Sea-Bird Scientific MicroCat SBE 37 User Manual
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Sea-Bird Scientific MicroCat SBE 37 User Manual

Conductivity and temperature sensor
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Conductivity and temperature sensor (optional
Document No.
37 SM, SMP,
SMP-ODO
Release Date:
2023-01-05
Version:
A
Software:
Seasoft V2
SBE 37 MicroCAT
pressure and optical dissolved oxygen)
425-643-9866
seabird.com
User manual

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Summary of Contents for Sea-Bird Scientific MicroCat SBE 37

  • Page 1 User manual SBE 37 MicroCAT Conductivity and temperature sensor (optional pressure and optical dissolved oxygen) Document No. 37 SM, SMP, SMP-ODO Release Date: 2023-01-05 Version: Software: Seasoft V2 425-643-9866 seabird.com...

  • Page 3: Table Of Contents

    Table of Contents Section 1 Safety information ......................3 1.1 Hazard information........................3 1.2 Equipment labels.......................... 4 Section 2 MicroCAT quick start guide ................... 5 Section 3 Specifications ........................7 3.1 Feature summary......................... 7 3.2 Mechanical........................... 7 3.2.1 Bulkhead connector......................7 3.2.2 Dimensions..........................8 3.3 Electrical............................
  • Page 4 Table of Contents 8.8 CTD storage..........................43 8.9 Calibration..........................44 8.9.1 Conductivity........................44 8.9.2 Temperature........................44 8.9.3 Pressure..........................44 8.9.4 Optical Dissolved Oxygen....................44 8.10 Spare parts and accessories....................45 8.10.1 SBE 37 spare hardware and O-ring kit................45 Section 9 Reference: command descriptions ................

  • Page 5: Section 1 Safety Information

    Section 1 Safety information Please read this entire manual before this equipment is unpacked, set up, or operated. Pay attention to all danger, warning, and caution statements. Failure to do so could result in serious injury to the operator or damage to the equipment. D A N G E R Indicates a potentially or imminently hazardous situation which, if not avoided, will result in death or serious injury.

  • Page 6: Equipment Labels

    Safety information N O T I C E The manufacturer is not responsible for any damages due to misapplication of misuse of this product including, without limitation, direct, incidental and consequential damages, and disclaims such damages to the full extent permitted under applicable law. The user is solely responsible to identify critical application risks and install appropriate mechanisms to protect process during a possible equipment malfunction.

  • Page 7: Section 2 Microcat Quick Start Guide

    Section 2 MicroCAT quick start guide This quick start guide gives the steps necessary to make sure that the SBE 37 MicroCat sensor operates correctly and collects data before it is deployed. This quick start guide and user manual applies to SBE 37 SM, SBE 37 SMP, and SBE 37 SMP-ODO models.
  • Page 8 MicroCAT quick start guide...

  • Page 9: Section 3 Specifications

    Section 3 Specifications 3.1 Feature summary Model Hardware options Communication options (RS232 is standard) Pressure Internal Pump Optical RS485 SDI-12 Integrated batteries Dissolved Inductive Oxygen Modem 37-SM 37-SMP X or X 37-SMP-ODO X or X 37-SI 37-SIP 37-IM 37-IMP 37-IMP-ODO Abbreviation key: •...

  • Page 10: Dimensions

    Specifications 3.2.2 Dimensions 37 SM 37 SMP...

  • Page 11: Electrical

    Specifications 37 SMP-ODO 3.3 Electrical Input 9–24 VDC Current draw, operation 0.29 watts Current draw, low power 30 µA Current draw, communication 4.3 mA 3.4 Communications Memory 8 Mb Communication interface RS232 RS232 output rate user-selectable, 600–115200 baud (default 19200) Data collection rate 1 Hz 37-SM data storage...
  • Page 12 Specifications...

  • Page 13: Section 4 Overview

    Section 4 Overview 4.1 Operation The SBE 37 MicroCAT measures conductivity (C) and temperature (T). Optional equipment includes: • Pressure (depth, D) • Internal pump • Optical Dissolved Oxygen (ODO) The sensor can operate as a standalone or is easily integrated with other platforms. The optional internal pump operates for one second each time the sensor collects a sample.

