51001 Digital Illuminance Meter
User’s
Manual
51001
Digital
Illuminance Meter
RG102
5th Edition
Apr. 2007
CONTENTS
Overview ...................................................................................................... 2
Prior to Use ................................................................................................... 3
Operation ...................................................................................................... 5
Illuminance Measurement .......................................................................... 11
Data Hold ............................................................................................. 12
Timer Hold ........................................................................................... 13
Range Hold .......................................................................................... 13
Deviation Display ................................................................................ 14
Data Output ................................................................................................ 16
Recorder Output (Analog Output) .............................................................. 19
Separation of Light Detector ...................................................................... 20
After-sales Servicing .................................................................................. 21
Specifications ............................................................................................. 22
Characteristics of Relative Visible-spectrum Response ............................. 23
Characteristic of Oblique Incident Light .................................................... 25
Illuminance Measurements for Lighting Installations
(Extract from JIS C 7612 standards) .......................................................... 26
Copyright Nov. 1994 (YG). 5th Edition: Apr. 2007 (KP)
-1-
Overview
Thank you very much for purchasing our Digital Illuminance Meter. Prior
to its use, thoroughly read this instruction manual to observe the correct
way of use.
Our digital illuminance meter is a small, lightweight meter and enables
illuminance measurements with the meter separated from the light detector.
The display adopts a large liquid crystal display (LCD) for ease in reading,
and attention is also paid to operation key arrangement. The photoelectric
element adopts a silicon photodiode for correcting the spectral luminous
efficiency by combining with an optical filter in order to measure the
illuminance of natural light. There is a microcomputer incorporated in this
meter to realize an illuminance meter having excellent functions. There are
also various functions incorporated in this meter, not found in conventional
meters: a data-hold function; a timer-hold function; deviation display; an
automatic power-off function; a response selection function; and others.
Refer to the text for details on these respective functions. Moreover, this
illuminance meter provides recorder output and digital data output, further
extending its usefulness. Thus, the range of applications of this meter is
much more extensive than that of existing luxmeters (illuminance meters).
This digital illuminance meter has been designed, manufactured, and
delivered under strict quality control criteria by a factory certified in the
ISO 9001 Quality Standards. We hope you will be able to make sufficient
use of the performance of this product, in addition to our traditional
photocell luxmeters.
Please retain this instruction manual for future use in operating this product.
-2-
Prior to Use
Checking accessories
After unpacking the meter, check it for appearance and its accessories.
Accessories: Instruction manual: 1
Recorder output plug (JC017A): 1
Soft-sided case (RB038A): 1
One dry cell battery (9 V) in the meter.
Precautions on Handling
· Exercise care not to drop the meter or hit it with a hard object.
· Avoid placing the meter in a room at a temperature above 60°C or below 20°C. Also, avoid placing it in an area subject to direct sunlight or at a
high humidity.
· Using the meter at low temperatures (between -10 and 0°C) causes the
display response to be delayed.
· Avoid using the meter in a dirty, dusty, or salt-air area or where there are
corrosive gases.
· Dirt or dust adhering to the light-detecting surface decreases measurement
accuracy. Wipe the surface clean with a soft, dry cloth.
· Do not use solvent (trichloroethylene, paint thinner, benzene, alcohol,
etc.), which may deform the case material or cause the print to peel off.
To remove stains from the case, gently wipe them off with a soft cloth.
If the instrument is badly stained, use a soft cloth moistened with a neutral
detergent, then wipe off the moisture using a dry cloth.
· Do not disassemble the meter.
· Do not separate mainunit from light-detector with the power on.
Safety Summary
The CAUTION Which appear on the following page must be followed to
ensure operator safety and to retain the operating condition of the
Illuminance Meter,
Safety Symbol
Indicates the operator must refer to an explanation in this manual.
-3-
Calibration
Calibrate the meter once every two years in order to maintain accurate
measurements. Calibration is done by Yokogawa. To have the meter
calibrated, consult the Yokogawa sales representative from whom you
purchased the instrument or the Yokogawa sales division listed on the
back of this manual.
Optional Accessories
Product
Light-detector extension cable
Data output cable
AC adaptor
Specification
3m
30m
3m
120 V (DC 9V)
220 V (DC 9V)
Model
910 01
910 02
910 03
940 01
940 02
Note
Accessories of non-standard
Safety standard: EN 61010-1
· AC adapter
Model: 94001(Input of 120 V± 10% AC)
Model: 94002(Input of 220 V± 10% AC)
EMC standard:
· Light-detector extension cable
Model: 91002(Cable length: Approx. 30 m)
CAUTION
Danger of electrical shock!
