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Geokon 8020-59, Инструкция по эксплуатации

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41 

 

APPENDIX D. DATA REDUCTION 

 

D.1 Pressure Calculation 

 
The digits that are calculated from the voltage and current outputs are based on the equation: 

 

Digits =

�

1

Period

�

2

x 10

-3

  

 

Or 

 

Digits

=

Hz

2

1000

 

 

Equation 9 - Digits Calculation 

 

For example, a piezometer reading 8000 digits corresponds to a period of 354 

µ

s and a frequency 

of 2828 Hz. Note that in the above equation, the period is in seconds. 
 
Digits are directly proportional to the applied pressure. 
 

Pressure 

=

  

 

(Current Reading - Initial Zero Reading) 

×

 Linear Calibration Factor 

 

Or 

 

P = (R

1

 – R

0

) 

×

G 

 

Equation 10 - Convert Digits to Pressure 

 

Since the linearity of most sensors is within 0.2% FS the errors associated with non-linearity are 
of minor consequence. However, for those situations requiring the highest accuracy it may be 
desirable to use a second order polynomial to get a better fit of the data points. The use of a 
second order polynomial is explained in Appendix F. 

 

The calibration report included with each transducer shows the data from which the linear gage 
factor and the second order polynomial coefficients are derived. Columns on the right show the 
size of the error incurred by assuming a linear coefficient and the improvement that can be 
expected by going to a second order polynomial. In many cases, the difference is minor. The 
calibration reports give the pressure in certain engineering units. These can be converted to other 
engineering units using the multiplication factors shown in Table 3 below. 
 

 

Содержание 8020-59

Страница 1: ...tained herein is believed to be accurate and reliable However Geokon Inc assumes no responsibility for errors omissions or misinterpretation The information herein is subject to change without notification Copyright 2006 2018 by Geokon Inc Doc Rev J 05 18 2018 Instruction Manual Model 8020 59 Vibrating Wire to Analog Converter ...

Страница 2: ......

Страница 3: ...re are no warranties except as stated herein There are no other warranties expressed or implied including but not limited to the implied warranties of merchantability and of fitness for a particular purpose Geokon Inc is not responsible for any damages or losses caused to other equipment whether direct indirect incidental special or consequential which the purchaser may experience as a result of t...

Страница 4: ...IPLEXER TIMING SPECIFICATIONS 27 APPENDIX B THERMISTOR TEMPERATURE DERIVATION 28 APPENDIX C WIRING CONFIGURATIONS 29 C 1 VOLTAGE OUTPUT SINGLE CHANNEL MODE DIGITAL I O DAS 29 C 2 VOLTAGE OUTPUT 16 CHANNEL MODE DIGITAL I O DAS 30 C 3 VOLTAGE OUTPUT 32 CHANNEL MODE DIGITAL I O DAS 31 C 4 CURRENT OUTPUT SINGLE CHANNEL MODE DIGITAL I O DAS 32 C 5 CURRENT OUTPUT 16 CHANNEL MODE DIGITAL I O DAS 33 C 6 C...

Страница 5: ...FIGURE 24 CONNECTION EXAMPLE FOR ONE CHANNEL 8020 59 WITH VOLTAGE OUTPUT TO DIGITAL I O DAS 29 FIGURE 25 CONNECTION EXAMPLE FOR 16 CHANNEL MULTIPLEXER 8020 59 WITH VOLTAGE OUTPUT AND DIGITAL I O DAS 30 FIGURE 26 CONNECTION EXAMPLE FOR 32 CHANNEL MULTIPLEXER 8020 59 WITH VOLTAGE OUTPUT AND DIGITAL I O DAS 31 FIGURE 27 CONNECTION EXAMPLE FOR ONE CHANNEL 8020 59 WITH CURRENT OUTPUT TO DIGITAL I O DAS...

