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An electronic level gauge that provides precise levels of fluids in tanks up to 32' tall. Signal transmission format options include 4-20mA or 1-5V standards. |
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Patented microprocessor based digital system measures total fluid level with 1/4" resolution in tanks up
to 32 feet high (longer lengths are in development). |
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Self powered system allows stand alone operation with no external power.
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Large backlit LCD displays are easy to read in any lighting conditions and show product temperature, fluid level in inches, fluid volume and alarm status.
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Battery condition can be shown at the push of a button.
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Front panel keypad allows the display to be calibrated in the field, security codes control access to programming and allow the selection of which features are on or off.
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Programmable 4-20mA or 1-5V analog outputs for both volume and temperature.
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Polyethylene sender bar and float resist corrosion.
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Based on a highly reliable design with over five years of production.
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Temperature sensors are spaced every 16" in sender bar to provide average product temperature.
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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 +90 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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One
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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). Fibre can simplay be cut with a knife, no special tools required.
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Ambient temperature range:
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-45 to +60 °C, product temperature range is
-45 to +90 °C.
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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
"AA" 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.
Or two 1-5V three wire outputs for fluid volume and
temperature, optically isolated, 12 to 24 volt loop
voltage required.
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4-20 mA output temp. drift:
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± 20ppm/°C
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Temperature sensors:
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Sensors located inside the sender bar, spaced 16" apart.
Temperature measurement range is from -40°C to +99°C;
accuracy is ±2°C 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 1-5V transmitters must be externally powered.
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Display enclosure:
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NEMA 4 rated fibreglass enclosure, 6 inches wide by 8
inches high by 4 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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Nominal 1/2" polyethylene pipe houses reed switches and temperature sensors.
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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.
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The 900D4S monitor has several programming options, all of which are field programmable at any time from the front panel keypad. Programmable security codes prevent unauthorized access and controls 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 volume reading can be calibrated by entering a single number for volume per inch of depth. For tanks on their side with a nonlinear calibration, the volume reading can be calibrated by entering a table of values for inches of depth verses volume. 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 °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 or 1-5V outputs are calibrated from the front keypad, there are no analog controls to adjust. |
