2 x EDL21 Sensor Connection HOW TO?

Hi,
i have 2 Weidmann Elektronik IR Reader on two ISKRA 691 Smart Meters connected to the RASPBERRY PI. The Problem is, that i don´t know how to integrate the second IR reaader with the YAML.
sensor:

  • platform: edl21
    serial_port: /dev/ttyUSB0

May someone give me an advice how to setup yaml?
Thanks for help