  • Page 14: Sample Times

    Overview 1. Cable installed—the sensor is controlled remotely and transmits data on command. The sensor can also operate autonomously and transmit data at a user-set interval. Data can be transmitted while the sensor is deployed. 2. Dummy plug installed—the interval at which data is collected is set by the user before deployment.

  • Page 15: Cable Length And External Power

    Overview Example: A 37-SMP with pressure sensor is set up to take a sample every 5 minutes, or 12 samples/hour. Data is not transmitted in real-time. How long can it be deployed? Sample time = 2.6 seconds Current draw for data collection = 0.0079 A × 2.6 seconds = 0.021 A-seconds/sample 12 ×...
  • Page 16 Overview Table 4 Common wire resistances Gauge Ohms/ft. 0.0016 0.0025 0.0040 0.0064 0.0081 0.0107 0.0162 0.0410 0.0653 Supply sufficient power to MicroCAT The power requirement depends on whether any power is supplied from the internal batteries: • Supply a minimum of 16 V, after IR loss, so the MicroCAT does not get any power from the internal batteries.

  • Page 17: Section 5 Set Up Sensor And Verify Operation

    Section 5 Set up sensor and verify operation C A U T I O N AF24173 anti-fouling devices contain bis(tributyltin) oxide. Wear rubber or latex gloves and eye protection to replace these devices on the sensor if it is so equipped. Wash hands with soap and water when finished.

  • Page 18: Install Batteries

    Set up sensor and verify operation 5.2 Install batteries W A R N I N G Explosion hazard. If the batteries are not installed correctly, explosive gases can be released. Make sure that the batteries are of the same approved chemical type and are inserted in the correct orientation.
  • Page 19 Set up sensor and verify operation Table 5 Recommended lithium battery brands SAFT LS-14500 (included) 3.6 V, 2.6 Ah Tadiran TL-4903 3.6 V, 2.4 Ah Electrochem BCX85 series 3.9 V, 2.0 Ah 1. Make sure that the end flange and pressure housing are dry. 2.

  • Page 20: Install Software And Test Sensor

    Set up sensor and verify operation 17. Align the "D"-shaped part of the battery pack with the pins on the shaft. 18. Slowly move the assembly onto the housing. Push gently to connect the battery assembly with the circuit board in the pressure housing. 19.

  • Page 21: Software Menu Items

    Set up sensor and verify operation 5. Double-click on SeatermV2.exe to start the launcher. If this is the first time the software is opened, a Serial Port Configuration window opens. The software automatically connects at the default baud rate but will try others if necessary. The software automatically looks for the serial port number of the connected sensor.

  • Page 22: Set Up Pump

    Set up sensor and verify operation 4. If there is still no communication, check the cable and connections with the sensor and the PC. 5. If there is still no communication, do step 1 with a different COM port or different fixed ID and try to connect again.
  • Page 23 Set up sensor and verify operation tau = OxTau20 × ft × fp (minimum tau is 2.0; maximum tau is 30.0) pump time = OxNTau × tau (minimum pump time = 3.0) where A = 2.549 B = -1.106 × 10 C = 1.571 ×...
  • Page 24 Set up sensor and verify operation...

  • Page 25: Section 6 Deployment And Recovery

    Section 6 Deployment and recovery W A R N I N G If the user thinks that a sensor has water in the pressure housing: Disconnect the sensor from any power supply. Put on safety glasses and make sure that the sensor is pointed away from the body and other people.
  • Page 26 Deployment and recovery The amount of air in the water column can have an effect on pump operation: • The top ±2 m of the water column may have a continuous supply of bubbles from breaking waves. It is important to be able to continuously remove air from the system. •...

  • Page 27: Data Collection Modes

    Deployment and recovery 10. Make sure all stored data has been transmitted to a PC. Send InitLogging to clear the memory. If this command is not sent, data will be stored after the last collected sample. 11. Set the date and time with DateTime. 12.

