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Micro CTD User Manual - Ocean Networks Canada

1. Press ESC to return Figure B 1 Communication parameters window in PROCOMM If all cables have been connected properly and the appropriate baud rate serial port combination chosen the instrument will respond with a header and then the prompt gt eg MC3 Version 3 04 Apr 13 07 SN 7455 Copyright c 2005 2006 AML Oceanographic gt Once the prompt appears the Micro CTD Sensor is ready to accept instructions Refer to the RS 232 Command Summary in section 5 1 2 To leave PROCOMM the lt ALT gt X key combination is used 61 User Manual for AML Oceanographic s Micro CTD Sensor APPENDIX C Wiring Diagram See Instrument Wiring Diagram included on the User Documentation CD 62 User Manual for AML Oceanographic s Micro CTD Sensor APPENDIX D 32 Bit CRC Calculation and Table Cre 32 Calculation Below is a look up table and function to compute the running total of a 32 bit crc const long int Crc32Table 256 PROGMEM 0x00000000 0x77073096 Oxee0e612c 0x990951ba 0x076dc419 0x706af48f 0xe963a535 0x9e6495a3 Ox0edb8832 0x79dcb8a4 OxeO0d5e91e 0x97d2d988 0x09b64c2b 0x7eb17cbd 0xe7b82d07 Ox90bf1d91 Ox1db71064 0x6ab020f2 0xf3b97148 0x84be41de Ox ladad47d Ox6ddde4eb Oxf4d4b551 0x83d385c7 0x136c9856 0x646ba8c0 Oxfd62f97a 0x8a65c9ec 0x14015c4f 0x63066cd9 Oxfa0f3d63 0x8d080df 5 0x3b6e20c8 0x4c69105e 0xd56041e4 0xa2677172 0x3c03e4d1 0x4b04d447 0xd2
2. T A B Nt C Nt D Nt E Nt F NC G N Where T temperature in C Nt raw value A through G are calibration coefficients determined at the factory 55 User Manual for AML Oceanographic s Micro CTD Sensor 8 3 8 4 8 5 PRESSURE The pressure electronics use the following formula to convert raw data to engineering units dbar P A B Npt C Npt D Npt E F Npt G Npt H Npt Np 1 J Npt K Npt L Npt Np Where P pressure in dbar Npt Np raw values A through L are calibration coefficients determined at the factory BATTERY EXTERNAL VOLTAGE The voltage measurement is done on the logger board and uses the following formula to convert raw data to engineering units volts V A B Nb Where V voltage in volts Nb raw value A and B are calibration coefficients determined at the factory OPTIONAL 65 C TEMPERATURE The temperature electronics use the following formula to convert raw data to engineering units C T A B Nt C N D NE E NC F NC G N H NC NC Where T temperature in C Nt raw value A through I are calibration coefficients determined at the factory 56 User Manual for AML Oceanographic s Micro CTD Sensor 9 WARRANTY Warranty and limit of liability AML oceanographic warrants the instrument for a period of one year from the date of delivery AML oceanographic will repair or replace at its option and at no charge components that prove to be
3. This command will enable the displaying of salinity channel during a data scan Please note Salinity is calculated from depth temperature and conductivity and is not stored in the Micro CTD s memory 28 User Manual for AML Oceanographic s Micro CTD Sensor 5 3 2 5 Set Start up Options Commands Command SET STARTUP DELAY SE ST D nnn The Startup Delay time is defined as the time difference between the logger board powered up and when the sensor boards are powered up The time nnn is entered in 0 02 second intervals Maximum startup delay is 255 or 5 seconds This command may be used for a gentle power on to power up the instrument in stages thus avoiding large power up current spikes that may result when using long cables or batteries with high internal resistances Example gt SET STARTUP DELAY 200 set the startup delay to 4 seconds In the above example 4 seconds after the Micro CTD is powered up the sensor boards will be powered up startup delay l on power on sensor board p on sensor scan delay Figure D 2 Micro CTD Power up Timing Diagram Command SET STARTUP HEADER SE ST H Display the header at power on Use SET STARTUP NOHEADER to disable header Command SET STARTUP NOHEADER SE ST N Do not display the header at power on Use SET STARTUP HEADER to enable header Command SET STARTUP SCAN SE ST S This command sets the Micro CTD to autom
4. lt 3 meters should have less than Y2 ohm from end to end on each conductor The cable should have a short between pins 6 7 and 8 Refer to the wiring diagram in Appendix B If any of these conditions are not met replace the cable Incorrect power is being applied to the instrument Check with a volt ohm meter for proper supply voltage The voltage range is from 8 to 24 VDC Please refer to the appendix C Electrical Wiring Diagram Problem The sensor readings are noisy Solutions There are nearby electromagnetic noise sources Move the instrument to a new location or move the noise source Refer to section 6 2 f only one sensor reading is noisy determine which sensor channel it is and refer to the de sensor readings are incorrect section for that sensor which are listed below The power supplied to the instrument is noisy Change the power supply to a more regulated power supply or use a battery Problem The conductivity sensor readings are incorrect Solutions The conductivity sensor has a bubble in the glass tube Shake the instrument to clear the bubble The conductivity sensor has completely dried out and has not been allowed to fully wet before use Rinse the conductivity sensor with a dilute solution of water alcohol and dish soap then rinse the sensor with fresh water and let it sit in the water sample for 5 minutes before taking a reading The conductivity sensor is faulty Examine the conduct
5. 0x38d8c2c4 Ox4fdff252 Oxd1bb67f1 0xa6bc5767 Ox3fb506dd 0x48b2364b Oxd80d2bda Oxaf0alb4c 0x36034af6 0x41047a60 Oxdf60efc3 0xa867df55 0x316e8eef 0x4669be79 Oxcb61b38c 0xbc6683 1a 0x256fd2a0 0x5268e236 Oxcc0c7795 Oxbb0b4703 0x220216b9 0x5505262f Oxc5ba3bbe Oxb2bd0b28 0x2bb45a92 0x5cb36a04 Oxc2d7ffa7 Oxb5d0cf31 0x2cd99e8b Ox5bdeaeld 0x9b64c2b0 0xec63f226 0x756aa39c 0x026d930a 0x9c0906a9 Oxeb0e363f 0x72076785 0x05005713 0x95bf4a82 Oxe2b87al 4 0x7bb12bae 0x0cb61b38 0x92d28e9b OxeS5d5be0d Ox7cdcefb7 OxObdbdf21 0x86d3d2d4 Oxf1d4e242 0x68ddb3f8 0x 1fda836e 0x81be16cd Oxf6b9265b 0x6fb077e1 0x 18674777 0x88085ae6 Oxff0f6a70 0x66063bca 0x11010b5c Ox8f659eff Oxf862ae69 0x61 6bffd3 Ox166ccf45 Oxa00ae278 Oxd70dd2ee 0x4e048354 0x3903b3c2 0xa7672661 0xd06016f7 0x4969474d 0x3e6e77db Oxaed16a4a Oxd9d65adc 0x40df0b66 0x37d83bf0 Oxa9bcae53 Oxdebb9ec5 Ox47b2cf7f Ox30b5ffe9 Oxbdbdf21c Oxcabac28a 0x53b39330 0x24b4a3a6 Oxbad03605 Oxcdd70693 0x54de5729 0x23d967bf 0xb3667a2e 0xc4614ab8 0x5d681b02 0x2a6f2b94 Oxb40bbe37 Oxc30c8eal 0x5a05df1b Ox2d02ef8d h void Crc32Compute unsigned long Crc unsigned char byte Crc amp Crc32Table Crc amp Oxff byte Cre gt gt 8 63 User Manual for AML Oceanographic s Micro CTD Sensor APPENDIX E Quick Guide Micro CTD Sensor Caution Do not exceed the maximum pressure rating of this
6. Optional communication boards include RS 485 and TTL Through the communications board the instrument will on power up automatically detect baud rates from 2400 to 38400 baud The baud rate is automatically determined when the sensor receives an ENTER or lt RET gt The data output may be configured to display either unprocessed integers or computed engineering values The Micro CTD Sensor has the option of sampling on command or monitoring continuously with programmable sampling rates The latter is not available with the binary protocol The RS 485 binary protocol option allows the instruments to be individually addressed permitting multiple instruments to be daisy chained together The standard pressure case is acetal with a depth rating of 500 meters of water Optionally the 316 stainless steel pressure case is rated to 4500 meters and the titanium case is rated to 6000 metres The standard bulkhead connector used on the Micro series of instrumentation is the Impulse MCBH 8 FS rated to 6800 meters of water The O to 65 C temperature range option uses the same sensor but utilizes custom electronics and a higher order calibration equation Note the extended temperature range does not apply to the conductivity and pressure sensors User Manual for AML Oceanographic s Micro CTD Sensor 1 2 THE USER This manual has been written with the following assumptions The user has had some exposure to MS Windows compatible comp
7. 65 C Temperature Sensor Precision aged thermistor in 316 SS housing Range 2 to 65 C Accuracy 0 01 C Resolution 0 002 C Time constant 100ms Output format Standard RS 232C fixed baud or autobaud communications Baud rate 2400 to 115200 baud 8 data bits no parity 1 stop bit autobaud up to 38400 baud Data type ASCII text User Manual for AML Oceanographic s Micro CTD Sensor Optional Baud rate Data type Optional Baud rate Data type Sample Rate Power Standard Range Nominal Current RS 485 fixed baud or autobaud communications 2400 to 115200 baud 8 data bits no parity 1 stop bit autobaud up to 38400 baud ASCII text RS 485 fixed baud communications 2400 to 115200 baud 8 data bits no parity 1 stop bit Addressable binary network format On command or continuous Continuous has programmable sampling rates from 25 scans second to scan per day Note that fast sampling rates may be degraded by the baud rate and output formats chosen External power 8 to 24 volts D C 12 volts D C 100 mA electronics are galvanically isolated from the water Optional Memory Standard Options Pressure Housing Dimensions Material Max Pressure Optional Max Pressure Optional Max Pressure External battery pack 3 C lithium cells 7000 mAhr Recommended batteries are Saft LSH 14 C cell 3 6 volt lithium No memory 128M 256M 512M and 1 G bytes 5
8. Enables reception of characters at the next power up Command SET TIMEOUT SE TIMEO nn Where nn is time in minutes and represents an integer value from 0 to 30 This command instructs the Micro CTD to enter a logging mode after a specified time interval has passed in which the instrument has been idle A time interval of 0 will deactivate the command Use the DIS ST command to view the timeout value NOTE you can exit logging mode by either Power the Micro CTD off then on or press a keyboard key if the SET BREAK ON is enabled 26 User Manual for AML Oceanographic s Micro CTD Sensor Example gt SET TIMEOUT 10 The above example will instruct the Micro CTD to enter the logging mode if it sits idle at the command prompt for more than ten minutes gt SET TIMEOUT 0 disable the timeout feature 5 3 2 4 Set Scan Options Commands Command SET SCAN DELAY SE SC D nnn The scan delay is defined as the time between the sensor board power up and a scan of data The time nnn is entered in 0 2 second intervals Maximum scan delay is 255 or 51 seconds This command is used for sensors that have a slower power up response time Example gt SET SCAN DELAY 150 sets the scan delay to 30 seconds In the example below the Micro CTD would power up the sensor boards wait 30 seconds then take a scan of data startup delay on power EN p on sensor board p l on sensor scan pa b
9. F 1 422841E 09 G 1 158846E 11 H 3 654345E 14 Threshold 500 Conductivity fresh A 3 055426E 04 B 6 805635E 38 C 6 805635E 38 D 6 805635E 38 E 6 805635E 38 F 6 805635E 38 G 6 805635E 38 H 6 805635E 38 Threshold 2000 Using salt water coefficients gt Press ctrl c to exit the talk mode Command SET SALT THRESHOLD n SE SAL THRESH n This command sets the logging threshold for the raw conductivity Nc channel when in salt water mode Above this count the instrument will assume an in water condition and begin logging if it is in configured to log Note that this command must be used while in TALK mode with the conductivity sensor Example gt SET SALT THRESHOLD 500 Command SET FRESH THRESHOLD n This command sets the logging threshold for the raw conductivity Nc channel when in fresh water mode Above this count the instrument will assume an in water condition and begin logging if it is in configured to log Note that this command must be used while in TALK mode with the conductivity sensor Example gt SET FRESH THRESHOLD 450 In air the conductivity count is typically 0 Typical count thresholds for salt and fresh are 500 and 450 counts respectively Pressure and Temperature Pressure Command SET Pn c Where n coefficient letter a b c d e f g h 1 k l c calibration coefficient 37 User Manual for AML Oceanographic s Micro CTD Sensor Example gt talk 3 Entering talk mode 3 P
