Riken Keiki SF6 Series User manual

PT3E-0220
SF6 GAS PURITY MONITOR
FI-21-SF6
Operator’s Manual
Request for the Customers
•Read and understand this manual before using the gas monitor.
•Use the gas monitor in accordance with the manual.
•Regardless of warranty period, we shall not make any compensation for accidents and
damage caused by using this product.
•Because this is a safety unit, daily maintenance, gas calibration for every six months, and
regular maintenance must be performed.
•The sensors of the gas monitor, having its sensor life, must be replaced at regular intervals.
•If any abnormality was found in the gas monitor, notify them to Riken Keiki headquarters or
authorized local representative immediately.

PT3E-0220
Introduction
Thank you for purchasing the Model FI-21-SF6. This instrument is a portable gas
monitor to measure SF6 Purity levels.
This instruction manual is a guidebook on how to operate the Model FI-21-SF6. Both
beginner users and experienced users must read this manual and understand the
contents thoroughly prior to operation.
This instrument is to be used solely for the purposes mentioned in this manual and
the attached measuring gas specifications.
For your safety, the following marks have been included in this manual.
Danger
The liability or exposure to harm or injury.
Warning
If the instrument is not operated accordingly, it may serve as a serious hazard or
health risk.
Caution
If the instrument is not operated accordingly, it may malfunction or serve as a serious
hazard.

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1
Index
1. CAUTION ON USAGE…………………………………………………………………...3
2. PARTS AND PART FUNCTIONS……………………………………………………....4
3. STANDARD ACCESSORIES……...……………………………………..……………..7
4. TUBING STRUCTURE..…….…………………..…………………………………….…8
5. MEASURING PROCEDURES.….…..……….…….…………...……………………....9
5-1. Preparations for measuring….…..………………..…………......…………………....9
5-2. Power On…………………………………………….……………..…………………...9
5-3. AIR CAL (Zero Calibration)………………………………….…………...…………..10
5-4. Apply the sample gas…………….…….……...……………………….….…………10
5-5. Start measuring……….……………………..………………………..………………10
5-6. A temporary suspension of measuring…......……………..……………………….10
5-7. Quit measuring and Power OFF....................……………………………………...10
6. DISPLAYS AND HOW TO OPERATE………………………....………….………….11
6-1. Initial Displays..………………………….…………………………………………….11
6-2. Basic display for Measuring Mode…………………..………………………………12
6-3. Setting Display (SETTING MODE)………………………………………………….13
7. MAINTENANCE……………………………………………………….………………...15
7-1. Daily check…………………………………….…………………………………..…..15
7-2. Confirming sensitivities………………………………………….……….…….…….15
7-3. Frequency / Standard for replacing parts…..………………………………...…….15
8. DISPOSAL OF THE INSTRUMENT……………..……………………………………16
9. TROUBLE SHOOTING…………………………………………………………..……..16
10. SPECIFICATIONS…………………………………………………………..……..…..17
11. MEASURING PRINCIPLE…………………………………………………………….18
12. WARRANTY………………………………………………………………..…………..19

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1. CAUTION ON USAGE
The following caution items must be followed to maintain the performance and safety
of the instrument.
¾Specification of this instrument is based on a non-explosive structure. Do not use it in
a place specified as a hazardous area.
¾Make any solutions for exhaust gas emitted from GAS OUT to avoid harmful gas from
emission (e.g. Use the instrument at well-ventilated space or outside.)
Danger
¾Use the batteries based on the specifications.
¾Replace the 4pcs batteries at the same time if battery replacement is necessary.
¾Use the specified AC adaptor if necessary.
Warning
¾Do not use this instrument close to other apparatus that generates a loud noise. It may
affect the wave form of the power source. If the AC adaptor is applied, do not use the
same power source as the other apparatus. And, use the power source based on the
specifications.
¾Do not operate the instrument in a place which has a reaction heat such as infrared
emitted from high temperatures. Also, be sure to avoid a place which has a direct
sunbeam that makes the instrument over 40ºC.
¾Interference Gas: The gases which are neither the target gas nor base gas. If there is
any interference gas in the measuring gas, the reading will be incorrect. Do not measure
gas containing interference gas.
¾Expose GAS OUT and REF. OUT to the air in order to match the pressure inside to the
atmospheric pressure.
¾Zero indication becomes unstable under rapid temperature change. Use the instrument
after fitting the instrument in ambient temperature.
¾When operating this instrument, keep it in a carrying case.
Caution

