QFM81.21 - Siemens Duct hygrostat, setpoint setting range 15...95 % r.h., setpoint adjuster inside device

The Siemens QFM81.21 is a Duct Hygrostat.

Use

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 minimum limiter in the supply air duct.

Duct Hygrostats QFM81… for relative humidity

On/off hygrostat with microswitch,

with temperature-compensated humidity sensor for temperature-independent humidity measurements,

with stabilized sensing strip (good linearity, very stable even at high humidity, insensitive to dust and contaminated air),

for the control of humidification equipment,

for the control of dehumidification equipment,

for mounting in ventilating ducts or rooms