User Manual

CM1N1853E / 10.1999 Siemens Building Technologies
2/4 Landis & Staefa Division
The sensor senses the temperature via the Pt1000 thin-film measuring element whose
electrical resistance varies according to the temperature of the ambient air.
This variation is converted to two mutually independent DC 0...10 V signals. One signal
corresponds to the 0...50 °C temperature range, the other to the
−
35...+35 °C range.
The room sensor comprises a housing with a removable cover and an immersion sensor
stem. The housing and stem are made of plastic and are inseparably connected to
each other. A rubber seal is installed between the housing and cover in order to satisfy
the requirements of the IP 65 degree of protection.
The sensing elements are installed in the end of the stem, protected by a screw-on cap
with a Coretex filter.
The housing accommodates a circuit board with the sensor electronics and connection
terminals. The cable is connected via a circular connector with a screwed plug.
The connector consists of a built-in plug with Pg 11 screw connection and a coupling
with a screw fastening. The built-in plug is installed on the housing and electrically
connected inside. The coupling is enclosed in the package.
The sensor is designed for wall mounting.
The sensor is serialised, registered and calibrated before delivery. The corresponding
calibration certificate is enclosed.
Use a safety extra-low voltage (SELV) transformer with separate windings designed for
100 % duty.
The mandatory safety specifications at the plant location shall apply to sizing and
protecting the transformer.
The connection of the sensor is described in the data sheets of those devices it is to be
connected to (connection of active sensors).
The maximum permissible cable lengths are mandatory.
Install on an inside wall (NOT an outside wall) of the room to be air-conditioned; not in a
recess, between shelves, behind curtains or furniture, above or close to heat sources;
not on a wall behind which a flue or fireplace is located.
Do not expose the device to solar radiation.
Install the sensor in the occupied area at an approximate height of 1.5 m and at least
50 cm from the next wall.
The measuring rod's sensing elements are sensitive to impact. Avoid any such impact
on mounting.
Do not install the device with the immersion sensor stem pointing upwards.
Installation instructions are enclosed with the sensor.
Perform a wiring check on commissioning. The settings required for air conditioning
control, compensation and limitation are made at the devices to which the QFA66/C
sensor is connected. Do not attempt to make adjustments to the sensor.
Landis & Staefa provides a recalibration service
1)
for used sensors.
The recalibration should be performed at 12 month intervals under "normal" conditions,
i.e. within the comfort range for humidity and temperature, and at air contamination
levels that are not above average.
(Re)calibrated sensors should not be stored longer than 12 months before
commissioning.
Recalibration or readjustment with repair can be refused if a sensor is more than
10 years old and in poor condition.
Temperature
Mechanical design
Calibration certificate
Engineering notes
Installation notes
Location
Caution!
.
.
Orientation
Installation instructions
Commissioning notes
Recalibration service