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Vaisala WINDCAP WS425, User Manual

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USER'S GUIDE____________________________________________________________________  

4 ___________________________________________________________________ M210361EN-E 

Factory Settings...................................................................22

 

RS-232 Default Settings for USA ...................................22

 

Default Settings of RS-232, RS-422, and  RS-485 for 
Europe ............................................................................23

 

Mounting..............................................................................26

 

Mounting Procedure on a 1-inch IPS Vertical Pipe........26

 

Inverted Mounting...........................................................26

 

Alignment.............................................................................27

 

Magnetic Declination Correction ....................................27

 

Compass Alignment with a Mast Adapter ......................28

 

Connections ............................................................................31

 

Powering..................................................................................33

 

Power Supplies....................................................................33

 

CHAPTER 4

 

OPERATION .................................................................................................35

 

Analog Mode ...........................................................................35

 

Wind Speed .........................................................................35

 

Wind Direction .....................................................................37

 

Missing Readings ................................................................37

 

Serial Mode..............................................................................38

 

Overview..............................................................................38

 

Serial Mode Default Settings for the USA ......................38

 

Serial Mode Default Settings for Europe........................39

 

Configuration Menu .............................................................39

 

Configuration Commands....................................................40

 

Handar RS-232 ..............................................................41

 

Identify Command I ........................................................41

 

Measurement Command Wx .........................................41

 

Missing Readings ......................................................42

 

Measurement Unit Change Command Ux .....................43

 

NMEA Standard .............................................................43

 

Missing Readings ......................................................44

 

NMEA Extended Message .............................................44

 

WAT11 Message............................................................46

 

Missing Readings ......................................................46

 

Wind Speed Units................................................................47

 

Average Interval ..................................................................47

 

Averaging Method ..........................................................47

 

Scalar Averaging .......................................................47

 

Vector Averaging.......................................................48

 

Output Interval .....................................................................48

 

Sensor ID Character............................................................48

 

Wind Direction Coast Threshold..........................................49

 

Head Orientation .................................................................49

 

Bit Rate................................................................................49

 

Parity ...................................................................................50

 

Data Bits ..............................................................................50

 

Save Configuration ..............................................................50

 

Zero Speed Calibration .......................................................50

 

Resume Operation ..............................................................51

 

SDI-12 Protocol .......................................................................51

 

SDI-12 Support Group.........................................................51

 

SDI-12 Electrical Interface...................................................51

 

Serial Data Line ...................................................................52

 

Voltage Transitions..............................................................52

 

Summary of Contents for WINDCAP WS425

Page 1: ...USER S GUIDE Vaisala WINDCAP Ultrasonic Wind Sensor WS425 M210361EN E ...

Page 2: ...echanical including photocopying nor may its contents be communicated to a third party without prior written permission of the copyright holder The contents are subject to change without prior notice Please observe that this manual does not create any legally binding obligations for Vaisala towards the customer or end user All legally binding commitments and agreements are included exclusively in ...

Page 3: ...2 MIL STD 202 Method 213 12 MIL STD 167 1 SHIPS 12 Third Party Testing Field Tests Included 13 NWS ASOS Mechanical Wind Sensor Replacement 13 Lawrence Livermore Labs 13 Tennessee Valley Authority 13 CETIAT Centre Technique des Industries Aéraulique et Thermiques 13 Trademarks 14 License Agreement 14 Warranty 14 CHAPTER 2 PRODUCT OVERVIEW 15 Introduction to WS425 15 Measuring Principle 15 Sensor Op...

Page 4: ... Mode 38 Overview 38 Serial Mode Default Settings for the USA 38 Serial Mode Default Settings for Europe 39 Configuration Menu 39 Configuration Commands 40 Handar RS 232 41 Identify Command I 41 Measurement Command Wx 41 Missing Readings 42 Measurement Unit Change Command Ux 43 NMEA Standard 43 Missing Readings 44 NMEA Extended Message 44 WAT11 Message 46 Missing Readings 46 Wind Speed Units 47 Av...

