RBRbrevio3
Shortest CTD (conductivity, temperature, pressure/depth) logger
The RBRbrevio³ C.T.D is short in stature but tall on performance. With world-class sensor accuracy, a sampling rate up to 32Hz, and realtime data output, it is uniquely designed to determine salinity. The shortest of RBR standard instruments, the RBRbrevio³ C.T.D is best suited for applications where size and weight are critical.
- 240M readings
- Short housing for vehicle integration
- Up to 32Hz sampling
- USB-C download
- Realtime communications
- Twist activation
- Wi-Fi option
- C.T.D
Features & Configurations
RBRbrevio³ C.T.D
Optimized for vehicle integration applications, the RBRbrevio³ offers a short housing and a right-angle or in-line connector to fit your needs. It is uniquely designed to determine salinity by measuring the conductivity and temperature of water. Equipped with a pressure channel, the RBRbrevio³ provides accurate salinity data even when the instrument is sampling at varying depths.
Salinity
Conductivity measurements are performed using a rugged inductive cell suitable for deployment in marine, estuarine, or fresh water. There are no exposed contacts, which avoids susceptibility to corrosion, and the housing may be frozen into ice without damage. It is characterized for the mechanical effects of both temperature and pressure to allow for accurate correction in salinity derivation. These coefficients are provided for customers who prefer to calculate their own corrections. In addition, it is suitable for use outside the usual realms of PSS-78 practical salinity scale, in applications such as desalination brine monitoring. The conductivity readings are temperature-corrected.
For profiling applications, the co-located thermistor reduces salinity spiking, thus increasing data accuracy.
Equipped with a piezoresistive pressure channel, the CTD instruments provide more accurate salinity data when the instrument is sampling at varying depths.
Silent operation
The CFD-optimised, low aspect ratio conductivity cell is self-flushing and does not require a pump. Totally silent operation is optimized for stealth missions and passive acoustic listening.
Optional configurations
- Wi-Fi communication
- External data and power connection via connectorised end-caps
- | fast8, | fast16, or | fast32 sampling for profiling
- | deep variants in titanium housing for depths up to 6000m
Specifications
| Storage | 240M readings |
|---|---|
| Internal power | 4 AA cells |
| External power | 4.5-30V |
| Communication | RS-232 |
| Clock drift | ±60 seconds/year |
| Housing | Plastic or titanium |
| Diameter |
63.3mm (plastic) 60.3mm (titanium) |
| Length* |
~330-400mm * The total length depends on the battery end-cap type. |
| Weight (without batteries) |
~0.90kg in air, ~0.14kg in water (plastic) ~1.75kg in air, ~1.00kg in water (titanium) |
| Depth rating |
750m (plastic) |
| Sampling speed | 2Hz to 24h |
| |fast8 | 4, 8Hz |
| |fast16 | 4, 8, 16Hz |
| |fast32 | 4, 8, 16, 24, 32Hz |
| Range | 0-85mS/cm |
|---|---|
| Initial accuracy | ±0.003mS/cm |
| Resolution | <0.0001mS/cm |
| Typical stability | ±0.010mS/cm/year |
| Range | -5°C to 35°C |
|---|---|
| Initial accuracy | ±0.002°C |
| Resolution | <0.00005°C |
| Typical stability | ±0.002°C/year |
| Time constant | <0.1s | fast, <1s standard |
| Range |
20 / 50 / 100 / 200 / 500 / 750dbar (plastic) 1000 / 2000 / 4000 / 6000dbar (titanium) |
|---|---|
| Initial accuracy | ±0.05% full scale |
| Resolution | <0.001% full scale |
| Typical stability | 0.05% full scale |
| Time constant | <10ms |
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