Ronan X76CTM - Manual (Page 4)

1.0 INTRODUCTION
The X76CTM Continuous Electronic Tank Moni-
toring System is designed to tighten inventory con-
trol of fuels and other liquids stored in underground
and aboveground tanks. The probe, controller and
sensors form a system that measures fuel height,
fuel temperature, water height, and leakage. It will
also provide information on gross and net fuel vol-
ume, leak alarms, and time and date of the leak.
Information acquired automatically provides faster
shift changes by eliminating the need to manually
stick the tanks and generate manual reports. This
reduces human error and makes it possible to spot
losses by theft, leaks, or meter miscalibration. The
system provides a highly reliable tool for a sound
inventory management practice.
2.0 GENERAL DESCRIPTION
The X76CTM features a 2 line by 24 character
alphanumeric LCD that provides instant information
for each tank including: product volume and level,
product temperature, water level, and time and
date. The X76CTM also provides reports, alarm
warnings (utilizing the LCD display), an alarm LED,
a printer, and output relays.
The X76CTM performs in-tank leak detection test-
ing through a continuous statistical leak detection
algorithm, which eliminates the need for unnec-
essary and costly station shutdown for in-tank tests.
Once the power-up and configuration of the
X76CTM System are complete, the operation of the
controller is automatic. Check to make sure that the
paper is locked into the printer feeder. The system
is ready for user login and monitoring.
IMPORTANT: Information provided by the X76CTM
should be used as part of a conscientious inventory
control program. If loss of product is identified by
the Leak Detect Test, call for a precision tank test.
Do not excavate tanks or take other remedial action
based solely on X76CTM inventory or leak detec-
tion reports. While the X76CTM is capable of
detecting leaks as small as 0.1 gallons per hour,
the system is testing only that portion of the tank
containing product at the time of the test. Call for a
precision tank test to confirm a suspected leak.
NOTE: If an ‘overfill tank tightness test’ is to be
performed to confirm a suspected tank leak, the
95040XB Gauge Probe must be removed from the
tank. The system warranty will not cover damage to
the probe resulting from an overfill condition.
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3.0 SAFETY RULES
3.1 Intrinsic Safety
Hazardous atmospheric mixtures include all
explosive or ignitable air mixtures involving
gases or vapor at an atmospheric pressure
and with ambient temperatures between zero
and 120°F. The order of ignitable materials
generally corresponds to the National Electri-
cal Code groupings. The workable categories
and test materials used typically for each are:
Group A: Acetylene (8.7% by volume)
Group B: Hydrogen (21.0% by volume)
Group C: Ethylene (7.8% by volume)
Group D: Methane (8.2% by volume)
The ignition capability of an electrical circuit is
determined by the electrical energy available
and the manner in which such energy is
released. Energy may be released in the form
of a spark, by resistive heating effects or a
combination of the two. There are three basic
mechanisms by which electrical energy may
be released in the form of spark discharge:
discharge of a capacitive circuit, interruption of
current in an inductive circuit, and make-break
of a resistive circuit. The minimum ignition
energy for any flammable mixture is the small-
est amount of energy released as a spark and
sufficient to ignite the mixture at 0 psig.
The most easily ignited air mixture is that
mixture of flammable material in air which
requires the minimum amount of energy for
ignition. The flammable material is usually
designated in percentage by volume in air.
Normal operating conditions include maximum
supply voltage and the extreme environmental
conditions that fall within the ratings given for
the specific equipment under investigation.
Abnormal operating conditions usually refer to
any two mechanical or electrical faults occur-
ring in combination. The faults are independent
and include accidental damage to, and failure
of, components or wiring.
Intrinsically safe electrical equipment and
associated wiring are incapable of releasing
sufficient electrical or thermal energy under
normal or abnormal operating conditions to
cause ignition of a specific hazardous mixture
in its most easily ignited concentration in air.
The flammable material may be a gas or
vapor.
Underwriter’s Laboratories, Inc. approvals are
based on examination and test of samples of