 15 degrees below your desired setpoint.
12" x 12" 240 volt MIRAK 12" x 12" 240 volt MIRAK 12" x 12" 240 volt MIRAK 540°C 540°C 540°C 1 liter 2 liter 4 liter 1000 ml (water) 1800 ml (water) 4000 ml (water) 17 min. 21 min. 25 min. Variability in heat-up times will be observed with different types of containers due to container shape and the thickness of the container wall. For temperature accuracy and stability information please refer to the Operating Specifications on page 13.
Operating Specifications Top Plate Surface............................................................................................Solid Ceramic Heating Specifications Temperature range All 7" x 7" models and the 208 and 240 volt models of the 12" x 12" models. 100 and 120 volt 12" x 12" models. 40°C to 540°C 40°C to 370°C Heat-up time to maximum temperature (unloaded top plate). 8 minutes Temperature stability at the center of the top plate surface (@ 70°C). ± 2.
General Operating Specifications Dimensions- 7" x 7" Models Model Numbers Overall Width Overall Height Overall Depth Top Plate Width Top Plate Height Top Plate Depth Weight lbs. (kg) HP72620 HP72620-26 HP72624 HP72625 8.250 (20.96) 5.750 (14.61) 12.250 (31.12) 7.375 (18.73) — 7.375 (18.73) 8.44 (3.81) SP72720 SP72720-26 SP72724 SP72725 8.250 (20.96) 5.750 (14.61) 12.250 (31.12) 7.375 (18.73) — 7.375 (18.73) 10.33 (4.67) S72520 S72520-26 S72524 S72525 8.250 (20.96) 5.50 (13.97) 12.250 (31.12) 7.375 (18.
Electrical Ratings- 12" x 12" Models Model No. HP72930 HP72930-26 HP72934 HP72935 HP72935-60 HP72938 Volts 220-240 220-240 100 120 120 208 Amps 12 12 16.5 13.5 13.5 13.9 Watts 3100 3100 1650 1620 1620 2900 Freq. 50/60 50/60 50/60 50/60 50/60 50/60 Phase 1 1 1 1 1 1 S72830 S72830-26 S72834 S72835 220-240 220-240 100 120 0.22 0.22 0.32 0.33 30 30 21 22 50/60 50/60 50/60 50/60 1 1 1 1 SP73030 SP73030-26 SP73034 SP73035 SP73035-60 SP73038 220-240 220-240 100 120 120 208 12 12 16.8 13.8 13.8 14.
Maintenance and Servicing WARNING Disconnect from power supply before servicing. Keep top surface clean. Use a non-abrasive cleaner. Alkali spills, hydrofluoric acid spills or phosphoric acid spills may damage top and lead to thermal failure. Unplug unit and remove spills promptly. Do not immerse unit for cleaning. Replace the top immediately if damaged by etching, scratching or chipping. A damaged top can break in use. Refer servicing to qualified personnel. Replacing the Power Board 1. 2. 3. 4. 5. 6.
Power board for stirrer detailing correct placement of wires and cables. Replacing the Logic Board 1. 2. 3. 4. 5. 6. 7. Unplug unit, turn unit upside down and remove screws from bottom. Open unit. Locate logic board in the center of the unit. Note the position and color of wires and cables connected to the board. Remove the wires, cables and the 2 nuts on the mounting bracket.
7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. Remove the screws holding the top plate onto the case. (4 screws on 7" x 7" models, 6 screws on 12" x 12" models.) Remove the clamp holding the element lead down. Flip top plate over. Note the distance of the magnet assembly from the baffle plate. Remove the magnet assembly. Remove the two screws holding the motor and replace the motor. Replace the magnet assembly. Flip plate over, making sure thermocouple wire comes through the plate.
Logic Printed Circuit Board Set-up Procedure 1. 2. 3. 4. 5. 6. 7. Place a 500 ml flask with 300 ml of water on the top plate. Place a standard laboratory thermometer (do not use the probe for this procedure) 1/2" above the bottom of the flask. Turn the unit on and set the temperature at 70°C. Allow the unit to operate at this temperature for five hours. At the end of five hours, note the temperature measurement on the thermometer. (Ideally, the thermometer should read between 41°C and 47°C.
9. 10. 11. 12. 13. Refer to the difference that you recorded in step #3. If that difference was greater than +3, turn the knob CLOCKWISE, counting each click of the knob until you have advanced the knob the same number of positions as the difference you calculated in step #3, then turn the knob one additional click. (The knob is detented so you can feel a click at each one degree position on the knob. Do not turn the knob a full rotation).
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Exploded View: Stir Plates 23 Barnstead |Thermolyne • 800-553-0039
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Replacement Parts List To insure your safety and for proper operation, the ceramic top plates for hot plates and stir plates are only sold as complete assemblies. This assembly includes the ceramic top, element, thermocouple, insulation, baffle plate, and 2 ceramic top holders.
7 Power Supply Printed Circuit Boards: (Back of Unit) PC725X1A PC725X2A PC725X3A PC726X2A PC726X3A PC726X4A PC727X1A PC727X4A PC727X5A PC730X3A Not listed on exploded view 7" & 7" & 7" & 7" & 7" & 7" & 7" & 7" & 7" & 12" 12" 12" 12" 12" 12" 12" 12" 12" 12" 120V 220-240V 100V 220-240V 100V 120V 120V 100V 220-240V 208V Stirrers Stirrers Stirrers Hot Plates Hot Plates Hot Plates Stir Plates Stir Plates Stir Plates Stir Plates & Hot Plates Additional Replacement Parts Part Number SWX140 SWX104 SWX141 Un
Barnstead|Thermolyne One Year Limited Warranty 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, Barnstead|Thermolyne 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.
