Campbell MMW-005 Manual de usuario

INSTRUCTION MANUAL

Campbell Scientific (Canada)Corp.

MMW-005

Solid State Wind Sensor

Dec 2010

WARRANTY AND ASSISTANCE

This equipment is warranted by CAMPBELL SCIENTIFIC (CANADA) CORP. (“CSC”) to

be free from defects in materials and workmanship under normal use and service for

twelve (12) months from date of shipment unless specified otherwise. ***** Batteries

are not warranted. ***** CSC's obligation under this warranty is limited to repairing or

replacing (at CSC's option) defective products. The customer shall assume all costs of

removing, reinstalling, and shipping defective products to CSC. CSC will return such

products by surface carrier prepaid. This warranty shall not apply to any CSC products

which have been subjected to modification, misuse, neglect, accidents of nature, or

shipping damage. This warranty is in lieu of all other warranties, expressed or implied,

including warranties of merchantability or fitness for a particular purpose. CSC is not

liable for special, indirect, incidental, or consequential damages.

Products may not be returned without prior authorization. To obtain a Return

Merchandise Authorization (RMA), contact CAMPBELL SCIENTIFIC (CANADA) CORP.,

at (780) 454-2505. An RMA number will be issued in order to facilitate Repair Personnel

in identifying an instrument upon arrival. Please write this number clearly on the outside

of the shipping container. Include description of symptoms and all pertinent details.

CAMPBELL SCIENTIFIC (CANADA) CORP. does not accept collect calls.

Non-warranty products returned for repair should be accompanied by a purchase order to

cover repair costs.

MMW-005 Solid State Wind Sensor

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TABLE OF CONTENTS

1. Introduction........................................................................................2

2. Principle of Operation........................................................................3

3. Specifications ....................................................................................3

4. Installation .........................................................................................4

5. Wiring................................................................................................6

5.1. Output String According to NMEA 0183:........................................................7

6. CR1000 Example Program................................................................7

7. Maintenance......................................................................................9

TABLE OF FIGURES

Figure 1 MMW-005 Sensor & Mounting Base.........................................2

Figure 2 Integrated Circuit ......................................................................2

Figure 3 C2410 Mounting Bracket ..........................................................4

Figure 4 Mounting Base Separated from Sensor ....................................5

Figure 5 Mounting Base Attached...........................................................5

Figure 6 True North Orientation Mark .....................................................6

Figure 7 MMW-005 Mounted ..................................................................6

MMW-005 Solid State Wind Sensor

__________________________________________________________________________________________

1. Introduction

The MMW-005 is a solid state wind sensor type (Figure 1),

which uses a specialized chip to measure wind speed and wind

direction based on the temperature differences across the chip

surface. These temperature differences are processed by a

small microprocessor in the sensor, resulting in a serial signal

for the indication of wind direction and wind speed. The output

signal of the sensor is RS-422 and is standardized according to

NMEA-0183

Figure 1 MMW-005 Sensor & Mounting Base

Figure 2 Integrated Circuit

MMW-005 Solid State Wind Sensor

__________________________________________________________________________________________

2. Principle of Operation

The Solid State Wind sensor uses a temperature sensitive

element to measure wind direction and wind speed. The

sensing element shown in Figure 2 consists of a specially

designed ceramic plate which incorporates an integrated circuit

(IC). The IC temperature is maintained at a constant value

above ambient temperature. Two pairs of thermocouples are

mounted on the IC at right angles.

If there is airflow, the thermocouples measure the temperature

difference over the IC surface. These values are then converted

to a measure of the wind speed and direction. Guide discs

along the top and bottom of the sensor ensure that wind passes

through the sensor in the correct manner. Mathematical

processing by the microprocessor and signal conditioner results

in a RS422 signal for wind speed and wind direction according

to the NMEA 0183 standard. The wind sensor has no moving

parts, which assures a long lifespan with only a minimum of

maintenance.

3. Specifications

Operating Range: Wind speed : 0…90 km/hr

Min. wind speed: 0.72 km/hr (values < 0.72 = 0

km/hr)

Wind direction: 0..360°

Values for wind direction at wind

speed < 1.8 km/hr = not valid

Inaccuracy: Wind speed : 1.8 km/hr ± 3% @

20°C

Wind direction: ± 3° @ 20°C

Response time: < 1 second

Stabilization time: < 1 hour after switching on

Dimensions: Ø 120 mm, height 105 mm

Weight: 200 grams

Material: Stapron N

Operating temp.: -25 to +70°C

Static discharge: The instrument is protected

against outside inductive

MMW-005 Solid State Wind Sensor

__________________________________________________________________________________________

interference up to a discharge

power of 600 Watt

Water ingress: Sealed to IP65

Mounting: Vertically, free-standing

Connection: 4-wire cable (0.34mm²), shielded

Supply voltage: 12 V DC +/- 10%

Power consumption: 125 mA maximum continuous

Communication Output: RS-422 (NMEA 0183 protocol)

serial

Baud rate: 4800

Data bits: 8

Stop bits: 1

Parity: none

4. Installation

The MMW-005 is mounted to either a horizontal or vertical pipe

with the use of the C2410 Mounting Bracket (Figure 3). The

C2410 can be mounted to a pipe with and outside diameter

ranging from 0.75 inches to 2.0 inches.

Figure 3 C2410 Mounting Bracket

Begin the installation process by removing the mounting base

from the MMW-005 (Figure 4). This can be done by placing

one hand under the bottom disk of the sensor. Then with your

other hand, grip the mounting base and pull it away from the

sensor.

