The scope of this work was to develop and evaluate a data acquisition system (DAS) to automate sprinkler
uniformity distribution testing. The system was designed to perform indoor tests for low and medium pressure sprinklers
using a two radii collector pattern. The data acquisition system consisted of a PC/AT 386 computer connected to an A/D
converter, which received signals from 16 collector-transducer devices. The measuring principle of those collectors was
to use the output of load cells to estimate the volume accumulated inside each collector. Four tests of the Naan 501-U
sprinkler were conducted to evaluate the system performance. Weight readings were taken at 30, 60, 90, and 120 min
during each test. The average volume weight readings taken at the end of the tests (120 min) were compared to volume
values estimated using a digital scale. Those readings were used to create an overlapping grid pattern for a 6 m (19.7 ft)
×6 m (19.7 ft) sprinkler spacing. Statistical parameters and uniformity coefficients were calculated for both methods
(DAS and scale). Sprinkler discharge and operating pressure were monitored by transducers connected to the system. No
statistical differences were found between recording methods (P < 0.05). The same conclusion could be made for the
uniformity coefficients. The maximum standard deviation of measurement dispersion for the data acquisition system
readings was 0.35 mL (0.01 oz). The results showed that the DAS is a reliable system for sprinkler uniformity testing
using a radius pattern. The developed automated system proved to be easy to install without requiring specific skills to
assemble.
[1]
Wesley W. Wallender,et al.
Collector Size and Test Duration Effects on Sprinkler Water Distribution Measurement
,
1988
.
[2]
Dennis C. Kincaid.
Sprinkler Pattern Radius
,
1982
.
[3]
Ido Seginer,et al.
Indoor Measurement of Single-Radius Sprinkler Patterns
,
1992
.
[4]
Nader Foroud,et al.
Instrumentation for Simultaneous Recording of Water Level in Digital and Graphical Forms
,
1989
.
[5]
W. K. Bilanski,et al.
Factors That Affect the Distribution of Water from a Medium-Pressure Rotary Irrigation Sprinkler
,
1958
.
[6]
Ken Solomon.
Variability of Sprinkler Coefficient of Uniformity Test Results
,
1979
.