RBRcoda³ D

The RBRcoda³ D and RBRcoda³ D | deep (Fig. 2) use the piezoresistive pressure sensors.

The sensor is protected by a clear plastic guard. During deployments, always orient the sensor downwards to reduce debris collecting in the housing.

pressure (1).png
Fig. 2.    RBRcoda³ D and RBRcoda³ D | deep

Pressure

Parameter Value

Range

20 / 50 / 100 / 200 / 500 / 1000dbar (plastic)
1000 / 2000 / 4000 / 6000dbar (Ti)

Initial accuracy

±0.05% full scale

Resolution

<0.001% full scale

Typical stability

±0.05% full scale / year

Time constant

<10ms

Physical

Parameter Value

Connector

MCBH-6-MP

Communications

RS-232

Housing

Plastic or titanium

Diameter

25mm

Length

~200mm (~235mm with connector)

Weight

170g in air, 70g in water (plastic)
370g in air, 270g in water (Ti)

Depth rating

Up to 1000m (plastic)
Up to 6000m (Ti)

Sampling rate

2Hz standard, 8Hz | fast8, 16Hz | fast16, | tide16
32Hz | fast32

Power

Parameter Value

Supply voltage

6V to 18V (12V nominal)

Power

10mA (120mW)

Calibration equations

\[P_{raw} = C_0+C_1\cdot VR+C_2\cdot VR^2+C_3 \cdot VR^3\]

Raw pressure

where:

\(C_0-C_3\)are unit-specific calibration coefficients determined in the laboratory.

\(VR\) is the measured Voltage Ratio

Temperature compensated pressure

\[P_{meas} = P{cal}+\frac{(P_{raw}-P_{cal})-X_1\cdot (T_{pres}-Tcal)-X_2\cdot(T_{pres}-Tcal)^2-X_3\cdot(T_{pres}-Tcal)^3}{1+X_4\cdot (T_{pres}-Tcal)}\]

where:

\(P_{raw}\) is the uncorrected pressure

\(P_{cal}\)is the nominal pressure while performing the temperature calibration segment
(stored as "X0" in the instrument)

\(T_{pres}\) is the temperature of the pressure sensor

\(Tcal\) is the average temperature during the room-temperature pressure calibration run
(stored as "X5" in the instrument).

\(X_1-X_4\) are unit-specific calibration coefficients determined in the laboratory