FLEXIM is the industry leader in high quality BTU metering

BTU metering is serious business – it is a billable utility that must have a high accuracy utility grade measurement

Flexim’s thermal energy meter is a single device  which measures Flow, Supply and Return Temperature, and calculates Thermal Energy in BTU’s or Tons according to the EN 1434 standard.  Many other types of BTU meters have multiple instruments connected together, which creates a higher cost of installation, configuration complexity, and errors associated with components that are not always well suited to thermal energy measurement. Unmatched Class A & B RTD’s are often used, these according to IEC 751 are only accurate to .25oF & .55oF. Flexim delivers certified accuracy of 1% flow measurement with 0.03oF temperature delta accuracy. All this is done without the need to cut into the piping, with clamp-on flow and temperature sensors, reducing cost of installation and increasing reliability.

Clamp-on metering made reliable

Clamp-on meters use grease couplant to help the signal travel from the transducer into the pipe. In 2005 Flexim introduced a non-grease permanent coupling pad that is good to 400oF. Since that time, with a history of thousands of installed meters, there has no longer been a need to maintain failed meters due to couplant failures. The meters are now 100% maintenance free; this means your facilities personnel have more time for other important activities. 

Low Flow capability beyond any other device

It’s not uncommon that flow meters used for BTU submetering have inadequate low flow sensitivity – this undetected flow is unmetered “free energy”. Often BTU systems do not balance well and billing is lost as a result. You don’t realize you have this problem until it’s too late and the meters are in place. Flexim can meter down to 0.03ft/sec velocities reliably – this is below the drop-out point of other meters. Some meters cannot detect flow below .3 - .7ft/sec. Are you losing revenue with one of these meters? 

FLEXIM’s premier BTU meter is distinguished by these attributes

  • NIST traceable 1% “wet flow calibration” – certificate included
  • NIST traceable matched temperature accuracy 0.03oF – certificate included
  • Low Flow capability 0.03ft/sec (beyond other meter types)
  • Solid coupling pad – “no maintenance”
  • Communication protocols – Modbus RTU, Modbus TCP, BACnet MSTP, BACnet IP, 4-20ma, 0-10v, pulse relay 
  • High installed base (references), Institutional (universities), Commercial, Government
  • Excellent support – Service, installation & calibration

FLEXIM Financial Services offers renting and leasing options complete with FLEXSource Monitoring – installation and service on all finance plans.

FLEXSource Monitoring Services provides you with a thorough evaluation of your metering needs along with a tailored solution to meet your meter’s objectives.

FLEXSource provides you with end-to-end solutions for your measuring needs. Your program will be professionally managed by industry experts who are devoted to upholding the highest standards for reliability and accuracy. Our bundled solutions offer a comprehensive program that will deliver precise results.

Whether you are looking to buy, rent, or lease equipment, FLEXIM has a plan that will meet your needs.

Lease and rent financing provides your business with a source of funding that is separate from your bank, lines of credit, credit cards and cash. Leasing is a great way to secure the measuring equipment needed to improve your building’s or plant's operational efficiencies.

FLEXIM Services and Warranty are included on all Lease and Rent Options!

FLEXIM Leasing & Renting Benefits

  • Prevents Technological Obsolescence
  • Budget Saving Payment Plans
  • Preserves Cash Flow and Credit Lines
  • Tax Advantages through Leasing - receive tax write-offs via Section 179 Deduction
  • Leave the Metering to the Experts

FLEXSource Includes

  • Walk-through
  • Site Survey
  • Commissioning
  • On-Site Training
  • Yearly Calibrations

Program Features & Advantages

  • Flexibility in purchase size
  • Terms that meet specific business needs
  • Renting includes 2 & 3 year options
  • Leasing includes 3,4, & 5 year options
  • Easy monthly payments for a fraction of equipment costs
  • End of lease term options available: buy out / renew lease
  • FLEXSource and Equipment Warranty provided with all plans

Learn more about FLEXIM Lease to own and Financial Services here.


Technical Specification FLUXUS F70x
application/pdf, English (US), 719.59 KB
Technical Specification FLUXUS F601
application/pdf, English (US), 790.46 KB
FLUXUS® Energy
application/pdf, English, 2.02 MB
FLEXIM Sustainability
application/pdf, English (US), 3.78 MB