SBE 37-SM MicroCAT
Conductivity and Temperature Recorder
with RS-232 Interface
Shown with standard titanium housing;
optional ShallowCAT plastic housing available
User’s Manual
Sea-Bird Electronics, Inc.
1808 136th Place NE
Bellevue, Washington 98005 USA
Telephone: 425/643-9866
Fax: 425/643-9954
E-mail: seabird@seabird.com
Website: www.seabird.com
Manual Version #026, 06/14/07
Firmware Version 2.6b and later
Limited Liability Statement
Extreme care should be exercised when using or servicing this equipment. It should be used or serviced
only by personnel with knowledge of and training in the use and maintenance of oceanographic
electronic equipment.
SEA-BIRD ELECTRONICS, INC. disclaims all product liability risks arising from the use or servicing
of this system. SEA-BIRD ELECTRONICS, INC. has no way of controlling the use of this equipment
or of choosing the personnel to operate it, and therefore cannot take steps to comply with laws
pertaining to product liability, including laws which impose a duty to warn the user of any dangers
involved in operating this equipment. Therefore, acceptance of this system by the customer shall be
conclusively deemed to include a covenant by the customer to defend, indemnify, and hold SEA-BIRD
ELECTRONICS, INC. harmless from all product liability claims arising from the use or servicing of
this system.
2
Table of Contents
Table of Contents
Section 1: Introduction ........................................................................ 5
About this Manual .............................................................................................5
How to Contact Sea-Bird ...................................................................................5
Quick Start .........................................................................................................5
Unpacking MicroCAT .......................................................................................6
Shipping Precautions .........................................................................................7
Section 2: Description of MicroCAT .................................................. 8
System Description ............................................................................................8
Specifications...................................................................................................10
Dimensions and End Cap Connector ...............................................................11
Sample Timing.................................................................................................12
Battery Endurance............................................................................................13
External Power (optional) ................................................................................13
Cable Length and Optional External Power .............................................14
Section 3: Preparing MicroCAT for Deployment ........................... 15
Battery Installation...........................................................................................15
Software Installation ........................................................................................17
Power and Communications Test ....................................................................17
Test Setup .................................................................................................17
Test ...........................................................................................................18
Section 4: Deploying and Operating MicroCAT............................. 22
Sampling Modes ..............................................................................................22
Polled Sampling........................................................................................22
Autonomous Sampling (Logging commands) ..........................................23
Serial Line Synchronization (Serial Line Sync)........................................24
Real-Time Data Acquisition ............................................................................25
Timeout Description ........................................................................................26
Command Descriptions....................................................................................26
Data Output Formats........................................................................................34
Setup for Deployment ......................................................................................35
Deployment......................................................................................................36
Recovery ..........................................................................................................37
Physical Handling.....................................................................................37
Uploading Data.........................................................................................38
Section 5: Routine Maintenance and Calibration ........................... 42
Corrosion Precautions......................................................................................42
Connector Mating and Maintenance ................................................................42
Conductivity Cell Maintenance .......................................................................43
Pressure Sensor (optional) Maintenance..........................................................43
Handling Instructions for Plastic ShallowCAT Option ....................................44
Replacing Batteries ..........................................................................................45
Replacing Anti-Foulant Devices (SBE 37-SI, SM, IM)...................................46
Sensor Calibration............................................................................................47
Section 6: Troubleshooting................................................................ 49
Problem 1: Unable to Communicate with MicroCAT .....................................49
Problem 2: No Data Recorded .........................................................................49
Problem 3: Unreasonable T, C, or P Data........................................................49
Problem 4: Salinity Spikes...............................................................................50
Glossary .............................................................................................. 51
3
Table of Contents
Appendix I: Functional Description................................................. 52
Sensors.............................................................................................................52
Sensor Interface ...............................................................................................52
Real-Time Clock..............................................................................................52
Appendix II: Electronics Disassembly/Reassembly ........................ 53
Appendix III: Command Summary ................................................. 54
Appendix IV: AF24173 Anti-Foulant Device .................................. 57
Appendix V: Replacement Parts ...................................................... 61
Index.................................................................................................... 63
4
Section 1: Introduction
Section 1: Introduction
This section includes contact information, Quick Start procedure, photos of a
standard MicroCAT shipment, and shipping precautions.
About this Manual
This manual is to be used with the SBE 37-SM MicroCAT Conductivity and
Temperature Recorder (pressure optional) with RS-232 interface.
It is organized to guide the user from installation through operation and data
collection. We’ve included detailed specifications, command descriptions,
maintenance and calibration information, and helpful notes throughout
the manual.
Sea-Bird welcomes suggestions for new features and enhancements of our
products and/or documentation. Please e-mail any comments or suggestions to
seabird@seabird.com.
How to Contact Sea-Bird
Sea-Bird Electronics, Inc.
1808 136th Place Northeast
Bellevue, Washington 98005 USA
Telephone: 425-643-9866
E-mail:
seabird@seabird.com
Fax:
425-643-9954
Website: http://www.seabird.com
Business hours:
Monday-Friday, 0800 to 1700 Pacific Standard Time
(1600 to 0100 Universal Time)
Except from April to October, when we are on ‘summer time’
(1500 to 0000 Universal Time)
Quick Start
Follow these steps to get a Quick Start using the MicroCAT.
The manual provides step-by-step details for performing each task:
1.
Install batteries and test power and communications (Section 3: Preparing
MicroCAT for Deployment).
2.
Deploy the MicroCAT (Section 4: Deploying and Operating MicroCAT):
A. Install new batteries if necessary.
B. Ensure all data has been uploaded, and then set SampleNum=0 to
make entire memory available for recording if desired.
C. Set date and then time.
D. Establish setup and logging parameters.
E. Set MicroCAT to start logging now or in the future.
F. Remove protective plugs from anti-foulant device cups, and verify
AF24173 Anti-Foulant Devices are installed. Leave protective plugs
off for deployment.
G. Install dummy plug or cable connector, and locking sleeve.
H. Deploy MicroCAT, using Sea-Bird or customer-supplied hardware.
5
Section 1: Introduction
Unpacking MicroCAT
Shown below is a typical MicroCAT shipment.
SBE 37-SM MicroCAT
Batteries
25-pin to 9-pin adapter
(for use with computer
with DB-25 connector)
I/O Cable
Spare hardware
and o-ring kit
MicroCAT User Manual
6
Cell cleaning solution
(Triton-X)
Software, and Electronic Copies of
Software Manuals and User Manual
Section 1: Introduction
Shipping Precautions
Batteries packed in
heat-sealed plastic;
Sea-Bird then places
batteries in bubblewrap outer sleeve and
strong packaging for
shipment
WARNING!
Do not ship
assembled battery
pack by commercial
aircraft.
The MicroCAT was shipped from the factory with the batteries packaged
separately within the shipping box (not inside the MicroCAT). When
packaged in the manner shown and described at left, the batteries are not
considered Dangerous/Hazardous Goods, and may be shipped via commercial
aircraft (those governed by DOT or IATA, including passenger airlines, or
cargo carriers such as FedEx, DHL, UPS, etc.) if no more than the number of
batteries required to operate the instrument are included in the shipment
(i.e., no spares are included).
IMPORTANT NOTE:
Do not ship the assembled battery pack by commercial aircraft. Refer to
Lithium Battery Shipping Guidelines for background information on the
applicable regulations as well as Sea-Bird’s interpretation of those regulations,
how they apply to the batteries in our equipment, and how we package and
label our equipment.
Assembled
battery pack
Before attempting to communicate with the MicroCAT, the batteries
must be installed following the instructions in Section 3: Preparing MicroCAT
for Deployment.
Note:
All setup information is preserved in
EEPROM when the batteries
are removed.
Note:
Batteries must be removed before
returning the instrument to
Sea-Bird. Do not return used
batteries to Sea-Bird when shipping
the MicroCAT for repair.
If you will re-ship the MicroCAT by commercial aircraft after you have
finished testing:
1.
Remove the battery pack assembly from the MicroCAT.
2.
Remove the batteries from the battery pack assembly.
3.
Pack the batteries separately as described in Lithium Battery Shipping
Guidelines.
7
Section 2: Description of MicroCAT
Section 2: Description of MicroCAT
This section describes the functions and features of the
SBE 37-SM MicroCAT, including specifications, dimensions, end cap
connectors, sample timing, battery endurance, and optional external power.
System Description
The SBE 37-SM MicroCAT is a high-accuracy conductivity and temperature
recorder (pressure optional) with internal battery and non-volatile memory,
and a standard RS-232 serial interface. Designed for moorings and other longduration, fixed-site deployments, MicroCATs have non-corroding titanium
housings rated for operation to 7000 meters (23,000 feet) or pressure sensor
full-scale range. An optional plastic ShallowCAT housing rated for 250 meters
(820 feet) is also available.
Communication with the MicroCAT is over an internal, 3-wire, RS-232C
link. Over 50 different commands can be sent to the MicroCAT to provide
status display, data acquisition setup, data retrieval, and diagnostic tests.
User-selectable operating modes include:
Standard
titanium
housing
Optional
plastic
ShalowCAT
housing
•
Autonomous sampling – At pre-programmed intervals, the MicroCAT
wakes up, samples, stores data in its FLASH memory, and goes to sleep.
If desired, real-time data can also be transmitted.
•
Polled sampling – On command, the MicroCAT takes one sample and
transmits the data. Polled sampling is useful for integrating the MicroCAT
with satellite, radio, or wire telemetry equipment.
•
Serial line sync – In response to a pulse on the serial line, the MicroCAT
wakes up, samples, transmits real-time data, and goes to sleep. This
provides an easy method for synchronizing MicroCAT sampling with
other instruments such as Acoustic Doppler Current Profilers (ADCPs) or
current meters, without drawing on their battery or memory resources.
The MicroCAT can be deployed in two ways:
•
Cable installed – The MicroCAT can be remotely controlled, allowing for
polled sampling or serial line sync, or for periodic requests of data from
the MicroCAT memory. If desired, data can be periodically uploaded
while the MicroCAT remains deployed.
•
Dummy plug installed – The MicroCAT cannot be remotely controlled.
Autonomous sampling is programmed before deployment, and data is
uploaded after recovery.
Calibration coefficients stored in EEPROM allow the MicroCAT to transmit
data in engineering units. The MicroCAT retains the temperature and
conductivity sensors used in the SBE 16 SEACAT C-T Recorder, but has
improved acquisition electronics that increase accuracy and resolution, and
lower power consumption. The MicroCAT’s aged and pressure-protected
thermistor has a long history of exceptional accuracy and stability (typical drift
is less than 0.002 °C per year). Electrical isolation of the conductivity
electronics eliminates any possibility of ground-loop noise.
8
Section 2: Description of MicroCAT
The MicroCAT’s internal-field conductivity cell is immune to proximity errors
and unaffected by external fouling. A plastic cup with threaded cover at each
end of the cell retains the expendable AF24173 Anti-Foulant Device.
The MicroCAT’s optional pressure sensor, developed by Druck, Inc., has a
superior new design that is entirely different from conventional ‘silicon’ types
in which the deflection of a metallic diaphragm is detected by epoxy-bonded
silicon strain gauges. The Druck sensor employs a micro-machined silicon
diaphragm into which the strain elements are implanted using semiconductor
fabrication techniques. Unlike metal diaphragms, silicon’s crystal structure is
perfectly elastic, so the sensor is essentially free of pressure hysteresis.
Compensation of the temperature influence on pressure offset and scale is
performed by the SBE MicroCAT’s CPU.
Notes:
• Help files provide detailed
information on the use
of SEATERM and SBE
Data Processing.
• A separate software manual
on CD-ROM contains detailed
information on the setup and
use of SBE Data Processing.
The MicroCAT is supplied with a powerful Win 2000/XP software package,
SEASOFT©-Win32, which includes:
•
SEATERM –terminal program for easy communication and
data retrieval.
•
SBE Data Processing - program for calculation and plotting of
conductivity, temperature, pressure (optional), and derived variables such
as salinity and sound velocity.
9
Section 2: Description of MicroCAT
Specifications
Note:
Pressure ranges are expressed
in meters of deployment depth
capability.
Temperature
(°C)
Conductivity (S/m)
Optional
Pressure
Measurement
Range
-5 to +35
0 to 7
(0 to 70 mS/cm)
0 to full scale range:
20 / 100 / 350 / 600 /
1000 / 2000 / 3500 /
7000 meters
Initial Accuracy
0.002
0.0003
(0.003 mS/cm)
0.1% of
full scale range
Typical Stability
(per month)
0.0002
0.0003
(0.003 mS/cm)
0.004% of
full scale range
Resolution
0.0001
0.00001
(0.0001 mS/cm)
0.002% of
full scale range
Sensor
Calibration
+1 to +32
0 to 6; physical calibration
over range 2.6 to 6 S/m,
plus zero conductivity (air)
Ambient pressure to
full scale range in
5 steps
Counter
Time-Base
Memory
Quartz TCXO, ±2 ppm per year aging;
±5 ppm vs. temperature (-5 to +30 °C)
2048K byte non-volatile FLASH memory
Converted temperature and conductivity: 5 bytes per sample
(2.5 bytes each). Time: 4 bytes per sample.
Pressure (optional): 2 bytes per sample.
Data Storage
Recorded Parameters
C and T
C, T, and P
C, T, and time
C, T, P, and time
Memory Space (number of samples)
410,000
290,000
225,000
185,000
Watch-crystal type 32,768 Hz; corrected for drift and aging by
Real-Time Clock comparison to MicroCAT counter time-base to produce overall
± 5 ppm accuracy (±2.6 minutes/year)
Nominal 7.2 Ampere-hour pack consisting of six 9-volt lithium
Standard Internal batteries. Capacity for more than 300,000 samples for a typical
Batteries
sampling scheme (see Battery Endurance for example calculation).
See Shipping Precautions in Section 1: Introduction.
0.5 Amps at 9-24 VDC. To avoid draining the internal batteries,
External Input
use an external voltage greater than 10 VDC.
Power (optional)
See External Power (Optional).
Quiescent current: 10 microamps.
Acquisition time: 1 – 3 seconds per sample (depending on
sampling mode and inclusion of pressure sensor)
for 1 measurement per sample (NAvg=1).
Power
Requirements
Standard 37-SM without external power option Communication current: 38 milliamps.
Sampling current:
- 20 milliamps for autonomous or serial line sync sampling.
- 39 milliamps for polled sampling.
37-SM with external power option Communication current: 35 milliamps.
Sampling current: 35 milliamps.
CAUTION:
See Section 5: Routine
Maintenance and Calibration for
handling instructions for the
plastic ShallowCAT housing.
Housing and
Depth Rating
Standard: Titanium housing, 7000 m (23,000 ft)
Optional: Plastic ShallowCAT housing, 250 m (820 ft)
Standard titanium housing:
Weight
In air: 3.8 kg (8.3 lbs)
In water: 2.3 kg (5.1 lbs)
(without pressure
Optional plastic ShallowCAT housing:
sensor)
In air: 2.7 kg (6.0 lbs)
In water: 1.2 kg (2.7 lbs)
10
Section 2: Description of MicroCAT
Dimensions and End Cap Connector
Pressure
port
139.7
(5.50)
Dimensions in
millimeters (inches)
19.0
(0.75)
87.6
(3.45)
67.3
(2.65)
102.9
(4.05)
108.0
(4.25)
62.2 (2.45)
Diameter
27.9
(1.10)
47.5
(1.87)
Clamp
241.3
(9.50)
6.63
(0.261)
Diameter
4 places
563.9
(22.20)
419.1
(16.50)
Guide
19.0
(0.75)
Connector
113.8
(4.48)
87.6
(3.45)
Standard Wire Mounting
Clamp and Guide
11
108.0
(4.25)
Alternate Flat Surface
Mounting Brackets
Section 2: Description of MicroCAT
Sample Timing
Notes:
• Acquisition time shown does not
include time to transmit real-time
data, which is dependent on
baud rate.
