Instruction manual
Hygrothermo transmitter THD-500 Series
No.THD51E1 2001.11
To prevent accidents arising from the use of this product, please ensure the operator using it
receives this manual.

Notes• This instrument should be used according to the specifications described in this manual.
If it is not used according to the specifications, it may malfunction or break down.
• Be sure to follow the warnings, cautions and notices. If not, serious injury or accidents may occur.
• The specifications of the THD-500 series and the contents of this instruction manual are subject to changewithout notice.
• Care has been taken to assure that the contents of this instruction manual are correct, but if there areany doubts, mistakes or questions, please inform our sales department.
• Any unauthorized transfer or copying of this document, in part or in whole, is prohibited.
• Shinko Technos is not liable for any damages or secondary damages incurred as a result of using
this product, including any indirect damages.

SAFETY PRECAUTIONS (Be sure to read these precautions before using our products)
The safety precautions are classified into categories: “Warning” and “Caution”.
Caution may be linked to serious
Depending on circumstances, procedures indicated byresults so be sure to follow the directions for usage.

Warning
Procedures which may lead to dangerous conditions and cause death or serious injury,
if not carried out properly.

CautionProcedures which may lead to dangerous conditions and cause superficial to medium injury or
physical damage or may degrade or damage the product, if not carried out properly.

SAFETY PRECAUTIONS (Be sure to read these precautions before using our products)
Warning
Turn the power supply to the instrument OFF before wiring.
Working with the power switched ON may result in an Electric Shock which could
cause severe injury or death.

Caution• Never disassemble, modify or repair THD-500 (hereafter,THD) yourself. In doing so, the THD
guarentee will become invalidated.
• Do not drop, shock or put a heavy load on the THD, as this may lead to malfunction or jamming.
[Use this instrument under the conditions below.]• A minimum of dust, and an absense of corrosive gases• No acid, alkali, organic solvent, flammable and expolsive gases• Few mechanical vibrations or shocks• No exposure to direct sunlight, an ambient temperature of 0 to 50 (32 to 122 ) without rapidtemperature change• An ambient non-condensing humidity of 90%RH or less
• The units away from large capacity electromagnetic switches or cables• No water, oil or chemicals or where the vapors of these substances can come into directcontact with the unit.
11. Model name
1.1 Model name
THD-500A: Wall mounting type
B: Flush
V: Wall mounting type
1.2 How model nameplate is indicated[Nameplate on the top of the terminal case cover][Terminal label in the terminal case]TA

HYGRO THERMO
TRANSMITTER
THD-500-TB

ATBBTEMPCHUMI

No. xxxxxx[Fig. 1.2-1][Fig. 1.2-2]

2. Names of the sections and external dimension (Unit: mm)[THD-500-A][THD-500-B]
1620

7Standard length L=200mm
Sold separately by 100mm each timeL98

G 3/4"(PF 3/4")

150.5

89

36.5

82

36.5

20

191975902-239.5
25
Terminalsection

Hole for pulling out
the connection wire

655

14 to19

18 to 23

Hole for pulling out
the connection wireProtection
tube

Terminal
sectionSensor cap[Fig. 2-1]

[Fig. 2-2]

1990

20

[THD-500-V]

