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Four channel display ideal for use in small tank farms. |
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Patented digital system measures fluid level with
1/4” accuracy in tanks up to 32 feet high. |
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Monitors up to four tanks.
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Up to six sensors spaced throughout the tank provide
product temperature.
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Self powered system allows stand alone operation with
no external power.
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Large LCD displays cycle between fluid level/volume
and individual temperatures.
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Large LCD displays cycle between fluid level/volume
and individual temperatures.
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Programmable 4-20mA analog outputs for volume and
temperature, digital data output for use with Garnet
Remote Display or Portable Remote Display.
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316 stainless steel sender bar and polyethylene float
resist corrosion, optional PVC sheath for the sender
bar is available for acid applications.
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High reliability design has no moving parts except
for the float.
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Designed for simple installation and servicing; system
features modular design, fibre optic connection
between sender bar and display (no electrician
required), no external power requirements, and
extensive diagnostic tools.
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Operation from -45 to +60 oC ambient
temperature, -45 to +85 oC product
temperature.
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One year limited warranty, competitive price.
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Maximum number of tanks:
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four
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Maximum tank height:
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32 feet (9.75 m).
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Principle of operation:
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Reed switches in sender bar are activated by magnets
in the float, and are read by a microprocessor. Signal
from the sender bar is transmitted to the display
through plastic fibre optic cable, providing
electrical isolation for hazardous environments.
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Resolution:
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1/4 inch (6 mm).
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Accuracy:
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+/- 1/8 inch (3 mm), temperature drift is zero.
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Specific gravity sensitivity:
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Float sinks one inch (25 mm) in water.
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Hysteresis:
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1/16 inch (1.5 mm) (Difference between reading with
float rising and reading with float falling.
Eliminates display flicker.)
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Maximum fibre optic length:
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200 feet (60 m). Optional signal booster available for
longer runs. Fibre can be cut with a knife.
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Ambient temperature range:
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-45 to +60 oC, product temperature range is
-45 to +85 oC.
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Battery lifetime:
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5 years continuous operation for both sender bar and
LCD display. Sender bar powered by replaceable lithium
battery module. Display powered by four alkaline
"D" cells.
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Display type:
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0.5" LCD with LED backlight.
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Display temperature drift:
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0
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Alarms:
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Four alarms, each consisting of a transistor
conducting to ground when the alarm is "on".
Each transistor has a rating of 100 mA at 24 volts DC.
An optional relay interface is available for 115 VAC
applications. Alarms default "off" if the
signal from the sender bar is corrupted or lost.
Alarm temperature drift is zero.
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Remote communications:
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Two 4-20 mA two wire outputs for fluid volume and
temperature, optically isolated, 12 to 24 volt loop
voltage required. Optional optically isolated digital
output for Garnet remote display provides level,
volume, temperature, and alarms.
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4-20 mA output temp. drift:
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+/- 100ppm/oC
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Temperature sensors:
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Option of up to six sensors located inside the sender
bar, spaced 16" or 32" apart. Temperature
measurement range is from –40 oC to +99 oC,
accuracy is +/- 2 oC worst case.
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Power requirements:
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Display/Sender Bar: None (operate from internal
batteries). Alarms: External indicators must provide
their own power. Relay interface requires 115 VAC.
4-20mA and digital transmitters must be externally
powered.
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Display enclosure:
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NEMA 4 rated fibreglass enclosure, 8 inches wide by 10
inches high by 6 inches deep.
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Float construction:
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Cylindrical, approximately 7.25 inches diameter by 4.5
inches high. Float material is polyethylene.
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Bar construction:
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One inch diameter 316 stainless steel tube houses reed
switches and temperature sensors. Optional PVC sheath
for bar permits operation in strong acids.
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Fitting requirements:
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Sender bar is held in place at the top with a one inch
compression fitting, requires a one inch female NPT
thread in the tank top. At tank bottom either a
weighted anchor or a weld in anchor can be used.
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Diagnostics:
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Display shows if signal from sender bar is corrupted
or lost. 900M SeeLeveL Multitester can measure battery
condition, check sender and display integrity,
exercise alarms, exercise 4-20 mA and digital outputs,
and can copy programming from one display to another.
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The 900 gauge has several programming options, all of
which are field programmable at any time from the
internal keypad. Programmable security codes
prevent unauthorized programming and can control which
gauge features are active. All memories are
retained even if the batteries are dead or removed.
For upright tanks with a linear calibration (equal
volume per inch of depth throughout the tank) the
barrels reading can be calibrated by entering a single
number for barrels per inch of depth.
For tanks on their side with a nonlinear calibration,
the barrels reading can be calibrated by entering a
table of values for inches of depth verses barrels of
volume. The gallons readout is automatically
calculated from the barrels readout. The volume
offset can be set to specify where the zero volume
point is in the tank. The temperature can be set
to read in degrees F or C.
The alarms can be set independently to any point in
the tank, and can be set to turn on or off as the
fluid level rises. The full scale of the volume 4-20mA
output is calibrated from the keypad, there are no
analog controls to adjust. The digital output
requires no calibration.
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