User Guide M211095en-h



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aC! and aM! respectively. The difference is that Cyclic Redundancy Check is appended to the data returned by the
aD0! command.
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The bit Cyclic Redundancy Check value is appended to the response of the
aD0!
command before . It is encoded as three ASCII characters using the following algorithm:
1st character=0x40 OR (CRC shifted right 12 bits)
2nd character=0x40 OR ((CRC shifted right 6 bits) AND 0x3F)
3rd character=0x40 OR (CRC AND 0x3F)
Example
1MC! 10025 D 1+2.7+85.2-0.2-2.7+770.5CAH
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6. Maintenance WMT700 Maintenance
WMT700 is a very reliable and rugged sensor. Since no moving or consumable parts are used, only minimal periodic maintenance is required.
Periodic maintenance for WMT700 includes:
• Checking that the transducers are not bent, twisted, or rotated. All transducers must be parallel to each other. Damaged array may cause inaccurate readings.
• Checking that the transducers have not been scraped or touched with sharp objects.
The silicon rubber coating must be undamaged. If the transducers or the coating is damaged, send the sensor to Vaisala for repair.
• Verifying functionality by using the optional verifier to check the distance between transducers.
WMT700 has been calibrated at the factory, and recalibration is not required. Periodic calibration of WMT700 is not required for technical reasons. However, some quality management systems may require regular calibration of the measuring instruments. To fulfill these requirements, it is recommended that you recalibrate the sensor every 24 months. For more information, contact Vaisala Service Center.
If the sensor becomes contaminated, cleaning the sensor carefully using a soft, lint-free cloth moistened with mild detergent. Do not use solvents or a pressure washer to clean the sensor, since they may damage the silicon rubber transducer sleeve.
Do not clean the instrument or sensor unless it is clearly contaminated.
CAUTION!
Some instruments and sensors or versions are heated. To avoid injury, do not touch heated parts when heating is on.
WARNING!
Handle with care. Any impact on the instrument or sensor array may cause damage and lead to incorrect measurements.
CAUTION!
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Any temporary object (such as snow, ice, or a bird) that blocks the observation path between the ultrasonic transducer heads may lead to inaccurate or incorrect measurements.
CAUTION!
Do not open the instrument or sensor. There are no user-serviceable parts inside.
CAUTION!
In maritime environments, it is not possible to perform WMT700 software updates Testing Operation
Optional verifier (WMT70VERIFIER)
WMT700 measures the time it takes for an ultrasonic signal to travel from one transducer to another. Therefore, the accuracy of the sensor depends on the distance between the transducers and the time-of-flight measurement circuit, which uses a crystal oscillator for its time reference.
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If necessary, you can verify the distance between the transducer arms with an optional verifier. You can order the verifier from Vaisala as an accessory.
Vaisala recommends that you test the proper operation once a year or if you suspect that the transducers may have been damaged. You can perform the test either in the field or in a laboratory.
Do not perform the test when the wind speed is more than 10 ms (22 mph) or when there is a risk of thunderstorm in the area.
Some random data samples maybe lost during the verifier test. This does not indicate that sensor or instrument is faulty.
Disable heating before performing the verifier test.
To disable heating, disconnect the heater supply voltage or set the heaterOn parameter to. Slip the verifier over the 3 transducers.
2. Start wind measurement. The command depends on the selected communication profile. Make sure that WMT700 reads less than 0.22 ms (0.5 mph) with the verifier in place.
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4. Remove the verifier.
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7. Troubleshooting Problem Situations


Document code
Testsetup according to
More information
Optiontemperature range
Optionheating
Optionhardware interface
Optionunit used
Optionoutput configuration
Selectionoutput configuration
Optionadapter type
Optionaccessories
Order codedescription
Aout1 selected option
Output signal
Swnddiroffset,(angle)
Parameterdefinition
Power supplywire colors
Used heating option
Heating option
Wire type/cable length
Descriptionspare part item
Wmt700connector pin
Open commandto activate the command, press enter
Commanddescription
Wind_getfetches wind calibration information.more information
S command. power must be on for at least 5 seconds after the s
Startcommand.more information
Itemdescription
Bitdescription
G command to fetch the current wmt700 parameters. disable error messages with the command s messages,0
Errors. if all values are valid, wmt700 sends the following response:0,0,0,0you can also use the g
Data message number
Ws425 and sdi messages
Parametername
Parameterdefault
Start command.to stop measurement, use the stop
Wb,wfirmware
Wf output:wff6785672109876.5432.1k99xx5.21.2 ws425 f/g asos data messagewmt700 responds to the wa
Bytedescription
Parameterdefault value
Id character
Wx command with a character fixed-length data message.character
Start command. to stop measurement, use thestop
Problemprobable cause
Error/eventcode
Parameter name
Propertydescription/value
Analog outputs for wind direction
Itemorder code
Configuration mode / measurement
Settingparameter
Start command. you can stop the measurement with the stop
Example of the command and response:
Baud........................................................................ 105clearerr
S............................................................................... 103sleep
Gget message. get parameter.........................................................104h
Jjunction box...............................................................28l



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