Levelcom 100 - Page 8

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configured to operate from either supply air from a compressor or a nitrogen gas bottle. In

instances where a high-pressure bottle is used as the supply for the operating gas the

LevelCom 100 can be configured for minimal gas consumption.

For operation, the LevelCom 100 simply requires electrical power, a source of clean, dry air

and connection to a bubbler pipe in the tank. When power is applied, the LevelCom 100

performs a diagnostic check of system operations. To ensure accuracy, the instrument

performs a “hardware zero” by sampling the atmospheric air pressure external to the

instrument. In normal operation the LevelCom 100 automatically performs the hardware zero

at half hour intervals. This eliminates errors caused by drift of the sensor zero due to

temperature changes.

The LevelCom 100 automatically performs a purge of the bubbler pipe at power up. The

machine can be configured to purge the bubbler pipe regularly at a user-defined frequency

ranging from one hour to one week. The user also can establish the duration of the purge

with a range from five to 120 seconds. This guarantees that the machine enters normal

operation with the bubbler pipe purged of any liquid.

Each LevelCom 100 is field configured with the parameters and feature selections associated

with the tank to be monitored. These include:

• Depth in English or metric units

• Volume in gallons, liters, barrels or cubic feet

• Weight in short, long or metric tons

• 10 point Tank Table defining the relation of depth to volume/weight

• Timing of sample and purge cycles

• Specific gravity

• Four alarm points with hysteresis

• A user defined password

• A Hot Menu to access certain user-selectable features without a password

Units of measure (depth, volume and weight) may be changed after initial configuration

without reprogramming the unit. For example, if the LevelCom 100 is configured to measure

depth in feet/inches and later it becomes necessary to change to metric units, the user simply

changes the depth unit of measure. The LevelCom 100 will automatically convert the English

value and display the correct depth in metric units. Tank table and alarm setpoint units are

also automatically converted at the same time.

The LevelCom 100 is self-diagnostic and will detect some hardware errors, bubbler pipe

and supply line problems including leaks, plugged lines and low supply air pressures. If an

abnormal condition is detected, the LevelCom 100 will display the appropriate error message

on the digital display and activate an alarm to alert the operator.

The LevelCom 100 is contained in a water-resistant enclosure fabricated of .090" 5052 H32

aluminum alloy.