TESTO Saveris 2 H2, Commissioning Instructions

Page: 86 / 120

7 Maintenance
86
7.4
Calibration and adjustment
Calibration
Is the comparison of a reading with the correct value under specified
conditions. This includes documentation of the deviation, calculation of
the measurement uncertainty and creation of the certificate. Calibration
does not include adjusting the measuring instrument.
Adjustment
A measuring instrument is used to measure a correct, known value
(confirmed by a superordinate body). The instrument is then adjusted to
this value.
All Saveris data loggers are adjusted in the factory, which is confirmed by the
corresponding adjustment report. Calibration certificates can be ordered
separately.
For consistently reliable data, we recommend carrying out data logger
calibration and, if necessary, adjustment at regular intervals, e.g. once a year.
This can be carried out on or off site.
7.4.1 On-site calibration and adjustment
The Saveris adjustment software (order no. 0572 0183) is required for this.
Advantages: calibration while the system is running and easy documentation by
adding a note, along with importing of adjustment data
Disadvantages: accuracy or comparability of the reference system’s
measurement data.
After successful correction, the current adjustment data are stored in the data
logger. At the same time, the adjustment software generates an adjustment file
that can be imported into the testo Saveris software.
Ensure that an external humidity probe always remains attached to the
Saveris radio or Saveris Ethernet data logger with which it was
adjusted. Does not concern the testo Saveris 2 H2 data loggers.
7.4.2
External calibration and adjustment
Advantages: accuracy, through separate measurement as per a suitable
calibration standard, e.g. in a climate cabinet.
Disadvantages: Saveris data logger must be removed from the system which is
in operation.
Two different procedures may be used to carry out external calibration and
adjustment.