Hardware Installation Guide

HS-DT_2X Transmitter Series

Duct Humidity and Temperature Transmitters, Nema 4X

Figure 1: HS-DT_2X Transmitter Series

Product Description
The HS-DT_2X Transmitter Series uses a highly accurate and reliable Thermoset Polymer based capacitance humidity sensor and
Platinum RTD temperature sensor together with state-of-the-art digital linearization and temperature compensated circuitry to monitor
humidity levels in a duct. The sensors are encapsulated in a 60-micron HDPE filter at the end of a 230 mm (9”) S/S probe and a
compact enclosure.

General Installation Requirements

For proper installation and subsequent operation of each device, pay special attention to the following recommendations:
- 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.

Take reasonable precautions to prevent electrostatic discharges to the controller when installing, servicing or operating
the controller. Discharge accumulated static electricity by touching one’s hand to a well-grounded object before working
with the controller.
Mounting Instructions
The transmitter installs 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 spot is selected, drill a 15 -20 mm (0.6” - .75“) hole for the probe.
Slide the probe in the drilled hole until the enclosure is flush against the duct. The airflow direction is not important. Secure the
enclosure to the duct with (2) #10 x 1” (25 mm) self-tapping screws (not provided). Tighten screws until the enclosure is tight against
the duct and that there is no movement of the enclosure as shown in Figure 2.

Figure 2: Mounting

A foam gasket is provided on the back of the enclosure, which provides a tight seal against any air leaks. The enclosure has a hinged
cover with a latch. Open the cover by slightly pulling on the latch on the right side of the enclosure, while simultaneously pulling on
the cover, as illustrated in Figure 3.

Figure 3: Opening

A 1/2" NPT threaded connection hole is provided in the bottom of the enclosure. Screw the EMT or cable gland connector in until tight.
See Figure 4. It is recommended that weatherproof EMT or cable gland fittings be used. The European enclosure includes 1/2" NPT
to M16 thread adapter and cable gland fitting.

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 Figure 4: EMT Connection

Make wire connections as per the illustrations in the Wiring section.

Swing door closed until securely latched. For added security, 2 screws are provided that may be installed in the integrated screw tabs.
See Figure 5.

Figure 5: Closing

Wiring
• Deactivate the 24 Vac/dc power supply until all connections are made to the device to prevent electrical shock or equipment
damage.
• Use 14-22 AWG shielded wiring for all connections and do not locate the device wires in the same conduit with wiring used
to supply inductive loads such as motors. Make all connections in accordance with national and local codes.
• Pull at least six inches of wire into the enclosure, then complete the wiring connection according to the wiring diagram for
the applicable power supply and output signal type.
• Connect the plus DC or the AC voltage hot side to the PWR terminal. For voltage output or AC power, the supply Common
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 supply Common is the same as the signal Common. See Figure 6.
• The analog outputs are designated as TEMP and RH by each terminal. Check the controller Analog Input to determine the
proper connection before applying power. See Figure 6.

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 Figure 6: Wiring

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Specifications
Humidity Sensor Type Thermoset Polymer based capacitive
Accuracy ±2, 3, or 5% RH, (5% to 95% RH)
Measurement Range 0 to 100% RH
Hysteresis ±1.5% RH maximum
Repeatability ±0.5% RH typical
Linearity ±0.5% RH typical
Sensor Response 15 seconds typical
Time
Stability ±1% RH typical at 50% RH in 5 yrs.
Temperature Sensor 1000Ω Platinum, IEC 751, 385 Alpha, thin film
Type
Sensor Accuracy ±0.1% of span
Operating -40˚ to 85˚C (-40˚ to 185˚F)
Temperature
Operating Humidity 0 to 95% RH non-condensing
Power Supply 18 to 35 Vdc, 15 to 26 Vac
Consumption 22 mA maximum
Input Voltage Effect Negligible over specified operating range
Protection Circuitry Reverse voltage protected & output limited
Output Signals 4-20 mA, 0-5 or 0-10 Vdc
Output Drive at 24 Vdc 550 ohms max for current output, 10K ohms min for voltage output
Internal Adjustments Clearly marked ZERO and SPAN pots
Wiring Connections Screw terminal block (14 to 22 AWG)
Enclosures Grey polycarbonate with gasket, UL94-V0 IP65 (NEMA 4X), the European enclosure includes
thread adapter (1/2" NPT to M16), and cable gland fitting
17 W x 102 H x 53 D mm (4.6” x 4.0” x 2.1”)
Probe 230 mm (9”) probe length x 12.7 mm (1/2”) diameter stainless steel with porous filter
Weight 220g (7.8 oz) including Probe
Country of Origin Canada

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Dimensions

©, Distech Controls Inc. 2019 All rights reserved.

While all efforts have been made to verify the accuracy of information in this manual, Distech Controls is not responsible for damages or claims arising
from the use of this manual. 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. Distech Controls reserves the right to change, delete or add to
the information in this manual at any time without notice.

Distech Controls, the Distech Controls logo, and Innovative Solutions for Greener Buildings are trademarks of Distech Controls Inc. All other
trademarks are property of their respective owners.

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