10. TOMA uei oett tree porn eene enero 17 SdL Header Outputs eee a 17 3 991 2 R al Output e 18 25 3 4537 Raw Output Mode itio e tre EE o erba Erb R P ERR Reo Y Mean 18 A o ceto peter A 19 5 3 2 1 Basic Set Up Comm a 19 5 3 2 2 Basic Display Commander 21 5 3 2 3 Communications Set up Commands sss 23 5 3 2 4 Set Scan Options Commands esee 2 5 3 2 5 Set Start up Options Comrmnands ettet aca 29 5 3 2 6 Sensor Board General Commands 5 teet etate 3l 5 3 2 7 Editing the Calibration Coefficients esses 36 5 3 2 8 Og lA tuer ker e ru tee 40 5 3 2 9 Optional Current Loop Data Output Board Commands 44 o O 45 0 ii Logging siisii uooti otsoen NE ERE SEES RENE SERRE MEER vd 45 9 9 92 Tethered Loring Lesser rer rre Pa e roget 46 6 PRECAUTIONS AND TROUBLESHOOTING GUIDE eene 47 6 1 PIC CANTONS 3 peor tata eNotes NaN EE DEC PN UN EARN ER CR 47 User Manual for AML Oceanographic s Micro CTD Sensor 6 1 1 Conductivity Cell Precautions wnccue seinen ae 6 1 2 Pressure Sensor Precautl Ons esiste tetas etetetiastetiadatiatasiaeeis 6 1 3 Optional Sensor Precautions sacada 6 2 Sens r InteractionS e sene tr tala a Sl Sl ht Se A il A ets uM ant ca el Al Ge 6 2 1 Electrical Iuterfetence aoc e erac aca D A i ua 6 2 2 Magnete InteHeteDGCE erect teu re RR ene e SERA SNR RSS UR UE eR E SR S SR RR E S 0 23 Radio Interference atra o Nata ot
11. batteries will last The higher the Amp Hour rating the longer the battery will last and the more it will cost Current capacity not only varies with temperature but also with the load how much current the instrument draws A rough calculation for battery life is hours 2 Ah load Where Hours hours of battery use Ah Amp Hour rating of the battery Load how much current the instrument draws in Amps Maximum current sourcing capabilities The maximum current sourcing capabilities of a lithium battery defines how much current the battery can source before its voltage will drop significantly Batteries with a low rating of Maximum recommended continuous currents below 800ma may produce a sharp voltage drop when the Micro CTD demands a burst of current such as when it powers up or when an optional sensor or pump is turned on If the voltage drops below the Micro CTD s operational voltage the instrument may reset itself or behave erratically 54 User Manual for AML Oceanographic s Micro CTD Sensor 8 1 8 2 CALIBRATION The instrument was calibrated at the factory at the time of manufacture This should remain within published specifications for periods of 1 to 2 years depending on the amount of use and other conditions occurring in the deployment environment The sensor accuracies are also dependent upon proper care and maintenance by the user AML Oceanographic recommends recalibrating the instrument annually however some
12. c 2000 2005 AML Oceanographic gt S 00 001 gt SET FOR 41 set the conductivity output format to xxxx x gt S 0000 0 gt SET FOR 32 set the conductivity output format to xxx xx gt S 000 00 gt lt CTRL C gt Exiting talk mode Command SET XFORMAT AB SET XFOR AB This command while in TALK mode with a dual sensor board such as the PT board or analog board will set the real output format X is the sensor designator Le P for pressure T for temperature 1 for analog channel 1 and 2 for analog channel 2 A is the number of digits ahead of the decimal place and B is the number of digits after the decimal place To exit the talk mode use the CTRL C command After exiting talk mode use the detect command to update the formats on the logger board as well Powering down the instrument will also update the logger board Example gt TALK 3 enter talk mode with the PT board in slot 3 Entering talk mode 3 Pressure and Temperature Micro Sensor V2 07 SN 3718 PT Copyright c 2000 2005 AML Oceanographic gt S 0000 09 23 455 gt SET PFOR 31 set the pressure output format to xxx x gt SET TFOR 32 gt S 000 0 023 56 gt SET PFOR 42 35 User Manual for AML Oceanographic s Micro CTD Sensor gt SET TFOR 23 gt S 0000 06 23 565 gt lt CTRL C gt Exiting talk mode 5 3 2 7 Editing the Calibration Coefficients The instruments calibration coefficients are stored in the Micro CTD s memory The
13. compatible computer or data collection device An AML supplied data cable will link the two Refer to the wiring diagram on the user s CD At one end of the cable is a DB9 female connector that plugs into the computer s serial port and at the other end is a 8 pin plug that is inserted into the communications port of the Micro CTD Sensor When this connection has been made and 12 volts applied the instrument is powered up and ready to communicate with the computer WARNING A plug or cable must be installed in the connector at all times when the instrument is immersed in water Failure to do so will cause corrosion to the connectors and may cause water damage in the electronics housing 12 User Manual for AML Oceanographic s Micro CTD Sensor 4 3 4 3 1 4 3 2 POWERING THE MICRO CTD SENSOR External Power The Micro CTD Sensor is normally powered externally via the communications cable Refer to the wiring diagram on the user s CD If an AML data cable is used attach the red wire to the positive side of the power supply and the black wire to ground The power should be a DC voltage between 8 and 24 volts measured at the instrument The instrument has reverse voltage protection but the instrument will not function if the power leads are connected with reverse polarity Figure 4 3 1 Micro instrument connected to an external power source Micro CTD logging option If the Micro CTD has been purchased with the loggi
14. gt SE P INC 0 1 Command DISPLAY INCREMENT DIS INC This command displays the logging increment for pressure in dBars dBars are approximately equal to meters Example gt DIS INC Logging pressure increment is 0 00 gt Command LOG L This command forces the instrument to go into logging mode from real time mode It will remain in logging mode until the power is turned off Example gt L Note There is no user command to change the mode back to real time if SET BREAK ON is not enabled Command SET LOG SE L filename This command creates a file in memory with the name set by filename for the instrument s logged data The default file name is log raw The filename can be up to 8 characters for the name and 3 characters for the extension The file size is limited only by the size of the memory Example gt SE L filename 40 User Manual for AML Oceanographic s Micro CTD Sensor Command SET BREAK ON This command sets an option to break out of forced logging by sending a any character from the keyboard Example gt SET BREAK ON Command SET BREAK OFF This command disables the SET BREAK ON option Command SET SALT THRESHOLD n SE SAL THRESH n This command sets the logging threshold for the raw conductivity Nc channel in salt water mode Above this count the instrument will assume an in water condition and begin logging if it is in configured to log Refer to the conductivity co
15. mode Command SET STARTUP PROMPT SE ST P This command instructs the Micro CTD to display a prompt at power on If the auto baud feature has not been disabled the Micro CTD will wait for a carriage return before it outputs a prompt See SET DETECT command The following example instructs the Micro CTD to go directly to a prompt at power up Use the SET STARTUP SCAN and SET STARTUP MONITOR commands for alternative startup options Example gt SET DETECT 07 disable the auto baud feature and set the baud rate to 38400 gt SET STARTUP NOHEADER disable the header gt SET STARTUP PROMPT places the Micro CTD in the prompt mode Command SET TIMEOUT SE TIMEO nn This command affects the startup conditions of the instrument as well Refer to section 5 3 2 3 for this command 30 User Manual for AML Oceanographic s Micro CTD Sensor 5 3 2 6 Sensor Board General Commands The Micro CTD allows intelligent sensor and output data boards to be plugged into a selection of board slots on the motherboard The motherboard can detect and identify the board and or sensor type located in each slot Each board stores serial number calibration coefficients configuration and status information as applicable Based on the suite of sensors identified and other configuration information the motherboard creates the data output and storage format and coordinates communications to and from the plug boards and the sensors The user can comm
16. mode is disabled A lookup table and function to compute the running total of a 32 bit CRC is provided in Appendix D When CRC is enabled the CRC value can be obtained for any command by typing a at the end of the command The CRC value will be returned For example gt SET CRC DISABLED The CRC value 1D9598C0 will be displayed at the end of the command line gt SET CRC DISABLED 1D9598C0 CRC mode is disabled Note The CRC is case sensitive When using the to request the CRC the CRC is displayed for the command as it appears When retyping the command with the CRC included the command must be entered exactly as before Put the CRC value in the exact position as the was placed i e space or no space after the command characters All letters in the CRC must be entered as UPPERCASE characters Command SET RXOFF SE RXOFF This command will disable the reception of characters at the next power up The RXOFF command instructs the Micro CTD to ignore any communications from the computer and is used to assure spurious signals due to external noise or long cable lengths do not interrupt the Micro CTD On power up the Micro CTD will wait for 200ms before entering into the RXOFF mode and during this time sending a carriage return will disable the RXOFF features To exit the RXOFF mode hold down the carriage return key and power up the unit then from the prompt issue the SET RXON command Command SET RXON SE RXON
17. requirements are controlled by a dedicated microprocessor for each sensor Each sensor has a dedicated electronics board to provide this functionality Each board is composed of an analog section a digital section and in the case of any sensor electrically coupled to the water an isolation section is also included Refer to Figure 3 1 Signal Interface Electronics 9 p RS 232 adn RS 485 Optional Battery Pack e Vf Y Isolation C Digital C Analog Electronics Electronics yy Electronics C Cell Power Data Logger VC Y Powa yu Power T Digital T Analog Temp Signal e hg Signal Bus Electronics Electronics Sensor Electronics Power P Digital u P Analog Pressure bd Electronics Electronics Sensor m C tae Additional Sensor Channels 10 User Manual for AML Oceanographic s Micro CTD Sensor Figure 3 1 Micro CTD Sensor Block Diagram All of the sensor boards including any additional sensors plug into the data logger board The data logger has a common signal bus for communicating with the sensor boards and provides individually controlled power to each of the primary sensors A microprocessor on the data logger board controls all the communications and power to the sensors collates the sensor data including supply voltage with a date time stamp stores the dat
18. 0 3 mm 1 98 in Y 297 mm 11 7 in acetal standard 500 meters T 316 Stainless steel optional 4500 meters Gr 5 titanium optional 6000 meters User Manual for AML Oceanographic s Micro CTD Sensor Weight 536 g 1 18 pounds in air for Acetal 78 g 0 17 pounds in water for Acetal 2244 g 4 94 pounds in air for stainless steel option 1786 g 3 93 pounds in water for stainless steel option 1320 g 2 90 pounds in air for titanium option 862 g 1 90 pounds in water for titanium option Environment Operating 2 to 40 C 28 to 104 F Storage 40 to 60 C 40 to 140 F Pressure Limited by pressure case or pressure sensor which ever is shallower Connectors Power Data Connectors Used on instrument and battery pack Bulkhead Connector IMPULSEtm MCBH 8 FS with 24 AWG Dummy Plug IMPULSEtm MCDC 8 MP Shorting plug IMPULSEtm MCDC 8 MP S pins 6 and 7 are shorted molded red Com Cable Connector IMPULSEtm PMCIL 8 MP pins 6 7 and 8 are shorted 2 meter cable length 22 AWG with DB 25 connector Retainer Ring IMPULSEtm DLSMC F Materials Stainless steel neoprene polyurethane acetal External Sensor Connectors Used on instrument and external sensors Bulkhead Connector IMPULSEtm IE55 1206 BCR with 24 AWG Bulkhead Dummy Plug IMPULSEtm IE55 1206 SCP Cable Dummy Plug IMPULSEtm IE55 1206 SCR Cable Connector IMPULSEtm IE55 1206 CCP Materials Titanium polyurethane User Manual for AML Oceanographic s
