Monthly Archives: April 2013

Filter Cold Test Chamber


A top and side view of the chamber.

After repeated requests from aircraft manufacturing firms, airplane engineers and aerospace filter manufacturers, IFTS has invested and developed a highly accurate cryogenic filter test chamber.

The complete test system and associated equipment, is housed in a fully insulated cold chamber which allows in depth filter tests at temperatures as low as -40°C, flow rates up to 50 gpm (200 L/min), and at differential pressures up to 90 psid (~6 bar). The flexibility of the system design allows us to perform various custom test configurations. This might include the filter and all its associated components tested within the cold chamber at a constant low temperature, or another popular method is where all equipment is held outside the chamber at ambient temperatures and only the test filter is inside at the low test temperature.

As an example; a recent test program consisted of monitoring the clogging and physical behavior of kerosene filters in the presence of trace water in kerosene at -45°C and a flow rate of 50 L/min. Water was injected upstream the circulation pump to create an emulsified test fluid and ∆P was continuously recorded until the end of test value was reached. The results provided an in depth and unique view of these challenging conditions.


Validation Criteria of an APC Calibration Suspension Preparation Loop

Globally there is a need for highly accurate particle counting. This is especially true in the filtration and separation industry. An ISO expert group took on the responsibility to draft the new specification for the improved calibration fluid, SRM2806b, which will be used to calibrate optical particle counters worldwide.  IFTS accepted the development challenge and used its expertise in particle counting and cleanliness control to develop a new world class fluid process and production system to produce the new calibration fluid.

 6b Secondary Calibration Fluid

SRM2806b Secondary Calibration Fluid

The initial challenge was to produce four hundred, 400mL bottles with an ISO suspension of silica powders in a standard mineral oil and to guarantee that the particle size distribution is replicated in each and every bottle.

With this new validated equipment, IFTS can now guarantee online particle stability within 1 % >4 µm(c) and 5 % >40 µm(c) and larger.

Our new equipment will allow IFTS to supply the world market with the most repeatable secondary calibration suspensions ever prepared according to ISO 11171.

NIST is currently validating all the bottles in their labs in Maryland.