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北京博伦经纬科技发展有限公司出厂的仪器设备被越来越多的顾客誉为最信得的产品。在加强企业内部管理的同时,公司更注重追求全体员工对产品质量的高度重视和对顾客的真诚奉献。我公司在不断地开拓市场、质量取胜、壮大自身的同时赢得了业内广泛赞誉。
禀承“追求质量、服务”的一贯宗旨,携手与您共创辉煌的明天。
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,其原理采用双方法(DMA)热脉冲法,测量范围:-200~+1000cm/hr(热流速度)或-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。
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。
蒸散量=蒸腾量+蒸发量
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。
蒸发量(evaporation),蒸发量是指在一定时段内,由土壤或水中的水分经蒸发而散布到空中的量。
1mm(降雨量)=1㎡地面1kg水
1mm(蒸腾量)=1㎡叶面积的1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)。
茎流量传感器广泛应用
计算总流量
低液流和零液流速率
反向液流速率
夜间水分损失
根茎液流速度
贫瘠生态系统及干旱
径向液体流速
葡萄藤的液流
茎流量传感器 技术指标
测量范围:-200~+1000cm/hr(热流速度)
分辨率:0.001cm/hr
准确度:±0.1cm/hr
探针尺寸:φ1.3mm*L30mm
温度位置:外10mm,内20mm
针距:6mm
探针材质:316不锈钢
温度范围:-30~+70℃
响应时间:200ms
加热电阻:39Ω,400J/m
电源:12V DC
电流:空闲5mA, 测量<270mA
线缆:5m,*大60m
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