DC Block

Our DC block barriers are certified as intrinsically safe by the U.S. Department of Labor’s Mine Safety and Health Administration (MSHA) for use with explosion proof housings in a methane environment. 

Stolar’s DC block was designed to act as a high pass filter that isolates the direct current between two AC coupled circuits.  During underground mining operations, MSHA mandates DC block modules as a safety device to prevent a “short” or “open” circuit between external RF antennas and electrical/electronic components which might generate a DC arc sufficient to ignite methane.  The DC Block is triple redundant against failure; a single component failure does not disable the unit’s function. 

 

Specifications:

Model Number	ADCB-000
MSHA Certification/Evaluation Number	IA 21110, 31 January 2000, in accordance with CFR 30, part 18
Operating Voltage	0 - 200 volts DC (rated)
Input Power	10 Watts (maximum)
Frequency Range	100 MHz to 3 GHz*
Input/Output Impedance	50 Ohms, ± 10%
Input/Output Connectors	SMA Female (interchangeable)
Operating Temperature	-30° - 100° C

*Standard frequency range.  3GHz – 5.5 GHz available as a special order

 

 

For more information on Stolar's radio geophysics:LAR@stolarhorizon.com