Page 5: ...rements aR0 60 Start Verification aV 61 Vaisala specific SDI 12 Commands Supported by WS425 62 Measurement Unit Change aXUx 62 Heater Control Command aXHx 63 Check Current Submode aX 63 Place Sensor in Submode B aXQx c c n yyyy 64 Reset the Sensor to Submode A Command aXS 65 Check Current Measurement Unit aX 65 SDI 12 TIMING 66 CHAPTER 5 MAINTENANCE 69 Visual Inspection of WS425 Ultrasonic Wind Se...

Page 6: ...ming Diagram 67 Figure 13 Solder Spot and Sensor Handling 70 Figure 14 Verifier 72 Figure 15 WS425FIX30 Adapter 81 Figure 16 WS425FIX60 Adapter 82 Figure 17 WS425FIX60 Adapter 83 List of Tables Table 1 Manual Revisions 8 Table 2 Sensor Ordering Options vs Supported Data Outputs 9 Table 3 Ordering Codes 9 Table 4 Maximum Voltages 11 Table 5 Sensor Features 17 Table 6 Wind Direction Coasting 20 Tabl...

Page 7: ... of the following chapters Chapter 1 General Information provides general notes for the product Chapter 2 Product Overview describes the features of the WS425 Ultrasonic Wind Sensors Chapter 3 Installation provides you with information that is intended to help you install this product Chapter 4 Operation explains the operation and programming of WS425 Chapter 5 Maintenance provides you with genera...

Page 8: ...f the wind speed in the technical data M210361EN C Corrections to Table 3 Figure 8 Table 11 and Chapter 5 Maintenance section Visual Inspection of WS425 Ultrasonic Wind Sensor added M210361EN D Updated power requirements New section on mounting the sensor upside down M210361EN E Correction to salt spray test MIL STD 810 Method 509 Feedback Vaisala Documentation Team welcomes your comments and sugg...

Page 9: ...T 11 message Vaisala Handar message RS 232 cable RS 232 NMEA message Vaisala WATT 11 message Vaisala Handar message RS 422 NMEA message Vaisala WATT 11 message Vaisala Handar message WS425 x 2 RS 232 RS 485 RS 422 RS 422 RS 485 cable Serial mode with wind speed unit meters per second RS 485 NMEA message Vaisala WATT 11 message Vaisala Handar message Table 3 Ordering Codes Old code New code 425A WS...

Page 10: ...e is a risk of injury or even death CAUTION Caution warns you of a potential hazard If you do not read and follow instructions carefully at this point the product could be damaged or important data could be lost NOTE Note highlights important information on using the product Product Related Safety Precautions Inverted Mounting WARNING Do not install the WS425 upside down in an airport application ...

Page 11: ... Heater Power ESD Protection Electrostatic Discharge ESD can cause immediate or latent damage to electronic circuits Vaisala products are adequately protected against ESD for their intended use However it is possible to damage the product by delivering electrostatic discharges when touching removing or inserting any objects inside the equipment housing To make sure you are not delivering high stat...

Page 12: ...o mentioned here are some third party tests that involved field testing of the sensor EN55011 Class A Group 1 EN50082 2 Radiated emissions Conducted emission Electrostatic discharge Radiated susceptibility Conducted susceptibility Electrical task transient burst surge Magnetic susceptibility Voltage dips interrupts MIL STD 426 Method RS03 Electromagnetic compatibility MIL STD 810 Method 509 Salt s...

Page 13: ... a paper titled Evaluation of a New Sonic Anemometer for Routing Monitoring and Emergency Response Applications A second paper titled Comparison of In Situ Data from the Handar Sonic Anemometer and the Met One Cup and Vane AMS proceedings of the 10th symposium on Meteorological Observations and Instrumentation published by Frank Gouveia and Thomas Lockhart Tennessee Valley Authority The TVA conduc...