• If date and time are stored with
the data, time is the time at the
start of the sample, after a small
amount of time for the MicroCAT
to wake up and prepare to
sample. For example, if the
MicroCAT is programmed to wake
up and sample at 12:00:00, the
stored time will indicate 12:00:01
or 12:00:02.
Sample timing is dependent on several factors, including:
• Sampling mode – autonomous, polled, or serial line sync
• Inclusion of optional pressure sensor in MicroCAT
• Number of measurements taken per sample (NAvg)
Autonomous Sampling
Power on time for each sample while logging:
• With pressure: 2.83 seconds + 1.27 seconds * (NAvg - 1)
• Without pressure: 2.33 seconds + 0.87 seconds * (NAvg - 1)
The MicroCAT goes into quiescent (sleep) state for at least 2 seconds between
each sample. If NAvg is large, the time required to sample plus the quiescent
time may be more than the interval between samples (Interval); the
MicroCAT will then internally set the sampling rate to Interval plus the actual
required sampling time.
Example 1: Interval=10, NAvg=1, no pressure sensor
Sampling time = 2.33 seconds + 0.87 seconds * (NAvg - 1) = 2.33 + 0.87 * (1 - 1) = 2.33 seconds
2.33 seconds + 2 seconds (for quiescent state) = 4.33 seconds < 10 second sample interval, OK.
Example 2: Interval=10, NAvg=8, no pressure sensor
Sampling time = 2.33 seconds + 0.87 seconds * (NAvg - 1) = 2.33 + 0.87 * (8 - 1) = 8.4 seconds
8.4 seconds + 2 seconds (for quiescent state) = 10.4 seconds > 10 second sample interval.
Therefore, MicroCAT internally sets sampling rate to:
(Interval + actual required sampling time) = 10 seconds + 8.4 seconds = 18.4 seconds
Polled Sampling
Time from receipt of take sample command to beginning of reply:
• With pressure: 1.72 seconds + 1.27 seconds * (NAvg - 1)
• Without pressure: 1.22 seconds + 0.87 seconds * (NAvg - 1)
Minimum time (approximate) required from beginning of one sample to
beginning of next sample, if NAvg=1:
• After TS command – 2 seconds
• After TSSOn command – 3 seconds
• After TSS command – 5 seconds
Serial Line Sync Sampling
Power on time for each sample:
• With pressure: 2.83 seconds + 1.27 seconds * (NAvg - 1)
• Without pressure: 2.33 seconds + 0.87 seconds * (NAvg - 1)
12
Section 2: Description of MicroCAT
Battery Endurance
Notes:
• If the MicroCAT is logging data
and the battery voltage is less
than 6.15 volts for ten consecutive
scans, the MicroCAT halts logging
and displays a low battery
indication in the data.
• A MicroCAT with the external
power option has different power
draw characteristics than the
standard MicroCAT, even when
used with internal batteries.
Verify which type of MicroCAT
you have before calculating
battery endurance.
• See Specifications above for
data storage limitations.
The battery pack has a nominal capacity of 7.2 amp-hours. For planning
purposes, Sea-Bird recommends using a conservative value of 5 amp-hours.
Current consumption is as follows:
• Acquisition time is shown above in Sample Timing. Acquisition current
varies, depending on the type of MicroCAT.
- Standard MicroCAT without external power option - Sampling
(acquisition) current is 20 milliamps for autonomous or serial line sync
sampling; 39 milliamps for polled sampling.
- MicroCAT with external power option – Sampling (acquisition) current
is 35 milliamps.
• Quiescent current is less than 10 microamps (0.09 AH per year).
The time required for each sample is dependent on the user-programmed
sampling mode, number of measurements per sample, and inclusion of a
pressure sensor in the MicroCAT (see Sample Timing above). So, battery
endurance is highly dependent on the application. Two examples follow.
Example 1: A standard MicroCAT (no external power option) with no pressure sensor is set up to sample autonomously
every 10 minutes (6 samples/hour), taking 1 measurement per sample (NAvg=1). How long can it be deployed?
Sampling time = 2.33 seconds + 0.87 seconds * (NAvg - 1) = 2.33 + 0.87 * (1 – 1) = 2.33 seconds
Sampling current consumption = 0.020 amps * 2.33 seconds = 0.047 amp-seconds/sample
In 1 hour, sampling current consumption = 6 * 0.047 amp-seconds/sample = 0.28 amp-seconds/hour
Quiescent current ≈ 10 microamps = 0.01 mA
In 1 hour, quiescent current consumption = 0.01 mA * 3600 seconds/hour = 0.036 amp-seconds/hour
Total current consumption / hour = 0.28 + 0.036 = 0.32 amp-seconds/hour
Capacity = (5 amp-hours * 3600 seconds/hr) / (0.32 amp-seconds/hour) = 56250 hours = 2343 days = 6.4 years
However, Sea-Bird recommends that batteries should not be expected to last longer than 2 years in the field.
Number of samples = 56250 hours * 6 samples/hour = 337,000 samples
Example 2: Same as above, but taking 20 measurements per sample (NAvg=20). How long can it be deployed?
Sampling time = 2.33 seconds + 0.87 seconds * (NAvg - 1) = 2.33 + 0.87 * (20 – 1) = 18.86 seconds
Sampling current consumption = 0.02 amps * 18.86 seconds = 0.38 amp-seconds/sample
In 1 hour, sampling current consumption = 6 * 0.38 amp-seconds/sample = 2.28 amp-seconds/hour
Quiescent current = 10 microamps = 0.01 mA
In 1 hour, quiescent current consumption ≈ 0.01 mA * 3600 seconds/hour = 0.036 amp-seconds/hour
Total current consumption / hour = 2.28 + 0.036 = 2.32 amp-seconds/hour
Capacity = (5 amp-hours * 3600 seconds/hr) / (2.32 amp-seconds/hour) =7758 hours = 323 days = 0.9 years
Number of samples = 7758 hours * 6 samples/hour = 46,500 samples
External Power (optional)
The MicroCAT can be ordered with an optional ability to be powered from an
external source, which supplies 5 Amps at 9 – 24 VDC. The internal lithium
pack is diode-OR’d with the external source, so power is drawn from
whichever voltage source is higher. The MicroCAT can also be operated from
the external supply without having the lithium batteries installed. Electrical
isolation of conductivity is retained in units with the external power option,
preventing ground loop noise contamination in the conductivity measurement.
13
Section 2: Description of MicroCAT
Cable Length and Optional External Power
Note:
See Real-Time Data Acquisition
in Section 4: Deploying and
Operating MicroCAT for baud rate
limitations on cable length if
transmitting real-time data.
Note:
Common wire resistances:
Gauge
12
14
16
18
19
20
22
24
26
28
Resistance (ohms/foot)
0.0016
0.0025
0.0040
0.0064
0.0081
0.0107
0.0162
0.0257
0.0410
0.0653
There are two issues to consider if powering the MicroCAT externally:
• Limiting the communication IR loss to 1 volt if transmitting real-time
data; higher IR loss will prevent the instrument from transmitting realtime data because of the difference in ground potential.
• Supplying enough power at the power source so that sufficient power is
available at the instrument after considering IR loss.
Each issue is discussed below.
Limiting Communication IR Loss to 1 Volt if Transmitting Real-Time Data
The limit to cable length is typically reached when the maximum
communication current times the power common wire resistance is more than
1 volt, because the difference in ground potential of the MicroCAT and ground
controller prevents the MicroCAT from transmitting real-time data.
V limit = 1 volt = IR limit
Maximum cable length = R limit / wire resistance per foot
where I = communication current required by MicroCAT (35 milliamps for
MicroCAT with external power option; see Specifications).
Example 1 – For 20 gauge wire, what is maximum distance to transmit power to MicroCAT if transmitting real-time data?
For 35 milliamp communications current, R limit = V limit / I = 1 volt / 0.035 Amps = 28.5 ohms
For 20 gauge wire, resistance is 0.0107 ohms/foot.
Maximum cable length = 28.5 ohms / 0.0107 ohms/foot = 2670 feet = 814 meters
Example 2 – Same as above, but there are 4 MicroCATs powered from the same power supply.
For 35 milliamp communications current, R limit = V limit / I = 1 volt / (0.035 Amps * 4 MicroCATs) = 7.1 ohms
Maximum cable length = 7.1 ohms / 0.0107 ohms/foot = 667 feet = 203 meters (to MicroCAT furthest from power source).
Supplying Enough Power to MicroCAT
Another consideration in determining maximum cable length is supplying
enough power at the power source so that sufficient voltage is available, after
IR loss in the cable (from the 0.5 Amp turn-on transient, two-way resistance),
to power the MicroCAT. The power requirement varies, depending on whether
any power is drawn from the batteries:
• Provide at least 10 volts, after IR loss, to prevent the MicroCAT from
drawing any power from the batteries (if you do not want to draw down
the batteries): V - IR > 10 volts
• Provide at least 7 volts, after IR loss, if allowing the MicroCAT to draw
down the batteries or if no batteries are installed: V - IR > 7 volts
where I = MicroCAT turn-on transient (0.5 Amps; see Specifications).
Example 1 – For 20 gauge wire, what is maximum distance to transmit power to MicroCAT if using 12 volt power source
and deploying MicroCAT with no batteries?
V - IR > 7 volts
12 volts - (0.50 Amps) * (0.0107 ohms/foot * 2 * cable length) > 7 volts
Cable length < 467 ft = 142 meters
5 volts > (0.50 Amps) * (0.0107 ohms/foot * 2 * cable length)
Note that 142 meters < 814 meters (maximum distance if MicroCAT is transmitting real-time data), so IR drop in power
is controlling factor for this example. Using a higher voltage power supply or a different wire gauge would increase
allowable cable length.
Example 2 – Same as above, but there are 4 MicroCATs powered from same power supply.
V - IR > 7 volts
12 volts - (0.50 Amps * 4 MicroCATs) * (0.0107 ohms/foot * 2 * cable length) > 7 volts
5 volts > (0.50 Amps * 4 MicroCATs) *(0.0107 ohms/foot * 2 * cable length)
Cable length < 116 ft = 35 meters (to MicroCAT furthest from power source)
14
Section 3: Preparing MicroCAT for Deployment
Section 3:
Preparing MicroCAT for Deployment
This section describes the pre-check procedure for preparing the MicroCAT
for deployment. Installation of the battery pack, installation of Sea-Bird
software, and testing power and communications are discussed.
Battery Installation
WARNING!
Do not air-ship the MicroCAT
with batteries installed.
See Shipping Precautions in
Section 1: Introduction.
Description of Batteries and Battery Pack
Sea-Bird supplies six 9-volt batteries, shipped with the MicroCAT in a
separate bag.
In addition to the six 9-volt batteries, the assembled battery pack consists of:
• a brass sleeve with lower printed circuit board (PCB) containing
banana jacks
• upper PCB containing banana plugs
No soldering is required when assembling the battery pack because the
batteries use the banana plugs and jacks as (+) and (-) terminals.
Installing Batteries
CAUTION:
See Section 5: Routine
Maintenance and Calibration for
handling instructions for the
plastic ShallowCAT housing.
Screws securing
connector
end cap (screws
shown partially
removed)
1.
Remove the I/O connector end cap:
A. Wipe the outside of the I/O end cap and housing dry, being careful to
remove any water at the seam between them.
B. Remove the two flat Phillips-head titanium machine screws. Do not
remove any other screws from the housing.
C. Remove the I/O end cap by pulling firmly and steadily on the plastic
cable mounting guide. It may be necessary to twist or rock the end
cap back and forth or use a non-marring tool on the edge of the cap to
loosen it.
D. The end cap is electrically connected to the electronics with a Molex
connector. Holding the wire cluster near the connector, pull gently to
detach the female end of the connector from the pins.
E. Remove any water from the O-ring mating surfaces inside the
housing with a lint-free cloth or tissue.
F. Put the end cap aside, being careful to protect the O-rings from
damage or contamination.
Cable
mounting
guide
Molex connector
O-rings
15
Section 3: Preparing MicroCAT for Deployment
2.
Remove the battery pack assembly from the housing:
A. Remove the large Phillips-head screw and lock washer from the
upper PCB.
B. Lift the battery pack assembly straight out of the housing, using
the handle.
3.
Remove the two small Phillips-head screws and lock washers from the
upper PCB, and lift the upper PCB off the brass sleeve.
4.
Insert each 9-volt battery onto the lower PCB, one at a time, banana plug
end (+) first. Ensure each battery is fully inserted.
5.
Reinstall the upper PCB:
A. Press the upper PCB onto the battery pack assembly, aligning the
screw holes and mating banana plugs to the batteries. Ensure the
banana plugs are fully inserted into the batteries.
B. Re-fasten the upper PCB to the battery pack assembly with the two
small screws and lock washers.
6.
Replace the battery pack assembly in the housing:
A. Align the D-shaped opening in the upper PCB with the D-shaped
notch on the shaft. Lower the assembly slowly into the housing, and
once aligned, push gently to mate the banana plugs on the battery
compartment bulkhead with the lower PCB. A post at the bottom of
the battery compartment mates with a hole in the battery pack’s lower
PCB to prevent improper alignment.
B. Secure the assembly to the shaft using the large Phillips-head screw
and lock washer. Ensure the screw is tight to provide a reliable
electrical contact.
7.
Reinstall the I/O connector end cap:
A. Remove any water from the O-rings and mating surfaces in the
housing with a lint-free cloth or tissue. Inspect the O-rings and
mating surfaces for dirt, nicks, and cuts. Clean as necessary. Apply a
light coat of O-ring lubricant (Parker Super O Lube) to the O-rings
and mating surfaces.
B. Plug the female end of the Molex connector onto the pins, with the
flat portion of the female end against the flat portion of the ‘D’
cutout. Verify the connector is properly aligned – a backward
connection will prevent communication with the computer.
C. Carefully fit the end cap into the housing until the O-rings are
fully seated.
D. Reinstall the flat Phillips-head titanium screws to secure the end cap.
Handle
Large
screw
Small
screws
Battery pack
assembly
Brass
sleeve
Upper
PCB
Battery
D-shaped
notch
16
Section 3: Preparing MicroCAT for Deployment
Software Installation
Recommended minimum system requirements for software:
Windows 2000 or later, 500 MHz processor, 256 MB RAM, and 90 MB free
disk space for installation.
Note:
It is possible to use the MicroCAT
without SEATERM by sending
direct commands from a dumb
terminal or terminal emulator, such
as Windows HyperTerminal.
If not already installed, install SEATERM and other Sea-Bird software
programs on your computer using the supplied software CD: :
1.
Insert the CD in your CD drive.
2.
Double click on Seasoft-Win32.exe.
3.
Follow the dialog box directions to install the software.
The default location for the software is c:/Program Files/Sea-Bird. Within that
folder is a sub-directory for each program. The installation program allows
you to install the desired components. Install all the components, or just install
SEATERM (terminal program) and SBE Data Processing.
Power and Communications Test
The power and communications test will verify that the system works,
prior to deployment.
Test Setup
Locking
sleeve
Dummy plug
1.
