
521
HUMIDITY
HUMIDITY
9
WE MAKE IT EASY.
kele.com 888-397-5353 USA
March 2014
ROOM, DUCT, AND OSA 2% HUMIDITY TRANSMITTERS
HT2D, HT2O, HT2S
Accuracy
Humidity ±2% (5 to 90% RH)
Temperature ±0.5°F (0.27°C)
Supply Voltage 9.4-35 VDC (24V nominal)
Signal Output 4-20 mA
Maximum Output
Impedance (Power supply – 9.4V) / 0.02 = load,
i.e., (24V – 9.4V) / 0.02 = 730Ω
Measurement Range
Humidity 0 to 100% RH
Temperature
“EN” Range -20° to 140°F (-29° to 60°C)
“S” Range -0° to 100°F (-18° to 38°C)
“H” Range 40° to 90°F (4° to 32°C)
Sensing Technology
Humidity Capacitive monolithic IC
Temperature Platinum 1000Ω RTD 385 curve
Operating Temperature
Room -10° to 150°F (-23° to 65°C)
Duct/OSA -10° to 185°F (-23° to 85°C)
Wiring Terminations Nonpolar terminals
(22-14 AWG wire)
Weight
Room 0.3 lb (0.13 kg)
Duct 1.1 lb (0.50 kg)
OSA 1.16 lb (0.53 kg)
Warranty 3 years
DESCRIPTION
The Minco Model HT relative humidity transmitters are
full-range, high-accuracy building automation transmitters.
Model HT covers 0% to 100% RH over a wide temperature.
The standard two-wire, 4-20 mA output provides low cost
space, duct, and outdoor monitoring for building control.
FEATURES
• 100% replacement for discontinued Hycal transmitters
• Advanced wall-mount design
• Weather-resistant housing for duct and OSA use
• Dual output option (humidity and temperature)
OPERATION
The transmitter converts the relative humidity into a 4-20
mA signal. The HT transmitters have a microprocessor that
performs the temperature compensation calculations from
an onboard RTD. The microprocessor maintains both high
accuracy and low cost with a wide humidity and operational
temperature span.
An added optional temperature output is available in the
same enclosure. It comes with a 4-20 mA signal and a large
selection of temperature ranges.
The housings for the duct- and OSA-mount configurations are
suitable for outdoor use. The aluminum cast box is gasketed
to maintain a rain-tight environment for the transmitter.
SPECIFICATIONS
HT2D
HT2O
HT2S
FM
USC
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