Automatic well sounder “DUA-1”
12
"X" sign indicating special conditions of safe operation.
The maximum temperature of overheating of components and
connections in the circuit diagram during normal operation is 15 °C max.
Thus, the surface temperature of conductors and elements during operation
and at maximum operating temperature plus 50 ° C is not more than 65 °
C. Device enclosures are made with the degree of protection against
external influences not lower than IP54 according to GOST 14254-2015.
2.3. Measures to ensure and keep the device explosion-proofness
during the assembly, disassembly and repair of the device.
2.3.1. Measures to ensure explosion-proofness
before the
production process:
- The elements used in the protective component of “Fib” are
subjected to an acceptance test:
- resistors are tested for their nominal resistance;
- the fuses are checked against the short-circuit current limit;
- Materials used for casting the protective component “Fib”
are subjected to an acceptance test according to the certificates
presented.
2.3.2. Measures to ensure explosion-proofness
during production:
- The protective component “Fib” with the installed battery is
subjected to an outgoing inspection:
- the short-circuit current and open circuit voltage at the output of
the protective component are checked;
- visual inspection of the filling location is carried out in order to
confirm the absence of any foreign inclusions, bubbles, cracks or
stratification.
2.3.3. Measures to ensure explosion-proofness
during operation:
- Check that the cover of the battery compartment and the
compartment itself (including the threaded connection) are free from
mechanical damage and corrosion. In case of corrosion or mechanical
damage, do not operate the device;
- meet the requirements specified by the "X" sign in the explosion
proof mark.
2.3.4. The "X" symbol in the explosion proof marking indicates
special conditions for safe operation:
