aem 16470 Ultrasonic Wind Sensor
Product Information
Specifications
- Product: u[sonic] Ultrasonic Wind Sensor
- Manufacturer: LAMBRECHT meteo | AEM
- Material: Hard anodized aluminum and stainless steel
- Housing: High-quality, pollutant-resistant
- Measuring Principle: Ultrasonic run-time measurement (static)
- Protection: IP66 and IP67 rated for splash water and dustproofing
Product Usage Instructions
Advantages of u[sonic]
The u[sonic] ultrasonic wind sensor is designed for extreme environmental conditions without any moving parts. It is ideal for high wind speeds due to its robust construction made of hard anodized aluminium and stainless steel.
Warranty
Unauthorized manipulation voids the warranty. Any changes must be authorized by LAMBRECHT meteo GmbH and conducted by a qualified technician. The warranty does not cover mechanical damages from external impacts, over-voltages, improper handling, or usage beyond specified conditions.
Introduction
The u[sonic] wind sensor is compact, reliable, and meets meteorological requirements. It measures wind speed and direction using ultrasonic run-time measurement. It is housed in a splash water- and dust-proof metal casing (IP66 and IP67).
Start-up
Wind is a vector quantity represented by speed and direction. Careful selection of installation location is crucial for accurate results. Ideally, install the sensor 10m above ground on a mast away from obstructions like buildings, trees, or vehicles.
Installation Conditions
General
For precise wind measurements, ensure the sensor is installed at the correct height and location. It should be placed away from obstructions like buildings, trees, towers, and vehicles to provide representative wind conditions.
FAQ
- Q: What is the measuring principle of the u[sonic] wind sensor?
- A: The u[sonic] sensor uses ultrasonic run-time measurement, a static measuring principle without moving parts.
- Q: What are the main advantages of the u[sonic] wind sensor?
- A: The sensor is designed for extreme environmental conditions, has no moving parts, and is ideal for high wind speeds due to its robust construction.
- Q: What kind of warranty does the u[sonic] wind sensor come with?
- A: Unauthorized manipulation voids the warranty. Any changes must be authorized by LAMBRECHT meteo GmbH and conducted by a qualified technician.
u[sonic] – Advantages at a glance
The ultrasonic wind sensor u[sonic] was specially designed for extreme environmental conditions. It comes without any moving measuring elements and is ideal for high wind speeds. The extreme robust, compact sensor has a high-quality, pollutant-resistant housing made of hard anodized aluminium and stainless steel.
- Three parameters in one device: wind direction, wind speed, virtual temperature
- Without movable measuring elements
- No abrasion, low maintenance
- Standard RS 485 interface with ESD protection
- ASCII data protocol according to NMEA 0183
- Power supply (without heating) 6…60 VDC or 12…42 VAC
- Power supply (with heating) 24 V AC/DC ± 20 %
- Simple, space-saving assembly on 50 mm standard pipe
- Analog output 0…20 mA, 4…20 mA, 0…5 V or 0…10 V for wind speed and wind direction
- Heating power 60 W, 120 W, 240 W (standard)
Warranty
Please note the loss of warranty and non-liability by unauthorized manipulation of the system. You need a written permission of the LAMBRECHT meteo GmbH for changes of system components. These activities must be operated by a qualified technician.
The warranty does not cover:
- Mechanical damages caused by external impacts (e. g. icefall, rockfall, vandalism).
- Impacts or damages caused by over-voltages or electromagnetic fields which are beyond the standards and specifications in the technical data.
- Damages caused by improper handling, e.g. by wrong tools, incorrect installation, incorrect electrical installation (e.g. false polarity) etc.
- Damages which are caused by using the device beyond the specified operation conditions.
Introduction
The wind sensor u[sonic] is very robust, compact and extremely reliable. When developing this sensor particular consideration has been given to highest quality for fulfilment of meteorological requirements. The system acquires the horizontal air flow and processes the measuring data to the meteorological parameters wind speed and wind direction. The sensor is mounted in a splash water- and dust proof metal housing (IP66 and IP67) and can be immersed temporarily.