19. 0d85fd 0xa50ab56b 0x35b5a8fa 0x42b2986c Oxdbbbc9d6 Oxacbcf940 0x32d86ce3 0x45df5c75 Oxded60dcf Oxabd13d59 0x26d930ac 0x51de003a 0xc8d75180 Oxbfd06116 0x21b4f4b5 0x56b3c423 Oxcfba9599 Oxb8bda50f 0x2802b89e 0x5f058808 Oxc60cd9b2 Oxb10be924 0x2f6f7c87 0x58684c11 Oxc1611dab 0xb6662d3d 0x76dc4190 0x01db7106 0x98d220bc Oxefd5102a 0x71b18589 0x06b6b51f Ox9fbfe4a5 Oxe8b8d433 0x7807c9a2 0x0f00f034 0x9609a88e 0xe10e9818 Ox7f6a0dbb 0x086d3d2d 0x91646c97 0xe6635c01 Ox6b6b51f4 0x1c6c6162 0x856530d8 0xf262004e 0x6c0695ed 0x1b01a57b 0x8208fAc1 Oxf50fc457 0x65b0d9c6 0x12b7e950 Ox8bbeb8ea Oxfcb9887c 0x62dd1ddf 0x15da2d49 0x8cd37cf3 Oxfbd44c65 0x4db26158 0x3ab551ce 0xa3bc0074 Oxd4bb30e2 Ox4adfa541 0x3dd895d7 Oxa4d1c46d Oxd3d6f4fb 0x4369e96a 0x346ed9fc 0xad678846 Oxda60b8d0 0x44042d73 0x33031de5 Oxaa0a4c5f Oxdd0d7cc9 0x5005713c 0x270241aa Oxbe0b1010 0xc90c2086 0x5768b525 0x206f85b3 0xb966d409 Oxce61e4 9F OxSedef90e 0x29d9c998 0xb0d09822 0xc7d7a8b4 0x59b33d17 Ox2eb40d81 Oxb7bd5c3b OxcOba6cad Oxedb88320 Ox9abfb3b6 0x03b6e20c 0x74b1d29a 0xead54739 0x9dd277af 0x04db2615 0x73dc1683 0xe3630b12 0x94643b84 0x0d6d6a3e 0x7a6a5aa8 Oxe40ecf0b 0x9309ff9d 0x0a00ae27 0x7d079eb1 Oxf00f9344 0x8708a3d2 0x1e01f268 0x6906c2fe Oxf762575d 0x806567cb 0x196c3671 0x6e6b06e7 Oxfed41b76 0x89d32be0 Ox10da7a5a 0x67dd4acc Oxf9b9df6f Ox8ebeeff9 Ox 17b7be43 0x60b08ed5 Oxd6d6a3e8 0xald1937e
20. 32 or RS 485 communications auto or to RS 232 232 or RS 485 485 only mode It is a saved setting that becomes the default on power up Example 1 gt SET FORCE auto gt Communications is set for auto detection Example 2 gt SET FORCE 232 gt Communications is set for RS 232 mode Warning In auto detect mode if nothing is connected and ready to communicate on the non instrument end of the cable the instrument communications will default to RS 485 mode If RS 232 is the intended communications format then the instrument needs to be turned off and back on after the other communications device is powered and ready in order to auto detect RS 232 Command DISPLAY FORCE DIS F This command displays the current mode of communications as either auto detection RS 232 or RS 485 Example gt DIS FORCE 23 User Manual for AML Oceanographic s Micro CTD Sensor gt Communications is set for RS 485 mode Command SET DETECT SE DE ab Where a a Hex number between 0 F b a Hex number between 0 7 This command sets the detection mode of the instrument on power up to start up in the Auto baud mode or to set the instrument to default to a specific baud rate at power up The a value defines how many times the Micro CTD will try to determine the baud rate when the enter key is pressed before it defaults to the baud rate set by the value of b If a 0 the Micro CTD will not auto baud an
21. 55 Copyright c 2005 2006 AML Oceanographic gt Once the prompt appears the Micro CTD Sensor is ready to accept instructions Refer to the RS 232 Command Summary section 5 1 2 Caution Some versions of Hyperterminal have a bug which does not allow the properties to be changed unless the disconnect command is selected under the Call menu before changing the properties The affected programs will always show the property changes in the status bar but the changes are not actually implemented unless the program is disconnected prior to the property changes being made Select the Connect command after the changes are made 59 User Manual for AML Oceanographic s Micro CTD Sensor APPENDIX B Using PROCOMM Note B 1 B 2 To communicate with the Micro CTD Sensor a terminal emulation program such as PROCOMM can be supplied This DOS based program provides the mechanism of communication between the instrument and an IBM compatible computer This section describes the installation and use of the shareware program PROCOMM as a method of communicating with the Micro CTD Sensor PROCOMM is a shareware program It has been supplied free of charge and if it is found to be useful the user should register this software Registration information can be found in the file LICENSE DOC INSTALLING PROCOMM PROCOMM should be installed on the computer s hard disk The installation program will create a su
22. H SET R F This command while in TALK mode with the conductivity board will set the conductivity range from 0 to 9 mS cm 0 to 10 psu The sensor s fresh water calibration coefficients will be used to calculate conductivity To view the range setting after selection the DISPLAY C command can be used To exit the talk mode use the CTRL C command Example gt TALK 1 enter talk mode with the conductivity board in slot 1 Entering talk mode 1 Conductivity Micro Sensor V2 02 SN 7134 C Copyright c 2000 2004 AML Oceanographic gt gt SET R F set the conductivity range to fresh Using fresh water coefficients gt gt DIS C display both sets of conductivity coefficients Conductivity salt A 1 137264E 02 B 2 584538E 05 C 3 955218E 07 D 1 737175E 09 E 3 799872E 06 F 2 835281E 09 G 1 493990E 10 H 8 650976E 13 Threshold 500 Conductivity fresh A 1 167051E 02 B 2 837877E 06 C 3 370388E 08 D 1 163657E 10 E 3 409089E 06 F 1 322281E 09 G 1 344379E 11 H 4 273783E 14 Threshold 3470 Using fresh water coefficients gt 33 User Manual for AML Oceanographic s Micro CTD Sensor Command SET RANGE SALT SET R S This command while in TALK mode with the conductivity board will set the conductivity range from 2 to 70 mS cm 2 to 40 psu The sensor s salt water calibration coefficients will be used to calculate conductivity To view the range setting after selection the DISPLAY C command can be us
23. ML OCEANOGRAPHIC ANSA 2 your old ideas ANG Micro CTD User Manual Version 2 6 Aug 2007 User Manual for AML Oceanographic s Micro CTD Sensor TABLE OF CONTENTS TABLEBOBECONTENTS esee edebat dte dete ode ia onte uisu nada 2 1 IN TRODUCHON a A STO VE NAA 4 1 1 Te 4 12 JB DIS Eon etc fee oos o eus ea DA S ue DUIS ere Me TCU DIS SENDEN CLE x MEE 6 2 STANDARD SPECIFICATIONS sccsccsssssessessessesescesceeseeseeseaseaseaseaseaseaseeseacenseasensensenses 7 3 DESCRIPTION oa 10 3 1 Punctional DeSeripllolk a iir rtt rrr I dudas pesce 10 4 PREPARATION FOR USE sia 12 4 1 fnspecting he AO tete a 12 4 2 Connection to a COPIpDULE ciet iia does 12 4 3 Powering the Micro CTD Sensors Acdece obrera nre rod o 13 431 External POWGE aeree tert ae ee Mus enden ee rid 13 4 3 2 Micro CTD logging OPONE 13 4 332 T Micro Battery Pack sioe ete Lec 14 4 4 SoftWare SED ini 14 5 COMMUNICATIONS 5 1 0 s 15 5 1 RS 232 RS 485 via the Data Power Cable eterne tren eere 15 S l RS 232 Capadocia 15 5312 RS as Capability cutee ones nen om tenet NU ttu 16 5 2 Sii ME c Q 16 A SUMMA Falle ie earene ey tare eye pnr oa dae ane pte p uo SURE RAE US RE USA 16 52 2 ISS C M 16 5 2 3 Terminal Emulators and Custom Applications esses 17 5 3 ASCHE Communications eiie ienee epic E DECR ERE DUE RP LEE CIE HL Lbs 17 5 3 1 Standard Output Data
24. Matt ash Nata 6 3 Tro bleshootne GUIUe osse a EE DS LLL Se ET oR ee 7 MAINTENANCE a o a 7 1 General Maite ss sda cea od A e de e cata cede ede 71 2 Conductivity Sensor Maintenance oii so is iN des 1 3 Replacin the Dateries ee oe ot EE Pa D CE ETE e Caec Dai 7 3 1 Battery considerations for the Micro CTD eee 7 3 2 Recommended Battery rating for the Micro CTD esses 4 3 3 Battery CUMEMSIOUS lt 2 ooo da A dio Voltage capacity coe dece ee ce Satan ce ee ec opcs E A a a he a re a a ee el 7 3 6 Maximum current sourcing capabilities eene 8 CALIBRATION P rere ree ere ere ere 8 1 Conducir 8 2 Na AAA AO 8 3 Pressure EPOC ga a Lc Eae 8 4 Battery external y Ota get tlalpan aes LEES 8 5 COPIAS E e E 9 dl A p tee a a eee eee the re APPENDIX AS Using Hp eee et RR RR RD RE RR ERN PNE eei ERR dE AUR C Sisi H pente ae APPENDIX B Using PROCOMM tiet ite etit ARAS B mstalns PROCONINLE bottes a iat tn t oth Oe ut un te ttti HC qDungPROCOMND d dnas etd tm APPENDIX 7 Wiring DIagrant oon ite tetro bessere eve tu to tene eee eh eee abla APPENDIX D 32 Bit CRE Calculation and l able 5 tte ettet ettet APPENDIX E Quick Guide ascitis User Manual for AML Oceanographic s Micro CTD Sensor 1 1 INTRODUCTION This manual describes the AML Oceanographic Micro CTD Sensor If additional items such as sensors or software are used in conjunct
25. Micro CTD Sensor 3 DESCRIPTION 3 1 FUNCTIONAL DESCRIPTION The Micro CTD Sensor has three separate sensors refer to Figure 3 1 each of which responds to a specific property of the water environment eThe conductivity sensor used to calculate the salinity monitors the electrical conductivity of the water by passing a constant AC current through a known volume of water and measuring the resulting voltage developed across the water The higher the salt content of the water the lower the resistance will be and the lower the voltage across the sensor eThe pressure sensor responds to pressure by monitoring the stress on a silicon chip exposed to the ambient pressure The silicon chip is fabricated as a Wheatstone bridge and the differential voltage output across the bridge is a function of the stress exerted by the ambient pressure eThe temperature sensor responds to the ambient temperature by passing a very small constant current through the thermistor junction and measuring the resulting voltage developed across the junction The voltage is inversely proportional to the ambient temperature Each sensor requires an excitation signal and synchronous sampling of the sensor output voltage The conductivity and pressure sensors also incorporate thermal compensation The output voltage must be converted to a digital signal raw output and then the calibration coefficients must be applied to calculate the output in engineering units All of these
26. This command sets the state of the current loop The value must be within the maximum and minimum values specified for the loop Values entered beyond the maximum or minimum settings will be clipped to those values The equivalent current output for the data value can be calculated using the general formula below 44 User Manual for AML Oceanographic s Micro CTD Sensor Current output in mA 2 Data LoopMin q 16 current span 4 mA LoopMax LoopMin Example With loop 1 representing pressure Loopl Max 500 Loopl Min 0 gt Set loopl data 250 set the current loop data to 250 The equivalent current output would be Current output in mA 250 0 500 0 16 4 0 5 1644 12mA 5 3 3 Logging data If the Micro CTD Sensor has been configured with the Logging Option the instrument will have the capability of storing data in its non volatile memory There are two methods for logging data untethered using the external battery pack or tethered using the data power cable 5 3 3 1 Untethered Logging Untethered logging is using the instrument to collect data without requiring a cable to the surface Untethered logging requires a battery pack interconnect cable and shorting plug A typical logging sequence would be as follows eConnect the Micro CTD to a computer and power supply via the communications cable eEstablish communications with the Micro CTD using a terminal program eProgram the instrument s lo
27. a to flash memory if required and outputs the data to the external world via the communications board The communications board converts the incoming commands from and the outgoing data to the chosen external communications format The standard external format is RS 232C ASCII which is also the standard serial communications protocol for personal computers 11 User Manual for AML Oceanographic s Micro CTD Sensor 4 1 4 2 PREPARATION FOR USE INSPECTING THE INSTRUMENT At AML we do our best to package our instrumentation to avoid damage during shipping as should the user However accidents do happen so an inspection of the Micro CTD Sensor before each use will assist in spotting problems that could lead to inaccurate data or possible failure eExamine the outside of the shipping case for evidence of heavy impacts during transport elf signs of damage are visible continue with the inspection as follows and notify the carrier and the factory of any damage found eCheck that the communications and power connector is not loose and that there is no dirt or grit in the connector s eExamine the cable for cuts or wear and check the connector ends for visible damage eCheck for a cracked or chipped conductivity cell as this will change the calibration of the sensor eCheck the temperature probe for signs of damage to the capillary tube CONNECTION TO A COMPUTER The user communicates with the Micro CTD Sensor via any IBM or
