flowmeter on usb 6009 (connections)

Hello,

I am using a flowmeter (attached) on a USB 6009. The wiring connections (3 wires from flowmeter) are:

Sig ground to GRD of the module

+Vdc to the +5V of module

Signal output to the PFI0 of module.

This configuration was already fixed (it works fine with the labview program) by a previous staff member no longer available. 

The question is, in case I get one more flowmeter like this, is it possible to connect it on the same module?? What the wiring connections could be in this case??

 Thank you in advance!