Remove dummy plug (if applicable):
A. By hand, unscrew the locking sleeve from the MicroCAT’s bulkhead
connector. If you must use a wrench or pliers, be careful not to loosen
the bulkhead connector instead of the locking sleeve.
B. Remove the dummy plug from the MicroCAT’s I/O bulkhead
connector by pulling the plug firmly away from the connector.
2.
Standard Connector - Install the I/O cable connector, aligning the raised
bump on the side of the connector with the large pin (pin 1 - ground) on
the MicroCAT. OR
MCBH Connector – Install the I/O cable connector, aligning the pins.
3.
Connect the I/O cable to your computer’s serial port.
Standard MicroCAT
Ground Pin
1 (large) –
align with
raised
bump on
connector
17
Section 3: Preparing MicroCAT for Deployment
Test
Note:
See SEATERM’s help files.
1.
Double click on SeaTerm.exe. If this is the first time the program is used,
the setup dialog box may appear:
SBE37
Select the instrument type (SBE 37) and the computer COM port for
communication with the MicroCAT. Click OK.
2.
The main screen looks like this:
Menus
Toolbar
Command/Data Echo Area
Status bar
Note:
There is at least one way, and as
many as three ways, to enter
a command:
• Manually type a command in
Command/Data Echo Area.
• Use a menu to automatically
generate a command.
• Use a Toolbar button to
automatically generate
a command.
Instrument
EPROM version
•
•
Note:
Once the system is configured and
connected (Steps 3 through 5
below), to update the Status bar:
• on the Toolbar, click Status; or
• from the Utilities menu, select
Instrument Status.
SEATERM sends the status
command, which displays in the
Command/Data Echo Area, and
updates the Status bar.
Computer
COM port
Instrument
•
•
Upload
parameter
Capture
to file
status –
grayed
out if not
capturing
Baud rate, data bits,
stop bits, and parity
Menus – Contains tasks and frequently executed
instrument commands.
Toolbar – Contains buttons for frequently executed tasks and
instrument commands. All tasks and commands accessed through the
Toolbar are also available in the Menus. To display or hide the
Toolbar, select View Toolbar in the View menu. Grayed out Toolbar
buttons are not applicable.
Command/Data Echo Area – Echoes a command executed using a
Menu or Toolbar button, as well as the instrument’s response.
Additionally, a command can be manually typed in this area, from the
available commands for the instrument. Note that the instrument must
be awake for it to respond to a command (use Connect on the Toolbar
to wake up the instrument).
Status bar – Provides status information. To display or hide the Status
bar, select View Status bar in the View menu.
18
Section 3: Preparing MicroCAT for Deployment
Following are the Toolbar buttons applicable to the MicroCAT:
Toolbar
Buttons
Description
Re-establish communications with MicroCAT.
Computer responds with S> prompt. MicroCAT
Connect
goes to sleep after 2 minutes without
communication from computer have elapsed.
Display instrument setup and status (logging,
Status
number of samples in memory, etc.).
Coefficients Display calibration coefficients.
Capture instrument responses on screen to file;
may be useful for diagnostics. File has .cap
Capture
extension. Press Capture again to turn off
capture. Capture status displays in Status bar.
Upload data stored in memory, in format Convert
utility can use to allow for post-processing by
SBE Data Processing. Uploaded data has .asc
extension. Before using Upload:
Upload
• Configure upload and header parameters in
Configure menu.
• Send Stop to stop logging.
Convert uploaded .asc data file to .cnv data file,
Convert
which can be processed by SBE Data Processing.
Perform one or more diagnostic tests on
MicroCAT. Diagnostic test(s) accessed in this
Diagnostics
manner are non-destructive – they do not write
over any existing instrument settings.
Interrupt and end current activity, such as
Stop
uploading or diagnostic test.
Free computer COM port used to communicate
Disconnect with MicroCAT. COM port can then be used by
another program.
*See Command Descriptions in Section 4: Deploying and
Operating MicroCAT.
19
Equivalent
Command*
(press Enter
key)
DS
DC
—
DDb,e
(use Upload
key if you will
be processing
data with SBE
Data
Processing)
—
DS, DC, TS,
and TSR
—
—
Section 3: Preparing MicroCAT for Deployment
3.
In the Configure menu, select SBE 37. The dialog box looks
like this:
Computer COM port, baud rate,
data bits, and parity for
communication between computer
and MicroCAT.
Notes:
• SEATERM’s baud rate must be the
same as the MicroCAT baud rate
(set with Baud=). Baud is factory-set
to 9600, but can be changed by the
user (see Command Descriptions in
Section 4: Deploying and Operating
MicroCAT).
• When you click OK, SEATERM
saves the Configuration Options
settings to the SeaTerm.ini file in
your Windows directory.
SeaTerm.ini contains the last saved
settings for each instrument
(SBE 37, 39, etc.). When you open
SEATERM and select the desired
instrument in the Configure menu,
the Configuration Options dialog box
shows the last saved settings for
that instrument.
Interface for communication
between computer and
MicroCAT.
Make the selections in the Configuration Options dialog box:
• COMM Port: COM 1 through COM 10, as applicable
• Baud Rate: 9600 (documented on Configuration Sheet in manual)
• Data Bits: 8
• Parity: None
• Mode: RS-232 (Full Duplex)
Click OK to save the settings.
4.
In the Communications menu, select Options / Cycle baud
when connecting.
5.
Click Connect on the Toolbar. SEATERM tries to connect to the
MicroCAT at the baud set in Step 3. If it cannot, it cycles through all other
possible baud rates to try to connect. When it connects, the display looks
like this:
. . . Communication Established
S>
This shows that correct communications between the computer and the
MicroCAT has been established.
If the system does not respond with the S> prompt:
• Click Connect again or press the Enter key twice.
• Verify the correct instrument was selected in the Configure menu and
the settings were entered correctly in the Configuration Options
dialog box. Note that the baud rate is documented on the
Configuration Sheet in this manual.
• Check cabling between the computer and MicroCAT.
20
Section 3: Preparing MicroCAT for Deployment
6.
Note:
The MicroCAT has a 2 minute
timeout algorithm designed to:
• restore control to the computer if
an illegal command is sent
• conserve battery energy if
too much time elapses
between commands
If the system does not appear to
respond, click Connect on the
Toolbar to reestablish
communications.
Display MicroCAT status information by clicking Status on the Toolbar.
The display looks like this:
SBE37-SM V 2.6 SERIAL NO. 2165 20 Nov 2004 08:49:08
logging not started
sample interval = 30 seconds
samplenumber = 52, free = 190598
do not transmit real-time data
do not output salinity with each sample
do not output sound velocity with each sample
store time with each sample
number of samples to average = 1
serial sync mode disabled
wait time after serial sync sampling = 120 seconds
internal pump not installed
temperature = 7.54 deg C
7.
Command the MicroCAT to take a sample by typing TS and pressing the
Enter key. The display looks like this (if optional pressure sensor
installed, Format=1, and not outputting salinity or sound velocity):
23.7658,0.00019, 0.062, 20 Nov 2004, 08:49:10
where
23.7658 = temperature in degrees Celsius
0.00019 = conductivity in S/m
0.062 = pressure in decibars
20 Nov 2004 = date
08:49:10 = time
These numbers should be reasonable; i.e., room temperature, zero
conductivity, barometric pressure (gauge pressure), current date and time
(shipped from the factory set to Pacific Daylight or Standard Time).
8.
Command the MicroCAT to go to sleep (quiescent state) by typing QS
and pressing the Enter key.
The MicroCAT is ready for programming and deployment.
21
Section 4: Deploying and Operating MicroCAT
Section 4:
Deploying and Operating MicroCAT
This section includes:
• system operation with example sets of operation commands
• baud rate and cable length considerations
• detailed command descriptions
• data output formats
• deploying and recovering the MicroCAT
• uploading and processing data from the MicroCAT’s memory
Sampling Modes
The MicroCAT has three basic sampling modes for obtaining data:
•
Polled Sampling – On command, the MicroCAT takes one sample.
•
Autonomous Sampling – At pre-programmed intervals, the MicroCAT
wakes up, samples, stores data in memory, and goes to sleep.
•
Serial Line Synchronization – In response to a pulse on the serial line, the
MicroCAT wakes up, samples, stores data in memory, and goes to sleep.
Commands can be used in various combinations to provide a high degree of
operating flexibility.
Descriptions and examples of the sampling modes follow. Note that the
MicroCAT’s response to each command is not shown in the examples. Review
the operation of the basic sampling modes and the commands described in
Command Descriptions before setting up your system.
Polled Sampling
On command, the MicroCAT takes NAvg measurements, averages the
measurements, and sends the averaged data to the computer. Storing of
data in the MicroCAT’s FLASH memory is dependent on the particular
command used.
Example: Polled Sampling (user input in bold)
Wake up MicroCAT. Set the number of measurements per sample to 1.
Command MicroCAT to take a sample, and send converted data
to computer (do not store data in MicroCAT’s memory). Send
power-off command.
(Click Connect on Toolbar to wake up.)
S>NAVG=1
S>TS
S>QS
22
Section 4: Deploying and Operating MicroCAT
Autonomous Sampling (Logging commands)
Note:
If the FLASH memory is filled to
capacity, sampling continues, but
excess data is not saved in memory
(i.e., the MicroCAT does not
overwrite the data in memory).
Note:
Use Stop to:
• stop logging
• stop waiting to start logging (after
StartLater has been sent)
Once Stop is sent, the MicroCAT will
accept all commands again.
At pre-programmed intervals (Interval) the MicroCAT wakes up, samples
data (taking NAvg measurements for each sample and averaging the
measurements), stores the averaged data in its FLASH memory, and goes to
sleep (enters quiescent state). Logging is started with StartNow or
StartLater, and is stopped with Stop. Transmission of real-time averaged data
to the computer is dependent on TxRealTime.
The MicroCAT has a lockout feature to prevent unintended interference with
sampling. If the MicroCAT is logging or waiting to start logging (StartLater
has been sent, but logging has not started yet), the MicroCAT will only accept
the following commands: DS, DC, TS, TSR, SL, SLT, SLTR, QS, and Stop.
Additionally, if the MicroCAT is logging, it cannot be interrupted during
measurements to accept any commands. If the MicroCAT is logging and
appears unresponsive, it may be in the middle of taking measurements;
continue to try to establish communications. Note that if NAvg is large in
comparison to Interval, there will only be a very short period of time between
samples when the MicroCAT can be interrupted; this may make it difficult to
interrupt or stop sampling.
Example: Autonomous Sampling (user input in bold).
Wake up MicroCAT. Set sample number to 0 to overwrite previous data in
memory. Set up to sample every 60 seconds, with 1 measurement
averaged per sample. Store time and date with samples, and do not
transmit real-time data to computer. Set up to automatically start logging
on 10 January 2005 at 12:00:00. Send power-off command after all
parameters are entered – system will automatically wake up and go to
sleep for each sample.
(Click Connect on Toolbar to wake up.)
S>SAMPLENUM=0
S>INTERVAL=60
S>NAVG=1
S>STORETIME=Y
S>TXREALTIME=N
S>STARTMMDDYY=011005
S>STARTHHMMSS=120000
S>STARTLATER
S>DS
(to verify setup)
S>QS
After logging begins, look at data from last sample to check results, and
then go to sleep:
(Click Connect on Toolbar to wake up.)
S>SL
S>QS
When ready to upload all data to computer, wake up MicroCAT, stop
sampling, upload data, and then go to sleep:
(Click Connect on Toolbar to wake up.)
S>STOP
(Click Upload on Toolbar – program leads you through screens to define
data to be uploaded and where to store it.)
S>QS
23
Section 4: Deploying and Operating MicroCAT
Serial Line Synchronization (Serial Line Sync)
Serial Line Sync allows a simple pulse on the RS-232 line to initiate a sample.
This mode provides easy integration with ADCPs or current meters, which can
synchronize MicroCAT sampling with their own without drawing on their
battery or memory resources.
Note:
Use DS to view Serial Line Sync
enable/disable status.
If this mode is enabled (SyncMode=Y) and the MicroCAT is
powered down, setting the RS-232 RX line high (space state, 3 –10 VDC)
for 1 to 1000 milliseconds initiates the following sampling sequence:
• Wake up
• Take sample (consisting of NAvg measurements)
• Store averaged data in FLASH memory
• Output real-time converted averaged data
After executing the above sequence, the MicroCAT checks the RS-232 line
and SyncWait. These determine whether to power down immediately or
accept commands from the computer, and whether to leave the serial line sync
mode enabled or disable it:
• SyncWait=0 and Mark State (RS-232 RX line less than 0.5 volts) MicroCAT immediately goes to sleep. Serial line sync mode remains
enabled (SyncMode=Y).
• SyncWait=0 and Space State (RS-232 RX line greater than 3 volts) MicroCAT monitors the RS-232 line for a time equivalent to
25 characters (actual length of time is dependent on the baud rate):
¾ Line remains in space state - MicroCAT disables serial line sync
mode (sets SyncMode=N) at end of time. Once serial line sync mode
is disabled, place the MicroCAT in mark state; you can then
communicate with the MicroCAT using the full range of commands
(polled sampling, logging, upload, etc.).
¾ Line returns to mark state - MicroCAT immediately goes to sleep.
Serial line sync mode remains enabled (SyncMode=Y).
• SyncWait>0
MicroCAT monitors the RS-232 line for SyncWait seconds. During this
time, place the MicroCAT in mark state. Each time a carriage return
(Enter key) is detected, the time-out clock is reset to 2 minutes. Within
that time period, you can communicate with the MicroCAT using the full
range of commands (polled sampling, logging, upload, etc.). While the
MicroCAT is monitoring:
¾ If more than 25 break characters are received - MicroCAT disables
serial line sync mode (sets SyncMode=N). Once serial line sync
mode is disabled, you can communicate with the MicroCAT using the
full range of commands (polled sampling, logging, upload, etc.).
¾ If less than 25 break characters are received - MicroCAT goes to
sleep when the time-out clock runs down. Serial line sync mode
remains enabled (SyncMode=Y).
Note:
If running SEATERM, select
Send 5 second break in the
Communications menu to hold the
RS-232 RX line in space state for
5 seconds. This will always be
more than 25 break characters, and
will cause the MicroCAT to exit
serial line sync mode.
In summary, to disable serial line sync mode after executing the
sampling sequence:
• If SyncWait=0
Put RS-232 line in space state (greater then 3 volts) for time equivalent to
25 characters.
• If SyncWait>0
¾ Put RS-232 line in space state (greater then 3 volts) for time
equivalent to 25 characters, or
¾ If SyncWait is greater than 5 seconds, put the MicroCAT in mark
state within 3 seconds of executing the sampling sequence, then send
SyncMode=N after waiting at least 3 seconds after executing the
sampling sequence.
24
Section 4: Deploying and Operating MicroCAT
Example: Serial Line Sync (user input in bold)
Wake up MicroCAT. Set sample number to 0 to overwrite previous data in memory. Set NAvg=1 to
take 1 measurement per sample. Set SyncWait to 0 seconds and enable serial line sync mode. Send power
off command.
(Click Connect on Toolbar to wake up.)
S>SAMPLENUM=0
S>NAVG=1
S>SYNCWAIT=25
S>SYNCMODE=Y
S>DS
(to verify setup)
S>QS
When ready to take a sample (repeat as desired):
(Set RS-232 RX line high [3-10 VDC] for 1-1000 milliseconds [space state]. MicroCAT takes
4 measurements, stores averaged data in memory, and outputs converted averaged data. Set RS-232 RX
line low [<0.5 VDC] [mark state] – MicroCAT goes to sleep.)
