Table of Contents
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MIRAK™ Hot Plates,
Stirring Hot Plates
SERIES 725, 726, 727, 728, 729, 730
LT727X7 • 9/9/99
BARNSTEAD|THERMOLYNE CORPORATION
Stirrers and
OPERATION MANUAL
AND PARTS LIST
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
Serial Number: _______________________________
Voltage
Description
240
220-240
100
120
240
220-240
100
120
240
220-240
100
120
240
12x12
220-240
12x12
100
12x12
120
12x12
120
12x12
208
12x12
240
12x12
220-240
12x12
100
12x12
120
12x12
240
12x12
220-240
12x12
100
12x12
120
12x12
120
12x12
208
12x12
7x7
7x7
7x7
7x7
7x7
7x7
7x7
7x7
7x7
7x7
7x7
7x7
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Table of Contents
Summary of Contents for MIRAK 725 series
- Page 1 BARNSTEAD|THERMOLYNE CORPORATION MIRAK™ Hot Plates, Stirrers and Stirring Hot Plates OPERATION MANUAL AND PARTS LIST SERIES 725, 726, 727, 728, 729, 730 Model # Voltage Description HP72620 HP72620-26 220-240 HP72624 HP72625 S72520 S72520-26 220-240 S72524 S72525 SP72720 SP72720-26 220-240 SP72724...
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Page 2: Table Of Contents
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............................3 Introduction..........................5 Unpacking............................5 Installation............................7 Principles of Operation........................7... -
Page 3: Safety Information
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. - Page 4 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.
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Page 5: Introduction
Unpacking Remove your MIRAK hot plate, stirrer or stirring hot plate from the carton. Inspect to ensure that the unit has not been damaged during shipment. If the unit appears to have sustained shipping damage contact the distributor from whom you purchased this product or Barnstead/Thermolyne Customer Service at 800- 553-0039. -
Page 7: Installation
The electronic stirring speed control will maintain the speed setpoint when the unit is loaded at 2 RPM as displayed by the LED display on the unit. The motor in the MIRAK stirrers and stirring hot plates produces maximum stirring torque under normal laboratory load conditions, and is combined with a powerful magnet to provide exceptional magnetic coupling with a stirbar. -
Page 8: Operation
The Power Switch Your MIRAK unit has a separate ON/OFF power switch which is a black rocker switch located on the lower front corner of the right side as you're facing the unit. This separate power switch allows you to turn your MIRAK hot plate, stirrer or stirring hot plate on or off without disturbing your temperature and/or speed setting. -
Page 9: Stirring Speed Guide
Your MIRAK hot plate or stirring hot plate will display the temperature in C. The display will always indicate 'OFF' or your last setpoint, and the 'SET' light will be illuminated until you press the heat control knob to initiate operation. -
Page 10: Controlling Top Plate Temperature
When using a probe with your MIRAK hot plate or stirring hot plate it is recommended that you use a clamp on a support rod to hold the probe in your solution. -
Page 11: Calibrating The Probe Temperature Input
To verify the temperature reading of the probe, insert a calibrated thermometer into a solution you are heating on the stirring hot plate. When the thermometer reading has stabilized, record the temperature readings given by both the thermometer and by the probe as indicated on the MIRAK display. To calibrate the probe: Unplug unit, turn unit upside down and remove screws from bottom. -
Page 12: To Achieve Fast Heat-Up Of Large Volumes
Because the advanced electronic control in the MIRAK is capable of precisely regulating the top plate temperature, metal vessels and sand baths may be heated safely without the danger of the ceramic top breaking. - Page 13 12" x 12" 240 volt MIRAK 540 C 1 liter 1000 ml (water) 17 min. 12" x 12" 240 volt MIRAK 540 C 2 liter 1800 ml (water) 21 min. 12" x 12" 240 volt MIRAK 540 C 4 liter 4000 ml (water) 25 min.
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Page 14: Operating Specifications
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. 40 C to 540 C 100 and 120 volt 12" x 12" models. 40 C to 370 C Heat-up time to maximum temperature (unloaded top plate). -
Page 15: General Operating Specifications
General Operating Specifications Dimensions- 7" x 7" Models Model Numbers HP72620 SP72720 S72520 HP72620-26 SP72720-26 S72520-26 HP72624 SP72724 S72524 HP72625 SP72725 S72525 Overall Width 8.250 (20.96) 8.250 (20.96) 8.250 (20.96) Overall Height 5.750 (14.61) 5.750 (14.61) 5.50 (13.97) Overall Depth 12.250 (31.12) 12.250 (31.12) 12.250 (31.12) -
Page 16: Temperature Range For Hot Plates And Stirring Hot Plates
Electrical Ratings- 12" x 12" Models Model No. Volts Amps Watts Freq. Phase HP72930 220-240 3100 50/60 HP72930-26 220-240 3100 50/60 HP72934 16.5 1650 50/60 HP72935 13.5 1620 50/60 HP72935-60 13.5 1620 50/60 HP72938 13.9 2900 50/60 S72830 220-240 0.22 50/60 S72830-26 220-240... -
Page 17: Maintenance And Servicing
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. -
Page 18: Replacing The Logic Board
Power board for stirrer detailing correct placement of wires and cables. Replacing the Logic Board 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. -
Page 19: Replacing The Top Plate Assembly
The set-up procedure should be followed whenever the top plate assembly or the logic board is replaced in your MIRAK hot plate or stirring hot plate. The set-up procedure is not necessary when replacing the top plate or the logic board in the stirrers. -
Page 20: Set-Up Procedure
Logic Printed Circuit Board Set-up Procedure 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. -
Page 21: Troubleshooting Guide
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 . - Page 22 Exploded View: Stirrers...
- Page 23 Exploded View: Stir Plates Barnstead |Thermolyne • 800-553-0039...
- Page 24 Exploded View: Hot Plates...
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Page 25: Replacement Parts List
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. Key Number Part Number Unit Size Unit Voltage... -
Page 26: Ordering Procedures
Power Supply Printed Circuit Boards: (Back of Unit) PC725X1A 7" & 12" 120V Stirrers PC725X2A 7" & 12" 220-240V Stirrers PC725X3A 7" & 12" 100V Stirrers PC726X2A 7" & 12" 220-240V Hot Plates PC726X3A 7" & 12" 100V Hot Plates PC726X4A 7"... -
Page 27: Warranty
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.
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