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1 Electron Microscopy Sciences INSTRUCTIONAL MANUAL CAT Explosion Proof Hot Plate Stirrer Model SF87325 P.O. Box 550 s1560 Industry Road s Hatfield PA 19440
2 1 Safety Symbols Used in this Instruction Manual This manual contains important safety and operating information. Read carefully and understand the entire contents of this manual prior to the use of this equipment. Safety Symbols and their meanings: Note Notes alert you to pertinent facts and conditions. Caution Cautions alert you to a possibility of damage to the equipment. Warning Warnings alert you to various hazards such as explosion, risk of fire and/or the possibility of personal injury. Hot Surface Hot surfaces alert you to a possibility of personal injury if you come in con tact with a surface during use or for a period of time after use. Electrical Shock Hazard This alerts you to a possibility of electrical shock. Introduction The Explosion-Proof Stirring Hot Plate is UL listed and meets OSHA and other safety standards. It is used for applications requiring temperatures from 38 C (100 F) to 218 C (424 F). The unit consists: A heated aluminum top plate An adjustable electronic temperature control An adjustable electronic stirring speed control The unit meets these requirements: UL Listed for Class I, Group C, and D hazardous atmospheres Safe in hazardous situations where Class I, Group C and D flammable gases or solvent vapors can produce explosive or ignitable mixtures UL listed explosion proof; meets IEC1010 laboratory standard Thermostatic control Over-temperature safety control Product Highlights Stir solutions with a viscosity of 1200 cps at 400 rpm at 21.5 C Large, aluminum top plate surface 9.1" x 9.1" (23.2 cm x 23.2 cm) provides efficient heat transfer and excellent temperature uniformity. (Uniformity of top plate at 70 C (158 F) is ±2 C (±4 F) Electronic temperature control. Temperature range from 38 C to 220 C (100 F to 428 F) Precise electronic heat control maintains temperature stability within ±2 C (±4 F) Automatic over temperature safety switch cuts power to unit if top plate temperature exceed 280 C Sturdy construction allows maximum load capacity on top of the plate (25 lb or 11.3 kg) Stainless steel case is easily cleaned and maintained Designed for sparkless, hardwired connection. Unit has 45.7 cm lead wire and conduit attachment Optional dial thermometer, with 0 C to 300 C range, fits directly into top plate and measures surface temperature Meets all CE, UL and CUL standards Applications Heat and stir flammable chemicals or solvents (Class I, group C & D) Heat-treat and uniformly mix coatings Silicon wafer etching Quality control test viscosity of oil and water/organic content analysis
3 2 General Warnings Electrical Shock Hazard This unit must be installed by a qualified, skilled electrician familiar with installing explosion-proof electrical equipment in order to ensure compatibility of unit specifications to power source and grounding compliance. Warnings DO NOT use product for anything other than its intended use. DO NOT use metal foil on stirring hot plate. Use only with glass or stainless steel vessels. If using unit in hazardous atmospheres, keep enclosure chambers tightly sealed at all times to reduce the risk of ignition. Any maintenance or servicing of the unit should be done by a skilled professional or risk of personal injury may occur. General Specifications and Environmental Conditions General Specifications for the Explosion-Proof Stirring Hot Plate, Model SF87325 Dimensions Top plate Dimensions Overall (W x H x D) Weight Electrical ratings 9.13 x 9.13 (23.2 x 23.2 cm) 10 x 8.13 x (25.4 x 20.8 x 32.4 cm) 29 lb (13.2 kg) 120 volts 8.9 Amps 1,070 Watts Note The Explosion Proof Hot Plate Stirrer is UL listed explosion-proof for Class I, Division I, Group C and D locations where flammable gases or vapors are present in sufficient quantities to produce explosive or ignitable mixtures. The Group C and D classification specifies hazardous atmospheres containing either flammable gases or vapors of flammable liquids (see NFPA 497 and NFPA 321). Phase 1 Frequency 60 Maximum Load for top plate 25 lb (11.3 kg) Maximum temperature 218 o C (424 o F) Stirring speed range rpm Environmental Conditions Operating ambient temperature: 17 o C to 27 o C (63 o F to 81 o F) Relative humidity: 20% 80% (non-condensing) Storage: -25 o C to 65 o C (-13 o F to 81 o F) Relative humidity: 10% 85% (non-condensing) Altitude Maximum: 1.24 miles (2 km) Main supply voltage Maximum fluctuation: 10%; Installation category: 2; Pollution degree: 2