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2. PARTS AND PART FUNCTIONS
GAS IN
Inlet for the sample gas.
A specific pressure-proof tube must be connected to the inlet, and the
sample gas must be supplied through the tube. The sample gas pressure
must be 0.15～0.7MPa.
Pressure Regulator
Regulator for reducing pressure of the sample gas supplied from GAS IN.
Adjust the pressure to be 0.1±0.02MPa while “SAMPLE GAS - AIR” Switch
Cock is turned lengthways.
“SAMPLE GAS -
AIR” Switch Cock
Switch Cock for changing over the Sampling Line and the GAS OUT / AIR
IN Line.
If the Switch Cock is turned sideways (a position as indicated upper left
figure), air (Zero Gas) is supplied from GAS OUT / AIR IN to the Measuring
Unit. If the Switch Cock is turned lengthways, the sample gas is supplied
from GAS IN to the Measuring Unit.
Flow Meter A
(Sampling Line)
Flow Meter for indicating a flow rate of the Sampling Line.
Adjust the flow rate to be over 0.4L/min while “SAMPLE GAS - AIR” Switch
Cock is turning lengthways.
Flow Meter B
(Measuring Line)
Flow meter for indicating a flow rate of the Measuring Line.
Adjust the flow rate to be 0.02L/min while “SAMPLE GAS - AIR” Switch
Cock is turned sideways.
Measuring Unit Instrument for measuring SF6 gas purity. The detail information is written
in page-4.
GAS OUT / AIR IN
Outlet for emitting surplus sample gas while “SAMPLE GAS - AIR” Switch
Cock is turned lengthways.
AND,
Inlet for taking air (Zero Gas) while “SAMPLE GAS - AIR” Switch Cock is
turned sideways (a position as indicated upper left figure)
Flow Meter A Flow Meter B Pressure Regulator
“SAMPLE GAS – AIR”
Switch Cock
Measuring Unit
GAS OUT / AIR IN
GAS IN

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Measuring Unit
TOP (1) (2) (3) (4) (5) (6) (7) (8) (9)
(1) POWER key
Press this key to turn the power on until the buzzer beeps. Keep
pressing the key for approximately 3 seconds to turn the power
off.
(2) LCD display Concentration is displayed. The time, battery remainder, and
measure of gas and base gas are displayed as well.
(3) LED for “SAMPLING” The LED is on while the measuring unit is working.
(4)
MODE key
Keep pressing the MODE key for approximately 2 seconds while
the power is on, you can enter the “SETTING MODE”.
At the “SETTING MODE”, the time and the LCD contrast are
adjustable.
(CANCEL key) Contents selected by the▼▲keys are cancelled by this key.
(5)
SAVE key
Information about the Time/Date, Measuring Gas, base Gas, and
Displayed Concentration is saved by this key. The maximum
number of data points is 100.
(▼key) This key is used to adjust LCD contract or to move the cursor.
(6)
RANGE key Position of the decimal point on the concentration display can be
moved by this key.
(▲key) This key is used to adjust LCD contract or to move the cursor.
(7)
AIR CAL key When Zero adjustment is performed with Zero Gas (fresh air), this
key is used.
(ENTER key) Contents selected by the▼▲keys are fixed by this key.
(8) Buzzer Beeps when the power is turned on or off, or when special control
or incorrect operation takes place.
(9) Data Logger interface There is a data logger interface under the cover.
***Explanations in the ( ) are for use during “SETTING MODE”.

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Right side Left side
Bottom
(10) GAS IN Inlet for measuring gas.
(11) REF. OUT
Outlet connected to the reference gas chamber and the pressure
sensor. The outlet must be exposure to the fresh air at atmospheric
pressure.
(12) GAS OUT Outlet for measuring gas supplied from the GAS IN.
(13) DC6V 6VDC Interface for the specific AC adaptor.
(14) REC. A jack for 0-1VDC output. (cable: option)
(15) Battery Cover Cover for the batter box.
(16) Screw Fixing screw for the battery cover. It can be opened or closed by a
screwdriver or coin.
(10)
(12)
(11)
(14)
(13)
(15)
(16)

