Watermark sensors can experience problems where the readings suddenly jump up to 200 cbar (kPa) and flatline, as shown in this screen capture:
screenshot: 2 already very dry watermark sensors flatline at 200 cbar, Basil, Bakersfield, CA
This can be caused by three reasons:
- Watermark sensors losing good contact with the soil
- Water has corroded the wires in the scotchlok
- There is no/not enough contact between the wildeye wires and the watermark
Watermark sensors losing good contact with the soil
Water has corroded the wires in the scotchlok
If the scotchloks experience flooding in which the scotchloks are submerged under water for a duration of time, the wires can corrod which prevents electrical contact. Easiest way to remedy this is by cutting back the wire and attaching a new scotchlok.
There is no/not enough contact between the wildeye and the watermark
Check the connection at the end of the wildeye or expander to check that there is a watermark. If the wildeye is not attached to a watermark sensor the wildeye will report this as 200 kPa.