Page 14: ...tware are held by Vaisala or third parties The customer is allowed to use the software only to the extent that is provided by the applicable supply contract or Software License Agreement Warranty For certain products Vaisala normally gives a limited one year warranty Please observe that any such warranty may not be valid in case of damage due to normal wear and tear exceptional operating condition...

Page 15: ...horizontal plane The sensor measures transit time the time that it takes the ultrasound to travel from one transducer to another The transit time is measured in both directions The transit time depends on the wind velocity along the ultrasonic path For zero wind velocity both the forward and reverse transit times are the same With wind along the sound path the up wind transit time increases and th...

Page 16: ...s even though the velocity of sound affects individual transit times Incorrect readings may occur when a large raindrop or ice pellet hits a transducer They are eliminated by a proprietary signal processing technique The wind velocity that is most affected by turbulence error is eliminated so that wind speed and wind direction are calculated from the best two vectors Sensor Operating Modes There a...

Page 17: ...Yes Yes Scalar averaging of wind speed and direction 1 s 9 s No No 3 s 1 h Vector averaging of wind speed and direction 1 s 9 s No No 3 s 1 h Wind direction coasting Yes No No Yes Wind direction reversible for upside down mounting Yes No No No Enable disable heater command No No Yes Yes Selectable wind speed unit Yes No Yes Yes Gust wind speed and direction over averaging time Calculate from insta...

Page 18: ...ure 1 Different Wind Speed and Direction Presentations Wind Speed X and Y Components The wind speed x y is represented as two scalar speeds one parallel to the N S direction x and the other y parallel to the W E direction The speed unit may be m s kt mph or km h x WS cos WD y WS sin WD Scalar Averaging of Wind Speed and Direction The scalar average of wind speed and wind direction is available in ...

Page 19: ...age stays representative of the true situation even if individual samples occur in both sides of the zero direction Vector Averaging of Wind Speed and Direction The vector average is available in SDI 12 submode B and serial mode Each x velocity and y velocity measurement over the averaging interval is added and then divided by the number of measurements The resultant average x velocity and average...

Page 20: ...terval The gust averaging count can be specified which is the number of measurements one measurement each second average to produce the gust values for speed and direction It has a range of one to nine counts As a gust averaging count is specified as one the reported wind gust is the highest instantaneous reading An example of a gust averaging count of five will follow In this example of 14 measur...

Page 21: ...al radius of 300 m WARNING To protect personnel and the wind sensor a lightning rod must be installed with the tip at least one meter above the wind sensor The rod must be properly grounded compliant with all local applicable safety regulations Installation Procedure Unpacking Instructions The ultrasonic wind sensor comes in a custom shipping container The sensor must be removed from the container...

Page 22: ...tings available for WS425 if a serial RS 232 protocol is used For RS 485 and RS 422 protocols only a single factory configuration is available The factory settings are for firmware version v6 12 unless indicated otherwise RS 232 Default Settings for USA Operation Mode Handar RS 232 Wind Speed Units Miles Hour Average Interval seconds 1 Averaging Method Scalar Output Interval seconds 0 for polled 0...

Page 23: ...ind Speed Units Meters Second Average Interval seconds 3 Averaging Method Scalar Output Interval seconds 0 for polled 1 Sensor ID Character A Wind Direction Coast Threshold speed units 0 0 Head Orientation Up Baud Rate 9600b Parity None Data Bits 8 0 2 in sensors that are delivered to airport applications NOTE These default settings are delivered with product ordering options x2xxx for example WS4...

Page 24: ...________________ M210361EN E 0311 011 Figure 2 Mounting the Sensor to Adapter The following numbers refer to Figure 2 above 1 Sensor body 2 Cable connector 3 Spacer ring 4 3 16 inch Hex socket bolt or standard screw 5 Sensor adapter 6 Fastening clamp 7 Vertical tube The dimensions of the adapter are illustrated in Figure 3 on page 25 ...

