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Aanderaa Data Instruments AS – TD302

CHAPTER 1

Short description and specifications

In most measuring systems used in the sea, pressure is a vital parameter to derive other parameters like the
water density and the speed of sound. For deep water moorings the pressure can be used to determine the
actual depth of the instrument. For fixed installations on the seabed the pressure can be used for deriving the
water level and wave parameters.
The Pressure sensor, Tide sensor and the Wave and Tide sensor are compact yet intelligent sensors designed for
use on Aanderaa SeaGuard and SmartGuard as well as in other measuring systems. These sensors measure the
absolute pressure based on a silicon piezoresistive bridge. The pressure measurements are sampled and
temperature compensated by an advanced Digital Signal Processor. A temperature thermistor is located next to
the pressure bridge,

Since all calibration and raw data are stored inside the sensor, the parameters can be presented directly in
engineering units without any external calculations.
The output formats of the 4117, 5217, and 5218 are AiCaP and RS-232, while the output format of the 4117R,
5217R, and 5218R are RS-422. The sensors can be used in polled operation when set to Smart Sensor Terminal
mode.
The 4117, 5217, and 5218 version fits directly on to the top end plate of Aanderaa

SeaGuard Platform. The

sensor is then used in AiCaP mode. When used with SmartGuard both AiCaP and RS-232 mode can be used. The
sensors may also be used as a stand-alone RS-232 sensor for other applications.
The R-versions (4117R, 5217R, and 5218R) cannot be used on a

SeaGuard platform. This sensor is for use with

SmartGuard or as stand-alone RS-422 sensor on longer cables.
The first letter in the product number gives the maximum deployment depth for the sensor, refer datasheet for
more info.

IMPORTANT!

A 4117, 5217, and 5218 sensor cannot be made into an R-version, and a 4117R, 5217R, and 5218R sensor
cannot be made into a AiCaP or RS-232 sensor after delivery.

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Содержание 4117

Страница 1: ...TD 302 OPERATING MANUAL PRESSURE SENSOR 4117 4117R TIDE SENSOR 5217 5217R WAVE TIDE SENSOR 5217 5217R January 2014 PRESSURE SENSOR 4117 4117R TIDE SENSOR 5217 5217R WAVE AND TIDE SENSOR 5218 5218R ...

Страница 2: ...on including general updates in text Rebranded Frame Work 3 update please refer Product change notification AADI Document ID DA 50009 01 Date 09 December 2011 ref Appendix 6 3rd Edition 14 January 2014 New property Installation Depth added for Tide sensors effective version 8 1 1 Copyright Aanderaa Data Instruments AS ...

Страница 3: ...Sensor 5217 5217R 16 1 5 3 Additional sensor properties for Wave and Tide Sensor 5218 5218R 17 1 6 Specifications 17 1 7 Manufacturing and Quality Control 18 CHAPTER 2 Measurement Principles and Parameters 19 2 1 Sensor Integrated Firmware 19 2 2 Calculated parameters 20 2 3 Status codes 21 2 4 Startup delay for calculated wave and tide parameters 22 CHAPTER 3 Current drain 23 3 1 Pressure sensor ...

Страница 4: ...figuration of the Tide Sensor and Wave and Tide Sensor 47 7 2 Smart Sensor Terminal communication setup 48 7 2 1 Polled Mode 48 7 2 2 Sensor startup 48 7 2 3 Smart Sensor Terminal protocol 49 7 2 4 Passkey for write protection 50 7 2 5 Save and Reset 51 7 2 6 Available commands 52 7 2 7 The Get command 53 7 2 8 The Set command 53 7 2 9 Formatting the output string 54 7 2 10 XML commands 55 7 3 Exa...

Страница 5: ...4117 4117R Tide 5217 5217R Wave Tide 5218 5218R Page 5 Appendix 3 Calculating engineering values from raw data 62 Appendix 4 Calculations of wave parameters 5218 5218R 64 Appendix 5 Illustations 73 Appendix 6 Product change notification Frame Work3 78 ...

Страница 6: ...ensors See Appendix 6 Pressure Sensor 4117 Tide Sensor 5217 and Wave Tide Sensor 5218 is designed to fit directly on the top end plate of SeaGuard or in a string system connected to SmartGuard or SeaGuard String logger using AiCaP The sensor can also be used as stand alone sensor using RS 232 Pressure Sensor 4117R Tide Sensor 5217R and Wave Tide Sensor 5218R are only RS 422 output and are intended...

