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The OBS501 is a submersible turbidity probe with active antifouling capabilities for better measurements in biologically active water with both high and low turbidity. It outputs an SDI-12, digitally processed signal that many of our data loggers can measure. The OBS501 is similar to the OBS500, but the OBS501 has better mechanical performance in heavy sediment/sand conditions.
続きを読むDesign features of the OBS501 include the combination of a backscatter sensor (better at measuring higher turbidity) with a second sidescatter sensor (better at measuring lower turbidity). It has a shutter that is opened only during measurements, which reduces the time that algae or other organisms can cling to its optics.
The OBS501 is constructed to prevent sand grains or packed sediment from getting wedged between the shutter and sensor body, which inhibits the shutter’s movement. To do this, the OBS501's shutter and body were designed to eliminate parallel surfaces between moving parts wherever possible. The probe also uses a flushing action that moves the sediment down and out of the cavity behind the shutter.
To prevent biofouling and ensure better measurements, the OBS501 incorporates the ClearSensor Method (U.S. Patent No. 8,429,952. This method uses a shutter/wiper mechanism to protect and clean the optics. With the ClearSensor method, a chamber is also filled with a biocide that continuously leaches out over the optics while the probe shutter is in the closed position. ClearSensor® and OBS® are registered trademarks of Campbell Scientific.
The OBS501 can sense if the shutter’s motor is working harder than normal. If it is, the shutter moves slightly back and forth to dislodge sand grains before fully opening or closing.
Campbell Scientific offers a disposable, plastic sleeve that can make cleanup a snap, as well as a copper sleeve that can provide additional protection, especially in sea water.
Dual Probe | 90° sidescatter and backscatter |
Measurement Range | 0 to 4000 NTU |
Active and Passive Antifouling | Shutter, wiper, biocide, copper, optional removable sleeve |
Accuracy | ±2% of reading or 0.5 NTU (whichever is greater) |
Operating Temperature Range | 0° to 40°C |
Storage Temperature Range | 0° to 40°C |
Temperature Accuracy | ±0.3°C |
Emitter Wavelength | 850 nm |
Power Requirements | 9.6 to 18 Vdc |
Measurement Time | < 10 s |
Maximum Submersion Depth | 100 m (330 ft) |
Diameter | 4.8 cm (1.88 in.) |
Maximum Cable Length |
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Length | 27 cm (10.63 in.) |
Weight | 0.59 kg (1.30 lb) |
Power Consumption |
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Quiescent | < 200 µA |
Measurement | < 40 mA |
Communication | < 40 mA |
Active Shutter Motor | < 380 mA |
Outputs |
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SDI-12 | Version 1.3, 1200 bps |
RS-232 | 9600 bps, 8 data bits, 1 stop bit, no parity, no flow control |
Analog | 0 to 5 Vdc |
注意: 以下は代表的な互換性情報を示しています。互換性のある製品や互換性のない製品をすべて網羅したリストではありません。
製品 | 互換性 | 注意 |
---|---|---|
21X (リタイア) | ||
CR10 (リタイア) | ||
CR1000 (リタイア) | ||
CR1000X (リタイア) | ||
CR10X (リタイア) | ||
CR200X (リタイア) | ||
CR206X (リタイア) | ||
CR211X (リタイア) | ||
CR216X (リタイア) | ||
CR23X (リタイア) | ||
CR295X (リタイア) | ||
CR300 (リタイア) | ||
CR3000 (リタイア) | ||
CR310 | ||
CR500 (リタイア) | ||
CR5000 (リタイア) | ||
CR510 (リタイア) | ||
CR6 | ||
CR800 (リタイア) | ||
CR850 (リタイア) | ||
CR9000 (リタイア) | ||
CR9000X (リタイア) |
OBS501に関するよくある質問の数: 1
かつては、すべての濁度センサの単位は NTU でした。2007 年に、ASTM 委員会が結成され、濁度センサ技術の各カテゴリごとに異なる単位が制定されました。これらの単位は数多くあります。OBS-3+ や OBS501 などの後方散乱センサの単位は FBU (フォルマジン後方散乱単位) ですが、ISO 7027 側方散乱センサの単位は FNU (フォルマジン比濁単位) です。側方散乱 OBS501 センサと ClariVue™ センサはこのカテゴリに属します。異なる技術設計のセンサを較正してフォルマジンを同じように測定することはできますが、粒子のサイズ、形状、色、反射率などが変化する自然水中では、同じ測定は行われません。ClariVue™ センサの測定値は、自然水中の OBS-3+ の測定値と一致しません。
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