Azbil HTY78 User manual

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Specifications/Instructions
Duct Temperature/Humidity Sensor
Duct Temperature Sensor
Duct Humidity Sensor
General
Duct temperature/humidity sensor Model HTY78X3 series
uses a platinum resistance temperature detector for a
temperature sensing element, and a polymer capacitive
humidity sensor (FP3™developed by Azbil Corporation) for a
humidity sensing element, enhancing accuracy and reliability
of temperature/humidity sensing.
With wide sensing range and great stability, Model HTY78X3
series is suitable for various applications including building
air conditioning (ducts and AHU) and meteorological
observation as well as industrial applications.
Model TY78X3 series temperature sensor and Model
HY78X3 series humidity sensor are also available.
AHU: Air handling unit
Features
●Wide temperature/humidity sensing range with high
accuracy.
●Excellent long-term stability.
●Highly environmental resistance.
●Quick response and high repeatability.
●Easy installation to a duct/AHU with quick-detachable
bracket (dedicated).
●Dust-proof and splash-proof housing (IEC IP54).
●No filter maintenance required:
Filterless probe of Model TY78X3Z series is the splash-
proof enclosure.
●CE Marking certified product:
The following models conform to all the applicable
standards of CE Marking.
- Model HTY78X3 series
- Model HY78X3 series
Model HTY7803
Model TY7813

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Safety Instructions
Please read instructions carefully and use the product as specified in this manual. Be sure to keep this manual near by for ready
reference.
Usage Restrictions
This product is targeted for general air conditioning. Do not use this product in a situation where human life may be affected. If
this product is used in a clean room or a place where reliability or control accuracy is particularly required, please contact our
sales representative. Azbil Corporation will not bear any responsibility for the results produced by the operators.
Warnings and Cautions
WARNING Alerts users that improper handling may cause death or serious injury.
CAUTION Alerts users that improper handling may cause minor injury or material loss.
Signs
Alerts users possible hazardous conditions caused by erroneous operation or erroneous use. The symbol inside 
indicates the specific type of danger.
(For example, the sign on the left warns of the risk of electric shock.)
Notifies users that specific actions are prohibited to prevent possible danger. The symbol inside graphically
indicates the prohibited action.
(For example, the sign on the left notifies that disassembly is prohibited.)
Instructs users to carry out a specific obligatory action to prevent possible danger. The symbol inside graphically
indicates the actual action to be carried out.
(For example, the sign on the left indicates general instructions.)
WARNING
Before wiring and maintenance, be sure to turn off the power to the product.
Failure to do so might cause electric shock.
After wiring, be sure to reattach the terminal cover.
Failure to do so might cause electric shock.
CAUTION (1/2)

Install the product in a location that satisfies the operating conditions (temperature, humidity, power, vibration, shock,
mounting direction, atmospheric condition, etc.) as listed in the specifications and use the product within the operating
ranges as listed in the specifications.
Failure to do so might cause fire or device failure.
Take anti-lightening measures based on regional and building characteristics.
Lightening might cause fire or critical damage to the products without the anti-lightening measures.
Installation and wiring must be performed by qualified personnel in accordance with all applicable safety standards.
All wiring must comply with applicable codes and ordinances.
Be sure to provide a circuit breaker for the power to the product.
To connect the wires to the screw terminals, use crimp terminal lugs with insulation.
Failure to do so might cause fire or device failure due to short circuit.
Firmly tighten the terminal screws.
Insufficient tightening of the terminal screws might cause fire or overheating.
Do not use unused/spare terminals on the product as relay terminals.
Doing so might cause malfunction.
If more than the rated power voltage is applied to the product, replace the product with new one for your safety.
Failure to do so might cause device failure or overheating.

