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Moored Profiler CTD & Optional DO Sensor
SBE 52-MP

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Print version     Current manual (for older manuals, click here)     Configuration options & accessories


Shown with optional SBE 43F Dissolved Oxygen Sensor

The SBE 52-MP is a conductivity, temperature, depth (pressure) sensor (CTD), designed for moored profiling applications in which the instrument makes vertical profile measurements from a device that travels vertically beneath a buoy, or from a buoyant sub-surface sensor package that is winched up and down from a bottom-mounted platform. The 52-MP incorporates pump-controlled, TC-ducted flow to minimize salinity spiking. On typically slow-moving packages (e.g., 20 - 50 cm/sec), its sampling rate of once per second provides good spatial resolution of oceanographic structures and gradients. The 52-MP can optionally be configured with a Dissolved Oxygen Sensor Module (SBE 43F), as shown in the photo. The SBE 43F is a frequency-output version of our SBE 43 Dissolved Oxygen Sensor, and carries the 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. The 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 select to upload data in hexadecimal or binary. 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:

PUMP

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

CONFIGURATION

A standard SBE 52-MP is supplied with:

Options include:

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 and Depth Rating:
Standard  3AL/2.5V Titanium, 7000 meters (22,900 feet)
Optional  Plastic, 600 meters (1960 feet)

Weight:
Standard titanium housing
   In air  5.3 kg (11.8 lbs)
   In water  3.7 kg (8.2 lbs)
Optional plastic housing
   In air  3.2 kg (7.0 lbs)
   In water  1.5 kg (3.4 lbs)

(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.

Software -- components of Seasoft V2

Links to Other Instruments of Interest

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Specifications are subject to change without notice.

Last modified: 23 Feb 2011

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