KSR KUEBLER S12..., S14..., S18... Installation And Operating Instructions Manual

Installation and

Operating Instructions

Please retain for future usage

120873 / Rev. 01 – 07.05.2015

Float Switches

S12... / S14... / S18...

INTRODUCTION

KSR Kuebler float switches are primarily used for remote point measurement of liquid levels.
They operate by using the field of a magnet inside the float (1) to actuate reed switches inside the
device rod (2). The overall length, switch positions, and number of floats are customer specified at
the time of order. Float switches are SPDT and can be configured for different functions at the
time of installation.

For your convenience please enter:

Model #

Serial #

KSR Kuebler float switches have approvals for Explosion Proof Class 1, Division 1, Group B
depending on the ordered configuration. All materials which come into contact with the liquid
must be corrosion resistant and are customer specified. The liquid to be monitored must not be
heavily contaminated and must not have a tendency to crystallize or solidify.



KSR Kuebler float switches must be installed within 30 degrees of vertical to function
correctly. They must not be installed within 3 feet of strong electromagnetic fields.



When installing a float switch in a vessel connection smaller than the diameter of the

float requiring removal of the float(s), mark the top of the float(s) and the position of

the retaining collar(s). Be sure to replace the float(s) in the same orientation.
Reposition and securely tighten the retaining collar(s).

INSTALLATION NOTES!

(TOP SWITCH)

010-0102-XXX REV A

010-0101-XXX REV A



All wiring and hardware must be in accordance with applicable standards and

regulations. Inductive loads must have a RC network (AC circuits) or recovery diode

(DC circuits) and capacitive loads must have a series resistor to prevent early failure of

the switch contacts. KSR Kuebler float switches are designed for pilot service or
connection to a PLC. They should not be used to directly switch heavy loads as contact
damage resulting in failure can occur.



Install a pour-seal (conduit seal) fitting within 18 inches of the housing to prevent water
from entering the housing and for compliance with the National Electrical Code.

INSTALLATION

Install KSR float switches according to their type (flange or thread) using the correct gasket or

compound for sealing. Make sure the gasket is installed correctly and tighten all fasteners to the
correct torque. Replace the float(s) and retaining collar(s) in the correct orientation if previously
removed.

Wire sizing must be determined by the run length with a maximum size of 14 AWG. A ground

wire must be provided and connected to the ground block inside the housing.

1 to 4 switch PCB 5 and 6 switch PCB

The symbols screened on the terminal block board show the connections to the terminal blocks
(Figure 1). Note that the upper switch in the device rod (nearest the flange) is numbered switch 1
and labeled “top switch” on the pc board. All other switches count consecutively downward.