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CAUTION (2/2)
Do not use transceivers or low power wireless devices near this product.
Doing so might cause radio wave interference and malfunction of the product.
Carefully press the rubber packing.
Your fingers holding the tool might slip causing injury if you put too heavy force on the rubber packing.
Do not disassemble the product.
Doing so might cause device failure.
Dispose of this product as industrial waste in accordance with your local regulations. Do not reuse all or a part of this
product.
IMPORTANT:
•Measuring accuracy of the product is preset before shipment. Output of the product, used even in normal air,
may be shifted depending on the operating conditions. Periodic inspection therefore is recommended.
•Corrosive gas or organic solvent may cause shift in output or damage the product. Before using the product in
abnormal atmosphere, consult with our salesperson.

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Model Numbers
Base model
number Type ⎯Power supply
Humidity
output
Temperature
output ⎯Description
HTY78 Duct temperature/humidity sensor
TY78 Duct temperature sensor
HY78 Duct humidity sensor
0 Long probe
1 Short probe
3 Fixed.
T 24 V DC / 24 V AC
Z No power required
D 24 V DC (two-wire)
0 No humidity sensing
1 1 V DC to 5 V DC
4 4 mA DC to 20 mA DC
0 No temperature sensing
4 4 mA DC to 20 mA DC
P RTD (Pt100)
K RTD (Pt1000)
00 Fixed.
RTD: Resistance temperature detector
Regarding the available model numbers, refer to the table below.
Available model numbers
Model number Type Power Humidity output Temperature output
HTY7803T1P00 Long probe
HTY7813T1P00 Short probe 24 V DC/AC 1–5 V DC RTD (Pt100)
HY7803T1000 Long probe
HY7813T1000 Short probe 24 V DC/AC 1–5 V DC N/A
HTY7803T4P00 Long probe
HTY7813T4P00 Short probe 24 V DC/AC 4–20 mA DC RTD (Pt100)
HY7803T4000 Long probe
HY7813T4000 Short probe 24 V DC/AC 4–20 mA DC N/A
TY7803Z0P00 Long probe
TY7813Z0P00 Short probe No power N/A RTD (Pt100)
TY7803Z0K00 Long probe
TY7813Z0K00 Short probe No power N/A RTD (Pt1000)
HTY7803D4400 Long probe
HTY7813D4400 Short probe 24 V DC (two-wire) 4–20 mA DC 4–20 mA DC
HY7803D4000 Long probe
HY7813D4000 Short probe 24 V DC (two-wire) 4–20 mA DC N/A
TY7803D0400 Long probe
TY7813D0400 Short probe 24 V DC (two-wire) 4–20 mA DC 4–20 mA DC
Optional parts
Part number Description
83157235-001 Mounting bracket with packing, indicator label for installation hole, M4 screws
83157240-004 Conduit mounting set (for Models HTY78X3D, HY78X3D, TY78X3D series)
for cable with ⌀11 mm to ⌀14 mm outer diameter
83157240-009 Conduit mounting set (for Model TY78X3Z series) for cable with ⌀9.4 mm to ⌀11 mm outer diameter
83104098-004 Seal connector (for Models HTY78X3D, HY78X3D, TY78X3D series)
for cable with ⌀10.5 mm to ⌀14.5 mm outer diameter
83104098-003 Seal connector (for Model TY78X3Z series) for cable with ⌀8.5 mm to ⌀12.5 mm outer diameter
DY8000A1001 Sensor shield for installing outdoors
DY3002A1005 Mounting bracket for installing in a instrument shelter (L-shape bracket)
Service parts
Part number Description
83162945-003 Filter set (filter and filter cap)

