17
Calibration
Calibration order is important to ensure the accuracy of the YK801B. The instrument needs to be
calibrated on a regular basis including 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 YK801B is kept well
maintained and calibrated on a regular basis, a single zero point calibration is sufficient to keep the
instrument performing to specification. However, two point calibrations are required whenever a
sensor has had any maintenance.
The calibration procedures require that the probe be immersed in distilled water for zero
calibration. Make sure that you rinse both the probe and container before each calibration. The
standard solutions are available from YEO-KAL Electronics Pty Ltd or most major scientific suppliers.
Note: Zero calibration will overcome offset due to optical obscuration. This the most important
calibration point and should be done in a large black container.
To enter the calibration menu, select
Calibration
in
main MENU
and press
ENTER
. Select the proper
sensor and press
ENTER
again. Then follow the on screen instructions to complete the
calibration(s).
The previous calibrated data can be used again for the current calibration if the data is correct.
Temperature Calibration
The temperature calibration should vary very little over the lifetime of the instrument, however it is
worth checking on the accuracy of your temperature. Temperature calibration is performed at two
temperatures. The low temperature must be between 0
o
and 20
o
C and the high temperature must
be between 30
o
and 50
oC
. A thermometer to at least 0.1
o
C accuracy and resolution must be used.
To calibrate temperature, proceed as follows:
1.
Select
TEMPERATURE
from the
Calibration.
Lo Pt Raw
or
Hi Pt Raw
will appear.
