Honeywell C7110A User Manual

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.

Models

Order Number Description Output

C7110A1005 Room Air Quality Sensor 0...10Vdc

C7110A

ROOM AIR QUALITY SENSOR

SPECIFICATION DATA & INSTALLATION INSTRUCTIONS

FEATURES

• Measurement of a variety of air quality factors

• Output signal: 0...10 Vdc (adjusted using potentio-

meter)

• 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

Max. load at output 5 kOhm
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 II as per EN60730-1
Protection standard IP30 as per EN60529
Flame retardant V0 as per UL94 Plastic ABS

using potentiometer

conductors up to 1.5 mm²

)

® U.S. Registered Trademark EN0B-0295GE51 R0409
Copyright © 2009 Honeywell Inc. • All rights reserved

C7110A ROOM AIR QUALITY SENSOR

R

R

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 CO

2 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.

1

methane

/

gas air

0.1

0.01
1

ammonia

acetic acid

CO

ethanol

hydrogen

ppm

100010010

Fig. 1 Sensor sensitivity with different gases

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.

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.

2

), depending on the application. The maximum

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.

LIFT

2

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.

60

68

97

104

99 30

Fig. 3 Dimensions and mounting holes (mm)

86

100

EN0B-0295GE51 R0409 2