GE Healthcare B30 User's Reference Manual page 35

Using two modules
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Figure 2-10 Using two modules
NOTE: You can use one E-PSM(P)W and/or one N-Fx module in the monitor at a time.
To install an E-PSM(P)W and an N-Fx module:
1. Insert the N-Fx module first, see
2. Attach the E-PSM(P)W to the N-Fx.
"Inserting and removing a module" page 2-8.
System description
2-9