Страница 6: ... EQUATION 4 ANALOG VOLTAGE OUTPUT 14 EQUATION 5 ANALOG CURRENT OUTPUT 14 EQUATION 6 TEMPERATURE DERIVED FROM VOLTAGE OUTPUT 16 EQUATION 7 TEMPERATURE DERIVED FROM CURRENT OUTPUT 16 EQUATION 8 RESISTANCE TO TEMPERATURE 28 EQUATION 9 DIGITS CALCULATION 41 EQUATION 10 CONVERT DIGITS TO PRESSURE 41 EQUATION 11 TEMPERATURE CORRECTION 42 EQUATION 12 BAROMETRIC CORRECTION 43 EQUATION 13 CORRECTED PRESSUR...

Страница 7: ...output throughout the operating temperature range 20 ºC min 80 ºC max In a similar fashion the temperature reading from the transducer s thermistor is available with 10 bit resolution one part in 1024 When configured for single channel operation the 8020 59 updates the reading approximately once every second Pin Number Signal Name Signal Description 1 GND Analog Signal Ground 2 V OUT Conversion Vo...

Страница 8: ...0 59_setup zip and select Extract All from the resulting popup menu see Figure 1 Figure 1 Extracting the 8020 59 Installer 2 Another dialog will be displayed showing the editable default destination folder for the extracted contents see Figure 2 When satisfied with the destination folder click on the Extract button to extract the contents of the zipped installer see Figure 2 Figure 2 Select Destin...

Страница 9: ...Installer 4 After a few moments the dialog shown in Figure 4 will be displayed Figure 4 Install Wizard Start Screen 5 After clicking on the Next button the dialog shown in Figure 5 is displayed Figure 5 Install Wizard Choose Users ...

Страница 10: ...is will bring up the dialog shown in Figure 6 Figure 6 Install Wizard Choose Start Menu Folder 7 The dialog shown in Figure 6 allows the installer to choose where the shortcut to launch the application will be located the default is the Geokon folder A shortcut will also be located on the desktop Clicking on Install begins the process of copying files and causes the dialog box shown in Figure 7 to...

Страница 11: ...ose the install wizard Figure 8 Install Wizard Launch 8020 59 Application 2 1 Configuring the COM Port After launching the 8020 59 Software Application the first thing that must be done is to configure the COM Port Click on the Com Setup or press the Alt and the c key at the same time to select a COM port for communication with the 8020 59 VW to Analog Converter See Figure 9 Figure 9 8020 59 Softw...

Страница 12: ...n such as COM1 or an external one via a USB to Serial Converter see Figure 10 Some newer PCs are so fast that a small delay between characters is needed to give the 8020 59 time to process the characters The Inter character Delay is specified in milliseconds Figure 10 Communications Parameters Dialog ...

Страница 13: ...al USB to Serial converter drivers for this device will need to be installed before this step see Section 2 1 3 Connect 12VDC to connector pin six OR 24VDC to connector pin three see Table 1 in Section 1 4 Connect the power supply return or Ground to connector pin seven OR if using a 24V supply connector pin four 24V GND see Table 1 5 Connect the un pressurized VW transducer to the 8020 59 see Tab...

Страница 14: ...heckbox is checked 10 Click Activate Monitor or press the Alt and m keys The Upload Confirmation dialog will be displayed with the prompt Do you want to upload the current settings to the 8020 59 Click the Yes button The Single Channel Monitor screen should now appear see Figure 12 and after several seconds should update with a reading Figure 12 Single Channel Monitor ...

Страница 15: ...for further information on Data Reduction 12 Click Exit or press the Alt and e keys to return to the Setup Screen After setup is complete the PC is disconnected from the 8020 59 and the sensor is in a pressurized state the Current Reading R1 Digits will need to be calculated from the value read from the analog voltage V OUT in volts or current I OUT in milliamperes output See Section 4 3 for more ...

Страница 16: ... less than 10μA 12V or 16 5mA 24V The 8020 59 setup and configuration utility runs on a PC operating under the Windows operating system and communicates to the 8020 59 via the 8020 59 s RS 232 port A Command Line interface is provided in the 8020 59 internal firmware with a command set that allows all functions to be easily set up and calibrated 4 1 Theory of Operation The 8020 59 provides excitat...

