- SI flow sensors
- Select products
SI thermal flow meter | Select products
Sanitary flow sensors from ifm meet the rigorous standards of sanitary applications while offering precision in detecting liquid, gas, and solid flows. Browse our options below, and keep reading for more information on this line of flow sensors.
| Sensor Family | Flow Rate | Line Size | Medium Temperature | Accuracy | Points to Consider |
|---|---|---|---|---|---|
 SI |
3…100 cm/s | 1/8"…8" | -13…176 °F -25…80 °C |
~ ±10% | • Pressure < 4350 psi • Sanitary versions available • Avoid rapid medium temperature changes |
Other solutions for water-based media...
| Sensor Family | Flow Rate | Line Size | Medium Temperature | Accuracy | Points to Consider |
|---|---|---|---|---|---|
 SM |
5 ml/min (0.08 gpm)…160 gpm |
1/4"…2" | 14…158 °F -4...194 °F (units with TFT display) |
~ ±1% | • Conductivity ≥ 20 µS/cm • Totalizer function • Pressure ≤ 232 psi • Versions with TFT display have selectable units of measure |
 SB |
0.1…50 gpm | 3/4"…1-1/2" | 14…212 °F -10…100 °C |
~ ±5% | • No straight pipe runs required • Response time ≤ 10 msec • Pressure ≤ 580 psi |
 SV |
0.26…26.4 gpm | 1/2"…3/4" | 14…194 °F -10…90 °C |
~ ±2% | • Display flow and temperature • Water content ≥ 95% • Pressure rating ≤ 174 psi • Long straight pipe required |
 SA |
0.1…6150 gpm | 1/2"…16" | -4…212 °F -20…100 °C Higher upon request |
~ ±10% | • Pressure ≤ 1450 psi • Avoid rapid medium temperature changes |
Other solutions for oil-based media...
| Sensor Family | Flow Rate | Line Size | Medium Temperature | Accuracy | Points to Consider |
|---|---|---|---|---|---|
 SB |
0.1…50 gpm | 3/4"…1-1/2" | 14…212 °F -10…100 °C |
~ ±5% | • No straight pipe runs required • Response time ≤ 10 msec • Pressure ≤ 580 psi • Oil viscosity ≤ 46 cSt |
 SU |
0…52.8 gpm | 1/2"…1" | 14…176 °F -10…80 °C |
~ ±5% | • Totalizer function • Pressure ≤ 232 psi • Oil viscosity ≤ 68 cSt |
SA |
0.1…6150 gpm | 1/2"…16" | -4…212 °F -20…100 °C Higher upon request |
~ ±10% | • Pressure ≤ 1450 psi • Avoid rapid medium temperature changes |
Other solutions for gases...
| Sensor Family | Flow Rate | Line Size | Medium Temperature | Accuracy | Points to Consider |
|---|---|---|---|---|---|
 SD |
0…412 scfm | 1/2"…2" | 32…140 °F 0…60 °C |
~ ±3% | • Totalizer function • Pressure ≤ 232 psi • Monitor air, CO2, N2 and Ar |
SA |
1…2700 scfm | 1/2"…16" | -4…212 °F -20…100 °C Higher upon request |
~ ±15% | • Pressure ≤ 1450 psi • Avoid rapid medium temperature changes |
SI flow sensor overview
The SI series stands out for its thermal technology, ideal for monitoring flow/no-flow conditions with fittings suited for common process connections in the food and beverage industry. These sensors ensure the consistent flow required for cooling systems, reducing maintenance issues associated with mechanical switches and safeguarding pumps against run-dry damage.
Sanitary flow sensor applications
Our sanitary flow sensors are ideal for applications including pump run-dry protection and maintaining proper flow through heat exchangers. The SI sensor's insertion-style design ensures easy installation and reliable flow monitoring to protect your processes and enhance product quality.
Key considerations for selecting sanitary flow sensors
- SI Series: Offers a flow velocity range of 3–100 cm/s across line sizes from 1/8" to 8", with the capability to withstand medium temperatures from -13 to 176°F (-25 to 80°C) and pressures up to 4350 psi. Sanitary versions are available, making it a versatile choice for sensitive applications.
- SM Series: Suitable for flow rates from 5 ml/min to 160 gpm and line sizes from 1/4" to 2", these sensors can operate in medium temperatures from 14 to 158°F (-4 to 194°F for units with TFT display), offering exceptional accuracy and features like conductivity monitoring and totalizing functions.
- SA Series: Catering to higher flow rates up to 6150 gpm and line sizes from 1/2" to 16", the SA sensors maintain their performance in medium temperatures ranging from -4 to 212°F (-20 to 100°C), ensuring reliable operation under high-pressure conditions up to 1450 psi.