51-638 Echotel Model 338 Two-Wire Ultrasonic Transmitter
16
NOTE: P13–P19 are not used by the Model 338 transmitter.
1.6.3 Performance Enhancement
Registers 20 through 33 can be used to enhance the per-
formance of the Model 338 in specific applications.
P20: - - - a Damping
Factory default value for P20 is: 5 (60 seconds).
Parameter register 20 can be used to reduce undesired
fluctuations of the display and output, and enhance per-
formance in turbulent applications.
P22: - - - a Dome top tank compensation
Factory default value for P22 is: 0.
Non-contact ultrasonic transmitters can occasionally
receive two or more echoes when the transducer is mount-
ed in the center of a domed top tank. If the transducer can
not be positioned away from the center of the domed top,
the 338 provides compensation to reduce the effects of
multiple echoes.
P23: - - - a Register P23 is not used with the
Model 338
Factory default value for P23 is: 0.
a
Damping time
Little to no
Moderate to heavy
(seconds)
turbulence/agitation
turbulence/agitation
0
no filtering
only used for testing purposes
1
3
acceptable
not recommended
2
6
recommended
acceptable
3
10
recommended
recommended
4
30
recommended
recommended
5
60
recommended
recommended
a
Compensation
Situation
0
OFF
Use when the Model 338
can be mounted off center
in the domed top tank
1
ON
Use when the Model 338 is
mounted in the center of a
domed top tank
