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We have measured the cosmic ray absolute flux and its variations caused by the ldquoday-nightrdquo and the ldquobarometricrdquo effects, by using a telescope of resistive plate chamber (RPC) detectors. Because of the high sensitivity needed for this measure, the RPC behaviour must be very well controlled and all the influences induced by the environmental parameters, must be compensated. For this purpose we introduced, among others features, an alternative method for the stabilization of the RPC working point. We present here all the results for both aspects: the cosmic ray flux measurements, the barometric effect and a description of the RPC stabilization method used.