Siemens Flow Switch QVE1901

Siemens Flow Switch QVE1901 is suitable for liquid medium in HVAC plants. In hydraulic systems, in particular, refrigeration, heat pump and heating plants, e.g. for evaporators, boilers, heat exchangers, etc. It is a maintenance free device with high IP rating to provide a compact and durable solution for your flow monitoring requirements.

Application :

  • Contact load / switching capacity: max. AC 230 V, 1 A, 26 VA max. 48 V. DC, 1 A, 20W

  • Nominal pressure PN25

  • Manual setting of contact type (NO / NC)

  • Housing IP 65 / safety class II


Suitable media All liquids (not suitable for ammonia)
Piping diameter DN 20...200
Type of switch Reed contact
Max. contact rating AC 230 V, 1 A / DC 48 V, 1 A Max.
Switching capacity AC 26 VA / DC 20 W
Medium temp. -20...110 °C
Nominal pressure PN 25
Protection class III according to EN 60730-1
External supply line protection (EU) Fuse slow max. 10 A (or)Circuit breaker max. 13 A (or)Power source with current limitation of max.10 A
Operation and storage -20...80 °C
Ambient humidity 95 % RH

Note: For more detailed specifications, please download the additonal documents