Manual - Communication Technology
Contents
1. The SBE 35 is an accurate ocean range temperature sensor that can be standardized against water triple point and gallium melt cells as if it were an SPRT but is also capable of measuring temperature in the ocean When used with a SBE 91 plus SBE 19 or SBE 25 CTD and Carousel water sampler the SBE 35 makes a temperature measurement each time a bottle fire confirmation is received and stores the value in EEPROM Each stored value contains the time of day and the bottle position in addition to the temperature data to facilitate comparison of the SBE 35 record with CTD and water bottle data The SBE 35 can use the built in CTD modem channel for two way communications It is not necessary to change cable connections to communicate and retrieve data from the SBE 35 Supplied with the SBE 35 is a powerful software package SEASOFT which enables the user to communicate retrieve data and to calculate and display temperature SEASOFT as supplied is designed to run on IBM XT AT 386 486 Pentium or compatible computers A separate software manual contains additional information on the setup and use of SEASOFT 2 Communication with the SBE 35 Communication with the SBE 35 Use the program TERM35 supplied with the SBE 35 or any other terminal program set to 300 baud 8 data bit no parity to communicate with the SBE 35 For lab use 1 Connect the SBE 35 to a SBE 90248 opto box using cable P N 80555 The opto box isolates power t2. 000 000 000 000 SBE 35 temperature 29 784 GAMP2A16 CNV SBE 35 S N 1 gallium melt FIGURE 3 References References Steinhart J S and Hart S R 1968 Calibration Curves for Thermistors Deep Sea Research 15 p 497 Bennett A S 1972 The Calibration of Thermistors over the Temperature range 0 30 C Deep Sea Research 19 p 157 II
3. Use with SBE 911plus and Carousel Water Sampler Use with SBE 19 or 25 CTD and Carousel Water Sampler eese Operation with Fixed Point Cells Section 5 Measurement Cycle Figure Descriptions Figures 1 3 References Warranty Policy Service Information Calibration Certificates 1 Introduction Section 1 Introduction About this manual How to contact Sea Bird This section includes contact information and manual version number This manual is to be used with the SBE 35 Deep Ocean Standards Thermometer Itis organized to guide a user from installation through operation and data collection We ve included command descriptions measurement cycle and calibration information If you have any questions do not hesitate to contact us at the numbers below Manual Version 005 03 30 99 Sea Bird Electronics Inc 1808 136 Place Northeast Bellevue Washington 98005 USA Telephone 425 643 9866 Fax 425 643 9954 E mail seabird 9 seabird com Website http www seabird com Our business hours are Monday Friday 0800 to 1800 Pacific Standard Time 1600 to 0200 Universal Time Except from April to October when we will be on summer time 1500 to 0100 Universal Time Section 2 2 Communication with the SBE 35 Communication with the SBE 35 System Description This section describes the function and set up of the SBE 35
4. a time constant of 0 5 seconds so it will lag the SBE 3 if temperature is changing during the measurement internal A first order correction is Determine the temporal gradient during the measurement interval from the secondary SBE 3 temperature data in the ROS file g temperature gradient C s Gradient corrected SBE 35 temperature SBE 35 measured temperature 0 5 g Use with a SBE 911plus and Carousel Water Sampler 1 Connect the SBE 11plus deck unit modem channel to a PC using a straight through serial cable P N 80073 2 Connect the SBE 35 to the SBE 9plus and Carousel water sampler using cable Y cable SBE 171220 DWG 32208 The three arms of the Y cable are labeled SBE 9 SBE 32 and SBE 35 Connect each arm to the proper device For the calibration comparison application mount the SBE 35 without tip bushing the desired secondary SBE 3 and 1200 rpm secondary pump into the 3 35 calibration frame that is supplied 10 4 Operating the SBE 35 Use with SBE 91 Iplus continued 3 4 Power the SBE 9plus with the 11plus deck unit Run TERM 35 and send the display status command DS to verify communication with the SBE 35 If no reply is received press F2 to bring up the setup form select communication set up and check the COMM port setting In addition check that the bottle confirm interface is correct for the application If not type interface and either 91 Iplus or 32 serial Set s
