Pulsar IMP Lite 10, Instruction Manual

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Page15
IMP LITE
This chapter explains how to undertake the various functions of your
IMP Lite
.
Where specific parameters are used, consult Parameter Guide in Chapter 5.
Setting up Your Application
Empty Distance
Empty Distance (P105) is the distance from the face of the transducer to the
material at the bottom of the vessel.
Span
Span (P106) is the distance from the empty level (0% full) to span (100%
full).
Near and Far Blanking
Near blanking ( P107 ) is the distance from the face of the transducer that the
Imp will not record a level nearer than. A typical reason to increase this from
the default value would be if you wish to ignore close in obstructions.
Far blanking ( P108 ) is the distance (as a percentage of empty level) beyond
the empty level that the Imp will read, the default is plus 20% of empty level.
If you wish to monitor further than the
empty level , then increase this figure,
so that the empty level plus the far blanking figure (as % of empty level) is
greater than the surface being measured, within the capability of the
transducer being used.
Using the 4-20 mA Output
The mA output can be used to monitor remotely what the
IMP Lite
is showing,
so it can be displayed remotely, integrated into a PLC, or used to generate a
record using a chart recorder or similar.
By default, the
IMP Lite
will provide a 4-20 mA output that represents what is
displayed on the Imp, but these parameters can be overwritten as follows.
By default, the 4-20 mA will represent the empty level (4mA) and 100% of
the operational span (20mA), but you may wish to only represent a section of
the operational span. For example, the application may have an operational
span of 6 metres, but you may only wish to represent empty level to 5 metres.
If so, change
P834 (Low Value) to 0 , and P835 (High Value) to 5.0.