Temperature Analysis System «Digital Flow
Contents
1. be further changed All register receiver devices are identical They can be setup to received signal from any Configuration Sensor ID 0001 sensor with a known ID code that is located in the operational range Pressing Button 2 selects the value s order one of four digits that can be then modified The selected digit appears underlined on the screen Pressing Button 3 sets the value of this digit which ranges from 0 9 The general procedure for detecting ascending air flow Air mass with a higher temperature relative to the surrounding air has a lower spec gravity or density and therefore ascends This lies in the principle of the formation of ascending air flows The Sun warms up a certain region of the Earth s surface in the process forming a warm air mass When this air mass reaches a certain temperature affected by the wind it rises from the Earth s surface ascending in the wind s directional flow The sportsman then has to locate the formation and take off of the ascending air flow using the graph or has to locate the already formed air flow in the area where the sensor was installed In order to correctly detect the ascending air flow the sensor s mast has to be as tall as possible Near the ground air has a higher turbulence which decreases the accuracy of detecting warm and cold air masses In addition to this the closer the sensor is to the ground the more distant it is from the center of ascending air flow the final2. Temperature Analysis System Digital Flow 2 User Manual General usage and key construction principles The temperature analysis system Digital Flow 2 is designed to measure and monitor air temperature fluctuations Digital Flow 2 system was specifically designed to locate ascending air flows in aeromodelling sports The temperature analysis system Digital Flow 2 consists of a fast acting and high sensitivity temperature sensor and portable receiver device The sensor should be positioned on a mast in a remote location away from the place where an airplane model is being launched and the receiver device can be placed in any location convenient for the user Measured data is transferred from the sensor to receiver using a digital radiochannel of a fixed frequency Each sensor is assigned a unique code for its radiochannel which allows several sensors to work simultaneously The data transfer process implements a noise cancelling algorithm for error detection and correction The three button interface on the receiving device allows users to change the settings and work mode of the device Transferred data is first processed by the microprocessor in the receiver and then results are displayed on its graphical LCD display as a numbers and temperature graph Ascending air flows can be then determined by the visual analysis of temperature fluctuations on this graph Sensor technical specifications Temperature sensor s
3. alled in accordance to their polarity and then the device frame has to be assembled back Both the sensor and receiver can be turned on off in any order When the sensor is turned on the electric engine for blowing air should start working To extend the battery life sensor s microprocessor initiates data transfer only when an alteration in temperature was detected After receiver register is turned on it starts displaying air temperature measured by the sensor and building the temperature graph Signal quality can be monitored and controlled using the Y icon on the display When it doesn t change or blink it indicates that data is being continuously transferred If the sensor code doesn t match the code of the receiver or if the receiver is close to a sensor with a different ID the YID icon is displayed The YE icon is displayed in case of fatal errors that could not be corrected YC icon is displayed if errors were successfully corrected The receiver can be placed on ones wrist using the wristlet on this device Digital Flow 2 allows monitoring battery charges If the sensor s or receiver s battery is discharged there will be an icon in the form of battery displayed on the screen It may have a R and or S index for receiver or sensor respectively In order to locate ascending air flow using Digital Flow 2 it is necessary to have a mast tower with the length of at least 5 m 5 46 yd Sensor has to be mounte
4. con description Power source Tower LE Battery low Receiver On Off To ee low Sensor Elfa 4x Ye 480 Graph smoothing Button 1 2x 4x 2x or 4x graph smoothing is turned on Signal transmission Button 2 Y No errors in transferred data YE Fatal errors could not recover Button 3 Ym Sensor with a different ID is in close distance Yc Errors were corrected Interface functionality and data display Button 1 Allows users to sequentially view and select programmable settings and then return to the graph display mode Button 2 Allows changing settings In the graph display mode it allows changing the degree of graph smoothing 2x or 4x Button 3 Allows changing settings In the graph display mode this button sequentially turns on off display of the following values period of time for a complete graph refresh scale for values on Y axis Numerical values that are displayed on the screen Tsens Current air temperature in C Tavg average temperature which is calculated as an arithmetic average of all values over the period of time for a complete graph refresh AT the difference between Tsens and Tavg Setting up the device To install batteries in the sensor or receiver it is necessary to unscrew the fixing bolts located on end faces of their frames and separate each frame into two halves AAA size batteries or rechargeable batteries should be used in these devices Batteries have to be inst
