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Moored Profiler CTD & Optional DO Sensor

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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



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.


The SBE 52-MP has two sampling modes:


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


A standard SBE 52-MP is supplied with:

Options include:


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.


  Measurement Range Initial Accuracy Typical Stability Resolution Calibration
-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

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)


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

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

Software -- components of Seasoft V2

Links to Other Instruments of Interest

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Specifications are subject to change without notice.

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