PT3E-0271

OPERATING INSTRUCTION MANUALFOROPTICAL INTERFEROMETIC GAS ANALYZER
MODEL FI-800

FOR USERS

Safety Precautions
1.

Read and understand the instructions in this manual before operating this instrument.

2.

Keep manual accessible at all times.

3.

This instrument cannot be used for any other purpose than what is specified in thismanual.

4.

Follow all the instructions in this manual, an deviation will compromise the safety, quality
and performance of this instrument.

5.

We accept no responsibility for an accident caused by the user not following the
instructions in this manual.

Introduction
Thank you for purchasing our optical interferometic gas analyzer Model FI-800.
This is a fixed type explosion proof (ExdⅡB + H2T4) gas analyzer to measure various gas
concentrations such as 「Hydrogen in Nitrogen」, 「Propane in air」, 「Toluene in air」, etc
and gas calorie continuously. To use FI-800 correctly, correct installation, wirings andpipings are required. Before using FI-800, confirm that the construction works have been
performed in accordance with 「Installation work manual」.
This manual is a guidebook for use of the FI-800. All persons who use this analyzer for
the first time and who has ever used the analyzer are requested to read through themanual to understand the content before use.
This manual contains the following headings to ensure the safe and effective operation.

！ DANGER
Means vital damage directly to the human life and body or properties due
to contact with high voltage, etc.

！ WARNING
Means vital damage to the human body or properties unless the operation
or measures of this manual are observed.

！ CAUTION
Means minor damage to the human body or properties unless the operation
or measures of this manual are observed.

＊

NOTE

Means advice concerning handling and operation.

1

Contents
１． Function of the product１－１ Overall view and accessories ‥‥‥‥‥‥‥‥‥‥‥‥
１－２ Name of display part and its functions ‥‥‥‥‥‥‥

3
4

２．Operation method
２ー１ Start-up method‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
２－２ Reference gas calibration‥‥‥‥‥‥‥‥‥‥‥
２－３ Gas alarm action ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
２－４ Checking of preset alarm levels‥‥‥‥‥‥‥‥‥‥
２－５ Cautional display for sensor deterioration ‥‥‥‥‥‥‥‥
２－６ Trouble indications and countermeasures ‥‥‥‥‥‥‥‥

5
6
6
7
7
8

３．Operation method in maintenance mode
３－１ Maintenance mode and summery of each menu‥‥‥‥‥‥ 9
３－２ Contrast display of interferometric sensor ‥‥‥‥‥‥‥ 10
３－３ Light amount display of interferometric sensor ‥‥‥‥‥ 10
３－４ Adjustment of 4～20mA output ‥‥‥‥‥‥‥‥‥‥‥ 11
３－５ Sensitivity (Span) adjustment of the sensor ‥‥‥‥‥‥ 11
３－６ Setting of alarm levels ‥‥‥‥‥‥‥‥‥‥‥‥‥‥
12
３－７ Alarm test‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
13
３－８ Setting of AUTO REF CAL CYCLE (Option)‥‥‥‥‥‥
14
３－９ Display of ROM number‥‥‥‥‥‥‥‥‥‥‥‥‥‥
14
３－１０ Display of specification number ‥‥‥‥‥‥‥‥‥‥
14
３－１１ Pressure/temperature display in sensor part.‥‥‥‥‥
14
４．Maintenance and inspection
４－１ Inspection frequency and items‥‥‥‥‥‥‥‥‥‥‥‥
４－２ Replacement of fuse ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
４－３ Treatment for storage or long-time shutdown‥‥‥‥‥‥
４－４ Recommendable spare parts list ‥‥‥‥‥‥‥‥‥‥‥

15
17
17
18

５．Troubleshooting ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
６．Definition of word‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥

19
20

７．Scrap of the product‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥

20

８．Product Specifications
８－１ Standard specifications ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥

21

８－２ Standard accessories‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 21
８－３ Detection principle ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
222

１．Function of the product1-1.

Overall view and accessories

Display part

Installation
hole 4-M8

Flame arrestor
for ventilation

Cable inlet(Packing type connector)＊ Quantity to be used with packing type connector, kind of packing and inner diameter ofpacking subject to customer’s application for use.
Accessory : Control key△警告“強力磁石”△WARNING:MAGNET
MODEL TC-7
RIKEN KEIKI！ WARNING
The control key used for adjustment is made from a powerful magnet.
If it is closed to a credit card, ID card, other magnet products, thiskey may damage the stored data.

