A swap that goes wrong is almost always a survey that was skipped. Most retrofit problems are decided before the meter arrives: wrong body size, no shut-down window, or no signal where the meter has to sit.
1 · Survey before you order
Three things decide everything that follows, and all three are cheap to check on site.
- Pipe size and body length. Older pipework mixes sizes unpredictably — confirm the DN at every inlet rather than assuming the block is uniform.
- Shut-down window. How long can the water be off, and how much notice do residents need?
- Signal at the meter. Basement and riser positions are the usual failures. Test where the meter will actually sit, not at the building entrance.
2 · Seating the body
Fit the body in line with the flow direction arrow, and follow the straight-pipe requirement in the sheet that ships with the unit — it varies with size and type, so use the figure for your build rather than a rule of thumb.
- Threaded, DN15–DN40. Household and small-building installs. Hand-tighten the unions first, then finish with a wrench — overtightening a threaded body is the most common way to crack one.
- Flanged, DN50 and above. Compress the gasket evenly across the flange — tighten in a cross pattern, not round the circle. A cocked flange weeps for months and reads low.
3 · Communication and power
Decide the output before installation day, because it changes what has to be reachable at the meter position.
- Pulse or wired output — needs a cable route back to your logger.
- NB-IoT or 4G — needs cellular coverage at the meter, and a SIM plan.
- LoRaWAN — needs your gateway in range, which is worth testing before you commit to a block full of them.
4 · Commissioning
Open slowly, bleed the air, and check for leaks at both joints before you close the box. Then record the starting index — every future dispute gets settled against that number.
5 · What to check afterwards
Once a quarter is enough for most sites: read the index against your platform, look for a stopped or reversed total, and check the position is still dry. In chambers, check for silt and standing water before they reach the register.
What shortens a meter’s life
- Running permanently near the top of the range — a sign the meter is undersized for the line.
- Sediment in the line, which wears mechanical measuring elements first.
- A position that floods, or one where the register sits below the water level after rain.
- An upload interval set faster than needed, which shortens battery life for no gain.