docs: def get_det_oid(self, det_id):
          """Convert detector serialnumber to string representation (OID)"""
          try:
              return self.detectors[self.detectors.SERIALNUMBER == det_id
                                    ].OID.iloc[0]
          except IndexError:
              log.critical("No OID found for det ID '{}'".format(det_id))
              return None