The first thing you need to do is download a credit application. Then fax it in. New accounts usually take 2-3 days to open after we receive the complete application. You may order and pay by credit card before your account is open.
Products listed on this website are available for sale in the USA only. If you are located outside the USA, please use the Locate a Sales Representative page for information on how to purchase Zefon products locally in your area.
Is a copy of your printed catalog available online?
What is the CVV2 number you are asking for on my credit card?
CVV2 is a new authentication scheme established by credit card companies to further efforts towards reducing fraud for internet transactions. It consists of requiring a card holder to enter the CVV2 number in at transaction time to verify that the card is on hand.
VISA & MasterCard
This number is printed on your MasterCard & Visa cards in the signature area of the back of the card. (it is the last 3 digits AFTER the credit card number in the signature area of the card).
American Express cards show the cvv2 printed above and to the right of the imprinted card number on the front of the card.
When will my order ship?
Orders of in-stock items (including those marked "normally ships within 24 hours") are shipped the same day if received by 2:00PM EST. Orders received after 2:00PM EST and after hours will be shipped the next business day.
All products in our store are marked with a stock status indicating when you should expect shipment to occur. If any of the items you ordered will not be able to ship within the time specified, we will contact you with an expected availability date.
Will you notify me when my order ships?
Regardless of how you place your orders, if you provide us an e-mail address when placing your order, you should receive an e-mail notification when your order ships with the package tracking numbers.
If you placed your order on zefon.com, you have the added benefit of a zefon.com account. Your zefon.com account provides the most up to date status and allows you to see all the orders you have placed through zefon.com, the status, tracking information and any previous orders you have placed on zefon.com.
Do you have any local distributors of your products?
If there are multiple methods for the chemical you are sampling, it is your discretion which one you use. Keep in mind that if you are sampling to comply with OSHA regulations, any inspector will use the OSHA method to determine compliance.
Why am I required to send in sample blanks?
Sample blanks are required as a quality assurance measure in your air sampling program. They help ensure the integrity of your samples by identifying any background levels of the contaminates being sampled
I have detected some trace levels of metal in one of your cassettes used to sample for metals. Is there any criteria on what levels are acceptable?
Various trace metals will show up in filter membranes from time to time. This is why the sampling method requires sample blanks. By using the trace amounts from the sample blanks and subtracting this from your sample amount, you have the most accurate reading.
I have lost the weight off my pre-weight cassette label. Can you help?
Maybe. If you have the serial number on the label, we may be able to look it up. If you do not, unfortunately, there is not much we can do. Please contact us if you have the serial number and need a weight reference.
Why is the top filter lighter than the bottom filter on my match weight cassette, resulting in a negative weight?
Match weighed cassettes have the filters matched within a specified amount (20, 50 or 100µg). If the sample amount collected is less than the difference in weight of the 2 filters, it is possible to have a negative weight if the heavier filter is on the bottom. This is not an error in the product. This would be an indication that either not enough of a sample was taken or it is a very clean environment.
Does the colored band on my match/pre weighed cassettes mean anything?
Yes, it does. The cassettes are color coded to identify the type of filter inside the cassettes. This is done for easy identification by field personnel. The color codes are as follows:
Blue: 0.8µm MCE Filter
Red: 5.0µm PVC Filter
Do cassettes or filter membranes ever go bad or expire?
Over time, filter membranes naturally will degrade. Although we do not specify an expiration date on most products, Zefon recommends using the product within 18 months of the date of purchase along with storage at room temperature in a climate controlled room to ensure the best performance. Note: This does not apply to product which have a specific expiration date (e.g. Air-O-Cell® or Via-Cell®).
Who actually makes the cassettes that you sell?
All air sampling cassettes sold by Zefon are manufactured by Zefon. Beginning from the processing of the raw plastic to the finished product, Zefon handles it all the way. This allows us to control the quality very tightly.
What is the purpose of the numbers and bar codes printed on some cassettes?
The number is a non-repeating serial number that is provided to you for traceability purposes and sample identification.
How can I calibrate my pump?
The best (and most accurate) way to calibrate a pump is with a 'primary' calibration device. These devices include bubble meters/tubes, dry gas meters an piston calibrators including the Bios Defender, the Gilian Gilibrator, Zefon DigiCal and the TSI Primary Flow Meter.
A rotameter flow meter may also be used, however it is considered a secondary calibrator and should be verified for accuracy against a primary calibrator.
Some pumps require specialized calibration devices. Please consult the owners manual of your pump to verify if any special calibration devices are required. If you need help regarding calibration, please contact your Zefon sales representative.
Why can't I use a standard calibrator with the Zefon Bio-Pump®?
The type of impeller fan motors used in the Bio-Pump® are easily affected by backpressure. Backpressure is created by small orifices (even 1/4" openings), tubing and the length of tubing used. Since most standard calibrators either use 1/4" fittings or require power to move a piston, the backpressure they create on the pump is not representative of actual use and this alters the flow reading.