4 3 Hazardous Atmospheres Summary (partial listing) This table is intended to cover some of the chemicals/atmospheres designated as Class I, Group C and Group D in accordance with the National Electric Code, National Fire Protection Association (NFPA 70). This is not a complete list. For a more complete list of flammable chemicals, gases, vapors and dusts for electrical equipment in hazardous (classified) locations, go online to org and search NFPA 497. Warning To reduce the risk of fire or explosion, do not operate or install the Explosion-Proof Stirring Hot Plate where the marked operating temperature (T2A, 280 C) exceeds the ignition temperatures of the chemical vapors/hazardous atmospheres present. Group Chemical/Atmosphere Ignition Temperatures C Acetaldehyde 175 C, 347 F C Diethyl Ether 160 C, 320 F C Ethylene 450 C, 842 F C Unsymmetrical Dimethyl Hydrazine (UDMH) 249 C, 480 F D Acetone 465 C, 869 F D Acrylonitrile 481 C, 898 F D Ammonia 498 C, 928 F D Benzene 498 C, 928 F D Butane 288 C, 550 F D 1-Butanol 343 C, 650 F D 2-Butanol 405 C, 761 F D n-butyl Acetate 421 C, 790 F D Cyclopropane 503 C, 938 F D Ethane 472 C, 882 F D Ethanol 363 C, 685 F D Ethyl Acetate 427 C, 800 F D Ethylene Dichloride 413 C, 775 F D Gasoline C, F D Heptane 204 C, 399 F D Hexane 225 C, 437 F D Isoamyl Alcohol 350 C, 662 F D Isoprene 220 C, 428 F D Methane (Natural Gas) 630 C, 999 F D Methanol 385 C, 725 F D Methyl Ethyl Ketone 404 C, 759 F D Methyl Isobutyl Ketone 440 C, 840 F D 2-Methyl-1-Propanol 416 C, 780 F D 2-Methyl-2-Propanol 478 C, 892 F D Naptha (Petroleum Naptha) 288 C, 550 F D Pyridine 482 C, 900 F D Octane 206 C, 403 F D Pentane 243 C, 470 F D 1-Pentanol 300 C, 572 F D Propane 450 C, 842 F D 1-Propanol 413 C, 775 F D 2-Propanol 399 C, 750 F D Propylene 455 C, 851 F D Styrene 490 C, 914 F D Toluene 480 C, 896 F D Vinyl Acetate 402 C, 756 F D Vinyl Chloride 472 C, 882 F D Xylenes C, F
5 4 Unit Placement Electrical Shock Hazard This unit must be installed by a qualified, skilled electrician familiar with installing explosion-proof electrical equipment in order to ensure compatibility of unit specifications to power source and grounding compliance. Grounding requirements for hazardous areas are specified in Article 501 (and Article 250) of the National Electrical Code. Also, consult local electrical code requirements. All units are provided with an equipment grounding lead that should be used as the primary equipment ground connection for the unit. Cautions The Explosion-Proof Stirring Hot Plate is shipped with a wooden shipping support attached to the bottom that needs to be removed prior to permanent installation. Minimum allowable spacing between stirring hot plate and any vertical surface is one inch (2.54 cm). DO NOT install where the marked operating temperature exceeds the ignition temperature of the hazardous atmosphere(s) in order to reduce the risk of fire or explosion. Requirements The Explosion-Proof Stirring Hot Plate is designed for permanent installation. Permanent installation is made possible with integral mounting lugs and 1/2 (1.3 cm) conduit with 18 (45.7 cm) of lead wire provided. Allow space for ventilation. Electrical specifications are located on the back of the stirring hot plate. Consult customer service ( ) if your electrical service is different than that listed on the specification plate. The Explosion-Proof Stirring Hot Plate leads are factory sealed to meet the requirements of Article 501 of the National Electrical Codes (NEC). The Explosion-Proof Stirring Hot Plate must be hardwired per NEC (USA) or CEC (Canada) requirements. The installation must conform with installation requirements for electrical equipment intended for use in Class I, Group C and D hazardous locations as defined by the NEC and electrical code requirements of your area. Install on a level, sturdy surface. An external switch or circuit breaker needs to be included in the building installation in close proximity of the unit as a means to disconnect supply circuit. Over-current protection devices should be included in the installation. The unit can be connected to a branch circuit not exceeding 20 Amps. Operation Warning To reduce the risk of personal injury, DO NOT use this product for anything other than its intended purpose. The top plate uses a tubular heating element cast into an aluminum top plate. A primary electronic feedback control is used to regulate and limit the temperature of the plate under normal operating conditions. Should the primary electronic control fail, there is a secondary, bimetallic thermostat that controls the temperature. The secondary control will limit the top plate temperature to 280 C (536 F). An electronic control regulates the stirring speed. The stirring motor is enclosed in an explosion-proof casing. Together, the motor and a strong magnet provide excellent miscibility when used with a stir bar. The aluminum, explosion-proof enclosure houses all control and electrical connections.
