- Purpose: Are you billing for consumption, monitoring usage, controlling a process, measuring a batch or calculating heating/cooling energy?
- Water: Is it drinking water, raw water, treated effluent, sewage, low-conductivity purified water, hot water or a water/glycol mixture?
- Hydraulics: What are the minimum, normal and maximum flows? Will the pipe stay full? What pressure loss can the system accept?
- Installation: What are the temperature, pressure, connection, orientation, available space, power and environmental conditions?
- Data: Do you need a local reading, a building-management connection, remote billing, alarms or a control signal?
A useful buying rule: shortlist the measuring technology first, validate the size and operating range second, and choose the data system third. Check the complete supplied configuration before comparing prices.