GENERAL
The C7110A1010 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.
Models
order no. description output signal
C7110A1010 Room Air Quality Sensor 0...10 Vdc
C7110A1010
ROOM AIR QUALITY SENSOR
SPECIFICATION DATA & INSTALLATION INSTRUCTIONS
FEATURES
Measurement of a variety of air quality factors
Output signal: 0...10 Vdc, indicated by yellow status
LED on front cover
Trimming potentiometer to adjust output signal
Easy installation and wiring connection
SPECIFICATION
Supply voltage 15...30 Vdc / 24 Vac (+/-20%)
Power consumption < 1 W
Output signal 0...10 Vdc (increases as air
quality worsens); adjustable via
trimming potentiometer
Min. impedance of load 5 kOhm (at output)
Weight /Dimensions approx. 125 g / see page 3
Electrical connection Screw terminal block for
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 III as per EN60730-1
Protection standard IP30 as per EN60529
Flame retardant Plastic ABS, V0 as per UL94
EMC environments residential, commercial, light
conductors up to 1.5 mm²
)
industrial, and industrial
® U.S. Registered Trademark EN0B-0644GE51 R1109A
Copyright © 2009 Honeywell Inc. • All rights reserved
C7110A1010 ROOM AIR QUALITY SENSOR
FUNCTION
The device contains a heated tin dioxide semiconductor
sensor, the electrical conductivity of which varies in proportion
to the concentration of reducing agents in the ambient air.
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 CO
concentration of only one type of gas, the C7110A1010 is a
mixed gas sensor and as such functions as 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 using such a broadband detector.
INCREASING OUTPUT VOLTAGE
Fig. 1. Output voltage as a function of gas concentration
2 sensors, which selectively measure the
INCREASING GAS CONCENTRATION
HYDROGEN
ETHANOL
ISOBUTANE
CO
METHANE
Positioning
To avoid falsifying the measuring results, the device should
be installed at sites at which typical air quality prevails.
Direct exposure to sunlight and drafts should be avoided.
If the device is mounted on a standard flush box, the end of
the installation tube in the flush box must be sealed so to
avoid any draft in the tube falsifying the measuring result.
Maintain a mounting clearance of approx. 4 in. (10 cm) to the
right-hand side of the module in order to allow free airflow to
the air quality sensor.
Mounting
1. The cover of the air quality sensor is fixed by a tab on
the underside of the unit; to disassemble the cover
and the sub-base, see Fig. 2. To access all of the
mounting holes, pull off the perforated cover, bend
down slightly the tab to release the printed circuit
board, and leverage the printed circuit board out (see
Fig. 3).
LIFT
2
INSTALLATION
Wiring
All wiring must comply with local electrical codes and
ordinances or as specified on installation wiring diagrams.
Wall module wiring can be sized from 16 to 22 AWG (1.5 to
0.34 mm
length of wire from a device to a wall module is 1000 ft (305
m). Twisted pair wire is recommended for wire runs longer
than 100 ft (30.5 m).
Keep wiring at least one ft (305 mm) away from large
inductive loads such as motors, line starters, lighting ballast,
and large power distribution panels.
Run wall module wiring separately from 50 Vac or greater
power wiring.
2
), depending on the application. The maximum
CAUTION
Low Voltage Equipment.
Risk of equipment damage.
The 24 Vac power source for this product must be a
safety isolating transformer. A transformer that is CE
certified and meets the Low Voltage Device (LVD)
requirements must be used in Europe for all
installations of this product.
1
PRESS
Fig. 2. Cover disassembly
2. a) Mount the sensor onto the wall outlet box,
or
b) bore wall holes as specified in Fig. 3 and mount
the wall module with appropriate screws.
EN0B-0644GE51 R1109A 2
OUTPUT
V
86
60
TAB TO
RELEASE
PCB
68
97
104
99 30
100
OLTAGE
Y24V~24V
Fig. 3. Dimensions and mounting holes (mm)
IMPORTANT
Screw-type terminal blocks are designed to accept
no more than one 16 AWG (1.5 mm
2
) conductor.