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Specifications (1/2)
Item Specification
Temperature -20 °C to 60 °CMeasuring range
Humidity 0 to 100 %RH (non-condensing)
RTD (Pt100) ±0.3 °C (at -20 °C to 60 °C)
* 1 mA applied current, 2 m/s air velocity
for Models HTY78X3TXP00, TY78X3Z0P00
RTD (Pt1000) ±0.5 °C (at -20 °C to 60 °C)
* 0.1–0.3 mA applied current, 2 m/s air velocity
for Model TY78X3Z0K00
Temperature
4–20 mA DC ±0.5 °C (at 0 °C to 50 °C) / ±0.3 °C (at 15 °C to 35 °C)
for Models HTY78X3D series, TY78X3D series
±3 %RH (within 30 %RH to 70 %RH range, at 25 °C)
Measuring accuracy
Humidity
±5 %RH (within 20 %RH to 80 %RH range, at 15 °C to 35 °C)
100 Ω/ 0 °C (RTD (Pt100) conforming to JIS C 1604 Class A)
for Models HTY78X3TXP00, TY78X3Z0P00
1000 Ω/ 0 °C (RTD (Pt1000) equivalent to JIS C 1604 Class A)
for Model TY78X3Z0K00
Temperature
4 mA to 20 mA DC (two-wire, liner to -20 °C to 60 °C)
* Maximum allowable load: 500 Ω
for Models HTY78X3D series, TY78X3D series
1 V DC to 5 V DC (linear to 0 %RH to 100 %RH)
* Input impedance of the controller connected: Min. 10 kΩ
for Models HTY78X3T1P00, H78X3T1000
4 mA DC to 20 mA DC (linear to 0 %RH to 100 %RH)
* Maximum allowable load: 300 Ω
for Models HTY78X3T4P00, HY78X3T4000
Output signal
Humidity
4 mA DC to 20 mA DC, two-wire (linear to 0 %RH to 100 %RH)
* Maximum allowable load: 500 Ω
for Models HTY78X3D series, HY78X3D series
Within 1 min.
for Model TY78X3Z series
Temperature
Within 4 min.
for Models HTY78X3T series, HTY78X3D series, TY78X3D series
Time constant
(at 2 m/s air velocity)
Humidity 1 min. or less (at constant temperature)
24 V AC +10/-15 % (50 Hz/60 Hz), 24 V DC ±10 %
for Models HTY78X3T series, HY78X3T series
Power supply
24 V DC ±10 %
for Models HTY78X3D series, HY78X3D series, TY78X3D series
0.23 VA per 1 V DC to 5 V DC output:
for Models HTY78X3T1X00, HY78X3T1000
24 V AC power
1.0 VA per 4 mA DC to 20 mA DC output
for Models HTY78X3T4X00, HY78X3T4000
170 mW per 1 V DC to 5 V DC output
for Models HTY78X3T1X00, HY78X3T1000
800 mW 4 mA DC to 20 mA DC output
for Models HTY78X3T4X00, HY78X3T4000
Power consumption
24 V DC power
550 mW per output point 4 mA DC to 20 mA DC output
for Models HTY78X3D series, HY78X3D series, TY78X3D series
Insulation resistance Min. 500 V DC, 20 MΩ(between the housing and terminals)
Withstand voltage 500 V AC applied for 1 min. with max. of 1 mA leakage current
(between the housing and terminals)
Environmental conditions Rated operating
condition Limit operating conditions Transport/storage
conditions
Ambient temperature -20 °C to 60 °C -20 °C to 60 °C -30 °C to 70 °CFor temperature
measuring Ambient humidity 0 %RH to 100 %RH
(non-condensing)
0 %RH to 100 %RH
(non-condensing)
5 %RH to 95 %RH
(non-condensing)
Ambient temperature -5 °C to 55 °C-20 °C to 60 °C -30 °C to 70 °CFor humidity
measuring Ambient humidity 0 %RH to 100 %RH
(non-condensing)
0 %RH to 100 %RH
(non-condensing)
5 %RH to 95 %RH
(non-condensing)
Vibration 4.9 m/s2(10 Hz to 150
Hz)
4.9 m/s2(10 Hz to 150 Hz) 9.8 m/s2(10 Hz to 150 Hz)
(in packaged state)
Air velocity ⎯0 m/s to 15 m/s ⎯
JIS: Japanese Industrial Standards

