Some methods (e.g., ASTM 8174 and EPA 1020) state that the method itself is not applicable to wastes that form a surface layer. What types of waste does this statement apply to?
Given that ASTM D8174-18 covers the procedure for the flash point, in the range of –20 to 70°C, of liquid wastes, using a small scale closed cup tester, therefore capable of cooling to temperatures below -20°C, the instrument is compliant.
This test method is not applicable to liquid wastes that form a surface film, see Test Method D8175 for the determination of the flash point of wastes using the Pensky-Martens closed-cup tester.
This test method covers the procedure for a flash point test, in the range of 20 to 70°C, of liquid wastes using a manual or automatic Pensky-Martens closed-cup tester.
The difference between Pensky-Martens and small scale is: PM, about 80 ml of sample + stirring (https://www.stanhope-seta.co.uk/wp-content/uploads/35000-0_PM-93_Flashpoint.pdf).
- “Must” for PM application field, environment +5°C/+400°C.
It is not “built” to go below ambient temperature +5. - Since the stirrer is included, the “obstacle” of surface tension is inevitably reduced, however, working on approximately 80 ml of product. If we work “on a small scale” (2 ml), the influence of surface tension is insignificant.
A surface layer forms when I have a mixture of 95% water and 5% hydrocarbons (e.g. solvents).
The manual and training do not describe sampling methods.
For sampling, storage and use, always refer to the relevant test methods and standards.
How long does the ramp mode test take?
In general, how much time should we allow (including analysis, cooling, cleaning, etc.) for the instrument to be ready for the next analysis, whether in ramp mode or flash/no-flash mode?
Ramp mode testing takes less than 8 minutes (including analysis, cooling, cleaning, etc.)
In Flash/No Flash mode, the instrument takes 2 minutes.
It’s important to note that this mode is used only when you have an idea of the flash point.
If the products are unknown, it’s always best to use Ramp mode for safety.
In our laboratories, we process water-based waste (mostly with a water content well above 90%); what is the recommended analysis mode?
If we work in Ramp, what range can we cover? Does water vapor affect the analysis in any way?
The only problem with such high water contents is that flash point results, e.g., 92°C, will never be obtained because the first vapors develop at 65°C, and as the temperature rises, the water begins to “boil.”
Our staff is available to assist you with specific cases.
Can both the Setaflash Series 3 and Series 8 be used safely without a hood?
Absolutely yes.
Vapors will certainly develop, but starting from two ml of product and as soon as a flash is detected, the machine stops heating and cools.
Can the Setaflash models handle an analytical volume of approximately 100 samples per week with annual maintenance?
The automatic machine certainly can.
Routine service/maintenance is always every 12 months.
Do both models have rapid cooling or just the Setaflash 8?
The Peltier system of the Series 8, certainly.
The semi-automatic version 3 requires one person to monitor the process for about 8 hours (about 100 samples per week).
Does the ramp mode have a maximum range of 30 degrees, or can it be higher?
Yes, you can customize a method or create a new one.
However, 30°C is a sufficient temperature.
Does the cup, where the aliquot is inserted, need to be cleaned with water after each use, or is a cloth sufficient?
With disposable aluminum cups, no cleaning is necessary to preserve the cup.
What safety measures are required for the instrument: is a hood, sink, fire extinguishers, etc. necessary?
Nothing is required. We work with 2 ml of product.
In ramp mode, over the course of an 8-hour work shift, can 25-30 analyses be performed per day?
Yes