Physical specifications

Instrument

Specification Description

Max number of readings

240 million

Power

8 AA-type cells (RBRduo³, RBRconcerto³); 4 AA-type cells (RBRbrevio³)1

External power

4.5 to 30V

Communications

Internal: USB-C; external: USB and RS-232 / RS-485

Clock drift

±60 seconds/year

Housing

Plastic or titanium

Diameter

63.3mm (plastic); 60.3mm (Ti)

Depth rating

up to 6000m

Sampling rate

2Hz; options up to 32Hz

1 RBR ships the CT and CTD instruments with lithium thionyl chloride batteries. See Ruskin User Guide: Standard Instruments³ for other suitable battery chemistries.

Length and weight

Instrument Length2 Weight in air2

RBRduo³ C.T

~420-490mm

~1.3kg (plastic), ~2.8kg (titanium)

RBRbrevio³ C.T.D

~330-400mm

~0.9kg (plastic), ~1.7kg (titanium)

RBRconcerto³ C.T.D

~420-490mm

~1.3kg (plastic), ~2.8kg (titanium)

2 Configuration dependent. The total length and weight of an instrument depend on the battery end-cap type.

screen shot 2022 08 23 at 10 47 50 am
Fig. 1.    RBRbrevio³ dimensions with three different battery end-caps

Power supply selection

If connected, an external power supply will be used preferentially over the internal batteries as long as the voltage remains 4.5V or greater. If it drops below 4.5V or complete disconnection occurs, the system automatically switches to the internal batteries.

Clock

The instrument clock is maintained during brief disconnections. This time is usually sufficient to change batteries. If the clock is lost, the time will revert to January 2000. In this case, check the power supply and synchronise with the computer again.

USB-C power

The USB-C cable provides power sufficient for configuration or data download. However, the instrument requires an internal or external power supply to perform sampling.

External MCBH-6-MP connector pinout

screen shot 2019 04 26 at 3 06 03 pm

Pin No.

USB

RS-232

RS-485

1

Ground

2

Power +4.5 to +30V

3

N/C

From the
instrument (Tx)

From the
instrument (Tx-)

4

+5V

Into the
instrument (Rx)

Into the
instrument (Rx+)

5

D-

N/C

Into the
instrument (Rx-)

6

D+

N/C

From the
instrument (Tx+)

For deployment estimates specific for your instrument configuration and sampling options:

  • Go to Ruskin and click the "Instruments" tab

  • Select "Simulate an instrument…​", find your logger under "Standard instruments", and click "OK"

  • Adjust variable parameters under "Configuration" to match your needs

  • Ruskin autonomy engine will calculate the End date and indicate when your deployment is likely to stop

Note that deployment estimates are the same for shallow and deep variants.