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(2/2)
Item Specification
Enclosure rating Housing IEC IP54 (dust-proof and splash-proof)
* The specified water-proof gland and multi-core cables must be used. OR
The specified cable conduit must be used.
* Enclosure rating of the Probe of Model TY78X3Z series is IEC IP24.
Color Housing Gray
Housing 20 % GF containing Polycarbonate resinMaterials
Filter cap Modified PPE resin, gray
Approx. 240 g
for Models HTY7803 series, HY7803 series, TY7803 series (long probe type)
Weight
Approx. 210 g
for Models HTY7813 series, HY7813 series, TY7813 series (short probe type)
Installation onto an duct or AHU, in an instrument shelter (with the dedicated bracket)
Wiring length Max. 100 m
Connection Terminal block connection
AHU: Air handling unit
IEC: International Electrotechnical Commission
PPE: Polyphenylene ether
CE Marking Conformity
Models HTY78X3 series and HY78X3 series comply with the following Electromagnetic Compatibility (EMC).
EN61326-1 Class B, Table 1 (For use in a basic electromagnetic environment)
(CISPR11: 2003, EN61000-4-2, EN61000-4-3, EN61000-4-4, EN61000-4-5, EN61000-4-6)
Note:
Model TY78X3 series is "equipment which is inherently benign in terms of electromagnetic compatibility" and "is excluded from the scope of
the EMC Directive."
Guide for the EMC Directive 2004/108/EC (8th February 2010)

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Dimensions
Models HTY7803, TY7803, HY7803 series
Figure 1. Dimensions: Models HTY7803/TY7803/HY7803 (mm)
Models HTY7813, TY7813, HY7813 series
Figure 2. Dimensions: Models HTY7813/TY7813/HY7813 (mm)
Mounting bracket Part No. 83157235-001 (optional)
Figure 3. Dimensions: Part No. 83157235-001 (mm)
⌀30
25
50
60
62.5
72.3
40
60
3.3
70
247.6 51.3
45.6 67.3
113.5
110
⌀20
70
108.6 51.3
45.6 67.3
113.5
110
⌀20

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A
ir flow
Insulating
material
Installation
CAUTION

Install the product in a location that satisfies the operating conditions (temperature, humidity, power, vibration, shock,
mounting direction, atmospheric condition, etc.) as listed in the specifications and use the product within the operating
ranges as listed in the specifications.
Failure to do so might cause fire or device failure.
Installation and wiring must be performed by qualified personnel in accordance with all applicable safety standards.
Do not put load or weight on the product.
Doing so might damage the product.
Installation requirements
●Select a location where the typical temperature and humidity of the process fluid can be measured at the specified air
velocity.
●Make sure that the entire probe is immersed in the process fluid. Also, make sure that airflow passes perpendicular to the
side of the probe.
●Leave adequate maintenance clearance in front of the housing cover.
●When installing in steam-heating AHU, make sure the probe is not directly exposed to the high-temperature steam.
The high-temperature steam might exceed the probe limit operating condition.
AHU: Air handling unit
●Do not allow condensation especially when installing the probe pointing upward.
Condensation water that remains in the filter cap slits might cause measuring error till the filter cap becomes dried.
IMPORTANT:
When the duct sensor is faulty, reduced output may cause over-humidification. Provide safety measure on the
controller in connection.
Installing Models HTY7803, TY7803, and HY7803 series
(onto duct for general air conditioning)
1) Prepare the dedicated mounting bracket.
Attach the indicator label for mounting hole at the probe
mounting position on a duct, and open a mounting hole.
Figure 4. Indicator label on the duct
2) Mount the mounting bracket onto the duct so that the
longer cylindrical part overhangs from the duct. Fix the
mounting bracket with accessory M4 screws.
Figure 5. Mounting bracket on the duct
3) Wrap the duct with an insulating material.
(If the duct has been already wrapped with an insulation
material, partially remove the material for mounting the
bracket. Fill the clearance between the bracket and the
duct with the insulating material after mounting the
bracket.)
Figure 6. Duct and the mounting bracket
wrapped with insulating material
A
irflow
Duct
Indicator label
A
ir flow
Duct
Packing
Mounting
bracket

