Levelcom 100 - Features and Definitions; Core Features Explained

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Page 9

Features and Definitions

The following are definitions and explanations of LevelCom 100 features and the terminology

used in this manual and the LevelCom 100 configuration interface.

Alarm Setpoint: A user defined reference point that establishes the depth at which a

particular alarm will activate.

Bubbler: A bubbler is a remote sensing liquid level gauge that operates by measuring the

pressure required to blow bubbles from the bottom of a pipe mounted in a tank. If the

specific gravity of the liquid is known, this pressure can be converted to depth of the end of

the pipe below the liquid surface.

Bubbler Pipe: This refers to the pipe installed in the tank and connected to the LevelCom

100. To sense depth the LevelCom 100 blows bubbles from the bottom of this pipe. The

Bubbler to Bottom parameter is the distance between the lower end of the bubbler pipe and

the bottom of the tank.

Buttons: The LevelCom 100 has a set of buttons built into the face plate. These are used

to enter the configuration information into the device, and to locally acknowledge alarm

conditions. In normal operation the buttons may be used to display alternate units, for

example changing from a depth default to read volume or weight. Also the current units may

be read.

Calibrate: The LevelCom 100 is shipped fully calibrated and while in operation automatically

performs a periodic “hardware zero”. Should the unit require field calibration please

reference the calibration procedure beginning on page 72.

Communication: The LevelCom 100 can be purchased with optional communication

interfaces that allow a group of LevelCom 100s to be networked to a central control or data

acquisition computer. These interfaces include RS-422/RS-485 using standard Modbus RTU

Protocol. The machine may also be equipped with interfaces for DeviceNet, or Profibus

communication networks.

Configuration: The LevelCom 100 program allows users to configure the unit to a wide

variety of situations. The unit is shipped with a default configuration and the user adjusts the

parameters to match his own requirements thereby establishing the machine configuration.

Demand: The user may configure the LevelCom 100 to perform sample and/or purge

functions on demand in lieu of automatic timed cycles. This feature is normally used in areas

where the quantity of compressed air is limited or in applications not requiring constant

monitoring.

Hardware Zero: The LevelCom 100 periodically checks the sensor for drift of the zero point

by measuring atmospheric pressure. This value is used to correct the raw pressure readings