Bacterial contamination

OELCHECK test instrument: Incubator INCU-Line®, IL 10
Dip slides: TSA with TTC and Bengal red agar, for bacteria and fungi
Sample quantity: approx. 50 ml
Unit: CFU/ml (Colony forming units/ml)
Test result: Bacteria or fungal contamination
Analysis for: Glycol-free coolants
Fuels (diesel, biodiesel, vegetable oil)
Brief description: Coolants from stationary applications without the risk of freezing often do not contain glycol and can become infested with bacteria and/or fungi in the course of their operation time.
Fuels can also be attacked by bacteria. These multiply in the boundary area between fuel and free water at the bottom of the tank.
In order to detect such infestation, test strips with applied culture medium are immersed in the medium, sealed airtight, and then incubated at 30°C. After 24 h or 48 h, the test strip is visually inspected for growth of bacteria or fungi and evaluated.
Underlying test standard: OELCHECK test method 017