Страница 7: ...7 5217R 5218 5218R D362 Data Sheet for Pressure Sensor 4117 4117R D405 Data Sheet for Tide Sensor 5217 5217R D407 Data Sheet for Wave and Tide Sensor 5218 5218R TD 277 Calculation of current drain for the Pressure Sensor Tide Sensor and Wave and Tide Sensor Abbreviations ADC Analog to Digital Converter AiCaP Aanderaa Protocol Automated idle Line CANbus Protocol ASCII American Standard Code for Inf...

Страница 8: ...nce all calibration and raw data are stored inside the sensor the parameters can be presented directly in engineering units without any external calculations The output formats of the 4117 5217 and 5218 are AiCaP and RS 232 while the output format of the 4117R 5217R and 5218R are RS 422 The sensors can be used in polled operation when set to Smart Sensor Terminal mode The 4117 5217 and 5218 versio...

Страница 9: ...r Pressure 4117 4117R Tide 5217 5217R Wave Tide 5218 5218R Page 9 Figure 1 1 Illustration of sensor Figure 1 2 Pin Configuration for 4117 5217 and 5218 with AiCaP and RS 232 Figure 1 3 Pin Configuration for 4117R 5217R and 5218R with RS 422 ...

Страница 10: ...he Pin Configuration Signal Description CAN_H CANbus line dominant high NCG Node Communication Ground NCR Node Communication Request Gnd Ground Positive supply 6 14V positive supply NCE Node Communication Enable BOOT_EN Boot Load Enable do not connect CAN_L CANbus line dominant low RS 232 RXD RS 232 Receive line RS 232 TXD RS 232 Transmit line RS 422 TXD RS 422 Transmit signal non inverting output...

Страница 11: ...e set used to filter out waves is separate from that used to calculate wave statistics Refer chapter 1 3 for a description of the Tide sensor and 1 4 for a description of the Wave Tide sensor The main objective of the temperature reading is to temperature compensate the pressure reading AADI offers other sensors designed to measure the water temperature more accurately if required 1 3 Tide measure...

Страница 12: ...of the water Pressure is set to 0 Salinity is set by the user If you can find precise values for the input parameters at the deployment site the sensor will calculate the tide level more accurately If Patm can be measured at the site the tide level can be calculated more accurately by means of post processing The user of an R version sensor can update the property Patm on request Patm will not be ...

Страница 13: ... the salinity4 of the water Pressure is set to 0 The salinity is configured by the user If you can find precise values for the input parameters at the deployment site the sensor will calculate the tide more accurately The Distance to seafloor is the distance between the sensor and the sea floor This distance must be set by the user so that the sensor software selects the correct transfer function ...

Страница 14: ...es will be controlled by the instrument refer Table 1 2 1 5 1 Sensor properties for Pressure sensor 4117 4117R Table 1 2 Sensor properties for Pressure sensor FC Factory Configuration UM User Maintenance SC System Configuration DS Deployment Setting ENUM Enumeration INT Integer BOOL Boolean yes no Property Type No of elements Use Configuration Category Access Protection RS232 422 applications Prod...

Страница 15: ...ll wait for a Do Sample command Enable Text BOOL 1 Controls the insertion of descriptive text i e parameter names Enable Decimalformat BOOL 1 Controls the use of decimal format in the output string Node Description String 31 User text for describing node placement etc UM High Owner String 31 User setting for owner Interface ENUM 1 Factory use only RS232 for standard version RS422 for R version Bau...

Страница 16: ... Type No of elements Use Configuration Category Access Protection RS232 422 applications Air Pressure Float 1 Nominal air pressure DS No Local gravity Float 1 Set the local gravity Salinity Float 1 Set the salinity at the deployment site Installation Depth Float 1 Installation depth in meter relative to chosen datum by default set to zero instrument referred DS Low Enable Tide BOOL 1 Enable Tide o...

Страница 17: ...he sensor and the seafloor Installation Depth Float 1 Installation depth in meter relative to chosen datum by default set to zero instrument referred DS Low Enable Wave BOOL 1 Enable Wave output parameters SC Low Number of samples ENUM 1 Set the number of samples 256 512 1024 2048 Enable Tide BOOL 1 Enable Tide output parameters Tidal Average Period ENUM 1 Set the averaging interval for the tide m...

