Dwyer CFS2 User Manual

Bulletin L-CFS2

Series CFS2 Cable Float Switch

Specifications - Installation and Operating Instructions

The Series CFS2 Cable Float Switch is a mechanically actuated floating switch

intended to activate electrical components, usually pumps, to start and stop
automatically. The CFS2 is perfect for simple level control of liquids for filling or
draining reservoirs and tanks. Float switches such as the CFS2 are the most
universally used for pump automation due to their high reliability, economical
pricing, and easy installation. Counterweights and cable hangers are available to
suit a variety of mounting applications. Optional cables available include those with
UL/CSA approval, higher chemical compatibility, high temperature durability, oil
resistance, and drinking water suitability. Contact factory for piggyback plug option,
gold contact switch option and cable length options ranging from 10 to 70 ft (3.04
to 21.34 m).

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SPECIFICATIONS
Service: Compatible liquids.
Wetted Materials:

Housing: Polypropylene;
Cable: CFS2-XXPXX-XX: PVC;

CFS2-XXNXX-XX: Neoprene;
CFS2-XXSXX-XX: 3x16 AWG SJOW;
CFS2-XXTXX-XX: Rubber compound EM7 quality ;
CFS2-XXWXX-XX: EPDM ethylene propylene.

Temperature Limits: 32 to 122°F (0 to 50°C).
Pressure Limits: 14.5 psi (1 bar).
Enclosure Rating: IP68.
Switch Type:

CFS2-DXXXX-XX: SPDT;
CFS2-CXXXX-XX: SPST;
CFS2-OXXXX-XX: SPST.

Electrical Rating:

CFS2-XXAXX-XX

10 (4) A @ 250 VAC;

CFS2-XXBXX-XX

10 (8)A @ 250 VAC;

CFS2-XXCXX-XX

10 (8)A @ 250 VAC;
10 (6)A @ 400 VAC;

CFS2-XXDXX-XX

1 HP @ 125 VAC 16 FLA;
2 HP @ 250 VAC 12 FLA;

CFS2-XXEXX-XX

0.05 A @ 250 VAC.

Shipping Weight:

Housing: 5.43 oz (154 g);
Cable: 0.77 oz (21.27 g) per foot.

Agency Approvals: CFS2-XGDSX-XX: UL and CSA approved, all others CE.

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DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]

INSTALLATION INSTRUCTIONS

The basic operating principle of the CFS2 is very simple. As fluid level rises the float
will also rise, resulting in a tilt of the micro-switch located inside the housing. This tilt
will generate a signal that can be used to actuate a motor or signal an indicator alarm.
To ensure the proper function of the CFS2, it is necessary to secure the electric cable
inside the tank or well as illustrated in Figures 1 and 2. The length of the cable
measured between the fixture point and the body of the CFS2 determines the total
extension of the float and also the resulting distance between the pump stopping and
starting level. It is essential to ensure that there are no obstructions in the CFS2
operational area before operation. During operation, adjustments to the CFS2 cable
must not be made under any circumstances, due to the fact that any unwanted
cable connections made while the CFS2 is immersed in water can lead to electric
shock. There are two installation options for this cable float switch. One method is to
fix the cable of the CFS2 to the reservoir or container with the use of a small clamp,
another technique would be to attach the accessory A-457 counterweight to the cable
of the float switch a desired distance between the highest and lowest level desired.
Note: With the use of the counterweight, the length of cable between the float and
fixed point (starting and stopping indication) can be freely adjusted.

Figure 1-Empyting

ELECTRICAL CONNECTIONS

The Series CFS2 features a variety of different cable options. One of these options
includes the selection between SPST and SPDT. SPST, single pole single throw,
allows a single operating function with the choice of operation on increasing level
(NC/filling) or operation on decreasing level (NO/emptying), depending on the model
selection. SPDT, single pole double throw allows for operation of both increasing and
decreasing level, depending on the connections made between the terminals of the
micro-switch and the cable. SPDT, which is a four-conductor cable (ground option) or
a three-conductor cable (without ground option), has one lead that is common, one
that is normally open (NO), and the other that is normally closed (NC), for the proper
connections of these conductors please refer to the wiring diagrams in Figures 3 to

12.

NOTICE

When making the connections described above, ensure that the

maximum motor power does not exceed the values indicated on
the level switch. The power supply cable is an important part of the CFS2. Should the
cable appear to be damaged, discontinue use immediately and proceed to replace the
unit. The yellow/green wire found on some units is the ground wire and must be
connected to a suitable ground terminal with the dimension greater than 1 mm

2.

The

terminal used must also be protected against accidental break.

Figure 2-Filling