Met One Instruments MSO User manual

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Met Station One | Rev B
Rev B
Met Station One
Quick Reference Guide
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Met One Instruments, Inc
1600 NW Washington Blvd.
Grants Pass, OR 97526
Telephone: [phone]
Facsimile: [phone]
www.metone.com

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Met Station One | Rev B
Met Station One
Measurements
Wind Speed and Wind Direction
The Met Station One (MSO) uses a three cup anemometer and lightweight vane tail to
accurately measure the speed and direction of the wind. The rotation of the cups and
vane are converted to electrical signals which are directly proportional to Wind Speed
and Direction. The basic operation is based on the proven 014/024 Wind Sensors.
•Wind Speed Range 0 –50 m/sec
•Wind Speed Resolution 0.1 m/sec
•Wind Speed Accuracy ±2%
•Wind Direction Range 0 –360°
•Wind Direction Resolution 1°
•Wind Direction Accuracy ±5°
•Threshold, both Speed & Direction 1 m/sec
Temperature and Humidity
The Platinum Temperature and Capacitive Humidity sensors are built into the
temperature shield at the bottom of the sensor. The integral shield limits errors due
to solar radiation. The sensing elements are enclosed in an IP65 protective membrane.
•Temperature Range -40°C to +60°C
•Temperature Resolution 0.1°C
•Temperature Accuracy ±0.4°C
•Relative Humidity Range 0-100%
•Relative Humidity Resolution 1%
•Relative Humidity Accuracy ±4%
Barometric Pressure
A solid state pressure sensor provides an accurate measurement of barometric
pressure changes over a wide range. Electronic temperature compensation is included
for highest accuracy over the operating temperature of the sensor.
•Measurement Range 500 –1100 mbars
•Measurement Resolution 0.1 mbar
•Measurement Accuracy ±2 mbars
External Rain Gauge Input
An external contact closure rain gauge such as the Met One 360 or 370 series can be
connected to the MSO; the measurement is then integrated into the MSO serial data.
•Rain Gauge Resolution 0.25mm or 0.01 in of rain per tip

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Met Station One | Rev B
Met Station One
Easy Installation
Siting
•Find suitable location within cable length of recording electronics / display.
•Locate true north.
Mounting
•Use quick mount u-bolts to install on vertical or horizontal mast, pole or pipe.
•Tighten nuts, keeping sensor level.
Direction Alignment
•Install alignment shoulder screw into wind direction vane hub.
•Align sensor so wind direction counterweight is to the South, vane tail is to true
North.
•After alignment, remove shoulder screw so vane will rotate freely.
Check Operation
•Check that the vane and cups rotate freely.

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Met Station One | Rev B
Met Station One
Simple Serial Connections
The Met Station One platform comes with a choice of both RS-232 and SDI-12 serial
outputs, or RS-485 and SDI-12.
RS-232 Configuration
•9600 baud, 8 data bits, no parity, 1 stop bit, and no flow control
SDI-12 Configuration
•Default address 0
•Conforms to SDI-12 V1.3
RS-485 Configuration
•Default trigger 1
Output String Format:
SSS.S,DDD,+TTT.T,HHH,PPPP.P,RRR.RR,XXXX,VV.V,M0,*CCCCC<CR><LF>
•SSS.S = Wind Speed, (m/s default)
•DDD = Wind Direction (degrees)
•+TTT.T = Temperature (degrees C default)
•HHH = Relative Humidity (% RH)
•PPPP.P = Barometric Pressure (mbars default)
•RRR.RR = External Rain Input (0.25mm/tip default)
•XXXX = (Future Optional Field)
•VV.V = Battery Voltage (Volts)
•M0 = Configuration and Status Bytes
•*CCCCC = Message Checksum
Connections
•Run cable to recorder or computer and connect using the following wiring:
Wiring
•RED +10 TO +36 VOLTS DC, 7mA@12V typical
•BLK POWER COMMON
•WHT RS-232 TX (MSO-232) OR RS-485+ (MSO-485)
•BRN RS-232 RX (MSO-232) OR RS-485- (MSO-485)
•GRN SIGNAL COMMON
•BLU SDI-12
•ORN EXTERNAL RAIN GAUGE INPUT
•WHT/BRN SHIELD (must be grounded for transient protection to function)