Страница 18: ...ruments products have a record for proven reliability With over 40 years experience producing instruments for use in demanding environments around the globe you can count on our reputation of delivering the most reliable products available We are an ISO 9001 Certified Manufacturer As a company we are guided by three underlying principles quality service and commitment We take these principles seri...

Страница 19: ...rmware based on these raw data and referred to sets of calibration coefficients stored in the sensor All pressure transducers have a temperature drift By calibrating the sensor at different temperatures this drift can be determined The DSP stores the data from the calibration and is thus able to temperature compensate sampled pressure data as well as to convert the data into linearly calibrated da...

Страница 20: ...tion of wave parameters Table 2 1 Calculated Sensor parameters Parameter Unit Pressure sensor 4117 4117R Tide sensor 5217 5217R Wave and Tide sensor 5218 5218R Pressure kPa x x x Temperature C x x x Tide pressure kPa x x Tidelevel m x x Significant wave height m x Maximum wave height m x Mean period s x Peak period s x Energy wave period s x Mean zero crossing period s x Steepness x Irregularity o...

Страница 21: ...s containing errors are marked with red text The status field will have a Common status code The Common status code indicates whether there exist problems within the data set By right clicking the Status field details and the status codes for each parameter will be shown In addition to the listed status codes from the sensor the SeaGuard platform and SmartGuard logs status codes for communication ...

Страница 22: ...ted after Tidal Average Period in seconds Wave parameters will be calculated after rate Sampling samples of Number seconds The sampling rate is by default 2 Hz but you can enable high sampling rate of 4 Hz refer Table 1 3 and Table 1 4 Note The pressure time series is cleared after sensor power up the Reset and Start command and a change in the properties Interval Enable high sample rate Tidal Ave...

Страница 23: ...ly Other factors that influence the current drain The total number of enabled output parameters Note Refer TD277 for a spread sheet calculating the current drain The current drain will increase when the sensor is connected to a lower voltage power supply less than 9V 3 1 Pressure sensor 4117 4117R The pressure sensor current drain depends on the output interval S and the sensor operation mode refe...

Страница 24: ...e sensor power consumption is similar to the power consumption of the Pressure sensor 4117 4117R refer chapter 3 1 Table 3 2 Power consumption of the Tide Sensor 5217 5217R when Enable Tide is Yes and the assumptions stated in the beginning of Chapter 3 are true Operation Mode Current drain 9V T S 1 T S 1 AiCaP 0 4 mA 2 2 Fs T S mA Fs 2 Hz 4 65 mA 1 5 S mA Fs 4 Hz 9 2 mA 1 5 S mA RS 232 0 4 mA 2 5...

Страница 25: ...mption is similar to the power consumption of the Tide Sensor refer chapter 3 2 IMPORTANT If both Enable Wave and Enable Tide are Yes both Wave and Tide output parameter are enabled then the correct power consumption will be the greater of the consumption given in Table 3 2 and Table 3 3 Table 3 3 Power consumption of the Wave Sensor 5218 5218R when Enable Wave is Yes Enable Tide is No and the ass...

Страница 26: ...easurements Low water levels require more internal calculations If the water level becomes less than 0 25 meters the water level will be set to 0 25 meters The data quality of the wave measurements is reduced with increasing installation depth due to wave attenuation refer Appendix 4 The pressure variations generated by waves are damped and the cut off frequency reduces the frequency range in the ...

Страница 27: ...em Note This chapter describes the installation and the SeaGuardConfiguration of the Pressure sensor Tide sensor and the Wave and Tide sensor Refer TD262a for a thorough description of configuring the SeaGuard Instrument and to perform Node Identification more Deployment settings Recorder settings and to view edit sensor calibration coefficients 5 1 Installation on SeaGuard platform The Pressure S...

Страница 28: ...ace in the sensor mounting hole is clean and smooth and check also that the O rings at the sensor foot are free from dust and particles and greased with silicon grease Align the orientation pin in the sensor foot with the orientation hole in the top end plate and carefully insert the sensor When fully seated on the top end plate tighten the set screw with only moderate force Note Always replace O ...