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4) Release the stopper of the duct sensor by turning the
stopper 45° (from "a" to "b" shown in Fig. 7). Then, insert
the probe into the bracket and engage the tabs of the
probe with the notches of the bracket.
Figure 7. Mounting the duct sensor onto the duct
(with the mounting bracket)
5) Completely insert the probe, and lock the stopper of the
duct sensor by turning the stopper 45° (from "b" to "a"
shown in the figure below).
Figure 8. Locking the duct sensor stopper
Installing Models HTY7813, TY7813, HY7813 series
(onto AHU, in instrument shelter, etc.)
1) Prepare the dedicated mounting bracket. Attach the
indicator label for mounting hole to the probe mounting
surface, and open a mounting hole. (Skip this step for
installing the duct sensor using the optional L-shape
bracket.)
Figure 9. Indicator label on the AHU
2) Mount the mounting bracket onto the duct so that the
shorter cylindrical part overhangs from the mounting
surface. Fasten the mounting bracket with accessory
M4 screws.
Figure 10. Mounting bracket on the panel
3) Release the stopper of the duct sensor by turning the
stopper 45° (from "a" to "b" shown in Fig. 7). Then, insert
the probe into the bracket and engage the tabs of the
probe with the notches of the bracket.
Figure 11. Mounting the duct sensor onto the AHU/L-shape bracket
(with the mounting bracket)
4) Completely insert the probe, and lock the stopper of the
duct sensor by turning the stopper 45° (from "b" to "a"
shown in the figure below).
Figure 12. Locking the duct sensor stopper
Stopper
Duct sensor
(Long probe type)
a b
Turn 45°.
Engage.
Tab
Notch
Mounting surface
(AHU panel/mounting plate inside instrument shelter)
Indicator label
Mounting
bracket
Side view
Packing
Stopper
Duct sensor
(Short probe type)
a
b
Turn 45°.
Tab
Notch
Engage.
b a
b a
Mounting surface
(AHU panel/mounting plate or the optional
L-shape bracket inside instrument shelter)

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Wiring
WARNING
Before wiring and maintenance, be sure to turn off the power to the product.
Failure to do so might cause electric shock.
After wiring, be sure to reattach the terminal cover.
Failure to do so might cause electric shock.
CAUTION
Installation and wiring must be performed by qualified personnel in accordance with all applicable safety standards.
All wiring must comply with applicable codes and ordinances.
Be sure to provide a circuit breaker for the power to the product.
To connect the wires to the screw terminals, use crimp terminal lugs with insulation.
Failure to do so might cause fire or device failure due to short circuit.
Firmly tighten the terminal screws.
Insufficient tightening of the terminal screws might cause fire or overheating.
Do not use unused/spare terminals on the product as relay terminals.
Doing so might cause malfunction.
Precautions for wiring
●For power wiring and temperature/humidity output wiring, 1.25 mm² or 2 mm² shielded multi-core cables (JCS CVV-S
cables) are recommended.
- Be sure to ground the shielding on the controller side.
- For Model HTY78X3D/HY78X3D/TY78X3D series, ground the shielding on the duct sensor side as well.
- If dust-proof and splash-proof enclosure are not required,
1.25 mm² or 2 mm² JIS IV cable can be used for power wiring and temperature output wiring, and 1.25 mm² shielded
cable can be used for humidity output wiring.
- The maximum wiring length is 100 m.
JCS: Japanese Electric Wire & Cable Makers’ Association Standards
●Do not connect the cable for power supply to the temperature output terminals.
Doing so will generate smoke.
●Always check wiring before supplying power.
Do not allow the 24 V AC transformer for the duct sensor to supply the power to any other devices.
●Because the temperature sensor model with RTD (Pt1000) output is two-wire, the wire resistance will cause measuring
error. For instance, 1.25 mm2size wire causes approx. 0.1 °C measuring error every 10 m. Correct the measuring error by
setting the controller in connection.