28. ata cable Connect the data cable to the serial port of the computer If the Micro CTD Sensor is externally powered connect the data cable power leads to a 12 volt DC supply Launch Hyperterminal by selecting the program from the start menu under programs Under the File menu select properties the Properties window will then open Under Connect Using select direct to com 2 or the port the sensor is connected to Click on the Configure button to open the COM2 Properties window and enter the following Bits per second 38400 or the desired baud rate Data Bits 8 Parity none Stop Bits 1 Flow Control none Phone Number Settings Port Settings Country code z Data bits e Enter the area code without the lona distance prefix Area code Parity None Phone number Stop bits E Connect using Direct to Com 2 Jv Change Icon Bits per second Elow control None v Use country code and area code Advanced Restore Defaults Cancel Figure A 1 Properties Windows in Hyperterminal Select OK in the COM2 Properties window Select OK in the Properties window Hit the lt Enter gt key If all cables have been connected properly and the appropriate baud User Manual for AML Oceanographic s Micro CTD Sensor rate serial port combination chosen the instrument will respond with a header and then the prompt gt eg MC3 Version 3 04 Apr 13 07 SN 74
29. atically output one scan of data at power on If the auto baud feature has not been disabled the Micro CTD will wait for a carriage return before it outputs data See SET DETECT command Use the SET STARTUP MONITOR and SET STARTUP PROMPT commands for alternative startup options 29 User Manual for AML Oceanographic s Micro CTD Sensor Example gt SET DETECT 05 disable the auto baud and default to 9600 baud at power up gt SET STARTUP NOHEADER do not display a header at power up gt SET STARTUP SCAN On power up 09 24 07 10 15 46 30 31 869 0000 04 00 103 010 43 35 802 gt Command SET STARTUP MONITOR SE ST M This command sets the Micro CTD to automatically output scans at power on If the auto baud feature has not been disabled the Micro CTD will wait for a carriage return before it outputs data See SET DETECT command The following example sets the Micro CTD to output data at power up with a baud rate of 9600 Use the SET STARTUP SCAN and SET STARTUP PROMPT commands for alternative startup options Example gt SET DETECT 05 disable the auto baud and default to 9600 baud at power up gt SET STARTUP NOHEADER do not display a header at power up gt SET STARTUP MONITOR At power up the Micro CTD will continuously output Real data at 9600 baud Note To return to the prompt hold down the RETURN key while powering up the Micro CTD Use the SET STARTUP PROMPT command to return the Micro CTD to the prompt
30. b directory named PROCOMM on the selected drive To install PROCOMM on Drive C place the disk labelled PROCOMM in the appropriate floppy drive Log to that drive then type INSTALL C USING PROCOMM To use PROCOMM enter the following commands C CD PROCOMM PROCOMM PROCOMM comes configured with the following parameters Communications port COMI Baud rate 9600 Parity None Bits 8 Protocol None If the instrument has been connected to COMI then no changes are necessary To display the communication line setting menu type lt ALT gt P This will display the screen as shown in figure 3 1 Enter the number that corresponds to the parameter to be changed eg entering 21 RET would select COM2 The baud rate can also be changed in the same manner Any changes made should be saved to disk by entering 24 lt RET gt The parity data bits and stop bits must not be changed Press the ESC key to exit this menu and return to the communications screen 60 User Manual for AML Oceanographic s Micro CTD Sensor LINE SETTINGS CURRENT SETTINGS 2400 N 8 1 COMI 1 300 E 7 1 7 300 N 8 1 2 1200 E 7 1 8 1200 N 8 1 3 2400 E 7 1 9 2400 N 8 1 4 4800 E 7 1 10 4800 N 8 1 5 9600 E 7 1 11 9600 N 8 1 6 19200 E 7 1 12 19200 N 8 1 Parity Data Bits Stop Bits 13 ODD 16 7 bits 18 1 bit 14 MARK 17 8 bits 19 2 bits 15 SPACE 20 COMI 21 COM2 22 COM3 23 COM4 24 Save Changes YOUR CHOICE
31. battery voltage coefficients can be accessed by sending commands to the instrument Accessing the coefficients for viewing or editing all other sensor can be achieved by talking to the individual sensor boards using the TALK command The addresses of the sensor boards are as follows Sensor board slot Address Conductivity 1 Spare 2 Pressure 4 Temperature 3 Once communications is established with the individual sensor board the user can view or edit the calibration coefficients by using the DIS COEFFICIENTS or SET commands The following describes the method to edit the Calibration coefficients for each parameter of the Micro CTD using the SET command Refer to the TALK command for accessing the coefficients The calibration equations for the sensors can be found in section 8 Conductivity Command SETrn c Where r conductivity range FRESH or SAL n the coefficient letter A through H c calibration coefficient Example gt talk 1 enter talk mode with the conductivity board in slot 1 Entering talk mode 1 Conductivity Micro Sensor V2 07 SN 2408 C Copyright c 2000 2005 AML Oceanographic gt set sal a 1 098624E 02 set the salt A coefficient gt set fresh a 3 055426E 04 set the fresh A coefficient 36 User Manual for AML Oceanographic s Micro CTD Sensor gt dis c display the conductivity sensor coefficients Conductivity salt A 1 098624E 02 B 6 103991E 07 C 4 971455E 09 D 1 567713E 11 E 2 560894E 05
32. command SET SAMPLE 6 HOUR This will set the sample rate for one sample every 6 hours SE SA 30 SEC This will set the sample rate for one sample every 30 seconds SET S 5 S This will set the sample rate for 5 samples per second SE S CONTINUOUS This sets the sample rate at the maximum of 25 scans per second Note 1 Care should be exercised when setting both the SAMPLE RATE and the pressure INCREMENT For example if the Sample rate is set to 1 minute and the pressure increment is set to 1 dBar every 1 minute the instrument will check for a 1 dBar change in pressure 2 Note that fast sampling rates may be degraded by the baud rate and output formats chosen Command SET TIME SE T hh mm ss ss This command sets the real time clock in the instrument This command uses the 24 hour clock with a format of hh mm ss ss Example SET TIME 13 44 12 65 Command SET DATE SE DA mm dd yy This command sets the date using the format mm dd yy Example SET DATE 03 11 07 March 11 2007 Command SET SN SE SN nnnn This command sets the serial number of the instrument This command is intended to facilitate integration into OEM equipment To display the instrument s serial number use the VER command Example gt SET SN 7245 Note To display the serial number use the DISPLAY VERSION command Warning Changing the instruments serial number will adversely effect the operation of Smart Talk or ISS so
33. d will default to the baud rate specified by the value of b at each power up The b value defines the baud rate to be used if auto baud detection fails or if a specific baud rate is required as described in the following table b value Baud rate 600 1200 2400 4800 9600 19200 38400 57600 115200 VNVOo0O DU A nr Note There is no auto detect for baud rates above 38400 Use the SET BAUD command to set for 57600 and 115200 baud rates Example 1 gt SET DETECT 97 In the above example the Micro CTD will try 9 times to auto baud If the instrument is not able to establish a baud rate it will default to 38400 baud Example 2 gt SET DETECT 05 In the above example the Micro CTD will not try to auto baud but will simply default to 9600 baud on power up Command SET SENSOR DETECT ONCE This command sets the instrument to check for new or missing sensors only on power up 24 User Manual for AML Oceanographic s Micro CTD Sensor Command SET SENSOR DETECT ALWAYS This command sets the instrument to check for new or missing sensors every time the instrument takes a scan Command SET BAUD SE BAU value NOPROMPT The SET BAUD command is a temporary setting and is lost on power down of the instrument When the instrument is powered on again it will revert to the setting last defined by the SET DETECT command This command will set the instrument to a fixed baud rate defined by the value W
34. data Magnetic Interference The standard configuration of the Micro CTD Sensor has no magnetic sensors and is therefore immune to low frequency magnetic interference Strong nearby high frequency magnetic fields may induce noise in the electronic circuitry and thus create noise in the data readings Placing the Micro CTD Sensor near this type of interference source is not advised Radio Interference Due to the small board size of the Micro sensors they are less susceptible to radio interference than many other instruments However they are not immune Tests show the Micro CTD can withstand a 5 Watt 144 MHz RF transmitter operating 2 metres away from the instrument without any degradation in performance 48 User Manual for AML Oceanographic s Micro CTD Sensor 63 TROUBLESHOOTING GUIDE The following section outlines some of the most common problems encountered by users of the Micro CTD Sensors A brief list of suggested solutions has been provided If the difficulties persist please do not hesitate to contact the AML Oceanographic service staff Phone 250 656 0771 Fax 250 655 3655 E mail service AMLoceanographic com Mail AML Oceanographic 2071 Malaview Avenue Sidney BC Canada V8L 5X6 Problem Micro Sensor does not communicate with the computer Solutions Incorrect power is being applied to the instrument Check with a volt meter for proper supply voltage and polarity The voltage range is from 8 to 24 VDC Plea
35. defective The warranty applies only to the original purchaser of the instruments The warranty does not apply if the instrument has been damaged by accident or misuse and is void if repairs or modifications are made by other than authorized personnel This warranty is the only warranty given by AML oceanographic No warranties implied by law including but not limited to the implied warranties of merchantability and fitness for a particular purpose shall apply In no event will AML oceanographic be liable for any direct indirect consequential or incidental damages resulting from any defects or failure of performance of any instrument supplied by AML oceanographic Disclaimer AML oceanographic reserves the right to make any changes in design or specifications at any time without incurring any obligation to modify previously delivered instruments Manuals are produced for information and reference purposes and are subject to change without notice 57 APPENDIX A Using Hyperterminal A 1 To communicate with the Micro CTD Sensor the terminal emulation program Hyperterminal may be used Hyperterminal is supplied with the MS Windows 95 and later operating systems This program provides the mechanism of communication between the instrument and an IBM compatible computer This section describes the configuration of the Hyperterminal program for the Micro CTD Sensor USING HYPERTERMINAL Connect the Micro CTD Sensor to the d
36. e gt DIS SCAN Scan delay is 5 Display salinity yes Display time yes Display date yes Realtime logging enabled yes Display battery yes gt Command DISPLAY STARTUP DIS ST This command will display the current startup options Example gt DIS STARTUP Logging timeout is disabled Startup delay is 0 Header is displayed Start up in prompt mode Characters reception is enabled Command DISPLAY BATTERY DIS B This command displays the battery channel coefficients and specified battery shut down voltage The battery voltage is displayed in the scan data Example gt DIS B Battery A 2 608054E 01 B 2 499812E 02 Shut down voltage is 8 0 volts gt 22 User Manual for AML Oceanographic s Micro CTD Sensor Command DISPLAY COEFFICIENTS DIS C When the instrument is not in TALK mode the DISPLAY COEFFICIENTS command also displays the battery channel coefficients The battery voltage is displayed in the scan data Example gt DISC Battery A 2 608054E 01 B 2 4998 12E 02 Shut down voltage is 8 0 volts gt 5 3 2 3 Communications Set up Commands Command SET FORCE SE F mode Where mode 232 485 or auto auto representing auto detect Note The instrument is normally configured at the factory to operate in RS 232 only mode unless RS 485 only or auto detect operation was specified at the time of purchase This command sets the communications interface to auto detect RS 2
