HK Instruments RHT Series Installation Instructions

INTRODUCTION
Thank you for choosing an HK Instruments RHT series relative
humidity transmitter. The RHT series is intended for use in com-
mercial environments in HVAC/R applications.
The RHT series measures relative humidity (rH) and temperature
(T). Each measurement parameter (rH, T) has a separate field con-
figurable output.
The RHT series relative humidity transmitters are available with
Modbus configuration, relay and touchscreen display.
APPLICATIONS
RHT series devices are commonly used to monitor:
• humidity and temperature levels in offices, public spaces,
hospitals, meeting rooms and classrooms
SPECIFICATIONS
• humidity and temperature in various commercial applications
• humidity and temperature in HVAC/R environment
SPECIFICATIONS
Performance
Measurement ranges:
Temperature: 0...50 °C
Relative humidity: 0–90 %
Accuracy:
Temperature: <0.5 ºC
Relative humidity:
±4 % max @0...50 °C and 0–90 % 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: Pt1000
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 2014
HUMIDITY TRANSMITTERS
RHT Series
• 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.
Physical
Dimensions:
Case: 99 x 90 x 32 mm
Weight:
150 g
Mounting:
3 screw holes slotted, 3.8 mm
Materials:
Case: ABS (UL 94 V-0 approved)
Protection standard:
IP20
Display (Optional)
Touchscreen
Size: 77.4 x 52.4 mm
Electrical connections:
Power supply:
5-screw terminal block
(24 V, GND, rH, T, NC)
12–24 AWG (0.2–1.5 mm
2
Relay out:
3-screw terminal block
(NC, COM, NO)
12–24 AWG (0.2–1.5 mm
2
www.hkinstruments.fi
WARNING
Electrical
Input:
24 VAC or VDC, ±10 %
Current consumption 150 mA (Avg)
Temperature output signal:
0–10 V, R>1 kΩ
2–10V, R>1 kΩ
4–20 mA, R<500 Ω
Relative humidity output signal:
0–10 V, R>1 kΩ
2–10 V, R>1 kΩ
4–20 mA, R<500 Ω
Relay out:
SPDT Relay, 250 V–30 V, 6 A
Conformance
Meets requirements for CE marking:
EMC Directive: 2004/108/EC
)
RoHS Directive: 2002/95/EC
WEEE Directive: 2002/96/EC
)
INSTALLATION
INSTRUCTIONS
Installation version 2.0 2014