The measuring data are automatically transmitted via serial interface RS 485 in talker mode, when power supply is switched on. Due to their shock- and vibration proof construction the sensor u[sonic] is particularly qualified for use under severe environmental conditions. The housing is made of anodised seawater-resistant aluminium and stainless steel. An electronically controlled heating device enables the sensor to operate in between the wide range of -40 up to 70 °C.
ADVANTAGES OF THE STATIC MEASURING PRINCIPLE
The sensor u[sonic] is a modern system to carry out precise and reliable measurements under the hardest applications and environmental conditions. The wind measurements take place according to the principle “ultrasonic run-time measurement”, i. e. static, without moving parts.
Static measuring principle for wind measurements means:
- Determination of data works without moving measuring elements, i.e. none abrasion and least maintenance.
- The wind parameter can be measured also in winter time accurately and precisely, because of the electronically controlled heating for the immovable measuring elements. This heating is particularly effective against ice and snow in all climatic zones.
- The measuring principle enables very low threshold values, distance- and attenuation constants as well as a very high repetition accuracy.
ADVANTAGES OF THE SENSOR
- The built-in test function of the station, enabled by the tight integration of the meteorological sensors into the enclosure, can perform cyclic self-testing and notify the user of erroneous data or failure.
- The compact design of the sensor u[sonic] with 3 meteorological parameters is eliminating the installation work significantly.
Start-up
Wind can be represented by a vector quantity. For a complete description of the wind it is necessary to specify its speed and direction. The two components are subject to spatial and temporal variations; thus, strictly speaking, they are valid only for the site where the measuring instrument is installed. We therefore recommend selecting the place of installation very carefully.
Installation conditions
General
For professional wind measurements location and height of the wind sensor are important for accurate, correct results and representative wind conditions. Ideally, the sensor should be installed in 10 m above the ground on a mast. This may be buildings, trees, tall towers, lifting cranes, moving vehicles, aircrafts, helicopters and other obstructions.
In case of mobile measurements at vehicles often above mentioned conditions are not practicable. Then you have to find compromises.
Generally, wind measuring instruments should not measure the specific wind conditions of a limited area, but indicate the typical wind conditions of a wider area. The values measured at different places must be comparable. Thus, when installing the sensor you should make sure the place of installation is not under the lee of great obstacles. The distance between the obstacles and the sensor should be 10 times the height of the obstacles (this corresponds to the definition of an undisturbed terrain). If an undisturbed terrain of this kind does not exist the sensor must be put up at a height of at least 6 m above the obstacle height. If the sensor must be installed on a roof top the place of installation must be in the middle of the roof to avoid predominant wind directions. If you want to measure both wind direction and wind speed, the sensors should be avoided. The sensor u[sonic] easily meets this requirement.
The place of installation should not be in the operation fields of radar devices (radar scanners or radar transmitters), generators or antennas. We recommend a minimum distance of 2 m to these installations. Furthermore a minimum distance of 5 m to MF-/ HF- and Satcom- (e. g. Inmatsat, VSat) antennas has to be kept. The maximum electric field intensity may not exceed 10 V/m (tested according to EMC standard). When indicated a greater distance should be kept.
Tools and installation material
There are no special tools or materials required for the installation works. All work can be carried out with standard tools, e.g. Allen key size 4.
Unpacking the sensor
The sensor is delivered in separate packaging, carefully protected against mechanical impact, to avoid damage during transport.
The package contains the following items:
- Sensor u[sonic]
- User manual
Accessories: (depending on the scope of delivery, packed separately if necessary) Connection cable with cable plug
Incoming inspection
Please check the scope of delivery for completeness and possible transport damage. Please report any complaints immediately to us in writing.
Energy supply
The sensor requires at the input connector a 6…60 VDC or 12…42 VAC nominal power source for operation. For heating mode a 24 V AC/DC power supply is needed.