Страница 17: ...de a continuous 0 5V and 4 20mA output to the host DAS updated approximately every second By controlling the ENABLE input to the 8020 59 the 8020 59 voltage and current outputs VOUT and IOUT will either be proportional to the transducer s digits ENABLE 0V or disconnected or the transducer s temperature in degrees Centigrade ENABLE 5V By controlling the CLOCK input to the 8020 59 the 8020 59 will e...

Страница 18: ... host DAS that the voltage and current outputs proportional to the digits are at VOUT and IOUT and are ready to be acquired Once the reading is acquired the host system brings CLOCK low 0V and then high 5V again to read the temperature of the transducer When this reading is ready 100ms later the VALID output will again go high 5V indicating that the voltage and current outputs now proportional to ...

Страница 19: ...g the VALID output high 5V indicating to the host DAS that the voltage and current outputs proportional to the digits of transducer number one are at VOUT and IOUT and are ready to be acquired Once the reading is acquired the host system brings CLOCK low 0V and then high 5V again to increment the 8020 59 and multiplexer to the next transducer When this reading is ready approximately one to two sec...

Страница 20: ...urrent 4 20mA Output assumes Iout is in milliamperes mA Digits Vout Digits Span 5V Minimum Limit Equation 2 Analog Voltage Output Digits Iout 4mA Digits Span 16mA Minimum Limit Equation 3 Analog Current Output For the following negative slope transducers 4500 4600 4675 4800 and 4900 use Equation 4 for Analog Voltage Output assumes Vout is in Volts V or Equation 5 for Analog Current 4 20mA Output a...

Страница 21: ...ond of two CLOCKS in 16 Channel Mode The 8020 59 offers a temperature voltage output with 10 bit resolution one part in 1024 over a 100º C span 20º C to 80º C See Section 4 6 for specific calculations 4 5 Connection to a Current Input DAS The 8020 59 sources a current I OUT 4 20mA that is proportional to the digits of the transducer being read ENABLE 0V or disconnected in Single Channel Mode after...

Страница 22: ...el mode See Figure 14 for 16 Channel mode control signal timing Temperature is derived from the voltage output by Equation 6 Note Assumes Vout is in volts V Minimum Temperature 20 C Degree Span 100 C Minimum Temperature Vout Degree Span 5V 20 20 Vout Equation 6 Temperature Derived from Voltage Output Temperature is derived from the current output by Equation 7 Note Assumes Iout is in milliamperes ...

Страница 23: ...nected to a computer using a terminal emulator program such as HyperTerminal typing Enter returns the title screen Geokon Inc 8020 59 VW to Analog Interface Rev 4 0 2 12 05 2011 Type for Help Typing Return returns the Help Screen COMMAND DESCRIPTION C1 Single VW and Thermistor C2 16 VW s and 16 Thermistors C3 32 VW s D Display Channel Parameters D0 Display ALL Channel Parameters C2 C3 only E Enabl...

Страница 24: ...er type U and the channel comma maximum digits comma slope comma gage type Enter Example U1 10590 1 Enter To set the minimum digits type L and the channel comma minimum digits Enter Example L1 9990 Enter Command RD disabled the VALID line from activating when a non successful vibrating wire sensor conversion takes place A high level on the VALID line would then indicate that a successful conversio...

Страница 25: ... low power sleep mode off drawing less than 10μA from the 12V power source less than 16 5mA from the 24V power source Finally pressing the Esc key in C1 single channel mode only will start the readings screen with the 8020 59 outputting 0 5V and 4 20mA 1 11665 75 22 8 1 1 11665 95 22 7 1 1 11666 50 22 8 1 1 11666 60 22 8 1 1 11667 05 22 8 1 1 11666 55 22 9 1 1 11666 10 22 8 1 1 11665 65 22 8 1 1 1...

Страница 26: ...9 Application To start the 8020 59 application select Start Programs 8020_59 8020_59 This brings up the Startup dialog see Figure 9 From the Startup dialog the major functions Mode Communications and Calibration of the 8020 59 can be accessed Click Com Setup to select the Com Port that the 8020 59 is connected to see Section 2 1 and Figure 10 After the communication port that the 8020 59 is attach...

