5 SENSOR CALIBRATION
This section provides general information about how the probe manages and keeps the sensor
calibration coefficients stored and describes the functions available in the "Calibration Menu". The aim
of the “Calibration Menu” is to allow the operator to carry out the calibration procedures needed by
any sensor installed. The aim of the calibration information is to define the coefficients and the
mathematical procedure needed by the probe to convert the ADC counts acquired from a particular
sensor into engineering units like: ppm, mS/cm, °C, dbar, etc..
5.1 CALIBRATION STORING LAYOUT
Information on calibration is stored in a non-volatile memory, which can keep up to 48 calibration
records. Each record is associated to a sensor. When a cast is stored in memory a copy of the sensor
calibrations is automatically stored with the data. Calibration is retrieved when the cast data is shown
or uploaded. This means that stored casts can have different calibration records associated to the same
sensor.
The items stored for each calibrated sensor are:
❖ Calibration date & time.
❖ Calibration status.
❖ Index of the stored cast, if any.
❖ Index of the sensor configuration.
❖ Sensor logical code.
❖ Number of coefficients or/and degree of polynomial.
❖ Polynomial coefficients or calibration values.
5.1.1 Parameter/Sensor logical codes
The management firmware uniquely identifies a derived parameter or sensor among the others by
means of a predefined logical numerical code. The most common logical codes can be found in
document describing the “Ocean Seven 3xx Data Transmission protocol” document.
5.2 CALIBRATION GLP (GOOD LABORATORY PRACTICE)
The Ocean Seven 310, according to the GLP European directive: “Good Laboratory Practice (GLP) embodies
a set of principles that provides a framework within which laboratory studies are planned, performed, monitored,
recorded, reported and archived. These studies are undertaken to generate data by which the hazards and risks to
users, consumers and third parties, including the environment, can be assessed for pharmaceuticals (only
preclinical studies), agrochemicals, cosmetics, food additives, feed additives and contaminants, novel foods,
biocides, detergents etc.... GLP helps assure regulatory authorities that the data submitted are a true reflection of
the results obtained during the study and can therefore be relied upon when making risk/safety assessments”
keeps trace of the calibrations carried out on the sensors.
The stored calibration information can be then used by the operator to further analyze the sensors
behaviour with the passing of time. The OCEAN SEVEN 310 keeps up to 1024 calibration log records.
Each calibration log record registers, apart from the date and time of calibration, the most important
information about the status and calibration coefficients of a sensors.
5.3 SENSOR CALIBRATION FUNCTIONS
The "Calibration Menu" is displayed on the user’s terminal by selecting: <CALB> from the "Main Menu".
The following menu is displayed:
OCEAN SEVEN 310 - ID:0317003 {USR}(1.0_10 05/17)Jun 13 10:44:38.27 2017
Calibration menu
<0>[CAUP] - Leave calibration menu
<1>[CASE] - Calibrate sensors
<2>[CALO] - Calibration log
Selection of the desired function is performed by typing one of the acronyms contained in the square
brackets, or by typing the number between the <> brackets. By pressing the <ESC> key or [CAUP]
command, the programme returns to the "Main Menu”, while, pressing the <ENTER> key re-displays
the "Calibration Menu".
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