  • Page 28: Polled (Controlled) Mode

    Deployment and recovery Autonomous, continuous operation—AutoRun=N. Set up to collect data every 20 seconds. Store data in memory. Transmit data in converted decimal format, send date and time with data. Send power-off command. Select Connect in the Seaterm232 Communications menu to connect to and start sensor. SAMPLEMODE=2 Enter SAMPLEINTERVAL=20...

  • Page 29: Serial Line Sync Mode

    Deployment and recovery Supply power to the sensor. Set up to wait for a command each time it goes into standby mode. Send data in converted decimal format. Send date and time and salinity with data, then send power-off command. Keep power supplied to sensor. Select Connect from the Seaterm232 Communications menu to connect to and start sensor.

  • Page 30: Default Output Format

    Deployment and recovery Serial line sync—AutoRun=Y. Set up to collect one sample when commanded. Store data in memory. Transmit data in converted decimal format, send date and time with data. Remove power. Supply power to put the sensor in standby mode. SAMPLEMODE=2 Enter STOREDATA=Y...

  • Page 31: Other Data Formats

    Deployment and recovery Output format, SM-RS232 tt.tttt, c, p.ppp, sss.ssss, vvvv.vvv, x, dd mmm yyyy, hh:mm:ss, n temperature, conductivity (S/m), pressure, salinity, sound velocity, specific conductivity, date, time, sample number Example output: 24.2724, 0.15269, 9.316, 0.57981, 1491.560, 0.57981, 20 Oct 2016, 09:01:34,3 Output format, SMP-RS232 tttt.tttt, ccc.ccccc, ppppp.ppp, ssss.ssss, vvvvv.vvv, ccc.ccccc, dd mmm yyyy, hh:mm:ss temperature, conductivity (S/m), pressure, salinity, sound velocity, specific conductivity (S/m), date, time...

  • Page 32: Alternate Output Format

    Deployment and recovery c.ccccc if SetCondUnits=0. Units in S/m. cc.cccc if SetCondUnits=1. Units in mS/cm. ccccc.c if SetCondUnits=2. Units in µS/cm. p.ppp pressure, sent if installed on sensor andOutputPress=Y, Units in SetPressUnits=, in dbar or psi. Number of digits left of decimal is a function of pressure sensor range. s.ssss salinity, sent if OutputSal=Y.

  • Page 33: Sdi-12 Output Format

    Deployment and recovery Example: Sensor transmits data in real-time in autonomous mode. Pressure sensor installed. OutputFormat=1, OutputTemp=Y, SetTempUnits=0, SetCondUnits=0, SetPressUnits=0, SetPressUnits=0. temperature, conductivity, pressure, date, time Example output: 23.1258, 0.97795,... 14 Jul 2016, 09:01:34 6.2.1.3 SDI-12 output format OutputFormat=3 is converted decimal data in SDI-12 format. Used with SBE 37-SMP and 37-SMP-ODO sensors.

  • Page 34: Transmit Real-Time Data

    Deployment and recovery • ttttt=temperature, A/D counts • ccccc.ccc=conductivity frequency, Hz • ppppp=pressure sensor pressure, sent if pressure sensor is installed. Units in A/D counts. • vvvv=presure sensor pressure temperature compensation, sent if pressure sensor is installed. Units in A/D counts. •...

  • Page 35: Recover Sensor From Deployment

    Deployment and recovery 6.4 Recover sensor from deployment D A N G E R If the system stops while under water or shows other signs of damage, it may be flooded. The end flange may be ejected from the pressure housing with lethal force. Upon recovery, carefully secure it away from people, and slowly loosen the end flange (½...
  • Page 36 Deployment and recovery...

  • Page 37: Section 7 Transmit And Convert Data

    Section 7 Transmit and convert data Data that is collected and stored by sensors must be transmitted to a PC to process the data into a human-readable format. 7.1 Transmit data to PC Data can be transmitted during deployment or after the sensor is recovered from a deployment.