Страница 29: ...eminc com RS 422 A watertight free end cable 4763 and non watertight free end cable 3880 is available for connection to third party data logger See Appendix 5 Figure A 10 and Figure A 11 For set up and configuration use Sensor Cable 4799 See Appendix 5 Figure A 8 5 3 Sensor Configuration Pressure sensor 4117 Note Refer to Table 1 2 for a description of the sensor settings and the input parameters ...

Страница 30: ...play refer Figure 5 4 Press Finish to store the settings when complete 5 3 2 Deployment Settings The Deployment Settings hold a list of user defined inputs location geographic position vertical position and reference To add information to one of these properties select the property press View Edit and with the keyboard panel enter the text or numbers Press OK and Finish storing the information 5 3...

Страница 31: ...g with multiple sensors connected renaming the sensor can facilitate analyzing data The text is by default set to the product name followed by product model and serial number e g Pressure Sensor 4117 52 Press Next to continue with the next submenu Figure 5 6 Node Description The second submenu is the Owner property press View Edit in the lower part of the window and change the text Press Save to s...

Страница 32: ...arameters 5 4 1 System configuration Open the System Configuration from the Menu button Select the Tide Sensor from the list of sensors and tap Configure in the lower part of the window The System Configuration holds output parameters which can be set by the user refer Figure 5 9 Select the property and press View Edit to set the value Tap OK to return to list Press Finish to store the measurement...

Страница 33: ...ct the property press View Edit and with the keyboard panel enter the text or numbers Press OK and Finish storing the information The Deployment Settings 2 2 holds a list of fixed parameters that must be valid at the deployment site refer chapter 1 3 and 1 4 for a short description Atmospheric Pressure Local Gravity Acceleration Salinity Type the value in the input field using keypad panel The par...

Страница 34: ... Rate if you select No the sampling rate will be 2Hz If Yes the sampling rate will be 4Hz For property Enable Temperature and Enable Rawdata If set to Yes the parameter will be included in the dataset if set to No the data will not be stored or displayed Figure 5 11 System Configuration measurement settings For property Enable Tide and Enable Wave The sensor will act as a Pressure Sensor if both a...

Страница 35: ...e in the input field using keypad panel The parameters are used in calculating the wave and tide parameters At delivery these parameters are set to 101 3 kPa Ambient Air Pressure 9 81 m s2 Local Gravity 35 0 psu Salinity and 0 m Distance to Seafloor Press Finish to store the settings when complete 5 5 3 User Maintenance Open Administrative Tools from the Menu button Select User Maintenance and the...

Страница 36: ... renaming the sensor can facilitate analyzing data The text is by default set to the product name followed by product model and serial number e g Wave and Tide Sensor 5218 52 Press Next to continue with the next submenu Figure 5 14 Node Description The second submenu is the Owner property press View Edit in the lower part of the window and change the text Press OK to store the setting when complet...

Страница 37: ...arge part of the storage capacity Pressure time series spectrum should only be recorded in special occasions Figure 5 16 Enable Pressure Series and Spectrum The fourth submenu is the Calibration Coefficients property For each calibration property to be set you must first select the property then press View Edit and type the correct value Press Save to store the settings Press Finish to complete an...

Страница 38: ...User Maintenance to view maintenance settings The password is 1000 Figure 6 1 AADI Real Time Collector screen views User accessible sensor properties are found in Deployment settings System Configuration and User Maintenance Refer Table 1 2 Table 1 3 and Table 1 4 in chapter 1 for an overview of the properties and the chapter 1 text for a description of sensor properties To edit the configuration ...

Страница 39: ...January 2014 TD 302 Operating Manual for Pressure 4117 4117R Tide 5217 5217R Wave Tide 5218 5218RPage 39 Figure 6 2 Sensor deployment settings Figure 6 3 Sensor system configuration ...

Страница 40: ...Page 40 Aanderaa Data Instruments AS TD302 Figure 6 4 Sensor user maintenance part 1 Figure 6 5 Sensor user maintenance part 2 ...

Страница 41: ...isualization Figure 6 6 showing real time data from sensor obtained via the data visualization tool in Real time Collector This data can either be displayed in the text viewer as shown in figure 6 6 or in graphs by using the graph viewer For more info on this feature refer to TD268 AADI Real Time collector operating manual ...