31-2. Name of display part and functions① MAINTENANCE/ESC switch‥‥Used for entering into the maintenance mode with thecontrol key. [Used to cancel the maintenance mode.]② PW/TR light ‥ ‥ ……………… Illuminates continuously when the equipment isworking(power light). And flickers in the case of abnormality
in the equipment.
③ AL1 light ……………………‥‥Illuminates when 1st alarm is activating.
④ AL2 light …………………‥‥ Illuminates when 2nd alarm is activating.
⑤ R.CAL light…………………‥‥ Illuminated during reference gas calibration is performed.
⑥ RER CAL./UP switch ………… Used to perform the reference gas calibration.
[Used to increase the value.]⑦ AL/SET switch ………………… Used for confirmation of preset alarm level.
[Used for decision in the maintenance mode.]⑧ BRIGHT light …‥‥………… Illuminates when light source amount of interferometricsensor is displayed. Flickers when light source amountis decreased.
⑨ CONT light ‥‥………………

Illuminate when contrast of interferometric sensor
is displayed. Flickers when contrast is decreased.

⑩ SPAN light …‥‥……………… Flickers in the span adjustment mode. Steady lightwhen the adjustment is over.
⑪ REF. light……………………‥‥ This is not used in standard spec.(Option)⑫ REF. /DOWN switch‥‥……… This is not used in normal measurement.(Option)[Used to decrease the level]⑬ LCD ……………………………… Indicates the gas concentration and error
code.
＊ Descriptions in [ ] show actions at maintenance mode.
All switches described in the above list are operated by control key. The switch is actioned
by putting the control key onto ●mark or ▼▲mark for few seconds.
All descriptions of 「Press ○○○switch」 in this manual mean that the control key
is put onto ●mark or ▼▲mark.
4

２. Operation method
2-1. Start-up method
Before start-up FI-800, confirm that the correct pipings and wiring works are performed.
(Refer to the separate manual 「Installation work manual」 for details.)(1) Confirm that the power is not supplied to the unit

Power switch

and remove 10 hexagonal socket headed bolts
and lid. Turn ON the power switch inside the unit.
In this case, the ＬＥＤ and ＬＣＤ do not go ON
because the power is not supplied to the unit.

！

WARNING
When removing the front lid while the power is supplied, stop to supply measuring
gas and confirm that there is no combustible gases around the unit beforehand.

(2) Install the lid and 10 hexagonal socket headed bolts.
Tighten these bolts firmly and supply power to the unit.
(3) With power ON to the unit, the “PW/TR” LED light goes ON and selfdiagnostic function
starts.
(4) After the unit becomes measurement mode without abnormality in the course of selfdiagnosis,
adjust the sample flow rate.
(5) Connect pipes for sample gas to GAS IN and reference gas to REF IN respectively.
When 3-way cock etc. is installed separately, change the cock position to supply the gas.
(See 「Installation work manual」 for piping method using 3-way cock).
(6) Adjust sample flow rates of sample gas and reference gas to 300ml±25ml/min respectively
with flowmeter installed outside.
(7) Change the position of 3-way cock etc. to supply reference gas to both GAS IN and REF IN.
(8) Sample flow rate of reference gas to GAS IN shall be adjusted to the same flow rate as tosupply the sample gas.
(9) After reading gets stable (approx. 60 sec.), press REF CAL switch for about 5 seconds tomake reference gas calibration.
(10)After completion of reference gas calibration, return the cock position to supply sample gas
to the GAS IN.
After completion of steps (1) to (10), continuous measurement is started..
5

2-2. Reference gas calibration
The reference gas calibration means the adjustment method of the reading to actual
concentration (reference gas concentration) by supplying reference/substitute gas
instead of measuring gas. Generally, the gas to show 0% by volume or 0% LEL is used
as reference gas and this is the same meaning of zero adjustment. Make reference gas
calibration from time to time.
Reference gas calibration is done with following procedures.
・Supply reference gas to both GAS IN and GAS OUT by changing the position of
3-way cock etc. which is installed outside.
・Wait until the reading gets stable and check that it shows the correct
concentration(Reference gas concentration).
・If reading is different, press ▲mark of REF CAL for about 5 seconds.
・REF CAL light flickers for about 10 seconds and then, shows reference gas
concentrations.

