Air Flow Meters
Flow switch QVE1901
for liquids in piping DN 20200.
Contact load / switching capacity: max. AC 230 V, 1 A, 26 VAmax. DC 48 V, 1 A, 20 W
Nominal pressure PN25
Manual setting of contact type (NO / NC)
Housing IP 65 / safety class II
Maintenance free
Mode of operation
Flow monitor of liquid medium in HVAC plants in hydraulic systems, in particular, refrigeration, heat pump and heating plants, e.g. for evaporators, boilers, heat exchangers, etc.
Installation notes
Observe all local regulations from the electrical utilities or waterworks as applicable
Allow for an extra loop of the connecting cable to ensure the switching value can be adjusted

Functional data Field of use
Suitable media : All liquids (not suitable for ammonia)
Piping diameter : DN 20200
Type of switch : contact
Max. contact rating : AC 230 V, 1 A / DC 48 V, 1 A
Max. switching capacity : AC 26 VA / DC 20 W
External supply line protection (EU) : Fuse slow max. 10 A or Circuit breaker max. 13 A Characteristic B, C, D according to or Power with current limitation of max.10 A
Switching point adjustment : manual, supplied with minimum switch-off value
Tolerance of switching
point ranges in the table : ±15 %
Setting range : See switching value table
Medium temp.(medium cannot freeze) : -20110 °C
Nominal pressure : PN 25
Environmental General environmental conditions
conditions Operation and storage : -2080 °C
Materials / Color Housing : Polyamide, black
Screw-in body G½" : Brass
Dimensions
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Structure : Flow switch
Material : Brass
Standard or Nonstandard : Standard
Pressure : Medium Pressure
Model Number : QVE1901