5. s n Jarrett 1682 The TPW cell is maintained in a strain annealed state in a stirred water bath at 0 008 C In the TPW thermometer well the thermal transfer fluid is de ionized water with 2 isopropyl alcohol and a brass bushing of 5 cm length is used for good thermal contact between the measurement section of the SBE 35 including its tip bushing and the thermometer well wall The SBE 35 data were acquired with the 29 Jun 95 calibration coefficients and Ncycles 16 and the data set further averaged with the program BINAVG using bin 16 scans The average measured temperature was 0 009626 1G 3 11 hour time series of measurements of SBE 35 s n 1 in a gallium melt point cell GaMP s n Isotech 114 The GaMP cell is melted in a Isotech gallium oven The thermal transfer fluid is de ionized water injected at a temperature of 58 C to insure an inner melt A thermometer well brass bushing is also used in the gallium cell The SBE 35 was inserted into the well at about 35 C to preserve the inner gallium melt and data were acquired with the 29 Jun 95 calibration coefficients and Ncycles 16 Before plotting the data were further averaged with BINAVG using bin 16 scans The melt plateau temperature is taken to be the average of temperatures on the upper plateau between hours 8 5 to 9 5 and is 29 764336 C SEA BIRD ELECTRONICS INC 1808 136th Place N E Bellevue Washington 98005 USA Phone 206 643 9866 Fax 206 643 9954 Internet seabird seab
6. select zero ohms wait 0 1 seconds for the output to stabilize average for 0 267 seconds this is NZ select reference resistor wait 0 1 seconds for the output to stabilize average for 0 267 seconds this is NR select thermistor wait 0 1 seconds for the output to stabilize average for 0 267 seconds this is NT The total time per cycle is 1 1 second The number of the above acquisition cycles per measurement is programmable Increasing the number of cycles per measurement increases the time to acquire the sample while reducing the RMS temperature noise from the sensor The following RMS noise values are typical for a SBE 35 in a triple point of water cell Ncycles Acquisition Time Standard Deviation C 8 8 8 seconds 0 000029 32 35 2 seconds 0 000014 Temperature is computed using the Steinhart Hart polynomial for thermistors Steinhart and Hart 1968 Bennett 1972 as follows n is the output from the SBE 35 toor 1 0 273 15 a0 alln n a2ln n a3ln n ain n too slope x too offset deg C ITS 90 Carrying the polynomial to fourth order captures the non linearity of the SBE 35 thermistor output to better than 0 0001 C See Figure 1 in back of manual 6 Calibration Section 6 Calibration Following the methodology used for standards grade platinum resistance thermometers SPRT the calibration of the SBE 35 is accomplished in two steps described below This section also describes fix
7. 000029 sqrt 8 ncycles C SBE 35 is used with a SBE 911plus CTD and Carousel SBE 35 is used with a SBE 19 or 25 CTD and Carousel Set the sample number to N Set N to 0 at the beginning of a cast after all previous data has been downloaded from the SBE 35 3 SBE 35 Commands DDMMYY ddmmyy Set current day month and year This command must be followed by HHMMSS command to set the time MMDDYY mmddyy Set current month day and year This command must be followed by HHMMSS command to set the time DDMMYY and MMDDYY commands are equivalent Either one can be used to set the date HHMMSS hhmmss Set the current hour minute and second Example To set the current date and time to 10 January 1997 12 00 00 MMDDY Y 011097 HHMMSS 120000 or DDMMYY 100197 HHMMSS 120000 ACQUISITION Bottle Confirm ts cal Whenever the SBE 35 receives a valid bottle confirmation sequence a character with decimal value 6 followed by a character with decimal value greater than 48 and less than 84 it takes a measurement ncycles in duration and stores the date time bottle number maximum minimum thermistor value and sensor output in EEPROM Take one sample and store it in EEPROM Sample continuously do not compute temperature do not store samples Output Format column 1 column 2 column 3 column 4 column 5 column 6 column 7 zero value reference resistor value thermistor value maximum minimum
8. 100 C While temperatures are reported to micro degree level we believe the reliable resolution of temperature with this system is presently about 20 000025 C The time drift rate of the SBE 35 is expected to be less than 0 001 C year based on bench tests of the circuit and our experience with the super stable SP 60 thermistors in other Sea Bird instruments e g SBE 16 It is possible that the initial drift of the sensor will exceed the anticipated limit for a few months due to manufacturing stresses placed on circuit components Fixed Point Calibration Slope and Offset As with SPRT methodology the basic certification of the SBE 35 sensor is performed by calibration measurements in thermodynamic fixed