draw- backs of weed-relay pulsers

English to Spanish Tech/Engineering Mechanics / Mech Engineering water-meter

Buenas!

Está hablando de módulos de radiofrecuencia que permite la medición inalámbrica del uso del agua. Contexto:

The RF modules type AT-WMBUS-16-2, type AT-WMBUS-16-2a with incre- ased battery capacity and type AT-WMBUS-16-2-1 with extended RF anten- na circuit are intended for wireless transmission of metering data over the Wireless M-Bus communication protocol. The data can be received from the modules with RF receivers which support Wireless M-Bus mode T1 or T2. The device can be configured in mode T2 only.
The optical scanning of the counter reflective indicator eliminates the draw- backs of weed-relay pulsers, while assuring reliable and accurate reading

Y mi intento de traducción: --- los retrocesos del generador de impulsos del relé "weed"?? No sé por dónde pillar weed...

Gracias!!