Static Eliminator Stand with Two Ionizers
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Neutralize static charges on membrane filters with one brief pass over this ionizing static eliminator. Simplifies membrane handling and eliminates attraction for foreign particulates. Excellent for Polycarbonate and Polyester membranes. *Contains Polonium 210.
Their small profile makes them an ideal solution for in-balance static elimination. They eliminate the problem of “fly-away” powders and inaccurate measurements in analytical and precision weighing applications as well as semiconductor, In-Tool, glovebox and forensic environments
Feature Highlights
- Small and conveniently portable
- No shock hazard
- No external power supply
Benefits
- More accurate measurements
- Static free samples
- Fits easily into small spaces
| Activity | 0.5 mCi (18.5 MBq) |
| Balance | :±0 V |
| Dimension |
0.25in W x 0.93in H x 3in L (6.4 mm x 23.6 mm x76.2 mm) |
| Effective Distance | 1 in – 2 in (25.4 mm -50.8 mm) |
| Enclosure | Stainless Steel |
| Technology | Alpha |
| Weight | 0.4 oz (11.34 g) |
| DECAY RATE | .44 seconds grounded (±1000 to 100V), @ 1 inch |
*Maintenance: It is necessary to replace ionizers every 12 months to maintain peak effectiveness.
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Frequently Asked Questions
Q: What is the difference between hydrophilic and hydrophobic membrane filters?
The pores of microporous membrane filters act as small capillaries. When hydrophilic membranes come into contact with water, capillary action associated with surface tension forces causes the water to spontaneously enter and fill the pores. In this manner, the membranes are easily wetted and allow the bulk flow of water through the pores. Once wetted, hydrophilic membranes will not allow the bulk flow of air or other gasses, unless they are applied at pressures greater than the membrane’s bubble point.
Hydrophilic membrane filters are typically used with water and aqueous solutions. They can also be used with compatible non-aqueous fluids. Hydrophilic membrane filters are typically not used for air, gas or vent filtration since the filters would block flow if inadvertently wetted, by condensation for example.
When hydrophobic membranes come into contact with water, surface tension forces act to repel the water from the pores. Water will not enter the pores and the membranes will act as a barrier to water flow, unless the water is applied at pressures greater than the membrane’s water entry pressure. Low surface tension fluids, such as alcohols, can spontaneously enter and fill the pores of hydrophobic membranes. Once all the air in the pores is displaced, there are no longer any surface tension forces and water can easily enter the pores, displace the low surface tension fluid, and pass through the membrane. The membrane will then allow bulk flow of water for as long as the pore remain water filled. If the membrane is allowed to dry (i.e. air enters the pores), then it must be pre-wet with a low surface tension fluid again prior to use with water.
Hydrophobic membrane filters are typically used with compatible non-aqueous fluids. They are also commonly used as air, gas, or vent filters. Hydrophobic membrane filters are sometimes used with water or aqueous solutions; and, in these applications, they must first be prewet with a low surface tension, water miscible fluid prior to use.
Q: How do I dispose of the static eliminator?
In the USA, these devices are considered exempt by the NRC and technically can be thrown in the trash when expired, however we prefer that they be returned to us and properly disposed of. If a customer is throwing them in the regular trash, we ask that any radioactive wording or labelling be covered with black permanent marker to alleviate any unnecessary panic if the device is found. Thus the reason we, and the majority of our customers prefer to return them to us.
In Canada, they are not considered exempt by the CNSC, and therefore would have to be returned to us for proper disposal.
Please contact us for the Return Shipping Instructions.
Q: Are tweezers required for handling membrane filters?
The membrane filter tweezers offered at https://www.sterlitech.com/stainless-steel-membrane-filter-tweezers-pad-tip-ends.html are recommended for handling membrane filters to minimize the potential for contamination and damage. However, the tweezers are not mandatory and most membrane filters can be installed by hand. Gloves are recommended when handling membrane filters to avoid contamination with skin oils.
Q: Why is removal of static charge beneficial when working with Track Etched Membranes?
The polyester track-etch (PETE) membrane filters and polycarbonate track-etch (PCTE) membrane filters are among the thinnest membrane filters that we offer. They are more susceptible to accumulating electrostatic charges which can make them difficult to manipulate and position. The static eliminators offered at https://www.sterlitech.com/static-eliminator.html can be used to mitigate handling problems associated with electrostatic repulsion and static cling.
Q: What is the difference between nominal and absolute pore size ratings?
Nominal pore size ratings provide a general indication of filter retention efficiency, meaning some particles equal to or larger than the stated pore size may pass through the filter. Nominal ratings can vary by manufacturer, so filters with the same nominal pore size may not offer equivalent filtration performance.
Absolute pore size ratings are determined through controlled particle or microbial retention testing and represent the smallest particles that are consistently retained by the membrane. These ratings are often correlated with bubble point specifications and are generally more comparable across manufacturers.
Important: Actual filtration performance depends on application conditions, even when using filters with absolute pore size ratings.
Q: What is the difference between pore size and porosity?
The pore size refers to the diameter of the individual pores in a membrane filter. Pore size is typically specified in micrometers (µm). Most membranes and filter media actually contain a distribution of pore sizes. Nominal pore size ratings typically refer to the predominant pore size of a filtration media; pores larger and smaller than the nominal rating may be present. Absolute pore size ratings typically refer to the largest pore size of a membrane and it is expected that all pores will be equal to or smaller than the absolute rating.
For the polycarbonate track-etch (PCTE) and polyester track-etch (PETE) membrane filters, porosity is the percent of the total surface area occupied by the pores; it typically ranges from <1% to 16%. For the other membrane filters, porosity is the percent of the total volume occupied by the pores; it typically ranges from 40 to 80%.
Q: How do I determine if my filter is compatible with my application?
You can find the Sterlitech compatibility guide. It is important to realize that application conditions, such as operating temperature, affect compatibility. Please contact us at [email protected] if you need assistance.
Q: What is a bubble point and how is it determined?
The bubble point is the minimum amount of pressure required to push air bubbles through the largest pore of a wet membrane. The bubble point is inversely proportional to the pore diameter, as the pore diameter decreases the bubble point increases and vice versa.
Retention efficiency of membrane filters can be directly measured by challenging the filters with suspensions of standard microorganism cultures or particles of known size. Unfortunately, such efficiency testing is necessarily destructive. However, since retention characteristics are dependent on pore size, it is possible to correlate destructive challenge testing results to non-destructive membrane bubble point tests. In this manner, the relationship between membrane pore size and membrane bubble point is empirically determined. Typically, a minimum bubble point can be determined and specified for a particular pore size rating. The bubble point specification is then used for quality control during membrane manufacture. The bubble point can also be used by the consumer as a nondestructive test to verify membrane integrity before and/or after use.
Q: What is the difference between a depth filter and membrane filter?
Depth filters are constructed with relatively thick filtration media and typically have nominal pore size ratings >1µm. Due to their large void volume, they capture significant amounts of particulate within their pore structure.
Membrane filters are typically composed of polymers that have been chemically processed, resulting in highly porous thin films with microscopic pore structures. Membrane filters typically have absolute pore size ratings <1µm, with some exceptions. Because of their very fine pore structure, membrane filters tend to trap the majority of particles on the surface. However, smaller particles with diameters near or below the pore size rating can be captured within the membrane or pass through the membrane.