37. ectly with the Current Loop board refer to Sensor Board General Commands in section 5 3 2 6 The Current Loop board is normally located in slot 2 The board slot can be confirmed using the DETECT command refer to Basic Set Up Commands section in section 5 3 2 1 Once in TALK mode the following commands can be used to set up or change the minimum and maximum REAL values that are to be associated with 4mA and 20mA current output values Command SET Loop1 Max nnnnn This command sets the maximum value expected from the sensor associated with current loop 1 of the instrument Command SET Loop1 Min nnnnn This command sets the minimum value expected from the sensor associated with current loop 1 of the instrument Command SET Loop2 Max nnnnn This command sets the maximum value expected from the sensor associated with current loop 2 of the instrument Command SET Loop2 Min nnnnn This command sets the minimum value expected from the sensor associated with current loop 2 of the instrument Example gt SET Loop Max 500 set the maximum pressure to 500 dBars gt SET loop min 0 set the minimum pressure to 0 dBars gt SET Loop2 Max 1600 set the maximum sound velocity to 1600 m s gt SET loop2 min 1400 set the minimum sound velocity to 1400 m s gt Dis c display both loop settings Current Loop 1 Max 5 000000E 02 Min 0 000000E 00 Current Loop 2 Max 1 600000E 03 Min 1 400000E 03 Command SET Loop 1 or 2 Data nnnnn
38. ed To exit the talk mode use the CTRL C command Example gt TALK 1 enter talk mode with the conductivity board in slot 1 Entering talk mode 1 Conductivity Micro Sensor V2 02 SN 7134 C Copyright c 2000 2004 AML Oceanographic gt gt SET RS set the conductivity range to salt Using salt water coefficients gt gt DIS C display both sets of conductivity coefficients Conductivity salt A 1 137264E 02 B 2 584538E 05 C 3 955218E 07 D 1 737175E 09 E 3 799872E 06 F 2 83528 1E 09 G 1 493990E 10 H 8 650976E 13 Threshold 500 Conductivity fresh A 1 167051E 02 B 2 837877E 06 C 3 370388E 08 D 1 163657E 10 E 3 409089E 06 F 1 322281E 09 G 1 344379E 11 Hz 4 273783E 14 Threshold 3470 Using salt water coefficients Command SET FORMAT AB SET FOR AB This command while in TALK mode with a single sensor board such as conductivity or sound velocity will set the real output format A is the number of digits ahead of the decimal place and B is the number of digits after the decimal place To exit the talk mode use the CTRL C command After exiting talk mode use the detect command to update the formats on the logger board as well Powering down the instrument will also update the logger board Example gt TALK 1 enter talk mode with the conductivity board in slot 1 Entering talk mode 1 34 User Manual for AML Oceanographic s Micro CTD Sensor Conductivity Micro Sensor V2 07 SN 3675 C Copyright
39. efficient commands in section 5 3 2 7 Command SET FRESH THRESHOLD n This command sets the logging threshold for the raw conductivity Nc channel in fresh water mode Above this count the instrument will assume an in water condition and begin logging if it is in configured to log Refer to the conductivity coefficient commands in section 5 3 2 7 Command SET TIMEOUT n nn is time in minutes from 0 to 30 Enters logging mode after the specified time interval has passed in which the instrument has been idle Power the unit off then on to exit the logging mode A time interval of 0 will deactivate the command Refer to section 5 3 2 3 Command SET SCAN PWRON Leaves power to sensor board slots on after scanning This command is not retained when the instrument is powered down and defaults back to the SCAN PWROFF setting on power up Command SET SCAN PWROFF Turns power to sensor board slots off between scans This setting is the default on instrument power up Note that when monitoring or when logging in time out or forced command logging modes instruments are continuously powered regardless of this default setting 41 User Manual for AML Oceanographic s Micro CTD Sensor Command SET BATT SHUT x x Sets the voltage below which the instrument will shut down when in logging mode Refer to the battery coefficient commands in section 5 3 2 7 Command SET SCAN LOGGING SE SC L This command enables simultaneous lo
40. er and synchronous sampling to provide accurate and stable operation over the operating range The conductivity sensor uses a dedicated RISC microprocessor to control the sensor excitation and communicate with the data logger electronics The conductivity sensor electronics are electrically isolated for both the power and signal lines from the rest of the electronics This allows the sensor to be used in conjunction with other sensors that are electrically connected to the water without interference The temperature sensor is a precision aged thermistor within a T316 Stainless Steel capillary tube to eliminate pressure effects while still allowing fast time response The temperature sensor uses a dedicated RISC microprocessor to control the sensor excitation and communicate with the data logger electronics The pressure sensor is a semiconductor strain gauge protected by a stainless steel diaphragm Various pressure ranges from 2 to 1000 bar are available The pressure sensor is fully temperature compensated over the range of 2 to 32 C The pressure sensor uses a dedicated RISC microprocessor to control the sensor excitation and communicate with the data logger electronics The data logger and power control electronics use a RISC microprocessor running at 19 6 MHz to control the sampling and power program as well as to communicate with the sensors and communications interface board The communications interface board is normally an RS 232C board
41. fresh Using fresh water coefficients gt lt CTRL C gt exit talk mode Exiting talk mode gt Example gt talk 3 Entering talk mode 3 Pressure and Temperature Micro Sensor V2 07 SN 5942 PT Copyright c 2000 2005 AML Oceanographic gt dis c display the P amp T coefficients Pressure A 2 953012E 03 B 2 119312E 01 C 4 793926E 06 D 3 247081E 11 E 1 197257E 01 F 8 347287E 06 G 1 402603E 10 H 7 296969E 16 I 1 232459E 05 J 7 8398 10E 10 K 1 662577E 14 L 1 175001E 19 Temperature A 4 555392E 01 B 5 209653E 03 C 2 014843E 07 D 5 588565E 12 E 8 685370E 17 F 6 885006E 22 G 1 782784E 27 gt s scan the PT sensors in real mode 0000 96 23 903 gt toggle to raw mode Raw Mode gt s scan the PT sensors in raw mode 46844 05402 28906 Command CTRL C This command exits the talk mode Press the ctrl key and the c key at the same time Command DISPLAY COEFFICIENTS DIS C This command while in TALK mode displays the coefficients of the sensor board that communications is established with 32 User Manual for AML Oceanographic s Micro CTD Sensor Command VERSION V This command while in TALK mode displays the current version of the firmware board type and the serial number of the sensor board that communications is established with Example gt V MC3 Version 3 05 Jun 25 07 SN 7444 Copyright c 2005 2007 AML Oceanographic 968 5 MBytes installed Command SET RANGE FRES
42. ftware 20 User Manual for AML Oceanographic s Micro CTD Sensor Command DETECT D This command checks each slot in the motherboard to identify what is plugged in and displays the sensor board type and serial number or empty for each slot This information is required for talking to individual sensor boards as described in the section entitled SENSOR BOARD GENERAL COMMANDS Example gt DETECT Detecting Sensors 1 Micro C SN 02408 2 empty 3 Micro P amp T SN 01515 Detection complete gt 5 3 2 2 Basic Display Commands Command DISPLAY VERSION V This command displays the current version of the firmware instrument type and the serial number of the instrument Example gt DIS V Micro CTD MC3 Version 3 11 Aug 26 07 SN 7444 Copyright c 2005 2006 AML Oceanographic 128MB of Memory added only if flash memory card is available Note If flash memory card is installed but there is a problem detecting the card an error message will be displayed Command DISPLAY SAMPLE RATE DIS S This command displays the current scan rate Example gt DIS S Sample rate is 1 seconds 21 User Manual for AML Oceanographic s Micro CTD Sensor Command DISPLAY INCREMENT DIS INC This will display the current pressure increment setting in dBar Example gt DIS INC Pressure increment set to 5 Command DISPLAY SCAN DIS SC This command will display the current scan options Exampl
43. gging and real time output This setting is stored and becomes the real time default on power up If real time logging in air is desired set instrument conductivity threshold and sound velocity amp pressure increments to zero Note Logging will not occur unless the conductivity is above the logging threshhold Command SET SCAN NOLOGGING SE SC NOL This command disables simultaneous logging and real time output This setting is stored and the real time output only becomes the default real time mode on power up Command INIT This command clears the instruments memory Warning This command will erase all data in the instrument s memory Command DIRECTORY DI This command displays a list of the files in the instrument memory and the status of the memory including amount of memory space free and used and number of files Example gt DI test raw 2580 05 16 05 20 15 54 00 test2 raw 645 05 16 05 20 31 09 00 60 MBytes free 0 MBytes Used 2 File s listed gt 42 User Manual for AML Oceanographic s Micro CTD Sensor Command DUMP DU filename This command dumps the instrument s logged data from memory The data will be dumped in REAL or RAW formats according to the current setting of the instrument In battery pack amp shorting plug command LOG or TIMEOUT logging modes the logged data will be separated by a New Cast header each time logging resumes from a non l
44. gging parameters eUnplug the communications cable from the Micro CTD eConnect the Micro CTD to the Battery Pack using the interconnect cable Insert the Red Shorting plug into the Battery Pack this turns on power to the instrument eDeploy and recover the instrument eRemove the Shorting Plug to power down the instrument eConnect the Micro CTD to a computer and power supply via the communications cable Capture the logged data using SmartTalk ISS or by using the Micro CTD s DUMP command using a terminal program Note The Micro CTD Sensor will not log data into its memory unless the instrument s conductivity sensor detects that it is in salt water and power is applied via the shorting plug or data power cable Refer to the SET SALT THRESHOLD command in section 5 3 2 7 45 User Manual for AML Oceanographic s Micro CTD Sensor 5 3 3 2 Tethered Logging Tethered logging is using the instrument to collect data while the data power cable is connected Tethered logging can be done using external power via the data power cable or it can be done with the instrument connected to a battery pack that is connected to a computer via the data power cable There are three modes of tethered logging operation e Real Time Logging SET SCAN LOGGING e Command Logging LOG and e TIMEOUT Logging Refer to the commands in section 5 3 2 to enter each of these logging modes A typical TIMEOUT logging sequence would be as follows eCon
45. he data power connector the instrument can communicate via RS 232 or RS 485 at data rates from 600 to 115 2K baud The baud rate can be auto detected to bauds rates up to 38 4K baud 5 1 1 RS 232 Capability The RS 232 capability provided on the Micro CTD is defined as follows Full duplex 8 data bits 1 stop bit no parity asynchronous Standard ASCII Code 128 characters Logic 1 mark is a voltage between 5 and 25 VDC referenced to ground Logic 0 space is a voltage between 5 and 25 VDC referenced to ground Not compatible with TTL Line idles at mark Each data byte is framed by a logic O start bit and a logic 1 stop bit Baud detection on power up to baud rates of 38 4Kbaud Instrument is idle after baud detection waiting for a command Advanced user programmable settings available via AML Oceanographic s defined command and response set refer to Commands Summary section 15 User Manual for AML Oceanographic s Micro CTD Sensor 5 1 2 RS 485 Capability The RS 485 capability provided on the Micro CTD is defined as follows Half duplex differential transmission no ground reference Termination resistor characteristic impedance of the line 8 data bits 1 stop bit no parity asynchronous Standard ASCII Code 128 characters Logic 0 mark is a voltage between 0 2 and 6 VDC referenced to ground Logic 1 space is a voltage between 0 2 and 6 VDC referenced to ground Not compatib
