濁度センサ / OBS-3+
RETIRED ›
This product is no longer available and has been replaced by: CLARIVUE10.
OBS-3+ Turbidity Sensor
利用できるサービス
修理 非対応
キャリブレーション 非対応
フリーサポート 対応

概要

The OBS-3+ is a submersible turbidity probe that has sideways-facing optics. It uses OBS technology to measure suspended solids and turbidity for applications ranging from water quality in freshwater rivers and streams to sediment transport and dredge monitoring. Campbell Scientific data loggers measure the OBS-3+ probe's output and calculate turbidity.

続きを読む

利点と特徴

  • Sideways facing optics avoid obstructions above and below the probe
  • Measures suspended solids and turbidity for up to 4000 NTUs
  • Provides a compact, low-power probe that is field proven
  • Compatible with most Campbell Scientific data loggers
  • Accurate and rugged
  • Stainless-steel body allows use down to 500 m in fresh water
  • Titanium body allows use down to 1500 m in fresh or salt water
  • Fitted with MCBH-5-FS, wet-pluggable connector—multiple mating cable length options available
  • Offers an optional five-point sedimentation calibration for better measurements (see Ordering Info on the web page)

イメージ

詳細

The OBS-3+ uses its sideways-facing optics to emit a near-infrared light into the water. It then measures the light that bounces back from the water’s suspended particles.

If an obstruction is in the emitted light’s range, the light will scatter back and the turbidity reading will be too high. This probe's sideways-facing optics avoids obstructions above and below the probe. The OBS300 is available for locations that have obstructions around the sides of the probe.

OBS® is a registered trademark of Campbell Scientific.

仕様

Range
  • 0 to 250 NTU
  • 0 to 500 NTU
  • 0 to 1000 NTU
  • 0 to 3000 NTU
  • 0 to 4000 NTU
Maximum Submersion Depth
  • 500 m (1640.5 ft) for stainless-steel body
  • 1500 m (4921.5 ft ) for titanium body
Concentration Accuracy
  • 2% of reading or 1 mg/l (whichever is larger) for mud
  • 4% of reading or 10 mg/l (whichever is larger) for sand
Maximum Concentration Range
  • Maximum concentration depends on sediment size, particle shape, and reflectivity.
  • 5,000 to 10,000 mg/l (for mud)
  • 50,000 to 100,000 mg/l (for sand)
Operating Temperature Range 0° to 40°C
Drift over Time < 2% per year
Maximum Data Rate 10 Hz
Minimum Warm-up Time 2 s
Infrared Wavelength 850 nm ±5 nm
Daylight Rejection -28 dB (re: 48 mW/cm-2)
Optical Power 2000 µW
Turbidity Accuracy 2% of reading or 0.5 NTU (whichever is larger)
Housing Material 316 stainless steel or titanium
Connector MCBH-5-FS, wet-pluggable
Diameter 2.5 cm (0.98 in.)
Height 14.7 cm (5.79 in.)
Weight 181.4 g (0.4 lb)

-2.5 Output Option
Output Voltage 0 to 2.5 V (over selected NTU range)
Supply Voltage 5 to 15 Vdc
Current Drain 15 mA

-5 Output Option
Output Voltage 0 to 5 V (over selected NTU range)
Supply Voltage 5 to 15 Vdc
Current Drain 15 mA

-20 Output Option
Output Voltage 4 to 20 mA (over selected NTU range)
Supply Voltage 9 to 15 Vdc
Current Drain 45 mA

互換性

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。

Data Loggers

製品 互換性 注意
21X (リタイア)
CR10 (リタイア)
CR1000 (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)

よくある質問

OBS-3+に関するよくある質問の数： 19

すべて展開すべて折りたたむ

  1. Is it possible to operate an OBS-3+ or OBS300 onboard a vessel while the vessel is in motion?

    This has not been tested; however, it is likely that, as the sensor moves through the water, disturbances or bubbles are created that could distort the turbidity measurements.

  2. What size is the arc that the OBS-3+ or OBS300 measures?

    The beam divergence angle of the sensor is 42°. (Within this 42° cone, 95% of the beam power is contained.)

  3. Are data from the OBS-3A comparable with data from the OBS-3+ or OBS300?

    These devices employ optical backscatter to measure light absorption and should produce comparable data, but variation is likely between sensors.

  4. What is the accuracy and deviation from actual NTU in the low range for the OBS-3+ or OBS300?

    The accuracy is 0.5 NTU or 2% of reading.

  5. What type of maintenance is needed for the OBS-3+ or OBS300?

    The following are some suggestions:

    • Keep the optics clean.
    • Site-specific field calibration may be necessary for the best performance. 
    • Prevent the sensor from freezing.
  6. Can the OBS-3+ be installed on a pipe?

    Generally, no, as this presents some hazards. For example, this sensor’s field of view in very clear water may extend 20 in., so a pipe less than 20 in. in diameter may distort the readings. Except for very turbid water, Campbell Scientific does not recommend placing this sensor in a pipe.

  7. Is it possible to adjust an OBS-3+ or OBS300 for measurements up to 4,000 NTUs?

    Sensors are calibrated at the factory for measurements up to 4,000 NTUs, if requested at the time of order. Sensor ranges cannot be adjusted outside the factory.

  8. What is the difference between the OBS-3+ and the OBS300?

    The OBS-3+ and the OBS300 are essentially the same sensor but with differing optic placement. The OBS-3+ has sideways-facing optics, whereas the OBS300 has downward-facing optics.

  9. Is a version of the OBS-3+ available that has a 1500 m rating with a biofouling control (wiper or shutter)?

    This sensor is available with two types of wipers.

    • The Hydro-Wiper-C is a battery powered mechanical wiper with a scheduled wiping frequency.
    • The Hydro-Wiper-D is a mechanical wiper that is controlled and powered by the data logger.
  10. What type of handheld display can be used with the OBS-3+ or OBS300?

    Campbell Scientific does not offer a display that can be attached directly to the sensor; however, the data logger used to capture and record the data may have a display.

よくある質問一覧はこちら

Privacy Policy Update

We've updated our privacy policy.  詳細はこちら

Cookie Consent

Update your cookie preferences.  クッキーの設定を更新する