适用于各种领域
概览
109温度探头，坚固耐用，精确测量-50°C至70°C范围内的空气、土壤或水体的温度。专为 Campbell Scientific的数据采集器设计，用于多个领域。
优势与特点
- Versatile product—measures air, soil, or water temperature
- Wide temperature measurement range
- Compatible with most Campbell Scientific data loggers
- Easy to install or remove
- Durable
图像
技术说明
109温度探头包含一个封装在环氧树脂填充的铝外壳的热敏电阻。坚固耐用，精确测量-40°C至70°C范围内的土壤或水体的温度。铝外壳保护热敏电阻使其可以插入到土壤或浸入水体中。
109可输出2至2.2V的信号，使用CR200X系列数据采集器可检测到该信号
产品规格
| Output | Analog |
| Operating Temperature Range | -50° to +70°C |
| Sensor Description | Measurement Specialties™ 10K3A1iA Thermistor |
| Tolerance | ±0.2°C (over 0° to 70°C range) |
| Temperature Measurement Range | -50° to +70°C |
| Steinhart-Hart Equation Error | ≤ 0.03°C (-50° to +70°C) |
| Interchangeability Error | ±0.1°C (over 0° to 70°C range increasing to ±0.5°C at -50°C) |
| Time Constant in Air | 30 to 60 s (in a wind speed of 5 m s-1) |
| Maximum Submergence | 15 m (50 ft) |
| Maximum Cable Length | 305 m (1000 ft) |
| Probe Length | 10.4 cm (4.1 in.) |
| Probe Diameter | 0.76 cm (0.3 in.) |
| Weight | 136 g (5 oz) with 3.05-m (10-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 |
|---|---|---|
| CR300 (retired) | ||
| CR3000 (retired) | ||
| CR310 | ||
| CR350 | ||
| CR6 | ||
| CR800 (retired) | ||
| CR850 (retired) |
Additional Compatibility Information
数据采集器考虑
109 特别设计用于我们的 CR200(X)/CR300系列数据采集器。同时也适用于其它的数据采集器。
可兼容的当代数据采集器
| CR200(X) 系列 | CR800/CR850 | CR1000 | CR3000 | CR7X | CR9000X | CR6 |
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可支持的已停产数据采集器
| CR500 | CR510 | CR10 | CR10X | 21X | CR23X | CR5000 | CR9000 |
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安装考虑
空气温度
为避免太阳辐射增温效应，109 必须被固定在防辐射罩肉。一般使用 41303-5A 6-页自然通风防辐射罩。109 也可以被固定在 41003-5 10-页防辐射罩，如果使用 41322 适配板。防辐射罩可以被固定到主桅杆上、直立塔的立柱上或横臂上。
土壤温度
109 适合浅层埋藏。在长距离时建议使用结实的穿线管来保护线缆，特别是那些位置可能有挖掘、割草、通信，或使用电动工具，或有雷击危险时。
水温
109 探头可以浸入水下至 50 英尺。请注意探头很轻；因此，安装者应当考虑增加配重，或把探头紧固到水下的物体，例如桩上。
常见问题解答
109: 4
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The thermistor is located approximately 3 mm (0.125 in.) back from the probe tip.
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When these sensors are purchased, the following calibration services are offered: TEMPCAL and TEMPCAL2.
- TEMPCAL provides a single-point calibration and a calibration certificate. The single-point calibration determines the offset at 25°C with an uncertainty of ±0.05°C.
- TEMPCAL2 provides a two-point calibration and a calibration certificate. The two-point calibration determines offsets at 30°C and 65°C with an uncertainty of ±0.05°C.
For both of these services, calibration can be made at different values if it is requested by the purchaser at the time of purchase. In addition, both of these calibration services can be requested after sensor purchase using a return material authorization (RMA) number. To request an RMA number, refer to the Repair and Calibration page.
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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:
- Model 107 Temperature Probe Instruction Manual
- Model 108 Temperature Probe Instruction Manual
- 108-LC Temperature Probe for MetData1 Instruction Manual
- Model 109 Temperature Probe Instruction 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:
- T is the temperature in Kelvin
- R is the resistance at T in ohms
- A, B, and C are the Steinhart-Hart coefficients, which vary depending on the temperature range of interest, as well as the type and model of the thermistor
For the 107-L, 107-LC, 108-L, and 108-LC, the following are the coefficients for the Steinhart-Hart equation:
- A = 8.271111E-4
- B = 2.088020E-4
- C = 8.059200E-8
For the 109-L, the following are the coefficients for the Steinhart-Hart equation:
- A = 1.129241E-3
- B = 2.341077E-4
- C = 8.775468E-8
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Note the difference between calibration and a field check. Calibration cannot be done in the field, as it requires an experienced technician and specialized equipment.
Field checks of measurements can be done to determine if the data make sense with the real-world conditions. Follow these steps to field check a sensor:
- Find a second sensor of the same type as the installed sensor whose data is in question. The second sensor will be used as a benchmark sensor and should be known to be accurate or recently calibrated.
- At the site, take readings using both sensors under the same conditions. The best practice is to measure both sensors side-by-side at the same time. Note that the sensors will never have the exact same measurement.
- Depending on the sensor model, if the difference in the readings of the installed and benchmark sensors is greater than the sum of the accuracies for both sensors, either return the installed sensor to Campbell Scientific for calibration or replace the appropriate chip.
- The 107, 108, 109, 110PV-L, and BlackGlobe-L temperature sensors can be calibrated.
- The HC2S3-L and HMP155A-L temperature and relative humidity sensors can be calibrated.
- The CS215-L has a replaceable chip for temperature and relative humidity. For more information, refer to the “Maintenance and Calibration” section of the CS215 instruction manual.
- The HMP60-L has a replaceable chip for relative humidity only. For more information, refer to the “Maintenance” section of the HMP60 instruction manual.
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