Maintenance / warranty
VA 521 English V1.20
Page 37 of 39
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Maintenance
The sensor head should be checked regularly for dirt and cleaned if necessary. Should dirt, dust or oil
accumulate on the sensor element, a deviation will occur in the measuring value. An annual check is
recommended. Should the compressed air be heavily soiled this interval must be shortened.
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Cleaning of the sensor head
The sensor head can be cleaned by carefully moving it in warm water with a small amount of washing-
up liquid. Avoid physical intervention on the sensor (e.g. using a sponge or brush). If soiling cannot be
removed, service and maintenance must be carried out by the manufacturer.
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Re-Calibration
If no customer specifications are given then we recommend to carry out calibration every 12 months.
For this purpose the sensor must be sent to the manufacturer.
15
Spare parts and repair
For reasons of measuring accuracy spare parts are not available.
If parts are faulty, they must be sent to the supplier for repair.
If the measuring device is used in important company installations, we recommend keeping a spare
measuring system ready.
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Calibration
According to DIN ISO certification of the measuring instruments we recommend to calibrate and if
applicable to adjust the instruments regularly from the manufacturer. The calibration intervals should
comply with your internal specification. According to DIN ISO we recommend a calibration interval of
one year for the instrument VA 521.
On request and additional payment, calibration-certificates could be issued.
The precision is given due to use DKD-certified flow meters and verifiable
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Warranty
If you have reason for complaint we will of course repair any faults free of charge if it can be proven
that they are manufacturing faults. The fault should be reported immediately after it has been found
and within the warranty time guaranteed by us. Excluded from this warranty is damage caused by
improper use and non-adherence to the instruction manual.
The warranty is also cancelled once the instrument has been opened - as far as this has not been
mentioned in the instruction manual for maintenance purposes - or if the serial number in the
instrument has been changed, damaged or removed.
The warranty time for the VA 521 is 12 months. If no other definitions are given the accessory parts
have a warranty time of 6 months. Warranty services do not extend the warranty time.
If in addition to the warranty service necessary repairs, adjustments or similar are carried out the
warranty services are free of charge but there is a charge for other services such as transport and
packaging costs. Other claims, especially those for damage occurring outside the instrument, are not
included unless responsibility is legally binding.
After sales service after the warranty time has elapsed
We are of course there for you even after the warranty time has elapsed. In case of malfunctions,
please send us the instrument with a short-form description of the fault. Please do not forget to
indicate your telephone number so that we can call you in case of any questions.
