Met One Instruments MSO Manuel utilisateur

Met Station One | Rev B

Rev B

Met Station One

Quick Reference Guide

Met One Instruments, Inc

1600 NW Washington Blvd.

Grants Pass, OR 97526

Telephone: (541) 471-7111

Facsimile: (541) 471-7116

www.metone.com

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

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.

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)

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