Safe-Drive; Safe-Drive System Description; Pr-23-Sd Specifications; Figure 92 Safe-Drive System: Isolation Valve, Pr-23-Sd Sensor, Retractor - Vaisala PR-23 Series User Manual

PR-23 Series User Guide

11. Safe-Drive

The Safe‑Drive 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‑Drive system description
The Safe‑Drive 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‑Drive system: isolation valve, PR‑23‑SD sensor, retractor
11.2 PR‑23‑SD specifications
Table 54 PR‑23‑SD specifications
Feature
Refractive index range
Accuracy
Speed of response
Calibration
CORE‑Optics
170
Specification
Full range n 1.3200 ... 1.5300, sapphire prism
D
Refractive index n ±0.0002 (corresponds typically to
D
±0.1 % by weight)
Repeatability and stability correspond to accuracy
1 s undamped, damping time selectable up to 5 min
With Cargille certified refractive index liquids over full
range of n 1.3200 ... 1.5300
D
No mechanical adjustments
IM-EN-PR23-E