· When you use the AC adaptor, never use a power supply that is not suited to
the adaptor.
· Handle the AC adaptor with care so that the adapter is not damaged. If the
adaptor is damaged, do not use it.
-4-
Operation
Components
Cap
Light detector
Light-detecting surface
Main unit
Display area
∆/% key
Power switch
Range key
Hand strap
Data output connector
AC adaptor input
Figure 1. Components
-5-
Measuring reference plane indication
Recorder output
connector
Tripod-mounting screw
Eject button
Hold switch
Battery cover
Rating nameplate
-6-
Response selector
switch
Display Area
Figure 2. All Display Elements (some are unused)
Description of Elements in Display Area
Element
8,8.8.8,8.8.8
AUTO POWER OFF
∆
REC
R–H
D–H
+–
RSPS
lx
fc
%
Display condition/indication
Digital display of measured value, calculated value, and set value
Indicates meter in automatic power-off mode
Deviation
Indicates when a plug is inserted into the recorder output connector
Indicates range hold
Indicates data hold and timer hold
Indicates low battery voltage
Response setup display
Unit of illuminance
Unit of illuminance
Deviation display (%)
-7-
Prior to Operation
1. Response Time Setup
The response speed of the light detector can be selected using the response
selector switch. The response speed is set as described below. Set the
switch to FAST or SLOW according to its application. When FAST is set,
[RSPS F ] appears; when SLOW is set, [RSPS S ] appears in the display
area.
Switch position Response speed
Application
FAST
Approx. 10 mS Measurement of continuous light
Daylight, interior lighting (fluorescent
lamps, incandescent lamps), etc.
SLOW
Approx. 500 mS Measurement of average illuminance
such as flickering lights or variations
from measuring beams such as TV screens
Note: If the recorder output is used for waveform observation, set the
switch to FAST
2. Replacement of Battery
If the battery voltage drops during operation, a [ ] sign appears in the
display area. In this case, replace the battery with a new one immediately.
Check the polarity markings in the battery compartment and battery’s
polarity in order to avoid putting in the battery incorrectly. Use either a
6F22 9-V dry cell battery (S-006P, manganese, with approximately a 25hour service life) or a 6LR61 9-V dry cell battery (alkaline dry cell battery
with approximately a 40-hour service life).
Battery
Battery cover
Main unit
Figure 3. Replacement of Battery
-8-
3. Selection of Units of Measurement (lx, fc)
Since this illuminance meter conforms to the International System of Units
(SI units), the lux (lx) is regarded as the reference unit. Some countries use
the footcandle (fc) which is not an SI unit. For this reason, this illuminance
meter provides a function to display readings converted to fc units with a
unit selector switch. Select the desired unit, as needed, prior to measurement.
Be sure to turn off the power before selection.
Figure 4 shows the location of the lx-fc selector switch. Note that the
specifications and operation description in this manual are based on the lux.
Figure 4. Location of lx-fc Selector Switch
4. Automatic Power Off (AUTO POWER OFF)
This digital illuminance meter provides an automatic power-off function in
order to avoid using up the battery if you forget to turn off the power. This
function turns the power off about 30 minutes after any key is last pressed.
Immediately before turning the power off, the meter makes a beeping
sound. If you press any of the operation keys while the beeping sound is
on, this will extend the time of the automatic power-off function by 30
minutes. Whenever a plug is in the recorder output connector while the
-9-
totalized intensity of illumination and/or the comparator function is being
executed, this function is automatically disabled; thus, it does not function.
The function can be disabled permanently if not necessary (if the meter is
used continuously). Refer to the operation procedure described in “Illuminance Measurement.” Whenever this function is operable, [AUTO
POWER OFF] appears in the display area.
Notice on Making Measurements
1. Before starting measurement, as a rule, turn on the bulb five minutes
beforehand and the discharge lamp 30 minutes.
2. Set the position and angle of the light-detecting surface accurately.
Figure 5 shows the measuring reference plane.
Measuring reference plane
Figure 5. Measuring Reference Plane
3. Exercise care that your position or clothes do not affect illuminance
measurement.
4. In the case of accurate illuminance measurement, multiply the measured
value by the color correction factor corresponding to the spectral
distribution of the measuring light source and the factor corresponding to
the relative spectral response of this illuminance meter, respectively.
