Thermal mass flowmeter 8Q3B
for gasfor liquidsDN25 - 1"

thermal mass flowmeter
thermal mass flowmeter
thermal mass flowmeter
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thermal mass
for liquids, for gas
Pipe diameter
DN25 - 1", DN250 - 10"
4-20 mA, RS485, PROFIBUS
Supply voltage
Protection level
ATEX, IP67, IP66, IP69
industrial, for custody transfer
Other characteristics
compact, remote, with LCD display
Process temperature

Max.: 205 °C
(401 °F)

Min.: -196 °C
(-321 °F)

Process pressure

100 bar
(1,450.38 psi)


0.05 %, 0.1 %, 0.25 %


Promass Q 300 provides the highest measurement accuracy for mass flow, volume flow and density. Being the preferred choice for custody transfer applications, it has also been optimized for liquid applications where entrained gas is known to be present. The compact transmitter offers high flexibility in terms of operation and system integration: access from one side, remote display and improved connectivity options. Heartbeat Technology ensures safe processes. Measuring principle operates independently of physical fluid properties such as viscosity or density Highest measurement performance for custody transfer, density and under tough process conditions Device properties Mass / volume flow: measurement error ±0.05 % (opt.) (PremiumCal) Density: measurement error ±0.1 kg/m³ (opt.) High turndown due to low pressure loss/zero point Compact dual-compartment housing with up to 3 I/Os Backlit display with touch control and WLAN access Remote display available Benefits Secured measuring quality – unmatched accuracy of mass flow, volume flow and density Optimized performance for liquids with entrained gas – MFT (Multi-Frequency Technology) Fewer process measuring points – multivariable measurement (flow, density, temperature) Space-saving installation – no in-/outlet run needs Full access to process and diagnostic information – numerous, freely combinable I/Os and Ethernet Reduced complexity and variety – freely configurable I/O functionality Integrated verification – Heartbeat Technology


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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.