The protection cap is useful if you are measuring in bulk water e.g. wastewater. The steel protection cap reduces the risk of breaking the fragile sensor tip and hereby prolongs the expected lifetime of the sensor.
The protection cap comes in two versions; a permanent mounted and a reusable version. Both cap types can be mounted on laboratory and in-situ sensors. The diameter of the protection cap is 11 mm and holes in the cap ensure flow around the sensor tip to maintain its good measuring properties.