Vaisala offers certain PR‑43‑AP configurations
which have been certified to fulfill the sanitary requirements published by EHEDG (European
Hygienic Engineering & Design Group) organization. During this certification the hygienic
characteristics of both the refractometer and the process connection were evaluated against
the applicable requirements.
To ensure EHEDG compliant installation, follow
the mounting specifications provided on the mounting drawing supplied by Vaisala with each
PR‑43‑AP refractometer ordered with the ‑EH option.
Table 1. EHEDG certified PR-43-AP
4 in sanitary clamp
EHEDG certified sanitary gasket 4 in
4 in sanitary ferrule
For an installation that complies to EHEDG guideline 10, the distance a must be
shorter than the diameter b.