User Guide M211095en-h

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More Information
‣ Configuration Parameter Descriptions (page 187)
3.9 Heating
To avoid injury, do not touch the heated parts of the wind sensor when the heating is enabled.
WMT700 can include a heating functionality that ensures proper operation in cold environmental conditions or in cases where snow and ice buildup is possible.
WMT700 User Guide

In addition to the standard non-heated version, WMT700 can be preconfigured at the factory according to your order:
• Heating for the transducers only
• Heating for both transducers and array arms
• Heating for body, transducers, and array arms
Make sure that the supply output power capacity is high enough especially when transducers, array arms, and sensor body are equipped with heaters. Also, note that there are individual connections for applying the heating voltage Heated Transducers
The heating functionality has a thermostatic control with temperature sensors in each transducer. The control function keeps the transducer temperature above 0 C and adds heating power when necessary. Therefore, heating is only activated when there is a risk of ice buildups. If a sensor is blocked, WMT700 increases the heating power to melt the ice and returns to lower power after a period of time.
You cannot change the heating parameters, but you can enable or disable the heating functionality with configuration parameters. When heating voltage falls below 18 VDC, an alarm is raised. Heating is automatically disabled if heating voltage falls below 15 VDC.
Regardless of heating voltage, the maximum heating power is limited to 40 Wand the average heating power is limited to 30 W. The maximum power control is achieved by automatically sequencing the transducer heaters depending on a heating voltage. At low heating voltages, all the transducers are heated simultaneously. At mid-range, two of the transducers are heated. At high voltage end, a single transducer is heated at a time. A pulse width modulation (PWM) scheme is used to control the average heating power Heated Transducers and Arms
In addition to heated transducers, the array arms can also be heated, which prevents ice buildup on the arms.
The functional principle is the same as with the heated transducers only, but the maximum heating power is limited to 200 Wand the average heating power is limited to 150 W.
Chapter 3 – Functional Description

3.9.3 Heated Body, Transducers, and Arms
To avoid injury, do not touch the heated parts of the wind sensor when the heating is enabled.
The fully heated version of WMT700 is suitable for harsh weather conditions. It provides heating for the sensor body, transducers, and arms.
The functional principle is the same with the heated transducers and arms. Body heating is controlled independently of transducer and arm heating. The maximum heating power for the fully heated WMT700 is 350 Wand the average heating power is 250 Win harsh weather conditions. The inner temperature of the unit is measured continuously. If the inner temperature starts rising, body heating power automatically reduces to retain the optimum inner temperature of WMT700.
WMT700 User Guide

4. Installation Installing WMT700
To prevent corrosion and oxidation, use copper paste or equivalent on screws and connector threads Maritime Installations
In maritime installations according to IEC 60945, WMT700 belongs to installation category
C, which means that it is exposed to weather.
When making maritime installations, note the following:
• Do not install WMT700 near a magnetic compass. The compass safe distance is 5 m.
• Do not place WMT700 directly in front of a radar.
• Do not install WMT700 next to a powerful RF-transmitter antenna Placing WMT700
Install WMT700 on one of the following:
Side of the mast
• Top of the mast
• Sensor support armor cross arm
To prevent equipment damage, install an air terminal so that the tip is as high above the instruments and sensors as possible.
When selecting the mounting position and routing the sensor cable, take into account the other equipment installed on the mast (for example, air terminals).
For the most reliable measurements:
• Avoid trees or other objects nearby which could disturb wind flow.
• Install the sensor to the height that best represents the prevailing wind conditions on site.
Chapter 4 – Installation

When deciding whereto install the sensor, pay attention to the North arrow printed on top of the sensor. The North arm is marked with an orange sticker.
If ice or snow accumulates on the mast, guy wires, or sensors, the ice or snow can fall and cause injury to persons below.
4.3 Unpacking and Handling WMT700
WMT700 is shipped in a custom cardboard container with two plastic transportation dampers. When unpacking WMT700, remove only the bottom damper that protects the sensor body.
Never transport WMT700 without the custom shipping container.
Otherwise, the warranty becomes void.
WMT700 User Guide

Figure 20 Removing WMT700 Bottom
Transportation Damper
Do not remove the upper transportation damper that protects the array until you have installed the sensor.
Handle with care. Any impact on the instrument or sensor array may cause damage and lead to incorrect measurements.
Figure 21 Handling WMT700
Chapter 4 – Installation

