SMT100 土壤温湿度传感器 SMT100土壤温湿度传感器是德国TRUEBNERS公司生产的一款低成本、高质量传感器，其原理是利用环形振荡器将信号的传输时间转换为测量频率，产生的频率>100MHz足以在粘性土壤中正常工作。SMT100结合了低成本FDR传感器的优点和TDR传感器的精度。与TDR一样，它测量信号的传播时间，以确定土壤的介电常数，像FDR一样，它把介电常数转换成一个易于测量的频率。提供SDI-12、RS485、0-10V和Modbus多种输出方式，可满足广大客户的需求。
土壤温湿度传感器应用范围：
气象、农业、土壤、温室、植物秸秆水分测量、土壤侵蚀、堆肥水分测量、积雪水分温度测量、土木绿化、多元化灌溉等领域
土壤温湿度传感器技术指标：
水分范围：0-60% VWC （Max：99%VWC）
分辨率：0.1% VWC或者更高
精度：±3％VWC 工厂校准@在0-50%VWC矿物土盐分~8ds/m
±1％VWC@土壤特定校准
温度范围：-40~+80℃
分辨率：0.01℃
精度：典型±0.2℃@-20~+50℃； 其它±0.4℃
介电常数：1（空气）~80（水）
分辨率：0.01
响应时间：50us
供电：4-24V DC
电流：40mA
信号输出：数字：RS485、Modbus、SDI-12
模拟:0 - 10 V
线缆长度：10m
尺寸：18.2 cm x 3 cm x 1.2 cm
土壤温湿度传感器 
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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