Page 25: ...____________________________________________________ Installation VAISALA _______________________________________________________________________ 25 0212 045 Figure 3 WS425 Main Dimensions The dimensions are in millimeters ...

Page 26: ...the cable to the sensor routing it through the adapter 3 Attach the adapter to the sensor body and tighten the bolt 4 Run the cable out of the adapter slot between the sensor and the clamp Optionally you can run the cable inside the vertical pipe 5 Place the sensor on the pipe and slightly tighten the clamp s bolt 6 Align wind direction as explained in section Alignment on page 27 Inverted Mountin...

Page 27: ...the sensor body for example with paint or colored tape to indicate north and south so that it can be seen from the ground Wind direction can be referenced to either the true north which uses the earth s geographic meridians or to the magnetic north which is read with a magnetic compass The magnetic declination is the difference in degrees between the true north and magnetic north See Figure 4 belo...

Page 28: ... S transducer heads of the ultrasonic wind sensor are exactly in line with the compass Adjust the heads by moving them to the left or right For the correct ground position of the installer see Figure 7 on page 30 2 If the alignment is not correct lower the tower 3 Loosen the clamp at the bottom of the sensor s adapter and rotate the sensor so that the heads marked with the N and with the S are exa...

Page 29: ..._________________________________________________________ Installation VAISALA _______________________________________________________________________ 29 0208 025 Figure 6 Correctly Aligned WS425 Ultrasonic Wind Sensor ...

Page 30: ...______________________ M210361EN E 0208 024 Figure 7 Adjusting the N S Heads The following letters refer to Figure 7 above A The installer is too far to the left B The installer is in line with the sensor C The sensor s appearance is shown when the installer is in the correct position The sensor however is not correctly aligned ...

Page 31: ...ure the connector is protected from rain and snow Table 8 below illustrates usage of the pins with different protocols Table 8 WS425 Sensor Pins NOTE The short circuits between pins 5 6 and 7 are required for selecting the protocol Sensor Pin No Protocol RS 232 RS 422 RS 485 Analog SDI 12 1 GND GND GND GND GND 2 GND GND GND GND GND 3 GND GND GND GND GND 4 5 6 7 GND 8 GND GND GND GND GND 9 Data out...

Page 32: ...__________________________________________________________________ M210361EN E 0212 041 Figure 8 Open Lead Cables for WS425 Sensors For 10 meter cables that are available from Vaisala see section Technical Data on page 79 Choose the cable according to the desired communication protocol ...

Page 33: ...alternates between 14 mA when idle and short peaks of 155 mA during measurement typical The average current consumption is 29 mA RMS NOTE Some DC power supplies are based on a chopper circuit that operates at a 100 kHz frequency Avoid using such power supplies with WS425 since the measurement can be distorted by the ripple in the DC output The heated ultrasonic wind sensors require 12 VDC for the ...

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Page 35: ...to initialize and stabilize Then the sensor takes a 0 35 second measurement and synthesizes the analog outputs of wind speed and wind direction The cycle is repeated every second until power is turned off Wind Speed The factory sets the wind speed unit of the analog mode to miles per hour This is the only option available for the analog mode The wind speed output at pin 14 is 0 to 12 V pulsed outp...

Page 36: ..._________________________________________ M210361EN E 0212 039 Figure 9 Frequency Connection The wind speed output at pin 15 is a voltage that varies linearly from 0 VDC at 0 mph to 1 VDC at 125 mph In SI units the voltage varies linearly from 0 VDC at 0 m s to 1 VDC at 55 88 m s 0212 038 Figure 10 Wind Speed ...

Page 37: ... frequency output pin 14 must be connected to ground see Figure 10 on page 36 Wind Direction The DC reference voltage that inputs the sensor at pin 12 produces a voltage that represents the wind position The reference voltage must be in the range of 1 0 to 4 0 VDC The output at pin 13 is 0 VDC at zero degrees and increases to the maximum input voltage at 359 degrees 0212 040 Figure 11 Analog Conne...

