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Moored Profiler CTD & Optional DO Sensor
SBE 52-MP

Print version Current manual (older manuals) Configuration options & accessories

SBE 52-MP Moored Profiler CTD and Dissolved Oxygen Sensor
Shown with optional SBE 43F Dissolved Oxygen Sensor

SUMMARY

Conductivity, Temperature, Pressure, optional Dissolved Oxygen, at 1 sample/sec (1 Hz).
RS-232 or Logic Level interface, no batteries, small memory — for use on moored profiling vehicles that can supply power and acquire data.
Pump-controlled, T-C ducted flow to reduce salinity spiking.
Unique flow path, pumping regimen, and expendable anti-foulant devices, for maximum bio-fouling protection.
Depths to 600 meters (plastic housing) or 7000 meters (titanium housing).
Five-year limited warranty.

DESCRIPTION

The SBE 52-MP is a Conductivity, Temperature, Depth (pressure) sensor, designed for moored profiling applications in which measurements are made from from a device that travels vertically beneath a buoy, or from a buoyant package that is winched up and down from a bottom-mounted platform. On typical slow-moving packages (20 - 50 cm/sec), its once-per-second sampling rate provides good spatial resolution of oceanographic structures and gradients. The 52-MP's pump-controlled, TC-ducted flow minimizes salinity spiking. The 52-MP can optionally be configured with an SBE 43F Dissolved Oxygen Sensor, a frequency-output version of our SBE 43 (same performance specifications).

The SBE 52-MP uses the same accurate and stable thermistor, conductivity cell, and pressure sensor that are used in the MicroCAT and Argo Float products. It is easy-to-use, compact, and ruggedly made of titanium and other low-maintenance (plastic) materials. Operating commands are easy to execute with a third-party data logger or your own acquisition system. EEPROM-stored calibration coefficients permit data upload in ASCII engineering units (mmho/cm, degrees C, decibars, ml/l). Alternatively, the user can upload hexadecimal or binary data. The SBE 52-MP is externally powered, and temporarily stores data in static RAM memory. If/when power is removed, any data stored in memory is lost.

SAMPLING MODES

The SBE 52-MP has two sampling modes:

Autonomous sampling -- On command, the 52-MP begins autonomous sampling, running continuously and sampling at 1 scan/second (1 Hz). It stores the data in memory, and can also transmit in real-time. It can bin average the data, and store the averaged data in memory in addition to the unaveraged data. On command (typically at the end of each profile), data is uploaded to the moored profiler.
Polled sampling -- On command, the 52-MP takes one sample and transmits the data in real-time.

PUMP

The SBE 52-MP’s integral pump runs while the instrument is sampling, providing the following advantages over a non-pumped system:

Improved conductivity and oxygen response -- The pump brings a new water sample into the system at a constant flow rate, fixing the sensors' time constants to ensure maximum dynamic accuracy, and flushes the previously sampled water. For polled sampling, pump run time for best DO accuracy is a function of temperature and pressure, and is automatically determined by the 52-MP (55 seconds maximum).
Reduced fouling -- When not sampling, the U-shaped flow path and pump impeller restrict flow, maintaining an effective concentration of anti-foulant inside the conductivity cell to minimizing fouling.

CONFIGURATION

A standard SBE 52-MP is supplied with:

Titanium housing for depths to 7000 meters (22,900 feet)
Conductivity, temperature, and pressure (offered in eight full scale ranges from 20 to 7000 dbars) sensors
Integrated T-C Duct and internal pump for flow-controlled conductivity, temperature, and dissolved oxygen sensor response
Anti-foulant fittings and expendable anti-foulant devices
RS-232 or logic level (0 - 3.3V) interface (factory configured)
XSG 4-pin I/O bulkhead connector
IE-55 bulkhead connector for optional SBE 43F Dissolved Oxygen Sensor
3/8-16 locator/mounting hole in the sensor end cap, to assist in mounting to a McLane MMP moored profiler

Options include:

Plastic housing for depths to 600 meters (1960 feet)
SBE 43F Dissolved Oxygen Sensor (frequency-output version of our SBE 43)
Wet-pluggable MCBH connector in lieu of standard (XSG) I/O connector

SOFTWARE

The SBE 52-MP is supplied with a Win 2000/XP software package, Seasoft^© V2, which includes Seaterm^©, a terminal program for instrument setup and data display.

