Instruction Manual

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INSTALLATION

INSTRUCTIONS

HUMIDITY TRANSMITTERS

RHT-MOD Series

• READ THESE INSTRUCTIONS CAREFULLY BEFORE

ATTEMPTING TO INSTALL, OPERATE OR SERVICE THIS

DEVICE.

• Failuretoobservesafetyinformaonandcomplywith

instrucons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

insulaonratedforfulldeviceoperangvoltage.

• Toavoidpotenalreand/orexplosiondonotuseinpotenally

ammableorexplosiveatmospheres.

• Retaintheseinstruconsforfuturereference.

• Thisproduct,wheninstalled,willbepartofanengineered

systemwhosespecicaonsandperformancecharacteriscs

arenotdesignedorcontrolledbyHKInstruments.Review

applicaonsandnaonalandlocalcodestoassurethatthe

installaonwillbefunconalandsafe.Useonlyexperiencedand

knowledgeabletechnicianstoinstallthisdevice.

SPECIFICATIONS

Thank you for choosing an HK Instruments RHT-MOD series rela-

vehumiditytransmier.TheRHT-MODseriesisintendedforusein

commercialenvironmentsinHVAC/Rapplicaons.

TheRHT-MODmeasuresrelavehumidity(rH),andtemperature(T).

RHT-MODdevicesareavailablewithlargetouchscreendisplaymak-

ingconguraonofthedevicequickandeasy.

RHT-MODseriesdevicesarecommonlyusedtomonitor:

•humidityandtemperaturelevelsinoces,publicspaces,hospitals,

meengroomsandclassrooms

•humidityandtemperatureinvariouscommercialapplicaons

•humidityandtemperatureinHVAC/Renvironment

SPECIFICATIONS

Performance

Measurement ranges:

Temperature:0...50°C

Relavehumidity:0–100%

Accuracy:

Temperature:<0.5ºC

Relavehumidity:±2...3%at0...50°Cand10–90%rH

Totalerrorbandincludesaccuracy,hysteresisand

temperatureeectover5...50°Cand10–90%rH.

Technical Specicaons

Media compability:

Dryairornon-aggressivegases

Measuring units:

°Cand%rH

Measuring element:

Temperature:Integrated

Relavehumidity:Thermosetpolymercapacive

sensingelement

Environment:

Operangtemperature:0...50°C

Storagetemperature:-20...70°C

Humidity:0to95%rH,noncondensing

Physical

Dimensions:

Case:99x90x32mm

Weight:

150g

Mounng:

3screwholessloed,3.8mm

Materials:

Case:ABS

Protecon standard:

IP20

Display

Touchscreen

Size:77.4x52.4mm

Electrical connecons:

Powersupply:

 5-screwterminalblock

 (24V,GND)

 0.2–1.5mm

2

(12–24AWG)

Relayout:

 3-screwterminalblock

 (NC,COM,NO)

 0.2–1.5mm

2

(12–24AWG)

Electrical

Input: 24VACorVDC,±10%

 Currentconsumpon:max90mA(at24V)+

 10mAforeachvoltageoutputor20mAfor

 eachcurrentoutput

Relayout:

 SPDTRelay,250VAC/30VDC/6A

 Adjustableswitchingpointandhysteresis

Oneanalogoutputforselectedmedia:

0/2*–10VDC,LoadRminimum1kΩ

*(2–10VDCdisplaymodelsonly)or

4–20mA,maximumload500Ω

Communicaon

Protocol:MODBUSoverSerialLine

TransmissionMode:RTU

Interface:RS485

Byteformat(11bits)inRTUmode:

 CodingSystem:8-bitbinary

 BitsperByte:

  1startbit

  8databits,leastsignicantbitsent

  rst

  1bitforparity

  1stopbit

Baudrate:selectableinconguraon

Modbusaddress:1−247addressesselectablein

conguraonmenu

Conformance

MeetsrequirementsforCEmarking:

EMCDirecve2014/30/EU

RoHSDirecve2002/95/EC

LVDDirecve2014/35/EU

WEEEDirecve2012/19/EU

INTRODUCTION WARNING

APPLICATIONS

COMPANY WITH

MANAGEMENT SYSTEM

CERTIFIED BY DNV GL

= ISO 9001 = ISO 14001 =

RoHS 2

2011/65/EU

Summary of content (4 pages)

PAGE 1
INSTALLATION INSTRUCTIONS HUMIDITY TRANSMITTERS RHT-MOD Series INTRODUCTION WARNING Thank you for choosing an HK Instruments RHT-MOD series relative humidity transmitter. The RHT-MOD series is intended for use in commercial environments in HVAC/R applications. The RHT-MOD measures relative humidity (rH), and temperature (T). RHT-MOD devices are available with large touchscreen display making configuration of the device quick and easy.
PAGE 2
INSTALLATION SCHEMATICS 1) Mount the device in the desired location (see step 1). 2) Route the cables and connect the wires (see step 2). 3) The device is now ready for configuration. Display locking jumper WARNING! Apply power only after the device is properly wired. STEP 1: MOUNTING THE DEVICE Terminal block Terminal block for relay Contact pins for terminal block Jumpers Contact pins for relay terminal DIMENSIONAL DRAWINGS 99.0 32.0 1) Select a mounting location on the wall at 1.2–1.
PAGE 3
WIRING DIAGRAMS CONTINUED STEP 2: WIRING DIAGRAMS CAUTION! Figure 2b - Wiring diagram: Power input & signal output • For CE compliance, a properly grounded shielding cable is required. • Use copper wire only. Insulate or wire nut all unused leads. • Supply a separate cable for relay and signal out when using line voltage to power the relay. • Any wiring may carry the full operating line voltage current based on field installation.
PAGE 4
Jumper settings CONTINUED MODBUS REGISTERS CONTINUED Function code 06 - Write single register Figure 4 Jumper installed to the left side pins: Jumper installed to the right side pins: 0–10 V output selected 4–20 mA output selected N/A N/A Analog N/A N/A Analog 0...10 V 4...20 mA 0...10 V 4...20 mA 2) Locking the display: Install the jumper to lock the display to prevent access to the configuration menu after installation is completed (see the schematics for the location of the pins).