Safe-Drive; System Description - Vaisala K-PATENTS PR-23 Series Instruction Manual

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11 Safe-Drive™

11 Safe-Drive™
The Safe-Drive™ system is used for safe insertion and removal of a refractometer sen-
sor 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") or above, e.g. in wood pulp industry.

11.1 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 installed PR-23-SD sensors can be inserted and removed with one and same
tool.
Figure 11.1 The Safe-Drive™ system:
Isolation valve, PR-23-SD sensor, Retractor