90L

Standard length L=125mm
Sold separately by 50mm each time1547

18 to 23

36.5

Sensor cap

60

0.3

Terminal section Protection
tube
Hole for pulling out
the connection wire

Mounting hole 2-M4

[Fig. 2-3]
2

Protection
tube

Sensor cap

3. Mounting
3.1 Mounting environment
Select a corrosive-gas-free site with plenty of ventilation, where and stable humidity for measurement
can be obtained.
(Contact our sales office if you have questions.)• If there is a lot of corrosive gas around which may hasten deterioration of the humidity sensor,
it may cause measurement errors.
Select a site where there are no gases such as chloric, hydrochloric, sulfur dioxide, carbon
dioxide, nitric acid, ammonia, ethanol, methane and no cigarette smoke.
• Select a site where water, oil, chemicals and their vapors will not come in direct contact
with the instrument.
• Select a site with little dust.
• Select a site not exposed to direct sunlight or rapid temperature change. Make sure the site
has an ambient temperature 0 to 50 (32 to 122 ).
• Select a site where there are few mechanical vibrations or shocks when the THD is fixed.
• Select a site where humidity is in the range of 20 to 90%RH. (Set the waterproof filter [THF-500]
in a condensing environment, otherwise sensors may deteriorate.)• Keep the wire connected between the THD-500 and receiving instrument away from the large
capacity electromagnetic switches or cables through which large current is flowing.
3.2 Mounting method(1) Mount the THD-500 (-A, -B, -V) vertically or horizontally. If it is mounted in other directions,water may enter the gap between the sensor cap and the protection tube, which may cause
malfunction of the sensor. [Fig. 3.2-1]
Mount the protection tube perpendicular to air flow and keep the THD-500 away from the wall
as far as possible (50mm or greater). However, make sure to mount the humidity sensor HD-S
in the direction as indicated by the diagrams [Fig. 3.2-2], [Fig. 3.2-3] and [Fig. 3.2-4].
(2) Securely mount the THD-500-A with the screws provided, THD-500-B with the nuts provided(PF3/4) and THD-500-V with the screws provided after removing the terminal case cover.
Refer to [Fig. 3.2-1], [Fig. 3.2-2] and [Fig. 3.2-3].
However, for the mounting of THD-500-B, optional compression fitting (CF) or loose flange (LF)
can be used as well.
(3) After connecting the connection wire to the terminal, securely mount the humidity-proof connectorof the hole for pulling out connection wire, and rubber packing of the terminal case cover.
Otherwise the terminal section will rust and this may cause malfunction.
Set the waterproof filter THF-500 at the sensor part in a condensation environment.

○○○

×××

[Fig. 3.2-1]
3

n Mounting example[THD-500-A]

50mm or greater

50mm orgreater

Direction of mounting of
humidity sensor HD-S

THD-500-A

Air flow[Fig. 3.2-2」[THD-500-B]

50mm or greater

Direction of mounting of
humidity sensor HD-S
THD-500-B
Air flow[Fig. 3.2-3][THD-500-V]

50mm or greater

Direction of mounting of
humidity sensor HD-S

50mm orgreater
THD-500-V
Air flow[Fig. 3.2-4]

4

4. Wiring connectionWarningTurn the power supply to the instrument OFF before wiring.
Working with the power switched ON may result in an Electric Shock which could
cause severe injury or death.

Caution• For the connection of THD-500 terminals, use a solderless terminal with an insulation sleeve that fits
to the M3 screw, and turn the power supply to the instrument OFF before wiring.

• Tighten the M3 screw with specified torque or less.
The M3 screw may be damaged if tightened with greater than the specified torque,• When wiring, keep the input wire (RTD, voltage 0 to 1Vdc) of the THD-500 away from the AC source
wire and the load wire.
4.1 Terminal arrangement
A: Power for the humidity sensor 5Vdc (+)
THD-500
Hygrothermo transmitter

B: Output for the humidity sensor 0 to 1Vdc (+)(Equivalent to 0 to 100%RH)

TD-S
HD-S

TA

TB

TB

A

B

C: Humidity output common terminal, power sourcecommon terminal (–)

C

TA:
AB

B

5Vdc

1Vdc

0Vdc

TB:

Output for temperature sensor, Pt100 (3-wireTB:system output)

Power for humidity sensor[Fig. 4.1-1]

THD-500-B
Output for humidity sensor

n Hole for pulling out connection wire
Pass the connection wire through humidity-proof connector
and connect to the THD-500 terminals, then securely

Tighten thissecurely.

fasten the screws.
THD-500-B is used in the explanation of [Fig. 4.1-2].
THD-500-A and THD-500-V are connected in the same
way as the THD-500-B.
n Solderless terminal

TATB
TBABCTA
TB
TBAB
C[Fig. 4.1-2]

Use a solderless terminal with an insulation sleeve that fits to the M3 screw as shown below.
Solderless
Manufacturer
Model nameTightening torqueterminal
Nichifu Terminal Industries CO.,LTD.
1.25Y-3Y type
Japan Solderless Terminal MFG CO.,LTD. VD1.25-B3A
0.6N･mNichifu Terminal Industries CO.,LTD.
1.25-3Max. 1.0N･mRoundtype
Japan Solderless Terminal MFG CO.,LTD. V1.25-35

3.2mm5.8mm or less

5.8mm or less

3.2mm

[Fig. 4.1-3]
4.2 Wiring connection example
h Example of Temperature and humidity control using a power rectifier
THD-500

Hygrothermo transmitter
TATBＡTBＢＣ

Temperature side controller
2Power supply

3100 to 240Vacor24Vac/dc

Humidity side controller

Digital indicating controller
FCD-13A series

12354A 18

Output voltage

3Digital indicating controller
FCD-13Ａ series
0 to 1Vdc
input

200/230Vac

Power rectifier
R-101-H

B 20

7Power supply
100 to 240Vacor
24Vac/dc

100/115Vac

5Vdc

B 19

6・2Power supply

18
19[Fig. 4.2-1]
h Example of Temperature and humidity monitoring using the temperature indicatorand the exclusive indicator of the humidity sensor
ＴＨＤ－５００Hygrothermo transmitter
TATBTBＡＢＣThe exclusive receiving instrumentof the humidity sensor has a built-inpower source (5Vdc) for the humiditysensor.

