C7600A
Solid State Humidity Sensor
PRODUCT DATA
FEATURES
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•
•
•
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Long-lasting solid state sensing element is accurate
and stable over time.
Sensor enclosed in rugged glass-fiber reinforced
plastic case.
Compact size and lightweight construction for easy
mounting in duct or on wall.
Vents in top of cover allow air flow to internal humidity
sensing element.
4 to 20 mA output inversely proportional to relative air
humidity.
Can be used indoors or outdoors.
GENERAL
The C7600A Solid State Humidity Sensor senses the relative
humidity of the return air and is used with the W7600
Multifunction Controller or any controller capable of
processing a 4 to 20 mA signal.
Contents
General ...............................................................................
Features ..............................................................................
Specifications ......................................................................
Ordering Information ...........................................................
Installation ...........................................................................
Operation ............................................................................
1
1
2
2
3
5
Copyright © 1996 Honeywell Inc.
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All Rights Reserved
63-2150-5
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C7600A SOLID STATE HUNIDITY SENSOR
20
18
16
14
12
10
· Attach the sensor to the wall with two 1/8 in. (3 mm)
RH (%) I (mA)
diameter screws.
10
20
30
40
50
60
70
80
90
18.4
16.8
15.2
13.6
12.0
10.4
8.8
» Wire as shown in the Wiring section.
Installing C7600 Solid State Humidity Sensor in
Return Air Duct (See Fig. 3)
7.2
5.6
8
NOTE: Installers need to supply the following: sheet metal
cutter or snips; drill with 1/16 in. (2 mm), 1/8 in.
(3 mm) and 1/2 in. (13 mm) bits; screwdrivers; 1/2 in.
(13 mm) rubber grommet; eight self-tapping sheet
metal screws; and two 1/8 in. (3 mm) by 3/4 in.
(19 mm) machine screws with lockwashers and nuts.
6
4
0
10 20 30 40 50 60 70 80 90 100
HUMIDITY IN % RH
M3130
Fig. 2. C7600A output current vs. relative humidity.
³ Cut a 5 in. (127 mm) by 6 in. (152 mm) rectangular
hole in one side of the return air duct.
INSTALLATION
· Center the sensor on a 6 in. (152 mm) by 7 in. (178 mm)
piece of sheet metal. Mark locations for mounting
screws and for a hole for the control wire.
When Installing this Product…
1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous
condition.
» Drill two 1/8 in. (3 mm) mounting holes for the sensor
and one 1/2 in. (13 mm) hole for the control wire.
2. Check the ratings given on the product to make sure
the product is suitable for your application.
3. Installer must be a trained, experienced service
technician.
¿ Drill eight starting holes in the sheet metal rectangle for
self-tapping sheet metal screws.
4. Checkout according to instructions provided with the
controller before leaving installation.
´ Center sheet metal rectangle over opening in duct so
there is a 1 in. (25 mm) overlap on all four sides. Then
mark the eight sheetmetal screw locations on the duct.
CAUTION
² Drill eight starting holes in the duct for self-tapping
Disconnect power before installation to prevent
electrical shock or equipment damage.
sheet metal screws.
¶ Attach sensor to sheet metal rectangle with 1/8 in.
(3 mm) by 3/4 in. (19 mm) machine screws, washers
and nuts. Attach the machine screws from the outside
of the sheet metal to eliminate protrusions and possible
sharp edges.
Location
When selecting the location, make certain that the humidity
sensor is not exposed to rain, snow, or direct sunlight. The
C7600A Solid State Humidity Sensor is designed to operate
in 500 ft/min minimum airflow.
º Place a rubber grommet in the 1/2 in. (13 mm) hole in
the sheet metal to protect the control wires from
abrasions.
Mounting
The C7600A Solid State Humidity Sensor can be mounted in
any position; however, the sensor must be installed where it
is exposed to freely circulating air, with at least 500 ft/min
airflow.
¾ Put the control wires through the 1/2 in. (13 mm) hole
and wire as shown in the Wiring section.
µ Attach the sheet metal rectangle to the duct with self-
tapping sheet metal screws. Make sure that airflow over
the sensor is as shown in Fig. 3.
Mounting the C7600 Solid State Humidity
Sensor Outdoors
³ Select a location protected from rain, snow or direct
sunlight.
3
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C7600A SOLID STATE HUMIDITY SENSOR
7
(127)
5
AIR FLOW
6
(152)
AIR FLOW
8
1
6
(152)
AIR FLOW
AIR FLOW
3
7
(178)
9
4
2
10
5,6
M5242A
Fig. 3. Installing C7600A Solid State Humidity Sensor in return air duct.
63-2150—5
4
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C7600A SOLID STATE HUNIDITY SENSOR
Wiring
OPERATION
Disconnect the power supply before beginning wiring to
prevent electrical shock or equipment damage. All wiring
must comply with applicable codes and ordinances.
Follow the wiring information furnished by the controller
manufacturer or refer to Fig. 4 for a typical wiring hookup.
Note and follow polarity markings for hookup.
The C7600A Solid State Humidity Sensor provides a 4 to 20
mA output signal that is inversely proportional to the relative
humidity of the return air.
The sensing element in the C7600A Solid State Humidity
Sensor is a humidity-sensitive polyamide film that changes
capacitance with a change in humidity. This change in
capacitance is converted by a printed circuit board assembly
to an output current between 4 and 20 mA. The output current
is used by an analog or a microprocessor-based controller to
measure and control humidity.
W7600
=8
=7
=6
=5
=4
=3
8=
7=
6=
DIGITAL
OUTPUTS
5=
DIGITAL
INPUTS
D COM=
=2
=1
=D COM
4=
3=
2=
DIGITAL
OUTPUTS
1=
D COM=
=24 VDC(+)
=8
=7
=6
ANALOG
INPUTS
=5
=A COM
4=
3=
2=
ANALOG
OUTPUTS
1=
A COM=
=20 VDC(+)
=4
=3
=2
=1
=A COM
+
ANALOG
INPUTS
4=
3=
2=
S7600A
1=
C7600C
RETURN AIR
HUMIDITY SENSOR
1
GND=
V2=
V1=
24 VAC
OUT
1
237 OHM, 1 PERCENT, 1/8 WATT
METAL FILM RESISTOR.
24 VAC
INPUT
V2=
V1=
=V1
=V2
=GND
24 VAC
OUT
M3128
Fig. 4. Wiring C7600A Solid State Humidity Sensor to W7600.
5
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Home and Building Control
Honeywell Inc.
Honeywell Plaza
P.O. Box 524
Minneapolis MN 55408-0524
Home and Building Control
Honeywell Asia Pacific Inc.
Room 3213-3225
Sun Hung Kai Centre
No. 30 Harbour Road
Wanchai
Honeywell Limited-Honeywell Limitée
155 Gordon Baker Road
North York, Ontario
M2H 2C9
Hong Kong
Honeywell Latin American Division
Miami Lakes Headquarters
Honeywell Europe S.A.
3 Avenue du Bourget
14505 Commerce Way Suite 500
Miami Lakes FL 33016
B-1140 Brussels Belgium
Helping You Control Your World®
Printed in U.S.A. on recycled paper
63-2150—5 G.H. Rev. 12-96
containing at least 10%post-consumer paper fibers
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