内部アンプが信号を増幅し、干渉を低減
概要
Wedgewood Analytical 社製の CSIM11 は、液体の全 pH 範囲を測定します。水中に沈めたり、タンク、パイプライン、オープン チャネルに挿入したりできます。CSIM11 は非加圧システム用であり、30 psi を超える用途向けには設計されていません。加圧パイプへの設置に適したプローブの推奨事項については、Campbell Scientific にお問い合わせください。
続きを読む利点と特徴
- 内部アンプが信号を増幅し、信号の干渉を低減
- グランドループエラーを排除するため、チタン製グランドロッドを外装の内側に配置
- ほとんどのCampbell Scientificデータロガーと互換性あり
- 多孔質ポリテトラフルオロエチレン（PTFE）液体ジャンクションは、従来の基準ジャンクションに比べて目詰まりしにくい
- プランジャータイプのpHガラス電極により、プローブをどの角度でも取り付け可能
イメージ
詳細
注意: CSIM11 はガラス電球技術を使用しており、水の状態に応じて寿命は約 6 か月から 2 年です。
仕様
| pH レンジ | 0 ~ 14 |
| ゼロポテンシャル | 7.0 pH ±0.2 pH |
| ナトリウムエラー | < 0.05 pH (＠pH 12.8、0.1 モル Na+ イオン中) |
| 出力 | ±59 mV/pH |
| 動作温度範囲 | 0° ~ 80°C |
| 圧力範囲 | 0 ~ 30 psig |
| 正確度 | ±0.1% (フルレンジ) |
| インピーダンス | < 1 Mohm (@ 25°C) |
| リファレンスセル | シングルジャンクション KCl/AgCl |
| ボディ素材 | ABS |
| 浸漬部材質 | ABS、ポリテトラフルオロエチレン（PTFE）、バイトン、ガラス、チタン |
| ケーブルジャケット材質 | ポリウレタン |
| 応答時間 | 読み取り値の95% （10秒以内） |
| ドリフト | < 2 mV /週 |
| 内蔵リチウム電池の寿命 | 5 年 （プローブの寿命） |
| 直径 | 3.0 cm (1.2 in.) |
| 長さ | 17.8 cm (7.0 in.) |
| 重さ | 0.5 kg (1 lb) 4.57m (15-ft) ケーブル付き |
ドキュメント
カタログ
よくある質問
CSIM11-Lに関するよくある質問の数： 8
すべて展開すべて折りたたむ
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Cleaning and/or calibration may be required when the measurements are scattered, drifting occurs, or there is physical evidence of fouling. Measurements for pH must be monitored regularly to check for scattering. However, just because the results are scattered does not necessarily indicate the need for an adjustment. For example, there may be a change in the water source that causes the scattering. As a sensor ages, however, the scattering of the measured values tends to increase.
To check the performance of a pH sensor, use it to measure a buffer solution in the correct range. If the value returned is within the specified range, the sensor does not need to be calibrated.
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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。
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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:
- An –LC model has a user-specified cable length for connection to an ET107, CS110, or retired Metdata1.
- An –LQ model has a user-specified cable length for connection to a RAWS-P weather station.
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.
- –ET models terminate with the connector for an ET107 weather station.
- –ETM models terminate with the connector for an ET107 weather station, but they also include a special system mounting, which is often convenient when purchasing a replacement part.
- –QD models terminate with the connector for a RAWS-F Quick Deployment Station.
- –PW models terminate with the connector for a PWENC or pre-wired system.
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Many Campbell Scientific sensors are available with different cable termination options. These options include the following:
- The –PT (–PT w/Tinned Wires) option is the default option and does not display on the product line as the other options do. The cable terminates in pigtails that connect directly to a data logger.
- In the –C (–C w/ET/CS110 Connector) option, the cable terminates in a connector that attaches to a CS110 Electric Field Meter or an ET-series weather station.
- In the –CWS (–CWS w/CWS900 Connector) option, the cable terminates in a connector that attaches to a CWS900-series interface. Connection to a CWS900-series interface allows the sensor to be used in a wireless sensor network.
- In the –PW (–PW w/Pre-Wire Connector) option, the cable terminates in a connector that attaches to a prewired enclosure.
- In the –RQ (–RQ w/RAWS Connector) option, the cable terminates in a connector that attaches to a RAWS-P Permanent Remote Automated Weather Station.
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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The recommended calibration method listed in a specific pH sensor’s instruction manual should be followed to guarantee the best results. Calibration must be performed correctly to ensure accurate and repeatable measurements. Before performing calibration, the pH sensor should be cleaned.
Calibration is commonly done using a known-value pH solution called a buffer. The buffer solution is formulated to resist pH changes caused by external contaminants. However, the pH of the buffer solution changes as the temperature changes. To compensate for this, manufacturers list the pH of the buffer solution at various temperatures on the buffer solution’s bottle so that the correct value for calibration is selected.
The most common calibration method is a two-point calibration using two buffer solutions. Each buffer solution has known and accurate pH values at different temperatures. The buffers used should be based on the normal measurement range that the pH sensor operates in for the application. One buffer solution should have a 7.0 pH. The second buffer solution should have a pH that is near the expected pH value of the sample solution.
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A reference electrode can become contaminated when poisoning ions such as lead, iron, chrome, cyanide, or sulfide enter the reference electrode and react either with the silver wire or with the electrolyte solution.
The contamination may not become apparent until the silver-chloride coating is completely dissolved and the electrical potential from the reference electrode has changed greatly. If this occurs, the reference electrode must be replaced.
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Silver is the best electrical conductor of all the metals because it has the lowest electrical resistance. The silver wire, coated in silver chloride, is relatively insensitive to changes in temperature.
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In the event that both alkaline and acidic sample solutions are measured using a single pH sensor, a multipoint calibration is done using three buffer solutions. As in the two-point calibration, the first buffer solution has a 7.0 pH. The second buffer solution should be near in pH value to either the acidic or alkaline sample solution, and the third buffer solution should be near in pH value to the other.
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