Automatic water vapour permeability tester

Automatic water vapour permeability tester LYSSY L80-5000

Accurate results in minimum time

With the most up-to-date L80-5000 moisture tester, quick and reliable measuring of the water vapour permeability of packaging foils and films, complex membranes, such as those used in hygiene and for surgical products, as well as other water vapour barriers, becomes routine.

Whether dealing with films or textiles with extremely high or very low water vapour permeability, the L80-5000 gives accurate and extremely reproducible values in the minimum time.

A measuring system which has become standard

The instrument operates according to the dynamic measuring method used successfully for decades which has since become standard. The specimen fixed a self-adhesive mask is used as a barrier between a space with a saturated atmosphere and the measuring space with low reletive humidity, The extremely sensitive moisture sensor on AIO_{2 substrate is located in the upper measuring chamber.}

Depending on the humidity, the sensor changes both its resistance.

Thanks to its large, linear dynamic measuring range, a minimal hysteresis and the extremely short reaction time, this new humidity sensor is particularly suitable for this application.

An approved operating principle

The upper measuring chamber can be closed for the measuring procedure with two solenoid valves or be flushed through with dried air.

The measuring principle is amazingly simple.

• Dry the measuring chamber to a defined value and close the valves.
• Increase the humidity in the measuring chamber dependent on the water vapour permeability of the sample.
• Measure the time required for a small increase in the relative humidity (rH) as a value defined by two set limits.

-> The more permeable the filem, the shorter the measuring time.

Calibrate ... measure, measure, measure...

Firstly, the instrument is calibrated with a test standard of known water vapour permeability in defined conditions. the micro-processor calculates a factor from the resulting time intervals which allows direct evaluation of permeability in g/m² per day from the sample measurements. Calibration is automatically repeated until the results obtained level out within a pre-defined variation.

Accurate and reliable measuring results

During measuring, the sample fixed in the self-adhesive measuring mask is analysed under the same conditions as the standard. Time requirement is expressed directly in g/m² per day and recorded together with date and time on a printput.

A compack instrument for even more reliable and accurate results

The new L80-5000 is the latest member or the fifth generation of the tried and approved L80 Series which has been used successfully for decades in many labs all over the world.

All the elements of the measuring equipment and its connecting calbes, all the electronics, the printer, the alphanumerical keyboard and the easy-to-read luminescent display as well as all the electrical connections are inside a compact casing protected from external interference.

Temperature-controlled measuring

The water vapour permeability of plastics is extremely temperature- dependent. That is why the L80-5000 can be used at precisely the required measuring temperatures. For measurements below 30°C, the measuring chamber can be cooled down to the lower temperatures with a cooling thermostat which is commercially available. For faster equilibrium adjustment of hydrophilic materials, the samples to be measured can be preconditioned outside the instrument

Wide range of applications

• Water vapour permeability of films and complexes
• Blister packaging and blister materials
• Super-barriers on an SiOx substrate
• Metallized foils
• Impermeabilized fabrics
• Sugical and hygienic membranes
• PUR-coated fabrics for nursing
• Roofing felt and roofing water vapour barriers
• Stable fibre coating s and coated paper

technical Specifications

All data according to present state of development, without any obligation and under reserve of modifications.

International patents and standards

The L80 measuring principle conforms to the most important international standard.

• ASTM E 398-83
• ISO/CD 15106
• JIS K 7129 (1992)
• TAPPI T 523 os-76
• NF H 00 044 (1990)

Sccuracy and quality management

The new L80-5000 is manufactured in Swizerland in a factory certified to ISO 9001 and in accordance with EC conformity.

Your Quality Assurance

For manufactures and users alike, the L80-5000 is an indispensable tool for Quality Assurance, This instrument could perhaps become your most profitable investment in avoiding damage or as a safeguard in prodect liability cases.