# Conductivity - corrected for temperature and pressure

Let us consider a conductivity sensor integrated on the RBR*concerto*³ C.T.D. The conductivity reading from Channel-1 without corrections is given by a simple linear function:

where R is the normalized voltage ratio from Channel-1 monitoring conductivity, **c0,c1** are the core coefficients of the linear equation, and Craw is the uncorrected conductivity output, reported in mS/cm for RBR marine instruments.

The equation which corrects the output for the effects of both temperature and pressure on the conductivity cell is:

Casting the equation into the style used by the logger would give:

where

- Craw is the uncorrected conductivity,
**c0**+**c1****×****R** **x0**,**x1**,**x2**correspond directly to the constants "Kc1", "Kc2" and "Kc3"**x3**is the calibration temperature "Tcal" in °C-
**x4**is the calibration pressure "Pcal" in dbar **n0**is the index of the temperature channel, in this example 2- value(
**n0**) is the final output value of the temperature channel in °C **n1**is the index of the pressure channel, in this example 3

value(**n1**) is the final output value of the pressure channel in dbar- Ccorr is the corrected output in mS/cm