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: +1 608 838 8786 • 800 225 9787 • Fax: +1 608 838 6433 • 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-float /reed-switch technology (the sensor must be suspended vertically so the float can rise freely with the level of a liquid).
When the float 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 |
EYS |
404-4 Controller 
Cable
Connection
S404 Sensor
Figure 1: Installation in STP Sumps
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 float can rise freely with the level of any liquid.
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Dispenser |
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404-4 |
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Junction Box |
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EYS |
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Controller |
Dispenser |
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Base |
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Cable Connection |
Dispenser |
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Sump |
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S404 sensor |
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EYS |
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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 STP or dispenser. Test the sensor for proper operation immediately after installation, and at least once annually.
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