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Transformer for the duct humidity sensor / the duct temperature/humidity sensor
IMPORTANT:
Use isolated transformer to supply 24 V AC power.
Single duct humidity sensor or duct temperature/humidity sensor must be powered by a single 24 V AC
transformer. If the multiple duct sensors or the duct sensor and other devices are powered by a single 24 V AC
transformer, the common wiring will form a loop, and the duct sensor will get damaged.
24 V AC transformer:
24 V DC Transformer:
Two duct humidity sensors (or duct temperature/humidity sensors) (Model HTY78X3T/HY78X3T series) powered by a single
transformer
For wiring of the duct temperature/humidity sensor / duct humidity sensor two-wire 4–20 mA type (Model HTY78X3D/HY78X3D
series), refer to the wiring diagram Fig 26. Single duct sensor must be powered by single 24 V DC transformer.
Figure 15. Good wiring example: Two duct humidity sensors powered by a single 24 V DC transformer
Notes for signal wiring
Induction current flowing from the duct humidity sensor or the duct temperature/humidity sensor to the controller input circuit and
inadequate time constant of the controller might generate noise. To prevent noise, see the following.
•Use a controller with low pass filter (40 dB or higher removal ratio in normal mode) that receives signals from the duct
humidity sensor or the duct temperature/humidity sensor.
•For insufficient removal ratio, provide an isolator on the controller input wiring.
Note:
No problem will occur for connecting the duct humidity sensor or duct temperature/humidity sensor to our controller.
IMPORTANT:
•Select the power supply for the duct sensor based on the allowable load (maximum current and power
consumption)
•Do not use the transformer Model RYY792D (24 V DC power) for the duct temperature/humidity sensor / duct
humidity sensor Model HTY78X3T/ HY78X3T with 4-20 mA output.
Insufficient capacity will cause sensor malfunction.
Two duct humidity sensors (or duct temperature/humidit
y
sensors) powered by a single transformer
Bad wiring
Common
wiring
* Common wiring forms a loop.
* The above figure shows a wiring example of Model HY78X3T.
Figure 13. Bad wiring example: Two duct humidity sensors powered
by a single 24 V AC transformer
24 V AC Controller
Duct humidity sensor
∼+
∼
+
+ +
⊥- -
--
⊥
Duct humidity sensor
24 V AC Controller
∼
∼
+ +
++
- -
- -
⊥
⊥
Two duct humidity sensors (or duct temperature/humidity
sensors) separately powered by two transformers
Good wiring
* Common wiring does not form a loop.
* The above figure shows a wiring example of Model HY78X3T.
Duct humidity sensor
Duct humidity sensor
Figure 14. Good wiring example: Two duct humidity sensors
separately powered by two 24 V AC transformers
Good wiring
24 V DC Controller
∼
+
∼
+
+ +
⊥
- -
--
⊥
+
-
Duct humidity sensor
Max. 0.022 μF
Duct humidity sensor
* Though common wiring forms a loop, common
mode noise will affect a little.
* For connecting terminals [-] and [E], use powe
r
with 0.022 μF or lower capacitive coupling.
* The above figure shows wiring example o
f
Model HY78X3T.

