Franklin Fueling Systems Tank Sentinel (TS-1001, 2001, 504, 508 & 750) Operators Guide Rev. C - Manual (Page 94)

G Page G - 2 Tank Sentinel Operator’s Guide
DWT An abbreviation for a Double Wall Tank.
EPROM An abbreviation for: Electrically Programmed Read Only Memory computer chip.
F An abbreviation for the Fahrenheit temperature scale.
FLOAT One or two floats are installed on liquid level PROBEs. All floats are magnetized so the
float position can be determined exactly along the length of the probe. Floats are designed to
float above products or below specific products but above water Two floats are used in
petroleum and similar applications where the product is both lighter than water and does not
mix with water (is immiscible / insoluble). For these applications, a water-interface-float is
installed under the product float and is designed to float on water (in the region where the
water and product meet). The water volume is calculated and is subtracted from other various
calculations such as gross. A stainless steel float is used with special products and chemicals.
GRACE PERIOD The programmed time where normal operation will resume after an alarm is
ACKnowledged.
GROSS The product-volume within a tank and is a calculated from the LEVEL measurement of
the probe (less water-volume). Gross product volume value is not temperature compensated,
and therefore, will fluctuate with the product temperature because of thermal expansion /
contractions. Product temperature equalizes / stabilizes several hours after a delivery in
underground storage tanks (USTs). After a delivery, wait six hours before manually starting
a leak test. The gross volume value is important in situations where the product is both lighter
than and does not mix with water (is immiscible / insoluble).
HERTZ The alternating current (AC) frequency in cycles per second.
HIGH BRINE An alarm from a special TSP-HIS leak detection sensor. This sensor monitors
the brine for changes in level within the hydrostatic interstitial reservoir.
INTERSTITIAL SPACE The space between double wall tanks (air or brine-filled).
HYDROSTATIC INTERSTITIAL RESERVOIR Located above special DWTs. A brine solution
is added to the interstitial space of special double-walled tanks to a certain level in the
reservoir. The reservoir brine is monitored by the TSP-HIS BriteSensor for changes in level
(which should not occur). High or Low interstitial brine levels indicates: a water-leak into the
brine solution when ground water levels are high, or a brine-leak into the inner product
containment tank or into the environment (also see leaks and Chapter 2).
INDETERMIN An abbreviation for INDETERMINATE leak test result (the leak test ran 8 hours
but could not calculate a definite result, which could be either a pass, fail, or increase, usually
because of wave action within the tank or because of product temperature fluctuations. Also
see the chapter about leak testing.