Hioki 3641-20 Instruction Manual

INSTRUCTION MANUAL

3641-20

HUMIDITY LOGGER

Contents

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Contents

Introduction ................................................................................1

Inspection ..................................................................................1

Safety Notes ................................ ..............................................2

Usage Notes ..............................................................................3

1Overview 5

1.1 Product Overview ...............................................5

1.2 Parts Names .......................................................6

2 Measurement Preparations 7

2.1 Installing or Replacing the Batteries ................... 7

2.2 Power Save Function ......................................... 8

2.3 Setting Current Time .......................................... 9

2.4 Connecting the Humidity Sensor ...................... 10

3 Settings 11

3.1 Setting Items ....................................................11

3.2 Manual Setting ................................................. 13

3.3 Setting by the COMMUNICATION BASE ......... 14

3.4 Connecting the COMMUNICATION BASE

with the 3641-20 ...............................................15

3.5 Precautions ......................................................16

4 Specifications 17

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4.1 3641-20 HUMIDITY LOGGER ......................... 17

4.2 Temperature and Humidity Sensors .................20

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APPX

IDX

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Contents

5 Maintenance and Service 25

5.1 Cleaning ........................................................... 25

5.2 Repair and Servicing ........................................ 26

Introduction

Thank you for purchasing the HIOKI “3641-20 HUMIDITY LOG­GER”. To obtain maximum performance from the product, please
read this manual first, and keep it handy for future reference.

Inspection

Checking the contents of the package

When you receive the product, inspect it carefully to ensure that no
damage occurred during shipping. If damage is evident, or if it fails
to operate according to the specifications, contact your dealer or
Hioki representative.

The HUMIDITY SENSOR- - - - - - - - - - - - - - - - - - - - - - - - - - - - 1
LR03 alkaline battery (built into this unit) - - - - - - - - - - - - - - - - - 2
Instruction Manual- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1

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Before using the product

• Before using the product the first time, verify that it operates nor­mally to ensure that the no damage occurred during storage or
shipping. If you find any damage, contact your dealer or Hioki
representative.

• Before using the product, make sure that the insulation on the
sensor cable is undamaged and that no bare conductors are
improperly exposed. Using the product in such conditions could
cause an electric shock, so contact your dealer or Hioki repre­sentative for repair.

Shipping precautions

Use the original packing materials when reshipping the product, if
possible.

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Safety Notes

This product is designed to conform to IEC 61010 Safety
Standards, and has been thoroughly tested for safety prior to
shipment. However, mishandling during use could result in
injury or death, as well as damage to the pro duct. Be certain
that you understand the instructions and precautions in the
manual before use. We disclaim any re sponsibility for acci­dents or injuries not resulting directly from product defects.

Safety Symbols

This manual contains information and warnings essential for safe
operation of the product and for maintaining it in safe operating
condition. Before using the product, be sure to carefully read the
following safety notes.

In the manual, the symbol indicates particularly
important information that the user should read before
using the product.
This manual contains information and warnings essential
for safe operation of the product and for maintaining it in
safe operating condition. Before using the product, be
sure to carefully read the following safety notes.

Indicates DC (Direct Current).

The following symbols in this manual indicate the relative impor­tance of cautions and warnings.

Other Symbols

❖

*

Indicates that incorrect operation presents an
extreme hazard that could result in serious injury or
death to the user.

Indicates that incorrect operation presents a signifi­cant hazard that could result in serious injury or
death to the user.

Indicates that incorrect operation presents a possi­bility of injury to the user or damage to the product.

Advisory items related to performance or correct
operation of the product.

Indicates the reference.
Indicates terminology explained at the bottom of

the page.

Usage Notes

3

Follow these precautions to ensure safe operation and to obtain
the full benefits of the various functions.

• This product should be operated between -20 a nd 70°C (- 4 and
158

°F) and 80% RH.

• If used outside the specified environmental ranges for operation
(or storage), the sensor accuracy may deteriorate in less than
one year, and accurate measurement may not be possible.

• If used outside the specified environmental ranges for operation
(or storage), the operation of the unit cannot be guaranteed.

• When the HUMIDITY SE NSOR is not being used, seal it in a
plastic bag with a desiccating agent, and store in a dark, cool
place.

