Teledyne 3010PAC - Split architecture percent oxygen analyzer (EU - CENELEC) - Manual (Page 69)

Oxygen Analyzer Part II: Analysis Unit
Part II: 3-3 Teledyne Analytical Instruments
3.5 Intrinsic Safety Barriers
Two intrinsic safety barrier strips (one each P/N B366 single channel,
B367 dual channel) are installed between the cell and the control unit. The
barrier strips are housed in an approved bulkhead mountable barrier box
(P/N E324). Refer to drawing D66191 for terminal connection.
Figure 3-4: Control Unit (CU) to Analysis Unit (AU) Connector Cable