TechnipFMC Smith Meter microLoad.net - Figure 12. Wiring Diagram, Typical Metered Injector

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Section IV – Diagrams
Figure 12. Wiring Diagram, Typical Metered Injector
The Pulse input circuitry has 1.6 kΩ of correct limiting resistance “built in” so that an external pull-up resistor is not required
when an open collector output device is connected as shown.