I had to calibrate my old system with a known about of water in my plastic rain gauge. I found that it was about 15% lower than the known amount. I had to experiment with the two screws under each tipping bucket to get the correct volume. I don't know how Davis calibrates their rain gauges. Perhaps they can provide additional information.
You can't really calibrate it this way, Phil, though it seems logical. It has to do with volume of the collection device. An inch of water in a swimming pool is lot more actual amount than an inch in your collector. We factory-calibrate and are always super proud of our excellent accuracy specs!
@@davisinstruments Interesting. My manual and Davis observations are within 0.01" now. I think my method has validity. I have been taking observations for 60 years.
I recently replaced my old tipping buckets with this new design. However it seems to be underreporting the rainfall. By nearly half, when compared to other Vantage Pro stations in my area. I've checked to make sure the collection cone is clear, and that the station is level. Has anyone else experienced this issue?
It's really very hard to make comparisons on rain because it varies so much even by a few feet. But by half does seem suspicious. Can you contact our Tech Support team -- they can figure it out! (510) 732-7814, M- F, 7:00 am to 5:30 pm PST; or support@davisinstruments.com
@@davisinstruments Ok so the previous one was inaccurate at high rates? Seems counterintuitive because the second spoon can collect rain while the full spoon empties. Anyway, I consistently find that the old mechanism under reports rain by 10-20% compared to Cocorahs and Vantage Vue. I installed a Pro with a new spoon and it seems to work much better. Just ordered an updated one for an old Pro. It comes tomorrow and I will report back my results.
@@MisterTwister55 Are you satisfied with this update? What was the results? I am interested to know if it is really a wise move to change the old Davis rain gauge
@@DragonFM Over a year of testing and the new mechanism is within 1-2% of the manual gauge less than 6 inches away. Previously the Davis would under report up to 10% of rainfall totals.
Darkos, you can't calibrate with water pouring through because it is volume is part of the formula. One ml in a pipette might be an inch, but one ml in a swimming pool... They are factory calibrated - if you are concerned, please call tech support. (510) 732-7814, M- F, 7:00 am to 5:30 pm PST; or support@davisinstruments.com.
I have three rain gauges and they all overestimate by up to 8 or even 10% compared to the reference manual rain gauge (SPIEA) with each moderate to heavy rain. I tried calibrating the screw and that did not correct the problem. Based on reports, this does not seem to be an isolated problem. Improve the quality and especially the stability of your rain gauges because they overestimate far too much...
Thanks for this update. I just ordered one for my Davis Vantage Pro2 station.
Just for you, Georgia!
@@davisinstruments and, Merry Christmas!
Do the new vantage pro2 come with this upgrade already?
I had to calibrate my old system with a known about of water in my plastic rain gauge. I found that it was about 15% lower than the known amount. I had to experiment with the two screws under each tipping bucket to get the correct volume. I don't know how Davis calibrates their rain gauges. Perhaps they can provide additional information.
You can't really calibrate it this way, Phil, though it seems logical. It has to do with volume of the collection device. An inch of water in a swimming pool is lot more actual amount than an inch in your collector. We factory-calibrate and are always super proud of our excellent accuracy specs!
@@davisinstruments Interesting. My manual and Davis observations are within 0.01" now. I think my method has validity. I have been taking observations for 60 years.
I recently replaced my old tipping buckets with this new design. However it seems to be underreporting the rainfall. By nearly half, when compared to other Vantage Pro stations in my area. I've checked to make sure the collection cone is clear, and that the station is level. Has anyone else experienced this issue?
It's really very hard to make comparisons on rain because it varies so much even by a few feet. But by half does seem suspicious. Can you contact our Tech Support team -- they can figure it out! (510) 732-7814, M- F, 7:00 am to 5:30 pm PST; or support@davisinstruments.com
Mine arrived yesterday and aiming to fit it today, when the rain finally stops ! I presume the plastic cable tie across the bucket is removed ?
Hi Steve! Yes it's shipped with a cable tie securing it. Cut the cable tie -- NOT the black sensor cable!
got mine on Christmas eve and love a lot better than the old one.THANKS DAVIS.
You must have been a good boy this year, Wally.
Am never a good boy but Santa thonks I am
What's the reason for the change? What was inaccurate about the last one?
It was not inaccurate, but this one extends the accuracy range to higher rain rates.
@@davisinstruments Ok so the previous one was inaccurate at high rates? Seems counterintuitive because the second spoon can collect rain while the full spoon empties. Anyway, I consistently find that the old mechanism under reports rain by 10-20% compared to Cocorahs and Vantage Vue. I installed a Pro with a new spoon and it seems to work much better. Just ordered an updated one for an old Pro. It comes tomorrow and I will report back my results.
@@MisterTwister55
Are you satisfied with this update? What was the results? I am interested to know if it is really a wise move to change the old Davis rain gauge
@@DragonFM Over a year of testing and the new mechanism is within 1-2% of the manual gauge less than 6 inches away. Previously the Davis would under report up to 10% of rainfall totals.
@@MisterTwister55 Thanks for the reply.
!!
Hi. how many ml do I need for check the calibration in this new spoon?
Darkos, you can't calibrate with water pouring through because it is volume is part of the formula. One ml in a pipette might be an inch, but one ml in a swimming pool... They are factory calibrated - if you are concerned, please call tech support. (510) 732-7814, M- F, 7:00 am to 5:30 pm PST; or support@davisinstruments.com.
@@davisinstruments,,, strange answer
I have three rain gauges and they all overestimate by up to 8 or even 10% compared to the reference manual rain gauge (SPIEA) with each moderate to heavy rain.
I tried calibrating the screw and that did not correct the problem.
Based on reports, this does not seem to be an isolated problem.
Improve the quality and especially the stability of your rain gauges because they overestimate far too much...