Metex 3200U Ultrasonic Flow & Level Monitor - Manual (Page 12)

4-20mA CURRENT LOOP OFFSET
Some applications may require the 4-20mA output to be offset so that 4mA or 20mA corresponds to a
Level, Range or Flow other than Zero and Full Scale.
4mA at - use
Ç and È to set % output for 4mA. It is adjustable from -5% (3.8mA) up to 15% lower
than the 20mA setting. Adjustment resolution is 0.05% (0.01mA).
20mA at - use
Ç and È to set % output for 20mA (down to 15% greater than the 4mA setting and up
to 300%). Adjustment resolution is 0.05% (0.01mA).
DAMPING
Minimum damping allows fast response to level changes. Increasing damping slows the Ultrason's
response to level changes and is ideal to smooth the display and outputs in turbulent conditions.
Damping value is shown in percent (0-99%). Some experimentation may be required to select the
optimum damping value. A value of 20% is recommended for most applications. For fast level changes
(up to ½ inch/sec - 13 mm/sec), a
Damping value of 1% is recommended. Maximum is 99%.
If the Ultrason is unable to obtain repeated echoes the Damping setting will be automatically set to 1%
by the instrument.
REJECTION TIME (RejTime)
Rejection Time adjustment is a powerful Ultrason feature to suppress false echoes and the effects of
transient targets such as agitators, splashing, or turbulence. Rejection Time is shown in seconds. The
time value represents the number of seconds the Ultrason must receive repeated echoes from a new
target before indicating its level on the display and outputs. The factory default is 8 seconds and should
be ideal for most applications. Decreasing this value allows the Ultrason to respond more quickly to fast
level changes, and increasing the time value allows the Ultrason to reject false echoes from slow
sweeping agitators, tank filling streams, splashing, severe turbulence and steam. Minimum setting is 1
second (for fast level changes up to 1/2 inch/sec - 13 mm/sec). Maximum setting is 85 seconds. If the
Ultrason is unable to obtain repeated echoes the
RejTime setting will be automatically set to 1 second
by the instrument.
AquaMetrix
Ultrason
Page 12