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SF-110 | SF-421 | |
---|---|---|
测量范围 | -50 to 70 C | -50 to 70 C |
测量的不确定性 | 0.1 C (from 0 to 70 C), 0.2 C (from -25 to 0 C), 0.4 (from -50 to -25 C) | 0.1 C (from 0 to 70 C), 0.2 C (from -25 to 0 C), 0.4 (from -50 to -25 C) |
Measurement Repeatability | Less than 0.05 C | Less than 0.05 C |
长期漂移(非稳定性) | 每年少于0.02℃(在年平均温度小于30℃的非冷凝环境中使用时,连续高温或连续潮湿环境增加漂移率) | 每年少于0.02℃(在年平均温度小于30℃的非冷凝环境中使用时,连续高温或连续潮湿环境增加漂移率) |
Equilibration Time | 10 s | 10 s |
Self-heating | Less than 0.01 C (typical, assuming pulsed excitation of 2.5 V DC), 0.08 C at 5 C (maximum, assuming continuous input excitation of 2.5 V DC) | Less than 0.01 C |
Operating Environment | -50到70 c;0至100%相对湿度 | -50到70 c;0至100%相对湿度 |
输入电压要求 | 2.5 V直流刺激 | 5.5 to 24 V DC |
Output Voltage Range | 0 to 2.5 V DC (assuming input excitation of 2.5 V DC) | - |
电流消耗 | 0.1 mA DC(热敏电阻)在70℃(最大,假设连续输入激励为2.5 V DC) | 0.6 mA (quiescent), 1.3 mA (active) |
Dimensions | 570 mm length, 21 mm pipe diameter, 70 mm disk diameter | 570 mm length, 21 mm pipe diameter, 70 mm disk diameter |
Mass | 400 g | 400 g |
Frost damage to plants can have large impacts on crop yield and quality. Protection of crops during frost events is dependent on the accuracy of plant temperature predictions. Often, air temperature is not a reliable predictor of timing, duration, and severity of frost events because plant canopy temperatures can be significantly different than air temperature under certain environmental conditions.
On clear, calm nights, plant leaf and flower bud temperatures can drop below freezing even if air temperature remains above 0 C (see figure on following page). This is called a radiation frost and is due to the lack of air mixing (wind) near the surface, and a negative net longwave radiation balance at the surface (more longwave radiation is being emitted from the surface than what the surface is absorbing from the clear sky). Under cloudy and/or windy conditions, radiation frost events do not occur.
bob体育竞技Apogee仪器叶和芽温度传感器均设计为近似植物叶和花蕾温度以预测霜冻事件。当空气温度将近冻结时,辐射霜探测器旨在用于裁剪领域和果园的应用,并且空气温度测量不是霜形成的良好预测因子。
Apogee Instruments leaf and bud temperature sensors consist of two precision thermistors, one combined with a simulated leaf and the other a simulated bud, in a single housing. The leaf sensor is designed to mimic a plant leaf and the bud sensor is designed to mimic a flower bud. Leaf and bud temperature sensors provide close approximations to leaf and bud temperatures and can be used for prediction of frost on leaves and buds. Detectors are weatherproof and are designed for continuous temperature measurement in the same environmental conditions plants are exposed to.
Leaf and bud temperature estimates in cropped fields, orchards, and vineyards. Leaf and bud temperatures returned by the detector can then be used to alert growers to the potential of frost damage to crops.
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程序在.cr1x格式中,可以下载与Campbell Scientific DataLogger一起使用。右键单击,然后在浏览器中选择“保存目标为...”或等效命令。还可以使用WordPad或其他文本查看器查看它们。
Note:2020年,CR1000 Campbell Scientific Datalogger已停止。Click here to access the discontinued .CR1 format sample datalogger programs >
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