SIAM DU-1, Operating Manual, Page: 15 / 42

Well sounders «DU-1»
- 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.
6.2.2. 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.
6.2.3. 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.

6.2.4. Measures to ensure explosion-proofness during repair:

- the device must be repaired only by the employees of the
manufacturer.

Repair by third parties or individuals is prohibited.

- the protective component “Fib” is not to be repaired. It is made
intact and must be replaced in case of failure. Repair of the “Fib”
component is not permitted.

- after repair, the device must be tested according to the test
procedure, with the “Fib” component tested for short-circuit current
and open-circuit voltage (together with the battery installed).