＊

NOTE

There is a case to use the reference gas to show 100 vol.% or exception of 0%
depending on the specifications of FI-800.
Confirm relations between 「reference gas」 and 「reference gas concentration」
with 「Specifications for measuring gas」 prepared separately.
2-3. Gas alarm action
The FI-800 provides three alarm patterns such as 「H, HH alarm」, 「L, LL alarm」 and「L.H. alarm」.
Each alarm action has the 1st alarm point(AL1) and the 2nd alarm point (AL2) which
are activated when below conditions are covered.
The mark X in below table means gas concentrations.
Alarm pattern
H, HH alarm
L, LL alarm
L, H alarm

1st alarm condition
X ≧ AL1X ≦ AL1X ≦ AL1

2nd alarm condition
X ≧ AL2
X ≦ AL2X ≧AL2

When measuring gas concentration levels meet with the 1st alarm condition, relay
contact for outer alarm works and AL1 light flashes.
But measuring gas concentration levels become out of the 1st alarm condition, relay
contact for 1st alarm is reset and AL1 light turns off automatically (Self-reset).
2nd alarm provides same pattern as for 1st alarm.
Confirmation method for alarm pattern and alarm preset levels are described in chapter「3-4 Checking of preset alarm levels」

6

！ CAUTION
b-contact( Break contact) at non-exiting condition may change to open
contact
in a moment due to physical shock.
Whenever alarm signals are used with b-contact(option), please put delayed
circuit( for about one second) to receiver side of b-contact to avoid suchphenomenon.
2-4. Checking of preset alarm levels
Press ●mark of AL/SET switch by control key for more than 5 seconds. When theswitch is being pressed, 「Alarm pattern」, 「1st alarm level」 and 「2nd alarm level」are
indicated by turns in every 1 second on LCD (See below fig.).
When 1st alarm point is indicated, AL1 light is lighting, AL2 light is keep lighting
when 2nd alarm point is indicated.
When releasing the control key, they return to concentration display.
To change AL1 and AL2, please see 「3-6 Setting of alarm levels」 in maintenancemode.

Alarm pattern

Display of 1st alarm level

Display of 2nd alarm level

H.HH.

２ ５

５ ０

Every 1 second

2-5. Cautional display for sensor deterioration
When detecting sensor deterioration during selfdiagnosis or measurement, BRIGHT
light and/or CONT light flashes to show the deterioration of the sensor.
Flashing of BRIGHT light
This is a cautional indication for the decrease oflight amount. This means the decrease of lightamount for the light source of interferometricsensor. Recommend to replace or repair theinterfermetric sensor before interruption of
measurement.
7

１ ２
Flashing

Flashing CONT light
This is a cautional indication for the decreaseof contrast. This means that the interferometricsensor is being dirty. Recommend to replace orrepair it before interruption of measurement.

１ ２

Flashing

2-6. Trouble indications and countermeasures
When the abnormality is detected during
selfdiagnosis or measurement, PW/TR
light flashes and relay contact fortrouble alarm works.
In this occasion, error code number isdisplayed and outputs for 4-20mA is
fixed at 0.5mA.

Flashing

Display of error code number

Display at abnormality

Make necessary countermeasure if error code number is displayed.
Contents of error code and countermeasures
Error code
Contents and countermeasures
E-00
This means the abnormality of the system.
Replacement/repair of main PC board is required
E-01
This means the interruption of measurement due to thedeterioration of inteferometric sensor.
Flashing of BRIGHT light means the decrease of lightamount for light source remarkably and flashing CONT
light means the decrease of contrast remarkably.
In any case, replacement/repair of interferometricsensor is required.
E-02
This means the possibility of damage for setting data ofmeasuring gas or reference gas, a damage for alarm levelor sensor sensitivity data being set at maintenancemode. Re-setting for various data or replacement/repairof main PC board is required.
E-05
This means that the sample flow rate for sample gas orreference gas to be supplied from GAS IN or REF IN is
zero.
It is thought that external pump, aspirator or reducing
valve is defective or pipings are blocked.

8

３．Operation method in maintenance mode
３－１

Maintenance mode and summery of each menu.

