User Manual

INSTALLATION 3
31
OPTIWAVE 7400-24 C
www.krohne.com12/2015 - 4003518001 - MA OPTIWAVE7400-24-R01-en
Equipment needed:
• Device
• Gasket for G 1½ connection (not supplied)
• Thread seal tape (PTFE) for 1½ NPT connection (not supplied)
• 50 mm / 2¨ wrench (not supplied)
• Make sure the tank connection is level.
• ISO 228-1 (G) connection:
ISO 228-1 (G) connection:ISO 228-1 (G) connection:
ISO 228-1 (G) connection: Make sure that you use the applicable gasket for the connection
dimensions and the process.
• ISO 228-1 (G) connection:
ISO 228-1 (G) connection:ISO 228-1 (G) connection:
ISO 228-1 (G) connection: Align the gasket correctly.
• NPT connection:
NPT connection:NPT connection:
NPT connection: Wind the thread seal tape around the process connection in agreement with
good engineering practice.
• Lower the antenna carefully into the tank.
• Turn the threaded connection on the antenna to attach the device to the process connection.
• Make sure that you point the device in the correct direction. Refer to "Point the device in the
correct direction" in this section.
• Tighten the connection to the correct torque (not more than 40 Nm).
3.7.5 Standpipes (stilling wells and bypass chambers)
Use a standpipe if:
• There is highly conductive foam in the tank.
• The liquid is very turbulent or agitated.
• There are too many other objects in the tank.
• The device is measuring a liquid (petro-chemicals) in a tank with a floating roof.
• The device is installed in a horizontal cylindrical tank (refer to the end of this section)
Requirements for threaded connections
Figure 3-11: Threaded connection
WARNING!
Do not tighten the connection to a torque more than 40 Nm. If the connection is too tight, this will
damage the thread.
To prevent damage to the antenna, make sure that the minimum diameter of the hole for a
1
½ NPT thread connection is not less than 43.4 mm / 1.71 ¨ .