Страница 42: ...figuration as Cable 4865 Either connect the additional USB plug in a USB port for providing power to the sensor the USB port normally gives 5V power or connect the USB plug to an included extension of the USB and connect to external power 5 14V refer Figure 7 1 Note If power cannot be obtained from an USB port a practical solution is to use a 9V alkaline battery 6LF22 to set the sensor up or log d...

Страница 43: ...5 4865 3 Open a terminal emulation program on your PC copy and paste or write a text file in an ordinary text editor the command lines and save this file This file can then be sent to the sensor in one operation The first line in the example below is a user comment line that is disregarded by the Sensor Strings starting with either or are ignored by the software and do not produce any errors nor a...

Страница 44: ... less influenced by external noise than a sensor with RS 232 serial communication which makes it possible to communicate using longer cables in RS 422 operations RS 422 has one balanced signal pair for the transmitted signal TxD also called TxD and TxD and one balanced signal pair for the received signal RxD also called RxD and RxD RxD and TxD are often named B and called non inverting input and o...

Страница 45: ...lculation of output parameters The temperature measurement is updated at sensor power up clearing of the pressure series and at a 10 min interval After sensor start up or clearing of the pressure series some time will elapse before the required number of pressure samples are available hence wave and tide parameters cannot be calculated The parameters will be set to 0 and there will be a status cod...

Страница 46: ...r sleep mode between recordings calculations Setting No is not recommended for battery operation as the current drain will rise by up to 9mA continuous The accuracy of the temperature readings will also be reduced and may not meet published accuracy specification with this setting due to internal self heating The Interval property describes the output interval in seconds stand alone sensor The val...

Страница 47: ...ng Wave and Tide Sensor Set the Number of Samples to be collected for wave calculations refer chapter 1 3 Wave and Tide Sensor Wave parameters are calculated with better accuracy if the number of pressure samples is high If you select 2048 samples the sensor averages two frequency spectrums each of 1024 samples Set the property Enable Spectrum to Yes to present the spectrum elements in the output ...

Страница 48: ...nd a Line Feed after each Carriage Return RS 232 RS 422 operation When connected you will get measurement data according to the output interval stored in the flash memory If the measurement interval is set to zero you can type the command Reset to get the operation mode and a single set of measurement data 7 2 1 Polled Mode Type a command to retrieve data information from the sensor refer e g chap...

Страница 49: ...ctivation When Comm TimeOut is set to Always On the communication and microprocessor will be kept active all time The Communication Sleep Indicator and the Communication Ready Indicator are not followed by Carriage Return and Line Feed The character indicates that communication with the sensor is not possible shut down refer third line in the screen dump presented in Figure 7 4 In this mode the el...

Страница 50: ...code 13 10 Note Losing power during the flashing process can cause corruption of vital settings such as coefficients serial number model number etc If losing settings contact AADI Service department for new setting file for the specific sensor with further instructions 7 2 4 Passkey for write protection To avoid accidental change most of the properties are write protected There are four levels of ...

Страница 51: ...or switch the power OFF and then back ON or else calculated parameters may be corrupt This forces the sensor to start up with the new configuration input If the Enable Sleep property is set to Yes and the Comm TimeOut property is not set to Always On the sensor enters sleep mode after reset At startup reset the sensor performs measurements according to the interval setting if the mode is Smart Sen...

Страница 52: ...ents the last set of calculated measurement data Get ConfigXML Outputs information about the configuration in XML format Get DataXML Outputs information about available enabled parameters in XML format Get Property Output Property value refer Table 1 2 Get All Output all property values Set Property Value Value Set Property to Value Value Set Passkey Value Set passkey to change access level Save S...

Страница 53: ...mmand name Get followed by a parameter returns the name and unit of the parameter the product and serial number of the sensor and finally the latest parameter reading refer example in Figure 7 5 A special version Get All reads out all available properties in the sensor Some properties are passkey protected and will not be shown without first writing the passkey Refer chapter 1 5for properties and ...

Страница 54: ...e Text controls the presentation of measured data When the property is set to Yes the output string includes the descriptive parameter name with engineering units of measure When the property is set to No the output parameters are presented without descriptive parameter names and engineering units the parameter order is the same refer Figure 7 4 for an example The property called Enable DecimalFor...

Страница 55: ...Stop is recommended to avoid output strings while configuring the sensor Example 1 Enable Rawdata Press Enter to start communicating with the sensor refer chapter 7 2 2 press Enter Stop Wait for ack Repeat if necessary Set Passkey 1 Set Enable Rawdata yes wait for ack Save wait for ack Reset the sensor will restart with new settings Example 2 Change Number of Samples to 2048 Press Enter to start c...

