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The 108-LC is a version of the 108 that has a cable terminated in a connector rather than the standard pigtails. The connector can be attached to the CS110 lightning meter or to the ET107, ET106, or MetData1 weather stations.
The 108-L is a rugged, accurate probe that measures temperature of air, soil, or water from -5° to +95°C. Designed for durability and ease of installation/removal, the 108-L easily interfaces with most Campbell Scientific data loggers.
続きを読むFor this version of the 108 thermistor, the cable terminates in a connector rather than the standard pigtails. The connector can be attached to the ET107 Weather Station, ET106 Weather Station (retired), or MetData1 Weather Station (retired).
The 108-LC can be used to accurately measure the temperature of a variety of media, most commonly air, water, and soil. It consists of a thermistor encapsulated in a cylindrical aluminum housing. The 108-LC measures the range of -5° to +95°C; to measure the -35° to +50°C temperature range, see the 107-LC probe.
The 108-LC is suitable for shallow burial only. It should be placed horizontally at the desired measurement depth to avoid thermal conduction from the surface to the thermistor. Placement of the sensor cable inside a rugged conduit may be advisable for long cable runs, especially in locations subject to digging/mowing, traffic, use of power tools, or lightning strikes.
Sensor | BetaTherm 100K6A1IA Thermistor |
Tolerance | ±0.2°C (over 0° to 70°C range) |
Temperature Measurement Range | -5° to +95°C |
Steinhart-Hart Equation Error | ≤ ±0.01°C over measurement range (CRBasic data loggers only) |
Time Constant in Air | 30 to 60 s (in a wind speed of 5 m s-1) |
Maximum Submersion Depth | 15.24 m (50 ft) |
Probe Diameter | 0.762 cm (0.3 in.) |
Probe Length | 10.4 cm (4.1 in.) |
Weight | 136 g (5 oz) with 3.05-m (10-ft) cable |
The cable of the 108-LC provides a connector that attaches to the ET107 Weather Station, ET106 Weather Station (retired), or MetData1 Weather Station (retired). The ET107 Weather Station has an on-board CR1000M module. Both the MetData1 Weather Station and ET106 Weather Station have an on-board CR10X module.
When exposed to sunlight, the 108 must be housed in a radiation shield. It is typically housed in a 41303-5A 6-plate naturally aspireated shield. It may also be housed in a 41003-5 10-plate shield if a 41322 Adapter Plate is used.
To measure large numbers of probes, the AM16/32B multiplexer is recommended.
108-LCに関するよくある質問の数: 7
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すべてのセンサに異なるケーブル終端オプションがあるわけではありません。特定のセンサで利用可能なオプションは、センサ製品ページの注文情報エリアの 2 つの場所で確認できます。
モデル番号
ケーブル終端オプション リスト
センサが –ET、–ETM、–LC、–LQ、または –QD バージョンで提供されている場合、そのオプションが利用可能かどうかはセンサモデル番号に反映されます。たとえば、034B は 034B-ET、034B-ETM、034B-LC、034B-LQ、および 034B-QD として提供されています。
その他のすべてのケーブル終端オプション (利用可能な場合) は、センサ製品ページの注文情報エリアの「ケーブル終端オプション」の下にリストされています。たとえば、034B-L 風力発電セットは、034B-L 製品ページの注文情報エリアに示されているように、–CWS、–PT、および –PW オプションで提供されています。
注意: 新しい製品が在庫に追加されると、通常は複数のモデル番号を作成するのではなく、1 つのセンサモデルの下に複数のケーブル終端オプションをリストします。たとえば、HC2S3-L には、HC2S3-LC モデルではなく、CS110 に接続するための –C ケーブル終端オプションがあります。
Most Campbell Scientific sensors are available as an –L, which indicates a user-specified cable length. If a sensor is listed as an –LX model (where “X” is some other character), that sensor’s cable has a user-specified length, but it terminates with a specific connector for a unique system:
If a sensor does not have an –L or other –LX designation after the main model number, the sensor has a set cable length. The cable length is listed at the end of the Description field in the product’s Ordering information. For example, the 034B-ET model has a description of “Met One Wind Set for ET Station, 67 inch Cable.” Products with a set cable length terminate, as a default, with pigtails.
If a cable terminates with a special connector for a unique system, the end of the model number designates which system. For example, the 034B-ET model designates the sensor as a 034B for an ET107 system.
The thermistor is located approximately 3 mm (0.125 in.) back from the probe tip.
これらのセンサーを購入すると、次の校正サービスが提供されます: TEMPCAL および TEMPCAL2。
これらの両方のサービスでは、購入時に購入者が要求した場合、異なる値で校正を行うことができます。また、これらの校正サービスは両方とも、センサーの購入後に返品承認 (RMA) 番号を使用して要求できます。RMA 番号を要求するには、Repair and Calibrationページを参照してください。
The sensor/probe consists of a non-linear thermistor configured with a precision resistor in a half-bridge circuit, as shown in the product’s manual:
To measure the sensor/probe, the measurement device has to provide a precision excitation voltage (Campbell Scientific data loggers use 2000 mV), measure the voltage across the precision resistor, determine the thermistor resistance (Ohm's law), and convert the resistance to temperature using the Steinhart-Hart equation.
The Steinhart-Hart equation is 1/T = A + Bln(R) + C(ln(R))3 where:
For the 107-L, 107-LC, 108-L, and 108-LC, the following are the coefficients for the Steinhart-Hart equation:
For the 109-L, the following are the coefficients for the Steinhart-Hart equation:
キャリブレーションとフィールド チェックの違いに注意してください。キャリブレーションは、経験豊富な技術者と特殊な機器が必要なため、現場では実行できません。
測定のフィールド チェックは、データが実際の状況に合っているかどうかを判断するために実行できます。センサをフィールド チェックするには、次の手順に従います。
Many Campbell Scientific sensors are available with different cable termination options. These options include the following:
Note: The availability of cable termination options varies by sensor. For example, sensors may have none, two, or several options to choose from. If a desired option is not listed for a specific sensor, contact Campbell Scientific for assistance.
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