point cells The slope and offset terms are determined by placing the SBE 35 in triple point of water and gallium melt point cells after the SBE 35 has been linearized The number of cycles to average was set to 16 IMPORTANT Set the slope to 1 0 and the offset to 0 0 using the slope and offset commands before performing the fixed point calibration Figure 2 shows data taken in a triple point cell Figure 3 shows the gallium melt curve The reported temperatures are calculated using the 29 Jun 95 linearization with slope set to 1 0 and offset set to 0 0 Triple Point Of Water Defined temperature ITS 90 0 010000 C Hydrostatic head effect 0 0073 mdeg cm In our triple point of water cell Jarrett 1982 the hydrostat
9. 21 val 509867 4 t90 8 752342 0 30 Sep 1998 10 29 29 bn 1 30 Sep 1998 10 31 00 bn 2 30 Sep 1998 10 31 30 bn 3 30 Sep 1998 10 32 00 bn 4 30 Sep 1998 10 32 30 bn 5 30 Sep 1998 10 33 00 bn diff 268 val 278061 1 diff 84 val 277430 6 diff 140 val 277357 8 diff 357 val 277163 3 diff 367 val 277055 7 diff 409 val 276487 1 NUR CALIBRATION COEFFICIENTS caldate sssss set the calibration date to sssss factory programmed ta0 F set AO coefficient F factory programmed tal F set Al coefficient F factory programmed ta2 F set A2 coefficient F factory programmed ta3 F set A3 coefficient F factory programmed ta4 F set A4 coefficient F factory programmed offset F set the offset to F slope F set the slope to F TESTING rtctest Test battery backed static RAM in the real time clock module eetest Test the EEPROM memory Allow 30 seconds for this test to complete This command will destroy all data stored in the EEPROM and will overwrite the calibration coefficients Both the rtctest and eetest overwrite data stored in the SBE 35 SRAM Re set the date time and number of cycles to average after running these commands 4 Operating the SBE 35 Section 4 Operating the SBE 35 Operation with CTD s and Carousel Water Sampler This section will describe SBE 35 operation with Sea Bird CTD s and the Carousel Water Sampler and fixed point cells At sea the SBE 35
10. SBE 35 Deep Ocean Standards Thermometer User s Manual Sea Bird Electronics Inc 1808 136 Place NE Bellevue Washington 98005 USA Tel 425 643 9866 Fax 425 643 9954 Limited Liability Statement Extreme care should be exercised when using or servicing this equipment It should be used or serviced only by personnel with knowledge of and training in the use and maintenance of oceanographic electronic equipment SEA BIRD ELECTRONICS INC disclaims all product liability risks arising from the use or servicing of this system SEA BIRD ELECTRONICS INC has no way of controlling the use of this equipment or of choosing the personnel to operate it and therefore cannot take steps to comply with laws pertaining to product liability including laws which impose a duty to warn the user of any dangers involved in operating this equipment Therefore acceptance of this system by the customer shall be conclusively deemed to include a covenant by the customer to defend indemnify and hold SEA BIRD ELECTRONICS INC harmless from all product liability claims arising from the use or servicing of this system Table of Contents Section 1 Introduction About this manual Section 2 Communication with the SBE 35 System Description csse Communication with SBE 35 Section 3 SBE 35 Commands Section 4 Operating the SBE 35 Operation with CTD s and Carousel Water Sampler
11. Yellow Springs Instruments standards grade platinum resistance thermometers YSI 8163Q s n 4747 4749 maintained and used exclusively in the temperature range 5 to 40 C SPRT resistance ratios are measured with a Automated Systems Laboratory ASL F18 resistance bridge using methodology of the US National Institute of Standards and Technology NIST Primary Temperature Standards Laboratory The SPRTs are calibrated and certified against a group of four triple point of water cells Jarrett s n 461 716 1682 1683 and one gallium melt point cell Isotech s n 114 A second gallium melt cell from the US NOAA Calibration Laboratory is also periodically used Following NIST methodology the TPW cell mantles are prepared and stress annealed for two weeks before use The cells are maintained in a temperature bath held at 0 008 C where they are used for several months before the mantles must be melted and rebuilt The thermal transfer fluid used in the cell thermometer wells and maintenance bath is de ionized water with 2 isopropyl alcohol and a brass bushing 5 cm length is used to couple the SPRT to the TPW thermometer well wall The gallium melt cells are cycled through a 10096 melt in a commercial Isotech gallium furnace De ionized water and a brass bushing are used as the thermal transfer media in the thermometer well The inner melt of the gallium ingot is initiated by injecting 58 C de ionized water into the thermometer well and thermometers are