Страница 27: ...e Limits section of the setup dialog As of firmware revision 4 0 0 the default minimum and maximum values are 0 and 25 000 respectively With its 20 bit Digital to Analog Converter the 8020 59 has more than enough resolution to allow the entire voltage or current range to be divided by 25 000 This can make setup easier than previous firmware revisions When complete click Update Info to store this i...

Страница 28: ...p dialog displays the 16 Channel Configuration window Figure 17 16 Channel Configuration Screen From this window all of the transducer information for each of the 16 Channels may be entered The transducer type slope and limits are stored in non volatile EEPROM internal to the 8020 59 All other information is stored to a configuration file on the host computer s hard drive and loaded automatically ...

Страница 29: ...on report at Maximum digits and Minimum digits Alternately clicking on the Use Defaults checkbox will set the minimum and maximum limits to 0 and 25 000 respectively When complete click Update Info to store this information to the 8020 59 To update all of the channels with the current configuration click Update All Info To retrieve the info from the 8020 59 s EEPROM for the current configuration c...

Страница 30: ...expand Double clicking where indicated activates the reading screen Figure 19 for that channel Figure 19 Channel One Monitor This screen displays the transducer information along with the reading in digits or microstrain μE the calculated reading voltage the calculated reading current the temperature of the transducer and the calculated voltage and current that is representative of the temperature...

Страница 31: ...nel Configuration and Monitor modes work identically to their 16 Channel counterparts with the only difference being that there are no temperature measurements see Figure 20 Figure 20 32 Channel Monitor Screen Figure 21 Channel Three Monitor ...

Страница 32: ...400 Hz Frequency end 3500 Hz Sweep Duration 50 mSec Sweep Shape Linear Gage Type 2 Frequency start 2800 Hz Frequency end 4500 Hz Sweep Duration 60 mSec Sweep Shape Linear Gage Type 3 Frequency start 400 Hz Frequency end 1200 Hz Sweep Duration 300 mSec Sweep Shape Linear Gage Type 4 Frequency start 1200 Hz Frequency end 2800 Hz Sweep Duration 120 mSec Sweep Shape Linear Gage Type 5 Frequency start ...

Страница 33: ...n Voltage 2 5 VDC A 2 Multiplexer Timing Specifications Enable Clock Channel 1 T1 T2 T3 No Channel Selected No Channel Selected Channel 16 Pulse 1 Pulse 2 Pulse 31 Timing T2 T4 indefinate T3 250 µsec min T1 T5 250 µsec min Selected Selected Pulse 32 T4 T5 Figure 22 16 Channel Multiplexer Timing Requirements Enable Clock Channel 1 Channel 2 T1 T2 T3 No Channel Selected No Channel Selected Channel 3...

Страница 34: ...2 83 107 9 123 77 66K 36 8006 4 1363 44 331 5 84 105 2 124 72 81K 35 7618 5 1310 45 321 2 85 102 5 125 68 30K 34 7252 6 1260 46 311 3 86 99 9 126 64 09K 33 6905 7 1212 47 301 7 87 97 3 127 60 17K 32 6576 8 1167 48 292 4 88 94 9 128 56 51K 31 6265 9 1123 49 283 5 89 92 5 129 53 10K 30 5971 10 1081 50 274 9 90 90 2 130 49 91K 29 5692 11 1040 51 266 6 91 87 9 131 46 94K 28 5427 12 1002 52 258 6 92 85...

Страница 35: ...29 APPENDIX C WIRING CONFIGURATIONS C 1 Voltage Output Single Channel Mode Digital I O DAS Figure 24 Connection Example for One Channel 8020 59 with Voltage Output to Digital I O DAS ...

Страница 36: ...30 C 2 Voltage Output 16 Channel Mode Digital I O DAS Figure 25 Connection Example for 16 Channel Multiplexer 8020 59 with Voltage Output and Digital I O DAS ...