181920ABB

Digital indicator
FIR-201-M

32Power supply
100 to 240Vacor
24Vac/dc

171819ABCDigital humidity indicator
FIR-201H-H

Temperature indicator

3Power supply
100 to 240Vacor
24Vac/dc

Humidity indicator[Fig. 4.2-2]
62

4.3 Exchanging temperature sensor and humidity sensor

Caution• Do not apply any sensors other than temperature sensor TD-S and humidity sensor HD-S.
• Keep the socket and sensor terminal clean.
If the socket or sensor terminal is stained, it is unable to measure correctly due to imperfect contact.
• Do not add extra force to the sensor or touch it with wet hands or hands with chemicals on them.
• Do not cleanse the sensor.
n How to change temperature sensor and humidity sensor
Hygrothermo transmitter (THD-500-A, -B, -V) is described as THD in the following explanation.
(1) Rotate the THD sensor cap in the direction of the arrow (counterclockwise), then pull it out directlywith the device set in a vertical position (although it has been depicted horizontally here for reasonsof space).

Sensor cap[Fig. 4.3-1](2) Pull out the deteriorated temperature sensor (TD-S) or humidity sensor (HD-S) in the direction of
the arrow with the device set in a vertical position (although it has been depicted horizontally herefor reasons of space).

Humidity sensor(HD-S)
Sensor terminal[Fig. 4.3-2]

Temperature sensor(TD-S)(3) Mount the new temperature sensor (TD-S) into the temperature sensor socket directly with thedevice set in a vertical position (although it has been depicted horizontally here for reasons ofspace).
There is no polarity for the temperature sensor (TD-S).
Do not touch the temperature sensor part, or it may cause errors.

Socket for
temperature sensor(TD-S)

Temperature sensor(TD-S)[Fig. 4.3-3](4) Insert the new humidity sensor (HD-S) directly into the socket for humidity sensor with thedevice set in a vertical position (although it has been depicted horizontally here for reasons ofspace).
However, since there is a set polarity for the humidity sensor (HD-S), insert the humidity sensor
into the socket to match the position matching mark to the contra-insertion protection pin.

Socket forhumidity sensor(HD-S)

Humidity sensor(HD-S)

Position matching markContra-insertion protection pin for
humidity sensor[Fig. 4.3-4]
7

(5) Insert the THD sensor cap with the device set in a vertical position (although it has been depictedhorizontally here for reasons of space) and set it by rotating it in the direction of the arrow (clockwise).

Sensor cap(Fig. 4.3-5)* NoteAll the sensors used for THD-500 (-A, -B, -V) are compatible.
They can be used without calibration when exchanging.

5. Specifications
5.1 Standard specifications
Specification

THD-500-A

THD-500-B

MeasuringTemperature: 0 to 50

range

Humidity: 20 to 90%RH

Type ofTemperature: Platinum thin film RTD (JIS Pt100 B class)elements

Humidity: Resistance value change type

Accuracy

Temperature:
Humidity:

Response time

THD-500-V(0.3 + 0.005[T]) (JIS C1604-1989 B class) (T: Measured temp.)

5%RH (at 10 to 50 )Temperature: 35 seconds (63.2% response)
Humidity: Within 2 minutes (3080%RH)

Hysteresis

Humidity: Within approx. 1%RH

OutputTemperature: 3-wire system 100

at 0 (JIS C1604-1989 B class)

Humidity: 0 to 1Vdc (equivalent to 0 to 100%RH)
Material

Main body: Aluminum die-cast, Color: Silver metallic coating
Protection tube: SUS304
Sensor cap: Polyacetal, Color: Black

External

Refer to Chapter “2. Names of the sections and external dimension”

dimension
Applicable

Temperature: 0 to 50

range

Humidity: 20 to 90%RH

Storage

Temperature: -20 to 60

environment

Humidity: 5 to 90%RH (No condensation)

Supply voltage

5Vdc (Supplied by exclusive power source R-101-H or by the exclusive receiving
instrument of the humidity sensor)

