TECHNICAL BULLETIN
TB0505-01
May 09, 2005
page 1 of 2
Troubleshooting Tips for the LS300 Line Leak Detection System
The Franklin Fueling System LS300 Line Leak Detection System is a precision electronic line leak detection system designed for
installation in petroleum piping systems. This document should be used as a quick reference troubleshooting guide when problems
or issues occur during the installation or operation of the LS300. For complete installation and operation information, please consult
the LS300 Auto-Learn User’s Guide.
The following sections will focus on the most common problems seen during the Learning process and in Detection mode. For a
complete list of possible conditions, please refer to the LS300 Auto-Learn User’s Guide.
Learn Mode Troubleshooting
Condition Definition Potential Causes Proposed Action
Transducer Not
Seen
The LS300 cannot detect the
signal coming from the
transducer
• Transducer is wired
incorrectly
• Wiring or connections to the
transducer are loose or
broken
• Transducer is defective
See the LS300 Auto-Learn User’s Guide’s
Transducer Troubleshooting section for specific
troubleshooting information.
Insufficient Pressure Pump pressure did not exceed
17.5 psi upon pump start-up.
• Line pressure was not bled to
zero before calibration
• Power to STP is off
• STP is shutdown due to a
fault or alarm condition
• Transducer problem
• Broken pipe or valve
• Confirm line pressure was bled to zero prior to
attempting the Learn process.
• Confirm power is on to STP and pump controller
is free of alarms.
• Possible transducer problem. Seethe LS300
Auto-Learn User’s Guide’s Transducer
Troubleshooting section for specific
troubleshooting information.
• Check sump areas for signs of leakage.
No Pressure Loss
Detected
Pressure decay was not
detected after pump shut-off.
• Leak generator not installed
or needle valve not opened
• Leak generator clogged
• Transducer problem
• Confirm that the leak generator is installed and
the needle valve is opened completely.
• Observe the leak generator during the Learning
process. Verify that the fuel flow through the
orifice is a steady stream from pump OFF to
zero line pressure. If the stream is not steady, or
line pressure does not drop to zero, replace the
Leak Generating Device, or call Tech Support at
800-984-6266.
• Possible transducer problem. See the LS300
Auto-Learn User’s Guide Transducer
Troubleshooting section for specific
troubleshooting information.
Auto-Learn
Complete
• Piping Modulus is
out of range for
annual (0.1 gph)
test.
• Piping Modulus is
out of range for
monthly (0.2 gph
and annual
(0.1 gph) tests.
During the Learning sequence,
pressure decay was too slow
for the system to accurately
detect a .1 gph and, if
indicated, a .2 gph leak.
• Air is trapped in the pipeline
causing slow pressure decay
• Leak generator is partially
clogged, or needle valve is
not opened completely
• Pipeline exceeds the
maximum pipe length
dimensions for precision line
testing
• Purge line completely, starting at the dispenser
farthest from the pump and working your way
toward the pump. Also open Needle valve while
pump is running, to remove air from that area.
Close the Needle valve and shut off the pump.
• Confirm that the Needle valve is opened
completely, and the Leak generator emits a
constant stream of product. Verify that the leak
generator tube is free of air.
• Check the bleed orifice on the Leak generator,
and look for signs of visible damage. Replace
Leak generator if necessary, do not attempt to
repair.
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