5. d on the top of this mast A plastic fishing line of a matching size can be used as a mast However installing sensor on a fishing line made of carbon fiber or metal is not recommended because these types of materials can screen the signal As a result the signal transfer distance and operational length can decrease As an option the top part of the carbon fiber fishing line can be replaced with a wooden or fiber glass rod Sensor has to be mounted to this rod using rubber hoops attached to the back of the device The inlet of temperature sensor has to be pointing downwards Receiver settings Settings can be changed after pressing Button 1 They are then listed sequentially by pressing this button Warning power can be turned off only when device is in graph display mode Power button is blocked when viewing or changing settings and it is necessary to return to the graph display mode to turn off the device Programmable parameters 1 Y Axis Range Selection of the temperature scale for Y axis The scale should be selected based on weather conditions If temperature fluctuations are significant and temperature graph is not fully displayed on the screen then the scale value needs to be modified and increased In the opposite case if the amplitude of temperature fluctuations is insignificant then a more sensitive scale needs to be selected The following scale values are supported 0 16 0 32 0 64 1 28 2 56 5 12 and 10 24 C w
6. e Digital Flow 2 allows you to design better methods for locating ascending thermal airflows In any case locating ascending air flows has never been so easy simple and convenient as with the Digital Flow 2 system We wish you good luck and the best results Possible malfunctions of Digital Flow 2 system and resolution methods Malfunction Error The cause Resolution A graph on receiver device is not within the range of the Y Axis scale The battery discharge indicator with the S index is showing Strong battery discharge Batteries were not replaced on a timely basis Replace batteries inside the sensor It is suggested to change batteries right after the discharge indicator was illuminated The contrast of LCD display on receiver device is low The battery discharge indicator with the R index is showing Strong battery discharge inside receiver Batteries were not replaced on a timely basis Replace batteries inside the receiver device It is suggested to change batteries right after the discharge indicator was illuminated The working range of the system at one place is smaller than in the other Temperature graphs are displayed with high discrepancy One of the following indicators are illuminated YE YC or YID 1 Strong radio emission on the system s frequency or close to it In the past it was determined that the working range could decrease when
7. ensitivity 0 01 C Temperature range 0 61 44 C The response time on temperature fluctuations to5 0 6 Sec too 7 Sec 3 Number of reads per second 4 Output power of transmission device 6 0 mW Transmission frequency 433 92 MHz Voltage 1 6 3 3 V 2x AAA Uptime 2 3 days Current 18 40 mA Size 57 x 49 x 24 mm 2 24 x 1 92 x 0 94 Receiver technical specifications LCD graphical display dimension 133 x 64 Pixels monochrome Temperature unit values on Y axis 0 16 0 32 t 0 64 1 28 2 56 5 12 10 24 C Displacement velocity of graph on X axis 0 2 4 Pixels Sec step 0 1 Period of time for complete refresh of graph 19 2 384 Sec Maximum operational length 300 met 328 yd Voltage 0 9 1 5 V 1x AAA Uptime 3 4 days Current 20 35 mA Size 88 x 57 x 17 mm 3 46 x 2 24 x 0 67 1 Implemented in versions of Digital Flow 2 2 16 ECC and higher Warning Receivers and sensors of version 2 15 and lower are not compatible with receivers and sensors of version 2 16 ECC and higher Period of time it takes sensor to change its readings by 50 from the difference in current and applied temperature 3 Period of time it takes sensor to change its readings by 90 from the difference in current and applied temperature When using the values of 0 16 and 0 32 if T changes by 0 01 C graph size changes by 4 and 2 pixels respectively The interface of receiver device I
