Temperature Sensor Calibration; Conductivity Sensor Calibration - idronaut Ocean Seven 304Plus Operator's Manual

SECTION THREE – COMMANDS
a = -18.173212
b = 0.018204
c = -12.46533E-12
Once the last coefficient has been entered, the CTD performs the pressure sensor offset,
Pressure sensor offset = 0.017830 dbar

3.3.2. Temperature sensor calibration

The operator enters the calibration values. Temperature is calculated by means of a polynomial
interpolation against a calibration curve.
Temp °C = a + bx + cx 2
where:
x = temperature sensor reading in ADC counts
Three coefficients "a", "b" and "c" must be entered. After the "temperature sensor" has been selected,
typing its index code at the data entry prompt, the CTD shows the following messages:
Temperature sensor calibration
Enter coeff.. x=a+bx+cx2
a = -0.304912
b = 0.0078532
c = -0.1289741e-12
The operator can confirm or modify the above coefficients. Typing an <ENTER> key confirms the
shown coefficients, while, typing new values followed by an <ENTER> key modifies the previous
coefficients.
(a)=:-0.304912 <
(b)=:0.0078532 <
(c)=:-0.12897e-12 <
Once the last coefficient has been confirmed or modified, the CTD shows the sensor calibration menu
again.

3.3.3. Conductivity sensor calibration

After the "conductivity sensor" has been selected, type its index code at the data entry prompt and the
CTD shows the following message.
Conductivity is calculated by means of a polynomial interpolation against a calibration curve.
Cond mScm -1 = a + bx + cx 2
Where:
X = Conductivity sensor reading in ADC counts
Message from CTD
Conductivity
Enter coeff.. x=a+bx+cx2
a = 0.0000987
b = 0.0011187
c = 1.659832e-13
IDRONAUT – Brugherio (MB)
OCEAN SEVEN 304Plus CTD
23
12-2015