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The next number, 39.2, is the calorific value for conversion. In the UK this is generally always 1.02264, but could differ in your region - it's worth checking the number your supplier uses to calculate your charges, and this should be on your gas bill. The first number below is the volume correction factor, which takes into account atmospheric conditions. I then defined a template sensor to convert my meter reading from m 3 to kWh. I already had the sensor paired with Zigbee2mqtt and had a binary sensor entity in HA called binary_sensor.gas_meter_pulse_contact.įirst I defined some input_number inputs to store my gas meter reading, my unit price (in kWh), and my standing charge (daily fixed charge for gas): input_number:
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I then attached this to my gas meter - picture. (side note - if you don't have access to a 3D printer, I have come across people selling these on eBay in Europe) I found a model on Thingiverse designed to fit around my gas meter that I 3D printed, and I thread my wires and reed switch into it and hot glued it in place. I then soldered the reed switch back on to the ends of these wires - essentially you're just putting it on a big extension lead. I opened up the case and desoldered the built in reed switch, drilled a hole in the outer case and soldered on a couple of wires to the pads previously occupied by the reed switch. I ended up using a Xiaomi Aqara contact sensor for this and it fit the bill perfectly. I'd seen lots of Arduino/esp8266 projects doing this, but I wanted something ultra-low power that would run on batteries for 1 year+, and didn't really have time for a electronics project. This allows you to count the rotations of it to determine gas usage. I have an Elster BK-G4 gas meter that I wanted to monitor, and luckily this meter has a small magnet on the last digit of the meter. Thought I would document this as I've been running it for just over a month now and it's been very accurate and involved minimal work!