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Wiring port
Seal connector
(optional)
Wiring procedure
1) Remove the front cover.
Detach the front cover while pressing the release tab of
the case. (See "a" in Fig 16.) At this time, tilt the front
cover more than 30°. (See "b" in Fig 16.) Then lift the
front cover to remove. (See "c" in Fig 16.)
Figure 16. Detaching the front cover
2) Lead the cable through the wiring port.
Seal connector connection
Prepare the appropriate seal connector (optional)
depending on the number of the conductors. Screw the
threaded seal connector onto the wiring port and lead the
cable into the duct sensor through the port.
Figure 17. Seal connector connection
Conduit connection
Prepare the appropriate conduit mounting set (optional),
depending on the number of the conductors.
Temporarily screw the conduit connector and the
attachment, and select an O-ring appropriate for the
cable.
Figure 18. Conduit connection (1/2)
Lead the cable into the duct sensor through the port, and
screw the attachment onto the wiring port. Position the
conduit connector so that its conduit set screws can be
easily tightened, and then tighten the conduit nut..
Figure 19. Conduit connection (2/2)
3) Connect the conductors.
Connect the conductors to the terminals, and attach the
front cover to the case.
Figure 20. Attaching the front cover
4) Then, tighten the seal connector (for the duct sensor with
the seal connector connection).
Figure 21. Tightening the seal connector
a. Press.
Release tab
b. Open.
c. Detach.
Front cove
r
Case
A
ttachment
Conduit connector
(
DN 25
)
Conduit nut
O-ring
Attachment
Conduit fixing scre
w
Conduit nut
Pull.
Seal the wiring port.
Conduit connector
(DN 25)
Straight box connector
(DN24–DN25)
Fasten.

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Wiring diagrams
Terminal wiring diagrams: Models HTY78X3T and HY78X3T series (24 V AC/DC power type)
Terminal wiring diagrams: Model TY78X3Z series (No power type)
Wiring diagrams: Models HTY78X3D, HY78X3D, and TY78X3D series with the controllers
Figure 26. Wiring example: Duct temperature/humidity sensor, duct temperature sensor, duct humidity sensor
with 4-20 mA temperature and/or humidity output, 24 V DC power
24 V AC/DC
1-5 V DC /
4-20 mA DC
Pt100
(+)
(-)
+
-
A
B
B
Powe
r
su
pp
l
y
Humidit
y
Temp.
1
2
3
4
5
6
7
∼
⊥
Figure 22. Terminal wiring: Duct temperature/humidity sensor
with RTD (Pt100) output , 1-5 V/4-20mA humidity output,
24 V AC/DC power
Models HTY7803T1P00, HTY7803T4P00,
HTY7813T1P00, HTY7813T4P00
(7 conductors)
Figure 23. Terminal wiring: Duct humidity sensor
with 1-5 V/4-20mA humidity output,
24 V AC/DC power
Models HY7803T1000, HY7803T4000,
HY7813T1000, HY7813T4000
Pt100
A
B
B
Temp.
1
2
3
Figure 24. Terminal wiring: Duct temperature sensor
with RTD (Pt100) output , no power
Models TY7803Z0P00, TY7813Z0P00
(3 conductors)
Pt1000
A
B
Temp.
1
2
Figure 25. Terminal wiring: Duct temperature sensor
with RTD (Pt1000) output , no power
Models TY7803Z0K00, TY7813Z0K00
(2 conductors)
Not used
H+
H-
T+
T-
Humidity
1
2
- + - +
Controller
Controller
24 V DC
0 V 100/200 V AC
24 V DC power
(Model RYY792D)
24 V DC power
(Model RYY792D)
Temp.
4
5
24 V DC
0 V
Models HTY78X3D4400, HY78X3D4000,
TY78X3D0400
100/200 V AC
24 V AC/DC
1-5 V DC /
4-20 mA DC
(+)
(-)
+
-
Powe
r
su
pp
l
y
Humidity
1
2
3
4
∼
⊥
(4 conductors)
Not used

