HPV 茎流量传感器/Sap Flow Sensor

HPV茎流量传感器是一款校准型、低成本的热脉冲液流传感器，输出校准液流量、热速、茎水含量、茎温等数据，功耗低，内置加热控制，同时改善了传统的加热方式，其原理采用热脉冲速率泔�/span>＇�/span>HPV（�/span>，测量范围：-200~+1000cm/hr(热流速度)�?100~+2000cm3/cm2/hr (茎流通量密度)，可广泛用于于茎流量监测、植物茎流蒸发计算、植物茎流蒸腾量、植物灌溉等

植物茎流是树木内部的“水”运动，而蒸腾是从叶片通过光合作用蒸发流出的水分。树液流量和蒸腾量之间有很强的关联性，通常理解是同一回事。但是，严格地说，它们是不同的，这体现在它们是如何被测量的、�/span>

SAP流量以L/hr（或每天、每周等）为单位进行测量。蒸腾量以每小时、每天、每星期等毫米（mm）为单位测量、�/span>

蒸散野�/span>=蒸腾�?蒸发野�/span>

蒸腾量以毫米为测量单位，可与降雨量以毫米计作比较。随着时间的推移，降雨量（水输入）应与蒸腾量（输出）相匹配。如果蒸腾作用更高，通常是树木作物的蒸腾作用，那么这种差异必须通过灌溉来弥补、�/span>

蒸发量（evaporation），蒸发量是指在一定时段内＋�/span>由土壤或水中皃�/span>水分经蒸发而散布到空中的量、�/span>

1mm(降雨�?=1㎡地�?kg氳�/span>

1mm(蒸腾�?=1㎡叶面积�?升树液流量（水）

例如：在果园和葡萄园等有管理的树木作物系统中，蒸发量与蒸腾量相比非常小。因此，为了简化测量，通常忽略蒸发量，将蒸腾量取为平均蒸散量（ETo）、�/span>

技术指栆�/span>

测量范围９�/span>-200~+1000cm/hr(热流速度)

分辨率：0.001cm/hr

准确度：��0.1cm/hr

探针尺寸９�/span>��1.3mm*L30mm

温度位置：外10mm，内20mm

针距９�/span>6mm

探针材质９�/span>316不锈钡�/span>

温度范围９�/span>-30~+70ℂ�/span>

响应时间９�/span>200ms

加热电阻９�/span>39���?00J/m

电源９�/span>12V DC

电流：空闱�/span>5mA� 测量<270mA

信号输出９�/span>SDI-12

线缆９�/span>5m，Max 60m

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