12. amplenum to zero and run SEASAVE to acquire the CTD cast The SBE 35 will take a sample each time it receives a bottle confirmation and store the data in EEPROM If a second bottle is fired before the SBE 35 finishes sampling 1 1 ncycles 2 seconds the SBE 35 will ignore the second bottle confirmation After the CTD cast run TERM 35 Press Function Key 9 to upload the data The data file will be stored with a ASC extension Run DATCNV In Water Bottle Set Up select scans marked with bottle confirm bit as the source of scan range Set offset to 0 0 and duration 1 1 ncycles Use with a SBE 19 or 25 CTD and Carousel Water Sampler 1 Connect the SBE 33 deck unit modem channel to a PC using a straight through serial cable P N 80073 Connect the SBE 35 to the Carousel water sampler using cable SBE 171221 DWG 32209 This is not a straight through cable Connect the end labeled SBE 35 to the SBE 35 and the end labeled SBE 32 to the Carousel For the calibration comparison application mount the SBE 35 without tip bushing the desired secondary SBE 3 and 1200 rpm secondary pump into the 3 35 calibration frame that is supplied Power the Carousel with the SBE 33 deck unit Run TERM 35 and send the display status command DS to verify communication with the SBE 35 If no reply is received press F2 to bring up the setup form select communication set up and check the COMM port setting In addition check that the bottl
13. can act as a stand alone substitute for a reversing thermometer recording temperature with each bottle closing In this application the SBE 35 is mounted in a secure area on the water sampler frame where the ocean water flushes freely and there is minimal contamination from the passive thermal mass of the metal frame or active thermal dissipation from electronic instruments Alternately the SBE 35 can be used as a in situ temperature calibrator for the SBE 3plus temperature sensors used on the SBE 911plus or SBE 25 CTDs In this application the SBE 35 is mounted in the 3 35 calibration frame This frame places the measurement tips of the SBE 35 and SBE 3 in a plenum duct through which an auxiliary pump draws a constant vigorous flow of the ambient seawater this arrangement insures that temperature averages from both instruments correspond to the same water evaluated at the same time Heat shed from the passive thermal mass of the CTD water sampler frame and from active dissipation of electronic instruments can alter in situ water temperature at small scales by several millidegrees A temperature comparison is made each time a water bottle is closed The best comparison measurements are expected in deep isothermal water With good calibration locks of the SBE 35 in fixed point cells before and after a cruise we expect the offset drift of the SBE 3 temperature sensor to be measured in situ to a precision of better than 0 0005 C The SBE 35 has
14. e confirm interface is correct for the application If not type interface and either 91 Iplus or 32serial Set samplenum to zero and run SEASAVE to acquire the CTD cast The SBE 35 will take a sample each time it receives a bottle confirmation and store the data in EEPROM If a second bottle is fired before the SBE 35 finishes sampling 1 1 ncycles 2 seconds the SBE 35 will ignore the second bottle confirmation After the CTD cast run TERM 35 Press Function Key 9 to upload the data The data file will be stored with a ASC extension Run DATCNV In Water Bottle Set Up select scans marked with bottle confirm bit as the source of scan range Set offset to 0 0 and duration 1 1 ncycles 4 Operating the SBE 35 Operation in Fixed Point Cells For calibration measurements in thermodynamic fixed point cells a brass and white plastic tip bushing is used to give the SBE 35 a length diameter and thermal averaging characteristic that mimics the standards grade platinum resistance thermometer SPRT TJ Back eA Connect the SBE 35 to the 90248 opto box and run TERM35 Press Enter and the S gt prompt should be displayed Use the NCYCLES command to change the number of cycles to average Fill the brass and white plastic tip bushing with the same thermal transfer fluid used in the fixed point cell ex de ionized water with 246 isopropyl alcohol Use a syringe to fill the tip bushing from the bottom so that air b