Current consumption
The power input of the u[sonic] is around approx. 50 mA at 24 VDC. The following table shows the maximum power input according to configured heating power.
| Heating power | Max. current consumption at 24 VDC |
| 60 W | 2.5 A |
| 120 W | 5 A |
| 240 W (standard) | 10 A |
Heating power is configured to 240 W as a standard. Other values to be configured at works on request.
Installation work (short description)
The sensor is installed in three steps:
- Mounting the cable at the sensor and if necessary draw the cable through the mast.
- Mounting the sensor at the mast, but before tightening the screws you must align the sensor to the north.
- Attaching the cable to the power supply and the signal acquisition system.
Mounting the sensor
The sensor can be installed on a standard pipe with an outer diameter of 50 mm and an inner diameter of a maximum 40 mm. Before tightening the two 8 mm socket screws and attaching the sensor you have to draw the cable through the pipe and align the sensor into driving direction. For this purpose the housing is marked accordingly (see drawing). Before the screws of the sensor are tightened, the sensor is adjusted to north. In addition the sensor has a pin for the north direction. You can put this pin into the nick at the mast (if available). If needed you can turn in or unscrew the pin by means of allen key. Please pay attention to a firm mounting of the sensor at the mast!
Sensor northing
For wind direction measurements, the north mark on the sensor must be aligned with the geographical north direction. To adjust the wind sensor in a firm and correct manner into the north direction this item is equipped with an integrated mounting aid. Inside the inner bottom of the sensor a small bolt pointing to the north is integrated to be set into a corresponding slot of the mounting pipe (if available). Thus the sensor is safely attached. If needed you can turn in or unscrew the pin by means of allen key. To set up the sensor’s north orientation select a landmark which is as far as possible up north with regard to the final position of the wind direction sensor. The reference point can be selected using a topographical map (1:25000). The exact position of the reference point is determined using an amplitude compass that can be adjusted horizontally on a stand.
Compass declination has to be considered!
To align the sensor ahead (on ships) locate a point outside the ship in the landscape which is located in the ship ahead direction respectively in the centre line or in case of the sensor is mounted far away from the middle line a line parallel to the centre line. Once the sensor is adjusted, it can be fixed with the two hexagon socket screws. Finally the earth screw has to be connected to the ship’s ground. Acid-free contact grease is recommended to protect contact surfaces against corrosion. Follow all safety instructions while setting up the sensor onto a mast.
Power supply and signal cables
An 8-pole M16 cable connector is required for the electrical connection of the sensor. The shield of the cable must be clamped to the protective earth conductor (PE) at both ends. The warranty for the device is excluded if damage occurs due to improper handling. This particularly includes the absence of proper grounding. Correct grounding according to DIN VDI/VDE 0100 is essential for the safety and functionality of the device. If you have any questions regarding installation, please contact us. The external connection is via central connector which is located in housing base. For further details about electrical connection please see chapter „Connecting diagrams“. If the sensor is mounted in correct manner and connected with the right cable (accessory), you can attach the wires to the power supply and signal outputs to data acquisition equipment (computer). The typical power supply requirements of the u[sonic] sensors are 24 VDC with a typical current drain of 50 mA. The input range is 6…60 VDC or 12…42 VAC. The heater of the u[sonic] has to be supplied with 24 V AC/DC. In standard configuration the heating power is 240 W with a current drain of 10 A at 24 VDC. The signal output of the sensors is conform to the requirements of RS422 standard in talker mode. The line drivers are capable of transmitting data over cable lengths up to 1,220 meters (4,000 feet). This maximum distance will vary depending on the quality of the used cables. When the power supply of the sensor is switched on, after 2 seconds the sensor cyclically starts sending data protocols.
Safety regulations
Because the wind sensor often is mounted on exposed locations in dangerous heights the installation personnel has to pay attention to the relevant safety regulations for such works. During the electrical installation and termination works the external circuit-breaker must be switched off. It is not permitted to open those housings by unauthorized persons!