• Take care to avoid condensation. In particular, if there is a sud­den change of temperature (for example moving from a cold
place to a warm one), condensation is likely to occur.

• To avoid damage to the product, do not allow the product to get
wet, and do not use it when your hands are wet.

• Do not use t he product w here it may be exposed to corrosive or
combustible gases. The product may be damaged.

• Exposing the optical data transfer of the 3641-20 to light that
uses an AC power supply (e.g., fluorescent light) may cause the
3641-20 to malfunction. Depending on the intensity of the light,
move the 3641-20 away from the light source or cover the opti­cal data transfer.

• The protection rating (per EN60529) for the exterior of this
device is *IP54.

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*IP54:
This shows the degree of protection provided by the exterior of the device
against use in hazardous locations, entry of foreign matter, or penetration
by water.
"

5": Dust-resistant design prevents access to hazardous com ponents by

wires with diameters as small as 1.0 mm.

"

4": The equipment inside the case is protected from all directions against

the harmful effects of water splashes.

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• Testing monitor batteries installed in the unit may possibly be
weak. Replace batteries before extended measurement usage.

• Use only LR03 Alkaline batteries. Using manganese batteries
may not result in accurate measurements or proper communi­cation with the Communication Base.

• Unless otherwise specified, the temperature and humidity sen­sor described in this manual is a 9680 temperature and humid­ity sensor (including branch codes like 9680-01 and 9680-50).

Connecting Sensors and Cables to the Unit

Figure 1 shows improper connection of sensor or cable jack to connection termi­nal failing to display accurate measurement value. To properly connect sensor or
connection cable to the unit, securely insert cable jack as designated by triangle
marks S on both connection terminal and cable jack as shown in figure 2.
Be sure to verify that the measurement value is properly displayed.

OK

Figure 1

Push in it firmly

Figure 2

Product Overview

Overview 1

1.1 Product Overview

3641-20 HUMIDITY LOGGER enable temperature and humidity
measurement and recording at fixed intervals.
Data is saved in nonvolatile memory when batteries are weak or

removed for replacement. Further, since the product comes
equipped with a capacitive-type humidity sensor, it provides the fol­lowing features for humidity measurement:

•Sta

ble characteristics

• Wide measuring range

• Extended sensor life (deterioration-resistant)

• Fast response time

• Condensation-resistant (if condensation occurs, restore functionality

b

y drying out the device)

❖ 4 Specifications (page 17)

Recording Inter val and Maximum Recording Time

(Power save function: On)

Single 3641-20 records temperature and humidity each up to 8000 data.

INTVL REC time INTVL REC time
2 s 4 h 26 min 40 s 2 min 11 day 2 h 40 min
5 s 11 h 6 min 40 s 5 min 27 day 18 h 40 min
10 s 22 h 13 min 20 s 10 min 55 day 13 h 20 min
15 s 33 h 20 min 15 min 83 day 8 h
20 s 44 h 26 min 4 s 20 min 111 day 2 h 40 min
30 s 66 h 40 min 30 min 166 day 16 h
1 min 5 day 13 h 20 min 60 min 333 day 8 h

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Battery Life

The battery life varies depending on recording intervals.
* The table below lists the values when the power save function is

enabled. When this function is disabled, the battery lasts about
20 days.

* These estimated values (at 20

and do not guarantee battery life.

INTVL Battery life INTVL Battery life
2 s Approx. 20 days 1 m Approx. 90 days
10 s Approx. 45 days 2 m Approx. 180 days
30 s Approx. 50 days 5 m or more Approx. 1 year or more

°C) are intended only as a guide

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Parts Names

1.2 Parts Names

LCD

Displays measurement
value and settings.

Front Panel

REC/STOP button (pressing more than 1 second)

Starts or stops recording.

SELECT button

Selects interval in interval setting display.

Optical data transfer

Enables optical data transfer
to the COMMUNICATION BASE.

Rear Panel

Connecting
terminal

Connects the
HUMIDITY
SENSOR

INTERVAL button

Calls up interval setting display to
set interval.

Installing or Replacing the Batteries

Measurement Preparations 2

2.1 Installing or Replacing the Batteries

• After replacing the batter ies, replace the cover and screws
before using the product.

• Do not mi x old and new batteries, or different typ es of bat­teries. Also, be careful to observe battery polarity during
installation. Otherwise, poor p erformance or damage from
battery leakage could result.