  • Page 38: Convert Data

    Transmit and convert data d. To change the location of the data file(s), push Browse. 9. Optional: select the Header Form tab. 10. If necessary, select "Prompt for Header Information" at "Header Choice." 11. Enter up to 12 lines of header information that will identify the transmitted data. Examples include mooring description, latitude/longitude, deployment start date, deployment end date.
  • Page 39 Transmit and convert data 4. Select Conductivity, Temperature, Pressure (optional), Oxygen, and other derived variables such as Salinity, Density, Sound Velocity, etc. Push OK. 5. Push Start Process in the Data Setup tab. The software converts the .hex file to a .cnv file.
  • Page 40 Transmit and convert data...

  • Page 41: Section 8 Maintenance

    Section 8 Maintenance W A R N I N G If the user thinks that a sensor has water in the pressure housing: Disconnect the sensor from any power supply. Put on safety glasses and make sure that the sensor is pointed away from the body and other people.

  • Page 42: Clean Flow Path

    Maintenance 3. Remove the protective plug from the anti-fouling device cup. 4. Use a toothpick to lift each of the anti-fouling devices out of the holder. If necessary, use needle-nose pliers to carefully break up the device. Option Procedure To deploy Insert new anti-fouling devices into the cup, then install the cap onto the sensor cup.

  • Page 43: Maintain Pump

    Maintenance used. Do not expose the pH sensor to air for longer than a few minutes. Refer to "Prepare pH sensor for storage" for details to remove the pH sensor. 2. Put the instrument in a container with the bulkhead connector face-up. 3.

  • Page 44: Examine O-Rings

    Maintenance 8.6 Examine O-rings N O T I C E Do not use petroleum-based lubricants on O-rings. It will cause damage to the O-rings. Damaged O-rings can cause the sensor to flood and make it unserviceable. Examine the O-rings on the sensor every time they are exposed—on the connector end flange and other parts.

  • Page 45: Ctd Storage

    Maintenance Separation of the rubber from the pins. Swelled or bulging rubber pins. 6. Use a silicone-based lubricant on each of the contacts of the bulkhead connector. The manufacturer recommends any of the products listed below. ™ • Spray Silicone Lubricant (3M ID# 62-4678-4930-3). Make sure to let it dry. ®...

  • Page 46: Calibration

    Maintenance 8.9 Calibration The manufacturer calibrates every sensor to known conditions and measures the response of the sensor. Calibration coefficients are calculated and are used to get engineering units. 8.9.1 Conductivity The conductivity sensor has a fixed resistor in parallel with the cell. When the cell is dry and in air, the output of the sensor is a frequency that is a reflection of the fixed resistor.

  • Page 47: Spare Parts And Accessories

    Maintenance the ODO for calibration when the memory in the main sensor is full, approximately 300,000–500,000 samples. 8.10 Spare parts and accessories Part number Description 801542 AF24173 Anti-fouling device pair 50441 Lithium batteries, 3.6 V AA cells, SAFT LS 14500 801863 Yellow cap battery holder, 14 V nominal, for use with pumped SBE 37 models 50087.1...
  • Page 48 Maintenance 60080 Stainless steel hardware kit • 31749, hex wrench, 7/64" long arm, for battery pack • 31516, hex wrench, 9/64" long arm, for battery end cap and guide • 31020, screw, 4-40 x 1", flat head, stainless steel, to attach guide to modem end flange (2) 60079 Titanium hardware kit •...