4.4 Connecting WMT700 Cable
When installing WMT700, route the cable according to the mounting option. When mounting to a mast, you can the route cable either outside or inside the mast. Cable routing depends on the mast type and other equipment, such as air terminals, installed on the mast.
Make sure that you prepare or connect only de-energized wires.
Do not perform installation or maintenance procedures when there is a risk of thunderstorm or lightning activity in the area.
A long cable between units (sensors, transmitters, power supplies, and displays) can cause a lethal lightning-induced current surge. Always ground the enclosure to a suitable grounded location with a short, low-resistance cable.
Make sure that the cable is properly attached to the mast or cross arm before starting the installation. Otherwise, it may slip and fall down during the installation procedure.
To avoid strain on the connector, make sure you connect the cable properly.
Too much strain may cause the cable to falloff, damage the cable or connector, or make the cable or connector susceptible to water leakage.
WMT700 User Guide

The recommended minimum bending radius for the cable is 70 mm (2.76 in. If you are using the cable tightening tool, insert the cable in the tool.
Vaisala recommends that you use the cable tightening tool. The ribbed part of the tool offers a better grip of the cable when tightening the connector. You do not need to remove the tool when the connector is tightened.
Cable tightening tool
2. If you are not using the cable tightening tool, remove the mounting adapter from the sensor body, and lead the sensor cable through the mounting adapter. Chapter 4 – Installation

3. Connect the cable to WMT700. Tighten the cable by rotating the tightening tool or the ribbed part of the connector clockwise by hand. Make sure that the connector is properly tightened before proceeding to the next step.
WMT700 Cable tightening tool
Do not use tools when tightening the connector.
To avoid water leakage and damage to the sensor, verify that the connector is properly tightened. If water leaks into the connector, this voids the warranty for the sensor.
WMT700 User Guide

4. If you removed the mounting adapter, fasten it to the sensor by rotating the adapter clockwise. Tighten the three screws at the bottom of the sensor.
4.5 Mounting WMT700 on Vertical Pole
• 5-mm Allen key
• Adjustable wrench
You can mount WMT700 on a mm (in) or a mm (in) pole mast. The
WMT70FIX mounting kit contains U bolts for both kinds of pole masts (2 pcs each).
You can place WMT700 either on the side or on top of the mast. When selecting the mounting position, take into account:
• Other equipment installed on the mast (for example, air terminal)
• Cable routing (inside or outside the mast. Make sure that the cable is firmly connected to the sensor.
Chapter 4 – Installation

2. Assemble the WMT70FIX mounting kit, and attach it to the mast with the U bolts. Figure 22 Mounting WMT700 on Side of Mast
When mounting the sensor on the side of the mast, make sure that the mounting kit is positioned at the top level of the mast.
Figure 23 Mounting WMT700 on Top of Mast. Check that the mounting kit is level, and tighten the U bolts slightly. Do not tighten the bolts too much at this stage. You still need to rotate the mounting kit to align the sensor after the installation. Haul the sensor up.
WMT700 User Guide

5. Holding the sensor from its body, run the cable through the WMT70FIX mounting kit,
and slide the sensor into the mounting kit. Chapter 4 – Installation

6. To avoid misalignment, turn the sensor until the mounting screw reaches the far end of the slot, and tighten the screw. Tightening torque 5 Nm.
WMT700 mounting screw
U-bolt and nut (M DINA) in horizontal slot. To align the sensor, rotate the mounting bracket.

Document code
Testsetup according to
More information
Optiontemperature range
Optionhardware interface
Optionunit used
Optionoutput configuration
Selectionoutput configuration
Optionadapter type
Order codedescription
Aout1 selected option
Output signal
Power supplywire colors
Used heating option
Heating option
Wire type/cable length
Descriptionspare part item
Wmt700connector pin
Open commandto activate the command, press enter
Wind_getfetches wind calibration information.more information
S command. power must be on for at least 5 seconds after the s
Startcommand.more information
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
Start stop measurement, use the stop
Wf output:wff6785672109876.5432.1k99xx5.21.2 ws425 f/g asos data messagewmt700 responds to the wa
Parameterdefault value
Id character
Wx command with a character fixed-length data message.character
Start command. to stop measurement, use thestop
Problemprobable cause
Parameter name
Analog outputs for wind direction
Itemorder code
Configuration mode / measurement
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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