Manual revision 001
Section 2: Description of SBE 39
plus
-IM
SBE 39
plus
-IM
11
Specifications
Temperature (°C)
Strain-Gauge Pressure (optional)
Measurement
Range
-5 to +45
0 to full scale range:
20 / 100 / 350 /
600 / 1000 / 2000 / 3500 / 7000 m
Meters of deployment depth capability.
Initial Accuracy
±
0.002 (-5 to 35 °C)
±
0.01 (35 to 45 °C)
±
0.1% of full scale range
Typical Stability
0.0002 per month
0.05% of full scale range per year
Resolution
0.0001
0.002% of full scale range
Sensor
Calibration
-1 to +32
Ambient pressure to full scale range
in 5 steps
Memory
64 Mbyte non-volatile FLASH memory
Data Storage
Temperature 3 bytes/sample, Time 4 bytes/sample,
Pressure (optional) 5 bytes/sample.
T, time
9,500,000 samples
(12-sec interval for 2 years)
T, P, time
5,500,000 samples
(7-sec interval for 2 years)
Real-Time Clock
32,768 Hz TCXO accurate to ±1 minute/year
Internal Battery
Pack
Four 3.6-volt, non-hazardous, AA lithium cells,
manufactured by Saft (LS14500) or Tadaran.
NOTE:
Do not use AA alkaline batteries.
Sampling Speed
User-programmable 5-sec to 6-hour intervals
Current
Consumption,
Sample Timing
Power
*
Autonomous
Sample
(mA-sec)
Polled
Sample
(mA-sec)
Transmit
(mA-sec/
character) **
T
only
low
0.7
1.3
0.022
T, P
low
0.84
1.3
0.022
T
only
full
0.7
1.9
0.032
T, P
full
0.84
1.9
0.032
* SetEnableFullPwrTX=Y for full power, =N for low power.
** Include spaces, carriage return, line feed in character count.
Quiescent Current
: 60 µA
Current when awake but not sampling:
800 µA
Sample Time:
0.28 sec
Transmit time:
0.0085 sec/character
Battery Pack
Endurance
Usually
limited by memory capacity (see Data Storage
above; see
Battery Pack Endurance
for examples).
Notes:
1. This endurance is achieved if 39
plus
-IM is deployed in
recommended
orientation: thermistor end down or horizontal
(see
Deployment
Orientation
in
Section 2: Description of SBE 39plus-IM
).
2. 39
plus
-IM stops sampling and does not overwrite data if memory is
full.
Housing,
Depth Rating
PET plastic, 600 meters (1960 feet)
Titanium, 10,500 meters (34,400 feet)
Weight
(without
fairing/net fender)
Plastic housing, embedded thermistor
:
In air: 1.1 kg (2.4 lbs); In water: 0.5 kg (1.1 lbs)
Titanium housing, embedded thermistor
:
In air: 1.6 kg (3.6 lbs), In water: 1.0 kg (2.2 lbs)
Note:
If the 39
plus
-IM is logging data
and the battery pack voltage is
less than 5 volts for ten
consecutive scans, the 39
plus
-IM
halts logging and sets the logging
status to low battery.