Maintenance mode of FI-800 is to make 「 Confirmation of the status forinterferometric sensor」, 「Adjustment of 4～20mA output」 「Adjustment of sensor
sensitivity」, 「Setting of alarm levels」 etc.
Pressing ●mark of MAINTENANCE switch for above 5 seconds during measurementmode, it is entered to maintenance mode.
Pressing ●mark of MAINTENANCE switch again for above 5 seconds, it changes tothe normal measurement mode.
Once maintenance mode is entered, analog

Displays menu

Flashing

output becomes approx. 2.5mA and REF CAL
light flashes.
Also, the menu shown at right side isdisplayed on LCD display part.
You can step to each menu by pressing
UP/DOWN switch ▼/▲ and ●mark of
SET switch.

Initial screen at maintenanceThe below table shows each menu and its contents.
LCD display

Contents of menu
Display of contrast for interferometric sensor
Display of light amount for interferometric sensor
Adjustment of 4～20mA output
Adjustment of sensor sensitivity (SPAN)
Setting of alarm levels.
Alarm test
Setting of CAL cycle for AUTO REF (Option)
Display of ROM number
Display of specification number
Pressure display at sensor part
Temperature display

9

３－２.

Contrast display of interferometric sensor

Pressing the SET switch during
is displayed,
is displayed for about 1 second.
０．５ ０ ８After that, CONT and AL1 lights turns ON as shown in rightfigure and contrast of interferometric sensor measured bylight source 1 is displayed.
Contrast is an index to show a condition of dirt for interferometric sensor.
If the dirt is progressed, this level decreases. CONT light flashes during measurement
when contrast becomes below 0.35 and it becomes trouble condition when contrast
becomes below 0.30.(See 2-6 Trouble indication and countermeasures).
Progress speed of the dirt for interferometric sensor or replacement interval of theinterferometric sensor can be guessed by checking the contrast level.
When ●mark of MAINTENANCE switch is pressed, it returns to
３－3.

.

Light amount display of interferometric sensor

When pressing SET switch whileisdisplayed,
is displayed for about 1
４ ６ ２
second and then, both BRIGHT light and AL1 lightturn on, light amount for light source 1 is displayed
as show right figure.
Pressing▲▼switch,is displayed and then, light amount for lightsource 2 is displayed.
These values are indexes to show deterioration of light source.
BRIGHT light flashes during measurement if the light amount becomes below 256 andit becomes trouble condition when light amount decrease below 128.
Replacement interval of the interferometrice sensor can be guessed by checking thisvalue.
When ●mark of MAINTENANCE switch is pressed, it returns to10.

３－4. Adjustment of 4～20mA output
Pressing SET switch whileisdisplayed, 4mA test signal is output as shownright figure.
Pressing ▲▼switch, it changes to 20mA output.
When SET switch is pressed during 4mA or 20mA
test signal output, LCD flashes and signal level canbe adjusted with ▲▼switch.
Press SET switch to enter adjusted level.
Pressing ●mark of MAINTENANCE switch, it
returns to
.

Ｌ

４．０

▲▼switch

H ２０．０＊ ＮＯＴＥ
4-20mA output is adjusted before shipment. However, zero or full scalevalue may be changed slightly due to the condition of receiver side likerecorder etc.
In such case, adjust output according to this step.

３－5. Sensitivity (Span) adjustment of the sensor.
The measurement result of the gas to be supplied fromGAS IN is displayed when SET switch is pressed during
is displayed
Pressing SET switch again, LCD flashes and SPAN LED
turns on to show that the span adjustment is ready.
Supply pre-known standard gas and adjust indication
with ▲▼switch.
Press SET switch to enter the adjusted value.
Pressing ●mark of MAINTENANCE switch, it
returns to
.

２ ４．０

SET

２ ４．０
Adjust sensitivity during LCD is
flashing, enter with SET switch.

！ WARNING
Before making sensitivity adjustment, be sure to make calibration by referencegas (See step 2-2).
Calibration by reference gas is done in measurement mode.
11

３－6. Setting of alarm levels
Pressing SET switch during
is displayed, the alarm pattern of FI-800 is
displayed.
Under this condition, the 「1st alarm level」 and 「2nd alarm level」 are shown with▲▼switch.
AL1 light and AL2 light turn on for 「1st alarm level」 and 「2nd alarm level」 respectively.
Pressing SET switch during 「1st alarm level」 or 「2nd alarm level」 is displayed, LCD
flashes and it is possible to change the setting with ▲▼switch.
Pressing ●mark of MAINTENANCE switch, it returns to.
Alarm pattern display
H.HH.