6 Heating Specifications for Cast-in Tubular Heating Element Cautions Maximum load of the top plate is 25 lb (11.3 kg). The aluminum top plate is easily stained. Clean by wiping the top plate using a non-abrasive cloth lightly dampened with water. DO NOT use a wire brush to clean the unit. Using a wire brush will modify the integrity of the surface and it could affect your heat stability. Heating Metal Vessels Note Dial marks for heat control knob settings are for reference only. The dial marks indicate approximate hot plate temperature in C (±15 C). It takes 60 minutes for a one liter flask, filled with 600 ml of water, to vigorously boil when the maximum set point is 230 o C (446 o F). Hot Surface Caution: Hot Surface. Avoid Contact. The top plate will remain hot for some time after the unit is turned off without any visual indications that it is still hot. 5 Metal vessels may be heated safely on the unit without the danger of the vessel reflecting enough heat back to the top to cause the aluminum to soften. The internal electronic control will regulate the aluminum top plate temperature. Heating Specifications Temperature range at the center of hotplate 38 C C ± 3 C Temperature cut-off 235 C ± 9 C Setting the Temperature Turn the Dial Control Switch clockwise to the desired temperature. Dial marks indicate approximate surface temperature in C. When the temperature for a given dial setting has been reached, the control will regulate the hot plate. To turn OFF hot plate, turn dial switch fully counterclockwise to the OFF position. Heat-up time to maximum temperature (218 C, unloaded top plate) Temperature stability at center of top plate surface at 70 C: Temperature stability at center of top plate surface at 218 C Uniformity of top plate surface at 70 C (center to 1 or 2.54 cm from corners) Uniformity of top plate surface at 218 C (center to 1 or 2.54 cm from corners) 16.5 minutes at nominal voltage ±1 C ±3 C ±2 C ±10 C Warning To prevent ignition of hazardous atmospheres, the aluminum explosion-proof enclosure chambers must be kept closed, with screws securely tightened, whenever the unit is in operation and/or connected to power supply circuit. Temperature cycling over a temperature range greater than 5 C with a period of approximately 6 minutes may be observed when operating unit at 220 C or higher. If such cycling is observed, the unit is functioning under abnormal or fault conditions and the secondary bimetallic thermostat is controlling the top plate temperature. If this occurs, do the following: 1. Turn unit OFF at both the heat and stir dial switches and the external circuit breaker 2. Allow unit to cool completely. 3. In an atmosphere absolutely free of flammable liquids, gases, and/or vapors, test the heat control function of the unit at several temperature settings within the range of 38 C to 220 C. If the top plate temperature of the unit again cycles with a period of approximately 6 minutes over a temperature range greater than 5 C when ramping to or operating at 220 C, call customer service at To prevent ignition of hazardous atmospheres, do not use electrical equipment such as a thermocouple or pyrometer to monitor the hot plate temperature unless it is UL listed for the same hazardous atmospheres and temperature rating as the unit. The thermocouple and pyrometer could serve as a source of ignition.
7 Stirring Speed Specifications 6 Note Speed range is rpm, dependent upon viscosity of solution used. Stability of the stirring speed setting using a 4 liter flask with 2 liters of water is ±3 rpm. Maximum flask size is 4 liters. Dial marks for speed control knob settings indicate approximate RPMs only (±20 rpm). Setting the Stirring Speed The power switch for the stirrer is turned ON/OFF by using the stir dial switch. Power is ON when stir dial is turned clockwise, past the zero OFF mark (0). To set the stir control to desired speed, tum dial switch clockwise until the dial pointer is aligned with the selected dial mark (indicating rpms). Stirring Speed Guide Flask Size 1 L Stir Bar Size Amount of Solution 1 L ml Viscosity Maximum Speed* 600 ml Water 1,200 rpm 1 L 600 ml Corn oil 1,200 rpm 500 ml 350 ml 30 weight motor oil 1,265 centipoise viscosity std. 950 rpm 400 rpm *Maximum speed obtained without the stir bar losing coupling with the Plate magnet. 1 L 350 ml Light corn syrup 70 rpm Resetting the Stirring Motor When the Over-Current Protection Device is Activated The stirring motor is equipped with an over-current protection device. Should this device be activated, the stirring motor will shut off. To reset the motor: 1. Turn unit OFF at both the dial power switches and the external circuit breaker. 2. Allow unit to cool. 3. Turn the external circuit breaker back on. If the over-current protection device is repeatedly activated during normal operation, please call Customer Service at Maintenance Cautions The unit does not contain serviceable parts. Repairs should not be performed on this product, due to the risk of the ignition of hazardous atmospheres. Due to the nature of this product, operator safety will be endangered should maintenance or servicing be performed on it by the operator.
8 Electron 7 Microscopy Sciences For any questions or for ordering information, please contact Customer Service at Thank you for choosing! P.O. Box Industry Road, Hatfield, PA 19440
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