Howden has listened to customers’ concerns about the calibration of the stall
probes and has developed a stall probe calibration procedure. The calibration
procedure ensures reliable operation of the stall probe and makes sure you are
alerted in case of the fan stalling.
Axial fans running in stall can lead to
catastrophic equipment failure, causing
severe damage to equipment and
Fans running in stall for a prolonged period
of time can experience blade rupture with
the result of costly replacement of major fan
components as well as considerable
The Howden stall probe instantly detects the
formation of a stall cell in an axial fan.
Incorrect calibration or plugging (refer
"Technical Bulletin 6: Howden Purge Air
System") can result in the probes not
detecting or warning of stall, leading to
catastrophic failure because no warning is
given, and the fan continues to operate in
the stall region.
The stall probe detects whether a fan is
running in stall or not, and correct inspection
and calibration are required for optimum
operation of the stall probe.
* Refer to IOM manual for correct blade angle
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