环氧树脂封装，经久耐用，易于清洁
概览
CS547A 探头测量电导率（EC）和温度。通过A547接口连接到Campbell Scientific数据采集器，兼容我们大多数的数据采集器。
优势与特点
- Compatible with most Campbell Scientific data loggers
- Easy to clean
- Corrosion resistant
- Rounded ends facilitate installation and removal
- Compatible with AM16/32-series multiplexers allowing measurement of multiple sensors
- Weighted option available for stand-alone submersion
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技术说明
CS547A通过热敏电阻测量温度；通过固定在环氧树脂外壳上的3个柱状不锈钢电极来测量电导率（EC）。不锈钢电极的配置方式消除了接地环路的问题，即当传感器与大地有电路上的连接时产生的问题。电极为交流耦合，数据采集器施以双极性的激发，这个过程减小了电化学反应，最小化了腐蚀效果，因而延长了探头的使用寿命。
CS547A易于清洁，耐腐蚀。探头前端为圆头形状，易于安装与移除。发运的CS547A经过 0.01 摩尔的 KCl溶液在 25°C环境下的校准；该标准液的电导率为 1.408 mS cm-1。
产品规格
| Output | Analog (requires A547 interface) |
| Conductivity Measurement Range | ~0.005 to 7 mS/cm |
| Temperature Measurement Range | 0° to 50°C |
| Conductivity Accuracy |
|
| Temperature Polynomial Linearization Error | Typically < 0.1°C (over 0° to 48°C) |
| Thermistor Interchangeability | Typically < 0.2°C (over 0° to 50°C) |
| Wetted Materials | Epoxy housing, 316 stainless-steel rings, polyurethane cable |
| pH Operating Range | Solution pH of less than 3.0 or greater than 9.0 may damage the stainless-steel housing. |
| Operating Temperature Range | 0° to 50°C |
| Depth Rating | 305 m (1000 ft) maximum |
| Dimensions | 8.9 x 2.54 x 1.9 cm (3.5 x 1 x 0.75 in) |
| Weight |
|
| Weighted Cable Weight | 80 g (2.8 oz) |
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 | ||
| CR300 | ||
| CR3000 (retired) | ||
| CR310 | ||
| CR350 | ||
| CR6 | ||
| CR800 (retired) | ||
| CR850 (retired) |
Additional Compatibility Information
The minimum pipe ID that the CS547A-L fits is 2.79 cm (1.1 in.).
Data Logger Considerations
The A547 Interface is required for connecting the probe to the data logger. This interface contains the blocking capacitors and bridge completion resistors necessary for the conductivity measurement.
A 3-ft cable is shipped with the sensor to connect the A547 to the data logger terminals. The CS547A requires one differential analog input, one single-ended analog input, and two excitation channels. One excitation channel must be capable of delivering ac excitation, so the BDR301 or BDR320 are NOT compatible.
Using Multiple CS547A Conductivity Probes
Special considerations apply when two or more CS547A probes will be measured by a single data logger.
A CR510 cannot be used to measure two probes because it does not provide sufficient (three) excitation channels.
Although it is acceptable for the two thermistors to share an excitation channel, each conductivity measurement requires a dedicated excitation channel. If excitation for the conductivity measurement were to be shared from a common excitation channel, both solutions would become polarized and once excitation was removed, some charge could be transferred from one solution to the other making the measurements interdependent on one another. If more than two CS547A probes are to be measured, then an AM16/32-series multiplexer is required.
Multiplexers
If more than two CS547A probes are to be measured, then an AM16/32-series multiplexer is required. In this scenario, each probe is wired to the multiplexer and one A547 interface is wired between the multiplexer and the data logger. If the system were maximized, up to sixteen CS547As could be connected to the multiplexer. However, because the A547 becomes a part of the measurement circuit for all connections to the multiplexer, only CS547A probes could be connected to the multiplexer (i.e., it is not possible to mix other sensor types with the CS547As attached to the multiplexer).
下载
CS547a Program Examples for CR1000X and CR1000 Data Loggers v.1 (7 KB) 24-02-2022
Four programs are included: two CR1000X programs and two CR1000 programs. The first CR1000X and CR1000 programs measure the sensor and correct for cable resistance, EC ionization, and temperature. These programs use constants for KC (printed on the sensor label), cable length, and temperature coefficient (see manual). These values should be changed to fit your sensor. Also included are a CR1000X and a CR1000 program for calibrating the sensor. Newer data loggers such as the CR6 are programmed similarly to the CR1000X. Older data loggers such as the CR800-series and CR3000 are programmed similarly to the CR1000.
常见问题解答
CS547A-L: 18
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The readings will be accurate for the sample of water inside the cavity, but that may or may not be indicative of the overall conductivity of the well. Flowing water allows a more representative measurement over time.
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Position the CS547A-L so that it is protected during high flow but remains submerged at base flow. Orient the measurement cavity parallel to the water flow.
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Ice forming inside the hollow cavity can damage the sensor; therefore, as a precaution, the sensor should be removed.
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Yes. Each CS547A-L is shipped with a pn 7785, 4-inch Nylon brush.
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This sensor is designed for freshwater applications and should not be used in seawater.
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If the measurement cavity is kept clean, ephemeral conditions should not affect the reading.
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The units of conductivity are mS/cm or millisiemens per cm.
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The CS547A-L has a built-in thermistor that is used for this purpose.
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Exciting the CS547A-L with an electrical charge to make a measurement causes ionization. The ionization correction code corrects for this disruption.