▲▼Switc
1st alarm level display

２ ５

SET switch

２ ５
Change 1st alarmlevel with ▲▼switch,enter with SET switch.

▲▼Switc
2nd alarm display
５ ０

SET switch

12

５ ０

Change 2nd alarm levelwith ▲▼switch, enterwith SET switch.

３－7. Alarm test
It is possible to confirm alarm functions of this analyzer.

！ CAUTION
When make alarm(transmission) test, announce it to respective department
beforehand as this analyzer has an alarm contact. Carry it out after
making proper treatment (external signal output, alarm contact).

① Press SET switch during
is displayed.
② Select the working of alarm contact with ▼ ▲switch and enter it with SET
switch.
(Not working) ⇔(Working)③ When alarm test mode is started, test level(zero level) on LCD display flashes. If
alarm contact is set to, both CONT light and SPAN light flash.
④ It is possible to change the test level between 0～full scale or over scale bypressing ▲switch or ▼switch.
(4～20mA output level will be changed according to indication)⑤The 1st alarm will activates when test level reaches to 1st alarm level.
(After passing alarm delay time, AL1 light flashes and 1st alarm contact will work
if it is set to⑥The 2nd alarm will activates when test level reaches to 2nd alarm level.(After
passing alarm delay time, AL2 light flashes and 2nd alarm conduct will work if it is
set to.
Pressing ●mark of MAINTENANCE switch, it returns to13.

３－8. Setting of AUTO REF CAL CYCLE(Option)
Pressing SET switch during
is displayed, auto reference calibration
cycle is displayed. This is an optional function. The FI-800 which has no optional
function is set to 「 ACC.0 」.

A C C. ０

SET switch

A C C. ０

Select ０～７
with ▲▼switch
and enter withSET switch！ WARNING
It is required to make exclusive piping and wiring construction to use thefunction of auto reference calibration.
Be sure to set to 「ACC.0」 if this function is not used. If incorrect setting
is made, zero level goes down minus side and normal measurement cannot
be performed

３－9. Display of ROM number
Pressing SET switch during
is displayed, program number(our control No.) and sum level in FI-800 are shown one after the other.
This function is to confirm by field service engineer and is not importantfunction for user.
Pressing ●mark of MAINTENANCE switch, it returns to.
３－10. Display of specification number
Pressing SET switch during
is displayed, specification number(our control No.) of FI-800 is displayed.
This function is to confirm by field service engineer and is not important function
for user.
Pressing ●mark of MAINTENANCE switch, it returns to.
３－11. Pressure/temperature display in sensor part.
Pressing SET switch duringoris displayed, gaspressure (kPa, Absolute pressure) or temperature (℃) around sensor part isdisplayed.
14

４．Maintenance and inspection
This analyzer is used to operate continuously for a long time. To keep the sufficientperformance, regular inspection is required.

－ Maintenance contract －It is recommendable to make maintenance contract for regularinspection, adjustments, repairing including gas calibration tomaintain stable operation and sensitivity.
Please contact with our nearest agent for details of maintenancecontract.

４－１.

Inspection frequency and items
Following four frequent inspections are required.
* Daily inspection …… By user
* Monthly inspection …… By user
* Every 6 months/12 months …… By manufacturer or authorized
service engineer<Daily inspection>
Item

Judgement

Confirmation of“PW/TR” LED light“PW/TR” LED light is continuously ON during normal operation.
Light OFF or flashing condition means the occurrence of trouble.
Countermeasure in accordance with “Trouble shooting.”

Confirmationof indication

When minus indication or abnormal indication is displayed, checkthe reference gas value and make “Reference gas calibration.”

Confirmation ofsample flow rate to“GAS IN” and“REF IN”

Check that 300±25ml/min is supplied to both “GAS IN“ and“REF IN.” If not, adjust it to 300±25ml/min respectively.
Also check the value of other flowmeter and pressure gauge forexternal pipings.

Confirmation of“CONTRAST”LEDlight and
“BRRIGHT”LED
light

These lights are turned off in normal condition.
Flashing of these lights mean that the deterioration ofinterferometric sensor is progressing.
It is progressed further, the analyzer becomes in trouble andmeasurement cannot be done. Replace interferometric sensor
before troubling.

