CS616 Reflectómetro contenido agua en suelo (pulsos)

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1. I have a CS615 water content reflectometer. I would like to cut the rods so that it will fit in my container. Can I do that?

   If the CS615 rod length is reduced, the response of the probe to water content will change, and the recommended calibration is no longer valid. Additionally, reducing rod length will adversely affect the water content measurement resolution. However, the CS615 will respond in a similar manner to the response with standard length rods (30 cm). The response needs to be described for the modified probe to generate a calibration. CS615 water content resolution is better than 0.2% volumetric water content with 30 cm rods. If the rods are cut by 15 cm, water content resolution will be between 1% and 2%. A few additional points are:

   • Probes with rods less than 15 cm may be unstable.
   • A calibration of CS615 output to volumetric water content will have to be established using field or laboratory measurements. Field calibration measurements can be made by recording the CS615 period with the probe in soil, removing the probe and taking samples of known volume for use with gravimetric water contents.
   • Water content measurement resolution will be affected.
   • Cutting the rods will void their warranty.
2. Why does the CS616 not work with the 21X?

   The CS616 has a faster period output than the CS615-L, so it does not work with the 21X dataloggers.

3. Can the CS616 or CS625 be used in frozen, shallow soil conditions?

   The CS616/CS625 will survive frozen soil conditions, but the principle behind using bulk soil dielectric permittivity to estimate water content requires that the water be in liquid form. When soil water freezes, its dielectric drops from approximately 80 to 4, making it indistinguishable from soil solids. Consequently, the CS616/CS625 is not able to measure the water content of frozen soil.

4. Can the cable of the CS650, CS655, CS616, or CS625 be spliced?

   Campbell Scientific does not recommend splicing sensor cables. Sensors may be ordered with custom cable lengths, and Campbell Scientific recommends purchasing the correct length for the application. If the sensor cable needs to be lengthened, a junction box (if practical) is a more favorable option than a splice.

   Note: A splice will void the sensor warranty, but a junction box does not modify the sensor and therefore does not void the warranty.

5. What soil moisture range can be measured with the CS616 or CS625?

   The CS616/CS625 can measure volumetric water content over the entire range from completely dry to saturation. A soil-specific calibration will improve accuracy, especially in very dry soil.

6. Can the CS616 or CS625 be used with soil that has a high salt content?

   If a soil-specific calibration is performed, the CS616/CS625 may be used in soil with a maximum bulk electrical conductivity of 5 dS/m.

7. Do the CS616 and CS625 work correctly in soil that has a lot of fine roots?

   Fine roots do not significantly affect the CS616/CS625 reading.

8. How can the cable for the CS650, CS655, CS616, or CS625 be protected from damage?

   Running the cable through electrical conduit or PVC pipe will protect the cable from rodents. A trench 30 to 60 cm deep will protect it from most other human or animal activity. Some customers have found that extra cable can be coiled and left inside a box, such as an irrigation valve box or something similar. When using a box, seal any holes that are large enough for rodents to enter. When cables are exposed on the ground surface, some customers have found that wrapping the cables in the metal screening used for screen doors discourages animals from chewing on them.  

9. Can a CS616 or CS625 be used at a peat swamp where water levels remain near the surface?

   Yes, but the CS616/CS625 will need a soil-specific calibration. The high organic matter content of peat will likely cause the CS616/CS625 period to be out of bounds for use with the CS616() CRBasic instruction and P138 Edlog instruction. In that situation, the CRBasic PeriodAvg() instructionor the Edlog P27 Period Average instruction may be used as described in the CS616 and CS625 instruction manual.

10. Are the CS616 and CS625 waterproof? For example, can they withstand being covered with water, sand, and soil?

    Yes. The rugged design of the CS616/CS625 protects the probe electronics from water under these conditions. Many CS616/CS625 reflectometers have been working reliably in very wet conditions for more than ten years.