Zefon has designed the Bio-Pump® flow meters to simulate the exact backpressure the pump is subjected to during use with a cassette inline. Because of this unique design, this flow meter cannot be used with any other pump.
Verification of the flow indicators provided with the Bio-Pump® may be performed using a TSI 4046 Primary Flow Calibrator, which is considered a primary standard and is available with NIST certification.
Air-O-Cell® Related Questions
What is the Air-O-Cell®?
The Air-O-Cell® is a direct read total particulate air sampling device. It works using the inertal impaction principle similar to other spore trap devices. It is designed for the rapid collection and analysis of airborne particulate including bioaerosols. The particulate includes fibers (e.g. asbestos, fiberglass, cellulose, clothing fibers) opaque particles (e.g. fly ash, combustion particles, copy toner, oil droplets, paint), and bioaerosols (e.g. mold spores, pollen, insect parts, skin cell fragments).
When would I use the Air-O-Cell®?
Whenever there is an indication that an airborne particulate problem might exist. the Air-O-Cell® is suitable for use in a variety of settings. IAQ investigations, industrial use, hospitals, homes and cleanrooms.
Why would I use an Air-O-Cell®?
The Air-O-Cell® is a simple to use disposable device which gives fast results about the type and concentration of particulate in the air. It can be used during routine inspections and investigations to determine if there are abnormally high concentrations of fibers, opaque particles or bioaerosols.
What will an Air-O-Cell® tell me about a building's air quality?
The lab will send you a detailed analysis report showing the airborne aerosol concentrations for each Air-O-Cell® sample. The report will usually have several categories with associated sub categories (ex. mold spores, pollen, etc). This will give you a good snapshot of what was in the air when the sample was taken.
Why is the Air-O-Cell® superior to other devices on the market?
The Air-O-Cell® is the first cassette styled sampling device of its kind which comes ready to use. It is also the only spore trap device to have actual theoretical calculations verified experimentally. There is no time spent preparing slides, ordering agar or decontaminating equipment. Compared to other spore traps, the Air-O-Cell®'s unique adhesive gives the user a longer shelf life, higher tack, more consistent surface, better optical clarity, permanent archive capability and no sample loss during staining. In addition, the Air-O-Cell® has a superior bioaerosol collection efficiency and quantifies fibers and opaque particles. The Air-O-Cell® is economical, works with standard sampling pumps and requires no large investments. The compact design allows use in tight or confined spaces and will provide results overnight. This compares to traditional sampling methods which can take 5 days to culture.
What is the difference between an Air-O-Cell® and Anderson or A6 Impactor sample?
The Andersen/A6 Impactor collects samples of particles to be cultured and will only report on what was viable (living) when the sample was taken. The Air-O-Cell® collects and provides results on both viable and non viable particles because the analysis method is direct microscopy and does not require the particles to be alive
Do you know of anyone who offers training classes in the identification of pollen and spores? Several courses are taught throughout the year by the McCrone Research Institute. You can contact them directly at:
McCrone Research Institute 2820 South Michigan Avenue Chicago, IL 60616-3292 Tel: 312-842-7100 Fax 312-842-1078 www.mcri.org
What is the purpose of the expiration date on the Air-O-Cell® Cassette?
The Air-O-Cell® cassette has an expiration date because the adhesive on the slide will lose tackiness. Thus, using the product after the expiration date will result in sample loss.
How much time do I have to use the Air-O-Cell® before it expires?
The Air-O-Cell® has a shelf life of 1 year from date of manufacture. Zefon strives to provide them with at least a 10 month shelf life, however there is no guarantee that you will have at least 10 months.
Is there an easy way to open an Air-O-Cell® cassette?
Yes. Do not try to remove the label around the cassette. Simply cut the label with a fingernail, screwdriver, knife or cassette opening device. Then slowly and carefully open the housing. Be sure you open it so the slide is resting in place and will not fall out when opened.
Is there any way to prevent the glass slide from cracking when removing it from an Air-O-Cell®?
The best method of removing the slide is to take the end of the slide with no adhesive holding it and tilt the slide up. Once the slide is tilted up, it may be pulled out easily.
Is there information available which recommends a sampling flow rate, sampling time or has general usage information?
Any pump capable of 15 LPM of flow. Zefon recommends using the Zefon Bio-Pump Plus. This pump is portable, pulls the required 15 LPM and has a built-in timer. Alternatively Zefon can supply you with a suitable linear, rotary vane or diaphragm pump as well which are lower in cost, but require AC power to operate.
I have noticed some variations in sampling results when using accessory devices with the Air-O-Cell® in specific situations, such as behind a wall. Why is this happening?
When using any type of attachment or accessory device, please consult with the manufacturer of that device regarding how collection and efficiency is effected.