Mounting

Wall mounting

Flush

Wall mounting

WeightApprox. 500g

Approx. 550g

Approx. 450g

Accessories

Instruction manual, 1 copy Instruction manual, 1 copy

Instruction manual, 1 copy

Screw for mounting theNut for mounting the main

Screw for mounting themain body (material BS):body,1 set

main body (material BS):

MN

MN

6x20mm, 2 pieces

4x10mm, 2 pieces

Washer (material BS):

Washer (material BS):

WB-6, 2 pieces

WB-4, 2 pieces

Nut (material BS):
NA-6, 2 pieces85.2 Supplementary[For THD-500-B]
Protection tube : L=200mm (standard specification)
It can be extended by 100mm each time when manufactured.
Mounting method: Fixed by the compression fitting (CT) [Fig. 5.2-1]
Fixed by Loose flange (LF) [Fig. 5.2-2][Fig. 5.2-1][Fig. 5.2-2][For THD-500-V]
Protection tube: L=125mm (standard specification)
It can be extended by 50mm each time when manufactured.
[Common connection wire (L)Length of the connection wire (unit: m)

The connection wire has been connected to the THD-500 when shipped, andit can be extended by one meter each time.
[Example]
Option code [L5]: 5m length of connection wire is connected to the THD-500 when shipped.
[Waterproof filter]
Model name: THF-500 (Common to THD-500 series)
Material: Fluorine resin (Impermeability of water or dust, and designed not to clog)

25

35.5

External dimension

2490
5,5

[Fig. 5.2-3]
5.3 Replacement sensors
Temperature sensor: TD-S (Common to THD-500 series) Compatible, and no need to calibrate
after changing
Humidity sensor: HD-S (Common to THD-500 series) Compatible, and no need to calibrate
after changing

96. Troubleshooting
In order to keep accuracy, inspect and exchange the sensor part once a year depending on thedegree of pollution.
Also make sure that temperature sensor (TD-S) and humidity sensor (HD-S) are securely connectedto the socket before checking the items in the following table.
In the case of temperature measurement
Problem[] is blinking on thePV display of the receiving
instrument.

Presumed cause and solution• Is the connection wire connected to the terminals within the THD-500
securely?
Connect the wire securely.
• Is the sensor broken?
Exchange the sensor for the new one.
• Is there imperfect contact to the sensor?
When the sensor terminal has rusted, exchange the sensor for the newone.
Inquire at our sales office for repair if the contact at socket side hasrusted.

[] is blinking on thePV display of the receivinginstrument.

• Is the connection within the THD-500 (temperature sensor) correct?
Connect the wire properly.

An abnormal or unstablevalue is indicated on thedisplay of receivinginstrument.

• Read the instruction manual (6. Troubleshooting) of the receivinginstrument.

In the case of humidity measurement
Problem

Humidity output is not
activated from hygrothermotransmitter THD-500.

An abnormal value (Highhumidity) is indicated on
the receiving instrument
display.
An abnormal value (Lowhumidity) is indicated on
the receiving instrument
display.
The responsive time ofthe receiving instrument
is very slow.

Presumed cause and solution• Is the connection within the THD-500 correct?
Connect the THD-500 properly.
• Is there imperfect contact to the sensor?
When the sensor terminal has rusted, exchange the sensor for the newone.
Ask our sales office for repair if the contact at socket side has rusted.
• Is the sensor broken?
Exchange the sensor for the new one.
• Is the sensor wet or damp?
Dry the sensor.
• Are inorganic salt and the like adhered to the sensor?
Exchange the sensor for the new one.
• Is there dust clinging to the sensor?
Exchange the sensor for the new one.
• Has the sensor deteriorated after repetitively condensing?
Exchange the sensor for the new one.
• Is the site for the hygrothermo transmitter or wind speed at themeasuring site proper?
Change the hygrothermo transmitter measuring site to the proper one.

n When condensation occurs, 90%RH or greater output is kept until the condensation of the humiditysensor (HD-S) stops. (This is responsible for the deterioration of the humidity sensor.)
If the troubles occur other than the mentioned above, please inform our sales office or branch office.
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SHINKO TECHNOS CO.,LTD.
OVERSEAS DIVISION

Reg. Office : 2-48, 1-Chome, Ina, Minoo, Osaka, Japan
Mail Address : P.O.Box 17, Minoo, Osaka, Japan: http://www.shinko-technos.co.jp
URL
Tel : 81-72-721-2781: overseas@shinko-technos.co.jp
E-mailFax: 81-72-724-1760
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