Heating control
The integrated, intelligent heating of the u[sonic] also ensures that the sensor is kept free of ice and snow during winter operation and in locations with critical ambient conditions. On default, the heating status of the sensor is set to “On” and “Control PIN No Function”.
Different operating modes are available for controlling and monitoring the heating under moderate temperature conditions. The respective function can be set in the “u[sonic] Commander” configuration software.
Download of updates
On our homepage (https://www.lambrecht.net) you will find free firmware and the configuration software “Commander” under “Service” in the “Download Portal” in the “Free Software Tools & Firmware” section. Select the appropriate software for your product and benefit from new functions and product enhancements from LAMBRECHT meteo development after downloading
Maintenance
Regular maintenance and calibrations
The sensor u[sonic] is service reduced and designed for a very long lifetime. Recommended is a regular visual check regarding dirt of surface caused by the weather and if so, to clean up. If reference measurements should be necessary stringently must be noted that a comparability of the measured values is given only if the measurements take place under same conditions. I.e. the reference equipment must be used very close to the sensor! The sensor is a measuring instrument and thus apply user specific standards regarding period of recalibration. Recommendation: 2 years.
Visual inspections and cleaning
The use of the sensor under the respective environmental conditions requires certain steps. It is thus recommendable to clean the outside of the housing within specific intervals. The intervals are dependant on the environmental conditions and the degree of soiling. We recommend a regular sight check. In case you should be faced with any specific problems please contact the Lambrecht service under:
- Tel: +49 (0)551 49580 or
- E-Mail: support@lambrecht.net
Transports
In case the sensor should be shipped or transported by you, it has to be packed securely to avoid mechanical impact or other damage.
Disposal
LAMBRECHT meteo GmbH is listed and registered at the Stiftung Elektro-Altgeräte Register ear under:
WEEE-Reg.-Nr. DE 45445814
In the category of monitoring and control instruments, device type: “Monitoring and control instruments for exclusively commercial use”.
Within the EU
The device has to be disposed according to the European Directives 2002/96/EC and 2003/108/EC (Waste Electrical and Electronic Equipment). Do not dispose the old device in the household waste! For an environmentally friendly recycling and disposal of your old device, contact a certified disposal company for electronic waste.
Outside the EU
Please follow the regulations in your country regarding the appropriate disposal of waste electronic equipment
Pin assignment
| Pin assignment | ||
| Pin | Color | Cross-section [mm²] |
| 1 | black | 0,25 |
| 2 | brown | 0,25 |
| 3 | red | 0,25 |
| 4 | orange | 0,25 |
| 5 | yellow | 0,25 |
| 6 | green | 0,25 |
| 7 | blue | 1 |
| 8 | violet | 1 |
Dimension
Dimensional drawing and connection diagram
| 00.16470.100000 | ||||
| Pin | Pin assignment RS 485 | Pin assignment RS 422 | Pin assignment SDI-12 | Cable color 32.16470.060000 |
| 1 | Wind speed (analog) | Rx- | Wind speed (analog) | black |
| 2 | Data- | Tx- | + Data I/O SDI-12 | brown |
| 3 | Heating Control
(configurable) |
Heating Control
(configurable) |
Heating Control
(configurable) |
red |
| 4 | Wind direction (analog) | Rx+ | Wind direction (analog) | orange |
| 5 | Data+ | Tx+ | – GND SDI-12 | yellow |
| 6 | AGND | AGND | AGND | green |
| 7 | + 24 V AC / DC nominal | + 24 V AC / DC nominal | + 24 V AC / DC nominal | blue |
| 8 | – 24 V AC / DC nominal | – 24 V AC / DC nominal | – 24 V AC / DC nominal | violet |
NMEA data protocols
NMEA COMMUNICATION PARAMETERS
Baudrate: 4800 Baud
Data Bits: 8
Parity Bit: None (none)
Stop Bits: 1 (or more)
Handshake: without
WIND DIRECTION AND WIND SPEED
Example of data sequence with comma separated fields: $WIMWV,357.0,R,5.2,M,A*CS<CR><LF>
field delimiter: , (comma)
header: $WIMWV
wind direction: 0.0…360.0
R: relative wind direction
wind speed: 0.1…85.0
M metric units m/s
status A (valid) / V (not valid)
stop delimiters: <CR> <LF>
error code: WD 999.9
error code: WS 999.9
MESSAGE STRING WIMTA AIR TEMPERATURE
Example of data sequence with comma separated fields: $WIMTA,-25.0,C*CS<CR><LF>
field delimiter: , (comma)
header: $WIMTA
temperature: -40.0…+70.0
C: °C
stop limiters: <CR> <LF>
error code: 999.9
REMARK
The development of a NMEA decoder should not be proceeded from firm field lengths. The NMEA definition proceeds from a variable field length. The comma character (‘,’) serves as field disconnecting switch. Numeric values in a field can be represented differently.