Page 38: ...e the serial line settings may not be known for a device the settings are held as constant for the first five seconds after powering up the sensor During this time the sensor responds to commands issued with settings such as 9600 bit s 8 data bits parity None 1 stop bit Serial Mode Default Settings for the USA Vaisala WS425 Ultrasonic Anemometer Firmware Version v6 04 Operation Mode Handar RS 232 ...

Page 39: ... Up Baud Rate 9600b Parity None Data Bits 8 NOTE These default settings for Europe are used for product ordering options x2xxx for example WS425 A2A1A where the number 2 refers to the default settings Configuration Menu The configuration menu can be opened by typing Open or Open id where id is the identification character of the sensor If the sensor has been running for more than five seconds use ...

Page 40: ... Baud Rate 9600b 10 Parity None 11 Data Bits 8 12 Save Configuration 13 Do Zero Speed Calibration 14 Resume Operation Enter Function Number Each configuration parameter is displayed together with the currently active setting The configuration parameters can be changed by selecting the number of the parameter followed by ENTER NOTE After modifying the parameters type 12 for storing the new paramete...

Page 41: ...ing Commands Command Name Page I Identify 41 Wx Measurement 41 Ux Measurement unit change 43 Identify Command I The identify command is I The following is an example of the command I VAISALA WS425A AH 600 Vaisala WS425A AH is the vendor and model number 600 is version 6 00 of models WS425A AH Measurement Command Wx The measurement command is Wx where x is the time for averaging wind speed and wind...

Page 42: ...ficant digit 12 dot character 13 Wind speed tenth digit 14 M for miles per hour K for knots L for kilometers per hour T for meters per second 15 Check sum most significant digit See note 16 Check sum least significant digit 17 03H ETX end of transmission 18 CR carriage return 19 LF line feed NOTE The checksum is calculated from 13 characters from position 2 through 14 The accumulator initializes a...

Page 43: ...ndard The standard variable length comma separated MWV wind message is defined by NMEA 0183 V2 20 as follows WIMWV dir ref spd uni sta chk cr lf where WIMWV Fixed text dir Wind angle 0 to 359 degrees ref Reference R Relative T True spd Wind speed uni Wind speed units K kmph km h M mps m s N kt sta Status A Data Valid V Invalid Data Fixed text chk Checksum 8 bit XOR excluding and cr Carriage return...

Page 44: ...tandard MWV wind message is defined as follows P id MWV dir ref spd uni sta chk cr lf where P Fixed text id Is the data ID A Z MWV Fixed text dir Wind angle 0 to 359 degrees ref Reference R Relative T True spd Wind speed uni Wind speed units K kmph km h M mps m s N kt sta Status A Data Valid V Invalid Data Fixed text chk Checksum 8 bit XOR excluding and cr Carriage return code ASCII 0DH lf Line fe...

Page 45: ...SCII 0DH lf Line feed code ASCII 0AH Table 11 Checksum Table ID Character id Checksum chk Polling String A 72 WIPAQ 72 cr lf B 71 WIPBQ 71 cr lf C 70 WIPCQ 70 cr lf D 77 WIPDQ 77 cr lf E 76 WIPEQ 76 cr lf F 75 WIPFQ 75 cr lf G 74 WIPGQ 74 cr lf H 7B WIPHQ 7B cr lf I 7A WIPIQ 7A cr lf J 79 WIPJQ 79 cr lf K 78 WIPKQ 78 cr lf L 7F WIPLQ 7F cr lf M 7E WIPMQ 7E cr lf N 7D WIPNQ 7D cr lf O 7C WIPOQ 7C c...

Page 46: ...pd Wind speed in m s multiplied by 10 for example 045 is 4 5 m s three digits dir Wind direction with two octal numbers for 6 bit binary data for example 458 3710 corresponds to 37 64 360 208 degrees The WAT11 polling command is defined as follows esc id where esc Escape character ASCII 27H id Sensor ID for example A Missing Readings The WAT11 message reports missing data as slashes NOTE The senso...

