Franklin Fueling Systems S404 Liquid Sensor User Manual

S404 Liquid Sensor

Universal Liquid Sensor

Installation Instructions

CAUTION

SENSITIVE INSTRUMENT

When installing this sensor, carefully
lower it into position and DO NOT DROP

it into the sump or tank

Franklin Fueling Systems • 3760 Marsh Rd. • Madison, WI 53718 USA

Tel: [phone] • 800 225 9787 • Fax: [phone] • www.franklinfueling.com

Overview

The S404 Liquid sensor is a component of the DC404
Dispensing Cutoff System, and is used to detect the
presence of a liquid in the normally dry Class 1, Division 1,
Group D Hazardous Areas. The sensor is supplied with a
QuickOn connector and 25 feet of cable. The S404 liquid
sensor uses magnetic-oat /reed-switch technology (the
sensor must be suspended vertically so the oat can rise
freely with the level of a liquid).

When the oat rises more than 1/2 of an inch, the
magnetically sensitive reed switch will open. The open
circuit is then recognized by the 404-4 controller which
shuts down power to the STP or dispenser.

Materials Required

Wire cutters to trim the senor wires in the Quickon
Connector.

ELECTRICAL DANGER Avoid electrical shock
hazards: ensure all power going to the ATG
console is turned off, tagged, and locked-out at
the power panel before doing any maintenance
or installation work at the ATG console.

Installation Sequence

1. Shut off power to the dispenser or STP.

2. Install the 404-4 controller in accordance with it’s
installation instructions.

STP Electrical
Junction Box

STP Sump

404-4 Controller

EYS

3. Using the supplied QuickOn connector connect the
404-4 to the S404 Liquid Sensor.

a. Insert the S404 cable through one end of the

connector.

b. Pull the white wire from the S404 into the

white slot on the connector.

c. Pull the black wire from the S404 into the

black slot on the connector.

d. Trim the wire back to the body of the

connector.

e. Repeat this process with the cable from the

404-4.

Assemble the connector.

4.

Test the sensor (verify that the system shuts down
power) Refer to Testing the S404 on the next page.

5. Lower the sensor to the bottom of the STP sump,
dispenser pan or tank interstitial, ensuring that the
sensor remains vertical so that the oat can rise
freely with the level of any liquid.

Dispenser

404-4

Controller

Cable Connection

S404 sensor

Junction Box

EYS

Dispenser
Base

Dispenser
Sump

EYS

Cable
Connection

Figure 2: Installation in Sumps / Dispenser Pans

Testing the S404

Testing this device is a matter of inverting the sensor 180
degrees with the bottom up, to trigger the shutdown of the

S404 Sensor

Figure 1: Installation in STP Sumps

2

STP or dispenser. Test the sensor for proper operation
immediately after installation, and at least once annually.