Страница 56: ...nsor will restart with new settings 7 4 Scripting sending a string of commands Often it may be usefully to include more than one command in a text file For example the instructions below can be written in an ordinary text editor and saved as a text file which can be sent to the sensor Example of text file Set sampling interval to 30 seconds Stop Stop current measurement Wait for ack Repeat if nece...

Страница 57: ...s not clogged Unscrew the pressure port cap inspect the holes of the cap and clean it if necessary Before replacing the pressure port cap inspect that there is silicon oil in the pressure port To avoid clogging the pressure port is filled with high viscous silicon oil After long time use this oil may vanish If no oil can be seen in the pressure port we recommend that the sensor is returned to the ...

Страница 58: ...Page 58 Aanderaa Data Instruments AS TD302 8 3 Example of Test Specification sheet and Calibration certificate Figure 8 1 Example of Test and Specification Sheet ...

Страница 59: ...January 2014 TD 302 Operating Manual for Pressure 4117 4117R Tide 5217 5217R Wave Tide 5218 5218RPage 59 Figure 8 2 Example of Calibration Certificate ...

Страница 60: ...ure port is made of Titanium The sensor foot holds the electrical connector and O rings for bulk head mounting The pressure port at the other end is equipped with a Swagelok 1 8 inch compression fitting allowing easy connection to calibration and test equipment In order to avoid clogging and internal corrosion the pressure inlet is filled with high viscous silicon oil to isolate the pressure eleme...

Страница 61: ...e bridge circuit will change By applying a constant voltage over the bridge a voltage that varies with the pressure is generated This voltage is sampled by a high resolution analogue to digital converter ADC controlled by a digital signal processor DSP A thermistor sensing the water temperature is also incorporated in the sensor and sampled by the ADC All pressure transducers have a temperature dr...

Страница 62: ...le 1 2 and Figure A3 Figure A 3 Sensor calibration coefficients properties are available as sensor output Each coefficient holds a set of 4 values e g PT coeffs 01 PT coeffs 02 PT coeffs 03 PT coeffs 04 The engineering data are calculated from the raw sensor readings and these calibration coefficients using the following equations Temperature Temperature TempCoeffs0 TempCoeffs1 TNorm TempCoeffs2 T...

Страница 63: ...2 C3 PNorm 3 C4 PNorm 4 where PRaw RawdataPressure PNorm 8388608 Raw P C0 PTCoeffs00 PTCoeffs01 TNorm PTCoeffs02 TNorm 2 PTCoeffs03 TNorm 3 C1 PTCoeffs10 PTCoeffs11 TNorm PTCoeffs12 TNorm 2 PTCoeffs13 TNorm 3 C2 PTCoeffs20 PTCoeffs21 TNorm PTCoeffs22 TNorm 2 PTCoeffs23 TNorm 3 C3 PTCoeffs30 PTCoeffs31 TNorm PTCoeffs32 TNorm 2 PTCoeffs33 TNorm 3 ...

Страница 64: ... the sensor uses the fixed atmospheric pressure set by the user in Sensor Configuration refer chapter 5 In RS232 RS422 the atmospheric Air Pressure is a property that must be set by the user refer e g chapter 6 Second the hydrostatic pressure is calculated by subtracting the atmospheric pressure from the time series samples The hydrostatic pressure is used to calculate the deployment depth Calcula...

Страница 65: ...eans that the dynamic pressure is significantly damped while less damped when the damping factor is larger as the damping factor approaches 1 the observed dynamic pressure approaches the true dynamic pressure To compensate for the damping of the dynamic pressure the power spectrum is multiplied with a transfer function that is the inverse of the function describing the damping of the dynamic press...

Страница 66: ... fi is a specific frequency and S fi is the wave spectrum component at that frequency Hence the moment of order zero mo is found by summing the wave spectrum components from zero frequency up to the cut off frequency Based on the above considerations and the definition of the spectral moments the moment of order zero is equal to 2 0 0 2 N i i a m Assuming that X is a simple sinusoidal wave with am...