This meter provides a color correction factor function which is set to a
typical light source. The color correction factor multiplied by the
measured value is indicated automatically.
5. The zero point may vary if the ambient temperature varies greatly over
long-time meter use. In such a case, turn off the power once and then
turn it on again (see “Illuminance Measurement”).
- 10 -
Color correction factor*
Typical value of
Light source type
Daylight fluorescent lamp
White fluorescent lamp
Three-way fluorescent lamp
0.994
0.996
1.007
High-pressure mercury vapor lamp
0.993
High-pressure sodium vapor lamp
0.988
Standard light source B
Standard light source C
Equal-energy source (400 to 760 nm)
0.996
0.995
0.997
* The color correction factor is calculated based on the relative spectral distribution values
respectively of JIS Z 8719, JIS Z 8720, and CIE No. 53TC.2 lamps.
Table 1. Typical Values of Color Correction Factor
Note
· An electromagnetic interference affects the operating tolerances under
EN61326-1;1997+A1;1998 condition.
· If a high electromagnetic interference equipment exists in the near vicinity of
the instrument, this may cause malfunction.
Illuminance Measurement
Operation
1. Cover the light-detecting surface with the cap and confirm that the
HOLD switch lock is released.
2. Press the POWER switch to turn on the power. All the characters will
appear in the display area. When the meter enters the automatic zeroadjustment mode, [—CAL—] appears.
Note: If [—CAP—] appears, this means that the cap is not on properly.
Press on the cap until [—CAL—] appears.
- 11 -
3. When automatic zero adjustment is completed, [—CAL—] disappears
and [0.0] appears.
4. After confirming the [0.0] display, remove the cap to start measurement.
5. After the measurement has been completed, press the POWER switch
again to turn off the power, and cover the light-detecting surface with the
cap for protection against stray light.
Note: If [Err] appears, check the connection between the main unit and
light-detecting surface and check the cap to make sure it is on
properly, and then start this operation again from the beginning. To
disable the automatic power-off function, press the HOLD switch
to lock the switch before turning off the power. When automatic zero
adjustment is completed, press the HOLD switch to release the
lock. [AUTO POWER OFF] disappears, resulting in automatic
power-off being disabled.
Figure 6. Example of Display upon Illuminance Measurement
Data Hold HOLD Switch
This function holds (locks) the measured value indicated. This switch is
used when it is hard to read an indication, such as measurement in a dark
place.
Operation
1. Press the HOLD switch (lock). The measured value is held (locked)
and D–H appears.
- 12 -
2. Read the indication, taking the meter to a bright place or turning on a
light in the room.
3. To release the lock, press the HOLD switch again. This causes D–H
to disappear.
Timer Hold HOLD Switch, T–H Key
This function holds the measured value after a time set in advance has
elapsed. You must move away from the place where the meter is located so
that your position or clothes do not have an influence on the measurement.
Setting and holding the time so you may leave the area enable accurate
measurement. The data are held (locked) after five seconds have elapsed.
Operation
1. Press the HOLD switch (lock). This causes D–H to appear.
2. Press the T–H key to start the timer; D–H starts blinking.
3. Move away from the place where the meter is located.
4. When five seconds elapse, a beeping sound is generated, D–H stops
blinking, and the measured value at that time is held (locked).
5. Read the indicated value.
6. To release the lock, press the HOLD switch again. This causes
D–H to disappear.
7. To repeat this operation, do items 2 to 5 or 1 to 6.
Range Hold RANGE
Key
This key selects automatic range and manual range. Manual range enables
an arbitrarily fixed range to be set. If measured values are known to be
within a particular range response comes fast if a fixed range is used,
making reading much easier.
- 13 -
The range configuration is as follows:
0.0
to 99.9
0
to 999
0o
to 9,99o
0oo
to 99,9oo
0,ooo to 999,ooo
o: dummy display (The o or o’s indicate the number of digits)
Operation
1. Press the RANGE key to switch manual range; its range is fixed to the
currently executing range. This causes [R-H] to appear.
2. Each time this key is pressed, the range becomes maximized subsequently. After the display reaches the most significant range, it returns
to the least significant range, and repeats such action.
Note: To confirm the range, cover the light-detecting surface with the cap to
make the luminous intensity zero.
