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Lab Armor Support |
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1.Are Lab Armor Beads packaged as ready-for-use? Yes, Lab Armor Beads arrive in a sealed container ready to add to your thermal instrument.
2. How much Lab Armor Beads do I need? Can try the 200 ml Test Drive in my water bath? Unlike water, Lab Armor Beads don't evaporate and therefore helps protect against instrument overheating and burnout. But, like water, it is important to add a sufficient volume to your bath to ensure safe operation. An insufficient volume can cause inaccurate thermostat readings, which can result in continuous heating of the bath. Most water baths operate properly when filled to 1/2 to 3/4 full. Use the Lab Armor Beads calculator to help you determine the optimal volume for your water bath.
3. How long can I use Lab Armor Beads under normal conditions? Under normal conditions, Lab Armor Beads should last the life of the water bath. If used incorrectly, the surfaces of Lab Armor Beads can become damaged, resulting in a loss of fluidity of the bath, but not in thermal performance. We recommend that you avoid strong detergents, acids and bases. Bleach, for instance, may tarnish the surface of the Lab Armor Beads reducing its fluidity and overall performance.
4. Can I autoclave Lab Armor Beads? We recommend that you avoid autoclaving Lab Armor Beads, unless you autoclave in a sealed, moisture-proof container. The high temperature steam can cause the surface of the Beads to become sticky, reducing its fluidity and overall performance. Should you need to disinfect, spray the Beads with 70% ethanol and mix.
5. Can Lab Armor Beads be used in a standard heat block? Yes, Lab Armor beads are compatible with all standard heat blocks. You will no longer need to buy a new aluminum block when a vessel doesn't fit.
6. What if something is spilled into the Lab Armor Beads? Lab Armor Beads may be washed with dish detergent and water, then sprayed with 70% ethanol if necessary. Most importantly, be sure to completely dry the Beads before adding back to the water bath, because a combination of heat and water can tarnish the beads. You can use a mesh strainer to wash and dry. A nylon <1/4" mesh bag works well, such as a camping stuff sack that you can find at a camping supply store. See question 11 for more details.
7. Do I need to use the water bath instument cover with Lab Armor Beads? Yes, it is best practice to use the cover whenever possible. The cover allows maximum temperature range and helps maintain better temperature uniformity. In general, without the cover in place, the surface of the Beads will be slightly cooler due to the movement of cooler air over the bath.
8. Do temperature gradients exist in a water bath? Yes, all water baths have hot spots and temperature gradients. The extent of the gradient depends on the design of the water bath. In some baths, for instance, the heating element is small or is not centrally located. In others, the heating element expands the entire surface of the bath providing a more uniform heating capacity. Lab Armor Beads perform like water and the temperature gradient in a standard water bath is very similar as well, usually +/- 2.5ºC. However, for higher precision applications, the new Lab Armor Bead Bath performs at +/- 0.5ºC. One advantage of Beads is that a sample vessel can be completely submerged in the beads, eliminating exposure to surrounding air temperature.
9. Is my water bath compatible with Lab Armor Beads? Lab Armor Beads can be used with just about any water bath. But, as mentioned in question 9, like water, the performance of the thermal media depends on the design of the bath and the location of the heating element. With water, for example, "hot spots" occur in areas of proximity to the heating element. Some elements are exposed on the bottom of the bath and others are recessed. Some baths are deep and others are shallow. In a bath with the element located in the center, water and Beads generally produce a temperature gradient of +/- 0.25 -0.75 ºC per inch in all directions from the middle of the bath. So, depending on the size and location of the element, as well as the dimensions of your bath you can gauge the performance of Beads in your bath.
10. How do I keep my Lab Armor Beads shiny and fluid? Normal amounts of precipitation on refrigerated bottles and vials are NOT harmful. However, avoid exposure to a combination of heat and water or reactive chemicals that oxidized the surface of the Beads. Chemically accelerated oxidation reduces the Bead's shine and more importantly, it's fluidity. In general, Beads can last for many years if kept relatively dry and clean. It can even out-live your water bath.
11. IAre Lab Armor Beads compatible with every bath despite different heating and cooling systems? Water baths from several major US manufacturers, including the Thermo Fisher & VWR baths have been tested with Beads. Data shows that most baths are compatible, no matter their age. An exposed or recessed thermocouple does not seem to affect the performance of the Beads. However, the location and configuration of the heating element can make a difference in heating uniformity. Most of the water bath design problems affecting Bath Armor performance, also affect the thermal performance of water. Circulating water baths are generally incompatible with Beads.
