Ensure that the refractometer is not a source of contamination to product due to damaged or worn product contact surfaces. Such surfaces may not stay clean in processing and so do not fulfill 3‑A requirements. Vaisala offers 3‑A Standard Accepted repair and maintenance package, performed by a 3‑A authorized service center. In the repair process all wetted parts, prism, gaskets and dryer are replaced and the sensor is calibrated, all according to 3‑A Sanitary standards.
| If a sensor is repaired by using old wetted metal parts (replacing only prism and gaskets), the repair may result in a non-sanitary condition of the surfaces. |