code: def read_bin_particle_density(self):
          
          config = []
  
          # Send the command byte and sleep for 10 ms
          self.cnxn.xfer([0x33])
          sleep(10e-3)
  
          # Read the config variables by sending 256 empty bytes
          for i in range(4):
              resp = self.cnxn.xfer([0x00])[0]
              config.append(resp)
  
          bpd = self._calculate_float(config)
  
          return bpd
docs: Read the bin particle density
  
          :returns: float