Hi, I've got a CR1000 with a MetOne 375 rain gauge which recently recorded about one inch of rainfall in a minute, three times, within about a half an hour, with no other rainfall readings, and without any actual rainfall at that time. This is the only time I've seen readings like that from this station, and I'm currious if anyone has any idea why it would have happened?
Units BattV=Volts
Units PTemp_C=Deg C
Units BP_mmHg=mmHg
Units Rain_mm=mm
Units SlrkW=kW/m^2
Units SlrMJ=MJ/m^2
Units WS_ms=meters/second
Units WindDir=degrees
Units AirTC=Deg C
Units RH=%
Units VWC=m^3/m^3
Units EC=dS/m
Units T=Deg C
Units Gflux=W/m^2
Units T_Top=Deg C
Units T_Bot=Deg C
'Define tables
DataTable(Table1,True,-1)
DataInterval(0,60,Sec,10)
Average(1,BP_mmHg,FP2,False)
Totalize(1,Rain_mm,FP2,False)
Average(1,AirTC,FP2,False)
Sample(1,RH,FP2)
Average(1,SlrkW,FP2,False)
Totalize(1,SlrMJ,IEEE4,False)
Average(1,WS_ms,FP2,False)
Sample(1,WindDir,FP2)
Average(1,VWC,FP2,False)
Average(1,EC,FP2,False)
Average(1,T,FP2,False)
Average(1,Gflux,FP2,False)
Average(1,T_Top,FP2,False)
Average(1,T_Bot,FP2,False)
Sample(1,BattV,FP2)
Sample(1,filler1,FP2)
Sample(1,filler2,FP2)
Sample(1,filler3,FP2)
Sample(1,filler4,FP2)
Sample(1,Pump,FP2)
Sample(1,Valve_open,FP2)
Sample(1,Valve_close,FP2)
Sample(1,RelayStatus,String)
EndTable
'Main Program
BeginProg
RunCheck=1
Scan(1,Sec,1,0)
'Default Datalogger Battery Voltage measurement 'BattV'
Battery(BattV)
'Default Wiring Panel Temperature measurement 'PTemp_C'
PanelTemp(PTemp_C,_60Hz)
'CS100 Barometric Pressure Sensor measurement 'BP_mmHg
PortSet(1,1)
VoltSe(BP_mmHg,1,mV2500,1,1,0,_60Hz,0.2,600)
BP_mmHg=BP_mmHg*0.75006
'Rain Gauge measurement 'Rain_mm'
PulseCount(Rain_mm,1,1,2,0,0.254,0)
'CS215 Temperature & Relative Humidity Sensor measurements 'AirTC' and 'RH'
SDI12Recorder(TRHData(),7,"0","M!",1,0)
'CS300 Pyranometer measurements 'SlrMJ' and 'SlrkW'
VoltSe(SlrkW,1,AutorangeC,3,False,0,_60Hz,1,0)
If SlrkW<0 Then SlrkW=0
SlrMJ=SlrkW*2.5E-05
SlrkW=SlrkW*0.005
'05103 Wind Speed & Direction Sensor measurements 'WS_ms' and 'WindDir'
PulseCount(WS_ms,1,2,1,1,0.098,0)
BrHalf(WindDir,1,mV2500,2,1,1,2500,True,0,_60Hz,355,0)
If WindDir>=360 OR WindDir<0 Then WindDir=0
'CS650/655 Water Content Reflectometer measurements 'VWC', 'EC', and 'T'
SDI12Recorder(CS65X(),5,"0","M!",1,0)
'hfp01 ground heat flux sensor
VoltSe(Gflux,1,mv5000,4,True,0,_60Hz,.001,0)
'both burial thermocouples
TCDiff(GTemp_C(),2,AutorangeC,5,TypeJ,PTemp_C,True,0,_60Hz,1,0)
'Relay status monitoring
VoltSe(Relay_State(),3,mv5000,14,true,0,_60Hz,.001,0)
'Call Data Tables and Store Data
CallTable(Table1)
I had a similar problem because of bad grounding on heater. The rain sensor got the 50Hz freq. as rain. after a good ground my problem solved.
Unfortunatly the heater is not powered currently, but I suppose it could be picking up noise from power somewhere. Was your problem intermittent? I would have guessed noise like that would have been more continuous?
Thanks for the reply!
Sometimes a failed reed switch can cause similar problems.
I have occasionally gotten erroneous readings from a couple of sites during high wind. (30mph and over). The tower support arms from the vendor were pretty flimsy and the tipping bucket osciallated at a frequency that rapidly flipped the rainfall indicator back and forth over the reed switch. (We now design with an ultra rigid instrument support arm.)