8. formation of which happens at a height of several dozen meters from the ground Therefore the sensor s mast height has to be 8 10 meters or higher from the ground When setting up the sensor s mast it is necessary to account for the wind s speed and desired time period from locating the ascending air flow to launching the model If the wind is weak the mast has to be positioned about 5 10 meters from the model s launching position and against the wind If the wind is strong the mast has to be positioned in a more distant location Generally the mast has to be positioned by practical considerations The distance from the model s launching position to the mast has to be big enough to provide time for launching the model The model has to gain altitude before the ascending airflow would reach the zone of model s start The relation between temperature graphs and weather conditions 1 Even weather this and the next graph were obtained with Y Axis Range 0 64 C 2 Air warms up and forms an ascending thermal air flow 3 The air mass took off or was blown away by the wind This type of graph gives the most indicative signal for launching an airplane model 4 Descending air flow The figures above show general temperature graphs obtained using the Digital Flow 2 system These type of graphs were recognized by many well known people in aeromodelling sports as the most common indicators for the discussed weather conditions Th
9. here each value is the maximum height of the graph on Y axis Therefore if scale value is set to 0 64 C the Y axis is going to be 0 32 C in its positive direction and 0 32 C in its negative direction from 0 C scale mark Pressing Button 2 selects the previous value and pressing Button 3 selects the next value for the scale range Pressing Button 1 saves the selected value into battery independent memory and switches to the next configuration parameter When device is in graph display mode the value of Y Axis Range is displayed in the top right corner and it can be turned on or off using Button 3 Configuration Y Axis Range 0 64 C 2 Update Speed The refresh rate or the speed at which the graph is being shifted on X axis Update Speed is a period of Configuration time at which the graph is shifted on one Pixel to the right and a new Update Speed 0 5 sec value is calculated Values can range from 0 2 to 4 0 Sec with an increment of 0 1 Sec Pressing Button 2 allows selection of a higher value and pressing Button 3 allows selection of a lower value The value for Update Speed parameter has to be determined based on wind s speed and distance from sensor s mast to the location of the airplane model start or based on personal preference In the case of strong winds it is recommended to set a high value for the Update Speed parameter If the Update Speed is slow it might be necessary to activate graph smoot
10. hing Smoothing is performed based on two 2x or four 4x consequential readings of temperature by calculating their arithmetic average Note that after smoothing option is enabled it would apply to all points on the graph only after its complete refresh X Axis Range The period of time it takes to completely refresh the graph This value is auto computed by microprocessor based on the Update Speed parameter The average temperature Tavg is calculated over X Axis Range time period and the microprocessor recalculates Tavg every time there is an incoming value from the temperature sensor Tavg is then set as a zero point on Y axis As a result when temperature increases the graph line goes up but the whole graph is shifted downwards This is rather convenient because there is no need to manually adjust the zero point on the graph with temperature fluctuations When device is in graph display mode the value of X Axis Range is displayed in the top right corner and it can be turned on off using Button 3 X Axis Range 48 0 sec 3 Contrast The contrast of LCD display Pressing Button 2 increases the contrast and pressing Button 3 decreases it 4 Sensor ID Individual code of a transmitting sensor which can range from 0001 9999 This property allows the selection of a sensor which then will be used for measuring temperatures Each sensor has its unique ID code which is assigned during manufacturing and can t
11. using the system close to CDMA 2000 stations that use the frequency of 450 MHz 2 Several sensors are located in the range of you receiver device Other sensors are closer than your sensor and suppress the signal 1 Change the distance from sensor to receiver device Change the position of the system 2 Position your sensor and receiver device far from other sensors Control the quality of transmitted signal using the signal indicator on the device When there are no letters showing it indicates the strongest signal The receiver device is showing Error 1 The measured temperature is out of range from 0 61 44 C 2 The sensor was damaged by a foreign object which penetrated the box through the temperature inlet opening 1 To prevent system damage it must be used in its work temperature range 2 Sensor needs to be replaced The image on the LCD display doesn t change device doesn t respond to pressing buttons When pressing the power button receiver device doesn t respond Error in the program of receiver device Take batteries out of receiver device for several seconds and then insert them back
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