51-616 Echotel Model 350/351 Ultrasonic Non-Contact Level Transmitter
8
STEP 2
RANGE (RNGE)
(4 mA)
–
Range is the distance from
the face or the bottom of the transducer to the farthest
point to be measured. The maximum range for the
Model 350/351 is approximately 25 feet (7.6 m). With
RNGE
displayed, press
to continue. The display will
read
MANL
for manual entry of the range value. Use either
the
or
key to toggle between
MANL
and
AUTO
.
If
MANL
is selected, press
to display the current oper-
ating value. Use the
or
keys to raise or lower the
numeric value. Holding down the keys for several seconds
will increase the rate at which the values are changed.
When the desired value is displayed, press the
key to
accept this value and to exit
RANGE
.
Selecting
AUTO
will allow for the 350/351 to actually
measure the distance between the face of the transducer
and the current liquid level. This selection can be used as a
convenience when the level of the material being measured
is at a desired minimum level. Press
to display the cur-
rent range. There is no time limitation in this selection.
Press
once again to accept the value and to exit
RANGE
. Press the
key to proceed to
STEP 3
–
SPAN (SPAN)
.
NOTE: When using the AUTO mode in range or span, the 350/351
must first be manually programmed with values for range and
span which are larger than the expected values. This allows
the 350/351 to automatically measure the correct values with-
in the programmed window of accepted signals.
STEP 3
SPAN (SPAN)
–
Span is the difference between the lowest
level (empty tank) and the desired maximum level.
Maximum span is the range value, less the 12" dead zone
in which measurement cannot take place. With
SPAN
dis-
played on the LED, press
to display
MANL
for manual
entry of the span value. Use either the
or
key to
toggle between
MANL
and
AUTO
.
If
MANL
is selected, press
to display the current oper-
ating value. Use the
or
key to raise or lower the
numeric value. When the desired value is displayed, press
the
key to accept this value and to exit
SPAN
.
Selecting
AUTO
will allow the 350/351 to actually mea-
sure the distance between the face of the transducer and
the current material level, and calculates the span based on
that measurement. This selection is used in applications
when the level of the material being measured is at a desired
maximum level. Press
to display
SPAN VALUE
.
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