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51-638 Echotel Model 338 Two-Wire Ultrasonic Transmitter
P04:
Range
Range is the maximum measuring distance. For level and
volume applications this is the distance from the face of
the transducer to the bottom of the tank.
LEVEL = P04 (programmed) – DISTANCE (as measured
from transducer face to liquid surface)
Since the measurement accuracy of the 338 depends on a
correct value of P04, it is critical to know the exact dis-
tance between the face of the transducer and the bottom of
the tank. If this value is unknown, it can be set using the
"GET LEVEL" command. Make sure the tank is empty,
or at the 0% level mark. While in P04, press the ENTER
key so that the four digit parameter is blinking. Press the
UP
+ DOWN
keys simultaneously for 3 seconds,
and the unit will display the measured distance between
the transducer face and the bottom of the tank. If satisfied
with the displayed value press the ENTER key to accept
this as the range value.
The factory default range value of 20 feet (6 meters) can
be displayed while in P04. Press the ENTER
key until
the four digit parameter is blinking, and then simultane-
ously press the NEXT
+ DOWN
keys. The default
value will be shown. Press the ENTER
key to accept
this value, or input the appropriate value for the specific
application.
Range values will be displayed as shown.
Engineering Unit
Display Format
m
x.xxx or xx.xx
cm
xxx.x
ft
xx.xx or xxx.x
inch
xxx.x