46. here value can be 600 1200 2400 4800 9600 19200 38400 57600 and 115200 The NOPROMPT part of the command is optional If this option is not used then the SET BAUDRATE command returns a prompt indicating that the baud rate has been changed but the communications is idle awaiting a carriage return before being activated giving the user an opportunity to adjust the baud rate on the other end if required The baud rate can be changed immediately without prompt by adding the NOPROMPT option on the command line Example 1 gt SE BAU 115200 Baud rate is now set to 115200 Press Return to continue gt Example 2 gt SE BAU 9600 NOPROMPT Command SET CRC enable disable This command enables or disables the cycle redundancy check CRC checking option Note CRC must be disabled when using SmartTalk and ISS software For ease of use CRC should be disabled when using a terminal emulation program When CRC is enabled all input must be validated with a 32 bit CRC value and all strings are displayed with a 32 bit CRC at the end of the line The instrument is normally shipped from the factory with the CRC capability disabled The CRC setting is saved and used until again changed using the SET CRC command There is no default setting Example 1 gt SET CRC enable CRC mode is enabled Example 2 gt SET CRC disable081874FF Or 23 User Manual for AML Oceanographic s Micro CTD Sensor gt SET CRC disB4CECOCC CRC
47. ibration coefficient Analog channel 2 Command SET 2n c Where n coefficient letter a b c d c calibration coefficient Example gt talk 2 enter the talk mode with slot 2 the analog board Entering talk mode 2 Analog Micro Sensor V1 30 SN 0003 A gt set la 1 set the a coefficient of channel 1 gt set 2a 2 set the a coefficient of channel 2 gt dis c display the calibration coefficients Channel 1 A 1 000000E 00 B 0 000000E 00 Cz 0 000000E 00 Dz 0 000000E 00 Channel 2 A 2 000000E 00 B 0 000000E 00 C 0 000000E 00 D 0 000000E 00 Press crtl c to exit the talk mode Battery voltage Command SET BATTERY n c SET BAT n c Sets the battery voltage coefficients Where n coefficient letter a or b and c calibration coefficients for battery voltage Example gt SET BAT A 1 4352E 3 gt SET BAT B 3 75325E 1 Command SET BATT SHUT x x Sets the battery voltage level below which the instrument will shut down when in battery pack amp shorting plug untethered logging mode where x x the voltage to 1 decimal place Example gt SET BATT SHUT 8 0 39 User Manual for AML Oceanographic s Micro CTD Sensor 5 3 2 8 Logging Commands Command SET sensor INCREMENT value SE sensor INC value This command sets the logging by increment function of the instrument to a specific sensor and increment value where Sensor P Pressure Value an integer or real value with 1 decimal place Example
48. illed or fresh water Ideally the cell should be stored in distilled water to minimize wetting times Dry all electrical connections and replace the dummy connector prior to storage The electrical connector should be lubricated with 3M Silicone Spray or equivalent on a regular basis depending on use Do not grease connectors CONDUCTIVITY SENSOR MAINTENANCE The conductivity sensor must be carefully maintained to provide precise conductivity R measurements After each deployment the sensor and the Z D y entire instrument should be TN E inu Pt Electrode rinsed with fresh water Any dirt BEC Glass C Tub or other foreign material visible am e ATA inside the glass tubes can be Q Tip Ii loosened by soaking the sensor Cotton swab C Cell Stem YW Cotton tip with water alcohol and soap solution end of the instrument in warm soapy water and then flushing the sensor with fresh water The inside diameter of the glass tubes can be cleaned with a dilute soap solution soaked cotton swab Care must be taken not to touch the electrodes refer to Fig 7 1 The sensor should also be inspected for chips and cracks in the glass as these will permanently shift the sensor s calibration and could possibly lead to flooding of the pressure case If the sensor is damaged please contact the factory for instructions Figure 7 1 Conductivity Cell Cleaning 52 User Manual for AML Ocean
49. instrument Connections Externally powered instrument Connect the Micro CTD Sensor to the computer by plugging the communications cable between the Micro CTD and the RS 232 port of the computer If the Micro CTD Sensor does not have a battery pack connect the data cable wires to a DC power source 8 to 24 volts 12 volts nominal The red wire should be connected to the positive side of the supply and the black wire to the negative side of the supply If using ISS Launch ISS Configure the program for the correct port and apply the following settings 8 bits no parity 1 stop bit Select the desired baud rate Select the desired sampling rate and logging rate Select the monitor button in the toolbar ISS will then start displaying and storing data If using SmartTalk Launch SmartTalk Configure the program for the correct port and apply the following settings 8 bits no parity 1 stop bit Select the desired baud rate Select the desired sampling rate and logging rate Select the connect command Smart talk will then start displaying data To log data select the capture command SmartTalk will display a capture window Provide a file name for the data and select OK Logging will then commence To stop logging deselect the capture command If using a terminal emulation program Examples include Hyperterminal ProComm and Commo Launch a communications program Configure the program for the correct port and apply the f
50. ion with the Micro CTD Sensor the manuals for these items should also be consulted Examples of additional manuals commonly supplied are SmartTalk software manual Transmissometer sensor manual Dissolved oxygen sensor manual This manual covers the standard specifications operation use communication troubleshooting and maintenance of the Micro CTD Sensor In addition appendices at the back of the manual detail any unique configurations for the instrument Unique configurations include such things as calibration coefficients additional sensors custom communication formats and custom wiring configurations Also included in Appendix E is a quick reference guide that describes the basic operating procedures on one sheet for ease of use in the field THE INSTRUMENT Figure 1 1 The Micro CTD Sensor The standard Micro CTD Sensor is a three parameter self contained intelligent sensor The basic configuration includes the following conductivity sensor and electronics temperature sensor and electronics pressure sensor and electronics communications electronics data logger electronics waterproof pressure case connector cable User Manual for AML Oceanographic s Micro CTD Sensor The conductivity sensor is a small volume four electrode patented design which offers fast flushing times and low thermal hysteresis The signal conditioning electronics feature low thermal coefficient reference resistors ratio metric A D convert
51. ivity cell for cracks in the glass If the glass is cracked the sensor must be repaired and re calibrated Examine the sensor for deposits of dirt or marine growth within the glass Clean the glass tubes as described in the section 7 2 50 User Manual for AML Oceanographic s Micro CTD Sensor The platinum electrodes have been damaged The electrodes must be re plated and the instrument re calibrated Problem The pressure sensor readings are incorrect Solutions The pressure range of the sensor may have been exceeded The pressure sensor may require re calibration or replacement Contact the factory for support The pressure sensor is faulty Examine the stainless steel diaphragm of the pressure sensor for dents or scrapes If any are found the sensor will have to be replaced Contact the factory for support Problem The temperature sensor readings are incorrect Solutions The temperature sensor is faulty Examine the capillary tube of the temperature sensor for bends pits or cracks If any are found the sensor will have to be replaced Contact the factory for support 51 User Manual for AML Oceanographic s Micro CTD Sensor 7 1 7 2 MAINTENANCE GENERAL MAINTENANCE The Micro CTD Sensor has been designed to minimize user maintenance To keep the instrument in top condition the following maintenance is required After each deployment the Micro CTD Sensor case should be washed thoroughly with dist
52. le with TTL Each data byte is framed by a logic 0 start bit and a logic 1 stop bit Baud detection on power up to baud rates of 38 4Kbaud Instrument is idle after baud detection waiting for a command Advanced user programmable settings available via AML Oceanographic s defined command and response set refer to Commands Summary section Note To match the impedance of the instrument communications circuit a 120 ohm resistor should be soldered between the Tx and Rx pins at the computer end of the communications cable Without this resistor communications errors may occur 5 2 SOFTWARE There are a number of options for communicating with the Micro CTD For communication via the data power interface e AML Oceanographic provides two MS Windows based applications called Smart Talk and Integrated System Software ISS with the instrument that operate on an IBM compatible computer e The user also has the ability to use a terminal emulation program running on a computer or a custom application 5 2 1 SmartTalk SmartTalk is an easy to use MS Windows based program that allows the user to program the instrument view data log data to the computer s hard drive and export data for use in other programs such as MS Excel M Refer to the SmartTalk Manual for detailed instructions on the use of this program 5 2 2 ISS Integrated System Software is a comprehensive MS Windows based program that allows the user to program the i
53. lectrodes should be rinsed with a dilute non ionic soap solution This will reduce the surface tension of the water allowing the water to penetrate the porous platinum coating in addition to removing any oil film on the inside of the glass It is best to store the conductivity cell in distilled water if possible to eliminate the wetting time Prior to storing the Micro CTD the conductivity cell must be washed thoroughly in fresh water before the cell is allowed to dry This will prevent the build up of salt deposits on the electrode s platinum coating Do not locate any objects within 3 cm of the glass tubes on the conductivity cell Objects in close proximity to the glass tubes can disturb the electric field generated by the sensor and cause an error in the sensor s output Pressure Sensor Precautions Though the pressure sensor can survive pressures of 1 5 times the full scale pressure rating of the sensor a recalibration of the sensor will be required Caution the burst pressures of the sensors are as follows 0 to 200 bar full scale sensors 3000 PSI 400 to 1000 bar sensors 15000 PSI Optional Sensor Precautions DO Sensor Precautions The YSI DO sensor must be properly stored when not in use and re calibrated and maintained regularly to compensate for sensor drift Refer to the YSI sensor manual for details The DO2 sensor must not be exposed to pressures greater than 70 dbar 100 psi pH Sensor Precautions The pH sensor must be pro
54. nect the Micro CTD to a computer and power supply via the communications cable eEstablish communications with the Micro CTD using a terminal program eProgram the instrument s logging parameters including the timeout command eDo not communicate to the instrument for the prescribed timeout period the instrument will then start logging Refer to the SET TIMEOUT command in section 5 3 2 3 eTurn off power to the instrument by removing the data power cable from the instrument or battery pack to stop logging or hit key if SET BREAK ONis enabled eReconnect the data power cable eReset the timeout interval to 0 to disable the logging mode using a terminal program Capture the logged data using SmartTalk ISS or by using the Micro CTD s DUMP command Note For timeout logging the Micro CTD Sensor will not log data into its memory unless the instrument s conductivity sensor detects that it is in water threshold and communications have been idle for the timeout period 46 User Manual for AML Oceanographic s Micro CTD Sensor 6 1 6 1 1 PRECAUTIONS AND TROUBLESHOOTING GUIDE PRECAUTIONS Conductivity Cell Precautions As the conductivity cell has platinized metal electrodes refer to figure 7 1 there will be a wetting time before the cell will give accurate data If the cell has been left to dry the wetting time could be as long as one hour at atmospheric pressure To accelerate the wetting time the conductivity cell e