3. When the display shows the setting range, stop this key operation.
4. Keep pressing this key for two seconds to return to automatic range.
Deviation Display ∆/% Key
This key is the deviation display function. The deviation is displayed by
setting the reference luminous intensity and calculating the deviation to the
set reference value. The display is twofold:
(1) Deviation value display ∆
∆ = (measured value) - (reference value)
(2) Percent display
% = (∆/reference value) x 100
- 14 -
Operation
1. Measure the reference luminous intensity and then press the ∆/% key.
The measured value at that time is retained in memory as a reference
value. This causes [∆, R-H] to appear and the measured range is fixed.
After that, the deviation value is displayed.
2. Press the [∆/%] key again to change to the percent display. This causes
[%] to appear. Each time this key is pressed, these two appear alternately.
3. To confirm the reference value, keep pressing the CALL key.
4. To release, press the ∆/% key for two seconds.
Note: If the measured value exceeds the measuring range, [OL] appears.
- 15 -
Data Output
Digital data output and comparator output can be transferred out through
the data output connector. The output data are illuminance measurement
data, which are transmitted as BCD serial data conforming to our standard
format.
Modular jack, 6 positions
Figure 7. Connector Pin Arrangement
Illuminance meter
External power supply: 3 V
Output level
Figure 8. Connection Circuit
- 16 -
Figure 9. Timing Chart
Table 3.
Contents of Data
Bit
Output
Bit
Data
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
Start bit
Measurement data overflow
Function-setting data hold
Measurement data sign (-)
Error
Lo batt (low battery voltage)
Data length (48 bits)
Model code
(illuminance meter)
Measurement data
decimal point
H
L
L
L
L
H
H
dp1
dp2
dp3
Unused
Unused
L
L
L
L
L
Measurement data 102 8
4
2
1
The levels of L and H in bit output are fixed.
- 17 -
Bit
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
Bit
Output
Data
Measurement data 101 8
4
2
1
Measurement data 100 8
4
2
1
Unused
Measurement
data exponent
Display of unit lx
Unused
L
L
L
L
L
L
L
L
10–6
10–3
10–3
10–6
L
L
L
Note
· The application of this accessory could affect the immunity performance of
the product and such items should be used with this consideration.
· Interconnection with other apparatus is not recommended.
- 18 -
Recorder Output (Analog Output)
Recorder output is connected to observation equipment (recorder, oscilloscope, etc.), and records of illuminance variation or a light source waveform
can be observed.
Specifications: 999mV ±5% (range fixed for full scale of each range) Load
resistance of 100 kΩ or more
1. Prepare a coated single-core shielded wire and solder it to the attached
recorder output plug as shown in Figure 10. Connect another shielded
wire to the input connector of the observation equipment.
Soldered on + side
Soldered on - side
Plug cover
Shielded wire
Figure 10. Shielded Wire Connection Diagram
2. Turn on the power to the illuminance meter and insert the plug into the
recorder output connector of the light detector. The display [ REC , RH] appears, and the range is fixed (manual range).
3. Set the response selector switch to FAST.
4. The output voltage is 1 mV for one numeral of the least significant digit
of the effective display (3 digits). Confirm the range according to the
illuminance-measuring range. Use the RANGE key for range setting.
Note: Refer to “Range Hold” for RANGE key operation.
5. Cover the light detector with the cap to adjust the zero level of the
observation equipment.
6. Remove the cap from the light detector to start observation.
Note
· The application of this accessory could affect the immunity performance of
the product and such items should be used with this consideration.
· Interconnection with other apparatus is not recommended.
- 19 -
Separation of Light Detector
This illuminance meter can be used with the light detector and main unit
separated. Prepare a dedicated connection cable (an accessory sold
separately).
1. Turn off the power.
2. Press the eject button and the release lock to separate the light detector
from the main unit.
3. Insert the plug (the plug with the eject pins) of the connection cable into
the main unit and confirm that the connection is locked.
4. Connect the other end of the connection cable (the plug with the
YOKOGAWA logo) to the light detector and confirm that the detector is
locked to the connector.
5. Turn on the power to start measurement.
6. To disconnect the connection cable, press the eject buttons both on the
plug connected to the light detector and on the main unit to release the
two locks.
Eject pin
YOKOGAWA logo
Eject button
Eject button
Figure 11. Connection with Separated Light Detector
Note
· The application of this accessory could affect the immunity performance of
the product and such items should be used with this consideration.
· Interconnection with other apparatus is not recommended.
- 20 -
Use of AC Adaptor
In order to maintain correct operation, always use accessories (sold
separately).
Model: 940 01
Rating: Input of 120 V ±10% AC
Output of 9 V 100 mA DC
Model: 940 02
Rating: Input of 220 V ±10% AC
Output of 9 V 100 mA DC
Note
· The application of this accessory could affect the immunity performance of
the product and such items should be used with this consideration.