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3. STANDARD ACCESSORIES
The following parts are standard and optional accessories for the FI-21-SF6.
Nipple for the gas sampling point
Fix the screw-cutting side to the gas sampling point, and connect a pressure-proof tube end to
the coupler joint side.
Pressure-proof tube
Connect a pressure-proof tube end to the nipple for the gas sampling point, and connect the
opposite tube end to GAS IN on the sampling box. (Maximum pressure: 0.7MP / Length: 2m)
Alkaline battery (Size C / 4pcs)
The batteries are used to activate the FI-21-SF6.
Specific AC adaptor (Optional accessory)
The AC adaptor is optional accessory (Power Input: AC100~120V / Cable length 2ｍ)

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4. TUBING STRUCTURE
A figure shows tubing structure of FI-21-SF6.
A sequence of actions for each case that “SAMPLE GAS – AIR” Switch Cock is turned
lengthways and sideways is indicated below.
While “SAMPLE GAS – AIR” Switch Cock is turned to sideways,
¾Air (Zero Gas) is supplied from the GAS OUT / AIR IN as long as a pump inside the
Measuring Unit works. (Flow rate: 0.2 L/min.)
AIR CAL (Zero Adjustment) can be performed under this condition.
While “SAMPLE GAS – AIR” Switch Cock is turned to lengthways,
¾The sample gas is supplied from the Flow meter A to GAS OUT / AIR IN Line (Flow rate: Over
0.4L/min)
¾Pressure of the sample gas is reduced to be as low level as atmospheric pressure and the
sample gas is supplied into the Measuring Unit by the pump work. SF6 gas purity is
measured at the Measuring Unit.
***It does not matter that the Flow Meter B indicates approximately 0.3ｍL/min at the
moment.
¾The surplus sampling gas is emitted from GAS OUT/ AIR IN
Flow Meter A (Sampling Line)
Flow rate: Over 0.4L/min
Regulator
Set pressure:
0.1MPa
GAS OUT /
GAS Chamber
REF Chamber
Measuring Unit
GAS OUT
/ AIR IN
Filter
Sample gas supplied pressure:
0.15～0.7MPa
(Reduce the pressure to be less
than 0.7MPa, if it is over.)
“SAMPLE GAS -
AIR” Switch Cock GAS IN
Pump
Flow Meter B
Measuring Line
(Measuring Line)
Flow rate: 0.2L/min
Sampling Line
A
IR IN Line

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5. MEASURING PROCEDURES
5-1. Preparations for measuring
Apply the power to the instrument.
AC adaptor
Plug the specific AC adaptor in the 6VDC Interface located left
side on the sampling box.
Alkaline batteries
Take out the Measuring Unit from the sampling box, and set 4
pcs batteries (Size C) in the battery box located bottom of the
Measuring Unit.
Use a flat-blade screwdriver or a coin to open and close the
battery cover.
5-2. Power On
Make sure that the “SAMPLE GAS /
AIR” Switch Cock is turned sideways,
and then, the power is turned on by
pressing the POWER key until the
buzzer beeps.
5-3. AIR CAL (Zero Calibration)
Adjust the flow rate to be 0.2±0.04
L/min at flow meter “B” located right
on the panel, and verify that the
indication value has been stable and
press the AIR CAL key until it starts to
beep.
Screw
Picture: Left side on the
sampling box
Picture: Bottom of the
Measurin
g
Unit

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5-4. Apply the sample gas
Connect the pressure-proof tube to the
GAS IN on the sampling box and apply
the sample gas from the sampling
point. The sample gas pressure should
then be less than 0.7 MPa. Make sure
that the pressure regulator on the
panel is set 0.1±0.02MPa. Adjust the pressure regulator at 5-4 is the adjustment is necessary.
5-5. Start measuring
Turn the “SAMPLE GAS / AIR” Switch
Cock lengthways, and the measurement
is to be started. Adjust the flow rate to
be over 0.4 L/min at the Flow Meter A
located left side on the sampling box.
The higher the flow rate at the Flow
Meter A is, the sooner the flow rate
indication is to be stable. It is recommended, especially for the first measurement, to adjust the
flow rate to be 0.8L/min at the Flow Meter A since there is remaining air in the pressure-proof
tube, the pressure regulator and internal tubes.
5-6. A temporary suspension of measuring
If checking Zero condition or suspending measuring are necessary, turn the “SAMPLE GAS /
AIR” Switch Cock sideways.
5-7. Quit measuring and Power Off
1. It is necessary for the Measuring
Unit to apply fresh air before the
Power Off. Turn the “SAMPLE GAS /
AIR” Switch Cock lengthways to
apply fresh air.
Press the power key until the LCD
display goes out. (The buzzer beeps three times while pressing the power key.
2. Keep on pressing the stopper on the
retaining bar .and close the sampling
box.