  • Page 49: Section 9 Reference: Command Descriptions

    Section 9 Reference: command descriptions This is a reference for advanced users. The values of these commands are stored in the sensor until the user changes them. Notes about terminal commands are listed below. • Commands are not case-sensitive. Push Enter to store a command. •...
  • Page 50 Reference: command descriptions <PumpOnTime>0.0</PumpOnTime> calculated from adaptive pump control, SMP model only </ConfigurationData> Example for 37-SMP ODO, user entries in boldface: GETCD <ConfigurationData DeviceType='SBE37SMP-ODO-RS232' SerialNumber='03712345'> <PressureInstalled>yes</PressureInstalled> (installed by manufacturer) OutputFormat= <SampleDataFormat>converted engineering</SampleDataFormat> SetTempUnits= <TemperatureUnits>Celsius</TemperatureUnits> SetCondUnits= <ConductivityUnits>S/m</ConductivityUnits> SetPressUnits= <PressureUnits>Decibar</PressureUnits> SetOxUnits= <OxygenUnits>ml/L</OxygenUnits> OutputTemp= <OutputTemperature>yes</OutputTemperature>...
  • Page 51 Reference: command descriptions GetEC Show event counter. Some events include: WDT reset: unexpected reset PON reset: power turned on ErrorADC12TimeOut: response delayed from A/D converter that measures main power and backup lithium cell power ErrorUART0TimeOut: timeout for transmitter to complete transmission of previous character ErrorAD7714TimeOut: response delayed from temperature and pressure A/D converter ErrorInvWakeUpFlag: unexpected wakeup ErrorFLASHTimeOut: problem with data sent to flash memory...

  • Page 52: General Setup

    Reference: command descriptions OutputSV= sound velocity OutputSC= sound velocity output UseSCDefault=, SetSCA= specific conductivity temperature coefficient TxSampleNum= transmit sample number with real-time autonomous data and polled from memory TxRealTime= transmit autonomous and serial line sync data in real-time SyncMode= serial sync mode state ReferencePressure= reference pressure to use in calculations if no pressure sensor is installed.

  • Page 53: Pump Setup

    Reference: command descriptions • TxRealTime does not affect data stored in memory, but the current draw and sample time increase slightly. • Before data collection—to save real-time data to a file, select the Capture menu, then enter your selection of file name. The capture status shows in the status bar at the bottom of the window.

  • Page 54: Output Format Setup

    Reference: command descriptions 1. Set SampleNumber=x, where x is your estimate of the number of samples in memory. 2. Upload data. If x is more than the number of samples in memory, data for the non-existent samples will be bad, random data. Look at the transmitted data file carefully and erase any bad data.

  • Page 55: Polled Data Collection, Model Without Pump

    Reference: command descriptions StartLater Start data collection at a set time in the future Stop Stop data collection or stop countdown for StartLater. Send Stop before data is transmitted to a PC. Send twice. Notes • If the battery voltage is less than 7.1 V for 10 consecutive samples, the sensor stops data collection and sets status to "low battery."...

  • Page 56: Serial Line Synchronization

    Reference: command descriptions TPSN:x Pump operates continuously, collect x data samples, show data. To stop, push Esc. MicroCAT ignores this command if StartNow or StartLater has been sent. Pump does not operate. The DO sensor collects a sample, shows data in the format specified by SetFormat= in SBE 63.
  • Page 57 Reference: command descriptions TA2=F F=temperature A2 TA3=F F=temperature A3 Conductivity CCalDate=S S=conductivity calibration date CG=F F=conductivity G CH=F F=conductivity H CI=F F=conductivity I CJ=F F=conductivity J WBOTC=F F=conductivity wbotc CTCor=F F=conductivity ctcor CPCor=F F=conductivity cpcor Pressure PCalDate=S S=pressure calibration date PA0=F F=pressure A0 iPA1=F...

  • Page 58: Odo Setup

    Reference: command descriptions OxTA2=F F= oxygen TA2 coefficient OxTA3=F F= oxygen TA3 coefficient OxE=F F= oxygen E coefficient Notes: • The coefficients stored in the SBE 63 are used to transmit converted oxygen data in response to the Send63= command. Refer to the SBE 63 manual for those commands.

  • Page 59: Sdi-12 Commands And Output

    Reference: command descriptions #iiOxA1=F F= oxygen A1 #iiOxA2=F F= oxygen A2 #iiOxB0=F F= oxygen B0 #iiOxB1=F F= oxygen B1 #iiOxC0=F F= oxygen C0 #iiOxC1=F F= oxygen C1 #iiOxC2=F F= oxygen C2 #iiOxTA0=F F= oxygen TA0 #iiOxTA1=F F= oxygen TA1 #iiOxTA2=F F= oxygen TA2 #iiOxTA3=F F= oxygen TA3...

