Chapter 2 - Gauge Description - Garnet SeeLeveL Special 809-DM User Manual

CHAPTER 2 - GAUGE DESCRIPTION

T
he 809-DM SeeLeveL gauge consists of six sender bars, six
donut shaped floats, fiber optic interconnect cables, and a
display. Each sender bar is mounted vertically in the tank with the
float sliding up and down around it in accordance with the fluid
level. The sender bar sends the fluid level information via fiber
optic cable to the display, which displays the level in appropriate
units and operates the alarms and remote data transmitter. Up to
three more tanks can also be monitored using the Remote Inputs
on the 809-DM.
The float contains magnets which activate reed switches inside the
stainless steel sender bar to indicate the level of the fluid. The
activated switches are detected by the microprocessor at the top
of the bar. The microprocessor operates from a long life lithium
battery giving about 10 years of life. The level information is
relayed through the fiber optic cable to the display, the fiber being
used to maintain electrical isolation between the sender bar and
the display, allowing operation in flammable liquids.
The display converts the level information to volume according
to the calibration programmed into it with the 817 Truck Gauge
Programmer. The calibration can be in inches or volumetric units
such as cubic metres or barrels, and each tank can have its own
calibration. The tank level is shown on an illuminated LCD (Liquid
Crystal Display) which gives excellent visibility. The display operates
from a 10 year lithium battery, with 12 volt truck power operating
the LCD illumination, alarms, and remote communications. The
entire display is enclosed in a 6" by 6" by 4" weatherproof enclosure
which can be mounted inside or outside of the truck cab.
The 809DM system is designed for body trucks with up to 6
product tanks. It also has remote inputs to connect up to 3 other
Garnet gauge systems, which may be used for water tanks on the
same truck. The system provides remote communications via a
serial port which can be used to remotely program the amount of
product to be dispensed, as well as to be able to remotely monitor
the tank levels, alarms, and truck PTO status.
Only one tank is viewed at a time, selected by the buttons on the
front panel. However, when not dispensing, all of the tanks are
scanned to keep the alarm and remote communication information
up to date. During dispensing, only the viewed tank is monitored
to make sure that it is kept up to date as quickly as possible.
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