MRW501 Weighing Rain Gauge
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- Weight principle of
measurement
- High accuracy of measurement liquid / solid precipitation
- Data and pulse output
- Integrated storage
container enabling long-term automatic operation without operator
intervention
- Tempering space of the weighed container against dew
- Heating of the catch hole in winter operation
- Integrated data logger
- System self-diagnosis
- Acoustic and optical signaling of operational states
- Structural and software solutions to limit the influence of wind
- Simple connection using connectors
- Year-round operation
- Manual or automatic draining of the measuring vessel
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MRW501 Weighing Rain Gauge – technical specification |
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Catching area |
500 cm2 |
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Catching area diameter |
252,3 mm |
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Measurement principle |
Weighing principle |
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Range of precipitation measurement |
0,05
… ∞ mm - Automatic transfer of liquid between the upper
weighing and the lower storage vessel by pump. One-time continuous rainfall until draining is
necessary - max 120 mm. (However, practically unlimited, because at the time
of discharge, precipitation is calculated from the average intensity before
discharge.) The natural evaporation of rainwater from the lower
storage vessel is supported. The usable volume
of the lower vessel is 100 l (2000 mm of precipitation). |
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Max. measured intensity of precipitation |
For data output: practically unlimited
within real rainfall For pulse output:
30 mm/min (respective 1800 mm/hour) |
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Resolution |
Working resolution: 0,001 mm precipitation Output
resolution: 0,1 mm precipitation |
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Accuracy |
± 0,1% in the whole
range |
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Other parameters |
Weighing capacity:
0 … 11000g (ml) which corresponds to 0 …
220 mm of precipitation Nonlinearity:
<0,2%
in the whole range Temperature
compensation: ± 0,04 mm of precipitation in the whole range |
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Service port Data port Pulse output (independent of data output) |
USB or RS232 (115200, 8, N, 1) RS232 or RS485 (9600-115200, 8, N, 1) or SDI-12
(1200, 7, E, 1) RS485 and SDI-12 are galvanically separated by 1,5
kV Possible extensions (on order):
1) LAN port (RJ45) with (XPORT)
2) RS 232 with galvanic isolation
3) GPRS modem for data transfer to the METEOSERVIS's server "Open solid-state relay" with insulation
min. 1,5 kV Pulse duration 100
ms, 0 … 400 V, max. 150 mA DC |
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Communication protocols |
Binary
-
configuration, data from datalogger ASCII (Text) -
output in the set interval METDATA
- output in the set
interval SDI-12
- version 1.3 |
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Rain detector input |
To increase the sensitivity of the rain gauge in
very light rainfall (below 0,1 mm/hour), it is possible to connect an
external rain detector e.g. RDM2 (input is galvanically separated). Input activation: -
active
level
LOG1 = 5 … 15V DC / max 20 mA
- potential-free contact (I/O
isolation min 1,5 kV DC)
- open
collector
(only with 12V DC power supply) |
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Additional measurements |
Air temperature in
the lower vessel, rain gauge collar temperature, Indoor temperature (heating
sheet), Strain gauge temperature |
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Other functions |
Tempering the internal space of the weighing system Additional shell heating (optional), especially
suitable for mountainous areas Shock heating of the collar and inner tube of the
rain gauge Wind effect correction Discharging, blocking and resetting the device with
an external button Acoustic and optical signaling of operating states Simulated output of
the precipitation detector |
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Datalogger |
Integrated datalogger with capacity over than
130,000 records Storage interval optional: 1 … 60 min Capacity:
90
… 5400 days RTC circuit backed
up by an independent battery. |
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Power supply |
Electronics, pump: 12V DC or 24V AC/DC Heating:
24 … 46V AC |
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Consumption (tempering and shock heating not work at the same time) |
Electronics:
<1,2
W Pump:
25
W Tempering of the internal space:
115
W “Shock” heating:
100
W (OPTIONAL)
Tempering of the outer cover of the rain gauge: 80 W |
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Operating liquids |
Silicone oil – the using significantly increases of measurement
accuracy at long time light intensity precipitation (limits the evaporation
of rain water from weighed vessel). Antifreeze liquid - enables
year-round precipitation measurement. Monitoring the
amount and dilution of the liquid in the weighing container is controlled
AUTOMATICALLY. |
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Operating temperature |
–40°C … +60°C |
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Degree of protection |
Electronics … IP65,
Other parts … IP45 |
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Dimensions |
Diameter: 600 mm Height:
1000 mm |
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Weight |
Approx. 30
kg |