Page 47: ...each consecutive wind direction measurement is one second Each wind direction measurement taken over the preceding averaging interval is summed and the sum is divided by the number of measurements The same averaging interval is used for both the average wind speed and average wind direction The sensor computes a true running average If the data acquisition system requests data before the initial a...

Page 48: ...can be selected in full seconds between 1 and 9 seconds These settings are independent of the averaging interval configuration parameter 3 see section Average Interval on page 47 Regardless of the length of the output interval the last measurement sample before transmission is always the last sample of the averaging window Therefore the transmitted data is always based on the latest measurements I...

Page 49: ...le the direction coast speed 2 0 Consecutive measurements are as presented in Table 12 below Table 12 Consecutive Measurements of Wind Direction Measured Wind Speed Measured Wind Direction Wind Direction Used for Averaging 3 5 350 350 2 5 340 340 2 2 340 340 1 9 175 340 coasting 1 2 045 340 coasting 2 1 345 345 NOTE The wind direction coast threshold can be set to a non zero value only when the av...

Page 50: ...The zero speed calibration is done to all sensors in the factory before delivery There is no reason to perform this tuning periodically Instead use the margin verifier for periodic testing as described in section Periodic Testing on page 71 Do the zero speed calibration only after possible firmware update or if the periodic test indicates too high wind speeds To perform the zero speed calibration ...

Page 51: ...y powered operation with minimal current drain Low system cost Use of a single data recorder with multiple sensors on one cable Up to 200 feet 60 meters of cable between a sensor and a data recorder SDI 12 Support Group The SDI 12 Support Group is an association of companies that produce and use SDI 12 products with the purpose of reviewing requests to enhance clarify or modify the SDI 12 architec...

Page 52: ...f serial data for the SDI 12 standard The data line uses negative logic Table 13 Logic and Voltage Level for Serial Data Condition Binary State Voltage Range Marking 1 0 5 to 1 0 volts Spacing 0 3 5 to 5 5 volts Transition Undefined 1 0 to 3 5 volts Voltage Transitions During normal operation the data line voltage slew rate must not be greater than 1 5 volts per microsecond Impedance When an SDI 1...

Page 53: ... the data collection from the first sensor is complete A typical recorder sensor measurement sequence proceeds in the following order 1 The data recorder wakes all sensors on the SDI 12 bus with a break 2 The recorder transmits a command to a specific addressed sensor instructing it to make a measurement 3 The addressed sensor responds within 15 0 milliseconds returning the maximum time until the ...

Page 54: ... B As a default the sensor runs in submode A Specific commands can be issued in order to Set the sensor into submode B and initiate continuous measurement Collect averaged data in submode B Force the sensor back to submode A If a sensor is not forced back to the low power submode A by the data logger the sensor will eventually do this independently after two hours have elapsed The timing diagram i...

Page 55: ... is used to ensure that a sensor is responding to a data recorder or another SDI 12 device It asks a sensor to acknowledge its presence on the SDI 12 bus The command is the following a where a The sensor address Terminates the command The response is the following a CR LF where a The sensor address The default values is zero 0 CR LF Terminates the response The following is an example of the comman...

Page 56: ... 11 cccccccc An 8 character vendor identification Vaisala_ mmmmmm 6 characters specifying the sensor model number WS425 vvv 3 characters specifying the firmware version 604 For example xxx xx An optional field up to 13 characters used for a serial number or other specific sensor information that is not relevant for operation of the data recorder not used CR LF Terminates the response Address Query...

Page 57: ...d changes the address of a sensor After this command has been issued and responded to the sensor is not required to respond to another command for one second This gives the sensor time to write the new address to non volatile memory The command is the following aAb where a The sensor address A The change address command b The address to change to Terminates the command The response is the followin...

