Teflon body refractometer PR‑23‑M/MS is designed for use in chemically aggressive solutions and ultra-pure fine chemical processes.
PR‑23‑M is an all-purpose model, PR‑23‑MS is designed especially for the semiconductor industry. The sensor has a built-in flow cell designed to keep all metal and other easily corroding parts from coming into contact with the process liquid. All the wetted parts are made of non-metallic materials, either PTFE (Teflon®) or PVDF (Kynar®), so the PR‑23‑M/MS sensor withstands corrosion very well.
The previous figure shows the structure of the sensor. The flow cell (3) and the sapphire plate (1) are fixed to the stainless steel sensor with 4 screws. The flow cell (3) is sealed by a Kalrez O‑ring (2). The flow cell prevents any leakage reaching the metal parts, because there is a circular leakage chamber behind the O‑ring (2). The chamber connects to a checkport, which has a 1/8 in female thread connection.