| Specification | What to request | What not to assume |
|---|---|---|
| Fluid | Composition, conductivity, solids, air, treatment chemicals | All water is equivalent |
| Flow | Minimum/normal/continuous maximum/peak with units and duration | Pipe DN determines measuring range |
| Accuracy | Complete expression, flow band, temperature, orientation | A percentage applies at every flow |
| Pressure | Allowable working pressure at temperature; surge conditions | Hydrostatic test pressure is working pressure |
| Temperature | Fluid and ambient ranges, excursions, cleaning temperatures | “Hot” in a filename proves a rating |
| Materials | Body, liner, electrodes, seals and other wetted parts | Housing material describes all wetted parts |
| Connections | Thread type, flange standard/class/drilling, face-to-face length | Same DN means bolts and lengths match |
| Orientation | Approved direction and register position | Every meter can be installed vertically |
| Straight pipe | Model-specific upstream/downstream requirements and permitted disturbances | One 5D/3D rule fits every technology |
| Ingress protection | Sensor, transmitter, module and connector ratings; stated immersion conditions | IP68 means unlimited depth, or covers the whole assembled system |
| Power | Supply, consumption, backup, battery replacement and output limitations | A battery powers every output continuously |
| Diagnostics | Empty pipe, reverse flow, air, tamper and fault behavior | Every alarm is available in every variant |
| Outputs | Exact fitted interface, quantity, scaling and simultaneous availability | “Optional” means included |
| Service | Calibration/test options, spares, access and warranty scope | A removable insert can be changed without further checks |
Some designs permit very short or no straight runs under specified conditions; others need significant undisturbed pipe. For example, KROHNE identifies particular 0D/0D configurations in its range. That is a model claim, not permission to omit straight runs for all mag meters. KROHNE product range