• Do not touch board when replacing batteries. Touching
board may result in damage.

• Handle and dispose of batteries in accordance with local
regulations.

When exchanging the batteries, the circuit may sometimes short circuit
due to static electricity. As far as possible, do not touch the base board
with bare hands.

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Installing new batteries assures operation for more than three months.
(at 20 °C temperature, power save function: on, interval set at 1 minute)

Battery power indicator

Indicates remaining battery life reducing incrementally from right.
Indicates time to replace batteries.

Installing or Replacing the Batteries

1. Remove back cover screw to

remove cover.

2. Verify polarity and install two new

LR03 alkaline batteries.

3. Fit cover properly and tighten

screw.

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Power Save Function

2.2 Power Save Function

Display window is automatically turned off in approximately 15 sec­onds after last key entry. (Sleep)

However, while recording, "
conditions.

REC"/" "/" " mark shows each

Setting the Power Save Function

1. Connect the 3641-20 , C OMMUNICA-

TION BASE and personal computer.

2. Start up application software packaged

with the COMMUNICATION BASE.

3. Go to Communications on the menu

bar and select Power Save Options.
Choose Off to turn off power save
function.

Press any button to turn display on to display measurement value
or to set settings.
Note when interval setting display is on, sleep does not engage
even after 15 seconds has passed with no button press.
Initially, power save function is on.
If the power save function is disabled, life of the battery will be 20
days.

Changing power save settings initializes the product measurement
conditions (excluding measurement data).

❖ To connect the COMMUNICATION BASE with the 3641-20 and per-

sonal computer:
To install application software:

COMMUNICATION BASE Instruction Manual

❖ To use application software: Help

2.3 Setting Current Time

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Setting Current Time

After replacing batteries in the product current time must be set
when connecting with the COMMUNICATION BASE for the first
time.
See how to set current time in the COMMUNICATION BASE
instruction manual.

❖ COMMUNICATION BASE Instruction Manual

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Connecting the Humidity Sens or

2.4 Connecting the Humidity Sensor

To avoid damage to the unit, only connect the 9680 HUMIDITY SEN-

series or 9631 HUMIDITY SENSOR series with the product.

SOR

The product records temperature and humidity in 2 channels when
connected to 9680 HUMIDITY SENSOR series.
When connected to 9631 TEMPERATURE SENSOR series,
humidity measurement is not available.
When sensor is not connected, internal temperature sensor carries
out temperature measurement only

Connecting the Humidity Sensor

Securely insert sensor cable to
unit as designated by triangle
mark on connection term inal.

Do not connect sensor cable in
reverse.
Improper connection results in fail­ure to display accurate value.

.

Correct values will not be displayed even if the 9630 HUMID­ITY SENSOR (for the 3631 HUMIDITY LOGGER) is con­nected. Always use the 9680 HUMIDITY SENSOR series.

Setting Items

Settings 3

3.1 Setting Items

The 3641-20 stand-alone manual settings and settings in combina­tion with COMMUNICATION BASE with measurement conditions
stored in memory loaded from personal computer.

3641-20

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COMMUNICATION BASE

3641-20

(1) Start recording Yes Yes Yes
(2) Stop recording Yes No No
(3) Interval setting Yes Yes Yes
(4) Current time setting No Yes Yes
(5) Start control No Yes Yes
(6) Recording format No Yes Yes
(7) Comments No No Yes

Comment setting is available when personal computer is con­nected to the 3641-20 and the COMMUNICATION BASE.

3641-20+

COMMUNICATION

BASE

PC

COMMUNICATION

3641-20+

BASE+PC

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Setting Items

(1) Start recording

Start manual recording by pressing REC/STOP button for 1 second
or initiate by prescheduled start set using the COMMUNICATION
BASE.

Appears when time

scheduled start is
engaged

When batteries are weak, recording does not start.
During recording, weak battery interrupts recording.

(2) Stop recording

Stop recording by pressing REC/STOP button for 1 second.
Or recording stops automatically when data is full when set to
recording format: one time.

