Purchased the Ecowitt HP2553 which includes the WH40 I believe. Since installation there have been 6 rain events and the WH40 under reported 4 times - approx. 1/3 of local - 5km - international airport. (that is WH40 4.6mm, airport 15mm) Other PWS in area reported similar values as the airport. The WH40 is 120cm off the ground 5-6m clear of any buildings / trees.
As suggested in the manual I have caught the rain exiting the WH40 and measured it. In all cases of suspected under report, the rain exiting has been more that what was recorded according to calibration formula in the manual.
I've been in conversation with support (Lucy) and very helpful, but no solution. I was told by Ecowitt that the WH40 will only count max 50 tips in single reporting period of 49 sec.
Since the rain events that resulted in under reporting were heavier (not talking flash flood level, but 20 min drenching) I believe that the design will incorrectly report during rain events exceeding 6-8 mm/hr. Example if 51 tips occur in 49 sec, only 1 tip is reported. According to Ecowitt 50 tips in 49 secs = 8mm/hr.
I am very surprised that a WH40 would be this poorly designed so I'm sure something else must be wrong. However Ecowitt support has no remedy.
Am I missing something, or is the WH40 really that poorly designed?