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6. DISPLAYS AND HOW TO OPERATE
6-1. Initial Displays
The initial displays are automatically showed up after the power is turned on.
The self-diagnostic display is appeared firstly. If there is no serious error found in the Measuring
Unit, the setting confirmation display is then showed up for two seconds and it proceeds to the
basic display for measuring mode.
If there are some troubles found in the Measuring Unit, the
self-diagnostic display indicates the troubles by reversing the
letter colors (black and white) with beeping. It proceeds to
the basic display for measuring mode unless the troubles are
too serious to operate.
If the troubles are too serious to operate, the error display is
showed up, instead of proceeding to the basic display for
measuring mode
The following table shows all kind of error messages, error status and error shooting methods.
Error Message Error status & Error Shooting Method
ERROR : LOW BATT. The battery voltage is too low. The battery replacement is necessary.
ERROR : CONTRAST Due to the soiled interferometer, the contrast gets too low to
measure. Replacing or cleaning the interferometer is necessary.
ERROR : BRIGHTNESS The light source brightness of the interferometer is too low to
measure. Replacing or repairing interferometer is necessary.
ERROR : SETTING The setting data is somehow damaged. Repairing the Measuring
Unit is necessary.
ERROR : SYSTEM The system error is caused on the Measuring Unit. Repairing the
Measuring Unit is necessary.
ERROR : PUMP The pump is not activated normally.
Pump replacement is necessary.
12:00
ＢＡＴＴＥＲ
Ｙ
・・・ ＯＫ
ＣＯＮＴＲＡＳ
Ｔ
・・・ ＯＫ
ＢＲＩＧＨＴＮＥＳ
Ｓ
・ ＯＫ
ＪＡＮ ．３０ ２００１
12:00
ＳＥＴＴＩＮＧ ＮＯ．１
ＳＦ ６
ｉｎ ＡＩ
Ｒ
０．０
－
１００．０
％
<Self-diagnostic display> <Setting confirmation display>
12:00
ＣＯＮＴＲＡＳ
Ｔ
・・・ ＬＯ
Ｗ
ＢＲＩＧＨＴＮＥＳ
Ｓ
・ ＯＫ
ＢＡＴＴＥＲ
Ｙ
・・・ ＯＫ
ＪＡＮ ．３０ ２００１
Example: Contrast is low.
12:00
ＥＲＲＯＲ：ＳＹＳＴＥ
Ｍ

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6-2. Basic display for Measuring Mode
Saving data
To save data, press the SAVE key until the buzzer beeps.
The display shown right appears, and time, a date and a measuring
result are saved chronologically from No.001 to No.100. The saved
data can be reviewed at “VIEW SAVED DATA” in the SETTING
MODE. Also, the saved data can be deleted at “CLEAR SAVED
DATA” in the SETTING MODE.
SF6 concentration is displayed
during the measurement. If the SF6
concentration exceeds 99.9%, the
display is to be 99.9％up.
The data No. appears when the
SAVE key is pressed.
Clock (0-24 hour)
Battery life
24:00
ＳＦ６
ｉｎ ＡＩＲ
９９
．
８
%
Display contents Status
SF6 in AIR Normal measuring mode
CAUTION
CHECK AIR CAL. Zero drifting might be caused. Apply fresh air and perform AIR CAL.
CAUTION
ABNORMAL
TEMP.
The internal thermistor detects an abnormal temperature.
CAUTION
LOW BATT.
The battery voltage is too low. The battery replacement is
necessary.
CAUTION
LOW
CONTRASUT
Due to the soiled interferometer, the contrast gets too low to
measure. Replacing or cleaning the interferometer is necessary.
CAUTION
LOW
BRIGHTNESS
The light source brightness of the interferometer is too low to
measure. Replacing or repairing interferometer is necessary.
When data is saved, this
symbol appears.
When the “CAUTION ~ ” appears on the LCD, take adequate measures to deal with the
caution as soon as possible.
Caution
12:00
ｉｎ ＡＩ
Ｒ
ＳＦ６
SAVE DATA

