Johnson Controls Hx-68P3 Installation Manual

Hx-68P3 Series Outside Humidity and

Temperature Transmitters Installation Guide

Part No. 24-9647-10 Rev. B

2021-04-08

Application Requirements

The Hx-68P3 Series Outside Humidity and Temperature
Transmitter measures and transmits outside relative
humidity (RH) from 0 to 100% and temperatures from -40
to 140°F (-40 to 60°C). In addition to RH, the transmitter
offers selectable parameters including dew point, wet bulb
temperature, and enthalpy.

The integral weather shield provides ventilation,
blocks direct and reflected solar radiation, and blocks
precipitation without affecting performance. Mount the
transmitter outside on a pole or on a side of a building.

Important: The Hx-68P3 Series Outside Humidity
and Temperature Transmitter is intended to provide
an input to equipment under normal operating
conditions. Where failure or malfunction of the
humidity and temperature transmitter could lead
to personal injury or property damage to the
controlled equipment or other property, additional
precautions must be designed into the control
system. Incorporate and maintain other devices,
such as supervisory or alarm systems or safety
or limit controls, intended to warn of or protect
against failure or malfunction of the humidity and
temperature transmitter.

Important: Le Hx-68P3 Series Outside Humidity and
Temperature Transmitter est destiné à transmettre
des données entrantes à un équipement dans des
conditions normales de fonctionnement. Lorsqu'une
défaillance ou un dysfonctionnement du humidity
and temperature transmitter risque de provoquer
des blessures ou d'endommager l'équipement
contrôlé ou un autre équipement, la conception du
système de contrôle doit intégrer des dispositifs de
protection supplémentaires. Veiller dans ce cas à
intégrer de façon permanente d'autres dispositifs,
tels que des systèmes de supervision ou d'alarme,
ou des dispositifs de sécurité ou de limitation, ayant
une fonction d'avertissement ou de protection en cas
de défaillance ou de dysfonctionnement du humidity
and temperature transmitter.

North American emissions compliance

United States

This equipment has been tested and found to comply with
the limits for a Class A digital device pursuant to Part 15
of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when
this equipment is operated in a commercial environment.
This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in
accordance with the instruction manual, may cause
harmful interference to radio communications. Operation
of this equipment in a residential area may cause harmful

interference, in which case the users will be required to
correct the interference at their own expense.

Warning (Part 15.21)

Changes or modifications not expressly approved by the
party responsible for compliance could void the user’s
authority to operate the equipment.

Canada

This Class (A) digital apparatus meets all the requirements
of the Canadian Interference-Causing Equipment
Regulations.

Cet appareil numérique de la Classe (A) respecte toutes
les exigences du Règlement sur le matériel brouilleur du
Canada.

Industry Canada Statement(s)

This device complies with Industry Canada licence-exempt
RSS standard(s). Operation is subject to the following two
conditions:

1. This device may not cause interference, and

2. This device must accept any interference, including
interference that may cause undesired operation of
the device.

Le présent appareil est conforme aux CNR d'Industrie
Canada applicables aux appareils radio exempts de
licence. L'exploitation est autorisée aux deux conditions
suivantes :

1. L'appareil ne doit pas produire de brouillage, et

2. L'utilisateur de l'appareil doit accepter tout
brouillage radioélectrique subi, même si le
brouillage est susceptible d'en compromettre le
fonctionnement.

Installation

Parts Included

• relative humidity and temperature transmitter with
cable gland

• conduit adaptor

• weather shield

• pole mounting clamp with screws (wall mount screws
and anchors not included)

• installation instructions

Tools Needed

• medium Phillips screwdriver

• small slotted screwdriver

• wire cutters

• open-ended wrench

• zip ties

• cable clips

*24964710B*

HE-68P3-0N000, HT-68P3-0N000

Dimensions

Figure 1: Hx-68P3 Series Outside Humidity and
Temperature Transmitter Dimensions, in. (mm)

DIP Switch Settings

The DIP switches on the component board control the
humidity output parameter and scaling. Figure 2 shows
the default DIP switch settings.

