HMP155A 探头监测0 到 100% RH范围内的相对湿度,和-80° to +60°C范围内的温度。作为气象站系统或单个设备的一部分,HMP155A可为广泛的应用提供可靠的测量。所有的坎贝尔数据采集器都兼容HMP155A探头。
HMP155A 使用HUMICAP®180R电容型薄膜多聚物传感器来测量相对湿度,和一个PRT传感器来测量温度。
为了减小功耗,可以仅在测量期间给HMP155A供电,此时可应用数据采集器的开关12 V端子。对于没有开关12 V端子的数据采集器,例如CR510 或 CR7,可使用SW12V 开关12 V模块来切换控制HMP155A传感器的供电。
Electromagnetic Compatibility | Complies with EMC standard EN61326-1 Electromagnetic |
Filter Description | Sintered PTFE |
Housing Body Material | PC |
Housing Classification | IP66 |
Voltage Output | 0 to 1 Vdc |
Average Current Consumption | ≤ 3 mA (analog output mode) |
Operating Voltage | 7 to 28 Vdc |
Settling Time | 2 s (at power up) |
Field-Replaceable Chip or Recalibrate | Recalibrate |
Tip Diameter | 1.2 cm (0.5 in.) |
Length | 27.9 cm (11 in.) |
Head Height | 4 cm (1.6 in.) |
Body Height | 2.4 cm (0.9 in.) |
Body Width | 2.0 cm (0.8 in.) |
Relative Humidity |
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Sensing Element | HUMICAP 180R |
Measurement Range | 0 to 100% RH (non-condensing) |
Response Time |
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Factory Calibration Uncertainty |
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Accuracy |
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Air Temperature |
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Sensing Element | PT 100 RTD 1/3 class B IEC 751 |
Measurement Range | -80° to +60°C |
Accuracy |
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Entire Temperature Range | Refer to graph in probe manual. |
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Product | Compatible | Note |
---|---|---|
CR1000X (retired) | ||
CR300 (retired) | ||
CR3000 (retired) | ||
CR310 | ||
CR350 | ||
CR6 | ||
CR800 (retired) | ||
CR850 (retired) |
When exposed to sunlight, the HMP155A must be housed in a 41005-5 or RAD14 14-plate naturally aspirated radiation shield. The 41005-5 and RAD14 attach to a crossarm, mast, or user-supplied pipe with a 2.5 to 5.3 cm (1.0 to 2.1 in.) outer diameter. The RAD14 uses a double-louvered design that offers improved sensor protection from driving rain, snow, and insect intrusion, It also has lower self-heating in bright sunlight combined with higher temperatures (> 24°C [~75°F])
and low wind speeds (< 2 m s-1 [~4.5 mph]), giving a better measurement.
Description: Example CR1000X programs that measure either the analog voltage or RS-485 output of the HMP155A. The analog voltage programs use either the VoltSE or VoltDiff instruction and switch power to the sensor only during measurements. One program also calculates the mean vapor pressure. The RS-485 program measures the RS-485 output with an SDM-SIO1A/SIO4A. Although these programs are written for the CR1000X, programs for other dataloggers will be similar.
HMP155A-L: 7
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The maximum cable length is 304 m (1000 ft).
No. The HMP155A-L requires the 41005-5 14-Plate Solar Radiation Shield.
Note the difference between calibration and a field check. Calibration cannot be done in the field, as it requires an experienced technician and specialized equipment.
Field checks of measurements can be done to determine if the data make sense with the real-world conditions. Follow these steps to field check a sensor:
大多数 Campbell Scientific 传感器的型号中都带有 –L,它表示用户指定线缆长度。如果传感器型号名称列有 –LX (这里 “X” 是其它的某个字符), 那么该传感器需要用户指定长度,但线缆尾端会配有用于某个独特系统的特殊快速接头:
如果一个传感器的主型号数字的后面没有被指定 –L 或其它的 –LX 字符,那么该传感器将具有固定的线缆长度。在产品页面订购栏中 (Ordering tab) 的描述字段的末尾,会列出线缆的长度。例如 034B-ET 型号的描述字段含有信息:Met One风传感器适用于ET气象站,67英寸线缆 (Met One Wind Set for ET Station, 67 inch Cable)。产品按固定的线缆长度做尾端处理,默认是尾线方式。
如果线缆尾端配有用于某个独特系统的特殊快速接头,则型号尾部的字符会指定该传感器用于哪一个系统。例如,034B-ET 型号表明该传感器是一个 034B 且用于 ET107 系统。
不是每一种传感器都有不同的线缆尾端选项。通过查找传感器产品页面的订购栏 (Ordering tab) 中的两个位置,可以检查某种特定传感器的可用的线缆尾端选项:
如果传感器以 –ET, –ETM, –LC, –LQ, 或 –QD 等版本的型号供应,那么线缆尾端选项已经反映在该传感器的产品型号中。例如,034B 以 034B-ET, 034B-ETM, 034B-LC, 034B-LQ, 和 034B-QD 等型号供应。
所有其它的线缆尾端选项,如果可用,会列在该传感器产品页面的订购栏 (Ordering tab) 中的线缆尾端选项 (“Cable Termination Options) 区域。例如,034B-L 风速风向传感器具有 –CWS, –PT, 和 –PW 等线缆尾端选项,显示在 034B-L 产品页面的 订购栏 (Ordering tab) 位置。
注: 当更新的产品添加到我们的库存中时,一般来说,我们会在单个传感器的产品型号下面列出多种线缆尾端选项,而不是创建多个产品型号。例如,HC2S3-L 具有 –C 线缆尾端选项用于连接到 CS110,而我们并没有使用 HC2S3-LC 产品型号。
Campbell Scientific 的很多传感器都有可行的不同线缆尾端处理选项,包括以下几种:
注: 线缆尾端选项的可行性因传感器而异。例如,传感器可能会有 无选项、两个选项或几个选项可供选择。如果预期的选项没有列在所指定的传感器中,请联系 Campbell Scientific 的应用工程师寻求帮助。
Single-ended channels are typically used when it is desirable to use fewer channels and the cable length is shorter—less than 6.1 m (20 ft). Differential channels are preferable when the cable needs to be longer than 6.1 m (20 ft).