55. ng option it will be equipped with internal memory and an external battery pack Refer to the wiring diagram on the user s CD If the battery pack is used the instrument is connected to either connector on the battery pack with an interconnect cable The remaining connector on the battery pack is then connected to the data power cable which is connected to the computer For logging data when not connected to the computer the red shorting plug must be inserted into the battery pack to turn the power on to the instrument Power for the Micro CTD sensor is turned off if the there is no shorting plug or data power cable plugged in to the battery pack Figure 4 3 2 Micro instrument with battery pack and external sensor connected to external power 13 User Manual for AML Oceanographic s Micro CTD Sensor 4 3 2 1 Micro Battery Pack 4 4 Figure 4 3 2 1 The Battery pack The replacement batteries should be three good quality C size lithium 3 6 volt batteries Saft LSH 14 C cell 3 6 volt lithium batteries are recommended For more details on battery recommendations refer to section 7 2 Insert all three batteries into the brass housing positive end first Replace the battery cap on the brass housing Check the O ring seals The O rings should be clean have no nicks and should be lightly greased Slide the battery assembly back into the pressure case and screw down the retaining ring SOFTWARE SETUP If SmartTalk or ISS s
56. nged using the SET CRC command There is no default setting 53 ASCIT COMMUNICATIONS 5 3 1 Standard Output Data format The standard data format is for RS 232C ASCII based sensors Custom data outputs and formats are listed in appendix A The Micro CTD Sensor can output data in Raw or Real modes The mode can be changed by supplying the appropriate command Refer to section 5 3 2 for commands 5 3 1 1 Header Output When a standard Micro CTD Sensor is first powered up it monitors the communications line If a data cable is connected the instrument will monitor the signal line for a carriage return line feed i e the enter key from the external computer The instrument automatically determines the baud rate and configures itself to match The instrument then responds with the header information The header identifies the sensor type firmware version and serial number of the instrument and memory size if installed Example header gt Micro CTD MC3 Version 3 11 Aug 26 07 SN 7444 Copyright c 2005 2007 AML Oceanographic 968 5 MBytes installed 17 User Manual for AML Oceanographic s Micro CTD Sensor 5 3 1 2 Real Output Mode The Real mode outputs only the final calculations of date time and sensor readings in engineering units The output is sent as space delimited ASCII characters in the following format Date Month Day Year Time hh mm ss and hundredths of seconds conductivity in mS cm pressure in dbar temperatu
57. nstrument view log edit graph analyze export and print the data from multiple instruments Refer to the ISS manual for detailed instructions on the use of this program 16 User Manual for AML Oceanographic s Micro CTD Sensor 5 2 3 Terminal Emulators and Custom Applications Terminal emulation programs such as HyperTerminal ProComm or Commo or custom applications can be used to communicate with the Micro CTD instrument This may be necessary for diagnostic or integration purposes To support the use of either type of communication program the following information is provided in the Appendices of this manual 1 Set up for a terminal emulation program specifically HyperTerminal Appendix A 2 Setup for a terminal emulation program specifically Procomm Appendix B 3 The 32 bit CRC Calculations and Table Appendix D A cycle redundancy check CRC capability is available to improve communications integrity When CRC is enabled all input must be validated with a 32 bit CRC value and all strings are displayed with a 32 bit CRC at the end of the line The instrument is normally shipped from the factory with the CRC capability disabled It is recommended that CRC be disabled while using Terminal Emulation programs but can be a useful capability for real time integration with custom applications The CRC capability is enabled and disabled using SET CRC enable disable command The CRC setting is saved and used until again cha
58. oftware has been supplied with the instrument refer to the appropriate manual for the installation and configuration of these programs Both of these programs are supplied with Install Shield to simplify installation If a terminal emulation program such as Hyperterminal Windows 95 or Procomm DOS is to be used launch the program Select the appropriate com port to which the instrument is connected set the communications format to 8 bits no parity 1 stop bit and select a baud rate between 2400 and 38400 baud Apply power to the instrument and press the lt enter gt key The standard Micro CTD Sensor will respond with its header information Note that some units may be configured for custom outputs and may not respond with a header This header identifies the sensor type serial number and firmware version The sensor is then ready to accept commands If the sensor does not respond refer to the trouble shooting guide in section 6 3 The command summary for communicating with the instrument is given in section 5 3 2 14 User Manual for AML Oceanographic s Micro CTD Sensor 5 COMMUNICATIONS The Micro CTD is designed to be used with an IBM compatible computer running a terminal emulation program or AML Oceanographic SmartTalk or ISS software packages although it can be integrated into or used with other systems or vehicles with custom data collection applications When communicating with the instrument via the data power connector
59. ogging state These transitions occur when the instrument s power is cycled or when the defined raw conductivity threshold value of the active conductivity threshold salt or fresh is exceeded due to a change in external environmental conditions ex Air to salt water transitioning the instrument from a non logging state to a logging state In real time logging mode the data is only separated by a New Cast header when the instrument s power is cycled despite running transitions from non logging to logging states Example gt DUMP filename New Cast 07 10 07 10 15 55 74 31 910 0000 04 02 454 008 00 35 907 07 10 07 10 15 55 76 31 912 0000 04 02 455 008 00 35 909 07 10 07 10 15 55 79 31 912 0000 05 02 455 008 00 35 909 Command DELETE DEL filename This command erases the logged file identified by filename Example gt DEL filename Command DISPLAY LOG DIS L This command displays the contents of the current log file Example gt DIS L Depending on the data format mode REAL or RAW set in the instrument the data output will be in standard REAL or RAW format Command SET TIMEOUT SE TIMEO nn This command affects the logging conditions of the instrument as well Refer to section 5 3 2 3 for this command 43 User Manual for AML Oceanographic s Micro CTD Sensor 5 3 2 9 Optional Current Loop Data Output Board Commands The following SET commands require the user to enter TALK mode and communicate dir
60. ographic s Micro CTD Sensor 7 3 7 3 1 REPLACING THE BATTERIES NOTE For custom battery configurations please refer to Appendix C Figure 7 2 Battery compartment NOTE The end cap contains o rings Take care to avoid scratching or getting dirt on the o ring surfaces Wipe dry the battery pack if it is wet to avoid dripping water into the battery pack Remove the cables or shorting plug from the bulkhead connectors on the battery pack end cap Do not remove the stainless steel circlip on the battery pack Unscrew the acetal retaining ring This removes the battery assembly from the pressure case Unscrew the battery cap from the brass housing The spent batteries can be removed by tipping the assembly and allowing the batteries to slide out of the brass housing The replacement batteries should be three good quality C size lithium 3 6 volt batteries Saft LSH 14 C cell 3 6 volt lithium batteries are recommended Insert all three batteries into the brass housing positive end first Replace the battery cap on the brass housing Check the O ring seals The O rings should be clean have no nicks and should be lightly greased Slide the battery assembly back into the pressure case and screw down the retaining ring Battery considerations for the Micro CTD Care should be observed when choosing replacement lithium batteries for the Micro CTD Battery characteristics such as physical size current capacity voltage capacit
61. ollowing settings 8 bits no parity 1 stop bit Select the desired baud rate Press enter The instrument will respond with an identification header To see one scan of data type s followed by enter The instrument will respond with one scan of data in engineering units Pressure is given in dbar sound velocity is given in m s and temperature is given in C To monitor the data continuously type m followed by enter The instrument will respond with a continuous stream of data with each scan on a new line Pressure is given in dbar sound velocity is given in m s and temperature is given in C 64
62. perly stored in a buffer solution when not in use The sensor should be re calibrated and maintained regularly to compensate for sensor drift Refer to the pH sensor manual for details 47 User Manual for AML Oceanographic s Micro CTD Sensor 6 2 6 2 1 6 2 2 6 2 3 The pH sensor must not be exposed to pressures greater than 2000 dbar 2900 psi Optical and Acoustic Sensor Precautions These sensors must be kept clean and the sensing volume must be kept clear of obstructions Any objects within the sensing volume will cause errors in the sensor s output The sensing volume is shown in the sensor manual SENSOR INTERACTIONS The Micro CTD Sensor does not have any interaction between sensors in the standard configuration Since additional sensors can be added to the Micro CTD Sensor or other machinery and sensors can be located near or electrically connected to the Micro CTD Sensor care should be exercised to ensure that interference is minimized Electrical Interference All Micro sensors that are electrically coupled to the water such as conductivity DO and pH sensors are power and signal isolated to ensure there are no DC connections to the water This will eliminate the majority of electrical interference problems Some sensors such as the sound velocity sensor are AC coupled to the water to reduce low frequency electrical noise in the environment High frequency electrical noise can sometimes cause errors in the
63. re in C voltage in volts and a carriage return line feed end of scan Example scan 09 24 07 10 15 46 30 31 869 0000 04 00 103 010 43 35 802 The above example reads Date Month Day Year Time of scan 1 59 pm and 57 92 seconds Conductivity 31 869 mS cm Pressure 0 04 dbar Temperaure 0 103 C Voltage 10 43 volts Salinity 35 802 psu Note a positive sign is not displayed for positive temperatures 5 3 1 3 Raw Output Mode The Raw mode shows the outputs from the analog to digital converters for each sensor No compensation or manipulation of the data is performed in Raw mode Refer to section 8 to convert the raw data values to engineering data The raw counts for NI Nsv Nh Npt Np Nt and Nb are integers between 0 and 65535 The output is sent as space delimited ASCII characters in the following format The standard Micro CTD has the following raw output format Date Month Day Year Time hh mm ss and hundredths of seconds Nct Nc Npt Np Nt Nb and a carriage return line feed end of scan Example scan 06 29 07 10 16 16 02 084 29513 45937 03490 15555 000452 18 User Manual for AML Oceanographic s Micro CTD Sensor 5 3 2 Command Summary Most commands are in the form of standard English words Commands can be entered in upper or lower case letters followed by an ENTER The minimum letters of the command that the instrument will recognize are enclosed in brackets 5 3 2 1 Basic Set Up Command
