POTTER WLS Tank Water Level Switch Owner’s Manual

POTTER WLS Tank Water Level Switch

WLS Tank Water Level Switch

Features

• NEMA 4

• Suitable for use on pressure or gravity switches

• Mounts to wood or steel tanks
  NOTE: Wood tanks require optional buttress adapter

• Product includes a 5 year warranty

Description

• The Model WLS Water Level Switch is a float operated device for supervising water level in a sprinkler supply gravity or pressure tank.
• The Model WLS has a bushing with 1 1/2” American Standard Pipe Threads for mounting in steel tanks. A 1 1/2” NPT x 2” NPT adapter bushing is available for mounting in existing 2” steel flanges. An optional bushing adapter with a buttress thread is available for mounting in wooden tanks.
• The unit is capable of detecting the level of water before a 3” (7,6cm) rise and/or a 3” (7,6cm) fall in the water level in a pressure tank, as required for NFPA 72.
• The cover is held in place with two tamper resistant screws (provided), which require a special key for removal.

Technical Specifications

Dimensions| Housing – 5.56”H x 3.50”W x 2.56”D

14,1cm H x 8,9cm W x 6,5cm. See Fig. 1

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Weight| 3.25 lb / 1.47 Kg

Enclosure

| Cover: Cast aluminum with red powder coat finish

Base: Steel zinc plated

Applications| Steel or wood tanks (With the optional wood bushing adapter, Stock No. 5180199)

Contacts

| Two sets SPDT (Form C)

One set for high / One set for low Rated – 15.00 Amps at 125/250VAC

0.50 Amp at 125VDC

0.25 Amp at 250VDC

Detection Range| Before 3” (7,6cm) Rise /Before 3” (7,6cm)

Fall

Environmental Specifications

| •          Suitable for indoor or outdoor use

•          Temperature range: 40°F to 140°F (4,5°C to 60°C)

•          NEMA 4 rated enclosure – when used with proper conduit fittings

Maximum Pressure| 175 PSI (12,1 BAR)

Cover Tamper

| Cover incorporates tamper resistant fasteners that requires a special key for removal. One key is supplied with each device

Dimensions

Installation Instructions

• A buttress thread nut and gasket are available for use with devices on installations where the inside of the tank is accessible and it is not convenient to weld a flange on the tank. The nut and gasket can also be used in a wood tank that is not sound enough to hold a thread (see Fig. 2).

• For installation in steel gravity tanks, weld a 1 1/2” NPT threaded flange (#6660225) 9” (23cm) below the required water level to receive the 1 1/2” bushing (see Fig. 3).

• For wood gravity tanks, bore a 2 3/8” (60mm) hole in the center of a stave 9” (23cm) below the required water level and screw the buttress bushing
  adapter (#5180199) in place, allowing the bushing to cut its own thread, then install the WLS into the adapter (see Fig. 4).

• For pressure tanks, weld the 1 1/2” NPT threaded flange (#6660225) into the tank at the desired water level and use both high and low signals.

• To replace an existing Potter WLS in a steel tank with a welded flange a 1 1/2” x 2” NPT bushing adapter (#5020126) is available. Thread the bushing adapter
  into the 2” welded flange securely then install the WLS into the adapter.
  NOTE: The high signal is not required for gravity tanks and the WLS can be wired so that either High or Low or both switches may be used (see Fig. 5).

WARNING
Do not lift or hold device by float or float rod as bending may occur.

Orientation and Switch Placement Fig 5 NOTE: Device must be oriented vertically with conduit entrance toward bottom of water tank.

Switch Plate Terminal Connections Clamping Plate Terminal Fig 6

WARNING
An uninsulated section of a single conductor should not be looped around the terminal and serve as two separate connections. The wire must be severed, thereby providing supervision of the connection in the event that the wire becomes dislodged from under the terminal.

Ordering Information

Potter Electric Signal Company, LLC
St. Louis, MO
Phone: 866-956-0988
www.pottersignal.com
firealarmresources.com

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