12. How do Lab Armor Beads perform under high or low temperatures? Beads have been tested using various water bath models at a range of temperatures. In most traditional water baths, the further the set temperature is from ambient temperature, the greater the thermal gradient will be in the bath. Therefore, at an operating temperature of 37ºC to 42ºC, the thermal gradient in a common water bath is typically +/-1-3ºC, whereas at 55-65ºC it is closer to +/-3-8ºC depending on the design of the bath and the amount of Lab Armor Beads used. For applications that require greater temperature control, a Lab Armor Bead Bath can be used. Bead Bath is designed specifically for use with beads, and therefore provides more consistent, uniform temperatures throughout the bath compared to traditional water baths. Thermal uniformity is +/- 0.5ºC at 37ºC and +/- 1.0 at 65ºC. For more information about the Lab Armor Bead Bath, visit http://www.labarmor.com/beadbath.html
13. Are there ways to speed up the heating process with Lab Armor Beads? Incubating: Beads warm 1.25-2.5X slower than water, depending on the volume of the vessel. But, there are ways to compensate for this:
For example, to raise the temperature of a typical 500 ml bottle of cell culture media from 4ºC to approximately 37ºC in 30 minutes, traditionally, a 37ºC water bath is used. To accomplish the same results using Beads, the bottle can be submerged in 50ºC Beads for the same 30 minutes, then pulled out and placed onto the surface of Beads. The Bottle of media will remain at 37ºC +/- 2ºC for up to 6 hours until use. When a frozen vessel is placed into the bath, the beads surrounding the bottle become temporarily cool. And if the vessel is large enough, just like a water bath, the overall temperature of the bath will decrease slightly below the set point and trigger the bath to begin heating. The cool areas surrounding the bottle will slowly warm up until the bottle reaches the set temperature. Although similar gradients are produced in water baths, in general, the whole bath cools down and re-warms without obvoius gradients because of normal disturbances and stirrings, as well as natural thermal circulation of water. Instead of always stirring the bead bath, customers can most likely solve their problem with a simple change in protocol. By allowing frozen vessels to thaw overnight in the refrigerator to 4ºC before placing it in the bath, it will warm quickly in the bead bath and will not contribute greatly to cooling the bath and disturbing the temperature gradient.
14. Besides keeping the bath cleaner, how do Beads protect samples better than water?
15. Is an air-jacketed water bath compatible with Lab Armor Beads? In general, air-jacketed baths provide better overall heat distribution and temperature gradients. The air jacket that surrounds the tub portion of the bath allows the heated air generated by the heat element at the base of the tub to also warm the walls of the tub. Since bead baths primarily rely on heat conduction (heat transfer by contact), baths with heated walls transfer heat to the beads from 4 directions. Baths without air jackets less efficiently heat the beads from the bottom only. There is another potential design problem with some non-air-jacketed baths. If the bath's heating element is not recessed below the tub, but it is instead fixed to the tub by metal-to-metal contact, the base of the bath can become very hot in areas where contact is made. This produces hot spots on the bottom, which results in uneven gradients in the bath. Small sized heating elements that only cover a small portion of the base of the tub makes this problem worse. Such baths produce hot spots even when water is used. If you are experiencing problems with your non-air-jacketed bath, as an alternative to buying a new bath, simply add a container of beads to your laboratory oven or incubator. A container such as a stainless steel pan with 3-4" walls can be filled with beads and placed into the heating unit. The container of beads will work great with a minimal gradient. Such a container can be added to a standard incubation oven, a cell culture incubator, or a refrigerator for cold incubations.
16. Can Lab Armor Beads be used for an ice bath without the Chill Bucket or other parts? There are a number of different ways to use Beads. Many customers place containers of Beads in their refrigerators, incubators and ovens. When creating an ice bath, one goal is to keep the beads dry. So its a good idea to separate the beads from the ice packs, which accumulate condensation. We recommend using some kind of mesh wire or fabric. Also, any condensation that builds on the surface of the beads will be able to drip through the mesh. Its important to keep the beads from soaking in water for extended periods of time. Besides attracting contamination, excessive water contact will tarnish the surface of the beads and reduce the fluidity of the bath. Also, as an alternative to ice packs, dry ice can be used to make a colder bath (<0 ºC).
17. Are the Beads safe? The beads do not contain any dangerous elements that will contaminate your environment or pose health risks. The beads are manufactured and batch analyzed by metal optical emissions spectrometry. Lab Armor maintains strict quality controls on all its raw materials and manufacturing outcomes. The beads are designed to be used safely at both low and high temperatures, even up to 350ºC to replace oil in silicone oil baths.
18. How do you deal with the fact that you cannot shake or agitate samples in bead baths? A shaker unit is still required for large bottles or flasks that need high rpm agitation, such as 250 ml flasks for bacterial cultures. But for low speed agitation, a standard laboratory rotator (such as a Lab-Line Maxi Rotator), a bead tray, and an general-use incubator, can replace a shaking water bath. Here's how it works: Option 1) Samples are added to a StayTemp tray that is placed atop a rotator inside a standard laboratory incubator and agitated at the desire temp. Option 2) Warm beads from a Bead Bath can be scooped into an insulated WalkAbout tray and samples can be rotated on the bench top, outside the incubator for 0.5 to 1 hr at temperature. We can provide larger insulated trays for bottles and flasks too. In an incubator, the beads actually transfer thermal energy more efficiently to the samples than by air alone. And the beads stay at temperature ensuring consistent incubation despite folks opening and closing the incubator door repeatedly.
Do you have a question not found in this website? |
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Revive Your Lab™ Call (800)-210-8612 © 2010 Lab Armor, Inc. All rights reserved. "Lab Armor"and "Bead Bath" are trademarks of Lab Armor, Inc. Lab Armor™ Beads and Baths are subject to pending patents. San Antonio, TX |
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