64. ressure and Temperature Micro Sensor V2 07 SN 5942 PT Copyright c 2000 2005 AML Oceanographic gt set pa 2 953012E 03 set the pressure A coefficient gt dis c display the calibration coefficients Pressure A 2 953012E 03 B 2 119312E 01 C 4 793926E 06 D 3 247081E 11 E 1 197257E 01 F 8 347287E 06 G 1 402603E 10 H 7 296969E 16 T 1 232459E 05 J 7 839810E 10 K 1 662577E 14 L 1 175001E 19 Temperature A 4 555392E 01 B 5 209653E 03 C 2 014843E 07 D 5 588565E 12 E 8 685370E 17 F 6 885006E 22 G 1 782784E 27 gt Press ctrl c to exit the talk mode Temperature Command SET Tn c Where n coefficient letter a b c d e f g c calibration coefficient Example gt talk 3 enter talk mode with the Pressure and Temperature board Entering talk mode 3 Pressure and Temperature Micro Sensor V1 30 SN 0001 PT gt set ta 4 555392E 01 gt dis c display the calibration coefficients Pressure A 2 953012E 03 B 2 119312E 01 C 4 793926E 06 D 3 247081E 11 E 1 197257E 01 F 8 347287E 06 G 1 402603E 10 H 7 296969E 16 I 1 232459E 05 J 7 8398 10E 10 K 1 662577E 14 L 1 175001E 19 Temperature A 4 555392E 01 B 5 209653E 03 C 2 014843E 07 D 5 588565E 12 E 8 685370E 17 F 6 885006E 22 G 1 782784E 27 gt Press ctrl c to exit the talk mode Optional Analog board 38 User Manual for AML Oceanographic s Micro CTD Sensor Analog channel 1 Command SET 1n c Where n coefficient letter a b c d c cal
65. s Command RAW R This command will set the instrument to output RAW uncorrected data when using the MONITOR or SCAN commands Command REAL RE This command will set the instrument to output REAL corrected engineering data when using the MONITOR or SCAN commands Command This command is used to toggle RAW and REAL modes of operation Command SCAN S This command outputs one scan of data Command MONITOR M This command sets the instrument to output multiple scans continuously at the scan rate set by the SET SAMPLE RATE command To discontinue the monitor command the break key or the space bar can be depressed This command is not available with the binary format instruments In real time and logging mode if an error occurs when the instrument tries to open the log file the MONITOR command is terminated and the Error opening or appending to log file is displayed Note that fast sampling rates may be degraded by the baud rate and output formats chosen Command SET SAMPLE RATE SE S num units This command sets the rate at which the instrument will take samples or scans The sample rate is in the form of a number followed by the time units The allowable time units are listed below CONTINUOUS C SECONDS S SECONDS S 19 User Manual for AML Oceanographic s Micro CTD Sensor MINUTES M HOURS H The following examples demonstrate some of the possible permutations of this
66. scan delay Figure D 1 Micro CTD Power up Timing Diagram Command SET SCAN TIME SE SC T This command enables the displaying of time during a data scan Command SET SCAN NOTIME SE SC NOT This command disables the displaying of time during a data scan Command SET SCAN DATE SE SC DA This command enables the displaying the date during a data scan 27 User Manual for AML Oceanographic s Micro CTD Sensor Command SET SCAN NODATE SE SC NOD This command disables the displaying of the date during a data scan Command SET SCAN LOGGING SE SC L This command enables simultaneous logging and real time output This setting is stored and becomes the real time default on power up Command SET SCAN BATTERY SE SC BAT This command turns the battery channel on allowing it to be present in instrument output scans Current battery display status is viewable using DIS SCAN Command SET SCAN NOBATTERY SE SC NOBAT This command turns the battery channel off removing it from the instrument output scans Current battery display status is viewable using DIS SCAN Command SET SCAN NOLOGGING SE SC NOL This command disables simultaneous logging and real time output This setting is stored and the real time output only becomes the default real time mode on power up Command SET SCAN NOSALINITY SE SCN This command will disable the displaying of the salinity channel during a data scan Command SET SCAN SALINITY SE SC S
67. se refer to the appendix C Electrical Wiring Diagram The serial port chosen is incorrect Most IBM computers have only one serial port therefore the user should choose the COMI setting However if a COM2 port exists the user must take care in determining which port the cable has been connected to and choose the appropriate baud rate port combination The communications set up of the computer is incorrect The Micro Sensor will be factory set to no parity 1 stop bit 8 data bits and will automatically determine the baud rate after the reception of an Enter or Ret The baud rate of the computer was changed after the sensor was powered up Turn the power supply for the sensor off for at least 2 seconds and then back on Hit the Enter gt key The instrument should then return a header The communications cable has been inserted incorrectly Check the cable connections at the computer and the sensor Examine the pins on the sensor connector for bent or corroded pins 49 User Manual for AML Oceanographic s Micro CTD Sensor Problem The instrument communications are intermittent Solutions The communications cable has been inserted incorrectly Check the cable connections at the computer and the instrument Examine the pins on the instrument connector for bent or corroded pins The communications cable has a fault Check the continuity of the cable with an ohmmeter while flexing the cable Short cables
68. standards agencies specify semi annually for all sensors used in bathymetry work Re calibration of these sensors must be done at the factory or an authorized service facility Contact the factory for the location of the nearest facility The Micro Sensors are calibrated by recording the instrument s raw data at known reference points This data is applied to a curve fitting algorithm to produce calibration coefficients Each set of coefficients are permanently stored in the instrument s memory Calibration coefficients are not interchangeable Each set is unique to each instrument The calibration coefficients for the instrument to which this manual belongs are stored in PDF format on the accompanying USER DOCUMENTATION CD The user will need these coefficients if the instrument is to be used in the RAW mode for post processing purposes CONDUCTIVITY The conductivity sensor is calibrated against conductivity ratio The following equations are used to convert raw data to engineering units C A B Nct C Nect D Net E F Net G NcC H Nct Nc Cond C 42 914 Where C conductivity ratio Cond conductivity in mS cm Nct Nc raw values A through H are calibration coefficients determined at the factory Refer to Appendix F The Practical Salinity Scale to convert conductivity and temperature to salinity TEMPERATURE The temperature electronics use the following formula to convert raw data to engineering units C
69. the instrument can bi directionally communicate via RS 232 or RS 485 at data rates up to 115 2K 38 4k auto baud The instrument is normally configured at the factory to operate in RS 232 only mode unless RS 485 only or auto detect operation was specified at the time of purchase The setting can be changed in the field by the user The setting is saved and becomes the default on power up Note In auto detect mode if nothing is connected and ready to communicate on the non instrument end of the cable the instrument communications will default to RS 485 mode If RS 232 is the intended communications format then the instrument needs to be turned off and back on after the other communications device is powered and ready in order to auto detect RS 232 For connection to a computer AML Oceanographic normally supplies a cable with a DB9 female connector at one end that plugs into the computer s serial port and the appropriate connector for the instrument at the other end When this connection has been made and power applied the instrument is powered up and ready to communicate with the computer WARNING A plug or cable must be installed in the data power connector at all times when the instrument is immersed in water Failure to do so will cause corrosion to the connectors and may cause water damage in the electronics housing 5 1 RS 232 RS 485 VIA THE DATA POWER CABLE When communicating with the Micro CTD via t
70. unicate with individual boards through the motherboard by first requesting access using the TALK command Once communications is established with the individual sensor and or board the user can use other commands specific to the board Command TALK TA n Where n an integer 1 3 that identifies the slot number of the board to be communicated with The DETECT command described in the Basic Display Commands sections is used to identify which board is in which slot number On a standard instrument the boards are placed in the following order Sensor board slot Address Conductivity 1 Spare 2 Pressure amp Temperature 3 To exit the talk mode use the CTRL C command NOTE While in the talk mode other commands such as MONITOR VERSION and SCAN may be used Example 1 gt talk 1 enter talk mode with the conductivity board in slot 1 Entering talk mode 1 Conductivity Micro Sensor V2 07 SN 2408 C Copyright c 2000 2005 AML Oceanographic gt dis c Conductivity salt A 1 098624E 02 B 6 10399 E 07 C 4 971455E 09 D 1 567713E 11 E 2 560894E 05 F 1 422841E 09 G 1 158846E 11 H 3 654345E 14 Threshold 500 Conductivity fresh A 6 805635E 38 B 6 805635E 38 C 6 805635E 38 D 6 805635E 38 31 User Manual for AML Oceanographic s Micro CTD Sensor E 6 805635E 38 F 6 805635E 38 G 6 805635E 38 H 6 805635E 38 Threshold 2000 Using salt water coefficients gt SET R F set the conductivity range to
71. uters and is moderately computer literate with a working knowledge of computer operation and terminology The user is familiar with the operation and function of standard communications packages While it is possible to operate the Micro CTD Sensor without these qualifications some computer experience will greatly assist the user to pass through the learning curve more rapidly User Manual for AML Oceanographic s Micro CTD Sensor STANDARD SPECIFICATIONS Conductivity Patented platinized 4 electrode Range 2 70 mS cm Accuracy 0 01 mSc m Resolution 0 0015 mS cm Time constant 25 ms typically Temperature Sensor Precision aged thermistor in 316 SS housing Range 2 to 32 C Accuracy 0 005 C Resolution 0 001 C Time constant 100ms Pressure Sensor Semiconductor strain gauge Range 0 to 2 5 10 20 50 100 200 400 600 and 1000 bar Temperature range Temperature compensated from 2 to 35C Accuracy 0 05 full scale Resolution 0 1 dbar for 100 bar FS sensors 0 01dbar for 100 bar FS sensors Time constant 10 ms Optional Fresh Water Conductivity Patented platinized 4 electrode Range 0 9 mS cm Temperature range 0 to 40C Accuracy 0 01 mS cm Resolution 0 0015 mS cm Time constant 25 ms typically Optional Dual Range Conductivity Patented platinized 4 electrode Range 0 70 mS cm Temperature range 2 to 40C Accuracy 0 01 mS cm Resolution 0 0015 mS cm Time constant 25 ms typically Optional
72. y and maximum current sourcing capability should be considered The Micro CTD is shipped with lithium batteries manufactured by SAFT Internet http www saftbatteries com 53 User Manual for AML Oceanographic s Micro CTD Sensor 7 3 2 7 3 3 7 3 4 7 3 5 7 3 6 Recommended Battery rating for the Micro CTD Battery size C cell Voltage capacity 3 6v Amp hour rating 5 5Ah or better Maximum continuous current rating 800ma or better Please refer to the Battery specifications outlined in the following documentation when considering a replacement lithium battery for the Micro CTD Battery dimensions Due to the space constraints of the Micro CTD battery assembly close attention to the battery size must be observed Dimensions can very from one manufacture to another The diagram shows the recommended size of the lithium batteries for the Micro CTD Voltage capacity A nominal voltage of 3 6 volts is recommended but battery voltage will vary with temperature usually the lower the temperature the lower the voltage output by the battery Typically lithium battery voltage will remain fairly constant until they are near the end of their capacity When the voltage starts to drop off rapidly it is a good indication that the batteries need replacing very soon 25 8 mm Current Capacity The nominal current capacity of lithium batteries will be specified in Amp Hours Ah and this figure is used to indicate how long the

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