· Interconnection with other apparatus is not recommended.
After-sales Servicing
If repair work is necessary because of incorrect operation, consult the
Yokogawa sales representative from whom you purchased the instrument or
the Yokogawa sales division listed on the back of this manual.
Error Massage
When “Err.1” or “Err.2” massage is indicated on the display, repair work is
necessary.
- 21 -
Specifications
Class:
Conformance to Class A in JIS C 1609-1: 2006
Photoelectric element: Silicon photodiode
Display:
Liquid crystal display (numbers up to 7 digits); with
function and unit display provided; maximum
effective display: 999 + (0 or 0’s to indicate the
number of digit places)
Overrange [OL]
Low battery voltage [ ]
Measurement cycle: Twice per second
Measuring ranges:
0.0 to 99.9/999/9,990/99,900/999,000 lx
Automatic/manual selection of range
Accuracy:
At 23°C ±2°C
If the reading is 3000 lx or less: ±4% of reading±1
(effective minimum digit)
If the reading is greater than 3000 lx: ±6% of
reading±1 (effective minimum digit)
Response time:
Automatic range: 5 sec max.; manual range: 2 sec
max.
Characteristics of oblique incident light:
Angle of: 10° ±1.5%Deviation from the cosine law
30° ±3%
60° ±10%
80° ±30%
Characteristics of relative visible-spectrum response:
Deviation from the standard spectrum luminous
efficiency fs (JIS C 1609-1): within 9%
Temperature characteristics: ±5% at 23°C reference and a range of -10 to
40°C
Humidity characteristics:
±3%
Recorder output:
1 V ±5% (fixed range, for each range)
Load resistance: 100 kΩ or more
Automatic power-off:
Except when the integral function is working or the
recorder (data) output plug is connected. After the
last key has been pressed, the time set up for
automatic power-off can be prolonged for approximately 30 minutes. This function can be disabled.
- 22 -
Operating temperature: Between -10 and 40°C
Operating humidity: 80% R.H. or less; no moisture condensation
EMC standards:
EN55011: 1998 Group 1 Class B
EN61326-1; 1997+A1; 1998
EN61000-3-2; 1995
EN61000-3-3; 1995
Effect of radiation immunity:
Accuracy range of reading:
[Rated accuracy+10% of range] for the strength of
a radio-frequency electromagnetic field of 3V/m
Power supply:
9-V dry cell battery 6F22 (S-006P)/6LR61 or an AC
adaptor (optional)
Dimensions:
Approx. 67 (W) x 177 (H) x 38 (D) mm
Weight:
Approx. 260 g
Note
If a high electromagnetic interference equipment exists in the near vicinity of
the instrument, this may cause malfunction.
Characteristics of Relative Visible-spectrum
Response
The visible spectrum of light to which human beings are considered
sensitive has an extremely narrow range: 360 to 830 nm. Within this range,
sensitivity differs greatly depending on the wavelength. This phenomenon
is called standard spectrum luminous efficiency, indicated by V (λ). An
illuminance meter is used to measure the luminous intensity, and the
characteristics of relative visible-spectrum response plays an important role
in illuminance measurement. This meter, rather than the human eye, brings
these characteristics to the same degree of brightness as V (λ).
- 23 -
These characteristics are standardized to the engineering standards of a
legally certified luxmeter and to JIS C 1609 standards. The relative
spectrum response of an illuminance meter S (λ) is measured in 95
wavelengths at 5-nm intervals to calculate the deviation from V (λ) (fs).
This method of evaluation adopts the performance evaluation of the
Commission Internationale de l’Eclairage (International Commission on
Illumination) (CIE). Moreover, there are various light sources such as
white light, fluorescent lamps, mercury-vapor lamps, and others on the
market. The ideal would be for the relative spectrum response of the
illuminance meter and V (λ) to match absolutely; however, there is a subtle
deviation between them. Thus, a subtle indication error occurs if the
illuminance of a light source having a different spectrum distribution from
that upon calibration is measured. To correct this error, color correction
factors are provided. To make an accurate measurement, it is recommended
that color be corrected by multiplying the color correction factor of the
measuring light source by the indicated value on the illuminance meter.
