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Why is salt contamination measurement important?
The presence of soluble salts has been shown to have a significant negative effect on coating performance and leads to premature coating failure. Salts remaining beneath a protective coating create an osmotic force that draws water from the atmosphere through the paint layer. The pressure created by this water underneath the coating overcomes the adhesive bond between the coating and substrate, resulting in corrosion, osmotic blistering, and eventual coating failure. It is therefore critical to ensure that a substrate is free from soluble salt contamination before painting.
What is measured with the PosiTector SST?
Includes a certified and traceable conductivity probe specifically designed for measuring soluble salts in accordance with ISO 8502-6,9—the Bresle Method (Salts Test). Included with each probe is a Long Form Certificate of Calibration. The following parameters are measured by the PosiTector SST:
- Conductivity (µS/cm)
- Sampling Temperature (C° or F°) normalized to 25°C
- Test duration
Using the measured conductivity value and the sample test volume (set within the gage menu), the surface density of the salts (mg/m2 or µg/cm2) is automatically calculated in accordance with ISO 8502-9, saving the gage operator time and eliminating the chance of a calculation error.
What are some typical applications?
The PosiTector SST Soluble Salt Tester is ideal for:
(a) Testing substrates for the presence of soluble salts in accordance with ISO 8502-6,9 (the Bresle Method)
(b) Testing blast media in accordance with ASTM 4940 and ISO 11127-6 (determination of water-soluble contaminates in abrasives by conductivity measurement)
(c) Testing the conductivity of water within the range of 0-500 µS/cm
The PosiTector SST conductivity probe is specifically designed for testing soluble salts in accordance with ISO 8502-6,9 and has a number of features not found in conventional conductivity meters including . . .
- An onscreen user interface to walk users through the Bresle test method, simplifying the task
- Tracking and reporting of test duration (the total time of contact between the solvent and substrate) as required by ISO 8502-6
- Automatic calculation of surface density with adjustments for different patch volumes – works with ANY Bresle-type patch
- Free software for viewing and reporting data
- Long form certificate of calibration traceable to NIST included at no extra charge. A certificate also comes with the included conductivity standard (calibration solution).
- Automatic 25°C temperature normalization
- Sample temperature recording as required by ISO 8502-9
- Purpose-built, 1 ml test cell is optimized for the range, resolution and test volume of the Bresle Method
- Rugged, stainless steel electrodes – ideal for industrial environments
- Two year warranty
How often should the PosiTector probe be recalibrated?
PosiTector probes include a Certificate of Calibration showing traceability to NIST or PTB included (Long Form) with each probe—with no expiry or end date. They have no shelf life, therefore the length of time in the field is not a good indicator for recalibration intervals. Many organizations with quality programs and recertification programs require annual recalibrations, and this is a good starting point for most users. DeFelsko recommends that customers establish calibration intervals based upon their own experience and work environment. Based on our product knowledge, data and customer feedback, a one year calibration interval from the date the instrument was placed in service is a good starting point.