3. After re-inserting the printed circuit board and the
perforated plate, connect the wires to the terminal
block as follows:
a) Strip 3/16 in. (5 mm) of insulation from the
conductor.
b) Insert the wire in the required terminal location
(see Fig. 5) and tighten the screw to complete
the termination.
4. Adjust the trimming potentiometer (see section
“Adjusting the Offset Signal”).
5. Remount the cover as shown in Fig. 4 and make sure
that the tab on the underside engages.
6. The sensor is now operational. When the air quality
deteriorates, the voltage of the output signal will rise.
OFFSET
C7110A1010 ROOM AIR QUALITY SENSOR
1
2
Adjusting the Offset Signal
After mounting the device, the output signal should be
adjusted in accordance with expected ambient conditions and
individual preferences.
The output signal is adjusted using the trimming potentiometer located on the sensor board (see Fig. 5).
Y24V~24V
Y 24V 24V~
POTENTIOMETER
Fig. 5. Wiring Connection and Trimming Potentiometer
Fig. 4. Cover assembly
OUTPUT
VOLTAGE
OFFSET
TRIMMING
OFFSET
STATUS LED
SENSOR
(Do not touch!)
The offset of the output signal is increased or lowered by
means of this potentiometer. The yellow status LED (see Fig.
5) indicates the corresponding signal strength:
Turning the trimming potentiometer clockwise (CW)
decreases the output signal (minimum brightness is
reached at an output signal of 1.5 V)
Turning the trimming potentiometer counterclockwise
(CCW) increases the output signal (maximum brightness
is reached at an output signal of 9 V).
3 EN0B-0644GE51 R1109A
C7110A1010 ROOM AIR QUALITY SENSOR
The sensor cannot distinguish pleasant from unpleasant
smells. The final determination of whether air quality is
satisfactory or not must be made by the persons living or
working in the room. Moreover, various air compositions are
occurring in different rooms.
Thus, the default (factory) setting of the setpoint is
provisional, only. The setpoint must be optimized to
correspond to the subjective feelings of the room occupants.
Adjustment Procedure:
1. Connect sensor and switch operating voltage on.
2. Ensure good air conditions close to the sensor (by
means of ventilation, etc.).
3. After approx. 30 minutes of operation, verify the output
signal. The voltage level should lie in the range
1…3 V. Correct an excessively high or excessively low
voltage level using the trimming potentiometer: The
trimming potentiometer should be turned clockwise
(CW) until the yellow status LED is almost
extinguished. The output signal will then amount to
approx. 1.5 V (max. brightness is reached at 9 V).
NOTE: When first operating the device or after the device
has been powered down for more than 4 weeks
(e.g., during storage), the output signal may vary
during the first 48 hours of operation. In this case,
you should verify the output signal after 48 hours of
operation.
EXAMPLE OF DYNAMIC BEHAVIOR
Fig. 6 shows the dynamic characteristics of the C7110A1010,
monitored during test measurements in a sample room. This
voltage diagram as a function of different occupancy
conditions is only an example and must be proven for other
ambient conditions.
10
5
OUTPU T VOLTAGE ( V)
0
0
ROOM OCC.
ROOM OCC.
SENSOR IDLING
BY 2 PERSONS
ROOM UNOCC.,
ROOM OCC. BY 3
(INCL. 1 SMOKER)
BY 3 PERSONS
50
ROOM OCC.
BY 3 PERSONS
HAVE VACATED
ALL 3 PERSONS
Fig. 6. Dynamic behavior of the C7110A1010
ROOM
time (minutes)
WINDOW FAN
SWITCHED ON
ROOM UNOCC.,
100
SENSOR IDLING
Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, Rolle, Z.A. La Pièce 16, Switzerland by its Authorized Representative:
Automation and Control Solutions
Honeywell GmbH
Böblinger Strasse 17
71101 Schönaich, Germany
Phone: (49) 7031 63701
Fax: (49) 7031 637493
http://ecc.emea.honeywell.com
Subject to change without notice. Printed in Germany
EN0B-0644GE51 R1109A
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