In case a field is not sent, it has a length of 0 characters ( ,,).
The check sum „CS“ is covered to two ASCII characters hexadecimal value. „CS“ calculated by XOR operation of each characters in the Sentence between „$“ and „*“, but excluding „$“ and „*“.
- <CR> carriage return (hex0D)
- <LF> linefeed (hex 0A)
Further protocols available on request
Modbus protocol
Note: Modbus must be configured in default.
This manual covers the general Modbus specification common to all Modbus sensors from LAMBRECHT meteo. The manual allows easy operation of all LAMBRECHT meteo Modbus sensors. Some sensors of the Modbus family offer additional registers and functions, which are described in separate documents via the registers and functions described here. The registers and functions described in this manual are sufficient for general operation of Modbus sensors in a weather station or PLC.
General
The LAMBRECHT meteo Modbus sensors follow the specification of the Modbus organization: “MODBUS APPLICATION PROTOCOL SPECIFICATION V1.1b3” (see www.modbus.org).
Data encoding
MODBUS uses the “Big-Endian” format for addresses and data. This means that if a value is transmitted with a number format which is larger than a single byte, that the “most significant byte” is sent first.
Example Big-Endian:
Register size value 16 – bits
0x1234 is transmitted in the sequence: 0x12 0x34. To obtain the real measuring value, divide the received register value by the divisor. Values of -9999 indicate an internal sensor error.
Standard configuration – Default
- Baud rate: 19200 Baud
- Byte frame: 8E1 (1 start bit, 8 data bits, 1 parity bit (even parity), 1 stop bit)
- RTU Sensor address: 9
DEFAULT ADDRESSES OF THE LAMBRECHT SENSORS
| Address | Sensor |
| 1 | Wind speed |
| 2 | Wind direction |
| 3 | Precipitation rain[e] |
| 4 | THP |
| 5 | EOLOS IND; u[sonic]WS6 |
| 6 | com[b] |
| 7 | PREOS |
| 8 | ARCO |
| 9 | u[sonic] |
| 10 | Pyranometer 2nd Class |
| 11 | Secondary standard Pyranometer |
| 12 | PT100 ot Modbus converter (temperature) |
| 13 | u[sonic]WS7 |
Available Modbus commands
The LAMBRECHT Modbus sensors support the following commands:
- “Read Holding Register” command: 0x03 (descriptive sensor data registers)
- “Read Input Register” command: 0x04 (measured values registers) (every measured value is to be requested individually)
- “Write Multiple Register” command: 0x10 (Write to configuration registers)
Instantaneous values / real-time values ( Input Registers)
The following measured values are provided by the LAMBRECHT meteo sensors
| Register address | Parameter name | Unit | Divisor | Quantity of registers | Access type |
| 30001 | Wind speed | m/s | 10 | 1 | Read only |
| 30201 | Wind direction | ° | 10 | 1 | Read only |
Example: Retrieving the wind speed
Period data – Average, maximum and minimum (Input Registers)
| Register | Parameter name | Unit | Divisor | Quantity of registers | Access type |
| 30002 | Wind speed average | m/s | 10 | 1 | Read only |
| 30003 | Wind speed maximum | m/s | 10 | 1 | Read only |
| 30004 | Wind speed minimum | m/s | 10 | 1 | Read only |
| 30202 | Wind direction average | ° | 10 | 1 | Read only |
| 30203 | Wind direction maximum | ° | 10 | 1 | Read only |
| 30204 | Wind direction minimum | ° | 10 | 1 | Read only |
The data are valid for the period between the current request and the previous request. The maximum range of a period is 1 hour. Recalling the average value of a minimum, maximum and average group will erase the appropriate registers. Retrieve the values of a group in the sequence minimum, maximum, average.
