A2F-Filters.com

WATER FILTER

A2F offers an economic, compact, easily installed and maintain filtration system for the removal of particulates from liquid. It is available in polypropylene, bleached cotton, glass fiber, acryl, viscose and polyester and with inner support core can be polypropylene, stainless steel OR tinned steel. Long life plus high dirt holding capacity. Compatible with wide range of fluids and temperature. Range of nominal rating from 0.5 to 125 and available length 10,20,30& 40 ". Competitively price and ex-stock availability.

WATER FILTERS :

PRE FILTERS PP WOUND, PP SPUN BONDED, RBC ,

ABSOLUTE FILTERS PP PLEATED HALF DEPTH , FULL DEPTH ,

Beverages Filtration : PES Polyether sulphone Filter membrane filter

SS HOUSINGS FOR VENT FILTRATION , AND LIQUID APPLICATION

PLASITC HOUSING NON TRANSPARENT ,

POLY CARBONATE TOUGH TRANSPARENT FILTER HOUSING

MULTICARTRDIGE SS AND PLASTIC HOUSING;

BAG FILTER HOUSING AND SYSTEM;

NUTCH FILTER SYSTEM ;

PHYSICAL TESTING LAB SETUP DISCRIPTION :

Finemesh A2F-FM :

Per- and final filter for particle removal from aqueous solutions, water and other liquids, as well as gases, with an absolute retention rate.

STEAM FILTRATION WELDLESS FILTER PIPE

Product Description:

The Finemesh filter consists of a regenerrable stainless steel outer guard and endcaps.

The retention rate extends from 5mic. Tp 250mic.

Features: The Finemesh filter element offers an especially economical pre- and final filtration. Where the stainless steel mesh can be regenerated by ultrasonic bath or back flushed. This is especially important at higher particle loads. The contact points of the mesh material are welded firmly together, which guarantees a constant pore diamerer. Even under extreme operating conditions. The heavy-duty construction of the Finemesh filter is also suitable for high-viscosity liquids and can withstand a differential pressure of up to 5 bar (75 psi). In addition, the filter can be send for temperatures up to 20oc (4000F.)

A2F XF-GS

Filter for the removal of particles from gases, liquids and steam.

Product Description:

The A2F consists of a regenerable weldless filter pipe mad from sintered stainless steel. The retention rate extends from 1mic. To 25mic.

Features: The A2F retains contaminants, such as particles, abrasion of valves and sealings as well as rust. An improved steam quality ensures longer service life of the filters to be sterilized and increases the efficiency of the entire process. The A2F element offers the possibility of a particularly economic filtration, since the filter medium can be regenerated by ultrasonic bath. This is especially essential at high particle loads. The porosity level is more than 50% which ensures high particle and dirt holding as well as a good flow rate at a low differential pressure. Te heavy-duty construction of the A2F is designed to withstand a maximum differential pressure up to 5 bar (75 psid). The filter may also be used in a temperature range of - 20oc(-40f) up 210 0C 410oF).

DIFFUSION TEST

The diffusion test measure the quantity of air diffusion through the filter medium. Like in the bubble point test, the element has to be rinsed with a wetting agent. After this valve V1, V3, V4 and V6 are closed, V2AND V5 are opened. A pressure of approximately 79-80 % of the bubble point value is entered through valve V2 till it stabilizes.

The diffusing air volume is measured by an inversed water filled burette that is in a container with water. If the filter element works correctly, only a certain air volume per minute and filter is supposed to diffuse through the filter, its medium and the pore size, and will be indicated by the manufacturer. The diffusion test states the membranes' "average" pore size. Diffusion valves that are too high or too low may be due to a damaged filter or leakage in the filter or leakage in the filtration system.

THE PRESSURE HOLD TEST

The principle of the pressure hold test is the same as that of the diffusion test. Apart from leakages of the filtration system can be detected. A distinction whether there is a leak or whether the membrane lost integrity is not possible. After a water - or IPA rinsing of the filter element the moisting liquid is drained through valve V4, then valves V1 AND V3 are closed.

A pressure of approximately 70-80% of the expected bubble point value is entered through valve V2 and after a short period of stabilization of about 3 minutes readjusted again. Valve V6 is kept open fusing that whole process. After a certain time the pressure is supported to drop only by a certain value in order to preview that the integrity of the filter element is still assured.

The pressure drop does not usually leave the millibar range and therefore it is necessary to have very exact pressure gauges.

The pressure drop depends on pore size, filter medium and wetting agent. Furthermore the temperature has to be kept constant during the measurement in order to get relevant results.

These three methods can be conducted manually but they require a lot of time and well qualified staff in order to avoid incorrect measurements.

The Bubble Point Test

At the beginning of the bubble point test the membrane has to be rinsed with an adequate wetting agent. For hydraulic membrane this is usually water, for hydraulic media isopropyl alcohol (IPA) or an IPA-water mixture depending on the manufacturers specifications.

After the element has been wetted sufficiently, the remaining water is drained by the drained by the drain valve (V4). The valves at the upstream (V1) and downstream side (V2) are closed. The valves V2 and V5 are opened. After that an air pressure of around 70% of the expected bubble point valve is introduced through valve V2. For each membrane the bubble point depends on the pore size.

The pressure is being risen by 0.1 bar steps until an even flow of air bubbles rises from the free end of the tube that ends in a water filled container. Then the bubble point is reached. The pressure has to be higher than the valve given by the manufacturer in order to prove that the filter element still has integrity.

The bubble point depends on various factors:

1. Temperature

2. Filter medium

3. Wetting agent

4. Pore size

In order to get reproducible results the parameters have to be the ones given by the manufacturers.

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