Distech controls Hs-d 2x sensor series Manual

Hardware Installation Guide

HS-D_2X Sensor Series

Duct Relative Humidity Transmitters with Optional Temperature Sensor, Nema 4X

Figure 1: HS-D_2X Series Humidity Transmitters.

Product Description

This document describes the hardware installation procedures for the HS-

D_2X Series humidity transmitters.

The HS-D_2X Series are duct humidity transmitters. They use a highly

accurate and reliable Thermoset-Polymer-based capacitance humidity

sensor and state-of-the-art digital linearization and temperature-

compensated circuitry to monitor humidity levels. The field replaceable

humidity sensor is encapsulated in a 60-micron HDPE filter at the end of

a 230 mm (9”) S/S probe. An optional temperature sensor is available.

Available with RH accuracies of 2%, 3%, or 5%.

General Installation Requirements

Read these instructions carefully before installing and commissioning

the RH transmitter:

- Upon unpacking the product, inspect the contents of the carton for

shipping damages. Do not install damaged device.

- Avoid areas where corroding, deteriorating or explosive vapors,

fumes or gases may be present.

- Ensure that all equipment is installed according to local, regional,

and national regulations.

Personal injury or loss of life may occur if you do not follow a

procedure as specified.

Equipment damage or loss of data may occur if you do not

follow a procedure as specified.

Do not use in an explosive or hazardous environment, with

combustible or flammable gasses, as safety or emergency

stop devices or in any other application where failure of the

product could result in personal injury.

Take reasonable precautions to prevent electrostatic

discharges to the

controller when installing, servicing or

operating the controller. Discharge accumu

lated static

electricity by touching a grounded object before manipulating

the controller.

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Relative Humidity Transmitter

The Relative Humidity transmitter uses a capacitive-type humidity sensor

and a microprocessor temperature compensation for reliable and

accurate readings.

NOTE: The humidity sensor used in these devices is static sensitive. Anti-

static precautions should be followed to prevent damage to the sensor.

Mounting

The transmitter should be installed directly into any air duct with a

minimum width/diameter of 25.5 cm (10”). Select a suitable installation

area in the middle of the duct wall. To achieve the best reading, do not

place in an area where air stratification may be present. Mount the

sensor at least 1.5 m (5‘) in either direction from elbows, dampers,

filters, or other duct restrictions. Avoid areas where the transmitter

is exposed to vibrations or rapid temperature changes.

Once a suitable location is selected, drill a 15-20mm (0.6” - 0.75“)

diameter hole for the probe.

Slide the probe in until the enclosure is flush up against the duct. The air

flow direction is not important. Secure the enclosure to the duct with two

(2) #10 x 1” (5mm⌀x 25mm L) self-tapping screws (not included). Tighten

the screws until the enclosure is firmly fixed to the duct, as shown in

Figure 2.1.

A foam gasket is provided at the back of the enclosure so as to ensure a

tight seal and prevent any air leaks.

The enclosure has a hinged cover fitted with a latch. Open the cover by

gently opening the latch at right side of the enclosure while pulling out the

cover, as illustrated in Figure 2.2.

Stick a conduit through the hole at the bottom of the enclosure and

secure it with a locknut, as shown in Figures 2.3 and 2.4. It is advisable to

use a weatherproof conduit or a cable gland.

Complete the wiring connections as indicated in the illustrations of the

“Wiring” section below.

Push the cover closed until it is securely latched. For optimal security, 2

screws are provided for installation in the integrated screw tabs (see

Figure 2.5).

Figure 2.1: Mounting Step 1

Figure 2.2: Mounting Step 2

Figure 2.3: Mounting Step 3

Figure 2.4: Mounting Step 4

Figure 2.5: Mounting Step 5

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Wiring

• Deactivate the 24 Vac/dc power supply until all the connections are

done for the device in order to prevent electrical shock or equipment

damage.

• Use 14-22 AWG (2.08 mm2to 0.205 mm2) shielded wiring for all

connections and do not locate the device wires in the same conduit as

any wiring used to supply inductive loads such as motors. Perform all the

connections in accordance with the applicable national and local codes.

• Provide at least 6” (15cm) of wire into the enclosure, then complete the

wiring connection according to the wire diagram for the applicable power

supply and output signal type.

• Select the desired signal output type (mA or Vdc) by placing the output

switch in the required position, as shown in Figure 3. The factory default

is mA (4-20 mA).

• If mA was selected, no further Output set-up is required. If VOLT output

is selected in Figure 3, place the Voltage Output switch to the desired

span position, as shown in Figure 4, i.e. 10 = 0-10 Vdc. The factory

default is 10v = 0-10Vdc.

• Connect the DC positive or the AC voltage hot side to the PWR

terminal. For voltage output or AC power, the Common supply is

connected to the COM terminal. The device is reverse voltage protected

and will not operate if connected backwards. It has a half-wave power

supply, so the Common supply is the same as the Common signal. See

Figure 5.

•The analog output is available at the OUT terminal. Check the controller

Analog Input to determine the proper connection before applying power,

as shown in Figure 4.

• If installed, the resistance temperature output is available at the two

terminals labelled TEMPERATURE SENSOR, as shown in Figure 6.

Dimensions

Distech Controls is not responsible for damages or claims arising out of improper or careless installation or handling of its products. Persons using this manual are assumed to be trained

HVAC specialist / installers and are responsible for using the correct wiring procedures and maintaining safe working conditions with fail-safe environments.

Global Head Office - 4205 place de Java, Brossard, QC, Canada, J4Y 0C4 - EU Head Office - ZAC de Sacuny, 558 avenue Marcel Mérieux, 69530 Brignais, France

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