Heath Consultants Gasurveyor 500 Series - Manual (Page 38)

GASURVEYOR 3-500 USER HANDBOOK
28
Calibration Validity
Calibration validity is the responsibility of the user. Under
normal operating conditions a 12 month period can be
expected. This is no guarantee, however, as the precise
application of the product is unknown to GMI. Individual
codes of practice may dictate shorter periods.
Regular checking establishes a pattern of reliability and
enables the calibration check period to be modified in
line with operational experience. The higher the risk, the
more frequently calibration should be checked.