The sensor itself is built just like the PR‑23‑M sensor, see Teflon body refractometer
PR‑23‑M/MS (page 146), and it is fixed to the Saundersâ body in the same way, with a
sapphire plate and a Kalrezâ O‑ring to keep all the metallic parts away from the process
liquid.
PTFE wetted parts
Sapphire plate
O-ring (Kalrez)
Prism
Flow cell adapter
(AISI 316L)
Graphite cast iron
Saunders valve body flow cell
F
L
O
W
PR-23-W Sensor
PFA/ETFE
Figure 82 PR‑23‑W Saundersâ body sensor
10.9.1
PR‑23‑W sensor model code
Table 49 PR‑23‑W sensor model code
Model Description
PR‑23 Sensor
Sensor model
‑W Aggressive medium Saundersâ body flow cell
Refractive index range limits
‑73 R.I. 1.320–1.530 n
D
sapphire prism
‑74 R.I. 1.260–1.470 n
D
sapphire prism
Sensor wetted parts material
‑2TF Teflonâ PTFE (Plytetrafluoroethylene)
Sensor/diaphragm valve body connection
2 Adapter for 2 in/DN 50 valve body
Chapter 10 – Sensor specifications
155
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