15. ed point calibration Note Figures 1 3 are located in back of manual The first step is to characterize and capture the non linear resistance vs temperature response of the sensor Because it is important that fit equations reflect underlying physical mechanisms the Steinhart Hart equation is a good choice By including terms through fourth order this equation characterizes the SBE 35 output to an error less than 0 0001 C Figure 1 Unlike SPRTs where the basic non linear calibration equation has fixed coefficients that apply to all thermometers thermistors require individualized coefficients to the Steinhart Hart equation because unlike pure SPRT platinum the thermistor material is an individualized mix of dopants The individualized SBE 35 calibrations are performed at Sea Bird in a low gradient temperature bath and against ITS 90 certified SPRTs maintained at Sea Bird s primary temperature metrology laboratory The calibration process is described below The second step is frequent certification of the sensor by measurements in thermodynamic fixed point cells Triple point of water TPW and gallium melt point GaMP cells are appropriate for the SBE 35 which is designed for ocean range temperatures 5 to 35 C Like SPRTs the slow time drift of the SBE 35 is adjusted by a slope and offset correction to the basic non linear calibration equation The Sea Bird primary temperature standard consists of two
16. ic head is 0 000198 C thus true measured temperature in triple point of water t 0 010000 0 000198 0 009802 C and actual measured temperature from SBE 35 m 0 009626 C 6 Calibration Gallium Melt Point Defined temperature ITS 90 29 764600 C Hydrostatic head effect 0 01165 mdeg cm Atmospheric pressure effect 2 0uK millibar In our gallium melt point cell Isotech 114 the hydrostatic head is 0 000272 C and the barometric pressure was approximately 1010 millibars thus true measured temperature in the gallium cell t 29 764600 0 000272 0 000007 29 764335 C and actual measured temperature from SBE 35 using a 60 minute average beginning 8 5 into the melt cycle m 29 764336 C slope t t m m 0 999994 offset t slope mj 0 000176 Program the new slope and offset into the SBE 35 using the slope and offset commands Figure Descriptions 1 Sea Bird calibration certificate for SBE 35 s n 1 The coefficients are for the 29 Jun 95 calibration data Bath temperatures were measured with Sea Bird s SPRT s n 4747 calibrated 03 January 1995 and showing recent triple point of water and gallium melt point checks within 0 000050 of correct We expect the transfer errors in the bath to be within 0 000250 C The overall calibration accuracy is expected to be within 0 000500 C 2 48 hour time series of measurements of SBE 35 s n 1 in a triple point of water cell TPW
17. ird com SENSOR SERIAL NUMBER 1 TEMPERATURE CALIBRATION DATA CALIBRATION DATE 29 jun 95 ITS 90 TEMPERATURE SCALE SBE 35 COEFFICIENTS a0 5 353396734e 03 al 1 486906682e 03 a2 2 157446016e 04 a3 1 191723910e 05 a4 2 520670077e 07 BATH TEMP INSTRUMENT INST TEMP RESIDUAL ITS 90 C OUTPUT n ITS 90 C ITS 90 C 1 432584 802788 41 1 432534 0 000050 1 072655 718708 32 1 072573 0 000082 4 568224 617253 29 4 568205 0 000019 8 166711 529182 82 8 166776 0 000065 11 596517 458145 25 11 596549 0 000032 15 156793 395526 94 15 156779 0 000014 18 660757 343166 34 18 660709 0 000048 22 156465 298608 23 22 156463 0 000002 25 719453 259824 40 25 719441 0 000012 29 132353 227964 82 29 132408 0 000055 32 668212 199568 37 32 668188 0 000024 Temperature ITS 90 1 a0 al n n a2 n n a3 7 n a4 n n 273 15 C Residual instrument temperature bath temperature calibration delta T 0 0020 nM date mdeg C1 29 jun 95 0 00 0 0010 RESIDUAL Degrees C 0 0000 0 0010 0 5 10 15 20 25 30 35 TEMPERATURE Degrees C 0 0020 5 FIGURE 1 awt Sunou 10 12 14 16 18 20 22 000 000 000 000 000 000 090 000 000 000 000 TPW78A16 CNV SBE 35 temperature 0 010 SBE 35 S N 1 in TPW cell 1682 0 011 avg 16 FIGURE 2 awt S4nou 10 12 000 000
18. o the SBE 35 and buffers the serial communication lines in order to minimize noise input to the SBE 35 from external sources 2 Connect the 90248 to a serial port on a PC with a straight through cable P N 80677 The SBE 35 communicates at 300 baud 8 data bits no parity Note The orange LED will flash when the SBE 35 transmits The green LED will flash when the PC transmits 3 The SBE 35 will transmit SBE 35 wake up three seconds after the 90248 opto box is powered on 2 Communication with the SBE 35 Section 3 SBE 35 Commands This section describes the commands associated with TERM35 as part of SEASOFT Command Descriptions STATUS ds dc Display Status A typical reply would be SBE35 V2 0 SERIAL NO 0013 01 Oct 1998 15 56 52 number of measurement cycles to average 8 number of data points stored in memory 2 bottle confirm interface SBE 911plus S gt Display Calibration Coefficients A typical reply would be SBE35 V 2 0 SERIAL NO 0013 09 apr 97 A0 5 156252707e 03 A1 1 430180396e 03 A2 2 092145355e 04 A3 1 156278215e 05 A4 2 446454055e 07 SLOPE 1 000000 OFFSET 0 000000 S gt SET UP ncycles N interface 91 1 plus interface 32serial samplenum N Set the number of measurement cycles per acquisition to N Each acquisition cycle is 1 1 seconds in duration In a thermally quiet environment the temperature noise standard deviation is 0