Page 58: ...ng aM where a The sensor address M The start measurement Terminates the command The response is the following atttn CR LF where a The sensor address ttt The specified time in seconds until the sensor will have the measurement ready 001 n The number of measurement values the sensor will make and return in one or more subsequent D commands 5 CR LF Terminates the response Send Data Command aD0 This c...

Page 59: ...send data command Terminates the command When the previous command WS aM is given the response is the following a WS WD x y s CR LF where a The sensor address WS Polar wind speed in selected units format ss s s WD Polar wind direction in degrees format dd d x x component of wind speed in selected units format ss s s y y component of wind speed in selected units format ss s s s Static speed of soun...

Page 60: ...The options are 0 SDI 12 submode A 1 SDI 12 submode B spare 1 digit for factory use format c CR LF Terminates the response The above are verification data fields Continuous Measurements aR0 A sensor that is able to continuously monitor the phenomena to be measured does not require a start measurement command M The data can be read directly with the R0 command WS425 uses this command when the senso...

Page 61: ... units Format ss s s GD Gust direction n1 second average over the same time period as the gust speed Format dd d CR LF Terminates the response 1 The parameters yyyy and n are issued to the sensor as a part of the Place sensor in submode B aXQx c c n yyyy command This command must be given to the sensor before aR0 See the command description for aXQ for full description of the parameters Start Veri...

Page 62: ...will be returned 4 CR LF Terminates the response Vaisala specific SDI 12 Commands Supported by WS425 Measurement Unit Change aXUx This command sets the desired measurement unit for wind speed The command is available in submode A only The command is the following aXUx where a The sensor address XU The change measurement unit command x Desired wind speed unit The options are 0 mph default value 1 k...

Page 63: ...ostatically controlled The command works only for heated sensor models The command is the following aXHx where a The sensor address XH The heater control command x The options are 0 disable the heater 1 enable the heater Terminates the command The response is the following a CR LF where a The sensor address x The new wind speed setting CR LF Terminates the response Check Current Submode aX The com...

Page 64: ...ed wind data and gust wind speed and direction The command is the following aXQx c c n yyyy where a The sensor address XQ The place sensor in submode B command x The desired wind averaging method The options are 0 use scalar averaging 1 use vector averaging c c The wind direction coasting threshold in the current wind speed units The coasting can only be used with scalar averaging n The number of ...

Page 65: ...ay in mode B until a 2 hour time period has elapsed This computation period can be aborted earlier by issuing the command XS The command is the following aXS where a The sensor address XS The reset sensor to submode A command Terminates the command The response is the following a CR LF where a The sensor address CR LF Terminates the response Check Current Measurement Unit aX The command is the fol...

Page 66: ...his is 1 66 milliseconds with no tolerance A data recorder transmits a break by setting the data line to spacing for at least 12 milliseconds The sensor will not recognize a break condition for a continuous spacing time of less than 6 5 milliseconds The sensor will always recognize a break when the line is continuously spacing for more than 12 milliseconds When receiving a break a sensor must dete...

Page 67: ...e end of the stop bit and the start bit e g between characters on any characters in the command or the response No tolerance This permits a response to an M command to be sent within a 380 millisecond window Sensors must return to a low power standby mode after receiving an invalid address or after detecting a marking state on the data line for 100 milliseconds Tolerance 0 40 milliseconds When a r...

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Page 69: ...e sensor when the sensor is installed on the tower This provides protection to the transducers and validates that the mechanical spacing of the transducers is within specifications Some cautions and inspection criteria are listed below 1 Do not rotate the transducers Rotating the transducers will destroy the array of the ultrasonic wind sensor A soldering spot can be seen on each ceramic transduce...

Page 70: ...other For the correct alignment see Figure 13 below 4 The verifier should slide over the transducers without excessive force This validates that the mechanical spacing of the transducers is within specifications 5 Do not scrape or touch the transducers with sharp objects Cutting the silicon rubber sleeve on the transducer affects the acoustical matching layer of the transducer and destroys the arr...