(3) Interval setting

Set interval with the product alone or using the COMMUNICA TION
BASE.
(Interval: 2/5/10/15/20/30 s, 1/2/5/10/15/20/30/60 min)

(4) Current time setting

❖ COMMUNICATION BASE Instruction manual

(5) Start control

Set specific recording date and time using the COMMUNICATION
BASE to engage time scheduled start. When time scheduled start
is engaged, clock icon appears in display.

(6) Recording format setting

Set recording format using the COMMUNICATION BASE.
Choose either one time or endless recording form at. Default set­ting is one time.
One time: Ends recording when data reaches.
Endless: Overwrites previously recorded data when data exceeds.

(7) Comments

Set comments entered by personal computer to the product using
the COMMUNICATION BASE. When sorting collected recording
data, comments are helpful.
Comment setting is available when personal computer is con­nected to both the 3641-20 and the COMMUNICATION BASE.

3.2 Manual Setting

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Manual Setting

When the power save function is enabled and the LCD display is
OFF, press any key to change the display to ON before operation.

(1) Interval setting

Press INTERVAL button to switch measurement value display to
interval setting display. ("INTVL" mark appears.)

SELECT button to designate interval.

Press
Press

INTERVAL button to complete setting.

(2) Starting and ending recording

Press REC/STOP button for 1 second to clear last recorded data
and start recording. ("

REC/STOP button for 1 second to stop record ing.

Press
When memory is full, recording automatically stops when recording
format: one time is selected.
When batteries are weak, recording does not start. During record­ing, weak batteries interrupt recording.

❖ 2.1 Installing or Replacing the Batteries (page 7)

When the auto save function becomes on while recording, the
measured value stops being displayed.

❖ 2.2 Power Save Function (page 8)

REC" mark appears.)

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1.

,

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Setting by the COMMUNIC ATI ON BASE

3.3 Setting by the COMMUNICATION BASE

COMMUNICATION BASE

Press INTERVAL button lightly to display LCD.

3641-20

2. When LCD shows "REC" mark or " " icon, press REC/

button for more than 1 second to stop recording.

STOP

During recording or waiting time before recording start time
data transfer cannot be established with the COMMUNICA
TION BASE.

3. Press INTERVAL button to display interval setting display.

("

INTVL" mark appears.)

4. Connect the COMMUNICATION BASE with the 3641-20.

❖ 3.4 Connecting the COMMUNICATION BASE with the 3641-20

(page 15)

5. Press the COMMUNICATION BASE SEND button for more

than 1 second to send data settings to the 3641-20.

Previously recorded the 3641-20 data is erased when recording is
resumed.
Be sure to load data to be saved to the COMMUNICATION BASE
or to personal computer before recording.

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Connecting the COMMUNICATION BASE with the 3641-20

3.4 Connecting the COMMUNICA TION BASE with the 3641-20

Align and insert the 3641-20 prongs to the COMMUNICATION
BASE slots and fasten the 3641-20 securely.

Logger prong

3641-20

COMMUNICATION BASE

Improper connection between the 3641-20 and the CO MMUNICA­TION BASE results communications failure and the COMMUNICA­TION BASE error indicator LED appears.

Error Reset

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When error occurs in the COMMUNICATION BASE, Press any
button on the COMMUNICATION BASE to reset. The 3641-20 may
freeze in communications mode. Connect the 3641-20 to the
COMMUNICATION BASE again and press the COMMUNICA TION
BASE

RECEIVE button. Although communications failure occurs in

the COMMUNICATION BASE again the 3641-20 returns to normal.
Correct the COMMUNICATION BASE error and reestablish com­munication with the 3641-20.

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Precautions

3.5 Precautions

9680 power contro l

The 3641-20 HUMIDITY LOGGER supplies power to the HUMID­ITY SENSOR while measuring humidity. However, to help con­serve battery life and provide stable measurement results, power
supply to the 9680 begins approximately 30 seconds before mea­surement starts. Further, if the recording interval is set to less than
30 seconds during recording (while the "
20 provides the 9680 with a constantpower supply. If recording is
not in progress, power is only supplied to the 9680 when the
screen display on the 3641-20 is ON. If the screen display is OFF,
no power is supplied to the 9680.