Страница 37: ...31 C 3 Voltage Output 32 Channel Mode Digital I O DAS Figure 26 Connection Example for 32 Channel Multiplexer 8020 59 with Voltage Output and Digital I O DAS ...

Страница 38: ...32 C 4 Current Output Single Channel Mode Digital I O DAS Figure 27 Connection Example for One Channel 8020 59 with Current Output to Digital I O DAS ...

Страница 39: ...33 C 5 Current Output 16 Channel Mode Digital I O DAS Figure 28 Connection Example for 16 Channel Multiplexer 8020 59 with Current Output and Digital I O DAS ...

Страница 40: ...34 C 6 Current Output 32 Channel Mode Digital DAS Figure 29 Connection Example for 32 Channel Multiplexer 8020 59 with Current Output and Digital I O DAS ...

Страница 41: ...35 C 7 Voltage Output Single Channel Mode PLC DAS Figure 30 Connection Example for One Channel 8020 59 with Voltage Output 8020 59 PLC and PLC DAS ...

Страница 42: ...36 C 8 Voltage Output 16 Channel Mode PLC DAS Figure 31 Connection Example for 16 Channel Multiplexer 8020 59 w Voltage Output 8020 59 PLC and PLC DAS ...

Страница 43: ...37 C 9 Voltage Output 32 Channel Mode PLC DAS Figure 32 Connection Example for 32 Channel Multiplexer 8020 59 w Voltage Output 8020 59 PLC and PLC DAS ...

Страница 44: ...38 C 10 Current Output Single Channel Mode PLC DAS Figure 33 Connection Example for One Channel 8020 59 with Current Output 8020 59 PLC and PLC DAS ...

Страница 45: ...39 C 11 Current Output 16 Channel Mode PLC DAS Figure 34 Connection Example for 16 Channel Multiplexer 8020 59 w Current Output 8020 59 PLC and PLC DAS ...

Страница 46: ...40 C 12 Current Output 32 Channel Mode PLC DAS Figure 35 Connection Example for 32 Channel Multiplexer 8020 59 w Current Output 8020 59 PLC and PLC DAS ...

Страница 47: ...e errors associated with non linearity are of minor consequence However for those situations requiring the highest accuracy it may be desirable to use a second order polynomial to get a better fit of the data points The use of a second order polynomial is explained in Appendix F The calibration report included with each transducer shows the data from which the linear gage factor and the second ord...

Страница 48: ... factors for mercury and water in Table 3 are approximations D 2 Temperature Correction Careful selection of materials is made in constructing the vibrating wire piezometer to minimize thermal effects however most units still have a slight temperature coefficient Consult the supplied calibration report to obtain the coefficient for a given piezometer Since piezometers are normally installed in a t...

Страница 49: ...usually recorded in inches of mercury a Conversion Factor is necessary to convert to PSI The Conversion Factor for inches of mercury to PSI is 491 Table 3 lists other common Conversion Factors The calculated correction is usually subtracted from the Pressure calculated using Equation 10 If the engineering units were converted remember to apply the same conversion to the calculated barometric corre...

Страница 50: ...44 APPENDIX E SAMPLE CALIBRATION REPORT Figure 36 Vibrating Wire Pressure Transducer Calibration Report ...

Страница 51: ...e Linearity FS column is Calculated Pressure True Pressure Full Scale Pressure x 100 G R1 R0 P F S x 100 Equation 15 Linearity Calculation For example when P 40 psi G R0 R1 gives a calculated pressure of 39 642 psi The error is 0 357 psi or as much as 9 9 inches of water Whereas the polynomial expression gives a calculated pressure of A 7773 2 B 7773 C 39 996 psi and the actual error is only 0 004...

Страница 52: ...eading 0 psi is 9139 digits 8020 59 maximum digits and the average maximum reading 100 psi is 5691 digits 8020 59 minimum digits These readings were recorded at an atmospheric pressure of 1001 4 mbar corresponding to the conditions and altitude at the Geokon factory To compensate for elevation change take a new zero reading at the site location This new zero reading becomes the maximum digits ente...

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