15

<Monthly including daily inspection>
Item

Countermeasure

Confirmation ofreference gas level

Supply reference gas from GAS IN by changing the external
3-way cock position and confirm that the reference gas level isindicated. If not, make “Reference gas calibration.”

Confirmation ofdeterioration forinterferometricsensorMake displays of contrast and light amount for interferometricsensor.
Guess the deterioration speed and replacement time bycomparing with past inspection data.

Confirmation ofalarm action

Confirm that alarm light turns on and alarm contact works bymaking alarm test.

<Every 6 months/12 months inspection>
Item
Gas sensitivity
adjustment(Calibration)

Countermeasure
After making reference gas calibration, supply the pre-known
calibration gas from GAS IN and confirm that it shows correct
indication.

Daily inspection and monthly inspection are included in 6 months/12 months
inspections.
Following inspections are also done as occasion demands.
①Cleaning②Replacement of parts③Replacement of piping materials④Confirmation of functions⑤Others！ WARNING
This analyzer may measure dangerous gases such as explosive gases &vapors continuously for a long period. To keep safety, be sure to make「6 months/12 months inspections」＊ NOTE
When make gas calibration or alarm test, announce it to respective
department beforehand.

16

４－２. Replacement of fuse

！ CAUTION
When open the lid, make it after 30 seconds from powered off as electric charge
may be accumulated in capacitor inside analyzer.

！ CAUTION
When open the lid, stop to supply measuring gas beforehand.

Fuse(1) Stop the power supply to this analyzer.
(2) Remove hexagon headed bolts(10pcs.), andopen the lid. Remove fuses from fuseholders(2 pcs) on PCB as shown right figure.
(3) Mount new fuses(2A, normal fusing).

Power switch

After confirming that the power switch is ON,
mount the lid and tighten it firmly with bolts(10 pcs.).
(4) Supply the power source and confirm that the analyzer works in normal.

４－３. Treatment for storage or long-time shutdown(1) When FI-800 is not used for a long time, remove the measuring gas (especiallysolvent gases and vapors) inside pipings by blowing the fresh air or nitrogen.
(2) Storage conditions
Temperature: -10～＋40℃

Humidity: 30～80%R.H.

Environment: Places of low temperature change.
Places where water vapor does not condense.

17

４－4. Recommendable spare parts list
No.

Description

Inspection
interval

Replacement
interval

Q’ty/set

1

Sealing packing(Non-gas contact part)

1 year

7～8 years

1 set

2

Sealing packing(Gas contact part)

1 year

2～4 years

1set

3Interferometric sensor

1 year

5～8 years

1 pce

4

Circuit board-

5～6 years

1 pce

-

7～8 years

1 pce

-

8 years

2 pcs

1 year

7～8 years

2 sets(Display)5

Circuit board(MAIN)

6

Fuse(2A)

7

Flowmeter ass’y(Including low flow sensor)＊１． The replacement interval will change depending on operating conditions and it
does not mean the guarantee period. Replacement interval may change from
inspection results.
＊２． Material of sealing packing to be used for gas contact part will change according
to the kind of measuring gas.
＊３． Replacement of printed circuit board is required due to the deterioration of
capacitors, etc.
＊４． For assembled unit and circuit board, use pre-adjusted one.
＊５． The flowmeter ass’y includes the low flow sensor.

18

５．Trouble shootingThis trouble shooting does not cover all causes of troubles. They are shown
main troubles simply to assist studying of causes.
Symptoms
・Power is
notsupplied

Causes・・・ndication
・value isnot correct

Treatment
Correct power source is ・Supply the rated AC power source
not suppliedPowerswitchinside ・Put the power switch inside analyzer
analyzer is not turned
to ON.
ON.
・Replace the fuse with rated one.
Fuse is disconnected.
Reference gas calibration ・Supply reference gas from GAS IN
and make REF CAL after reading
was done incorrectly.
gets stable.

・

Other
Gas
measuringgas,
referencegas)
contained.

(not ・ This analyzer cannot measure thenorgas correctly if other gas isiscontained.

・

Water vapor iscondensated in piping
and measuring gas ismelted in condensatedwater.

・Change the installation place of
this analyzer(including external
pipings) to warm indoor and avoid
to condensate water vapor insidepipings.
・High humidity gas which will becondensated in room temperaturelevel cannot be measured withthis analyzer.