SPECIFICATIONS

	Measurement Range	Initial Accuracy	Typical Stability	Resolution	Calibration
Temperature (°C)	-5 to +35	± 0.002	0.0002 per month	0.0001	+1 to +32
Conductivity	0 - 90 mmho/cm (0 - 9 S/m)	± 0.003 mmho/cm (0.0003 S/m)	0.003 mmho/cm (0.0003 S/m) per month	0.0005 mmho/cm (0.00005 S/m) (oceanic waters; resolves 0.4 ppm in salinity) 0.0007 mmho/cm (0.00007 S/m) (high salinity waters; resolves 0.4 ppm in salinity) 0.0001 mmho/cm (0.00001 S/m) (fresh waters; resolves 0.1 ppm in salinity)	zero conductivity (air) plus 26 to 60 mmho/cm (2.6 to 6 S/m)
Pressure	0 to 20 / 100 / 350 / 600 / 1000 / 2000 / 3500 / 7000 meters	± 0.1% of full scale range	0.05% of full scale range per year	0.002% of full scale range	Ambient barometric to full scale range in 5 steps
Dissolved Oxygen	120% of surface saturation (all natural waters, fresh and salt)	± 2% of saturation	0.5% per 1000 hours (clean membrane)	0.035% of saturation (corresponds to 0.003 ml/l at 0 °C and 35 PSU)	1, 4, and 7 ml/l (approximate) at 2, 6, 12, 20, 26, and 30 °C (18 points)

Power Requirements:
Input power -- 3 Watts at 7-16 VDC (consult factory for voltage outside this range)
Turn-on transient -- 300 mA at 10 V
Quiescent (sleep) state -- 0.008 mA at 10 V
Awake but not sampling -- 5.2 mA at 10 V
Sampling (includes pump) -- 62 mA at 10 V

Memory:
Static RAM; stores up to 28,000 samples of conductivity, temperature, pressure, and dissolved oxygen data.
Note: If external power is removed, any data in memory is lost.

Housing Material, Depth Rating, and Weight:
Standard 3AL/2.5V Titanium, 7000 meters (22,900 feet), 5.3 kg (11.8 lbs) in air, 3.7 kg (8.2 lbs) in water
Optional Plastic, 600 meters (1960 feet), 3.2 kg (7.0 lbs) in air, 1.5 kg (3.4 lbs) in water

(DO sensor cable not shown for clarity)

ADDITIONAL INFORMATION / LINKS:

Documentation -- manual, photos, technical papers, application notes, etc.

Sales Information -- options, accessories, cables, mount kits, spares, etc.

Configuration options & accessories:
- Details for SBE 52-MP
- Listing for all products
Cables
Spare parts

Software -- components of Seasoft V2

Seaterm -- description, download

Links to Other Instruments of Interest

SBE 43 Dissolved Oxygen Sensor
Other CTDs:
- SBE 9plus -- premium CTD, fast sampling, can acquire data from auxiliary sensors
- SBE 25plus -- fast sampling, can acquire data from auxiliary sensors
- SBE 19plus V2 -- small, economical CTD, can acquire data from auxiliary sensors
- SBE 49 -- CTD for towed vehicles, ROVs, AUVs, etc.
- Glider Payload CTD (GPCTD) -- CTD (and optional dissolved oxygen) for autonomous gliders

Specifications are subject to change without notice.

Sea-Bird Home Phone: (+1) 425-643-9866 E-mail: seabird@seabird.com

Moored Profiler CTD & Optional DO Sensor SBE 52-MP

Moored Profiler CTD & Optional DO Sensor
SBE 52-MP