4 Place the nozzle guide plate (4) on the wash nozzle.
5 Fix the nozzle guide plate to the SDI isolation valve with 2 M5 screws (5). Fix the nozzle
guide plate to the wash nozzle with an M5 socket screw.
6 Tighten the wash nozzle nut (2) to 80 Nm. Place the protective sleeve (3) over the nut
(2). Tighten the M5 socket screw (6) to secure the protective sleeve.
7 Fold the locking plate (7) over the screws (5).
11.5 Safe sensor insertion and removal for
Safe‑Drive generation 2.1
These instructions are for Safe‑Drive generation 2.1. If you have Safe‑Drive generation 1 or
generation 2, consider upgrading to generation 2.1. Upgrade from generation 1 requires
shutdown, upgrade from generation 2 can be done at any time. See https://
www.vaisala.com/en/safe-drive-refractometer-pr-23-sd-manuals-safety-instructions-and-
safety-videos for more information on how to upgrade.
Always use the Safe‑Drive retractor for sensor insertion and removal! Safe
sensor insertion and removal can only be guaranteed when the retractor tool is used
and these instructions are carefully followed. Removing the sensor without the retractor
tool may cause a life-threatening situation if there is any pressure in the pipe. Also, the
lip seal damages easily if the retractor is not used.
WARNING!
Safe‑Drive is designed to protect user from process liquid and to safely
insert and remove the sensor. However, do not underestimate or neglect the factory
safety requirements:
• Wear long-sleeved safety clothing since the process liquid can be either hot,
corrosive or both
• Use protective gloves
• Use safety glasses and/or goggles
• Use ear protectors
• Use a hard hat or helmet
• Use face visor
• Wear hard-cap safety boots
• Before you start, locate the nearest emergency shower and eye wash
• Never operate the system alone: It is recommended for one operator to read the
instructions and guide the second operator performing the step
WARNING!
The drain valves, see Figure 104 (page 183) and Figure 107 (page 186),
should always be closed unless otherwise indicated. If the valves are left open, process
liquid will leak out through them.
WARNING!
Chapter 11 – Safe-Drive
189
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