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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。
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
技术指标:
水分范围:0-60% VWC(Max:100百分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
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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