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Frequently Asked Questions
Flow or energy - which is being measured?
Flow is a volume passing a point.
Energy is that flow with the temperature difference.
An energy meter is a flow meter plus two sensors.
Only energy answers what a tenant used.
Only flow answers whether a branch is balanced.
Asking the wrong one produces a useless meter.
What are the three purposes and why do they differ?
Billing, commissioning and control.
Billing needs legal certification and sealing.
Commissioning needs accuracy at one moment.
Control needs speed and repeatability.
Each implies a different instrument.
State the purpose before comparing products.
Can one meter serve all three?
Rarely well.
A billing meter is expensive and slow for control.
A control sensor is not defensible for billing.
Disputes are decided on certification.
Some meters output both for convenience.
Confirm the certified output is the one billed.
Why does straight pipe matter so much?
Every flow measurement assumes a settled profile.
Bends and valves disturb it.
A meter fitted after one reads confidently and wrongly.
Manufacturers publish required upstream lengths.
It cannot be corrected without cutting pipe.
Put the requirement on the drawing.
What certification applies to billing meters?
Legal metrology rules, varying by jurisdiction.
Approval, sealing and periodic verification are typical.
Verification intervals are set in law.
An expired meter may not be billable.
Confirm the local position before purchase.
Budget the recertification, not just the meter.
Where should meters be installed for a tenanted building?
At the boundary of what is being charged for.
That is a commercial line, not a hydraulic one.
Shared risers complicate it considerably.
Decide the metering strategy before the pipework.
Retrofitting boundaries is expensive.
Involve whoever will issue the bills.
What makes a meter distrusted?
A reading nobody can reconcile.
Poor installation is the usual cause.
Wrong sensor positions for energy meters.
Air in the system corrupts flow readings.
Record a commissioning baseline and keep it.
An unverified meter becomes an ignored one.