11. Safe-Drive
The Safe‑Driv
e system is used for safe insertion and removal of a refractometer sensor while
the process line is under full process flow and pressure. The Safe‑Drive system is typically
used in a continuous process with infrequent shutdowns and large pipe size, diameter
50 mm (2 in) or above, for example in wood pulp industry.
11.1 Safe‑Driv
e system description
The Safe‑Driv
e system consists of a Safe‑Drive isolation valve welded to the process pipe, a
PR‑23‑SD refractometer sensor and a Safe‑Drive retractor used for sensor insertion and
removal. The two-part retractor can be kept separately in clean storage and all the installed
PR‑23‑SD sensors can be inserted and removed with one the and same tool.
Figure 92 Safe‑Driv
e system: isolation valve, PR‑23‑SD sensor, retractor
11.2 PR‑23‑SD specifica
tions
Table 54 PR‑23‑SD specifica
tions
Feature Specification
Refractive index range Full range n
D
1.
3200 … 1.5300, sapphire prism
Accuracy Refractive index n
D
±0
.0002 (corresponds typically to
±0.1 % by weight)
Repeatability and stability correspond to accuracy
Speed of response 1 s undamped, damping time selectable up to 5 min
Calibration With Cargille c
ertified refractive index liquids over full
range of n
D
1.3200 … 1.5300
CORE‑Optics No mechanical adjustments
PR-23 Series User Guide
IM-EN-PR23-E
170
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