Temperature (T)

RBR standard instruments with a "T" in the name, such as RBRduo³ T.D, RBRbrevio³ C.T.D, or RBRconcerto³ C.T.D.ODO.Tu, use the thermistor-type temperature sensors, as shown in Fig. 9. These are rated for depths of up to 10km.

Fig. 9. An RBRduo³ T.D and an RBRconcerto³ C.T.D | deep with thermistor-type temperature sensors

The depth rating of each instrument as a whole takes into account all integrated sensors and thus could be lower than 10km.

Specifications

Parameter	Value
Range¹	-5 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

Parameter

Value

Range¹

-5 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

¹ A wider temperature range is available upon request. Contact RBR for more information.

Calibration equations

Temperature

\[T_m=\ln\left(\left(\frac{1}{V}\right)-1\right)\]

\[T_c=\frac{1}{(C_0+C_1T_m+C_2T^2_m+C_3T^3_m)}-273.15\]

where:

\(T_m\) = Intermediate variables

\(V\) = Raw temperature channel voltage ratio output (unique with each individual measurement)

\(C_0\) = Cubic function regression calibration coefficient

\(C_1\) = Cubic function regression calibration coefficient

\(C_2\) = Cubic function regression calibration coefficient

\(C_3\) = Cubic function regression calibration coefficient

\(T_c\) = Temperature in celsius

Derived parameters: salinity, density anomaly, specific conductivity, speed of sound, oxygen concentration, oxygen saturation