(Repeat this process at periodic intervals as desired.)
When ready to upload all data to computer, disable serial line sync mode, and then upload data and
go to sleep:
(Set RS-232 RX line high [3-10 VDC] for 5 seconds [space state].
MicroCAT disables serial line sync mode (sets SyncMode=N).)
(Set RS-232 RX line low [<0.5 VDC] [mark state].)
(Press Enter key to get S> prompt.)
S>DS (to verify MicroCAT is communicating)
(Click Upload on Toolbar – program leads you through screens to define data to be uploaded and where to
store it.)
S>QS
Real-Time Data Acquisition
Notes:
• Baud rate is set with Baud=.
Set TxRealTime=Y to output
real-time data. See Command
Descriptions in this section for
command details.
• If using external power, see
External Power (optional) in
Section 2: Description of
MicroCAT for power limitations
on cable length.
The length of cable that the MicroCAT can drive is dependent on the baud
rate. The allowable combinations are:
Maximum Cable Length (meters)
1600
800
400
200
100
50
25
Maximum Baud Rate
600
1200
2400
4800
9600
19200
38400
If acquiring real-time data, click Capture on SEATERM’s Toolbar before you
begin logging. The data displayed in SEATERM will be saved to the
designated file. Process the data as desired. Note that this real-time data file
cannot be processed by SBE Data Processing, as it does not have the
required headers and format. To process data with SBE Data Processing,
upload the data from the MicroCAT’s memory.
25
Section 4: Deploying and Operating MicroCAT
Timeout Description
The MicroCAT has a timeout algorithm. If the MicroCAT does not receive a
command for two minutes, it powers down its communication circuits to
prevent exhaustion of the batteries. To re-establish control (wale up), click
Connect on the Toolbar or press the Enter key. The system responds with
the S> prompt.
Command Descriptions
This section describes commands and provides sample outputs.
See Appendix III: Command Summary for a summarized command list.
When entering commands:
•
Input commands to the MicroCAT in upper or lower case letters and
register commands by pressing the Enter key.
•
The MicroCAT sends ? CMD if an invalid command is entered.
•
If the system does not return an S> prompt after executing a command,
press the Enter key to get the S> prompt.
•
If a new command is not received within two minutes after the completion
of a command, the MicroCAT returns to the quiescent (sleep) state.
•
If in quiescent state, re-establish communications by clicking Connect on
the Toolbar or pressing the Enter key to get an S> prompt.
26
Section 4: Deploying and Operating MicroCAT
Status Command
Note:
If the battery voltage is below
6.15 volts, the following displays in
response to DS:
WARNING: LOW BATTERY
VOLTAGE!! Replace the
batteries before continuing.
DS
Display operating status and setup.
Equivalent to Status on Toolbar.
List below includes, where applicable,
command used to modify parameter.
• firmware version, serial number, date
and time [MMDDYY= or DDMMYY=,
and HHMMSS=]
•
•
•
•
•
•
•
•
•
•
•
•
Note:
The 37-SM and 37-SMP use the
same firmware. The internal pump
is applicable to the 37-SMP only.
logging status
sample interval time [Interval=]
number of samples in memory
[SampleNum=] and available sample
space in memory
data acquired with autonomous
sampling to be transmitted real-time
[TxRealTime=]?
output salinity with each sample
[OutputSal=]?
output sound velocity with each
sample [OutputSV=]?
store date and time with each sample
acquired with autonomous sampling
[StoreTime=]?
number of measurements to average
for each sample [NAvg=]
reference pressure [RefPress=]; only
displays if no pressure sensor installed
serial sync mode state [SyncMode=]
serial sync mode wait time [SyncWait=]
internal pump installed?
(never installed in 37-SM)
[PumpInstalled=N]
•
current temperature
Logging status can be:
•
•
•
•
•
•
logging not started
logging data
not logging: waiting to start at…
not logging:received stop command
not logging: low battery
unknown status
Example: Display status for MicroCAT (user input in bold, command used to modify parameter in parentheses).
S>DS
SBE37-SM V 2.6 SERIAL NO. 2165 20 Nov 2004 08:49:08
[MMDDYY=, HHMMSS=]
logging data
sample interval = 30 seconds
[Interval=]
samplenumber = 52, free = 190598
[SampleNum=]
do not transmit real-time data
[TxRealTime=]
do not output salinity with each sample
[OutputSal=]
do not output sound velocity with each sample
[OutputSV=]
store time with each sample
[StoreTime=]
number of samples to average = 1
[NAvg=]
reference pressure = 0.0 db
[RefPress=]
serial sync mode disabled
[SyncMode=]
wait time after serial sync sampling = 120 seconds
[SyncWait=]
internal pump not installed
[PumpInstalled=N; only valid setting for 37-SM]
temperature = 7.54 deg C
27
Section 4: Deploying and Operating MicroCAT
Setup Commands
Notes:
• DDMMYY= and MMDDYY= are
equivalent. Either can be used to
set the date.
• If the battery pack has been
removed, date and then time
must be reset.
• Always set date and then time.
If a new date is entered but not a
new time, the new date will not
be saved. If a new time is
entered without first entering a
new date, the date will reset to
the last date it was set for with
MMDDYY= or DDMMYY=.
MMDDYY=mmddyy
Set real-time clock month, day, and year.
Must be followed by HHMMSS= to set time.
DDMMYY=ddmmyy
Set real-time clock day, month, and year.
Must be followed by HHMMSS= to set time.
HHMMSS=hhmmss
Set real-time clock hour, minute, second.
Example: Set current date and time to 10 July 2004 12:00:00
(user input in bold).
S>MMDDYY=071004
S>DDMMYY=100704
or
S>HHMMSS=120000
Baud=x
S>HHMMSS=120000
x= baud rate (600, 1200, 2400, 4800,
9600, 19200, or 38400). Default 9600.
Notes:
The MicroCAT’s baud rate (set with
Baud=) must be the same as
SEATERM’s baud rate (set in the
Configure menu).
Length of cable that MicroCAT can drive for
real-time data is dependent on baud:
Notes:
• The MicroCAT does not store
salinity and sound velocity in
memory if OutputSal=Y and
OutputSV=Y. It calculates and
outputs the values real-time or as
data is uploaded; therefore,
outputting these parameters has no
effect on the number of samples that
can be stored in memory.
• Salinity and sound velocity can also
be calculated in SBE Data
Processing, from data uploaded
from the MicroCAT’s memory.
OutputSal=x
Notes:
• See Data Output Formats below.
• Date and time are included in
autonomous sampling data only
if StoreTime=Y.
• Legend:
t = temperature (°C, ITS-90).
c = conductivity (Siemens/meter).
p = pressure (decibars); sent only if
optional pressure sensor installed.
s = salinity (psu); sent only if
OutputSal=Y.
v = sound velocity (m/sec); sent only
if OutputSV=Y.
dd mmm yyyy = day, month, year.
mm-dd-yyyy = month, day, year.
hh:mm:ss = hour, minute, second.
Format=x
Maximum Cable Length (meters)
Maximum Baud Rate
1600
800
400
200
100
50
25
600
1200
2400
4800
9600
19200
38400
x=Y: Calculate and output salinity (psu)
with each sample.
x=N: Do not.
OutputSV=x
x=Y: Calculate and output sound velocity
(m/sec) with each sample, using Chen and
Millero formula (UNESCO Technical
Papers in Marine Science #44).
x=N: Do not.
x=0: output raw hex data, for diagnostic
use at Sea-Bird
x=1 (default): output converted data.
ttt.tttt,cc.ccccc, pppp.ppp, sss.ssss,
vvvv.vvv, dd mmm yyyy, hh:mm:ss
x=2: output converted data.
ttt.tttt,cc.ccccc, pppp.ppp, sss.ssss,
vvvv.vvv, mm-dd-yyyy, hh:mm:ss
RefPress=x
x = reference pressure (gauge) in decibars.
MicroCAT without installed pressure
sensor uses this reference pressure in
conductivity (and optional salinity and
sound velocity) calculations. Entry ignored
if MicroCAT includes pressure sensor.
28
Section 4: Deploying and Operating MicroCAT
Setup Commands (continued)
Note:
Setting NAvg > 1 has a large effect on
battery endurance. See Sample Timing
and Battery Endurance in Section 2:
Description of MicroCAT.
The MicroCAT’s A/D converter is
factory-configured to take
4 measurements of the thermistor and
(optional) pressure sensor in rapid
succession and record the average
values; during this time the
conductivity measurement is also
integrated and the average is
recorded. This factory setting provides
the optimum trade-off between low
RMS noise and battery endurance;
additional averaging with NAvg is
usually unnecessary.
Note:
Do not send SampleNum=0 until all
data has been uploaded.
SampleNum=0 does not delete the
data; it just resets the data pointer. If
you accidentally send this
command before uploading, recover
the data as follows:
1. Set SampleNum=x, where x is
your estimate of number of samples
in memory.
2. Upload data. If x is more than actual
number of samples in memory, data for
non-existent samples will be bad,
random data. Review uploaded data file
carefully and delete any bad data.
3. If desired, increase x and upload data
again, to see if there is additional valid
data in memory.
NAvg=x
x= number of conductivity, temperature,
and (optional) pressure measurements
(1 – 1000) to take and average for each
sample. Default 1; Sea-Bird recommends
keeping NAvg=1.
PumpInstalled=x
x=N: Internal pump is not installed
(only valid setting for 37-SM).
x=Y: Not applicable to 37-SM.
SampleNum=x
x= sample number for first sample when
sampling begins. After all previous data
has been uploaded from MicroCAT, set
sample number to 0 before starting to
sample to make entire memory available
for recording. If not reset to 0, data will be
stored after last recorded sample.
QS
Quit session and place MicroCAT in
quiescent (sleep) state. Main power is
turned off. Data logging and memory
retention are not affected.
Autonomous Sampling (Logging) Commands
Note:
• If the MicroCAT is logging data and
the battery voltage is less than
6.15 volts for ten consecutive scans,
the MicroCAT halts logging and sets
the logging status to low battery.
• If the FLASH memory is filled to
capacity, sampling continues, but
excess data is not saved in memory
(i.e., the MicroCAT does not
overwrite the data in memory.
Logging commands direct the MicroCAT to sample data at pre-programmed
intervals and store the data in its FLASH memory.
Interval=x
x= interval (seconds) between samples
(5 - 32767). When commanded to start
sampling with StartNow or StartLater, at
x second intervals MicroCAT takes NAvg
measurements, stores averaged data in
FLASH memory, transmits real-time
averaged data (if TxRealTime=Y), and
goes to sleep.
Note:
StoreTime applies to autonomous
sampling only.
StoreTime=x
x=Y: Store date and time with each
sample. This adds 4 bytes per scan.
x=N: Do not.
29
Section 4: Deploying and Operating MicroCAT
Autonomous Sampling (Logging) Commands (continued)
Notes:
• TxRealTime applies to autonomous
sampling only.
• TxRealTime does not affect storing
data to memory, but slightly
increases current consumption and
time needed to sample (and then
transmit) data.
• To capture real-time data to a file, do
the following before starting logging:
1. Click Capture on the Toolbar.
2. Enter the desired file name in the
dialog box. The capture status
displays in the status bar at the
bottom of the screen.
Notes:
• StartDDMMYY= and
StartMMDDYY= are equivalent.
Either can be used to set the
delayed start date.
• After receiving StartLater, the
MicroCAT displays not logging:
waiting to start in reply to the
Display Status (DS) command. Once
logging has started, the DS reply
displays logging data.
• If the delayed start date and time
has already passed when StartLater
is received, the MicroCAT executes
StartNow.
TxRealTime=x
x=Y: Output real-time data. Averaged data
is transmitted immediately after it is
sampled. If outputting real-time data,
do not set Interval < 10 seconds if
NAvg=1; for larger values of NAvg
increase Interval (see Sample Timing in
Section 2: Description of MicroCAT).
x=N: Do not.
StartNow
Start logging now, at rate defined by
Interval. Data is stored in FLASH
memory. Data is transmitted real-time if
TxRealTime=Y.
StartMMDDYY=mmddyy
Set delayed logging start month, day, year.
Must be followed by StartHHMMSS= to
set delayed start time.
StartDDMMYY=ddmmyy
Set delayed logging start day, month, year.
Must be followed by StartHHMMSS= to
set delayed start time.
StartHHMMSS=hhmmss
Set delayed logging start hour, minute, second.
StartLater
Start logging at time set with delayed start
date and time commands, at rate defined
by Interval. Data is stored in FLASH
memory. Data is transmitted real-time if
TxRealTime=Y.
Example: Program MicroCAT to start logging on 20 July 2004 12:00:00 (user input in bold).
S>STARTMMDDYY=072004
S>STARTHHMMSS=120000
S>STARTLATER
or
S>STARTDDMMYY=200704
S>STARTHHMMSS=120000
S>STARTLATER
Note:
You may need to send Stop several
times to get the MicroCAT to respond.
This is most likely to occur if sampling
with a small Interval and transmitting
real-time data (TxRealTime=Y).
Stop
Stop logging (that was started with
StartNow or StartLater) or stop waiting
to start logging (if StartLater was sent but
logging has not begun yet). Press Enter
key to get S> prompt before entering
Stop. Stop must be sent before uploading
data using Upload on Toolbar, Upload
Data in Data menu, or DDb,e.
30
Section 4: Deploying and Operating MicroCAT
Polled Sampling Commands
Note:
The MicroCAT has a buffer that
stores the most recent data sample.
Unlike data in the FLASH memory,
data in the buffer is erased upon
removal or failure of power.
On command, the MicroCAT takes NAvg measurements, which are averaged
and stored in the buffer. To interrupt taking a sample, press the Esc key.
TS
Take sample, output converted averaged
data, and leave power on. Data is not
stored in FLASH memory.
TSR
Take sample, output averaged raw data,
and leave power on. Data is not stored in
FLASH memory.
TSS
Take sample, store averaged data in
FLASH memory, output converted
averaged data, and turn power off. If
MicroCAT is logging or waiting to log
when TSS is sent, MicroCAT executes
TS instead.
TSSOn
Take sample, store averaged data in
FLASH memory, output converted
averaged data, and leave power on. If
MicroCAT is logging or waiting to log
when TSSOn is sent, MicroCAT executes
TS instead.
SLT
Output converted averaged data from
last sample, then take new sample, and
leave power on. Data is not stored in
FLASH memory.
SLTR
Output raw averaged data from last
sample, then take new sample, and
leave power on. Data is not stored in
FLASH memory.
SL
Output converted averaged data from last
sample taken with polled or autonomous
sampling, and leave power on.
Serial Line Sync Commands
SyncMode=x
Note:
See Sampling Modes above for
complete details on the operation of
serial line synchronization.
x=Y: Enable serial line synchronization.
When RS-232 RX line is high (3-10 VDC)
for 1 to 1000 milliseconds, MicroCAT
takes a sample consisting of NAvg
measurements, stores averaged data in
FLASH memory, transmits real-time
averaged data, and goes to sleep.
x=N: Disable serial line synchronization.
SyncWait=x
x= time (seconds) MicroCAT monitors
RS-232 line for commands after taking
sample in serial line sync mode.
Range 0 - 120 seconds; default 0.
31
Section 4: Deploying and Operating MicroCAT
Data Upload Command
Notes:
• To save data to a file, click
Capture on the Toolbar before
entering DDb,e.
• See Data Output Formats after
these Command Descriptions.
