Filter Testing Machine - Filter Testing Machine Exporter, Manufacturer, Distributor, Supplier, Trading Company, Ahmedabad, India

Testing Machine, Cleaning devices & R&D Filter

APPLICATION

The bubble point test system is used to determine the size of the biggest pore and air flow value of the new - or- cleaned reusable candle resp. flat filters.

The size of the biggest pore is the measure to judge about the filter rating and if not in conformity with the previously measured value, about damage - or- change of a filter.

The airflow value allows to determine the quality of the filter cleaning procedure and to estimate the lifetime of a reusable filter in the next filtration cycle after cleaning.

DESCRIPTION

The bubble point test system consists of the inlet air filter for oil free instrument air with quick connection

Pressure gauge for the supply pressure
Pressure regulator
Pressure gauge
Shut-off valve
Flow meter
Needle valve
Precision manometer
Shut-off valve
Pressure release valve

The system is installed in a portable case. Included in the supply is a through for immersing candle filter of upto 70 mm diameter and 700 mm length as well as some connectors and tubing for connecting the system to candle filters.

Stationary bubble point test systems can be selected with various dimensions of the tank depending upon the requirements.

The filter to be tested is immersed into the test tank containing isopropyl alcohol and completely wetted. The bubble point test system is connected to the compressed air supply and to the filter at closed shut off valves. The system pressure is adjusted to a minimum value. The needle valve of the flow-meter is slowly opened after opening the shut off valves to the flow-meter and to the precision manometer. The needle valve is opened carefully until the first air bubble is observed at the filter. The inlet pressure to the filter indicated at the precision manometers read at the same time. The pressure value is measure for these called "Bubble Point" i.e. for the filter rating respectively for a damage or change of filter.

For determining the air flow value the dry filter is connected to the bubble point test system at a system pressure adjusted to a minimum. The needle valve of the flow-meter is opened and the air flow increased, until the filter inlet pressure at the precision pressure manometer reaches the defined measuring pressure (200 Pa). The air flow value at this pressure is taken at the flowmeter. Compared to the air flow value of the unused filter, measured under identical conditions and at the same filter inlet pressure, a judgement about the filter cleaning quality and an estimation of the next filtration cycle period length is possible.

TECHNICAL SPECIFICATION

The bubble point test system is designed to determine the bubble point of filter media and filters which is a figure for characterization of the fineness of filter media and filters as an indicator for damage to a filter. It is measured usually at the filter immersed in isopropyl alcohol as a pressure and read in pascal - or- mm of water gauge.

The bubble point test system additionally determines air flow rate of the filter media and filters which is a figure for characterization of the permeability of a filter and allows, if compared with the air flow rate of the virgin filter, an estimation of the filter capacity at the next filtration cycle.