Measurement start time

The 3641-20 HUMIDITY LOGGER supplies power to the HUMID­ITY SENSOR at the recording start time, and the first measure­ment is taken approximately 30 seconds later. Therefore, the
recording start time for data recorded on the 3641-20 is approxi­mately 30 seconds after the scheduled recording start time.
For example, if you set recording to begin at 12:00 using the
scheduled start setting, recording will actually begin at 12:00:30.
However, if the 3641-20 is not in sleep mode at the time of the first
measurement (scheduled start time + 30 seconds), measurement
will begin at the scheduled start time + 32 seconds.

REC" mark is lit), the 3641-

Measurement values (during recording)

During recordi ng (while the "REC" mark is lit), t he measu rement re sult
display is not update d unti l th e next me asure ment is disp laye d. The
screen always di spl ays the mos t recen t meas ureme nt resu lt.

Measurement values (when not recording)

If you want to use the 3641-20 as a humidity monitor or to calibrate
the device, start recording or disable the power saving function.
After the HUMIDITY SENSOR is supplied with power, it takes
approximately 30 seconds before the 3641-20 displays the correct
measurement result. The 3641-20 displays the measurement
result even when recording is not taking place. However, when the
3641-20 is not recording and screen display is OFF, no power is
supplied to the HUMIDITY SENSOR, and it takes some time
before the correct measurement result is displayed once the sleep
mode is released and power is supplied to the HUMIDITY SEN­SOR.

Humidity valu es

Values displayed for humidity may be negative or exceed 100%rh.
While negative humidities and humidities exceeding 100% are
impossible in the reality, display is allowed in order to enable moni­toring of changes in humidities that are extremely high or low.

3641-20 HUMIDITY LOGGER

Specifications 4

4.1 3641-20 HUMIDITY LOGGER

These specifications apply to the 3641-20 HUMIDITY LOGGER.

Environmental & Safety Specifications

Location for use
Operate temperature

and humidity range
Storage temperature

and humidity range
Water Resilience
Effect of radiated

radio-frequency
electromagnetic field

Standards applying

Indoors. < 2000 m (6562 feet) ASL

-20 to 70°C (-4 to 158°F), 80% RH or less (no condensation)

-20 to 70°C (-4 to 158°F), 80% RH or less (no condensation)

IP54 (water resistant): Unaffected by showering test.
±10°C (50°F) at 3 V/m

Safety EN 61010 Pollution Degree 2
EMC EN 61326

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General Specifications

Internal temperature
sensor

Internal temperature
sensor response time

Recording capacity
Recording start options
Recording options
Recording stop options
Recording interval
Data backup
Measurement range

Thermistor

Approx. 25 min

8000 data X 2 channels
Manual start, Prescheduled
One time, Endless
Manual stop, Memory fulls
2/5/10/15/20/30 s, 1/2/5/10/15/20/30/60 min
Available (Dat a n ot er as ed b y w ea k batteries or batte ry re pl ac e me nt)
Temperature:

-20.0 to 70.0°C (-4 to 158°F) (Internal sensor)

-40.0 to 180.0°C (-40 to 356°F ) (External sensor*)

-40.0 to 85.0°C (The HUMIDITY SENSOR)

Humidity:

0.0 to 100.0% RH (The HUMID ITY SENSOR)
(at -40 to 85°C/-40 to 185

* External temperature sensor:

9631-01/11/21/0 2/03 /04 /14 / 24 /05 TEMPERATURE SENSOR

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°F)

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3641-20 HUMIDITY LOGGER

General Specifications

Accuracy

Temperature:

-40.0 to -0.1°C ± 1.0°C (-40 to 32

0.0 to 35.0°C ± 0.5°C (32 to 95°F ± 0.9°F),

35.1 to 70.0°C ± 1.0°C (95 to 158°F ± 1.8°F),

70.1 to 120.0°C ± 2.0°C (158 to 248°F ± 3.6°F),

120.1 to 180.0°C ± 5.0°C (248 to 356°F ± 9°F)

Humidity:9680, 9680-01/02 HUMIDITY SENSOR

*: However, only when the power save function is disabled or during re-

cording

Humidity:9680-50/51/52 HUMIDITY SENSOR

°F ± 1.8°F),

*

Interface
Input

Rated power

*

*: However, only when the power save function is disabled or during re-

cording

Infrared optical data transfer
Temperature 1 ch + Humidity 1 ch (with the HUMIDITY SENSOR )

When external temperature sensor* is in use, internal temperature
and humidity measurements are invalid.

