YEO-KAL 615, Руководство пользователя, Страница: 29 / 48

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Calibration
Calibration order to ensure the accuracy of the YK615, the instrument needs to be
calibrated on a regular basis as well as after any maintenance has been performed on
the probe. The frequency at which calibration is required will depend on the specific
application for which the instrument is to be used. The optimum time between
calibrations can be established by regularly checking the performance of the instrument
in standard solutions. If the YK615 is kept well maintained and calibrated on a regular
basis, a single point calibration is sufficient to keep the instrument performing to
specification. However, two point calibrations whenever a sensor has had any
maintenance.
The calibration procedures require that the probe be immersed in standard solutions.
The probe storage container which is supplied with the YK615 is ideal for this purpose as
it provides a water tight seal on the probe and minimizes the volume of standard
solution required (about 150 ml). Make sure that you rinse both the probe and
container before each calibration and between each calibration solution. The standard
solutions are available from YEO-KAL Electronics Pty Ltd or most major scientific
suppliers.
Both dissolved oxygen and conductivity measurements require a correction for
temperature (this correction is automatically made by the instrument) hence the
temperature sensor must be correctly calibrated before you can calibrate either the
dissolved oxygen or salinity / conductivity sensors.
To enter the calibration menu, press the CAL key . Three choices will appear on the LCD
display for all sensor calibrations:
1. Out cal constants
This function allows the operator to down load the current 615 calibration constants
data to a PC. and saved for further analysis. A serial cable need s to be connected to the
PC serial port and the other end of the cable plugs into the serial bulk head connector on
the 615.
2. In cal constants
As mentioned in 1. The calibration constants can be up loaded back into the 615 If the
instrument has been calibrated incorrectly the saved data files may be edited and up
loaded back into the 615 and the already stored data can be corrected while down
loading it into a PC.
3. Calibrate Inst