Emerson Liebert SL-31080 Bedienungsanleitung

SL-31080 Product Specification/Installation Sheet page 1 6/03 (Rev. 0)

TEMPERATURE /HUMIDITY TRANSMITTER - WALL (4-20 MA)

Description

The THW420 combination

temperature/humidity transmitter

is designed to meet applications

that require local indication of both

temperature and humidity in a

single, aesthetically pleasing

enclosure.

This device incorporates a 10K ohm

(Ω) platinum RTD. The transmitter

requires 24 VDC. The sensor provides an

accurate and predictable four-wire, 4-20 mA

output signal for temperature and a second

4-20 mA output signal for humidity.

Dimensions

Specifications

Termination

The THW420 transmitter must be powered from a

24 VDC supply. The combination temperature/

humidity sensor is terminated as follows:

•Thehumidity transmitter requires a three-wire

termination for the 4-20mA output using 24 VDC.

•Thetemperature sensor also requires a three-

wire termination. In most cases, it obtains power

from the analog input to which it is connected and

no external power is required.

Though interference from external sources is not a

major problem with current transmitters, Liebert

recommends separating the wiring from line voltage

wiring and from wiring used to supply highly induc-

tive loads such as motors, generators and coils. Lie-

bert also recommends making power connections

with twisted pair wire of at least 22 AWG and crimp-

type connectors.

Ordering Information

Output 4 to 20 mA

Sensor 10K Ωplatinum RTD

Supply Voltage 24 VDC

Tolerance of Resistance

(Accuracy)

±1.5°F (±0.83°C)

±2% RH (from 15 to 95% RH)

Response Time 20 seconds for a 63% step

Environmental Operating

Range (Transmitter)

45°F to 96°F; 0 to 100% RH

(7°C to 35°C); 0 to 100% RH

4.5"

(1143mm)

2.25"

(572mm)

2.75"

(699mm)

0.95"

(241mm)

0.75"

(191mm)

FRONT

VIEW

SIDE

VIEW

TOP VIEW

Wall

!CAUTION

Liebert recommends wiring the sensor

WITHOUT power applied because

accidental arcing may damage the product

and will void the warranty.

Terminations

+24VDC should be

used at all times

SW2 OUTPUT SELECT

0-5V

CALRUN

RESIST.

4-20ma

SW2

Gnd

V+

Ch1

Ch2

DISPLAY CYCLE

IN SECONDS

POT1

Ch3

CAL

Temp

R19

T&B

SWITCH

Short

Norm

Open

SW1

RTH1 RTH2

%RH

Ch3

Ch2

Ch1

Building Automation

Products, Inc.

REV. 101600

XCOMBO T&B

4-20 mA

Input #1

Ground

4-20 mA

Input #2

Controller

To GND (common)

of controller*

From +24VDC

of controller or

power supply

To controller’s

analog input

(humidity signal,

4-20mA)

To controller’s

analog input

(temperature signal,

4-20mA)

* NOTE:

The GND (common)

terminal is common

between the Power

and Sensor

Quantity Part # Description

THW420 Combination Temperature/Humidity Transmitter Wall 4-20 mA @ 45°F to 96°F and 0 to 100% RH

SL-31080 Product Specification/Installation Sheet page 2 6/03 (Rev. 0)

Mounting

Enclosure Mounting Instructions

Mounting hardware is provided for both junction box

and drywall installation.

1. Pull the wires through the opening in the base

plate.

2. For junction box installation: Secure the

base to the box using the #6-32 x 1/2" mounting

screws provided.

For drywall installation: Drill two 3/16" holes

3-1/4" apart on center. Insert the drywall

anchors and secure the base using the #6 x 1"

sheet metal screws provided.

3. Terminate the unit according to the guidelines

in Termination on page 1.

4. Attach the cover by latching it to the top of the

base, rotating the cover down and snapping it

into place.

5. Secure the cover by backing out the lock-down

screws using a 1/16" allen wrench until they are

flush with the bottom of the cover.

Troubleshooting Guide

The following table lists common problems and possible solutions. For more information, consult your local

dealer, Liebert representative or the Liebert Worldwide Support Group.

Junction box

2" x 4"

Mounting

screws

Cover

Delta

base

Wall

Locking

screws

NOTE

In a wall-mount application, the wall temperature and the

temperature of the air within the wall cavity can cause

erroneous readings. The mixing of room air and air from

within the wall cavity can lead to condensation and premature

failure of the sensor.

To prevent these conditions, seal the conduit leading to the

junction box and seal the hole in the drywall by using an

adhesive backed, foam insulating pad.

Problems Possible Solutions

Unit will not operate • Check +24 VDC power supply at controller.

• Disconnect the sensor and check power wires for +24 VDC.

Humidity reading is maximum

20 mA or 100%

• Make sure the sensor is installed properly, and is not shorted.

•Quick Check: Remove the sensor. If the reading does not change, contact technical

support.

Humidity reading is minimum

4 mA or 0%

• Verify that the humidity sensor installed.

•Quick Check: Short the sensor terminal block with a wire. Does the reading change? If so,

the sensor may be faulty; if not, contact technical support.

Humidity reading in software

appears to be off more than

specified accuracy

• Check all software parameters.

• If available, check the sensor against a calibrated control such as a hygrometer.

• Determine if the sensor is exposed to an external source more than room.

Temperature sensor in front-

end software is reading high

• Make sure wiring is correct.

• Disconnect wires and measure with a multimeter.

Temperature sensor in front-

end software is reading low

• Make sure wiring is correct.

• Disconnect wires and measure with a multimeter.

SL-31080 Product Specification/Installation Sheet page 3 6/03 (Rev. 0)

Troubleshooting - Humidity Signal Verification

4 to 20 mA Signal

You will measure the humidity output by placing an ammeter in series with the controller input. The control-

ler input is connected to the terminal marked “Ch1 or Ch2” on the humidity board.

1. Verify the unit is terminated properly using Figure 2 shown below, and set your meter to the “Volts”

setting.

2. Verify you have 24 VDC supplied to the unit by measuring between the “V+” and “GND” terminals at the

sensor, as shown below in Figure 1.

3. Set your meter to “Amps” and measure the output between “Ch1 or Ch2” and the controller input as

shown below in Figure 1.

4. Use the following formula to determine what humidity the sensor is reading:

(mA - 4) / 0.16 = %RH

where mA is the current reading from the ammeter (in mA)

Example:

If the current reading is 16 mA, then:

%RH = (16 - 4) / 0.16

= 12 / 0.16

=75%

Figure 1 Supply Voltage and 4-20mA Verification Figure 2 4 to 20 mA Output Connection

Analog Input

ROOM SENSOR

CONTROLLER

GND(-)

V+

Ch1 or

Ch2

GND(-)

V+

Analog Input

GND(-)

V+

Ch1 or

Ch2

GND(-)

V+

ROOM SENSOR

CONTROLLER

V-

POWER SUPPLY POWER SUPPLY

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