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Installation
Installation of Level Sensors
NOTE: Install level sensors in stationary tanks. The
sensors are not designed to monitor mobile tanks.
1. Apply thread sealant to the threads of a 2 npt bung
adapter to seal the tank.
2. Install level sensors away from inlet ports or pumps
to minimize inaccurate readings.
3. Ensure that the sensor body is free hanging from
the bung adapter housing.
NOTE: Level sensors are for vertical mounting only.
4. Set level sensor height by loosening the cord grip
on the bung adapter housing and adjust the length
of the suspended wire to set the desired activation
height.
NOTE: For guidance on calculation of installation height
of overfill devices, refer to Petroleum Equipment
Institute (PEI) RP600 Recommended Practices for
Overfill Prevention for Shop-Fabricated Above Ground
Tanks, Appendix A (www.pei.org).
a. The activation height is indicated on the splash
guard of the sensor.
b. High level sensors monitor the high tank fluid
level to prevent overfill.
NOTE: The level sensor height should be set to
activate following all local codes and regulations.
c. Low level sensors monitor the low tank fluid
level to prevent pump runaway conditions.
NOTE: The level sensor height should be set at
least 2 in. - 3 in. above the pump inlet.
d. Tighten the cord grip on the cable to finger
tight, plus one-half of a turn.
3A7279B
NOTE: Failure to properly tighten the cord grip may
cause the level sensor to move from the fixed
position.
5. Connect the level sensor wires following the
instructions in Fluid Defender manual, see Related
Manuals, page 1.
NOTE: Attach all accessory wires to the Fluid
Defender control box following all local codes and
regulations.
Reference the Technical Specifications, page 12,
for information on maximum wire runs and shielded
cable requirements.
All accessory circuits are low voltage (less than 48
VDC).
Installation
7
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