567
HUMIDITY
HUMIDITY
9
WE MAKE IT EASY.
kele.com 888-397-5353 USA
March 2014
OUTDOOR ASPIRATED HUMIDITY / TEMPERATURE HOUSING
A21
Supply Voltage 24 VDC @ 110 mA (plus power
requirements for the humidity/
temperature transmitters)
Maximum Output
Impedance 47Ω added to the 4-20 mA transmitter
Fan 12 CFM
Filter Type Washable foam filter
Operating Temperature
-40° to 120°F (-40° to 49°C)
Enclosure Rating NEMA 3R with white enamel paint and
latch for padlock
Hinge Piano-type, left-hand side
Weight 6.31 lb (2.9 Kg)
Warranty 1 year
5.0
(12.7)
0.5
(1.27)
1.75
(4.44)
6.5
(16.51)
5.25
(13.34)
0.5
(1.27)
0.5 (1.27)
1.0 (2.54)
Fan
B
C
DEF
A
Lower Back Plate*
4.25"W x 4.25"H x 3"D
Conduit Entry
1/2" & 3/4" Knockouts
Interior
0.37
(0.95)
3.65
(9.27)
1.0
(2.54)
*Estimated usable dimensions
Terminal Strip
(projected
forward
3.5 (8.89) for
easy wiring)
Front View
Right Side
Left Side
Air Intake
Air Exhaust
Bottom View
1.64
(4.15)
7.0 (17.78)
4.7
(12.06)
3.0 (7.62)
0.25
(0.64)
0.20
(0.50)
6.32 (16.05)
0.5" and 0.75"
knockouts on
centerline and
height shown
10.0
(25.40)
9.0
(22.86)
Mounting
3.0
(7.62)
in
(cm)
DESCRIPTION
Model A21 Outdoor Aspirated Humidity/Temperature
Housing provides powered aspiration for outdoor monitoring
of humidity and temperature. The NEMA 3R enclosure
is painted white to reduce the effect of radiation, and the
enclosure has a lockable latch for security.
B
C
DEF
A
24VDC
Power
Supply
Do not use
or terminate
A21
4-20 mA to
Controller Input
Installed
Transmitter
–
Not used
+ – +
+
To Controller
Input
Dry Bulb Temperature
+
+
*
Temperature
sensors are directly
wired to the controller.
They do not wire to
the terminal strip.
*
-
-
WIRING
OPERATION
The fan pulls air in from the lower vent intake and exhausts
the air out the upper opposing vent of the enclosure at 12
CFM. The 24 VDC power is supplied for both the fan and
transmitters. The transmitter power is internally filtered from
any fan motor noise that might affect the transmitter signal.
DIMENSIONS
SPECIFICATIONS
ORDERING INFORMATION
MODEL DESCRIPTION
A21 Outdoor aspirated humidity/temperature housing
RELATED PRODUCTS PAGE
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