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SMT100土壤溫濕度傳感器是德國TRUEBNERS公司生產(chǎn)的一款低成本、高質(zhì)量傳感器,,其原理是利用環(huán)形振蕩器將信號的傳輸時間轉換為測量頻率,產(chǎn)生的頻率>100MHz足以在粘性土壤中正常工作,。SMT100結合了低成本FDR傳感器的優(yōu)點和TDR傳感器的精度,。與TDR一樣,它測量信號的傳播時間,,以確定土壤的介電常數(shù),,像FDR一樣,它把介電常數(shù)轉換成一個易于測量的頻率,。提供SDI-12,、RS485、0-10V和Modbus多種輸出方式,,可滿足廣大客戶的需求,。
應用范圍:
氣象、農(nóng)業(yè),、土壤,、溫室、植物秸稈水分測量,、土壤侵蝕,、堆肥水分測量、積雪水分溫度測量,、土木綠化,、多元化灌溉等領域
技術指標:
水分范圍:0-60% VWC(Max:100百分VWC)
分辨率:0.1% VWC或者更高
精度:±3%VWC 工廠校準@在0-50%VWC礦物土鹽分~8ds/m
±1%VWC@土壤特定校準
溫度范圍:-40~+80℃
分辨率:0.01℃
精度:典型±0.2℃@-20~+50℃; 其它±0.4℃
介電常數(shù):1(空氣)~80(水)
分辨率:0.01
響應時間:50us
供電:4-24V DC
電流:40mA
信號輸出:數(shù)字:RS485,、Modbus,、SDI-12
模擬:0 - 10 V
線纜長度:10m
尺寸:18.2 cm x 3 cm x 1.2 cm
Characteristics of the three types of soil moisture sensors used in the SOMOMOUNT network. All values in the table are provided by the manufacturers (Delta-T Devices, 2008; IMKO, 2015; Truebner,, 2016).
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