Conductivity, temperature, and pressure

Accuracy of conductivity measurements is affected by objects within 15cm of the sensor, especially if they are conductive. Metal deployment frames are a good example. This proximity effect decreases with distance. Calibration procedure uses the predetermined k-factor to take into account static elements, such as other sensors or glider body.

The RBRlegato⁴ C.T.D integrates conductivity, temperature, and pressure sensors, as shown in Fig. 2. Its unique body design is optimised for flow dynamics.

Fig. 2. Side view of an RBRlegato⁴ C.T.D. (a) Temperature sensor. (b) Conductivity sensor. (c) Pressure sensor.

Parameter	Conductivity sensor	Temperature sensor	Pressure sensor
Range	0 to 85mS/cm	-5°C to 42°C	1250dbar
Initial accuracy	±0.003mS/cm	±0.002°C (-5 to +35°C) ±0.004°C (+35 to +42°C)	±0.05% full scale
Resolution	<0.001mS/cm	0.00005°C	<0.001% full scale
Typical stability	±0.010mS/cm per year	±0.002°C/year	±0.01% full scale
Time constant	N/A	<1s (standard) <0.1s ( \| fast16)	<0.01s

Parameter

Conductivity sensor

Temperature sensor

Pressure sensor

Range

0 to 85mS/cm

-5°C to 42°C

1250dbar

Initial accuracy

±0.003mS/cm

±0.002°C (-5 to +35°C)
±0.004°C (+35 to +42°C)

±0.05% full scale

Resolution

<0.001mS/cm

0.00005°C

<0.001% full scale

Typical stability

±0.010mS/cm per year

±0.002°C/year

±0.01% full scale

Time constant

N/A

<1s (standard)

<0.1s ( | fast16)

<0.01s