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4. SAFETY INSTRUCTIONS
4.1. Persons who have studied sections 2-5 of this
operating manual, as well as those who have received
instructions on safety and fire safety when working with
electrical installations, are allowed to operate, maintain and
repair the stress indicator.
4.2. Replacement of elements of the electrical diagram
of the stress indicator at the setup stage should be carried out
when the power supply voltage is switched off.
4.3. When working with the stress indicator, the
requirements of the
Rules of technical operation of electrical
installations of PTE-84 consumers
and
Safety rules for the
operation of electrical installations of PTB-84 consumers
must
be met.
5.
PREPARING
THE
METAL
STRESS
INDICATOR FOR WORK
Preparation for work includes preparation of the stress
indicator, the magnetizing device and preparation of the
inspected metal surface of a steel product, a metal structure.
5.1. Before turning on the stress indicator after
transporting it in cold weather, it under normal conditions of
use for at least 2 hours.
5.1.2. Attach to the battery compartment freshly
charged battery type PP3, with respect to the polarity of the
contacts.
5.1.3. Connect the
sensor
to the electronic unit using the
connector by inserting the cable part of the connector into the
instrument part of the connector until it stops.
5.1.4. Turn on the stress indicator by pressing the
power button. In this case, the stress indicator screen should
light up, where the service information first appears, then the
value of the measured signal of the Sensor is set (see section
3.4.2 of current document).
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5.1.5. In low light conditions, to improve the visibility
of the stress indicator screen, turn on the screen backlight
button.
5.2. Preparation of the magnetizing unit consists in
external inspection and cleaning of the surface of the magnetic
pole from stuck metal particles and dirt. To do this, use a rag.
5.3. Preparation of the controlled metal surface of a
steel product or metal structure consists in pre-cleaning it from
insulation, dirt, oil, and stuck metal particles. To do this, use
an appropriate hand or electric tool, rag, sandpaper, or file.
6. OPERATING PROCEDURE
6.1. Measuring the mechanical stress of metal of
steel parts and metal structures
Measurement of the mechanical stress of the metal of a
steel product or metal structure consists in preliminary
magnetization of a local section of metal by a constant
magnetic field of the magnetizing device and measurement of
the field strength of the residual magnetization over this
surface.
6.1.1. Install the pole of the magnetizing device on the
local area of the metal surface of the steel product, metal
structure and smoothly remove it from the magnetized surface
in the vertical direction.
Note: lateral displacement of the magnetic pole of the
magnetizing device is not allowed to reduce the accuracy of
measurements.
If the magnetic pole is allowed to shift laterally on the
metal surface when the magnetizing device is removed, repeat
the magnetization operation in accordance with step 6.1.1.
6.1.2. Install the stress indicator sensor in the middle of
the magnetized area of the metal surface.
