Data Sheet

10 Maintenance
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10 Maintenance
10.1 Calibration
The testo 550s / testo 557s is supplied with a factory calibration
certificate as standard.
Recalibration once every 12 months is recommended in many
applications.
This can be carried out by Testo Industrial Services (TIS) or other
certified service providers.
Please contact Testo for further information.
10.2 Cleaning the instrument
Do not use any aggressive cleaning agents or solvents! Mild household
cleaning agents and soap suds may be used.
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If the housing of the instrument is dirty, clean it with a damp cloth.
10.3 Keeping connections clean
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Keep screw connections clean and free of grease and other deposits;
clean with a damp cloth as required.
10.4 Removing oil residues
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Carefully blow out oil residues in the valve block using compressed
air.
10.5 Ensuring measuring accuracy
Testo Customer Service will be happy to help you as required.
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Check the instrument regularly for leaks. Keep to the permissible
pressure range!
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Calibrate the instrument regularly (recommendation: once a year).