SIAM DU-1, Operating Manual

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Well sounders «DU-1»
6. ENSURING EXPLOSION-PROOFNESS OF THE
PRODUCT.
6.1. Explosion-proofness of the device is provided by the type of
protection "intrinsically safe electric circuit" “ib” level, according to the
requirements of GOST 31610.11-2014 (IEC 60079-11:2011), which is
achieved by the following:

Basic circuit diagram includes the protective component
“Fib”. The protective component “Fib” is an intact spark protection unit
with the short-circuit current limitation at 2.25 A (maximum), using
current limiting resistors and semiconductor fuses in series. Double
redundancy is used in the “Fib” protective component to ensure greater
reliability. The “Fib” component is integrated into the battery compartment
of the device. The design of the protective component “Fib” is met with the
requirements of GOST 31610.11-2014 (IEC 60079-11:2011), including
leakages and clearances. The minimum width of conductors on the PCB is
0.2 mm, copper thickness is not less than 18 µm. Thus, the electrical circuit
coming out of the battery compartment of the device is intrinsically safe.

The electrical circuit principal and applied third party
components provide maximum power consumption not more than 0.45
W from the internal battery with maximum possible voltage on it 4 V.
The total maximum capacity of the electrical circuit is 380 μF,
maximum inductance is not more than 20 µGn. The maximum current
in the circuit during normal operation is not more than 100 m.

The well sounder uses Boston Swing 5300 battery cell.
The battery has special made contacts which exclude the possibility of
its incorrect switching on (polarity reversal) and is located in the
internal battery compartment of the device. The design of the battery
compartment ensures that the battery does not fall out of the device. Do
not replace the battery and do not charge it in the hazardous area. For
this reason, in order to inform the user about special conditions of use