  • Page 60: Measurement Commands

    Reference: command descriptions Break Response None; start search for valid mark Function 12 ms space on the line: put all connected sensors into standby mode (! and <CR><LF> do not apply) Acknowledge Active = a! Response a<CR><LF> Purpose verifies communication with sensor Send identification = aI! Response allccccccccmmmmmmvvvnnnnnoooooooo<CR><LF>...
  • Page 61 Reference: command descriptions atttnn<CR><LF> then start concurrent measurement a<CR><LF> aCC! start concurrent measurement and request CRC values available after seconds Send TPS = operate the pump, take a measurement, store the data in the buffer until the next sample. Command Response Function aM1!

  • Page 62: Sdi-12 Extended Commands

    Reference: command descriptions Notes aD0! after aC! 75 characters are permitted. There is space in the 75-character field for 12 values. The recorder needs to send an aD1! command to get the rest of the values. Sample of data output from an aC! command 0C!004416<CR><LF>...
  • Page 63 Reference: command descriptions aXUPx! Response ax<CR><LF> Purpose Send SetPressUnits=x. x=0 for pressure in decibars x=1 for psi aXUOx! Response ax<CR><LF> Purpose Send SetOxUnits=x. x=0 for oxygen in ml/L x=1 for mg/L aXOxxxxxxxx! Response axxxxxxxx<CR><LF> Purpose Send SetOxUnits=x. x=0 disable output x= 1 enable output Example a11111000 (enable T, C, P, O, salinity, disable sound velocity, specific conductivity, TXSampleNumber)
  • Page 64 Reference: command descriptions...

  • Page 65: Section 10 Troubleshooting

    Section 10 Troubleshooting 10.1 No communications with sensor If the OutputExecutedTag=N, the S> prompt shows that there was communication between the sensor and PC. Select Connect in the Communications menu again, or push Enter several times. Cause: The I/O cable is not connected correctly. Solution: make sure the cable is connected at the PC and the sensor.
  • Page 66 Troubleshooting differences in response times for temperature and conductivity measurements can be corrected for post-processing if the response times are known. In moored applications, the pump flushes the conductivity cell faster than the environment changes, so temperature and conductivity measurements stay aligned. Typical causes of salinity spikes include: •...

  • Page 67: Section 11 General Information

    Section 11 General information W A R N I N G This product can expose the user to chemicals with silica, crystalline (airborne particles of respirable size), which is known to the State of California to cause cancer and birth defects or other reproductive harm.

  • Page 68: Af24173 Anti-Foulant Device

    General information Batteries that are shipped without the sensor are Dangerous Goods. They can only be shipped by personnel with the appropriate training from an organization that has a Dangerous Goods program. Sensor, no spares Sensor, 1 or 2 spare cell sets Cells only UN # 3091...
  • Page 69 General information FOR USE ONLY WITH SEA-BIRD ELECTRONICS' CONDUCTIVITY SENSORS TO CONTROL THE GROWTH OF AQUATIC ORGANISMS WITHIN ELECTRONIC CONDUCTIVITY SENSORS. ACTIVE INGREDIENT: Bis(tributyltin) oxide ..52.1% OTHER INGREDIENTS: ....47.9% TOTAL .

  • Page 70: China Rohs Disclosure Table

    General information ENVIRONMENTAL HAZARDS Do not discharge effluent containing this product into lakes, streams, ponds, estuaries, oceans, or other waters unless in accordance with the requirements of a National Pollutant Discharge Elimination System (NPDES) permit and the permitting authority has been notified in writing prior to discharge.
  • Page 72 Sea-Bird Electronics 13431 NE 20th Street Bellevue WA 98005 U.S.A. (425) 643-9866 © Sea-Bird Electronics, Inc., 2022. All rights reserved. Printed in USA. SMP, SMP-ODO*...

This manual is also suitable for:

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