• Use Upload on the Toolbar or
Upload Data in the Data menu
to upload data that will be
processed by SBE Data
Processing. Manually entering
DDb,e does not produce data
with the required header
information and required format
for processing by our software.
This command is included here
for reference for users who are
writing their own software.
Send Stop before uploading data.
DDb,e
Upload data from scan b to scan e.
First sample is number 1.
As data is uploaded, screen first displays
start time =,
sample interval =, and
start sample number = .
These are start time, sample interval, and
starting sample number for last set of
logged data. This information can be
useful in determining what data to review.
Example: Upload samples 1 through 200 for MicroCAT to a file (user
input in bold).
(Click Capture on Toolbar and enter desired filename in dialog box.)
S>DD1,200
Testing Commands
Data obtained with these commands is not stored in FLASH memory.
TT
Measure temperature 100 times or until
Esc key is pressed, output converted data.
TC
Measure conductivity 100 times or until
Esc key is pressed, output converted data.
TP
Measure pressure 100 times or until Esc
key is pressed, output converted data.
TTR
Measure temperature 100 times or until
Esc key is pressed, output raw data.
TCR
Measure conductivity 100 times or until
Esc key is pressed, output raw data.
TPR
Measure pressure 100 times or until Esc
key is pressed, output raw data.
TR
Measure real-time clock frequency
30 times or until Esc key is pressed,
output data.
32
Section 4: Deploying and Operating MicroCAT
Calibration Coefficients Commands
Notes:
• Dates shown are when
calibrations were performed.
Calibration coefficients are
initially factory-set and should
agree with Calibration
Certificates shipped
with MicroCAT.
• See individual Coefficient
Commands below for definitions
of the data in the example.
DC
Display calibration coefficients.
Equivalent to Coefficients on Toolbar.
Example: Display coefficients for MicroCAT that does not have a
pressure sensor (user input in bold).
S>DC
SBE37-SM V 2.6 2165
temperature:
19-may-03
TA0 = -9.420702e-05
TA1 = 2.937924e-04
TA2 = -3.739471e-06
TA3 = 1.909551e-07
conductivity:
19-may-03
G =
-1.036689e+00
H =
1.444342e-01
I =
-3.112137e-04
J =
3.005941e-05
CPCOR =
-9.570001e-08
CTCOR =
3.250000e-06
WBOTC =
1.968100e-05
rtc:
11-apr-03
RTCA0 =
9.999782e-01
RTCA1 =
1.749351e-06
RTCA2 =
-3.497835e-08
The individual Coefficient Commands listed below are used to modify a
particular coefficient or date:
Note:
F = floating point number
S = string with no spaces
TCalDate=S
TA0=F
TA1=F
TA2=F
TA3=F
CalDate=S
CG=F
CH=F
CI=F
CJ=F
WBOTC=F
CTCOR=F
CPCOR=F
PCalDate=S
PA0=F
PA1=F
PA2=F
PTCA0=F
PTCA1=F
PTCA2=F
PTCB0=F
PTCB1=F
PTCB2=F
POffset=F
RCalDate=S
RTCA0=F
RTCA1=F
RTCA2=F
S=Temperature calibration date
F=Temperature A0
F=Temperature A1
F=Temperature A2
F=Temperature A3
S=Conductivity calibration date
F=Conductivity G
F=Conductivity H
F=Conductivity I
F=Conductivity J
F=Conductivity wbotc
F=Conductivity ctcor
F=Conductivity cpcor
S=Pressure calibration date
F=Pressure A0
F=Pressure A1
F=Pressure A2
F=Pressure ptca0
F=Pressure ptca1
F=Pressure ptca2
F=Pressure ptcb0
F=Pressure ptcb1
F=Pressure ptcb2
F=Pressure offset
S=Real-time clock calibration date
F=Real-time clock A0
F=Real-time clock A1
F=Real-time clock A2
33
Section 4: Deploying and Operating MicroCAT
Data Output Formats
Notes (for Format=1 or 2):
t = temperature (°C, ITS-90)
c = conductivity (S/m)
p = pressure (decibars); included only if
optional pressure sensor installed
s = salinity (psu); sent only if
OutputSal=Y.
v = sound velocity (m/sec); sent only if
OutputSV=Y.
dd mmm yyyy = day, month (Jan, Feb,
Mar, etc.), year
mm-dd-yyyy = month, day, year
hh:mm:ss = hour, minute, second.
Note that time is the time at the
start of the sample.
• There is a comma but no space
between temperature and
conductivity. All other data is
separated with a comma and space.
• Date and time are included with
autonomous sampling data only if
StoreTime=Y.
• When TxRealTime=Y, real-time
autonomous data transmitted to the
computer is preceded by a # sign
and a space.
• The MicroCAT’s pressure sensor is
an absolute sensor, so its raw output
includes the effect of atmospheric
pressure (14.7 psi). As shown on the
Calibration Sheet, Sea-Bird’s
calibration (and resulting calibration
coefficients) is in terms of psia.
However, when outputting pressure
in decibars, the MicroCAT outputs
pressure relative to the ocean
surface (i.e., at the surface the
output pressure is 0 decibars).
The MicroCAT uses the following
equation to convert psia to decibars:
pressure (db) =
[pressure (psia) - 14.7] * 0.689476
Each scan ends with a carriage return <CR> and line feed <LF>.
•
Format=0
Raw hex data, intended only for diagnostic use at Sea-Bird.
•
Format=1 (default)
ttt.tttt,cc.ccccc, pppp.ppp, sss.ssss, vvvv.vvv, dd mmm yyyy, hh:mm:ss
Leading zeros are suppressed, except for one zero to the left of the
decimal point.
•
Format=2
ttt.tttt,cc.ccccc, pppp.ppp, sss.ssss, vvvv.vvv, mm-dd-yyyy, hh:mm:ss
Leading zeros are suppressed, except for one zero to the left of the
decimal point.
Example: Sample data output when pressure sensor is installed,
StoreTime=Y, OutputSal=Y, OutputSV=Y, and Format=1:
4.1960,
3.53255,
2184.494,
07 Nov 2004, 14:28:00
36.9305,
1506.185,
(temperature,conductivity, pressure, salinity, sound velocity, date, time)
34
Section 4: Deploying and Operating MicroCAT
Setup for Deployment
1.
Install new batteries (see Section 5: Routine Maintenance and
Calibration) or ensure the existing battery pack has enough capacity to
cover the intended deployment..
2.
Program the MicroCAT for the intended deployment (see Section 3:
Preparing MicroCAT for Deployment for connection information; see
information in this section on commands and sampling modes):
A. Ensure all data has been uploaded, and then set SampleNum=0 to
make the entire memory available for recording. If SampleNum is
not reset to 0, data will be stored after the last recorded sample.
B. Set the date and then time.
Notes:
• If the battery pack has been
removed, the date and time must
be reset.
• Always set date and then time. If
a new date is entered but not a
new time, the new date will not be
saved. If a new time is entered
without first entering a new date,
the date will reset to the last date it
was set for with MMDDYY=
or DDMMYY=.
C. Establish the setup and logging parameters.
D. Use one of the following command sequences to initiate sampling:
• StartNow to start logging now, taking a sample consisting of
NAvg measurements every Interval seconds.
• StartMMDDYY=, StartHHMMSS=, and StartLater to start
logging at the specified date and time, taking a sample consisting
of NAvg measurements every Interval seconds.
• SyncMode=Y to place the MicroCAT in serial line sync mode,
so that a simple pulse on the RS-232 line will initiate a sample
consisting of NAvg measurements.
35
Section 4: Deploying and Operating MicroCAT
Deployment
The MicroCAT comes standard with a pre-installed Sea-Bird wire mounting
clamp and guide.
Remove
plugs (2)
1.
New MicroCATs are shipped with AF24173 Anti-Foulant Devices and
protective plugs pre-installed.
A. Remove the protective plugs, if installed, from the anti-foulant device
cups. The protective plugs must be removed prior to deployment
or pressurization. If the plugs are left in place during deployment,
the sensor will not register conductivity. If left in place during
pressurization, the cell may be destroyed.
B. Verify that the anti-foulant device cups contain AF24173
Anti-Foulant Devices (see Section 5: Routine Maintenance
and Calibration).
2.
Install the dummy plug or I/O cable (for optional external power and/or
serial communication during deployment):
A. Lightly lubricate the inside of the dummy plug or cable connector
with silicone grease (DC-4 or equivalent).
B. Standard Connector (shown in photos) - Install the dummy plug or
cable connector, aligning the raised bump on the side of the
plug/connector with the large pin (pin 1 - ground) on the MicroCAT.
Remove any trapped air by burping or gently squeezing the
plug/connector near the top and moving your fingers toward the
end cap. OR
MCBH Connector – Install the plug/cable connector, aligning
the pins.
C. Place the locking sleeve over the plug/connector. Tighten the locking
sleeve finger tight only. Do not overtighten the locking sleeve and
do not use a wrench or pliers.
3.
Attach the mounting clamp and guide to the mooring cable.
4.
Verify that the hardware and external fittings are secure.
5.
Deploy the MicroCAT.
Antifoulant
device
cups (2)
CAUTION:
Do not use WD-40 or other
petroleum-based lubricants, as
they will damage the connectors.
Dummy plug or I/O cable connector
(as applicable)
Locking
sleeve
Standard mounting
clamp and guide –
loosen hardware to
separate clamp/guide
halves and mount on
mooring cable
36
Section 4: Deploying and Operating MicroCAT
Recovery
WARNING!
If the MicroCAT stops working while
underwater, is unresponsive to
commands, or shows other signs of
flooding or damage, carefully
secure it away from people until you
have determined that abnormal
internal pressure does not exist or
has been relieved. Pressure housings
may flood under pressure due to dirty
or damaged o-rings, or other failed
seals. When a sealed pressure
housing floods at great depths and is
subsequently raised to the surface,
water may be trapped at the pressure
at which it entered the housing,
presenting a danger if the housing is
opened before relieving the internal
pressure. Instances of such flooding
are rare. However, a housing that
floods at 5000 meters depth holds
an internal pressure of more than
7000 psia, and has the potential to
eject the end cap with lethal force.
A housing that floods at 50 meters
holds an internal pressure of more
then 85 psia; this force could still
cause injury.
If you suspect the MicroCAT is
flooded, point it in a safe direction
away from people, and loosen the
bulkhead connector very slowly, at
least 1 turn. This opens an o-ring seal
under the connector. Look for signs of
internal pressure (hissing or water
leak). If internal pressure is detected,
let it bleed off slowly past the
connector o-ring. Then, you can safely
remove the end cap.
Physical Handling
1.
Rinse the conductivity cell with fresh water. (See Section 5: Routine
Maintenance and Calibration for cell cleaning and storage.)
2.
Reinsert the protective plugs in the anti-foulant device cups.
3.
If the batteries are exhausted, new batteries must be installed before the
data can be extracted. Stored data will not be lost as a result of exhaustion
or removal of batteries, but the current date and time will have to be
re-entered upon redeployment. (See Section 5: Routine Maintenance and
Calibration for replacement of batteries.)
4.
If immediate redeployment is not required, it is best to leave the
MicroCAT with batteries in place and in a quiescent state (QS), so that
date and time are retained. Because the quiescent current required is only
10 microamps, the batteries can be left in place without significant loss of
capacity (less than 2% loss per year).
37
Section 4: Deploying and Operating MicroCAT
Uploading Data
Note:
Data may be uploaded during
deployment or after recovery. If
uploading after recovery, connect
the I/O cable as described in Power
and Communications Test in
Section 3: Preparing MicroCAT
for Deployment.
1.
Double click on SeaTerm.exe. The display shows the main screen.
2.
In the Configure menu, select SBE 37. Click on the Upload Settings tab.
The dialog box looks like this:
Baud rate for uploading data from
MicroCAT to computer is same
as baud rate for general
communication, which was set
on COM Settings tab.
Defines data upload type when
using Upload button on Toolbar or
Upload Data in Data menu:
• All as single file – All data
uploaded into one file.
• By scan number range –
SEATERM prompts for beginning
and ending scan (sample)
numbers, and uploads all data
within range into one file.
Note:
Set up Upload Settings, Header
Information, and/or Header Form
(Steps 2 through 4):
• The first time you upload data, and
• If you want to change upload or
header parameters.
Make the selection for Upload Settings.
3.
Click on the Header Information tab. The dialog box looks like this:
Defines header
information included with
uploaded data:
• Prompt for header
information – Each
time data is uploaded,
user is prompted to fill
out user-defined
header form.
• Include default header
form in upload file –
User-defined default
header form included in
upload file. User is not
prompted to add any
information when data
is uploaded.
• Do not include default
header form in upload
file – Header
information not
included in upload file.
Select the desired header information option. Click OK to save
the settings.
38
Section 4: Deploying and Operating MicroCAT
4.
In the Configure menu, select Header Form to customize the header.
The dialog box looks like this (default prompts are shown):
The entries are free form, 0 to 12 lines long. This dialog box establishes:
• header prompts that appear for the user to fill in when uploading data,
if Prompt for header information was selected in the Configuration
Options dialog box (Step 3)
• header included with the uploaded data, if Include default header
form in upload file was selected in the Configuration Options dialog
box (Step 3)
Enter the desired header/header prompts. Click OK.
Note:
You may need to send Stop
several times to get the MicroCAT
to respond.
5.
Click Connect on the Toolbar to begin communications with the
MicroCAT. The display looks like this:
. . . Communication Established
S>
This shows that correct communications between the computer and the
MicroCAT has been established.
If the system does not respond as shown above:
• Click Connect again.
• Check cabling between the computer and MicroCAT.
• Verify the correct instrument was selected and the COM settings
were entered correctly in the Configure menu.
6.
If sampling autonomously, command the MicroCAT to stop logging by
pressing the Enter key and sending Stop.
39
Section 4: Deploying and Operating MicroCAT
7.
Display MicroCAT status information by clicking Status on the Toolbar.
The display looks like this:
SBE37-SM V 2.6 SERIAL NO. 2165 20 Nov 2004 08:49:08
not logging: received stop command
sample interval = 30 seconds
samplenumber = 52, free = 190598
do not transmit real-time data
do not output salinity with each sample
do not output sound velocity with each sample
store time with each sample
number of samples to average = 1
serial sync mode disabled
wait time after serial sync sampling = 120 seconds
internal pump not installed
temperature = 7.54 deg C
8.
Click Upload on the Toolbar to upload stored data. SEATERM responds
as follows:
A. SEATERM sends the status command (DS), displays the response,
and writes the command and response to the upload file. This
provides you with information regarding the number of samples
in memory.
B. If you selected By scan number range in the Configuration
Options dialog box (Configure menu) – a dialog box requests the
range. Enter the desired value(s), and click OK.
C. SEATERM sends the calibration coefficients command (DC),
displays the response, and writes the command and response
to the upload file. This displays the calibration coefficients.
D. If you selected Prompt for header information in the
Configuration Options dialog box (Configure menu) – a dialog
box with the header form appears. Enter the desired header
information, and click OK.
E. In the Open dialog box, enter the desired upload file name and
click OK. The upload file has a .asc extension.
F. SEATERM sends the data upload (DDb,e) command.
G. When the data has been uploaded, SEATERM shows the S> prompt.
40
Section 4: Deploying and Operating MicroCAT
9.
Ensure all data has been uploaded from the MicroCAT by reviewing
the data:
A. SEATERM contains a utility to convert the .asc file to a .cnv file
that can be used by SBE Data Processing. To convert the data:
1) In SEATERM, click Convert on the Toolbar. The Convert dialog
box appears.
