内部的信号放大器提升信号，减少干扰
概览
CSIM11测量液体的全pH量程。可以浸入到水体中，或插入到水箱、水管和开放水渠中。CSIM11倾向于非高压式水体，不适合大于 30 psi的应用。请联系Campbell Scientific寻求适合于高压水管pH监测的探头的建议。
优势与特点
- Internal amplifier boosts the signal, decreasing signal interference
- Titanium ground rod runs inside the outer body to eliminate ground loop errors
- Compatible with most Campbell Scientific data loggers
- Porous polytetrafluoroethylene (PTFE) liquid junction is less susceptible to clogging as compared to conventional reference junctions
- Plunger-style pH glass electrode allowing the probe to be mounted at any angle
图像
相似产品
技术说明
CSIM11含有一个柱塞式的pH玻璃电极，可以让CSIM11以任意角度固定。相对于传统的参考接合点，CSIM11多孔的Teflon®液体接合点不太容易被阻塞。
在PPS材质外包裹体内部运行的钛接地棒消除了接地环路误差。内部放大器增加信号，减少信号干扰。放大器由内部的两节锂电池供电，因而不需要从数据采集器获取任何电源。锂电池设计可以支撑探头的整个使用寿命。
最优化参考溶液和琉璃泡的配置以适合于自然水体应用。可订购额外的参考溶液和琉璃泡的配置。请联系Campbell Scientific查询价格信息和可用性。
请注意： CSIM11采用玻璃泡技术，探头的预期寿命大约为6个月到2年，依赖于水体条件而不同。
产品规格
| pH Range | 0 to 14 |
| Zero Potential | 7.0 pH ±0.2 pH |
| Sodium Error | < 0.05 pH (in 0.1 Molar Na+ ion at 12.8 pH) |
| Output | ±59 mV/pH unit |
| Pressure Range | 0 to 30 psig |
| Accuracy | ±0.1% (over full range) |
| Impedance | < 1 Mohm (@ 25°C) |
| Reference Cell | Single Junction KCl/AgCl |
| Body Material | ABS |
| Wetted Materials | ABS, polytetrafluoroethylene (PTFE), Viton, glass, titanium |
| Cable Jacket Material | Polyurethane |
| Response Time | 95% of reading (in 10 s) |
| Drift | < 2 mV per week |
| Internal Lithium Battery Lifetime | 5 y (life of probe) |
| Diameter | 3.0 cm (1.2 in.) |
| Length | 17.8 cm (7.0 in.) |
| Weight | 0.5 kg (1 lb) with 4.57-m (15-ft) cable |
兼容性
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
数据采集器
| Product | Compatible | Note |
|---|---|---|
| CR1000X (retired) | ||
| CR300 (retired) | ||
| CR3000 (retired) | ||
| CR310 | ||
| CR350 | ||
| CR6 | ||
| CR800 (retired) | ||
| CR850 (retired) |
Additional Compatibility Information
Data Logger Considerations
The CSIM11 requires a differential analog input channel.
相关技术文档
常见问题解答
CSIM11-L: 5
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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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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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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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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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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.