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(chǎn)的一款低成本具有重要意義、高質(zhì)量傳感器研究，其原理是利用環(huán)形振蕩器將信號的傳輸時(shí)間轉(zhuǎn)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應用創新。SMT100結(jié)合了低成本FDR傳感器的優(yōu)點(diǎn)和TDR傳感器的精度提高。與TDR一樣，它測量信號的傳播時(shí)間的特性，以確定土壤的介電常數(shù)交流，像FDR一樣，它把介電常數(shù)轉(zhuǎn)換成一個(gè)易于測量的頻率提供堅實支撐。提供SDI-12還不大、RS485、0-10V和Modbus多種輸出方式信息化技術，可滿足廣大客戶的需求發揮作用。
土壤溫濕度傳感器應(yīng)用范圍：
氣象、農(nóng)業(yè)逐步顯現、土壤銘記囑托、溫室、植物秸稈水分測量傳遞、土壤侵蝕試驗、堆肥水分測量、積雪水分溫度測量開展攻關合作、土木綠化製度保障、多元化灌溉等領(lǐng)域
土壤溫濕度傳感器技術(shù)指標(biāo)：
水分范圍：0-60% VWC （Max：*VWC）
分辨率：0.1% VWC或者更高
精度：±3％VWC 工廠校準(zhǔn)@在0-50%VWC礦物土鹽分~8ds/m
±1％VWC@土壤特定校準(zhǔn)
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(yīng)時(shí)間：50us
供電：4-24V DC
電流：40mA
信號輸出：數(shù)字：RS485的有效手段、Modbus統籌推進、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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