Sometimes a seemingly innocuous procedure can bollix up desired results. That’s why the old saw “real people don’t need to read directions” can frequently result in less than desired outcomes.
So it is with mounting Tovatech’s FlowCal 5000 liquid flow meter, a factory-certified digital liquid flow meter for use with any model HPLC pump. The accuracy and repeatability features of this precision device are maintained by proper use and regular cleaning, but are also dependent on proper mounting.
The slang phrase “you’re all wet” is generally not taken as a compliment – signifying instead that “you are wrong.” Wetness can also be wrongness when too much moisture is contained in products such as plastics, fabrics and wood chips. Laws define the maximum moisture content in applications including food processing and pharmaceutical manufacturing. Correct moisture content positively impacts processing results and overall product quality across a wide range of industries.
Fast, accurate calibration of flow rates used in HPLC flow systems can be compromised if the flow meter is not maintained. While GLP (good laboratory practices) call for annual flow meter recalibration by the manufacturer, improper use of these precision instruments can soon render them inaccurate.
A serious error is introducing in immediate succession two immiscible liquids into the flow meter. Either allow the first liquid to completely evaporate or introduce a third solvent in which the other two are miscible.
Dirty sensing tubes in FlowCal 5000 HPLC flow meters may cause bubbles to become entrapped. This can create falsely high readings. If bubbles are observed, a quick fix is to turn the unit off, wait approximately 2 seconds to allow it to drain, then switch it on. Contaminated tubes will also result in an “Error 4” reading denoting either the flow meter is not draining or the sensing tube is contaminated.
Another good practice is flushing the flow meter with methanol if it is not to be used for a week or more. This prevents algae growth in the tube.
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To get the most from your investment in an ultrasonic cleaner you should avoid practices that degrade performance. But because mistakes occur you also need to know how to remedy situations that may arise due to improper use, or in the case of cavitation erosion postpone its onset.
A question we get here at Tovatech is how to avoid rust films on ultrasonic cleaning tanks. Elma ultrasonic cleaners have stainless steel tanks, which under normal conditions do not rust. Instead, rust films are introduced as a deposit either from ferrous products being cleaned or from tap water used in the tank. Rust stains can be avoided by regularly cleaning the tank surface using a suitable cleaning solution such as elma clean 60 or 215 to remove deposits before they have the opportunity to stain the tank surface. If stains are present, an alternative is to operate the cleaner in a heating mode with water plus the cleaning solution.
Under no circumstances should scouring media be employed in any tank cleaning operation.
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