SMT100 土壤溫濕度傳感器 SMT100土壤溫濕度傳感器是德國TRUEBNERS公司生產的一款低成本、高質量傳感器，其原理是利用環形振蕩器將信號的傳輸時間轉換為測量頻率，產生的頻率>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，像FDR一樣，它把介電常數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。
土壤溫濕度傳感器應用范圍：
氣象、農業、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
土壤溫濕度傳感器技術指標：
水分范圍：0-60% VWC （Max：99%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：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
土壤溫濕度傳感器 
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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