Flow sensors for liquids in stainless steel FVA 645-GVxQT5

Product catalog summary

Overview: The FVA 645-GVxQT5 is a stainless steel flow sensor designed for liquid applications, featuring no moving parts and integrated temperature measurement. It is suitable for systems with laminar flow, without pressure surges, air pockets, or suspended solids.

Key Features:

Stainless steel construction with no moving parts.
Integrated temperature measurement.
Low pressure loss and wide temperature range.
High-speed reaction time, suitable for water.
Designed for heat output measurement in heating and cooling systems.

Flow Measurement:

Principle: Pressure pulsation, Kármán vortex street.
Accuracy: ±1.5% of final value using water at 0 to +100°C.
Reaction time: Less than 3 seconds for 63% of the final value.

Temperature Measurement:

Range: 0 to +100°C.
Accuracy: ±1 K at +15 to +90°C, ±2 K at 0 to +100°C.
Resolution: 0.1 K.
Reaction time: Less than 0.25 seconds under flow conditions for 50% of the final value.

Process and Environmental Conditions:

Process connection: 2x male thread, varies by variant.
Pressure: 10 bar, with typical pressure loss of 0.1 bar.
Suitable media: Water with viscosity < 2 mm²/s and conductivity >2 µS/cm.
Temperature of medium: 0 to +100°C.
Ambient temperature: -25 to +60°C, humidity up to 95% RH, non-condensing.

Electrical Connections:

Output signal: 2x 0.5 to 3.5 V (4.1 V).
Power supply: 5 VDC (±5%), <10 mA via ALMEMO® connector.
Connection: Sensor with 2.9-meter connecting cable and ALMEMO® connector.

Materials:

Corrosion-resistant coating: EPDM, PPS, PPA 40-GF.
Pipe piece: Stainless steel 1.4408, inside pipe PPA 40-GF.

Calibration: DAkkS accredited calibration KV91xx for flow, fulfilling DIN EN ISO/IEC 17025 requirements.

Variants:

1 to 18 l/min, G 3/4" male thread, 110 mm fitting length (Order no. FVA645GV18QT5).
2 to 40 l/min, G 3/4" male thread, 110 mm fitting length (Order no. FVA645GV40QT5).
5 to 100 l/min, G 1" male thread, 129 mm fitting length (Order no. FVA645GV100QT5).
10 to 200 l/min, G 1 1/4" male thread, 137.5 mm fitting length (Order no. FVA645GV200QT5).

Note: The sensor must be directly connected to an ALMEMO® device and cannot be used with extension cables ZA9060VKx or ZA9090VKCx.

Catalog excerpts

Flow sensors for liquids in stainless steel FVA 645-GVxQT5-1

• Measuring section in stainless steel • Application in systems with laminar flow, no pressure surges, no air pockets, no suspended solids • Without any moving parts • Integrated temperature measuring • Wide temperature range • High-speed reaction time • Using with water • For heat output measurement in heating systems and cooling plant Measuring principle Pressure pulsation Karman vortex street Measuring range see variants Accuracy using water as medium at 0 to +100 °C ±1.5 % of final value Resolution see variants Measuring range 0 to +100 °C Accuracy ±1 K at +15 to +90 °C Reaction time (63 %) <0.25 second under flow conditions 50 % of final value Process connection 2x male thread see variants Pressure loss 0.1 bar, typical under flow conditions, Suitable conditions Media Water, Viscosity < 2 mm2/s) and conductivity >2 pS/cm Temp. of medium 0 to +100 °C Ambient temperature -25 to +60 °C Ambient humidity up to 95 % RH, non-condensing Electrical connections Output signal 2x 0.5 to 3.5 V (4.1 V) via ALMEMO® connector Connection Sensor with 2.9-meter connecting cable and ALMEMO® connector Fitting length see variants Materials (in contact with media) Corrosion-resistant coating EPDM, PPS, PPA 40-GF Pipe piece Stainless steel 1.4408; 11/2025 • We reserve the right to make technical changes. ! Note: The sensor can only be operated by plugging DIRECTLY onto an ALMEMO® device. (NOT with extension cables ZA9060VKx or ZA9090VKCx). Variants Sensor for flow rate and temperature over a measured section, including ALMEMO® connecting cable, 2.9 meters Measuring range ALMEMO® Process connection Fitting length Order no. G 3/4“ male thread G 3/4“ male thread G 1“ male thread G 1 1/4“ male thread DAkkS accredited calibration KV91xx, flow, for probes, see chapter „Calibration certificates“. The DAkkS accredited calibration fulfills the requirements of DIN EN ISO/IEC 17025 for test equipment.

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