This is an aftermarket gas meter pulse transmitter (reed contact) compatible with meters: Elster, Kromschroeder etc. (see on the picture) for G1.6, G2.5, G4, G6, G10, G16, G25, G40 sizes.
This pulse transmitter can be installed by non-trained personnel without breaking a seal, and does not contain a magnet. The pulse module can only be fixed in an open transmitter nest.
It is easy to integrate into various readout systems, like ESPhome and HomeAssistant. It provides a switch output after a predefined gas amount went through the meter. The pulse to gas volume conversion is noted on the specific meter.
The pulse module can only be fixed in an open transmitter nest.