Страница 67: ...y the pressure sensor6 d g f Off Cut 282 0 where g is the gravitational coefficient and d the deployment depth Calculation of Wave parameters The sea conditions can be described by a number of wave parameters like e g Significant Wave Height Maximum Wave Height Mean Zero Crossing Peak Wave Period Mean Wave period Energy Wave Period Irregularity Wave Steepness These parameters are provided by the W...

Страница 68: ...led Significant Wave Height The parameter provided by the WTS is 0 m H Maximum Wave Height The expected Maximum Wave Height is estimated based on the statistical distribution of the wave height parameter Assuming that the sea surface can be modelled as a narrow banded Gaussian Process the standard model is a wave amplitude distribution based on the Rayleigh s distribution This yields the following...

Страница 69: ... According to WMO the wave period 02 m T is sensitive to the cut off frequency in the calculations of the spectral moments Refer to NOTE on page 71 Figure A 5 Part of a wave record Zero down crossings are circled Peak Wave Period The Peak Wave Period TWp is equal to the inverse of the frequency of the peak of the wave spectrum Wp Wp f T 1 where fWp is the frequency of the peak of the wave spectrum...

Страница 70: ...ven as 10 2 0 49 0 m m T H J Refer NOTE on page 71 Regularity When studying the wave parameters provided e g by the WTS note that the motion of the sea surface caused by the waves is a random process Significant wave height is for example a measure of the average wave height The height of many if not most of the waves in a record will differ from the significant wave height The more irregular the ...

Страница 71: ...ean Wave Period and Energy Wave Period If the pressure variations caused by the waves are smaller than what can be measured by the pressure sensor the estimated wave periods will approach 1 fCut Off This will happen e g if the instrument is deployed too deep to monitor the current sea state Spectrum and pressure series The spectrum is presented as the value of each frequency component in the wave ...

Страница 72: ...the recording Interval setting there can be overlap between the pressure series The parameter makes it easy to remove duplicated data overlap and generate continuous pressure samplings at 2 or 4 Hz Continuous pressure samplings can be used for e g tsunami warning systems If samplings are not performed during the entire recording interval the Last Pressure Sample Index will be reset for each record...

Страница 73: ... Cable 3855 RS 232 X Figure A 7 Set up and configuration Cable 4865 RS 232 X Figure A 8 Set up and configuration Cable 4799 RS 422 X Figure A 9 Free end Cable 4762 Rs 232 X X Figure A 10 Free end Cable 4763 Rs 422 X Figure A 11 Free end Cable 3880 X X Figure A 12 Remote Sensor Cable 4793 AiCaP X Figure A 13 Patch Cable 4999 AiCaP X Table A 2 Access protection levels Figure A 6 Set up and configura...

Страница 74: ...Page 74 Aanderaa Data Instruments AS TD302 Figure A 7 Set up and configuration cable 4865 RS 232 for field use Figure A 8 Set up and configuration cable 4799 RS 422 for field use ...

Страница 75: ...January 2014 TD 302 Operating Manual for Pressure 4117 4117R Tide 5217 5217R Wave Tide 5218 5218RPage 75 Figure A 9 Drawing Free end Cable 4762 RS 232 Figure A 10 Drawing Free end Cable 4763 RS 422 ...

Страница 76: ...Page 76 Aanderaa Data Instruments AS TD302 Figure A 11 Drawing Free end Cable 3880 Figure A 12 Drawing Remote Sensor Cable 4793 AiCaP ...

Страница 77: ...January 2014 TD 302 Operating Manual for Pressure 4117 4117R Tide 5217 5217R Wave Tide 5218 5218RPage 77 Figure A 13 Drawing Patch Cable 4999 AiCaP ...

Страница 78: ...t Sensor 100 4880 R Temperature Sensor 200 4930 ZPulse Doppler Current Sensor 100 General Change Description Most of AADI s Smart Sensors utilized common communication protocols for use at the RS232 and RS422 interface Two protocols are available Smart Sensor Terminal protocol and the AADI Real Time protocol where the Smart Sensor Terminal protocol is a simple ASCII command string based protocol a...

Страница 79: ...nging the operation mode for example Set Mode Smart Sensor Terminal Specific properties control the formatting of the output string for example Set Enable Text no 7 The startup notification at power up is changed from Mode Mode name to the following format StartupInfo Product No Serial no Mode Protocol Name Version Version No Config Version Version No for example StartupInfo 4330 83 Mode AADI Smar...

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