For over 30 years, researchers have depended on Talboys overhead mixers to deliver performance, durability, and quality at an economical price. From general purpose, light duty mixing to heavy duty, high viscosity mixing, Talboys has a mixer for your laboratory's application. With our extensive offering of mixing paddles, stands and clamps, you're sure to find a complete mixing solution from Talboys.

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There are a number of factors to consider when choosing the most efficient overhead system for your needs and requirements. Talboys recognizes these needs and has created a checklist of critical components for our customers to review when making such a purchase.

Step 1: Helpful Tips on Choosing the Paddle that Best Meets Your Needs

We realize that selecting the proper paddle can be a frustrating process, but Troemner has devised a method that will help you choose the best solution for your needs. Experimentation is the key to finding exactly what you need. A blend of experimentation and your own experience will reward you with the answer you need for your projects.

The critical factors to consider when selecting a paddle include:

• the viscosity of the fluid
• the power of the stirrer you are using
• the amount of agitation desired
• the volume of fluid to be mixed
• the speeds at which you must mix
• the size and shape of your vessel

It is pertinent to keep in mind that slow speed mixing is more efficient than high speed mixing. High speed mixing may tear a hole in the center of the fluid, generally resulting in high local agitation and lower overall agitation.

The volume and shape of the vessel has often been overlooked when selecting a paddle. These two attributes, however, are very important. Here's why:

• Will the selected paddle fit into the opening in the vessel?
• Is the fluid volume suited to the vessel so that there is sufficient depth to mix properly?
• What is the volume in comparison with the power of the stirrer/paddle combination? The following analogy best explains this: an outboard motor has little, if any, effect in the ocean, but if that outboard motor is operating in a fifty-five gallon drum, the agitation is significant.

The power required to drive a given stream of fluid is a function of rpm and the paddle diameter. Selecting a 3-1/2" propeller over a 2" propeller will produce more than sixteen times the load seen by the stirrer. An extra propeller added to the shaft will produce greater agitation but limit the load on the motor.

Step 2: Helpful Tips on Choosing the Stirrer that Best Meets Your Needs

Selecting a stirrer is very similar to buying a new car. The options you select will be based on your needs and how much you can afford to pay for them.

When choosing a stirrer that will be used for very generalized requirements, select a model that provides the greatest versatility yet fits within your budget. If you have a specific stirring issue, the selection process becomes more difficult. Listed below are some ways to find the best stirrer for your needs, even when your project is a bit complicated.

• Choose a paddle that produces the desired agitation.
• Ensure that the stirrer you choose turns the paddle at the needed speed. This will be a trial and error process, especially if there is a load change during the stirring operation.
• Use the motor's torque ratings to select the best stirrer. Torque combines the function of horsepower and speed, so you can gain valuable insight from such an evaluation.
  

An Explanation of Torque and Horsepower

When measuring horsepower, the torque increases as the rated motor speed decreases and vice versa. This statement is true only if the output speed is changed by mechanical means, such as gear reducers. Electronic speed controls will not change the torque.

• Many speed controls reduce motor speed while they reduce the torque.
• Transistorized SCR type speed controls, like the Talboys Transi-Stir Control, reduce motor speed, but the torque remains constant.
• Gear reducers reduce the speed while causing a directly proportional increase in torque. The horsepower remains constant.

The horsepower rating of a motor is the maximum available horsepower of that motor. The running conditions of a stirrer can be confirmed by measuring speed with a tachometer or a probe and by measuring the motor current with an ammeter. The volume of fluid being agitated has little influence on the size of the motor required, but should be considered when selecting the paddle.

Your current project specifications, your experience, and your laboratory supplies distributor will be helpful in ensuring that you find the best solution to your needs. If you are still having trouble determining which stirrer will best fit your project, Troemner's customer service department is available to assist you with your purchase. Please call 1-888-TALBOYS.

Types of Speed Control

Electronic Speed Control
The Talboys electronic speed control is a compact, low cost speed control chosen for its reliability. This solid-state electronic voltage control offers:

• Variable speed over the motor range.
• An engineering design that withstands a 300 percent overload.
• Minimal heat production.

Transi-Stir Speed Control
The Talboys Transi-stir speed control is a solid-state controller, similar to the electronic speed control. It provides:

• The ability to maintain desired speed even when there are changes in viscosity.
• Capabilities to sense increased resistance, thus sending more speed to maintain momentum.
• Full motor torque over a wide range of speeds. The result is more torque over a wider speed range than with other types of speed control.

Overload Protection

Some model stirrers offer an internal thermal overload protection cut-off. This will be noted in the product descriptions. When the motor gets too hot, the cut-off feature shuts down the motor. Once it has cooled, the motor will restart.

CAUTION:

• If the cut-off stops the motor, be sure to turn the switch to OFF and determine why the motor went into overload. All model stirrers (with the exception of Models 105 and 107) are equipped with fuses as an integral part of the circuitry. A current overload will blow the fuse and shut off the motor.
• Any blown fuse should be investigated. It is possible to blow a fuse by turning on the power to a unit with the speed control set at any value above zero. Be sure to set the speed at zero before flipping the switch. Never use the power cord to start and stop the unit.

Overseas Voltage

Several Talboys mixers are available in 230 Volts for overseas usage. Models 238 and 429 are available in 230V. Other models, which are available in 230V, can be shipped by special order. These 230V stirrers are sold without power cord plugs. Please contact Troemner at 1-888-TALBOYS for further details and delivery information.

PTFE Coating

Many of the Talboys accessories are available with PTFE coating. The PTFE resists many laboratory substances. The PTFE used is generally between 0.001" and 0.002" thick.

Flammables

Talboys stirrers are electric, but they are not explosion-resistant. The overhead stirrers should never be used with flammables. Use of an electric stirrer in a hazardous location can cause fire and/or explosion resulting in operator injury and damage to facilities. Troemner does not assume liability for such damage.

Warranty

Talboys stirrers come with a two-year limited parts and labor warranty. Warranties are not available for brushes, springs, gears, and other minor equipment because they are normal maintenance components.

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