GENERAL
The C7110A Room Air Quality Sensor is suitable for
measuring air quality in rooms, offices, and production bays.
This mixed gas sensor can be used to control ventilation
plants. It detects unpleasant odors, tobacco smoke, and
vapors emitted by such materials as furniture, carpets, paint,
glue, etc. As proven in practice, this device detects those
substances typically present in air having a poor quality,
some of which may otherwise go undetected by room
occupants, themselves. This sensor has proven itself in
numerous applications over many years.
NOTE: The mixed gas sensor does not measure or indicate
the concentration of individual gases, and thus
cannot be used for the monitoring or control of
specific substances.
FEATURES
? Measurement of a variety of air quality factors
? Output signal: 0...10 Vdc (adjusted using potentiometer)
? Adjustable output offset
? Easy installation and wiring connection
SPECIFICATION
Supply voltage 15...30 Vdc / 24 Vac (+/-10%)
Power consumption < 1 W
Output signal 0...10 Vdc (increases as air
quality worsens); adjustable
using potentiometer
Max. load at output 5 kOhm
Weight /Dimensions approx. 125 g / see page 3
Electrical connection Screw terminal block for
conductors up to 1.5 mm2
Air Quality Sensor
Sensitivity/Linearity see Fig. 1 on page 2
Dynamic behavior see Fig. 6 on page 4
Ambient Limits
Transport/storage temp. -30...+60 °C (-22...+140 °F)
Operating temperature 0...+50 °C (+32...+122 °F)
Humidity 5...95%rh, non-condensing
Safety
Protection class II as per EN60730-1
Protection standard IP30 as per EN60529
Flame retardant V0 as per UL94 Plastic ABS
FUNCTION
The electrical conductivity of a heated tin-dioxide semiconductor
sensor varies in proportion to the number of
molecules of the reducing agents. This leads to a voltage at
the measuring element which is amplified to an output
voltage of 0 to 10 Vdc.
The following particles and gases can be detected:
cigarette smoke, hydrogen, carbon monoxide, ethanol,
ammonia, etc.
In contrast to CO2 sensors, which selectively measure the
concentration of only one type of gas, a mixed gas sensor
is a broadband detector, i.e. the sensor signal does not
indicate the type of gas or its concentration in ppm (parts
per million). The complex and constantly changing composition
of room air makes it necessary to perform
broadband air quality measurement.
