numbers, press the right configuration button. Set the
numbers between –999 and 9999. The sum of the 4 mA
point and the span must not exceed 9999.
11. To store the information, press both configuration buttons
simultaneously for two seconds. Note that the meter
displays “----” for approximately 7.5 seconds while the
information is being stored. The LCD meter is now
configured.
Replace the cover
12. Make sure the rubber gasket is seated properly, replace
the transparent cover, and replace the retaining ring
.
TABLE 1. LCD Meter Modes.
Options
Relationship between Input Signal
and Digital Display
L in
L inF
Srt
SrtF
Linear
Linear with five-second filter
Square root
Square root with five-second filter
Square root function only relates to the digital display.
The bar graph output remains linear with the current signal.
Square root response
The digital display is proportional to the square root of the input
current where 4 mA = 0 and 20 mA = 1.0, scaled per the
calibration procedure. The transition point from linear to square
root is at 25% of full scale flow.
Filter response operates upon “present input” and “input
received in the previous five second interval” in the following
manner:
Display = (0.75 3 previous input) + (0.25 3 present input).
This relationship is maintained provided that the previous
reading minus the present reading is less than 25% of full scale.
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