HK Instruments RHT DUCT Series Installation Instructions

INTRODUCTION
Thank you for choosing an HK Instruments RHT Duct series relative
humidity transmitter. The RHT series is intended for use in commer-
cial environments in HVAC/R applications.
RHT Duct is a relative humidity transmitter with temperature out-
put installed in air ventilation duct. Illuminated display ensures easy
readability also from a distance. The RHT has a screwless lid and an
easily adjustable mounting flange that make the installation of the
device easy.

APPLICATIONS

RHT Duct series devices are commonly used to monitor and control:
• Relative humidity and temperature levels of incoming and return air
in ventilation system

SPECIFICATIONS

SPECIFICATIONS
Performance
Measurement ranges:
Temperature: 0...50 ° C
/ 32...122
Relative humidity: 0–100 %
Accuracy:
Temperature: <0.5 º C
/ <0.9 °F
Relative humidity: ±2...3 % at 0...50 °C and 10–90 % rH
Total error band includes accuracy, hysteresis and
temperature effect over 5...50 °C and 10–90 % rH.
Technical Specifications
Media compatibility:
Dry air or non-aggressive gases
Measuring units:
°C and % rH
Measuring element:
Temperature: NTC10K
Relative humidity: Thermoset polymer capacitive
sensing element
Environment:
Operating temperature: 0...50 ° C
Storage temperature: -20...70 ° C
Humidity: 0 to 95 % rH, non condensing
Copyright HK Instruments 2017
HUMIDITY TRANSMITTERS
RHT Duct Series
Physical
Dimensions:
Case: 119 x 100 x 44.7 m
F °
Probe: L=188 mm, d=12 m
Mounting:
With flange, adjustable 0...188 m
Weight:
150 g
/ 5.30
Materials:
Case: ABS
Cover: PC
Probe: ABS
Mounting flange: LLPDP
Protection standard:
IP54
Electrical connections:
4 spring loaded terminals
(24 V, GND, rH, T)
0.2–1.5 mm
/ 32...122 °F
/ -4...158 °F

WARNING

• READ THESE INSTRUCTIONS CAREFULLY BEFORE
ATTEMPTING TO INSTALL, OPERATE OR SERVICE THIS
DEVICE.
• Failure to observe safety information and comply with
instructions can result in PERSONAL INJURY, DEATH AND/OR
PROPERTY DAMAGE.
• To avoid electrical shock or damage to equipment, disconnect
power before installing or servicing and use only wiring with
insulation rated for full device operating voltage.
• To avoid potential fire and/or explosion do not use in potentially
flammable or explosive atmospheres.
• Retain these instructions for future reference.
• This product, when installed, will be part of an engineered
system whose specifications and performance characteristics
are not designed or controlled by HK Instruments. Review
applications and national and local codes to assure that the
Installation will be functional and safe. Use only experienced and
knowledgeable technicians to install this device.
m
/ 4.68 x 3.94 x 1.76"
m
/ L=7.40", d=0 .47"
m
/ 0...7.40"
oz
(12–24 AWG)
2
www.hkinstruments.fi
Electrical
Supply voltage: 24 VAC or VDC ±10 %
Current consumption: max 90 mA (at 24 V) + 10 mA for
each voltage output
Output signals for every media:
0/2...5/10 VDC, Load R minimum 1 kΩ
Conformance
Meets requirements for CE marking:
EMC Directive: 2014/30/EU
RoHS Directive: 2011/65/EU
WEEE Directive: 2012/19/EU
COMPANY WITH
MANAGEMENT SYSTEM
CERTIFIED BY DNV GL
= ISO 9001 = ISO 14001 =
Installation version 5.0 2017
INSTALLATION
INSTRUCTIONS
RoHS 2
2011/65/EU