HK Instruments RHT Series Manual de usuario

INSTALLATION

INSTRUCTIONS

HUMIDITY TRANSMITTERS

RHT Series

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.

SPECIFICATIONS

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

• 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

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 mm2)

Relay out:

3-screw terminal block

(NC, COM, NO)

12–24 AWG (0.2–1.5 mm2)

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

SCHEMATICS

DIMENSIONAL DRAWINGS

INSTALLATION

STEP 1: MOUNTING THE DEVICE

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.

WARNING! Apply power only after the device is properly wired.

Figure 1 - Surface mounting

1) Select a mounting location on the wall at 1.2 m (4 ft) above the

ﬂoor. Locate the unit in an area with good ventilation and an

average temperature, where it will be responsive to changes

to the room conditions. The RHT may be mounted on a ﬂat

surface.

Do not locate the RHT where it can be effected by:

• Direct sunlight

• Drafts or dead areas behind doors

• Radiant heat from appliances

• Concealed pipes or chimneys

• Outside walls or unheated / uncooled areas

2) Use the device as a template and mark the screw holes.

3) Mount the wall plate with screws.

Display locking

jumper

Jumpers

Contact pins for

relay terminal

Contact pins for

terminal block

Terminal block

Terminal block for relay

99.0

90.0

83.0

49.5

14.0

45.0

18.0

Ø 4.0

32.0

STEP 2: WIRING DIAGRAMS

CAUTION!

• 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. The cover locking screw must be

installed if the line voltage is supplied to the relay.

• Care should be used to avoid electrostatic discharge to the

device.

• This unit has conﬁguration jumpers. You may need to

reconﬁgure this device for your application.

1) Route the cables through the square opening in the back plate

or for surface wiring select a knockout on the top or bottom of

the wall plate, as shown in Figure 2a.

2) Connect the wires as shown in Figure 2b and 2c.

STEP 3: CONFIGURATION

WIRING DIAGRAMS CONTINUED

Conﬁguration of the CDT series device consists of:

1) Conﬁguring the jumpers (see step 4).

2) Conﬁguration menu options.

(Display versions only. See the user manual for further details.)

Figure 2a - Routing the cables

24 V

GND

Temp

Output 0/2–10 V / 4–20 mA

Figure 2b - Wiring diagram: Power input & signal output

Wires can be routed through the square opening in the back plate

Wires can be routed through the top knockouts

Wires can be routed through the bottom knockouts

(Grey colour indicates that a jumper is installed)

No jumper

Circuit open

Jumper installed

Circuit closed

Jumper stored

COM

STEP 4: SELECTING THE OUTPUT MODE

1) Conﬁguration of the output modes of:

• Relative humidity (rH)

• Temperature (Temp)

Select the output mode, current (4–20 mA) or voltage (0–10 V),

by installing jumpers as shown in Figure 4. Each output, CO2,

relative humidity, and temperature are conﬁgured separately.

To select 2–10 V output mode on a display version device: First,

select 0–10 V output by jumper(s), then change the voltage (V)

output from 0–10 V to 2–10 V via the conﬁguration menu. Please

see the user manual for more details.

WARRANTY POLICY

The seller is obligated to provide a warranty of 24 months for the de-

livered goods regarding material and manufacturing. The warranty

period is considered to start on the delivery date of the product. If

a defect in raw materials or a production ﬂaw is found, the seller is

obligated, when the product is sent to the seller without delay or be-

fore expiration of the warranty, to amend the mistake at his/her dis-

cretion either by repairing the defective product or by delivering free

of charge to the buyer a new ﬂawless product and sending it to the

buyer. Delivery costs for the repair under warranty will be paid by the

buyer and the return costs by the seller. The warranty does not com-

prise damages caused by accident, lightning, ﬂood or other natural

phenomenon, normal wear and tear, improper or careless handling,

abnormal use, overloading, improper storage, incorrect care or re-

construction, or changes and installation work not done by the seller

or his/her authorized representative. The selection of materials for de-

vices prone to corrosion is the buyer’s responsibility, unless otherwise

is legally agreed upon. Should the manufacturer alter the structure of

the device, the seller is not obligated to make comparable changes to

devices already purchased. Appealing for warranty requires that the

buyer has correctly fulﬁlled his/her duties arisen from the delivery and

stated in the contract. The seller will give a new warranty for goods

that have been replaced or repaired within the warranty, however only

to the expiration of the original product’s warranty time. The warranty

includes the repair of a defective part or device, or if needed, a new

part or device, but not installation or exchange costs. Under no cir-

cumstance is the seller liable for damages compensation for indirect

damage.

2) Locking the display:

Install the jumper to lock the display to prevent access to the conﬁgu-

ration menu after installation is completed (see the schematics for the

location of the pins).

Jumper installed to the left side pins:

0–10 V output selected

Temp

0–10 V 4–20 mA

Jumper installed to the right side pins:

4–20 mA output selected

Temp

0–10 V 4–20 mA

Second jumper installed to the right side pins:

4–20 mA output selected for rH

Third jumper installed to the left side pins

0–10 V output selected for temperature

Temp

0–10 V 4–20 mA

Figure 4

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