Use command: 0x03
Example: Retrieve wind speed (min. max. avr.) and erase the register content
Descriptive sensor parameter registers ( Holding Registers)
| Register | Parameter name | Quantity of registers | Remark | Access type |
| 40050 | Device identification number
(15 characters) |
8 (2 characters in each register) | The returned data are in form of a 16 byte null terminated string | Read only |
| 40100 | Serial number (11 characters) | 6 (2 characters in each register) | The returned data are in form of a 12 byte null terminated string | Read only |
| 40150 | Firmware version (up to 25 characters) | 13 (2 characters in each register) | The returned data are in form of a 26 byte null terminated string | Read only |
Example: Retrieve the device identification number
(The identification number shown in the example is sensor-dependent. It is only used here for demonstration purposes).
Configuration registers (Holding Registers)
| Register | Parameter name | Allowed values | Quantity of registers | Access type |
| 40001 | Modbus device address | 1 | Write only | |
| 40200 | Baud rate | 96 = 9600
192 = 19200 384 = 38400 |
1 | Write only |
| 40201 | Parity | 1 = even
0 = none |
1 | Write only |
The device must be restarted after each change of a setting!
Example: Changing the RTU address from 4 to 1
Autoconfiguration
All Lambrecht Modbus sensors offer the experienced user the possibility to implement an auto-configuration in his Modbus master based on additional information stored in the sensor. The necessary information can be found in the document “Lambrecht_Modbus_Autoconfiguration”.
SDI-12 Interface
SDI-12 has to be preconfigured ex works.
Please specify when ordering: Id-No. 97.16470.000002 Configuration SDI-12 The communication using SDI-12 protocol via SDI-12 interface is based on the ‘SDI-12 A Serial-Digital Interface Standard for Microprocessor-Based Sensors, Version 1.4, 2017’. The u[sonic] can be used in bus mode parallel to other u[sonic]. The following subset of SDI-12 commands were implemented into the u[sonic]. For more information on the SDI-12 protocol, please refer to the standard documentation mentioned above or the
website www.SDI-12.org.
IMPLEMENTED S DI-12 C OMMANDS
| Command | Function | Sensor response |
| a! | Acknowledge Active | a<CR><LF> |
| aI! | Send Identification | alcove…xx<CR><LF> |
| aAb! | Change Address | b<CR><LF> |
| aM! | Start Measurement | atttn<CR><LF> |
| aMC! | Start Measurement and Request CRC | atttn<CR><LF> |
| aC! | Start Concurrent Measurement | atttnn<CR><LF> |
| aCC! | Start Concurrent Measurement and Request CRC checksum | atttnn<CR><LF> |
| aD0! | Send Data (Buffer 0) | a<Werte<CR><LF> a<Werte><CRC><CR><LF> |
| aV! | Start Verification | atttn<CR><LF> |
| aX! | Resetting the Addresses | a<CR><LF> |
- a = Address of the corresponding sensor
- Standard sensor addresses = 0
SDI-12 commands always start with the address of the appropriate sensor. Therefore all other sensors on the same bus will ignore these commands. SDI-12 commands end with ‘!’. All answers from sensors start with its address, too, but end with the ASCII characters ‘Carriage Return’ <CR> and ‘Line Feed’ <LF>.
