Campbell MMW-005 User manual

INSTRUCTION MANUAL
Copyright © 2008
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 [phone]. 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
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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
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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
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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
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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
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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
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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
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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)

MMW-005 Solid State Wind Sensor
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NextScan
EndProg
7. Maintenance
The wind sensor has no moving parts, and requires no other
maintenance than the cleaning of the sensor itself. The time
interval for cleaning will depend on the installation site.