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SeaCAT Profiler CTD
SBE 19plus V2

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19plus V2 SeaCAT Profiler CTD



The SBE 19plus V2 (Version 2) SeaCAT Profiler measures conductivity, temperature, and pressure (depth) and provides high accuracy and resolution, reliability, and ease-of-use for a wide range of research, monitoring, and engineering applications. The pump-controlled, TC-ducted flow configuration minimizes salinity spiking caused by ship heave and allows for slow descent rates without slowing sensor responses, improving dynamic accuracy and resolving small scale structure in the water column.

Compared to the previous 19plus, the V2 incorporates an electronics upgrade and additional features, with six differentially amplified A/D input channels, one RS-232 data input channel, and 64 MB FLASH memory. An optional Digiquartz pressure sensor provides highest-accuracy pressure measurement. Data can be output in XML as well as ASCII and HEX formats. Firmware upgrades can be downloaded through the communications port, without opening the instrument.

The 19plus V2 samples continuously at up to 4 scans per second (4 Hz) (2 Hz with Digiquartz), is battery-powered and self-recording, and is commonly used in the field without a computer, recording up to 1000 individual profiles. Data can be uploaded and processed later, as well as transmitted to a PC in real time for acquisition and display using Seasoft software provided (cable length dependent on number of auxiliary sensors, sampling and baud rate, and cable properties). The 19plus V2 can supply power to 7 external sensors and log their outputs with each CTD scan. Nine D-size alkaline batteries provide up to 60 hours of continuous operation when logging C, T, and P at 4 Hz.

The 19plus V2 is easily integrated with an SBE 32 Carousel Water Sampler and is ideal for integration with the SBE 55 ECO Water Sampler. Both real-time and autonomous auto-fire operations are possible with any Sea-Bird CTD / Water Sampler system.

In moored mode, the 19plus V2 records time series measurements at user-programmable intervals (10 seconds to 4 hours). Moored mode is easily configured with setup commands and by removing the profiling T-C Duct and installing optional anti-foulant devices. (If profiling not needed, the 16plus V2 SeaCAT Recorder offers greater moored-mode flexibility.)


A standard SBE 19plus V2 is supplied with plastic housing for depths to 600 meters, strain-gauge pressure sensor, 64 Mbyte FLASH RAM memory, alkaline batteries, glass-reinforced epoxy bulkhead connectors, SBE 5M miniature pump with plastic housing, and T-C Duct.

Options and accessories include:

* pH sensor for integration in Profiling mode only; not applicable to Moored mode


The SBE 19plus V2 is supplied with a powerful Windows 2000/XP software package, Seasoft V2, which includes programs for communication and data retrieval, real-time data acquisition and display, and data processing (filtering, aligning, averaging) and plotting.


Dimensions in millimeters (inches)

Note: 19plus V2 with optional Quartz pressure sensor is 190 mm (7.5 inches) longer than shown in drawing.

  Measurement Range Initial Accuracy Typical Stability Resolution
Conductivity (S/m) 0 - 9 0.0005 0.0003
0.00005 (most oceanic waters; resolves 0.4 ppm in salinity)
0.00007 (high salinity waters; resolves 0.4 ppm in salinity)
0.00001 (fresh waters; resolves 0.1 ppm in salinity)
Temperature (C) -5 to +35 0.005 0.0002
Pressure -- Strain-Gauge 0 to 20 / 100 / 350 / 600 / 1000 / 2000/ 3500 / 7000 meters 0.1% of full scale range 0.1% of full scale range/year 0.002% of full scale range
Pressure --
0 to  20 / 60 / 130 / 200 / 270 / 680 / 1400 / 2000 / 4200 / 7000 / 10500 meters 0.02% of full scale range 0.02% of full scale range/year 0.0025% of full scale range

Memory: 64 Mbyte non-volatile FLASH memory

Data Storage:
Recorded Parameter Bytes/Sample
T + C 6
Pressure -- strain-gauge or Quartz 5
each external voltage 2
auxiliary RS-232 sensor sensor dependent

Real-Time Clock: 32,768 Hz TCXO accurate to 1 minute/year

Internal Batteries: 9 alkaline D-cells (Duracell MN1300, LR20) provide 60 hours profiling; optional 9-cell NiMH battery pack provides 40 hours profiling per charge

External Power Supply: 9 - 28 VDC; consult factory for required current

Power Requirements:
Sampling: 70 mA
SBE 5M pump: 100 mA
Optional SBE 5T or 5P pump: 150 mA
: 65 mA
: 20 A

Auxiliary Voltage Sensors:
Auxiliary power out: up to 500 mA at 10.5 - 11 VDC
A/D resolution: 14 bits
Input range: 0 - 5 VDC

Depth Rating, Housing, and Weight:

Depth Rating Housing Material Weight in air (without pump) * Weight in water (without pump) *
600 m (1950 ft) acetal copolymer plastic 7.3 kg (16 lbs) 2.3 kg (5 lbs)
7000 m (22,900 ft) 3AL-2.5V titanium 13.7 kg (30 lbs) 8.6 kg (19 lbs)
* Weights listed are without pump; pump adds (in air) 0.3 to 0.7 kg (0.6 to 1.5 lbs), depending on pump model selected. See pump brochures (SBE 5M or 5T & 5P) for details.

Optional Cage:
(for 19plus V2 with strain gauge pressure) 1016 x 241 x 279 mm (40 x 9.5 x 11 inches), 6.3 kg (14 lbs)  (see drawing 22009)
(for 19plus V2 with Digiquartz pressure) 1219 x 241 x 279 mm (48 x 9.5 x 11 in.)  (see drawing 22010)


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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