The SDI-12 protocol is based on the ASCII character set. The baud rate of the SDI-12 protocol is 1200 Bd and has the byte frame format:
- 1 start bit
- 7 data bits (least significant bit transmitted first)
- 1 parity bit (even parity)
- 1 stop bit
Acknowledge Active – a!
This command ensures that the sensor responds to requests. Basically it asks the sensor to confirm that it is connected to the bus.
The sensor returns its address and <CR><LF>.
Syntax
Send Identification – aI!
The command aI! is used to ask the sensor for its model number and firmware version.
Syntax
Change address – aAb!
The factory setting for the address is “0”.If there are several sensors connected to one bus, the sensor address can be changed with the command aAb!. The address is always a single ASCII character. Standard for addresses are the ASCII characters “0” to “9” (decimal 48 to 57). If there are more than 10 sensors connected to one bus, using the characters “A” to “Z” (decimal 65 to 90) and “a” to “z” (decimal 97 to 122) is allowed. The sensor answers with its new address and <CR><LF>. After the address is changed, one should not send further commands to the sensor for a period of one second (see also “SDI-12 Standard, Version 1.4, 2017”).
Syntax
Start Measurement – aM!
The command aM! requests that the sensor processes the returning string and provide the available measured data. In contrast to standard sensors described in the SDI-12 documentation the [u]sonic measures continuously. Thus the measured values from the continuous measurement are stored in a buffer while the string is being processed. These values are processed after the string processing. Therefore the [u]sonic always responds with “a000”. This is also the reason why the [u]sonic does not send a “Service Request” and ignores signals to interrupt the measurement. Prior to the returned waiting time the data logger must not send further commands. After expiration of the waiting time the data can be requested with the commands aD0! and aD1! (see Send Data). The data will not be overwritten until the next C, M, or V command and can be read several times until then.
Syntax
The measured data can be requested with the commands aD0! and aD1!. (see Send Data).
Start Measurement and Request CRC – aMC!
Same command as aM! but in addition to the generated data the sensor returns a 3-digit CRC checksum. For information on how the CRC checksum is generated, please consult “SDI-12 Standard, Version 1.3, 2012, chapter 4.4.12”.
Syntax
Start Concurrent Measurement – aC!
The “Concurrent Measurement” enables the data logger to measure simultaneously with multiple sensors on the same bus. The “aC!” command requests the sensor to process the available measurement data and write them to an output string. Unlike the standard sensors described in the SDI-12 documentation, the u[sonic] measures continuously. This is why the u[sonic] always responds with “a000”. The data is therefore immediately available. This is also the reason why the u[sonic] does not send a “service request” and ignores measurement interruption commands. The data can be retrieved with the command “aD0!” (see below under “Send data”). The data is not overwritten until the next “C” or “M” command and can be retrieved several times.
Syntax
The measured data can be requested with the command aD0! (see “Send Data”).
Start Concurrent Measurement with CRC – aCC!
Same command as “aC!” but in addition to the generated data the sensor returns a 3-digit checksum. For information on how the CRC checksum gets generated, please consult ‘SDI-12 Standard Version 1.4, 2017, chapter 4.4.12’.
Syntax
Send Data – aD0!
The data requested by the sensor with the commands “C” or “M” can be retrieved with the command “aD0!”. The sensor uses the corresponding signs (“+” or “-”) as field separators. If the data was requested with a “CC” or “MC” command, a CRC checksum is also returned. For more information on how to generate this CRC checksum, please see “SDI-12 Standard, Version 1.4, 2017, chapter 4.4.12”.
After the measurement, the data is stored in the buffer “D0” and retrieved with the command “aD0!”.
Syntax for measurements with aCC! or aMC!
