SOR Vertical Displacer Top Mounted Series Level Switch - Manual (Page 5)

Form 425 (08.12) ©2012 SOR Inc. 5/16
Switch and Switch Chamber Installation
 Verify that obstructions are not present in the application which would prevent free
float or diaplacer movement throughout the entire range of motion.
 Assure that mounting provides vertical alignment of the switch. For proper operation,
the unit must be mounted with the electrical housing and enclosing tube centerline
within 3º of vertical. The conduit connection centerline must be within 3º of horizontal.
 Controls operating in liquids which tend to leave deposits in the piping should
incorporate tee or cross type fitting to allow periodic cleaning of the process piping.
A drain or blow-down valve will assist in cleaning the control chamber and piping.
Insulation of the control chamber is acceptable, but temperature extensions,
fi nned extensions and switch housing and cover must not be insulated.
Not following these installation instructions, including pipe and valve
diameter and pipe lengths can affect operation of the switch, including
differential. See Single Switch Chamber Installation
and Multiple
Switch Chamber Installation .
External Chamber Installation
Multiple
Switch
Chambers
 Pipe support hangers or stands should be used where necessary.
 All isolation valves must be fully open during service, as restricted valves may
cause erroneous level switching.
Single
Switch
Chamber
In addition to the Single Switch installation instructions, multiple
chamber installations have the following requirements:
 Headers connecting multiple chambers to the process connection
must be larger than the chamber process connection diameter
to allow adequate liquid flow to all chambers. Multiple chamber
diameters are listed below:
- two chambers should be 1.5 times larger
- three or four chamber installations should be 2 times larger
- five or more chamber installations should be at least 2.5 times larger.
 Valves, tees, elbows and other pipe fittings in a header must be the
same diameter as the recommended header diameter.
 External chamber piping should be short, straight and unrestricted.
 Pipe must be of a diameter equal to or greater than the process
connection diameter.
 Valves and other equipment between the chamber and process
must be of the same diameter or larger than the process connection
diameter to allow adequate liquid flow into the chamber.