Temperature Control Solutions - Labo Plus

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Technical Information | Selecting a Circulating Bath Fluid Temperature (°C) Fluid Temperature (°C) Selecting a Circulating Bath The best PolyScience Circulating Bath for your application will depend on a number of factors. Here are some guidelines to help with your selection: 1. Working Temperature and Stability – You will need a Refrigerated/Heated Circulator if your working temperature will ever be near or below ambient. Applications that require maximum temperatures above 160°C or ±0.01°C temperature stability require Circulators with Performance or Advanced Series Temperature Controllers. 2. Cooling/Heating Demand – A Circulator with a small reservoir is generally suitable if you require external circulation only and the heating/cooling Circulating Bath Heating and Cooling Performance 60 Hz Circulating Baths 100 80 60 40 20 0 50 Hz Circulating Baths 100 80 60 40 20 0 7 Liter 15 Liter 20 Liter 7 Liter 28 Liter Time (min) 0 20 40 60 80 100 120 Time (min) 122 | Phone: 800-229-7569 • +1-847-647-0611 15 Liter 45 Liter 45 Liter 20 Liter 28 Liter 0 20 40 60 80 100 120 Cooling Capacity Cooling Capacity (W) Fluid Temperature (°C) Fluid Temperature (°C) 1500 1250 1000 750 500 250 0 -40 40 30 20 10 0 -10 -20 60 & 50 Hz Cooling Capacity Heating Rates Cooling Rates demand is moderate. If the external heating/cooling demand is high or you will be putting samples in the internal reservoir, a Circulator with a larger reservoir will be required. 3. External Circulation – All PolyScience Temperature Controllers can be used for close-loop external circulation. If open-loop external circulation is required or if your application requires a flow rate above 3 gpm (11 l/min), a Circulator with a Performance or Advanced Series Controller is required. 60 & 50 Hz Circulators -30 -20 0 20 Temperature °C 07R-20 & 7LR-20 -30 0 50 100 150 Time (min) 15R-30 60 & 50 Hz Circulators 40 30 20 10 0 -10 -20 -30 -40 -50 0 50 100 150 Time (min) 7 Liter -20 45R-20 28R-30 15R-40 45 Liter -20 15 Liter -40 15, 20, 28 Liter -30 7 Liter -40 200 200 20R-30 7LR-40
A Quick Guide to Tubing and Fittings PolyScience offers a variety of tubing and fittings for use when using your Circulator to control the temperature of an external bath or device. Here are some guidelines for selecting the best tubing and fittings for your application: Materials Buna N Tubing — A synthetic (nitrile) rubber, Buna N is able to withstand temperatures from about -40° to +120°C and performs well with ethylene glycol, propylene glycol, mineral oil, and water. Viton ® Tubing — A synthetic rubber and fluoropolymer elastomer, Viton ® has a broad operating temperature range (-32° to +200°C) and a chemical compatibility similar to Buna N. Braided Teflon ® Tubing — This high-strength tubing consists of an extruded Teflon ® core with an outer stainless steel braid. It can handle extreme temperatures (-50° to +225°C) and pressures and also offers excellent chemical compatibility. Available in 1 m (39") lengths only, braided Teflon ® tubing should be used in applications where the distance between the circulator and external device is relatively short. Each end has a male 1/4" pipe to 1/4" tube connector which can be quickly connected and disconnected. Stainless Steel Fittings — Stainless steel fittings can handle extreme temperatures while also offering good chemical resistance. PolyScience Performance Series Temperature Controllers are shipped with stainless steel fittings. Nylon Fittings — Their somewhat better chemical resistance to low temperature bath fluids than brass fittings make nylon fittings an excellent choice for applications where fluid does not exceed 90°C. Nylon fittings are standard equipment on PolyScience Advanced Programmable, Advanced Digital, and Standard Digital Temperature Controllers. Brass Fittings — Strong and durable, brass fittings offer excellent corrosion resistance. They are best suited for low temperature applications (below 80°C). Tubing & Fitting Temperature Ranges Temperature (°C) Buna N Tubing Viton ® Tubing Braided Teflon ® Tubing Stainless Steel Fittings Nylon Fittings Brass Fittings Bypass Kits PolyScience Circulating Baths are equipped with a Buna N bypass tubing kit that connects the Temperature Controller’s inlet and outlet ports. It improves performance when external circulation is not needed. A Viton ® bypass kit is available for high temperature (120°C and above) applications. Fluid Compatibility Material of Construction -50 0 50 100 125 150 200 225 Buna N Tubing Viton ® Tubing Braided Teflon ® Tubing Nylon Fitting Brass Fittings polycool EG -25 (ethylene glycol) A A A A B B polycool PG -20 (propylene glycol) A A A B B polycool HC -50 (water-based heat transfer fluid) B B A B B B polytherm S150 (silicone oil) B B A B B polytherm S200 (silicone oil) B B A B B polytherm S250 (silicone oil) B B A B B polytherm M170 (mineral oil) A A A B A polycool MIX -25 (glycol-based coolant) A A A A B B polyclear MIX 30 (distilled water plus algaecide) A A A A A A A = Excellent; B = Good -40° to 120°C -32° to 200°C -50° to 225°C -45° to 225°C -40° to 90°C -40° to 80°C Stainless Steel Fittings www.polyscience.com | 123
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Temperature Control Solutions Circu
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Connected. Not just listening to cu
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• Large bath opening Access has b
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Features: • Intuitive touch-scree
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On-Screen Help Feature Provides inf
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Absolute Precision Our most precise
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Precise Maintains temperatures from
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Exceptional Performance Designed to
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Optimized The Advanced Digital Temp
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closed loop PG 25 Reliable Set and
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Versatile The MX Temperature Contro
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Performance Digital Advanced Digita
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Features: • Quiet Proprietary pat
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15 Liter 15 Liter 20 Liter 28 Liter
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7-Liter: -20°C, Low-Profile Temper
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Features: • Intuitive Whether equ
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Reservoir Size 6 Liter 10 Liter 20
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Reservoir Size 8 Liter 11 Liter 14
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Open Tanks Stainless Steel Open Tan
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Temperature Control Solutions - Labo Plus

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