LR03 alkaline battery 1.5 V X 2

General Specifications

Battery life

Maximum rated power
Guaranteed accuracy

period
Dimensions

Mass
Accessories

Options

Approx. three months

°C(68°F) temperature, power save function: on, interval at 1

(at 20
minute)
Approx. twenty days
(at 20°C(68°F) temperature, power save function: off)

0.1 VA
1 year

Approx. 57(W) x 74(H) x 19.5(D) mm
(2.24W" X 2.91H" X 0.77D") (excluding projections)

Approx. 70 g (2.5 oz.) (including batteries)
The HUMIDITY SENSOR

Instruction Manual
LR03 alkaline battery X 2

COMMUNICATION BASE
9680-51 HUMIDITY SENSOR
9680-52 HUMIDITY SENSOR

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3641-20 HUMIDITY LOGGER

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Temperature and Humidity Sensors

4.2 Temperature and Humidity Sensors

9680, 9680-01/02 HUMIDITY SENSOR

Operate temperature
and humidity range

Storage temperature
and humidity range

Response time
Temperature sensor

Humidity sensor
Cord length

Dimensions
Long time stability

-40 to 85°C (-40 to 356°F) (no condensation)

0.0 to 100.0%RH

-40 to 85°C (-40 to 356°F) (no condensation)

0.0 to 100.0%RH
Temperature: Approx. 100 s

Humidity: Approx. 300 s
Thermistor

Macromolecular membrane (capacity)
9680 : Approx. 1000 mm (3.28 feet)

9680-01: Approx. 5000 mm (16.25 feet)
9680-02: Approx. 10000 mm (32.50 feet)

Sensor : Approx. 30W X 13H X 8D mm

(1.18W" X 0.51H" X 0.31D")

±1%rh
(5 years at 2 5°C/77°F and 50%r h, refe rence value)

Temperature and Humidity Sensors

9680-50/51/52 HUMIDITY SENSOR

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Operate temperature
and humidity range

Storage temperature
and humidity range

Response time
Temperature sensor

Humidity sensor
Cord length

Dimensions
Long time stability

-40 to 85°C (-40 to 356°F) (no condensation)

0.0 to 100.0%RH

-40 to 85°C (-40 to 356°F) (no condensation)

0.0 to 100.0%RH
Temperature: Approx. 100 s

Humidity: Approx. 300 s
Thermistor

Macromolecular membrane (capacity)
9680-50: Approx. 1000 mm (3.28 feet)

9680-51: Approx. 5000 mm (16.25 feet)
9680-52: Approx. 10000 mm (32.50 feet)

Sensor : Approx. 30W X 13H X 8D mm

(1.18W" X 0.51H" X 0.31D")

±0.5%rh
(1 years at 25°C/77°F and 50%rh, referenc e value)

9631-01/11/21 TEMPERATURE SENSOR (molded type)

Moisture proof

Operate tempera­ture range

Storage temperature
range

Response time
Temperature sensor
Cord length

Dimensions

-40 to 180°C (-40 to 356°F) (no co nde ns at io n)

-40 to 180°C (-40 to 356°F) (no co nde ns at io n)

Approx. 100 s
Thermistor
9631-01: Approx. 1000 mm (3.28 feet)

9631-11: Approx. 5000 mm (16.2 5 feet )
9631-21: Approx. 10000 mm (32.50 feet)

Sensor: Approx. φ5 X 28 mm (0.2" X 1.1")

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Temperature and Humidity Sensors

9631-02 TEMPERATURE SENSOR (needled type)

Operate tempera­ture range

Storage temperature
range

Response time
Temperature sensor
Dimensions

-40 to 120°C (-40 to 24 8°F) (u p to 180 °C/35 6°F a t
the metal tip) (no condensation)

-40 to 120°C (-40 to 24 8°F) (u p to 180 °C/35 6°F a t
the metal tip) (no condensation)

Approx. 20 s
Thermistor
Sensor : Approx. 25 mm (0.98"),

φ1.3 mm (0.05")

Cord length: Approx. 1000 mm (3.28 feet)

9631-03 TEMPERATURE SENSOR (cease type)

Operate tempera­ture range

Storage temperature
range

Response time
Temperature sensor
Dimensions

-40 to 120°C (-40 to 24 8°F) (u p to 180 °C/35 6°F a t
the metal tip) (no condensation)

