Vaisala GM70 - Manual (Page 47)

Chapter 10 _____________________________ Calibrating and Adjusting the Probes
VAISALA __________________________________________________________ 47
CHAPTER 10
CALIBRATING AND ADJUSTING
THE PROBES
This chapter contains information on calibrating and adjusting the
probes.
In this user's guide the term calibration means comparing detector's
reading to a reference concentration. In adjusting, which is usually done
after calibration, the reading of the detector is changed to correspond to
the reference concentration.
After adjustment, the original calibration certificate shipped with the
product is not valid anymore.
Calibration Interval
The GM70 is fully calibrated and adjusted as shipped from factory. The
recommended calibration interval is two years. However, calibration
should always be done whenever there is reason to believe that the device
is not within the accuracy specifications. The length of the suitable
calibration interval may vary depending on the conditions and frequency
of use.
Factory Calibration and Adjustment
It is recommended to send the GM70 probe to Vaisala Service Centers
for accurate calibration and adjustment, see section Product Returns on
page 60.