5.1 - Maintenance planning and quality assurance
82
TCT-2301 Service instructions
M2007/3en
©BTG 2004
5.1.2
Calibration recommendations
Calibration recommendations regarding comparison to lab samples and
previous calibrations.
Twice per year:
Transmitters used for simpler measurements, e.g. for indicating
purposes
Every month:
Transmitters used for measuring/control function of vital impor-
tance to the process
Once a week or after a considerable change of process variables:
Transmitters used for measuring/control function of vital impor-
tance to the process or used for debiting purposes
!
The above recommendations are intended as a general guide and
should be adapted based on actual experience.
5.1.3
Maintenance of the transmitter
Maintenance needs will depend on the transmitter position, media influ-
ence, and ambient conditions.
Regular maintenance
includes:
•
Cleaning the measuring gap.
•
Inspection of wetted rubber details and metal parts for damage twice
per year if exposed to aggressive chemicals.
Long-term maintenance includes:
•
Replacement of seals, typically after 5 years of operation.