-40 to 120°C (-40 to 24 8°F) (u p to 180 °C/35 6°F a t
the metal tip) (no condensation)

Approx. 90 s
Thermistor
Sensor : Approx. 180 mm (7.09"),

φ4 mm (0.16")

Cord length: Approx. 1000 mm (3.28 feet)

Temperature and Humidity Sensors

f

9631-04/14/24 TEMPERATURE SENSOR
(rag connector terminal type)

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Operate tempera­ture range

Storage temperature
range

Response time
Temperature sensor
Cord length

Dimensions

-30 to 180°C (-22 to 356°F) (no co nde ns at io n)

-30 to 180°C (-22 to 356°F) (no co nde ns at io n)

Approx. 45 s
Thermistor
9631-04: Approx. 1000 mm (3.28 feet)

9631-14: Approx. 5000 mm (16.2 5 feet )
9631-24: Approx. 10000 mm (32.50 feet)

Sensor: Approx. 16.5 mm (0.65")

(major diameter: φ7 mm/ 0.28", minor di-

φ3.2 mm/ 0.13")

ameter:

9631-05 TEMPERATURE SENSOR (molded type)

Operate tempera­ture range

Storage temperature
range

Response time
Temperature sensor
Moisture proof
Dimensions

Response time (reference value):
Time to display 90% value change in temperature and humidity.

-40 to 180°C (-40 to 356°F) (no co nde ns at io n)

-40 to 180°C (-40 to 356°F) (no co nde ns at io n)

Approx. 100 s
Thermistor
JIS C 0920
Sensor : Approx. φ5 X 28 mm (0.2" X 1.1")

Cord length: Approx. 30 mm (1.18")

2
3
4
5
6

Moisture proo

7
8
9
10
11

24

Temperature and Humidity Sensors

Cleaning

Maintenance and Service 5

25

1

5.1 Cleaning

To clean the product, wipe it gently with a soft cloth moistened with
water or mild detergent. Never use solvents such as benzene,
alcohol, acetone, ether, ketones, thinners or gasoline, as they can
deform and discolor the case.
Wipe the LCD gently with a soft, dry cloth.

2
3
4
5
6
7
8
9
10
11

26

Repair and Servicing

5.2 Repair and Servicing

If the product seems to be malfunctioning, confirm that the sensor
cable is not open circuited before contacting your dealer or Hioki
representative.
Pack the product carefully so that it will not be damaged during
shipment, and include a detailed written description of the problem.
Hioki cannot be responsible for damage that occurs during ship­ment.

Error Messages

When an error occurs in the 3641-20, an error message will appear
as shown below.

Adjustment data error:
Adjustment data i s no lo nger ava ilable. Please s end i t for r epair.

When this occurs, repair or check the device. Contact your dealer
or Hioki representative.

Repair and Servicing

27

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2
3
4
5
6
7
8
9
10
11

28

Repair and Servicing

HIOKI

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2
3
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5
6
7
8
9
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11

HIOKI

HIOKI 3641-20 HUMI DIT Y LOGGER

Instruction Manual

Publication date: June 2008 Revised edition 6
Edited and published by HIOKI E.E. CORPORATION

Technical Support Section
All inquiries to International Sales and Marketing Department

81 Koizumi, Ueda, Nagano, 386-1192, Japan
TEL: [phone] / FAX: [phone]
E-mail: [e-mail]
URL http://www.hioki.com/

Printed in Japan 3641A981-06

• All reasonable care has been taken in the production of this
manual, but if you find any points which are unclear or in error,
please contact your supplier or the International Sales and
Marketing Department at HIOKI headquarters.

• In the interests of product development, the contents of this
manual are subject to revision without prior notice.

• The content of this manual is protected by copyright. No repro­duction, duplication or modification of the content is permitted
without the authorization of Hioki E.E. Corporation.

HEAD OFFICE

81 Koizumi, Ueda, Nagano 386-1192, Japan
TEL [phone] / FAX [phone]
E-mail: [e-mail] / URL http://www.hioki.com/

HIOKI USA CORPORATION

6 Corporate Drive, Cranbury, NJ 08512, USA
TEL [phone] / FAX [phone]

3641A981-06 08-06H

Printed on recycled paper