2) In the dialog box, enter the input (.asc) file name and the desired
output (.cnv) file name; file names must include the path.
3) If desired, click Start new year at Julian time 0 to reset the Julian
Day to 0 on January 1. Date and time (if present in the uploaded
file) is converted to Julian Day with five significant digits. As the
default, Convert does not reset the Julian Day to 0 when rolling
Notes:
over from December 31 to January 1.
• The entered deployment pressure can differ
4) If desired, click Insert deployment pressure. A field for the
from the reference pressure entered prior to
deployment pressure appears in the dialog box; enter the pressure
deployment using RefPress=. Pressure, used
(in decibars) at which the MicroCAT was deployed. Convert
internally by the MicroCAT to calculate
adds a pressure column to the data; the entered deployment
conductivity, has only a small effect on
pressure is inserted in every row of the pressure column in the
conductivity. However, pressure has a larger
output .cnv file.
effect on the salinity calculation (performed in
SBE Data Processing’s Derive module).
Entering the deployment pressure when
converting the data allows you to provide
more accurate pressure information than may
have been available prior to deployment, for
calculation of salinity and other parameters in
SBE Data Processing.
• If your MicroCAT includes an optional
pressure sensor, entering a deployment
pressure has no effect on the data. Convert
does not overwrite the actual pressure
data in the file with the entered deployment
pressure.
B.
Notes:
To prepare for re-deployment:
1. After all data has been uploaded, send
SampleNum=0. If this is not sent, new
data will be stored after the last recorded
sample, preventing use of the entire
memory capacity.
2. Do one of the following:
• Send QS to put the MicroCAT in
quiescent (sleep) state until ready to
redeploy. Leaving the MicroCAT with the
batteries in place and in quiescent state
retains the date and time. Quiescent
current is only 10 microamps, so the
batteries can be left in place without
significant loss of capacity.
• Use StartNow to begin logging
immediately.
• Set a date and time for logging to
start using StartMMDDYY= or
StartDDMMYY=, StartHHMMSS=,
and StartLater.
Use SBE Data Processing’s Derive module to compute salinity,
density, and other parameters. See the software manual on CD-ROM
or Help files for complete details.
1) Derive will require you to select an instrument configuration
(.con) file before it processes data. A MicroCAT does not have a
.con file, but you can use a .con file from any other Sea-Bird
instrument; the contents of the .con file will not affect the results.
If you do not have a .con file for another Sea-Bird instrument,
create one by clicking SBE Data Processing’s Configure menu
and selecting any instrument. In the Configuration dialog box,
click Save As, and save the .con file with the desired name and
location; for ease of use, save the file with the same name and to
the same directory as your .cnv file (for example, save the .con
file for test.cnv as test.con).
2) In SBE Data Processing’s Run menu, select Derive.
3) In the Derive dialog box, click on the File Setup tab.
Select the instrument configuration (.con) file from Step 9B1.
Select the .cnv file you created in Step 9A.
4) Click on the Data Setup tab, and click Select Derived Variables.
Select the desired output variables, and click OK. Then click
Start Process. Derive will output a .cnv file which includes all the
data in the input .cnv file as well as the desired derived variables.
C. Use SBE Data Processing’s SeaPlot module to plot the data.
41
Section 5: Routine Maintenance and Calibration
Section 5: Routine Maintenance
and Calibration
This section reviews corrosion precautions, connector mating and
maintenance, conductivity cell cleaning and storage, pressure sensor
maintenance, plastic housing handling instructions, replacement of batteries,
replacement of AF24173 Anti-Foulant Devices, and sensor calibration. The
accuracy of the MicroCAT is sustained by the care and calibration of the
sensors and by establishing proper handling practices.
Corrosion Precautions
Rinse the MicroCAT with fresh water after use and prior to storage.
All exposed metal is titanium; other materials are plastic. No corrosion
precautions are required, but direct electrical connection of the MicroCAT
housing to mooring or other dissimilar metal hardware should be avoided.
Connector Mating and Maintenance
A mated connector does not require periodic disassembly or other attention.
Inspect a connector that is unmated for signs of corrosion product around the
pins. When remating:
CAUTION:
Do not use WD-40 or other
petroleum-based
lubricants, as they will
damage the connectors.
1.
Lightly lubricate the inside of the dummy plug/cable connector with
silicone grease (DC-4 or equivalent).
2.
Standard Connector - Install the plug/cable connector, aligning the
raised bump on the side of the plug/cable connector with the large pin
(pin 1 - ground) on the MicroCAT. Remove any trapped air by burping or
gently squeezing the plug/connector near the top and moving your fingers
toward the end cap. OR
MCBH Connector – Install the plug/cable connector, aligning the pins.
3.
Place the locking sleeve over the plug/cable connector. Tighten the
locking sleeve finger tight only. Do not overtighten the locking sleeve
and do not use a wrench or pliers.
Verify that a cable or dummy plug is installed on the MicroCAT
before deployment.
42
Section 5: Routine Maintenance and Calibration
Conductivity Cell Maintenance
CAUTIONS:
• Do not put a brush or any object
inside the conductivity cell to
clean it. Touching and bending
the electrodes can change the
calibration. Large bends and
movement of the electrodes can
damage the cell.
• Do not store the MicroCAT with
water in the conductivity cell.
Freezing temperatures (for
example, in Arctic environments or
during air shipment) can break the
conductivity cell if it is full of water.
Remove
plug
Unscrew cap, and
replace with barbed
cap for cleaning
and storage
The MicroCAT’s conductivity cell is shipped dry to prevent freezing in
shipping. Refer to Application Note 2D: Instructions for Care and Cleaning
of Conductivity Cells for conductivity cell cleaning procedures and
cleaning materials.
• The Active Use (after each cast) section of the application note
is not applicable to the MicroCAT, which is intended for use as a
moored instrument.
A conductivity cell filling and storage kit is available from Sea-Bird. The kit
(PN 50087.1) includes a syringe and tubing assembly, and two anti-foulant
device caps with hose barbs. The tubing cannot attach to an anti-foulant device
cap that is not barbed.
Cleaning and storage instructions require use of the syringe and tubing
assembly at the intake end of the cell (requiring one barbed cap), and looping
Tygon tubing from end to end of the cell (requiring two barbed caps). Remove
the installed anti-foulant device cap(s) and replace them with the anti-foulant
device cap(s) with hose barbs for cleaning and storage only. Remember to
reinstall the original anti-foulant device cap(s) before deployment. Deploying
a MicroCAT with barbed anti-foulant device cap(s) in place of the
installed caps is likely to produce undesirable results in your data. See
Replacing Anti-Foulant Devices for safety precautions when handling the
AF24173 Anti-Foulant Devices.
Barbed caps for
cleaning and storage
Pressure Sensor (optional) Maintenance
The pressure port plug has a small vent hole to allow hydrostatic pressure to be
transmitted to the pressure sensor inside the instrument, while providing
protection for the pressure sensor, keeping most particles and debris out of the
pressure port.
Periodically (approximately once a year) inspect the pressure port to remove
any particles, debris, etc:
Pressure sensor port plug
CAUTION:
Do not put a brush or any object in
the pressure port. Doing so may
damage or break the pressure sensor.
1.
Unscrew the pressure port plug from the pressure port.
2.
Rinse the pressure port with warm, de-ionized water to remove any
particles, debris, etc.
3.
Replace the pressure port plug.
43
Section 5: Routine Maintenance and Calibration
Handling Instructions for Plastic ShallowCAT Option
The MicroCAT’s standard 7000-meter titanium housing offers the best
durability with a modest amount of care. The ShallowCAT option, substitution
of a 250-meter plastic housing, saves money and weight. However, more care
and caution in handling is required. To get the same excellent performance and
longevity for the plastic-housing version:
•
See detail
below
The MicroCAT’s battery end cap is retained by two screws through the
side of the housing. The screw holes are close to the end of the housing.
Particularly in a cold environment, where plastic is more brittle, the
potential for developing a crack around the screw hole(s) is greater for the
plastic housing than for the titanium housing. Observe the following
precautions –
¾
¾
Screw securing battery/connector
end cap (one each side)
•
When removing the end cap (to replace the batteries and/or to access
the electronics), be careful to avoid any impact in this area of the
housing.
When reinstalling the end cap, do not use excess torque on the
screws. Sea-Bird recommends tightening the screws to 15 inch-lbs.
Alternatively, tighten the screws finger-tight, and then turn each
screw an additional 45 degrees.
A plastic housing is more susceptible to scratches than a titanium housing.
Do not use screwdrivers or other metal tools to pry off the end cap.
¾
¾
¾
Of primary concern are scratches on O-ring mating and sealing
surfaces. Take extra precaution to avoid a scraping contact with these
surfaces when replacing batteries and/or re-seating the end cap.
Also take care to keep the O-ring lubricated surfaces clean – avoid
trapping any sand or fine grit that can scratch the critical sealing
surfaces. If the O-ring lubricant does accumulate any material or grit
that can cause a leak or make a scratch, it must be carefully cleaned
and replaced with fresh, clean lubricant (Parker Super O Lube).
Shallow, external scratches are cosmetic only, and will not affect the
performance of the MicroCAT. However, deep external scratches can
become points of weakness for deep deployments or fracture from
impact during very cold weather.
Detail - Battery/connector end cap
•
If you remove the screws securing the conductivity cell guard to the
housing (not typically done by the customer), follow the same precautions
as described above for removing and replacing the battery end cap.
See Battery Installation in Section 3: Preparing MicroCAT for Deployment
and Appendix II: Electronics Disassembly / Reassembly for detailed step-bystep procedures for removing the MicroCAT’s end cap.
44
Section 5: Routine Maintenance and Calibration
Replacing Batteries
See Installing Batteries in Section 3: Preparing MicroCAT for Deployment.
1.
Remove the I/O connector end cap and battery pack assembly.
2.
Remove the upper PCB from the assembly as follows:
A. Remove the two small Phillips-head screws and lock washers from
the upper PCB.
B. Carefully pry the upper PCB away from the batteries, gently going
around the circle of batteries to avoid bending the banana plugs.
3.
Remove the existing batteries and replace with new batteries, banana plug
end (+) first. Ensure each battery is fully inserted.
4.
Reinstall the upper PCB, replace the battery pack assembly, and reinstall
the end cap.
45
Section 5: Routine Maintenance and Calibration
Replacing Anti-Foulant Devices (SBE 37-SI, SM, IM)
The MicroCAT has an anti-foulant device cup and cap on each end of the cell.
New MicroCATs are shipped with an Anti-Foulant Device and a protective
plug pre-installed in each cup.
AF24173
Anti-Foulant
Device
Wearing rubber or latex gloves, follow this procedure to replace each AntiFoulant Device (two):
WARNING!
AF24173 Anti-Foulant Devices
contain bis(tributyltin) oxide.
Handle the devices only with
rubber or latex gloves. Wear eye
protection. Wash with soap and
water after handling.
1.
Remove the protective plug from the anti-foulant device cup;
2.
Unscrew the cap with a 5/8-inch socket wrench;
3.
Remove the old Anti-Foulant Device. If the old device is difficult
to remove:
Read precautionary information on
product label (see Appendix IV)
before proceeding.
It is a violation of US Federal Law
to use this product in a manner
inconsistent with its labeling.
Cup
Cap
Plug
Cap
Cup
•
Use needle-nose pliers and carefully break up material;
•
If necessary, remove the guard to provide easier access.
Place the new Anti-Foulant Device in the cup;
4.
Rethread the cap onto the cup. Do not over tighten;
5.
If the MicroCAT is to be stored, reinstall the protective plug. Note that
the plugs must be removed prior to deployment or pressurization.
If the plugs are left in place during deployment, the cell will not
register conductivity. If left in place during pressurization, the cell
may be destroyed.
CAUTION:
Anti-foulant device cups are attached to the
guard and connected with tubing to the cell.
Removing the guard without
disconnecting the cups from the guard
will break the cell. If the guard must be
removed:
1. Remove the two screws connecting
each anti-foulant device cup to the
guard.
2. Remove the four Phillips-head screws
connecting the guard to the housing
and sensor end cap.
3. Gently lift the guard away.
46
Section 5: Routine Maintenance and Calibration
Sensor Calibration
Notes:
• Batteries must be removed
before returning the MicroCAT to
Sea-Bird. Do not return used
batteries to Sea-Bird when
shipping the MicroCAT for
recalibration or repair.
• Please remove AF24173 AntiFoulant Devices from the antifoulant device cups before
returning the MicroCAT to SeaBird. Store them for future use.
See Replacing Anti-Foulant
Devices for removal procedure.
Sea-Bird sensors are calibrated by subjecting them to known physical
conditions and measuring the sensor responses. Coefficients are then
computed, which may be used with appropriate algorithms to obtain
engineering units. The conductivity and temperature sensors on the MicroCAT
are supplied fully calibrated, with coefficients printed on their respective
Calibration Certificates (see back of manual). These coefficients have been
stored in the MicroCAT’s EEPROM.
We recommend that MicroCATs be returned to Sea-Bird for calibration.
Conductivity Sensor Calibration
The conductivity sensor incorporates a fixed precision resistor in parallel with
the cell. When the cell is dry and in air, the sensor’s electrical circuitry outputs
a frequency representative of the fixed resistor. This frequency is recorded on
the Calibration Certificate and should remain stable (within 1 Hz) over time.
The primary mechanism for calibration drift in conductivity sensors is the
fouling of the cell by chemical or biological deposits. Fouling changes the cell
geometry, resulting in a shift in cell constant.
Accordingly, the most important determinant of long-term sensor accuracy is
the cleanliness of the cell. We recommend that the conductivity sensor be
calibrated before and after deployment, but particularly when the cell has been
exposed to contamination by oil slicks or biological material.
Temperature Sensor Calibration
The primary source of temperature sensor calibration drift is the aging of the
thermistor element. Sensor drift will usually be a few thousandths of a degree
during the first year, and less in subsequent intervals. Sensor drift is not
substantially dependent upon the environmental conditions of use, and —
unlike platinum or copper elements — the thermistor is insensitive
to shock.
47
Section 5: Routine Maintenance and Calibration
Pressure Sensor (optional) Calibration
The optional strain-gauge pressure sensor is a mechanical diaphragm type,
with an initial static error band of 0.05%. Consequently, the sensor is capable
of meeting the MicroCAT’s 0.10% error specification with some allowance
for aging and ambient-temperature induced drift.
Pressure sensors show most of their error as a linear offset from zero.
A technique is provided below for making small corrections to the pressure
sensor calibration using the offset (POffset=) calibration coefficient term by
comparing MicroCAT pressure output to readings from a barometer.
Note:
The MicroCAT’s pressure sensor is an
absolute sensor, so its raw output
(Format=0) includes the effect of
atmospheric pressure (14.7 psi). As
shown on the Calibration Sheet, SeaBird’s calibration (and resulting
calibration coefficients) is in terms of
psia. However, when outputting
pressure in engineering units, the
MicroCAT outputs pressure relative to
the ocean surface (i.e., at the surface
the output pressure is 0 decibars). The
MicroCAT uses the following equation
to convert psia to decibars:
Pressure (db) =
[pressure (psia) - 14.7] * 0.689476
Allow the MicroCAT to equilibrate in a reasonably constant temperature
environment for at least 5 hours before starting. Pressure sensors exhibit a
transient change in their output in response to changes in their environmental
temperature. Sea-Bird instruments are constructed to minimize this by thermally
decoupling the sensor from the body of the instrument. However, there is still
some residual effect; allowing the MicroCAT to equilibrate before starting will
provide the most accurate calibration correction.
