8
It is advisable to accept the calibration even
though it displays 20 ppm. This will reset the
calibration due timer.
Switch off the device if the calibration was
incorrectly performed. Do not press the select key
.
To prevent incorrect calibration, only the readings
within the range of 16-24 can be calibrated. An
‘Er’ (Error) message will be displayed if the
calibration is accepted for reading outside this
range.
8. Switch off the device; wait for a minute and it is
now ready for use.
If the device is not calibrated for six months, the device
will beep three times before countdown starts and will
display ‘Cd’ (Calibration due) for 3 seconds. Thereafter
the device will operate as normal but the reading will not
be guaranteed.
