Campbell SAT ARGOS Bedienungsanleitung PDF herunterladen (Seite 320)

ZENO

-3200 USER MANUAL

Coastal Environmental Systems (206) 682-6048 Page D-16

2.6. Rainfall Process

Inputs: 4 Rain Data

5 Rain accumulation interval, 0 to 24 hours

6 Rain accumulation offset, 0 to 24 hours

7 Rain Sensor Type

1 Tipping bucket

2 R.M. Young sensor

3 Optical rain rate

8 Rain End Reset Delay

Outputs: 1 Rain accumulation over accumulation interval

2 Average hourly rain rate in accumulation per hour

3 Rain accumulation over the sample interval

4 Rain Indication (0 = not raining, 1 = raining)

L1 Rain Start Time (seconds after midnight, 1/1/1970)

L2 Rain End Time (seconds after midnight, 1/1/1970)

E1 Process Error Code

Assumptions: The accumulation interval and offset should be defined in hours.

The rain data input must be a sensor, not a process, and the sensor must

be configured with its Maximum Sensor Readings value set to 0 (the

default).

This process first determines the input sensor type, defined in Line Item #7, to properly interpret the

measured rain sensor data from Line Item #4:

 Tipping bucket sensors yield discrete quantities of rain.

 R.M. Young rain sensors show a current accumulation from 0 to 50 mm.

 Optical rain sensors show the current rain rate in mm/hr.

ZENOSOFT® converts the measured rain sensor data from the R.M. Young or optical rain sensor into a

quantity of rainfall that is similar to that reported by a tipping bucket sensor.

The measured quantity of rain is added to two independent accumulation values:

 A long-term rain accumulation interval, data output #1, that is user-defined and independent of the

Sample Interval.

 A rain accumulation interval, whose length of time is equivalent to the Sample Interval, data output

#3.

The long-term rain accumulation interval is defined by Line Items #5 and #6. The Rain Accumulation

Offset parameter in Line Item #6 defines the offset from midnight that the Rain Accumulation Interval

from Line Item #5 begins. The long-term rain accumulation value is reset to zero at the beginning of each

Rain Accumulation Interval. As an example, a Rain Accumulation Interval of 24 hours with a Rain

Accumulation Offset of 9 hours would mean that every morning at 9:00 a.m. the long-term rain

accumulation value is reset.

A running rain accumulation value can be calculated if the following steps are used:

 Divide the desired time interval for the running rain accumulation value by the Sample Interval

Time

335

to obtain the number of required running intervals.

335

Refer to Section 3.1.3.

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