Definition SDI-12 u[sonic] C! and CC!
| Nr. | Parameter | Description | Unit | |
| D0! | 1 | Wind speed | Instantaneous value | m/s |
| 2 | Wind speed | Minimum value | m/s | |
| 3 | Wind speed | Maximum value | m/s | |
| 4 | Wind speed | Average value | m/s | |
| 5 | Wind direction | Instantaneous value | deg | |
| 6 | Wind direction | Minimum value | deg | |
| 7 | Wind direction | Maximum value | deg | |
| 8 | Wind direction | Average value | deg | |
| D1! | 9 | Acoustic virtual temperature | Instantaneous value | °C |
| 10 | Acoustic virtual temperature | Minimum value | °C | |
| 11 | Acoustic virtual temperature | Maximum value | °C | |
| 12 | Acoustic virtual temperature | Average value | °C | |
| D2! | 13 | Status code | 16 bit value | |
| 14 | Error code | 16 bit value |
Minimal, maximum and average value refer to the time since last C! or CC! command.
Syntax for measurements with command “aC!” or “aM!”
Error/status code
The returned value is a decimal format of an originally binary number.
In binary notation, the digits correspond to the following error messages.
Error:
Status:
Description for aM! and aMC!
| No. | Description | |
| D0 | 1 | windspeed.mom |
| 2 | winddirection.mom | |
| 3 | virtual_temperature.mom |
Technical data
| Combined Ultrasonic Wind Sensor u[sonic] | |
| ID | 00.16470.100000
Modbus and SDI-12 are pre-configured ex-works. Please specify when ordering: ID 97.16470.000001 Configuration Modbus ID 97.16470.000002 Configuration SDI-12 |
| Measuring principle | ultrasound |
| Measuring range | wind direction: 0…359.9°; wind speed: 0…75 m/s |
| Survival wind speed | 100 m/s |
| Accuracy | wind direction: < 2° (> 1 m/s) RMSE wind speed: 0.2 m/s RMSE (v < 10 m/s); 2 % RMSE (10 m/s < v < 65 m/s) |
| Resolution | wind direction: 0.1°
wind speed: 0.1 m/ |
| Response threshold | 0.1 m/s (adjustable for wind direction) |
| Outputs | RS 485; analog: 4…20 mA; (0…65 m/s); (other scalings on request)
(Outputs on request: RS 422; SDI-12; analog: 0…20 mA; 0…5 V; 0…10 V) |
| Protocols | NMEA 0183; WIMWV; WIMTA
(Protocols on request: SDI-12; Modbus RTU) |
| Measuring rate | 0.1…10 Hz; (internal measuring rate 50 Hz) |
| Operating conditions | -40…+70 °C (with heating -50…+70 °C); 0…100 % r. h. |
| Supply voltage | without heating: 6…60 VDC oder 12…42 VAC; with heating: 24 V AC/DC ± 20 % |
| Current consumption | sensor: typically 50 mA at 24 VDC and deactivated analog output; heating: maximal 10 A at 24 V AC/DC |
| Heating data | factory configurable: 60 W / 120 W / 240 W (standard) |
| Dimensions | Ø 199 mm; height 149 mm |
| Housing | seawater resistant aluminum; IP 66; IP 67 |
| Weight | approx. 2 kg |
| Standards | • NMEA 0183
• VDE 0100 • Low voltage guide line: 72/23 EWG • EMC/ EMI: DIN EN 60945 and DIN EN 61000-4-2, -3, -4, -5, -6, -11 • Protection class: DIN EN 60529 |
| Accessories (please order separately) | |
| ID 32.16470.060000 | Sensor cable; 15 m; 8-pole; M16 plug |
Copyright © 2024 LAMBRECHT meteo GmbH. All rights reserved. Information in this document is subject to change without notice.
Contact
- LAMBRECHT meteo GmbH Friedländer Weg 65 37085 Göttingen Germany
- Tel+49-(0)551-4958-0
- Fax +49-(0)551-4958-312
- E-Mail info@lambrecht.net
- Internet www.lambrecht.net
Documents / Resources
 |
aem 16470 Ultrasonic Wind Sensor [pdf] User Manual 16470, 16470 Ultrasonic Wind Sensor, Ultrasonic Wind Sensor, Wind Sensor, Sensor |