Siemens QFA1 Series Manual

Use
Type summary
CE1N1518en
2014-07-30
QFA1001
Room Hygrostats
for relative humidity
• Hygrostat with single-pole microswitch
• Humidity measuring element made of stabilized plastic texture
• Setpoint knob for the upper switching point
• For controlling humidification equipment
• For controlling dehumidification equipment
• For mounting directly on the wall or on a recessed conduit box
The room hygrostats are used for controlling and monitoring relative humidity in ventila-
tion or air conditioning plant.
They ensure room humidity control within the selectable range of 30 to 90 % relative
humidity by controlling humidification or dehumidification equipment.
They can also be used for monitoring minimum or maximum humidity levels.
Type Setpoint setting
reference range
QFA1000 30...90 % r. h.
QFA1001 30...90 % r. h.
1) The static switching differential is determined at a constant ambient humidity by turning the setting
knob.
The dynamic switching differential is determined by changing the ambient humidity while maintain-
ing the same setpoint adjustment; only the dynamic switching differential is of practical value.
QFA1000
Switching differential
Statically Dynamically
Approx. 4 % r.h.
Approx. 4 % r.h.
Building Technologies
1
518
QFA1...
1)
Setpoint
knob
6 % r.h. Internally
6 % r.h. Externally