Abstract
A low cost automatic data acquisition system was developed for modified Bellani plate atmometers or ET gages (ETGs) that consisted of a float and pulley system with an optical encoder and a low cost data logger that detected switch closures. The system cost was approximately $200 to retro-fit an existing ETG. Laboratory testing of this system indicated that errors were in the range of errors reported for lysimeter data versus Penman Montieth ET o estimates and within the range of errors reported for ETGs compared to ET o estimates. The float and pulley system performed better under conditions of 4-6 mm ET during an increment (i.e. day) because errors associated with manual reading of the site tube were minimized. Future work on the system should include field testing.
| Original language | English (US) |
|---|---|
| Pages | 2683-2697 |
| Number of pages | 15 |
| State | Published - 2004 |
| Event | ASAE Annual International Meeting 2004 - Ottawa, ON, Canada Duration: Aug 1 2004 → Aug 4 2004 |
Other
| Other | ASAE Annual International Meeting 2004 |
|---|---|
| Country/Territory | Canada |
| City | Ottawa, ON |
| Period | 8/1/04 → 8/4/04 |
All Science Journal Classification (ASJC) codes
- General Engineering