・Measuring gas (especially・Change the installation place of thissolvent) is condensatedanalyzer(including external(liquefied) in a line of piping.
pipings) to warm indoor and avoid
to condensate water vapor insidepipings.
・High humidity gas which will becondensated in room temperaturelevel cannot be measured with thisanalyzer.

19

６. Definition of word
The definition of word to be used in this manual.
Measuring gas

Target gas to measure in sample gas

Base gas

Remaining gas excluding measuring gas in sample gas.

Reference gas

The gas to be used as the basic standard gas to measure gas
concentration.
Normally the base gas is used as reference gas.

Reference gas
calibration(REF CAL.)

Adjusting work of reading when reference gas concentration ismeasured.

The definition of word to be used in specification sheet.
Vol %This is the unit shown by percentage for how much a specificsubstances(or gas) in a volume is occupied in that volume.
ppm
This is the unit showing a volume at a part per million.
(1 vol% = 10,000ppm)% LEL
This is the unit to define the lower explosive limit of combustible
gas as 100%
mg/L
This is the unit showing a weight in 1 liter of objective gas formeasurement. The value is based on 101.3kPa at 20℃.
This is the unit of calorie and is shown as Gross Corific Value
MJ/m3
0℃. The Gross Calorific Value 0℃ is a unit of calorie commonly
Grossused in city gas companies, which shows the generating calorie
when 1m3 gas is made perfect combustion at normal
condition(0℃, 1 atm).
The gas combustion produces water vapour, but the Gross
Calorific Value applies the one adding the calorie of water
vapour (latent heat)
This is the unit of calorie and is shown as Net Corific Value 0℃.
MJ/m3
The Net Calorific Value 0℃ is a unit of calorie commonly usedNet
in city gas companies, which shows the generating calorie when
1m3 gas is made perfect combustion at normal condition (0℃,atm).
The gas combustion produces water vapour, but the Net
Calorific Value applies the one adding the calorie of water
vapour (latent heat)
Gross calorific value = Net calorific value + latent heat

７．Scrap of the productThis analyzer does not employ harmful substances(materials) for environment.
Treat it in accordance with the local regulations when scrap this analyzer.
20８．Product specifications
８－１.

Standard specifications

Model

FI-800Measuring principle

Fourier analysis, combined wave length optical interferometricmethod.

Measuring method

Sample drawing type by external sampling unit.

Response time

Within 30 sec. to get 90% of concentration (In case of 300±
25ml/min gas supply)

Analog outputs

4～20mADC(Current throw type), into 300Ω impedance max.

Concentration display

Digital LCD display

Alarm outputs

Relay contact (a-contact for each AL1 and AL2), rated 1A at
125VAC/30VDC (Resistive load).

Self-diagnostic

Low sample flow, decrease of light amount for interferometricfunctionlight source, decrease of interferometer contrast.

Power requirement

100VAC±10%～220VAC±10%, 50/60Hz, max 8VA

Operatingtemp.

& -10℃～+40℃, below 80%RH(Condensing gas inside FI-800 is

humidity

not possible)

Outer dimensions

Approx. 220(W) x 332(H) x 122(D)mm

WeightApprox 16Kg.

Structure

Flame-proof ExdⅡB+H2T4* Measuring gas and range are shown in attached 「Specifications for measuring gas」.

８－２.

Standard accessories

・Control key (1 pce.)・Specifications for measuring gas(1 sheet)・

Operating instruction manual(1 sheet)・Installation work manual(1 sheet)

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８－３.

Detection principle

The refractive index of gas mixture is determined by the kinds of composing gases
and its mixing ratio.
As long as the kinds of composing gases are known, the mixing ratio(concentration)
can be determined by measuring the refractive index.
The optical interferometric sensor applied in the FI-800 displays “Interference
fringes” on the image sensor.
The interference fringes which shifts in proportion to refractive index is reflected
onto the image sensor.
The image of interference fringes is photographed by image sensor and the amountof the movement is measured with Fourier analysis technique. And the result isconverted to the refractive index.
Concentration of several gas mixture can be displayed by adding some data like“measuring gas” and “base gas” to refractive index determined accurately.
Sensitivity of the optical interferometric sensor depends on the length of thechamber. Since the length of the chamber is physically unchanged by elapsing thetime, the high accuracy is maintained for a long time.

Prism
Plane parallel
mirrorChamber

Image sensor
LED light source

MirrorLenses

Optical Interferometric Sensor

22