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6-3. Setting Display (Setting Mode)
The Setting Mode is for “adjusting the time”, ”adjusting the LCD contrast ” and “reviewing the
saved data”. Enter the Setting Mode by pressing MODE key more than 2 seconds after the Power
On.
Once the Setting Mode is on, the display shown right appears.
Move the cursor (black bar) with the ▼▲ keys and select an item
by pressing ENTER key.
Items and contents
START MEAS. Move to t he Measuring Mode and start measuring
SETDATE/TIME Adjust the clock
VIEW SAVED DATA Revie w the saved data
CLEAR SAVED DATA Delete the s aved d ata
LCD CONTRAST Adju st th e LCD con trast
Move to the Measuring Mode and start measuring (START MEAS.)
This is an item to move to the Measuring Mode and start measuring
after the Setting Mode is completed. Select the “START MEAS”
with the▼▲ keys at the display shown right, and press the ENTER
key.
Adjusting the time (SET / TIME)
This is an item to adjust the internal clock. The initial position of the
cursor is YEAR. Select the number with the▼▲ keys and press
the ENTER key. The cursor then moves to DAY. Select the DAY,
MONTH, HOUR and MINUTE by following the same procedures
as YEAR. HOUR is displayed through a 24-hour clock.
Review the saved data (VIEW SAVED DATA)
This is an item to review the saved data. On the first line, the data number is shown. On the
second and third lines, the saved data and time are displayed. Select the data with the ▼▲ keys
and press the ENTER key, the saved data is then shown up. While reviewing the saved data, the
white and black letters on “SF6 in AIR” are reversed. To move to the initial display in Setting
Mode, press the CANCEL key.
ＣＬＥＡ
Ｒ
ＳＡＶＥ
Ｄ
ＤＡＴＡ
12:00
Ｖ
ＩＥ
Ｗ
Ｓ
Ａ
Ｖ
Ｅ
Ｄ
ＤＡＴＡ
ＳＥ
Ｔ
ＤＡＴＥ ／ＴＩＭＥ
ＳＴＡＲＴ ＭＥＡＳ．
12:00
ＤＡＴＥ
ＴＩＭＥ
１２：００
２００３ ／０５／１９
12:00
Ｎ
Ｏ
．００１
ＴＩＭＥ： １６：３２
▼
▲
＋
ＥＮＴＥ
Ｒ
ＤＡＴＥ：２００３／０５／１９
12:00
ｉｎ ＡＩ
Ｒ
ＮＯ．００１
ＳＦ６
９９．８ %
Initial display in Setting Mode
ENTER
Select the data No. with the ▼▲ ke
y
s
12:00
ＣＡＮＣＥ
Ｌ
ＳＴＡＲＴ ＭＥＡＳ．
Select the data No. with the ▼▲ ke
y
s

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Delete the saved data (CLEAR SAVED DATA)
This is an item to delete the saved data. Select the “CLEAR SAVED
DATA” with the▼▲ keys at the display shown right, and press the
ENTER key. To move to the initial display in Setting Mode, press the
CANCEL key.
Adjust the LCD contrast (LCD CONTRAST)
This is an item to adjust the LCD contrast. If the LCD
display is too bright or dark, adjust the contrast value with
the ▼▲ keys.
12:00
ＣＡＮＣＥ
Ｌ
ＣＬＥＡＲ ＳＡＶＥＤ ＤＡＴＡ
***Remark
Although the maximum 100 data can be saved at the Measuring Unit, individual saved
data can not be deleted separately. All saved data is deleted once the CLEAR SAVED
DATA is excuted. Note that this is not a recoverable deletion.
VALUE = 1
6
LCD CONTRAST
Display to adjust the
LCD contrast

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7. MAINTENANCE
7-1. Daily check
1). Check there are any damages on the switches, lamps, display, or body.
2). Check the battery voltage.
3). Check there are no error messages after the Power On.
4). Check the Pressure Regulator is adjustable to be 0.1±0.02MPa while “SAMPLE GAS - AIR”
Switch Cock is turned lengthways.
(5). Check the Flow Meters are adjustable to be appropriate flow rates.
7-2. Confirming sensitivities
It is recommended that the sensitivity of the Measuring Unit is confirmed periodically (at least
once annually) to ensure the correct operation. In case of any problems found or calibration
request come up, have a contact any of our agents.
7-3. Frequency / Standard for replacing parts
The frequency of the replacement parts mentioned below is simply standard. The life of the
replacement parts is dependent on how the instrument used and stored.
1). Internal Pump………………………………………………………….2 years
2). Filter….……………………..………………………………………….1 year
3). Rubber Parts in Interferometer…...……………............................4 years
4). Main PCB………………………………………………..…………….8 years
5). Interferometer Assembly………………..………………………..….8 years
6). Others (Flow Meters and Pressure regulator)….………………....8 years