MMW-005 Solid State Wind Sensor

__________________________________________________________________________________________

Figure 4 Mounting Base Separated from Sensor

Using the three screws supplied with the C2410 mounting

bracket, attach the sensor base to the C2410 (Figure 5). The

screws will need to be lined up with the threaded holes located

on the mounting bracket. It is recommended to leave the

sensor cable in place, as it can slide into the notch provided at

the tip of the bracket.

Figure 5 Mounting Base Attached

Before reattaching the MMW-005 to the mounting base make

note of the Orientation mark (Figure 6) on the top of the MMW-

005. This mark will need to be orientated to True North in

order to provide an accurate measurement of wind direction. It

may be helpful with the orientation process to align the symbol

along the length of the C2410 mounting bracket.

MMW-005 Guide

Disks MMW-005 Sensor

MMW-005

Mounting Base

MMW-005 Solid State Wind Sensor

__________________________________________________________________________________________

Figure 6 True North Orientation Mark

Once the orientation of the MMW-005 has been determined,

place the sensor in the mounting base in the required

orientation. You will then need to push the sensor into the base

until it is completely secured (Figure 7).

Figure 7 MMW-005 Mounted

The MMW-005 and C2410 can now be mounted to the intended

pipe using the provided v-bolt and hardware. Consideration

should be given to the proper siting of the sensor to ensure that

all potential obstacles are avoided.

5. Wiring

Connections should be made according to Table 1. The wind

sensor can be connected directly to the Rx port of the

datalogger.

CAUTION Always connect the White lead last.

MMW-005 Solid State Wind Sensor

__________________________________________________________________________________________

Table 1: Datalogger Connections

Wire Function Datalogger Connection*

White Power +12V

Brown Power Reference G

Green Output Transmit Rx terminal of Com Port**

Clear Shield G

* Wiring valid for CR800 series, CR1000, and CR3000

**Com Port will vary depending on availability. Should be either of C2, C4, C6, or C8 of the CR1000

5.1. Output String According to NMEA 0183:

NMEA B = GREEN

Baud rate = 4800

Data bits = 8

Stop bits = 1

Parity = none

Format: $WIMWV,ddd,R,ss.s,M,A<CR><LF>

Description:

$ = Start of sentence

WI = Device type: Weather Instruments

MWV = Wind speed and direction

ddd = Wind direction value [0..359º]

R = Relative to the vessel (not applicable)

ss.s = Wind speed value [0..25.5 m/s]

M = Unit for wind speed [m/s]

A = Data always valid for MMW-005

6. CR1000 Example Program

The MMW-005 is measured with the use of a datalogger

Control Port. The Control Port receives the RS422 data string

that the MMW-005 automatically sends approximately once per

second. RS422 is an Electronics Industries Association (EIA)

recommended standard to extend the RS232 50 foot limit. In

this configuration it provides for unidirectional data

transmission.

The default units of measure are degrees (wind direction) and

meters per second (wind speed). If other units are required

then the measurements will need to be manipulated in the

datalogger program. The following example shows the

MMW-005 Solid State Wind Sensor

__________________________________________________________________________________________

conversion from meters per second to kilometer per hour.

Refer to Table 2 for conversion factors for wind speed.

Table 2. Wind Speed Conversion Factors

Units Conversion Factor

Kilometers per Hour 3.6

Knots 1.944

Miles per Hour 2.237

Feet per Second 3.281

'CR1000 Series Datalogger

'Declare Public Variables

Public MMW005 As String * 20

Public NBytesReturned

Public MMW005Values (2) As Float

Alias MMW005Values (1) = Wind_Dir

Alias MMW005Values (2) = Wind_Speed

'Define Data Tables

' Note: These tables are examples only. Specific applications may require different outputs.

DataTable (Wnd2Min,True,-1)

DataInterval (0,2,Min,10)

'2 minute averages of WindDir and WindSpeed

WindVector (1,Wind_Speed,Wind_Dir,IEEE4,False,0,0,0)

FieldNames ("Mean_Horizontal_Wnd_Spd:,Unit_Vector_Mean_Wnd_Dir:,Standard_Deviation_Wnd_Dir")

EndTable

DataTable (Wnd10Min,True,-1)

DataInterval (0,10,Min,10)

'10 minute average of WindDir and WindSpeed

WindVector (1,Wind_Speed,Wind_Dir,IEEE4,False,0,0,0)

FieldNames ("Mean_Horizontal_Wnd_Spd:,Unit_Vector_Mean_Wnd_Dir:,Standard_Deviation_Wnd_Dir")

EndTable

DataTable (Wnd60Min,True,-1)

DataInterval (0,60,Min,10)

'Hourly Averages of Wind Speed and Direction

WindVector (1,Wind_Speed,Wind_Dir,IEEE4,False,0,0,0)

FieldNames ("Mean_Horizontal_Wnd_Spd:,Unit_Vector_Mean_Wnd_Dir:,Standard_Deviation_Wnd_Dir")

Maximum (1,Wind_Speed,FP2,False,True)

SampleMaxMin (1,Wind_Dir,FP2,False)

EndTable

'Main Program

BeginProg

SerialOpen (Com1,4800,0,0,10000)

Scan (5,Sec,0,0)

'Character 36 is $, and Character 13 is CR.

SerialInRecord (Com1,MMW005,36,0,13,NBytesReturned,01)

SplitStr (MMW005Values(),MMW005,"",2,0)

'Convert Wind Speed from m/s to km/hr

'*** Other Conversion Factors can be used as required ***

MMW005Values (2) = MMW005Values (2) * 3.6

'Call Output Tables

CallTable (Wnd2Min)

CallTable (Wnd10Min)

CallTable (Wnd60Min)

Tabla de contenidos

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