Technical Sourcing & Field Services | AMAC Group
Thermal Mass Flowmeters for Gas, Compressed Air & Large Ducts
Thermal mass measurement is a major industrial category for compressed-air management, combustion-air systems, air ducts, wastewater aeration, process gas and stack flows. AMAC reviews insertion and inline measurement, OEM Kurz model identification and technical service packages for Saudi plants and EPC contractors.
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Thermal mass flow: principle and applications
The heated sensor is cooled by gas motion; the measured heat-transfer response is correlated to mass flow or defined standard gas volume. Unlike a simple water flow sensor, a thermal gas sensor is configured for a specific gas or mixture and reference conditions. This technology is useful for suitable clean, dry air/gas and large ducts, but unstable gas mixtures, condensation and deposits can undermine calibration and repeatability.
Kurz model families for technical identification
| OEM reference | Configuration / duty | RFQ information |
|---|---|---|
| Kurz 454FTB | Single-point insertion thermal mass; air, gases, combustion and utility duties | Insertion length, process connection, flow velocity range, gas composition and temperature |
| Kurz 454FTB-WGF | Specialized variant for designated wet/condensing gas applications | Exact medium, humidity and OEM suitability; do not substitute conventional dry-gas sensors |
| Kurz K-BAR 2000B | Multipoint sensing across wide industrial ducts/stacks | Duct width, probe/support arrangement, sensor quantity, assembly length and installation clearance |
| Kurz 504FTB / 534FTB | Inline thermal mass family references | Exact model code, line DN, connections, outputs and calibration gas |
| Other thermal or alternative technologies | Compressor room air, flare/process gas or large stack | Select by composition and legal/emissions requirements |
Compressed-air measurement
Define whether the target is compressor discharge, dryer outlet, branch line usage, leak monitoring or mass/normalized volume reporting. State pressure, temperature, humidity, flow rate in kg/h, Nm³/h or SCFM and the exact reference conditions. A change in gas composition or moisture may be an additional uncertainty, not automatically a sensor fault.
Combustion air, ducts and gas lines
- Round/rectangular duct dimensions, traverse/profile quality and accessible straight section.
- Thermal sensor insertion length, nozzle size, cross-duct support and vibration requirements.
- Gas mixture for boiler flue gas, process gas, flare gas, wet gas or ambient combustion air.
- Sensor range in mass flow, standard volume or velocity; define reference P/T for SFPM/Nm³/h.
- Site explosion/heat classification, ambient and process temperature, output protocols, maintenance access.
- For large non-uniform duct profiles, evaluate multipoint K-BAR versus single-point insertion uncertainty.
Gas fiscal measurement is a different duty
Commercial natural-gas custody transfer may require an ultrasonic, turbine or DP primary meter, a properly configured flow computer, gas chromatograph/composition information, pressure and temperature correction and approved measurement standards. A thermal mass probe must not be substituted for an accepted fiscal metering train by assumption.
What to send to AMAC for a quotation
- Exact gas composition (and mixture variation), moisture/dewpoint and pressure/temperature
- Pipe bore or duct dimensions, insertion/support configuration, velocities or Nm³/h
- Single-point/multipoint, process connection, flow-direction and installation profile
- Kurz full part number if replacement, electronics/enclosure, analog/digital outputs
- Ex/temperature requirements, field service and diagnostic scope
- Quantity and Saudi end-user project specifications
Technical quotation and field review
AMAC can review a complete instrument or project RFQ, including OEM replacement identification, site survey, installation, wiring, calibration or commissioning scope where applicable. Submit the instrument index, BOQ, data sheet and required end-user approvals.
sales@amac-group.com · +966 53 217 2711 · online contact form
OEM products are mentioned for engineering identification only; references are not proof of AMAC authorization, inventory, compliance or pricing. Final model, approvals, availability and delivery are established by supplier confirmation and the accepted quotation.
Further reading and related products
All flow technologies · Flow computers · Gas analyzers · Calibration and service