1
518
QFA1001
QFA1000
Room Hygrostats
QFA1…
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
Use
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 summary
Type
reference
Setpoint setting
range
Switching differential
1)
Setpoint
knob
Statically
Dynamically
QFA1000
30…90 % r. h.
Approx. 4 % r.h.
6 % r.h.
Internally
QFA1001
30…90 % r. h.
Approx. 4 % r.h.
6 % r.h.
Externally
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.
CE1N1518en
2014-07-30
Building Technologies
