Inspection And Repair - ITRON MZ Mode D'emploi

5.3 Inspection and repair

It is possible to check the good functioning
of the MZ by applying a spin test . This test
will give information about eventual fric-
tion in the turbine ball bearings .
The test has to be conducted as follow:
• Accelerate the turbine wheel around 30
to 50% of Qmax then to measure the
time until the turbine wheel stops .
• Measure the spin time (ST) until the tur-
bine wheel stops .
See Annex 5 for typical values of spin
time .
The following recommendations have to
be observed for repair:
• In case of use with aggressive or danger-
ous gas, it may be necessary to send a
safety statement with the meter, detail-
ing the type of Gas that has been mea-
sured .
• Some gas may still be present inside the
meter and the pipe; therefore sufficient
ventilation is required .
• Repairs and maintenance must be done
by trained or qualified personal . Afte-
rwards a tightness test with 1 . 1 x PS
(Pmax) must be performed .
• When changing pressure-bearing parts,
ensure that spare parts which comply
with the PED are used .
• If used with wet gas, internal and exter-
nal effect of corrosion has to be checked
regularly and in case of severe corrosion,
the meter must be replaced .
• Use solvent and alcohol free cleaning
product to clean the meter .
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