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8. DISPOSAL OF THE INSTRUMENT
There is no harmful material contained in the instrument and its component parts. When the
instrument is desired to be disposed, take an appropriate disposal method based on local
regulation.
9. TROUBLE SHOOTING
The following trouble shootings do not cover all problems, however those that occur most
frequently are mentioned to help you to find the causes and the solutions.
Symptoms Causes Solutions
The Power is not turned On
No batteries or the AC
adaptor may not be
connected.
Battery polarity is wrong.
The POWER key is not
pressed long enough.
Insert batteries or connect
the AC adaptor.
Place batteries at the correct
direction.
Keep on pressing the
POWER key until the buzzer
beeps.
The reading is not correct AIR CAL. is not performed
properly.
Interference gas (All kind of
gases except the sample
gas [SF6] and the base gas
[Air]) is included in the
sample gas.
Supply the fresh air enough
to the Measuring Unit until
the indication value gets
stable, and then press the
AIR CAL key until it starts to
beep.
The sample gas that
contains interference gas
cannot be measured.

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10. SPECIFICATIONS
Measuring Unit SF6 PURITY MONITOR
Model FI-21-SF6
Measuring Principle Optical Interferometric Method
Measuring Gas SF6 (Base Gas = AIR)
Measuring Range 0 ~ 100 VOL% (Minimum Digit: 0.1 VOL％)
Accuracy ±1 VOL％
Display LCD, Digital Display
Flow rate Over 0.4 L/min
Sampling Pressure 0.15 ~ 0.7 MPa gauge
Operating Temp. & Humidity -10 ~ 40℃, Below 95 %RH
Power Source C size Alkaline Battery x 4 pcs or specified AC Adaptor (option)
Battery Life Approx. 20 hours
Dimensions Approx. 346(W) × 248(H) × 186(D) mm
Weight Approx. 5.5kg
Standard Function Pressure compensation, Temperature compensation

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11. MEASURING PRINCIPLE
The refractive index of a mixture gas is determined by the kinds of composing gases and the
mixture ratio. As long as the kinds of composing gases are known, the mixture ratio
(concentration) is determined by measuring the refractive index.
The optical interferometer applied for the FI-21-SF6 displays “Interference Stripes”, which moves
proportional to the refractive index, on the CCD. The amount of the movement is found by
performing “Fourier Analysis” to the image of “Interference Stripes” displayed on the CCD, and
then the analytical result is converted into the refractive index.
Various gas purity and gas calorific values are measured by calculating particular data such as
kinds of measuring gas, base gas and the measured refractive index. The sensitivity of the optical
interferometer depends on the length of the chamber. Since the length of the chamber is
physically unchanged, the optical interferometer is able to keep high accuracy for a long period.

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12. WARRANTY
RIKEN KEIKI CO., LTD., warrants gas alarm equipment sold by us to be free from defects in
materials, workmanship, and performance for a period of one year from date of shipment from
RIKEN KEIKI CO., LTD., Inc. Any parts found defective within that period will be repaired or
replaced, at our option, free of charge. This warranty does not apply to those items which by their
nature are subject to deterioration or consumption in normal service, and which must be cleaned,
repaired, or replaced on a routine basis.
Warranty is voided by abuse including mechanical damage, alteration, rough handling, or repair
procedures not in accordance with the operator’s manual. This warranty indicates the full extent
of our liability, and we are not responsible for removal or replacement costs, local repair costs,
transportation costs, or contingent expenses incurred without our prior approval.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES AND
REPRESENTATIONS, EXPRESSED OR IMPLIED, AND ALL OTHER OBLIGATIONS OR
LIABILITIES ON THE PART OF RIKEN KEIKI CO., LTD., INCLUDING BUT NOT LIMITED TO,
THE WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN
NO EVENT SHALL RIKEN KEIKI CO., LTD., BE LIABLE FOR INDIRECT, INCIDENTAL, OR
CONSEQUENTIAL LOSS OR DAMAGE OF ANY KIND CONNECTED WITH THE USE OF ITS
PRODUCTS OR FAILURE OF ITS PRODUCTS TO FUNCTION OR OPERATE PROPERLY.
This warranty covers instruments and parts sold to users by authorized distributors, dealers, and
representatives as appointed by RIKEN KEIKI CO., LTD.
We do not assume indemnification for any accident or damage caused by the operation of this
gas monitor, and our warranty is limited to the replacement of parts or our complete goods.