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2.1 Maintenance limitations
Operation of the device should be carried out under the influence of factors and taking into
account the parameters of the monitored objects in accordance with the specified technical
characteristics. The device must be used within its technical characteristics.
Signal intensity of radio noise at the device location area should not exceed values, which can set
out the flaw detector by generating voltage in the device amplifier input: when this voltage is exceeds
a half value of maximal sensitivity.
In case of high signal intensity of radio noise, the device location area should be shielded from
external electromagnetic field.
Only qualified personal, familiar with the operation manual is allowed to use this device.
After transporting the device at temperature below zero to the place of operation and bring it into
the room with a positive temperature - it is necessary to keep the device in its package for at least 6
hours in order to avoid failure due to condensation of moisture
2.2 Preparing the device for use
2.2.1 Visual inspection
Carry out visual external inspection of the device; make sure that there are no mechanical
damages to the electronic unit, the probe, the connector and the connecting cable.
2.2.2 Charging the battery
To charge the battery, user must connect the device charger from the standard delivery set to the
USB port on the right side of device housing. During charging the device can be used.
Full battery charging time - 14 hours. Always look after device when charging. Also, the device
can be charged by PC connection.
If you do not use the device you should charge the batteries at least once per two months to avoid
batteries from failure.
2.2.3 Selection the probe
2.2.3.1 Testing of castings
Main types of defect in castings – gas cavities, shrink holes, slag inclusions. They are volume
discontinuities. These defects are well determined in any scanning angle. As a rule, castings have
coarse-grained structure and high heterogeneity of grains throughout the whole product. There is often
structure-born noise while casting is scanning – plenty of echo-signals from grain boarders. Straight
beam probes with rather low frequency are applied to avoid structure-born noise.
2.2.3.2 Testing of flat products, sheets, plates
Flat products, sheets, plates are made from castings by hot plastic deformation – rolling or
stamping. Main product defects – delamination, hairlines, folds, cropping out cracks in case of
technological process disruption. Besides, crack is the main operational defect.
Determination of delamination, hairlines, folds and so on is provided by straight beam probes.
Determination of cropping out cracks is made by angle beam probes (single or dual element). It is
better to use probes with entry angle 40 – 50 degrees, then angle reflectors (cracks) will send echo-
signals of high amplitude. Recommendations as for angle beam probes are in Table 2.1.
Ultrasonic Flaw Detector NOVOTEST UD3701
2 UNTENDED USE
Operation manual
Page 26
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