Continuous Level Switch System with LCD Display

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Manufacturer: Omega(USA)

Model: LVR300 Series

Introduction:

     The complete LVR300 Series Sensor is designed to be a self-contained continuous level sensor and control, requiring only a power source. A 16-bit microcontroller with a 14-bit A/D converter and a 12-bit D/A converter provides the necessary processing speed and measurement accuracy. The signal is displayed with units using a back-lit LCD graphical display and converted to a 4-20 mA signal. Two switch points with either a positive or negative output can be programmed over the complete range.

     The switching point hysteresis can be set separately in value and direction (minimum/maximum switching value). Upward and downward crossings of switching points and error messages are shown in the display with a flashing red LED that is easily visible from a distance.

     Other parameters can be changed using codes, including: signal filter; selectable unit (inch, cm) includes automatic conversion of the values; selectable 0-20 mA or 4-20 mA output; value assignment of 4-20 mA (setting of zero point and span). The complete housing can be rotated around the mechanical connection so that the correct reading position can be set after mounting (installation).

     This LVR300 Series is very easy to use, as dialog messages are displayed for the user. It can even be set when wearing protective gloves, if necessary.

Specifications: 

Input Power: 9 to 30 Vd
Power Consumption: <1 W
Outputs: 4 to 20 mA and two 300 mA programmable switch outputs (PNP or NPN selectable)
Wetted Materials: 316 SS stem, polypropylene float
Mounting: 2 NPT
Temperature Display: 0 to 70°C (32 to 158°F)
Process: 0 to 105°C (32 to 221°F)
Pressure: 6.8 bar (100 psig)
Specific Gravity of the Float: 0.75

General Information:

1.  Continuous Level Sensors should be installed rigidly so the float is free to move as the liquid level changes.
2.  Continuous Level Sensors should be mounted in a tank area free of severe turbulence or protected from such turbulence by appropriate and adequate slosh shields.
3.  Continuous Level Sensors stems should be vertical for best results, but satisfactory operation is possible in most liquids with the stem at up to a 30º angle from vertical.
4.  Care should be taken that Continuous Level Sensors are always operated within electrical ratings.

Cautions:

1.  The pressure, temperature and electrical limitations shown for the specified level sensor must not be exceeded.
2.  The pressures and temperatures must take into consideration possible surges in the temperature and pressure of the system.
3.  The liquids used must be compatible with the materials of construction. Specifications of materials will be given upon request.
4.  Life expectancy of the sensor varies with applications.
5.  Ambient temperature changes can affect sensor set points, since specific gravities of liquids vary with temperature. Consult factory for assistance.
6.  Level sensors have been designed to be shock and vibration resistant. For maximum life, both should be minimized. Consult factory for assistance.
7.  Excessive contaminants in fluid may inhibit float operation and occasional wipe down may be necessary.
8.  Physical damage to product may render product unserviceable.
9.  Installation in a vessel made from magnetic materials may affect operation.

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