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mvip@mitech-ndt.com
Check the capacity of the battery.
7.1.2 Mechanical and electronic checks
The performance check of the unit should be carried out as follows:
In the case of continuous operation, at least once a day or at least after every 1000 impacts
In the case of infrequent operation, before the beginning and at the end of a test series
The performance check is done by measuring the hardness value HL on the test block.
Clean the impact device.
Carry out impacts on a test block at an interval of 3~5 mm (approx. 3~5 impacts).
Read the mean HL and compare it with the hardness value as marked on the test block.
The impact device is working properly when the mean value is within the tolerances of ±6 HLD and the
range R does not exceed 12 HLD. If it deviates from the mentioned tolerances:
Mean value too high or too low:
Change the impact body.
Check the wear and mounting of the support ring and replace it if necessary.
Clean the impact device
If the impact device still shows excessive deviations, do not use the impact device anymore and send it
to the manufacturer to be checked.
7.2 Maintenance
After the impact device has been used for 1000 to 2000 times, please use the nylon brush provided to
clean the guide tube and the impact body. Follow these steps when cleaning the guide tube,
Step1, unscrew the support ring
Step2, take out the impact body
Step3, spiral the nylon brush in counterclockwise direction into the bottom of guide tube and take it
out for 5 times
Step4, install the impact body and support ring when complete.
Release the impact body after use.
Any lubricant is prohibited inside the impact device.
Maintenance of the impact body
To ensure that the impact body is good condition, it should be tested regularly on a test block
(performance check). The impact body is subject to wear and can be easily and economically replaced
by the user (calibration of the impact device is required). The impact body is assembled in a special
manner with critical precision and cannot be repaired.
Standard test blocks
Densely impacted standard test blocks cannot be restored by grinding. Through grinding, the original
hardness is altered in an uneven and uncontrolled manner. Therefore the standard test blocks can
neither be calibrated for a new mean value nor for an acceptable ±tolerance.
7.2 Repair
If the error between the test value and the nominal value is bigger than 2 HRC when testing on the
standard Rockwell hardness block, it may be caused by the abrasion of the impact device tip ball. When
this happens, it is suggested to replace the tip ball or replace the impact body.
When there is some problem with the hardness tester that the operator can’t solve, do not dismantle or
adjust any fixedly assembled parts. Fill in the warranty card and send it together with the tester to us for
repair.
7.3 Transport and storage conditions
Only store the instrument in the original packaging and in a dry room that is as free from dust as possible.
Keep it away from vibration, strong magnetic field, corrosive medium and dumpiness. Store it under
ordinary temperature.
With original package, transport is allowed on the third grade highway.