1.
Place the MicroCAT in the orientation it will have when deployed.
2.
In SEATERM:
A. Set the pressure offset to 0.0 (POffset=0).
B. Send TP to measure the MicroCAT pressure 100 times and transmit
converted data (decibars).
3.
Compare the MicroCAT output to the reading from a good barometer at the
same elevation as the MicroCAT’s pressure sensor.
Calculate offset = barometer reading – MicroCAT reading
4.
Enter the calculated offset (positive or negative) in the MicroCAT’s
EEPROM, using POffset= in SEATERM.
Offset Correction Example
Absolute pressure measured by a barometer is 1010.50 mbar. Pressure displayed from MicroCAT is -2.5 dbars.
Convert barometer reading to dbars using the relationship: mbar * 0.01 = dbar
Barometer reading = 1010.50 mbar * 0.01 = 10.1050 dbar
The MicroCAT’s internal calculations output gage pressure, using an assumed value of 14.7 psi for atmospheric
pressure. Convert MicroCAT reading from gage to absolute by adding 14.7 psia to the MicroCAT’s output:
-2.5 dbars + (14.7 psi * 0.689476 dbar/psia) = -2.5 + 10.13 = 7.635 dbars
Offset = 10.1050 – 7.635 = + 2.47 dbars
Enter offset in MicroCAT.
For demanding applications, or where the sensor’s air ambient pressure
response has changed significantly, calibration using a dead-weight
generator is recommended. The pressure sensor port uses a 7/16-20 straight
thread for mechanical connection to the pressure source. Use a fitting that has
an O-ring tapered seal, such as Swagelok-200-1-4ST, which conforms to
MS16142 boss.
48
Section 6: Troubleshooting
Section 6: Troubleshooting
This section reviews common problems in operating the MicroCAT, and
provides the most common causes and solutions.
Problem 1: Unable to Communicate with MicroCAT
The S> prompt indicates that communications between the MicroCAT and
computer have been established. Before proceeding with troubleshooting,
attempt to establish communications again by clicking Connect on
SEATERM’s toolbar or pressing the Enter key several times.
Cause/Solution 1: The I/O cable connection may be loose. Check the cabling
between the MicroCAT and computer for a loose connection.
Cause/Solution 2: The instrument type and/or its communication settings may
not have been entered correctly in SEATERM. Select the SBE 37 in the
Configure menu and verify the settings in the Configuration Options dialog
box. The settings should match those on the instrument Configuration Sheet.
Cause/Solution 3: The I/O cable between the MicroCAT and computer may
not be the correct one. The I/O cable supplied with the MicroCAT permits
connection to standard 9-pin RS-232 interfaces.
Problem 2: No Data Recorded
Cause/Solution 1: The memory may be full; once the memory is full, no
further data will be recorded. Verify that the memory is not full using DS
(free = 0 or 1 if memory is full). Sea-Bird recommends that you upload all
previous data before beginning another deployment. Once the data is
uploaded, send SampleNum=0 to reset the memory. After the memory is
reset, DS will show samplenumber = 0.
Problem 3: Unreasonable T, C, or P Data
The symptom of this problem is a data file that contains unreasonable values
(for example, values that are outside the expected range of the data).
Cause/Solution 1: A data file with unreasonable (i.e., out of the expected
range) values for temperature, conductivity, or pressure may be caused by
incorrect calibration coefficients in the MicroCAT. Send DC to verify the
calibration coefficients in the MicroCAT match the instrument Calibration
Certificates. Note that calibration coefficients do not affect the raw data stored
in MicroCAT memory. If you have not yet overwritten the memory with new
data, you can correct the coefficients and then upload the data again.
49
Section 6: Troubleshooting
Problem 4: Salinity Spikes
Salinity is a function of conductivity, temperature, and pressure, and must be
calculated from C, T, and P measurements made on the same parcel of water.
Salinity is calculated and output by the 37-SM if OutputSal=Y. Alternatively,
salinity can be calculated in SBE Data Processing’s Derive module from the
data uploaded from memory (.cnv file).
[Background information: Salinity spikes in profiling (i.e., moving, fast
sampling) instruments typically result from misalignment of the temperature
and conductivity measurements in conditions with sharp gradients. This
misalignment is often caused by differences in response times for the
temperature and conductivity sensors, and can be corrected for in postprocessing if the T and C response times are known.]
In moored, free-flushing instruments such as the 37-SM MicroCAT, wave
action, mooring motion, and currents flush the conductivity cell at a faster rate
than the environment changes, so the T and C measurements stay closely
synchronized with the environment (i.e., even slow or varying response times
are not significant factors in the salinity calculation). More typical causes of
salinity spikes in a moored 37-SM include:
Cause/Solution 1: Severe external bio-fouling can restrict flow through the
conductivity cell to such an extent that the conductivity measurement is
significantly delayed from the temperature measurement.
Cause/Solution 2: For a MicroCAT moored at shallow depth, differential
solar heating can cause the actual temperature inside the conductivity cell to
differ from the temperature measured by the thermistor. Salinity spikes
associated mainly with daytime measurements during sunny conditions may
be caused by this phenomenon.
Cause/Solution 3: For a MicroCAT moored at shallow depth, air bubbles
from breaking waves or spontaneous formation in supersaturated conditions
can cause the conductivity cell to read low of correct.
50
Glossary
Glossary
Battery pack – Six 9-volt (nominal 1.2 amp-hour) batteries, each containing
lithium cells of the type commonly used in cameras. The battery pack also
includes two small PCBs and a brass sleeve.
Convert – Toolbar button in SEATERM to convert ASCII (.asc) data
uploaded with SEATERM to .cnv format. Once data is converted to .cnv
format, SBE Data Processing can be used to analyze and display data.
Fouling – Biological growth in the conductivity cell during deployment.
MicroCAT – High-accuracy conductivity, temperature, and optional pressure
recorder. A number of models are available:
• SBE 37-IM (Inductive Modem, internal battery and memory)
• SBE 37-IMP (Inductive Modem, internal battery and memory,
integral Pump)
• SBE 37-SM (Serial interface, internal battery and Memory)
• SBE 37-SMP (Serial interface, internal battery and Memory,
integral Pump)
• SBE 37-SI (Serial Interface only, no internal battery or memory)
• SBE 37-SIP (Serial Interface only, no internal battery or memory,
integral Pump)
The –SM, -SMP, -SI, and -SIP are available with RS-232 (standard) or
RS-485 (optional) interface.
PCB – Printed Circuit Board.
SBE Data Processing - Sea-Bird’s Win 2000/XP data processing software,
which calculates and plots temperature, conductivity, and optional pressure,
and derives variables such as salinity and sound velocity.
Scan – One data sample (consisting of NAvg averaged measurements)
containing temperature, conductivity, optional pressure, and optional date
and time, as well as optional derived variables (salinity and sound velocity).
SEASOFT-Win32 – Sea-Bird’s complete Win 2000/XP software package,
which includes software for communication, real-time data acquisition, and
data analysis and display. SEASOFT-Win32 includes SEATERM and SBE
Data Processing.
SEATERM – Sea-Bird’s Win 95/98/NT/2000/XP software used to
communicate with the MicroCAT.
Super O-Lube – Silicone lubricant used to lubricate O-rings and O-ring
mating surfaces. Super O-Lube can be ordered from Sea-Bird, but should also
be available locally from distributors. Super O-Lube is manufactured by
Parker Hannifin; see http://www.parker.com/ead/cm2.asp?cmid=3956 for
details.
TCXO – Temperature Compensated Crystal Oscillator.
Triton X-100 – Reagent grade non-ionic surfactant (detergent), used for
cleaning the conductivity cell. Triton can be ordered from Sea-Bird,
but should also be available locally from chemical supply or laboratory
products companies. Triton is manufactured by Mallinckrodt Baker
(see http://www.mallbaker.com/changecountry.asp?back=/Default.asp
for local distributors).
51
Appendix I: Functional Description
Appendix I: Functional Description
Sensors
The MicroCAT embodies the same sensor elements (3-electrode, 2-terminal,
borosilicate glass cell, and pressure-protected thermistor) previously
employed in Sea-Bird’s modular SBE 3 and SBE 4 sensors and in Sea-Bird’s
SEACAT family.
Note:
Pressure ranges are expressed
in meters of deployment
depth capability.
The MicroCAT’s optional pressure sensor, developed by Druck, Inc., has a
superior new design that is entirely different from conventional ‘silicon’ types
in which the deflection of a metallic diaphragm is detected by epoxy-bonded
silicon strain gauges. The Druck sensor employs a micro-machined silicon
diaphragm into which the strain elements are implanted using semiconductor
fabrication techniques. Unlike metal diaphragms, silicon’s crystal structure is
perfectly elastic, so the sensor is essentially free of pressure hysteresis.
Compensation of the temperature influence on pressure offset and scale is
performed by the MicroCAT’s CPU. The pressure sensor is available in the
following pressure ranges: 20, 100, 350, 600, 1000, 2000, 3500, and
7000 meters.
Sensor Interface
Temperature is acquired by applying an AC excitation to a hermetically sealed
VISHAY reference resistor and an ultra-stable aged thermistor with a drift rate
of less than 0.002°C per year. A 24-bit A/D converter digitizes the outputs of
the reference resistor and thermistor (and optional pressure sensor).
AC excitation and ratiometric comparison using a common processing channel
avoids errors caused by parasitic thermocouples, offset voltages, leakage
currents, and reference errors.
Conductivity is acquired using an ultra-precision Wien Bridge oscillator to
generate a frequency output in response to changes in conductivity. A highstability TCXO reference crystal with a drift rate of less than 2 ppm/year is
used to count the frequency from the oscillator.
Real-Time Clock
To minimize battery current drain, a low power watch crystal is used as the
real-time-clock frequency source. Initial error and ambient temperatureinduced drift are compensated by measuring its actual frequency against the
TCXO each time a reading of temperature and conductivity is made during
calibration. The measured discrepancy (if any) is used to arithmetically correct
the low power clock during normal operation.
52
Appendix II: Electronics Disassembly/Reassembly
Appendix II: Electronics
Disassembly/Reassembly
Disassembly
CAUTION:
See Section 5: Routine Maintenance
and Calibration for handling
instructions for the plastic
ShallowCAT housing.
1.
Remove the end cap and battery pack following instructions in
Section 3: Preparing MicroCAT for Deployment. Do not remove the
titanium guard!
2.
The electronics are on a sandwich of three rectangular PCBs. These PCBs
are assembled to a bulkhead that can be seen at the bottom of the battery
compartment. To remove the PCB assembly:
A. Use a long screwdriver (#1 screwdriver) to remove the Phillips-head
screw at the bottom of the battery compartment. The Phillips-head
screw is a 198 mm (7.8 inch) threaded rod with Phillips-head.
B. Pull out the PCB assembly using the PVC pylon (post with Molex
connector). The assembly will pull away from the 10-position edge
connector used to connect to the sensors.
1.
Sight down into the MicroCAT housing to find the hole into which the
Phillips-head screw threads. The hole is at the bottom of the housing, next
to the edge connector. The small-diameter brass sleeve between two of the
PCBs guides the screw into the hole. Align this sleeve with the hole.
2.
Guide the PCB assembly into the housing and push the assembly until the
edge connector is fully inserted. A gentle resistance can be felt during the
last 3 mm (1/8 inch) of insertion as the PCB assembly mates to the
edge connector.
3.
Drop the Phillips-head screw into the hole and tighten gently.
4.
If it is difficult to align the cards, obtain a 305mm (12 inch) length of
6-32 threaded rod.
A. Thread the end of this rod into the hole at the bottom of the housing
(next to the edge connector).
B. Slide the PCB assembly’s small diameter brass sleeve down the rod.
The rod will help guide the assembly into the proper position.
C. Push the assembly until the edge connector is fully inserted.
After the PCB assembly has been fully inserted, remove the rod.
D. Drop the Phillips-head screw into the hole and tighten gently.
5.
Reinstall the battery pack and end cap following instructions in
Section 3: Preparing MicroCAT for Deployment.
Reassembly
Note:
If the rod will not tighten, the PCBs
have not fully mated or are mated
in reverse.
Note:
Before delivery, a desiccant package is
inserted in the housing and the
electronics chamber is filled with dry
Argon gas. These measures help
prevent condensation. To ensure
proper functioning:
1. Install a new desiccant bag each
time you open the electronics
chamber. If a new bag is not
available, see Application
Note 71: Desiccant Use and
Regeneration (drying).
2. If possible, dry gas backfill each
time you open the housing. If you
cannot, wait at least 24 hours
before redeploying, to allow the
desiccant to remove any moisture
from the housing.
Note that opening the battery
compartment does not affect
desiccation of the electronics.
53
Appendix III: Command Summary
Appendix III: Command Summary
CATEGORY
Note:
See Command
Descriptions in
Section 4: Deploying
and Operating
MicroCAT for
detailed information
and examples.
Note:
Do not set Interval to less
than 10 seconds if
transmitting real-time data
(TxRealTime=Y).
COMMAND
DESCRIPTION
Display status.
Status
DS
Set real-time clock month, day, year.
MMDDYY=mmddyy Follow with HHMMSS= or it will not set date.
Set real-time clock day, month, year.
DDMMYY=ddmmyy Follow with HHMMSS= or it will not set date.
HHMMSS=hhmmss Set real-time clock hour, minute, second.
x= baud rate (600, 1200, 2400, 4800, 9600, 19200,
Baud=x
or 38400). Default 9600.
x=Y: calculate and output salinity (psu) with each
sample.
OutputSal=x
x=N: do not.
x=Y: calculate and output sound velocity (m/sec) with
each sample.
OutputSV=x
x=N: do not.
x=0: output raw hex data, for diagnostic use
x=1: output converted data, date dd mmm yyyy
Format=x
Setup
x=2: output converted data, date mm-dd-yyyy
x= reference pressure (gauge) in decibars (used for
conductivity computation when MicroCAT does not
RefPress=x
have pressure sensor).
x= number of measurements (1 – 1000) to take and
average per sample. Default 1; larger values have a
NAvg=x
large impact on battery endurance.
x=N: Internal pump is not installed
PumpInstalled=x
(only valid setting for 37-SM).
x= sample number for first sample when sampling
begins. After all previous data has been uploaded, set
to 0 before starting to sample to make entire memory
SampleNum=x
available for recording. If not reset to 0, data stored
after last sample.
Enter quiescent (sleep) state. Main power turned off,
QS
but data logging and memory retention unaffected.
x= interval (seconds) between samples (5 - 32767).
When commanded to start sampling with StartNow or
StartLater, at x second intervals MicroCAT takes
Interval=x
sample consisting of NAvg measurements, stores
averaged data in FLASH memory, transmits real-time
averaged data (if TxRealTime=Y), and goes to sleep.
x=Y: store date and time with each sample.
StoreTime=x
x=N: do not.
x=Y: output real-time averaged data.
TxRealTime=x
x=N: do not.
Autonomous
Start logging now.
StartNow
Sampling
StartMMDDYY=
Delayed logging start: month, day, year.
(Logging)
Must follow with StartHHMMSS=.
mmddyy
StartDDMMYY= Delayed logging start: day, month, year.
Must follow with StartHHMMSS=.
ddmmyy
StartHHMMSS=
hhmmss
StartLater
Stop
54
Delayed logging start: hour, minute, second.
Start logging at delayed logging start time.
Stop logging or stop waiting to start logging. Press
Enter key to get S> prompt before entering Stop.
Must send Stop before uploading data.