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Inspection and Maintenance
Since Models HTY78X3, HY78X3, and TY78X3 series are factor-inspected and -calibrated for high accuracy, no field calibration
is necessary when these products are installed. For inspection and maintenance, follow the maintenance instructions below:
Periodic inspection
Periodically inspect these products for its sensing accuracy. Set the period between inspections based on how much
atmospheric dust and other contaminants are contained in the installation environment.
Check that if the filter is clogged with dust and other contaminants, and clean the filter.
Troubleshoot
If any problem occurs during operation, refer to the following table for appropriate solutions.
Troubleshooting
Problems Check points Solutions
Loose wiring Tighten the terminals.
Disconnected wiring Re-perform wiring.
Power supply voltage
●No output
●Unstable output
Duct sensor main unit damages Replace the duct sensor.
Slow response to output Moisture/condensation on the duct sensor 1. Detach the duct sensor from the bracket.
2. Remove the filter cap and the filter.
3. Air-dry the duct sensor in a clean air.
Inappropriate installation location Refer to Installation section and check if the installation
location meets the requirements.
Clean the filter.
Replace the filter.
Perform single-point calibration.
Error in output
Dust and contamination on the duct sensor
main unit
Replace the duct sensor.
Filter replacement
WARNING
Before wiring and maintenance, be sure to turn off the power to the product.
Failure to do so might cause electric shock.
IMPORTANT:
Do not to touch the print board and other parts when these are not covered by the filter cap or the filter.
Doing so might damage these parts.

AB-5961
15
1) Prepare the new filter set (optional) for replacement.
Loosen the old filter cap and filter and remove from the
duct sensor.
Figure 27. Filter cap removal
2) Before attaching the new filter, check that the rubber
packing sealing the sensing element is not raised from
the probe, as shown in Fig. 28.
Figure 28. Rubber packing position
For rubber packing raised, press it using a slotted
screwdriver as shown in Fig. 29.
Figure 29. Pressing rubber packing
CAUTION

Carefully press the rubber packing.
Your fingers holding the tool might slip causing
injury if you put too heavy force on the rubber
packing.
IMPORTANT:
Carefully use a slotted screwdriver or other tools
while replacing the filter.
Failure to do so might damage the electronic
components and rubber packing.
3) Attach the new filter and then the new filter cap to the
duct sensor.
Figure 30. Attaching new filter and filter cap
4) Hand-tighten the filter cap.
Figure 28. Tightening new filter cap
Press rubber packing using a
tool such as a slotted
screwdriver to completely
seal..
Press
Filter cap
(The filter inside the cap will
be removed as well.)
Loosen.
Tighten.
Filter cap
Filter cap
Filte
r
1.
2.
1. Attach the filter.
2. Attach the filter cap.
Rubber packing:
not raised from the probe to
completely seal the element.
Rubber packing:
raised from the probe.
Sensing element may not
completely be sealed.
Sensing
element
Sensing
element
Good position of
rubber packing
Good position of
rubber packing

AB-5961
Specifications are subject to change without notice.
Building Systems Company
http://www.azbil.com/
Rev. 7.0 Sep. 2015 AB-5961
(J: AI-5961 Rev. 7.2) Printed in Japan.
16
Humidity single-point calibration for Models HTY78X3 and HY78X3 series
When you find an error in the humidity sensing output, calibrate the duct temperature/humidity sensor or the duct humidity
sensor with the adjustment knob located inside the duct sensor.
●The adjustment knob (VR1) is provided.
Turn clockwise to increase the output value and counterclockwise to decrease the output value.
●Use a reliable calibration instrument for the single-point calibration.
●Carefully handle the duct sensor and check the appropriate environment for the calibration.
●Calibrated digital multimeter is recommended to check output value.
Handling precautions
•After installation, leave the duct temperature/humidity sensor or duct humidity sensor for approx. 24 hours to adapt to
ambient conditions (atmospheric environment).
•While calibrating the duct sensor or tuning the controller in connection, do not allow the heat generated from human body
and/or appliances to affect the duct sensor or the controller.
Adjustment knob
(VR1)
Figure 32. Adjustment knob (VR1) of
Models HTY78X3T and HY78X3T series
A
djustment knob
(VR1)
Figure 33. Adjustment knob (VR1) of
Models HTY78X3D and HY78X3D series