Q-Series Outdoor Air and Critical Environment Technical Instructions
Relative Humidity and Relative Humidity & Temperature Sensors Document Number 155-755
February 28, 2013
Siemens Industry, Inc. Page 5
Mounting Notes
Interior Mounting for
QFA31 Series without
AQF3100
• Mount on an inside wall (not on outside wall) of the room to be air-conditioned. Do
not mount in recesses, shelves, behind curtains, above or close to heat sources; or
on walls behind which a chimney is located.
• Do not expose the sensor to direct sunlight.
• Install the sensor in an occupied space approximately five feet (1.5 m) above the
floor and at least 20 inches (50 cm) from the next wall.
CAUTION:
• Do not remove the seal between the housing and cover. The degree of
protection IP 65 will be no longer ensured if the seal is removed.
• Avoid any impact while mounting. The sensing elements inside the
measuring rod are sensitive to shock and impact.
Mounting Position
The sensor must be mounted with the measuring rod pointing downward for the QFA41
Series or the QFA31 Series (without the AQF3100 Outdoor Mounting Kit).
Mounting Instructions
Installation Instructions are printed on the sensor's packaging
Outdoor Mounting for
QFA31 Series with
AQF3100
Mounting Location
Mount on an exterior wall, preferably on the north or northwest side of the building. If
possible, mount in the middle of the wall, at least 8 feet (2.5 meters) above the ground.
Do not mount above or below windows, above doors or ventilation shafts, or below
balconies or eaves.
Mounting Position
The sensor and AQF3100 must be mounted in a vertical position (with the sun shield at
the top).
NOTE: When using the AQF3100 outdoor mounting kit, the sensor's cable entry hole
must be closed off with the grommet and the prepared M16 cable entry on the
opposite side knocked out.
Mounting Instructions
Installation Instructions are printed on the sensor's packaging
Commissioning
Notes
• Check the wiring before switching on power.
• Select the required temperature measuring range on the sensor.
Recalibration
Service
(QFA41 Series only)
Siemens Industry, Inc. provides a recalibration service for used sensors. Recalibration
should be performed at 12-month intervals under normal conditions (that is within the
comfort range for humidity and temperature and at air contamination levels that are not
above average). Recalibration requires the purchase of a new sensor tip (part number
AQF4150).
Services Provided
The recalibration service includes the following:
• Delivery and invoicing of the new AQF4150 measuring tip, complete with calibration
certificate.
• Delivery of a calibration certificate for the (old) measuring tip returned to Siemens
Building Technologies, Inc. enabling the customer to assess the time of usage of the
measuring.
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