Appendix III: Command Summary
CATEGORY
COMMAND
TS
TSR
Polled
(All samples
consist of NAvg
measurements;
averaged data is
stored and/or
output as
applicable.)
TSS
TSSOn
SLT
SLTR
SL
SyncMode=x
Serial Line
Sync
SyncWait=x
Note:
Use Upload on the
Toolbar or Upload Data
in the Data menu to
upload data that will be
processed by SBE Data
Processing. Manually
entering DDb,e does not
produce data with the
required header
information for processing
by SBE Data Processing.
Data Upload
DDb,e
TT
TC
TP
Testing
TTR
TCR
TPR
TR
55
DESCRIPTION
Take sample, output converted data, and leave power
on. Data not stored in FLASH memory.
Take sample, output raw data, and leave power on.
Data not stored in FLASH memory.
Take sample, store in FLASH memory, output
converted data, and turn power off.
Take sample, store in FLASH memory, output
converted data, and leave power on.
Output converted data from last sample, then take new
sample, and leave power on. Data not stored in
FLASH memory.
Output raw data from last sample, then take new
sample, and leave power on. Data not stored in
FLASH memory.
Output converted data from last sample taken with
either Polled Sampling or Logging Commands.
x=Y: enable serial line sync mode. When RS-232 RX
line is high (3-10 VDC) for 1-1000 milliseconds,
MicroCAT takes a sample consisting of NAvg
measurements, stores averaged data in FLASH
memory, and transmits real-time averaged data.
x=N: disable serial line sync mode.
x= time (seconds) MicroCAT monitors RS-232 line
for commands after executing take sample command.
Range 0 - 120 seconds; default 0 seconds.
Upload data beginning with scan b, ending with
scan e. Send Stop before sending DDb,e.
Measure temperature 100 times or until Esc key is
pressed, output converted data.
Measure conductivity 100 times or until Esc key is
pressed, output converted data.
Measure pressure 100 times or until Esc key is
pressed, output converted data.
Measure temperature 100 times or until Esc key is
pressed, output raw data
Measure conductivity 100 times or until Esc key is
pressed, output raw data.
Measure pressure 100 times or until Esc key is
pressed, output raw data.
Measure real-time clock frequency 30 times or until
Esc key is pressed, output data.
Appendix III: Command Summary
CATEGORY
COMMAND
DC
Coefficients
(F=floating
point number;
S=string with
no spaces)
Dates shown
are when
calibrations
were
performed.
Calibration
coefficients
are initially
factory-set
and should
agree with
Calibration
Certificates
shipped with
MicroCAT.
TCalDate=S
TA0=F
TA1=F
TA2=F
TA3=F
CCalDate=S
CG=F
CH=F
CI=F
CJ=F
WBOTC=F
CTCOR=F
CPCOR=F
PCalDate=S
PA0=F
PA1=F
PA2=F
PTCA0=F
PTCA1=F
PTCA2=F
PTCB0=F
PTCB1=F
PTCB2=F
POffset=F
RCalDate=S
RTCA0=F
RTCA1=F
RTCA2=F
56
DESCRIPTION
Display calibration coefficients; all coefficients and
dates listed below are included in display. Use
individual commands below to modify a particular
coefficient or date.
S=Temperature calibration date.
F=Temperature A0.
F=Temperature A1.
F=Temperature A2.
F=Temperature A3.
S=Conductivity calibration date.
F=Conductivity G.
F=Conductivity H.
F=Conductivity I.
F=Conductivity J.
F=Conductivity wbotc.
F=Conductivity ctcor.
F=Conductivity cpcor.
S=Pressure calibration date.
F=Pressure A0.
F=Pressure A1.
F=Pressure A2.
F=Pressure ptca0
F=Pressure ptca1.
F=Pressure ptca2.
F=Pressure ptcb0.
F=Pressure ptcb1.
F=Pressure ptcb2.
F=Pressure offset.
S=Real-time clock calibration date.
F=Real-time clock A0.
F=Real-time clock A1.
F=Real-time clock A2.
Appendix IV: AF24173 Anti-Foulant Device
Appendix IV: AF24173 Anti-Foulant Device
AF24173 Anti-Foulant Devices supplied for user replacement are supplied in
polyethylene bags displaying the following label:
AF24173 ANTI-FOULANT DEVICE
FOR USE ONLY IN SEA-BIRD ELECTRONICS' CONDUCTIVITY SENSORS TO CONTROL THE GROWTH OF AQUATIC ORGANISMS
WITHIN ELECTRONIC CONDUCTIVITY SENSORS.
ACTIVE INGREDIENT:
Bis(tributyltin) oxide…………..………………………….....
OTHER INGREDIENTS: ……………………………….....
Total……………………………………………………….....
53.0%
47.0%
100.0%
DANGER
See the complete label within the Conductivity Instrument Manual for Additional Precautionary Statements and Information on the Handling, Storage, and
Disposal of this Product.
Net Contents: Two anti-foulant devices
Sea-Bird Electronics, Inc.
1808 - 136th Place Northeast
Bellevue, WA 98005
EPA Registration No. 74489-1
EPA Establishment No. 74489-WA-1
57
Appendix IV: AF24173 Anti-Foulant Device
AF24173 Anti-Foulant Device
FOR USE ONLY IN SEA-BIRD ELECTRONICS’ CONDUCTIVITY SENSORS TO CONTROL
THE GROWTH OF AQUATIC ORGANISMS WITHIN ELECTRONIC CONDUCTIVITY
SENSORS.
ACTIVE INGREDIENT:
Bis(tributyltin) oxide…………..…………………………..... 53.0%
OTHER INGREDIENTS: ………………………………..... 47.0%
Total………………………………………………………..... 100.0%
DANGER
See Precautionary Statements for additional information.
FIRST AID
If on skin or
clothing
If swallowed
If in eyes
•
•
•
•
•
•
•
•
•
•
Take off contaminated clothing.
Rinse skin immediately with plenty of water for15-20 minutes.
Call a poison control center or doctor for treatment advice.
Call poison control center or doctor immediately for treatment advice.
Have person drink several glasses of water.
Do not induce vomiting.
Do not give anything by mouth to an unconscious person.
Hold eye open and rinse slowly and gently with water for 15-20
minutes.
Remove contact lenses, if present, after the first 5 minutes, then continue
rinsing eye.
Call a poison control center or doctor for treatment advice.
HOT LINE NUMBER
Note to Physician Probable mucosal damage may contraindicate the use of gastric lavage.
Have the product container or label with you when calling a poison control center or doctor, or
going for treatment. For further information call National Pesticide Telecommunications
Network (NPTN) at 1-800-858-7378.
Net Contents: Two anti-foulant devices
Sea-Bird Electronics, Inc.
1808 - 136th Place Northeast
Bellevue, WA 98005
EPA Registration No. 74489-1
EPA Establishment No. 74489-WA-1
58
Appendix IV: AF24173 Anti-Foulant Device
PRECAUTIONARY STATEMENTS
HAZARD TO HUMANS AND DOMESTIC ANIMALS
DANGER
Corrosive - Causes irreversible eye damage and skin burns. Harmful if swallowed. Harmful if
absorbed through the skin or inhaled. Prolonged or frequently repeated contact may cause allergic
reactions in some individuals. Wash thoroughly with soap and water after handling.
PERSONAL PROTECTIVE EQUIPMENT
USER SAFETY RECOMMENDATIONS
Users should:
• Remove clothing immediately if pesticide gets inside. Then wash thoroughly and put on
clean clothing.
• Wear protective gloves (rubber or latex), goggles or other eye protection, and clothing to
minimize contact.
• Follow manufacturer’s instructions for cleaning and maintaining PPE. If no such instructions
for washables, use detergent and hot water. Keep and wash PPE separately from other
laundry.
• Wash hands with soap and water before eating, drinking, chewing gum, using tobacco or
using the toilet.
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.
Do not discharge effluent containing this product to sewer systems without previously notifying the
local sewage treatment plant authority. For guidance contact your State Water Board or Regional
Office of EPA. This material is toxic to fish. Do not contaminate water when cleaning equipment or
disposing of equipment washwaters.
PHYSICAL OR CHEMICAL HAZARDS
Do not use or store near heat or open flame. Avoid contact with acids and oxidizers.
DIRECTIONS FOR USE
It is a violation of Federal Law to use this product in a manner inconsistent with its labeling. For use
only in Sea-Bird Electronics’ conductivity sensors. Read installation instructions in the applicable
Conductivity Instrument Manual.
59
Appendix IV: AF24173 Anti-Foulant Device
STORAGE AND DISPOSAL
PESTICIDE STORAGE: Store in original container in a cool, dry place. Prevent exposure to
heat or flame. Do not store near acids or oxidizers. Keep container tightly closed.
PESTICIDE SPILL PROCEDURE: In case of a spill, absorb spills with absorbent material. Put
saturated absorbent material to a labeled container for treatment or disposal.
PESTICIDE DISPOSAL: Pesticide that cannot be used according to label instructions must be
disposed of according to Federal or approved State procedures under Subtitle C of the Resource
Conservation and Recovery Act.
CONTAINER DISPOSAL: Dispose of in a sanitary landfill or by other approved State and
Local procedures.
Sea-Bird Electronics/label revised 01-31-05
60
Appendix V: Replacement Parts
Appendix V: Replacement Parts
Part
Number
Part
50243 / Lithium battery set
50243.1 (6 sticks)
Application Description
Power MicroCAT
Quantity in
MicroCAT
1
801542
AF24173 Anti-Foulant
Device
Bis(tributyltin) oxide device
inserted into anti-foulant
device cup
1 (set of 2)
231459
Anti-foulant device cup
Holds AF24173 Anti-Foulant
Device
2
231505
Anti-foulant device cap
Secures AF24173 Anti-Foulant
Device in cup
2
Plug
Seals end of anti-foulant cap
when not deployed, keeping dust
and aerosols out of conductivity
cell during storage
2
Triton X-100
Octyl Phenol Ethoxylate –
Reagent grade non-ionic cleaning
solution for conductivity cell
(supplied in 100% strength; dilute
as directed)
-
30984
30411
Conductivity cell filling &
For cleaning and storing
50087.1 storage device with hose
conductivity cell
barb caps
-
801412
3-pin RMG-3FS to 9-pin
DB-9S I/O cable,
2.4 m (8 ft)
From MicroCAT to computer
1
801385
4-pin RMG-4FS to 9-pin
DB-9S I/O cable with
power leads, 2.4 m (8 ft)
From MicroCAT (with optional
external power) to computer
1
17043
Locking sleeve (for RMG) Locks cable/plug in place
1
3-pin RMG-3FSD-LP
17045.1 dummy plug with
locking sleeve
For when cable not used
1
4-pin RMG-4FSD-LP
17046.1 dummy plug with locking
sleeve
For when cable not used
1
801366
3-pin MCIL-3FS
(wet-pluggable connector)
From MicroCAT to computer
to 9-pin DB-9S I/O cable,
2.4 m (8 ft)
1
801206
4-pin MCIL-4FS (wetpluggable connector) to 9- From MicroCAT (with optional
pin DB-9S I/O cable with external power) to computer
power leads, 2.4 m (8 ft)
1
171192
Locking sleeve (wetpluggable connector)
1
Locks cable/plug in place
3-pin MCDC-3-F dummy
171500.1 plug with locking sleeve,
wet-pluggable connector
For when cable not used
4-pin MCDC-4-F dummy
171398.1 plug with locking sleeve,
wet-pluggable connector
For when cable not used
171888
25-pin DB-25S to
For use with computer with
9-pin DB-9P cable adapter DB-25 connector
Continued on next page
61
1
1
Appendix V: Replacement Parts
Continued from previous page
Part
Part
Number
30507
60035
Application Description
Quantity in
MicroCAT
Parker 2-206N674-70
O-ring
O-ring between end of
conductivity cell and
anti-foulant device cup
2
37-SM / -SMP
spare hardware/
O-ring kit
Assorted hardware and
O-rings, including:
• 30900 Machine screw, 1/4-20 x
2” hex head, titanium (secures
mounting clamp)
• 30633 Washer, 1/4” split ring
lock, titanium (for screw
30900)
• 30634 Washer 1/4” flat,
titanium (for screw 30900)
• 31019 O-ring 2-008 N674-70
(for screw 30900 – retains
mounting clamp hardware)
• 31040 Screw, 8-32 x 1 FH, TI
(secures cable guide base to I/O
connector end cap)
• 30860 Screw, 6-32 x ½ FH TI
(secures cable clamp half to flat
area of sensor end cap)
• 30544 Screw 8-32 x ½ FH,
titanium (secures cell guard to
housing)
• 30859 Screw, 8-32 x 3/8” FH,
PH, titanium (secures housing
to I/O connector end cap)
• 30857 Parker 2-033E515-80
O-ring (I/O connector end cap
and sensor end cap O-ring)
• 30149 Screw, 6-32 x 5/8 PH,
stainless steel (secures battery
pack assembly to battery pylon)
• 30243 Washer, #6 split ring
lock, stainless steel
(for screw 30149)
• 30357 Screw, 2-56 x 1/4 PH,
stainless steel (secures battery
pack’s upper PCB to brass
sleeve)
• 30986 Washer, #2 split ring
lock, stainless steel
(for screw 30357)
-
62
Index
Index
A
E
About Sea-Bird · 5
Anti-Foulant Device · 57
removal before shipping to Sea-Bird · 47
replacing · 46
Electronics disassembly/reassembly · 53
End cap · 11, 42
External power · See Power, external
F
B
Format
data output · 34
Functional description · 52
Batteries · 10, 35
description · 15
endurance · 13
installing · 15
replacing · 45
shipping precautions · 7
Baud rate · 25, 28
G
Glossary · 51
Guard
removal · 46
C
L
Cable length · 14, 25
Calibration · 47
Cleaning · 43
Clock · 10
Command summary · 54
Commands
autonomous sampling · 29
calibration coefficients · 33
data upload · 32
descriptions · 26
logging · 29
output format · 28
polled sampling · 31
serial line sync · 31
setup · 28
status · 27
testing · 32
Communication defaults · 20
Conductivity cell cleaning · 43
Connector · 11, 42
Convert .asc to .cnv · 41
Corrosion precautions · 42
Limited liability statement · 2
M
Maintenance · 42
Memory · 10
Modes · See Sampling modes
P
Parker Super O-Lube · 51
Parts
replacement · 61
Plastic housing
handling · 44
Power · 14
external · 10, 13
Pressure sensor
maintenance · 43
Q
D
Quick start · 5
Data output format · 28, 34
Data processing · 9, 41
installation · 17
Deployment
installation · 36
preparing for · 15
setup · 35
Derive · 41
Description · 8
Dimensions · 11
R
Real-time setup
baud rate · 25
cable length · 25
Recovery
physical handling · 37
uploading data · 38
Replacement parts · 61
63
Index
S
T
Sample timing · 12
Sampling modes · 22
autonomous · 23
polled · 22
serial line sync · 24
SBE Data Processing · 9, 17, 41
SeaPlot · 41
SEASOFT-Win32 · 9, 17
SEATERM · 9, 17, 18, 38
main screen · 18
toolbar buttons · 19
Sensors · 10
ShallowCAT
handling · 44
Shipping precautions · 7
Software · 9
Software installation · 17
Specifications · 10
Storage · 43
Super O-Lube · 51
System description · 8
Terminal program · 9
installation · 17
Testing · 17
Timeout description · 26
Transient current · 13
Triton · 51
Troubleshooting · 49
U
Unpacking MicroCAT · 6
Uploading data · 38
W
Wiring · 17
64