19. pre heated to above 30 C before insertion to insure the inner melt is preserved The June 1995 calibration checks of SPRT s n 4747 used to calibrate the SBE 35 show it to be within 40 000050 C of ITS 90 We expect SPRT readings at 15 C to be within 0 000100 C of ITS 90 6 Calibration The SBE 35 obtained its linearization calibration in a bath used to calibrate the Sea Bird temperature transfer standards to our SPRTs The bath is a computer controlled highly insulated bath of 50 liters volume stirred and mixed to obtain temperature uniformity of better than 40 000250 C Calibrations are made at 11 points equally spaced from 1 5 to 32 5 C At each point the bath is allowed to equilibrate for one hour When the computer judges bath stability and variance to be acceptable a 600 second synchronous integration of data from all sensors is obtained and tested for conformance to high stability and variance criterion The 600 second integrations are repeated until all data pass the test and the computer then moves the bath to the next temperature point Experiments indicate that the calibration transfer error from the SPRT to other sensors is within 30 000250 C The total accuracy of calibration is expected to be within 30 000500 C The results of the SBE 35 calibration are shown in Figure 1 Bath temperature is obtained from the SPRT s n 4747 The Steinhart Hart equation taken to 4 th order fits the calibration data to within 40 000
20. ubbles are not trapped inside Screw the bushing onto the SBE 35 probe tip and place the probe in the cell Adjust the SBE 35 probe temperature to 1 C warmer than the fixed point temperature to make sure the inner melt of the fixed point cell is maintained Type RUN to start continuous sampling Press F5 to start capturing data Data from the SBE 35 will be displayed on the screen and written to a file on disk Use an editor to extract the stable converted data of interest 5 Measurement Cycle Section 5 Measurement Cycle This section provides description of measurement cycle for the SBE 35 The SBE 35 determines temperature by applying a 1 2 kHz AC excitation to a reference resistor zero ohms and an ultrastable thermistor and digitizing the output from each with a 20 bit delta sigma A D converter The reference resistor is a hermetically sealed VISHAY VHP202K inside a temperature controlled oven The switches are All Position mercury wetted reed relays with a stable contact resistance AC excitation and ratiometric comparison using a common processing channel removes measurement errors due to parasitic thermocouples offset voltages leakage currents and gain errors Maximum power dissipated in the thermistor is 5e 7 watts NR output from the reference resistor NZ output from zero ohms NT output from the thermistor Output from the sensor 1048576 NT NZ NR NZ Each acquisition cycle is
21. zero value maximum minimum reference resistor value maximum minimum thermistor value sensor output n A typical output with the SBE 35 in a triple point of water cell with the number of cycles per measurement 16 is 197 21 197 87 197 64 198 08 197 73 197 91 197 71 1047557 1047563 1047565 1047566 1047554 1047555 1047551 752453 3 15 31 27 753130 0 7524574 15 31 21 753129 0 752459 1 15 32 18 753129 5 752459 9 19 30 21 753129 5 752451 2 13 34 28 753129 6 7524514 17 30 27 7531292 7524491 14 27 21 7531292 3 SBE 35 Commands run Sample continuously compute temperature do not store samples The output format is the same as in Page 8 but with computed temperature added in the eighth column Although the total time per measurement cycle is 1 1 ncycles seconds the time between sample updates is 1 1 ncycles 2 7 seconds The extra time is spent converting the measured values to computed temperature and transmitting the data at 300 baud DATA UPLOAD dd Dump all the data ddB E Dump scans B through E The format is column 1 sample number column 2 3 date and time DD MMM YYYY HH MM SS column 4 bottle position column 5 maximum minimum thermistor value column 6 sensor output n column 7L computed temperature ITS 90 A sample output with the SBE 35 taking data in room ambient air is 130 Sep 1998 16 15 13 bn 8 diff 19 val 509867 0 t90 8 752364 2 30 Sep 1998 16 15 41 bn 6diff
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