Figure 12 shows the characteristics of the relative spectrum response:
Standard spectrum
luminous efficiency
Relative spectrum
response
Relative
spectrum
response
Wavelength (nm)
Figure 12. Characteristics of Relative Visible-spectrum Response
- 24 -
Characteristic of Oblique Incident Light
When reading a book at night, you will find that the brightness differs
between reading under a lamp or light and reading a little farther from the
light. At that time, you can see that the words are more legible if you turn
the book toward the light. Oblique incident light has the characteristic that
when the angle between the tangential line of an illuminated surface and the
direction of incidence is supposed to be θ, the illuminance of the surface is
proportional to cos θ. This characteristic is also standardized. If the cosine
law did not hold true, the intensity of illumination from a light source in an
oblique direction could not be measured accurately. Figure 13 shows the
characteristic of oblique incident light.
Tolerance compatible
with Class A in the
new JIS standard
Relative
illuminance
value (%)
Angle of oblique incidence (°)
Figure 13. Characteristic of Oblique Incident Light
- 25 -
Illuminance Measurements for Lighting Installations
(Extract from JIS C 7612 standards)
For general lighting, the horizontal angle of light shall be measured to
obtain an average value. Unless otherwise specified, the height of the
measuring surface shall be within 85 cm from the floor, 40 cm from the
tatami floor in the case of a Japanese-style room, or nearly on the surface of
the floor or ground in the case of a corridor or the outdoors (If it is difficult
to measure the illuminance on the floor or ground, the height shall be within
15 cm from the floor or ground).
The location for measurement shall be divided into equal areas by vertical
and horizontal partitioning lines, and the average illuminance for each area
shall be calculated. The calculated average of the areas shall be the average
illuminance of the total area measured. According to the 5-point method
given in Figure 14, the middle of each side (the m point) and the center of
gravity (the g point) shall be measured to obtain the average illuminance for
each area according to the following expression:
––
1
1
6
6
E0 = –– (Em1 + Em2 + Em3 + Em4 + 2Eg) = –– (∑Em + 2Eg)
If the variation of the illuminance is small, the illuminance may be
measured according to the 4-point method given in Figure 15 after
measuring the illuminance (Ei) of the four corners (the i point):
––
1
1
4
4
E0 = –– (Ei1 + Ei2 + Ei3 + Ei4) = –– ∑Ei
- 26 -
–
1
4
E0 = –– (∑ Em + 2Eg)
6
–
1
4
E0 = –– ∑ Ei
4
Figure 14. 5-point Method
Figure 15. 4-point Method
Also there is the method where the average illuminance of multiple divided
areas is obtained directly. For details, refer to JIS C 7612.
- 27 -
MEMO
- 28 -
Waste Electrical and Electronic Equipment (WEEE),
Directive 2002/96/EC
This Product complies with the WEEE Directive (2002/96/EC) marking requirement.
The affixed product label (see below) indicates that you must not discard this
electrical/electronic product in domestic household waste.
Product Category
With reference to the equipment types in the WEEE directive Annex 1, this product
is classified as a “Monitoring and Control instrumentation” product.
To return unwanted products within the EU area, contact your local Yokogawa
Europe B. V. office.
Do not dispose in domestic household waste.
- 29 -
Yokogawa Meters & Instruments Corporation
International Sales Dept.
Tachihi Bld. No.2, 6-1-3, Sakaecho, Tachikawa-shi,Tokyo 190-8586 Japan
Phone: 81-42-534-1413, Facsimile: 81-42-534-1426
YOKOGAWA CORPORATION OF AMERICA (U.S.A.)
Phone: 1-770-253-7000 Facsimile: 1-770-251-2088
YOKOGAWA EUROPE B. V. (THE NETHERLANDS)
Phone: 31-334-64-1611 Facsimile: 31-334-64-1610
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Phone: 65-6241-9933 Facsimile: 65-6241-2606
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Phone: 55-11-5681-2400 Facsimile: 55-11-5681-1274
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Phone: 82-2-551-0660 to -0664 Facsimile: 82-2-551-0665
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Phone: 61-2-9805-0699 Facsimile: 61-2-9888-1844
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Phone: 91-80-4158-6000 Facsimile: 91-80-2852-1441
YOKOGAWA SHANGHAI TRADING CO., LTD. (CHINA)
Phone: 86-21-6880-8107 Facsimile: 86-21-6880-4987
YOKOGAWA MIDDLE EAST E. C. (BAHRAIN)
Phone: 973-358100 Facsimile: 973-336100
LTD. YOKOGAWA ELECTRIC (RUSSIAN FEDERATION)
Phone: 7-095-737-7868 Facsimile: 7-095-737-7869
IM3E-2006.2
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