Page 71: ...r the bit rate generator If you use the serial communication modes and the oscillator loses accuracy the sensor stops communicating Thus the sensor cannot send erroneous values produced by faulty timing Perform periodic testing to detect slow deterioration of the sensor before it significantly affects accuracy Perform the test either in the field or in a laboratory The periodic test uses the verif...

Page 72: ...USER S GUIDE____________________________________________________________________ 72 __________________________________________________________________ M210361EN E 0003 016 Figure 14 Verifier ...

Page 73: ...ded in Chapter 3 section Installation Procedure on page 21 This adapter fits onto an 1 IPS standard pipe Following the dimensions of the adapter you may prefer to design your own sensor mounting See also a dimensional drawing of the sensor in Appendix A on page 81 Please make sure that no obstacles are near the sensor especially at the level of the ultrasonic transducers Q We intend to install a W...

Page 74: ... a small displacement of the sensor may completely remove an interference problem that occurs at a certain point of the mast Trial and error is really the only way of finding out whether RF disturbance will be an issue Q I have tried out my WS425 When I turn the power on the sensor is not sending any data I used an RS 232 checker but the Tx line is not active no data is coming to my PC A By defaul...

Page 75: ...From HyperTerminal select File Properties and click Configure Set communication parameters 9600 8 N 1 and Flow Control as None 3 From HyperTerminal select View Font Set Font as Terminal 4 Select Call Disconnect Then select Call Connect 5 Switch the sensor power supply on and off Make sure that the sensor is completely powered down before reconnecting the power supply Many power supplies store ener...

Page 76: ...roblem 3 On the Problem Report please explain What failed what worked did not work Where did it fail location and environment When did it fail date immediately after a while periodically randomly How many failed only one defect other same or similar defects several failures in one unit What was connected to the product and to which connectors Input power source type voltage and list of other items...

Page 77: ...Chapter 6 ___________________________________________________________ Troubleshooting VAISALA _______________________________________________________________________ 77 Vaisala Service Centers ...

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Page 79: ...ange 0 65 m s 0 135 m s 0 3 mph 0 26 knots or 3 of reading whichever is greater Wind Direction Measurement range 0 360 Starting threshold virtually zero Delay distance virtually zero Resolution 1 Accuracy wind speed over 1 m s 2 Outputs Digital outputs type RS 232 RS422 or RS485 four different message formats bit rate adjustable from 1200 to 19200 bit s available averages RS 232 1 to 9 seconds SDI...

Page 80: ...5 C 40 131 F WS425 heated 55 55 C 67 131 F Material body stainless steel sensor arms stainless steel transducer heads silicone rubber and PVC Dimensions Height Width Depth 355 mm 250 mm 286 mm 14 10 12 Weight WS425 stainless steel 1 7 kg 3 7 lbs Complies with EMC standard EN61326 1 1997 Am1 1998 Generic Environment Accessories Cable supporting analog outputs 10 m ZZ45204 Cable supporting RS 232 ou...

Page 81: ...________________________________________________________________Drawings VAISALA _______________________________________________________________________ 81 APPENDIX A DRAWINGS 0212 043 Figure 15 WS425FIX30 Adapter ...

Page 82: ...USER S GUIDE____________________________________________________________________ 82 __________________________________________________________________ M210361EN E 0301 012 Figure 16 WS425FIX60 Adapter ...

Page 83: ...___________________Drawings VAISALA _______________________________________________________________________ 83 0301 013 Figure 17 WS425FIX60 Adapter The following numbers refer to Figure 17 above 1 Adapter tube 2 Fastening clamp 3 Fastening bolt 4 Allen key ...

Page 84: ...USER S GUIDE____________________________________________________________________ 84 __________________________________________________________________ M210361EN E ...

Page 85: ...Appendix A ________________________________________________________________Drawings VAISALA _______________________________________________________________________ 85 ...

Page 86: ...www vaisala com M210361EN ...

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