Principle Of Operation; Measurement Mode - Level Pro ITC 250 SERIES User Manual

250 SERIES
Loop Powered Display
ENTER

6. PRINCIPLE OF OPERATION

Power to the 250 Series display is supplied from current loop. To ensure the display functions
correctly the signal of the current loop must be greater than 3.5mA. If signal value is below 3.5mA a
running decimal point is displayed. Device configuration using remote controller is possible if signal
value of current loop is greater than 10mA (Located on front panel LED marked "IR").
6.1 MEASURING PRICIPLE
The measurement range equal to the nominal range is called: nominal measurement range,
and the measurement range equal to the extended nominal range is called: permissible
measurement range (figure 6.1).
"Lo r" parameter
If the result of measurement exceeds the permissible measurement range, warning "-Hi-" or "-Lo-" is
displayed rather than input signal, depends on exceeded value (see description of "Lo r" i "Hi r"
parameters, paragraph "inPt" menu).
If the measurement value do not exceed the permissible measurement range, but displayed value
exceeds range -999 ÷ 9999, the warning "-Ov-" is displayed rather than the calculated result.
Symbol used in the manual : [ENTER]
Functions :
• Start to edit the parameter
• Enter into the sub-menu
• Confirmation of changes made in parameter being edited
Symbol used in the manual : [^] [v]
Functions :
• Change of the present menu
• Modification of the parameter value
• Change of the display mode
Figure 6.1. Definitions of measurement ranges in mode 4 ÷ 20mA
"Hi r" parameter
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