Figure 2: DIP Switch Positions

Table 1: DIP Switch Positions for Metric Output

Analog Output Parameter

DIP Switch Position

and Scaling

Relative Humidity (RH)0 to
100%Temperature (T)-40 to
60°C

Dewpoint (Td)-40 to
60°CTemperature (T)-40 to
60°C

Enthalpy (h)-40 to 460 kJ/
kgTemperature (T)-40 to
60°C

Wet Bulb Temperature
(Tw)-40 to
60°CTemperature (T)-40 to
60°C

Change the position of the DIP switches to the desired
setting.

Table 2: DIP Switch Positions for Non-Metric Output

Analog Output Parameter

DIP Switch Position

and Scaling

Relative Humidity (RH)0 to
100%Temperature (T)-40 to
140 ° F

Dewpoint (Td)-40 to
140°FTemperature (T)-40 to
140°F

Enthalpy (h)-10 to 190 BTU/
lbTemperature (T)-40 to
140°F

Wet Bulb Temperature
(Tw)-40 to
140°FTemperature (T)-40 to
140°F

Hx-68P3 Series Outside Humidity and Temperature Transmitters Installation Guide2

Installing the Conduit Adaptor ­Optional

About this task:

Using the conduit adaptor is optional. If you do not use
the conduit adaptor, proceed to Mounting.
To install the conduit adaptor, follow these steps.

1. Loosen the six captive screws that hold the
transmitter cover in place. See Figure 4.

2. Unscrew the cable gland from the transmitter
cover. See Figure for the location of the cable
gland.

3. Align the nut with the opening inside the
transmitter cover, and insert the adaptor body into
the transmitter conduit opening.

Figure 3: Conduit Adaptor

4. Manually tighten the adaptor into the nut, turning
in a clockwise direction.

5. Tighten the adaptor onto the adaptor body, turning
in a clockwise direction.

Mounting

About this task:

CAUTION

Electric Shock.Disconnect the power supply before
making electrical connections to avoid electric shock.
décharge électrique.Débrancher l'alimentation
avant de réaliser tout raccordement électrique afin
d'éviter tout risque de décharge électrique.

Location Considerations

• Install the transmitter in a place that receives minimal
direct sunlight.

• Avoid placing the transmitter near windows, air
conditioning units, or other heat and moisture sources
such as cooling towers.

• Install the transmitter at least 8 ft (2.5 m) above the
ground.

Important: To minimize the time spent working
on a ladder, prepare the transmitter configuration
and wiring before mounting the transmitter.

Figure 4: Preparing the Transmitter for Mounting

1. Loosen the six captive screws that hold the
transmitter cover in place.

2. Be sure the DIP switches are set to the desired
setting. See DIP Switch Settings.

3. Route the power and signal cable through the cable
gland or the conduit adaptor to the screw terminals,
and connect the wires.

4. Disconnect the terminal block by pulling it away from
the component board.

5. Adjust the cable length between the cable gland
and the terminal block. Make sure the cover closes
without leaving a loop within the transmitter.

6. Tighten the cable gland or conduit adaptor.

Important: Do not attach the cover to the
transmitter until the transmitter has been
mounted on the pole or wall.

Pole Mounting

About this task:

Important: We recommend a pole diameter of

2-11/32 to 3-3/32 in. (25 to 60 mm) if you use the
supplied clamp and screws.

To mount the Hx-68P3 Series Outside Humidity and
Temperature Transmitter to a pole:

1. Attach the clamp to the pole with the set screw. See
Figure 5.

2. Align the transmitter mounting bracket with the
holes on the clamp, and insert the screws through
the holes of the transmitter mounting bracket and
into the clamp.

Hx-68P3 Series Outside Humidity and Temperature Transmitters Installation Guide 3