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10.3.2
Measure Type: Precip Accumulation and Precip Rate
Connection: Terminal #12 TB/DIN#2 and Terminal #11 Ground
Precip Accumulation and Precip Rate are designed to measure the pulses from a tipping bucket type rain
gauge.
Precipitation accumulation is used to tally the total amount of precipitation since the station has powered
up. Count must be set to zero by the user when the station is installed. Counts persist between power-ups.
Precipitation rate, unlike precipitation accumulation, measures the precipitation that has occurred since
the last measurement. So, if the measurement interval is 15 minutes, this measurement will report the
rainfall in the last 15 minutes only.
Multiple measurements can be set up with the same input. For example, if you wanted to know the daily
rainfall and the rainfall during the last hour, set up two measurements: one a
Precip Rate
with an interval
of one hour, and another as
Precip Rate
with an interval of one day.
Usually, a slope is applied to convert the counts from the tipping bucket into inches of rain. For example,
setting the
Slope
to 0.01 means that each tip of the bucket is 0.01”.
Precip readings are de-bounced for 4ms.
Notes on Precip Rate
Precipitation rate is computed as the current count minus the count at the last scheduled measurement.
The first scheduled reading of precipitation rate is invalid, as it takes two readings before the
difference can be computed.
When the system is not running, it is not able to make sensible Precip Rate readings.
Forced (live) precipitation rate readings are unreliable. The rate will be computed over the
currently elapsed time and extrapolated over the rest of the interval.
Precip Accumulation Reset
XLink may be setup to automatically reset precip accumulation.
Precip Accumulation Reset may only be performed on a tipping bucket connected to TB/DIG IN 2.
When the station is setup for Precip Accumulation, it may also be setup to automatically reset the
accumulation at a specific time.
The Accumulation Reset options are
Off (default)
Daily
Monthly
Yearly
When Accumulation Reset is active, additional settings are used to tell when to reset accumulation:
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