HUMIDITY
3% Humidity Transmitter & Optional Temperature Transmitters
HD31K, HO31K, HW31K
DESCRIPTION
The Kele Models HW31K, HD31K, and HO31K 3% humidity
transmitters are specifically designed for use in HVAC/BAS
applications. These instruments measure relative humidity
from 0% to 100%. The standard two-wire, 4-20 mA output
provides low-cost humidity monitoring for building control.
The RH transmitters are available with thermistor or RTD
temperature sensors. They are available in room, duct, and
OSA mounting styles.
OPERATION
HD31K
The transmitter converts the relative humidity into a 4-20
mA signal with 3% accuracy. The optional temperature
sensors, thermistor or RTD, offer direct connections to most
automation systems.
HW31K
9
HO31K
FEATURES
HUMIDITY
•
•
•
•
OPTIONS:
0% to 100% RH measurement
3% accuracy (5% to 90% RH)
Two-wire, 4-20 mA output
White plastic design
• Temperature thermistor
• Temperature RTD
SPECIFICATIONS
Accuracy
Thermal Effect
Stability
Supply Voltage
Signal Output
Maximum Output
Impedance
Measurement Range
RH
Temperature
Sensor Protection
532
3% RH @ 73°F (23°C) from 5% to
90%; (0-5% & 90%-100%) add 4%
0.07% per °F
typically <±1% drift per year
9.5-28 VDC
RH: 4-20 mA Temperature: 4-20 mA
optional thermistor, RTD
725Ω @ 24VDC
(Supply voltage - 9.5V) / 0.02)
Operating Humidity
0-100% RH non-condensing
Operating Temperature-20° to 158°F (-29° to 70°C)
Enclosure Rating
White plastic
Wiring Terminations Screw terminals for loop termination
Weight
Room
0.3 lb (0.09 Kg)
Duct
0.58 lb (0.26 Kg)
OSA
0.72 lb (0.33 Kg)
Approvals
RoHs
Warranty
1 year
0-100%
-20° to 140°F (29° to 60°C)
(see ordering information)
Sintered filter (duct and OSA)
888-397-5353 USA
kele.com
When you need it right, right now, call Kele.
March 2014
HUMIDITY
3% Humidity Transmitter & Optional Temperature Transmitters
HD31K, HO31K, HW31K
DIMENSIONS
3.25 (8.26)
in
(cm)
2.5 (6.35)
0.75 (1.91)
2.3
(5.84)
4.50
(11.43)
0.88 (2.24)
4.87
(12.38)
1.20
(3.05)
Front View
Side View
5.5
(13.98)
Mounting
Tabs
Gasket
Correct position for mounting outdoor air sensor
.75
(1.91)
HW31K
HD31K
MOUNTING
HO31K
WIRING FOR ROOM UNIT
MOUNTING OSA SENSOR
The transmitter should be mounted preferably
on the north side (Northern Hemisphere) of a
building under the eave, not above windows
or doors. The transmitter should be mounted
vertically with the sensor slots pointing down.
Power Supply
24 VDC
Cover Hooks
0.75
(1.90)
4.75
(12.07)
1/2"
Conduit Hole
1/8" NPT
2.75
(7.0)
Wire-way
hole
RH
RH
North
Top Screw
Not Used
HUMIDITY
Room, Duct, OSA (RH or RH-T)
Duct and OSA
ORDERING INFORMATION
MODEL
HW31K
HD31K
HO31K
DESCRIPTION
3% room-mount humidity transmitter, 4-20 mA output
3% duct-mount humidity transmitter, 4-20 mA output
3% OSA-mount humidity transmitter, 4-20 mA output
OPTIONS (temperature sensor or transmitter)
-No temperature sensor
T3
10,000 thermistor @ 77 F (25 C), Type III
T11K 10,000 thermistor @ 77 F (25 C), Type III, with 11K shunt
T21
2252Ω thermistor @ 77˚F (25˚C), Type II
T22
3000Ω thermistor @ 77˚F (25˚C), Type II
T24
10,000 thermistor @ 77 F (25 C), Type II
T27
100,000Ω thermistor @ 77˚F (25˚C), Type II
T42
20,000Ω thermistor @ 77˚F (25˚C), Type IV
T63
1000Ω nickel RTD @ 70˚F (26˚C), Type III
T81
100Ω RTD @ 32˚F (0˚C), 385 platinum curve
T85
1000 @ 32˚F (0˚C), 385 platinum RTD
T91
1000 @ 32˚F (0˚C), 375 platinum RTD
HD31K
T3
DCPA-1.2
DCP-1.5-W
March 2014
24 V
V+
Optional
Thermistor or RTD
Temperature
Sensor
Board
Hooks
9Power
Humidity
4-20 mA
signal
V+
Cover Securing Screws
and Back Plate
8.38
(21.29)
Example: HD31K-T3 Duct-mount humidity transmitter with
10 kΩ Type III temperature sensor
RELATED PRODUCTSPAGE
Power supply, 120 VAC IN to 24 VAC/24 VDC OUT
994
Power supply, 24 VAC IN to 24 VDC OUT
995
WE MAKE IT EASY.
kele.com
888-397-5353 USA
533