Manualshelf

User Manual

ManualsBrandsSiemens ManualsSensors TemperatureCE Declaration QFA81 / QFA81.1
12345
s
1
514
Duct Hygrostats
QFM81…
for relative humidity
QFM81.21 QFM81.2
On/off hygrostat with microswitch,
with temperature-compensated humidity sensor for temperature-independent hu-
midity measurements,
with stabilized sensing strip (good linearity, very stable even at high humidity, in-
sensitive to dust and contaminated air),
for the control of humidification equipment,
for the control of dehumidification equipment,
for mounting in ventilating ducts or rooms
The duct hygrostats are designed for controlling and monitoring the relative humidity in
ventilating and air conditioning plants.
They control the humidity content of the air within an adjustable range of 15 to 95 % r.h.
In air conditioning plants with humidification, the duct hygrostat can also be used as a
maximum limiter in the supply air duct.
In laboratories or production facilities, the duct hygrostat can also be used as a mini-
mum limiter in the supply air duct.
Type reference Setpoint
range (W
h
)
Switching
differential (X
)
Degree of
protection
Setpoint
adjustment
QFM81.2
15…95 % r.h. approx. 4 % r.h. IP 30 externally
QFM81.21
15…95 % r.h.
IP 55
internally
When ordering, please give name and type reference; for example:
duct hygrostat QFM81.2
The delivery comprises the hygrostat, a mounting flange (for duct or wall mounting) and
a sealing ring (for duct mounting).
Use
Type summary
Ordering and
delivery
CM1N1514E
2014-07-30
Building Technologies

Summary of content (5 pages)