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

Figure 5: Pole Installation

3. Tighten the screws securing the transmitter
assembly onto the pole.

4. Plug in the screw terminal block (terminal screws
facing the transmitter cover), close the cover, and
tighten the cover screws. See Figure 4 for plugging
in the terminal block and attaching the cover.

5. Secure the cable to the pole using cable ties.
Incorporate a drip loop below the cable gland to
prevent water from running into the transmitter
along the cable.

Figure 6: Securing Cable to a Pole

2. Insert the anchors into the holes.

3. Align the transmitter up to the holes, and insert the
screws through the holes and into the anchors.

Figure 7: Wall Installation, in. (mm)

4. Tighten the screws securing the transmitter onto
the wall.

5. Plug in the screw terminal block (terminal screws
facing the transmitter cover), close the cover, and
tighten the cover screws. See Figure 4 for plugging
in the terminal block and attaching the cover.

6. Secure the cable to the wall using cable ties.
Incorporate a drip loop below the cable gland to
prevent water from running into the transmitter
along the cable.

Figure 8: Securing Cable on a Wall

Wall Mounting

About this task:

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

1. Drill two holes for the wall plugs 3-15/16 in.(100
mm) apart.

Hx-68P3 Series Outside Humidity and Temperature Transmitters Installation Guide4

Wiring

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.

Figure 9: HT-68P3-0N000 Wiring

Figure 10: HE-68P3-0N000 Wiring

Troubleshooting

Analog Output Error State

The output channel is in a defined error level instead of
the measured result in two situations.

• The transmitter detects a measurement malfunction
such as a damaged sensor or unfavorable
environmental conditions.

• The measured values are outside of the scaled output
range. See Analog Output Overrange Behavior.

The error level depends on the output type.

• For a 0 to 10 V output, the error level is 11 V.

• For a 4 to 20 mA output, the error level is 3.6 mA.

The transmitter resumes normal operation of the analog
outputs when the cause of the error state is removed.

Analog Output Overrange Behavior

The Analog outputs have a defined behavior when the
values measure by the transmitter are outside the scaled
analog output range.

• The output is clipped at the end of the range.

• The output is set to the error state when the measured
value is 5% outside of the scaled range.

• The output resumes normal function when the
measured value is back on the scaled range.

Calibration

There are no calibration adjustments to make for this
device.

Repair Information

If the Hx-68P3 Series Outside Humidity and Temperature
Transmitter fails to operate within its specifications,
replace the unit. For a replacement transmitter, contact
the nearest Johnson Controls® representative.

Hx-68P3 Series Outside Humidity and Temperature Transmitters Installation Guide 5

Technical specifications

Table 3: Hx-68P3 Series Outside Humidity and Temperature Transmitters technical specifications

Specification Description Range

Temperature -40 to 140 ° F (-40 to 60 ° C)Operating Conditions

Humidity 0 to 100% RH

Relative Humidity

Temperature

Dewpoint ±1.6 ° F (±0.9 ° C)

Wet Bulb ±1.3 ° F (±0.7 ° C)

Enthalpy

Ingress Protection IP65

Maximum Wind/Flow Speed 98.42 ft/s (30 m/s)

Storage Temperature -40 to 140 ° F (-40 to 60 ° C)

Current
Output(HT-68P3-0N000) (Two­Wire)

Voltage Output
(HE-68P3-0N000) (Three-Wire)

Wire Size

Electromagnetic Compliance EN61326-1 Industrial Environment

Standard Housing Color White (RAL9003)

Compliance

Measurement range 0 to 100% RH

Accuracy: Temperature
Range50 to 86°F (10 to 30°C):0
to 90% RH90 to 100% RH

Accuracy: Temperature
Range-4 to 50°F (-20 to 10°C)86
to 140°F (30 to 60°C):0 to 90%
RH90 to 100% RH

Accuracy: Temperature
Range-40 to -4°F (-40 to -20°C):0
to 100% RH

Stability in typical HVAC app. ±2% RH over 2 years

Measurement range -40 to 140°F (-40 to 60°C)

Accuracy at 68°F (20°C) ±0.54°F (±0.3°C)

Temperature dependance ±0.01°C/°C

Temperature sensor Pt1000 RTD Class F0.1 IEC60751

Accuracy at 68°F (20°C) and
80% RH

Outputs 4 to 20 mA, loop powered

Loop resistance 0 to 600 ohm

Supply voltage 20 to 28 VDC at 600 ohm load;10 to 28 VDC at 0

Outputs 0 to 10 V

Load resistance 10k ohm minimum

Supply voltage 18 to 35 VDC; 24 VAC ±20%, 50/60 Hz

United States FCC compliant to CFR 47, Part 15, Subpart B, Class

Canada Under CAN/CSA-CEI/IEC CISPR 22:02, Class A

Europe CE Mark - Johnson Controls, Inc. declares that

Australia and New Zealand RCM Mark, Australia/NZ Emissions Compliant

±3% RH±5% RH

±5% RH±7% RH

±7% RH

±0.9 BTU/lb (±2kj/kg)

ohm load

16 AWG (1.5 mm2) maximum

A

this product is in compliance with the essential
requirements and other relevant provisions of the
EMC Directive.

The performance specifications are nominal and conform to acceptable industry standard. For application at conditions
beyond these specifications, consult the local Johnson Controls office. Johnson Controls shall not be liable for damages
resulting from misapplication or misuse of its products.

Hx-68P3 Series Outside Humidity and Temperature Transmitters Installation Guide6

Product warranty

This product is covered by a limited warranty, details of which can be found at www.johnsoncontrols.com/

buildingswarranty.

Software terms

Use of the software that is in (or constitutes) this product, or access to the cloud, or hosted services applicable to
this product, if any, is subject to applicable end-user license, open-source software information, and other terms
set forth at www.johnsoncontrols.com/techterms. Your use of this product constitutes an agreement to such terms.

Patents

Patents: https://jcipat.com

Single point of contact

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C/O CONTROLS PRODUCT MANAGEMENT
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WUXI JIANGSU PROVINCE 214028
CHINA

JOHNSON CONTROLS
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45143 ESSEN
GERMANY

JOHNSON CONTROLS
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MILWAUKEE WI 53202
USA

Contact information

Contact your local branch office: www.johnsoncontrols.com/locations
Contact Johnson Controls: www.johnsoncontrols.com/contact-us

Hx-68P3 Series Outside Humidity and Temperature Transmitters Installation Guide 7

© 2021 Johnson Controls. All rights reserved. All specifications and other information shown were current as of document revision and
are subject to change without notice.

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