For instructions on using multipoint scaling, see Level Input Multipoint Linearization (MULTIPT).
For instructions on how to program numeric values see Setting Numeric Values.
3.5.5
Minimum Input Span
The minimum input span is the minimum difference between input 1 and input 2 signals required
to complete the calibration or scaling of the meter. The minimum span is 0.10 mA.
3.5.6
Scale Error Message (
SPN ERR
)
If the minimum span is not maintained, the meter will show a span error (SPN ERR) and revert to
input 2, allowing the appropriate input signals to be applied.
3.5.7
Scaling the Tank Height Indicator (
TANK HT
)
The display includes a 20-segment tank level indicator. This menu sets full and empty values, in
engineering units, for the tank level indicator.
This value may differ from the 20 mA full-scale and 4 mA empty-scale values programmed in the
Scale menu. This is ideal for level transmitters that output less than 20 mA at the maximum height
of the tank or pit or more than 4 mA at the minimum height.
As an example, when using a level transmitter that outputs 20 mA at 25 meters, the tank height
indicator may be set for a maximum of 10 meters. When the meter reaches 10 meters on the
display, the tank height indicator will show full, even though the input is not 20 mA.
3.5.8
Configuring the Lower Display (
DISPLAY
)
The lower display may be configured to display a custom tag (
TAG
), volume (
VOLUME
), volume
and tag (
VOL+TAG
), percent of full height (
PCT HT
), or percent of full height and tag (
PCT+TAG
)
or be blank (
OFF
).
A custom tag may be up to seven alphanumeric characters programmed for identification
(e.g. TANK 3) or for engineering units (e.g.
GALLONS
).
Volume is a separate, second scale of the input process variable. This is configured in Volume
Display Scaling (
VOLSCAL
).
Percent full height shows the percent full of the tank height level indicator programmed in
the Scaling the Tank Height Indicator (
TANK HT
) menu.
The tank level indicator (
GRAPH
) may also be turned on or off from the display menu.
10 0
0300 0
Summary of Contents for TEK-LCD 7800A-0L1
Page 35: ...Main Menu Advanced Menu...
