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7.2 Features
This section will describe in more detail some of the LCD Menus and new features exclusive to models
LTM-250/350.
Scrolling Option: When choosing not to scroll the main menu the following options can be chosen by pressing
the up and down push buttons
(exclusively for models LTM-250/350).
1. Display? Display? Display? Display? Display? Display?
Scroll (or) Level (or) Intrface (or) Temp (or) mA Out (or) % Range
The “Scroll” option will vary depending on how many outputs are configured.
Rate of Change (RoC) Filter: The RoC filter is a continuous monitor of how fast (the rate) the level is rising
and falling. It is also an excellent tool to help eliminate any temporary spontaneous noise that may be present
in-field. For example if the level in a tank cannot rise or fall faster than 30.0 in/s then the setting for the RoC
filter should be set to 15.0 in/s or less to help filter/ignore erroneous readings. Note: The engineering units will
change according to units selected (i.e. cm/s) –
(exclusively for models LTM-250/350).
Offset: The offset is a digital number that gets added to both the LRV and URV to account for any distance
below the sensor probes measuring distance. For example if the offset is changed from “0.00in” to “2.00in” the
‘Level’ on the main screen will show “2.00in” at 4.00mA and the 20.00mA value will simply have 2.00 inches
added to it.
The span will not change and the 4/20mA will not shift from its original calibrated points. This offset
value will also add to the interface level when available.
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