In northern Ghana last month, our HOBO U20s drifted 3–5 cm after 45°C afternoons, while an off-the-shelf ultrasonic spooked cattle and was pulled down, so I’m rethinking what “robust” means when customs, community acceptance, and maintenance skills drive success as much as specs. Has anyone landed on a pressure or radar setup that travels well across borders, is calibratable with simple gear, and fits local norms (e.g., under-bridge mounts, vented tubing protection) without creating a maintenance burden?
on a pressure or radar setup that travels well across borders, is calibratable with simple gear, and fits local Swapped our U20s for a vented gauge in a white PVC standpipe; in 45°C the drift fell under 1 cm, cattle ignore the low profile, and we zero at sunrise to a staff with a quick clear-hose two-point check; declare it “water depth transducer, no radio” and it’s cleared customs reliably…
Short answer from my side: I’m seeing the same pattern — one concrete thing that helped was writing down the exact handoff and timebox it to 15–20 min. Does that match what you’re running into?
A vented 4–20 mA pressure probe sleeved inside 1" EMT conduit, bolted to a T‑post and capped in a small welded cage cut our hot‑afternoon drift to about 0.5 cm and kept cows from yanking anything (cow‑proof beats spec‑sheet). We set a staff and do a “bucket + staff” two‑point at install, then spot‑check against the staff after heat spikes. Caveat: keep the vent tube dry with fresh desiccant each visit; if customs frown at “sensors,” call it a “well switch” and carry a generic datasheet like https://keller-druck.com/en/products/pressure-sensors/level-probes/series-36xw.