PT0E-1335

Operating Manual for
Formaldehyde Gas Detector

FP-31

2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan
Phone: +81-3-3966-1113
Fax: +81-3-3558-9110
E-Mail: intdept@rikenkeiki.co.jp
Website: https://www.rikenkeiki.co.jp/english/

Contents
1 Product Outline ................................................................................................................................................ 3
Preface ............................................................................................................................................................ 3
Purpose of use ................................................................................................................................................ 3
Definition of DANGER, WARNING, CAUTION and NOTE ............................................................................ 4
Method of confirmation for CE/UKCA marking type ....................................................................................... 4
2 Important Notice on Safety .............................................................................................................................. 5
2-1. Warning cases ......................................................................................................................................... 5
2-2. Precautions .............................................................................................................................................. 6
3 Product Components ....................................................................................................................................... 8
3-1. Main unit and standard accessories ........................................................................................................ 8
3-2. Names and functions for each part ....................................................................................................... 10
3-3. Detection TAB ........................................................................................................................................ 12
4 How to Use .................................................................................................................................................... 13
4-1. Before using the detector ...................................................................................................................... 13
4-2. Preparation for start-up ......................................................................................................................... 13
4-3. How to start the detector ....................................................................................................................... 15
4-4. Mounting of detection TAB .................................................................................................................... 18
4-5. How to detect ......................................................................................................................................... 19
4-6. Preliminary sample drawing .................................................................................................................. 24
4-7. Purge ..................................................................................................................................................... 25
4-8. Change in date and time ....................................................................................................................... 26
4-9. Power-off ............................................................................................................................................... 27
5 Self-diagnostic ............................................................................................................................................... 28
6 Maintenance .................................................................................................................................................. 29
6-1. Maintenance intervals and items ........................................................................................................... 29
6-2. How to clean .......................................................................................................................................... 30
6-3. Consumables ......................................................................................................................................... 30
7 Storage and Disposal .................................................................................................................................... 31
7-1. Procedures to store the detector or leave it for a long time .................................................................. 31
7-2. Procedures to use the detector again ................................................................................................... 31
7-3. Disposal of products .............................................................................................................................. 31
8 Troubleshooting ............................................................................................................................................. 32
9 Product Specifications ................................................................................................................................... 34
10 Appendix ...................................................................................................................................................... 35
10-1. Detection principle ............................................................................................................................... 35-2-

1 Product Outline

Preface11

Product Outline

PrefaceThank you for choosing our HCHO DETECTOR FP-31 (hereinafter referred to as the detector). Pleaseconfirm the model number of the product you purchased and how to use this manual.
This manual describes how to use the detector properly and its specifications. Not only the first-timeusers but also the users who have already used the detector must read and understand the operating
manual and use this product as described in this manual.
Note that the contents of this manual are subject to change without notice for product improvement. It
is also prohibited to copy or reproduce this manual, in whole or in part, without permission.
Regardless of warranty period, we shall not make any indemnification for accidents and damage
caused by using the detector. Make sure to read the warranty policy specified on the warranty.

Purpose of use
The detector is used with a dedicated detection TAB mounted on it to detect formaldehyde PPM leveland display the gas concentration on its display. Detection results are not intended to guarantee life orsafety in any way.

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1 Product Outline

Definition of DANGER, WARNING, CAUTION and NOTE

Definition of DANGER, WARNING, CAUTION and NOTE
Throughout this manual, the following indications are used to ensure safe and effective work.

DANGER

This message indicates that improper handling may cause serious
damage on life, health or assets.

WARNING

This message indicates that improper handling may cause serious
damage on health or assets.

CAUTION
NOTE

This message indicates that improper handling may cause minor
damage on health or assets.
This message indicates advice on handling.

Method of confirmation for CE/UKCA marking type
The CE/UKCA marking is labeled on the detector in case of comply with CE/UKCA mark. Please confirm
the instrument specification before using. Please refer Declaration of Conformity that is at the end of thismanual if you have CE/UKCA marking type.

CE/UKCA mark

CE/UKCA mark label-4-

2 Important Notice on Safety

2-1. Warning cases

22Important Notice on Safety
To maintain the performance of the detector and use it safely, observe the following instructions withWARNING and CAUTION.

WARNING If any abnormality is found in the detector, promptly contact RIKEN KEIKI.
Visit our Web site to find your nearest RIKEN KEIKI office.
Web site: https://www.rikenkeiki.co.jp/

2-1. Warning cases
WARNING Sampling point pressure
The detector is designed to draw in gases around it under the atmospheric pressure. If excessive
pressure is applied to the gas inlet and outlet (GAS IN, GAS OUT) of the detector, detected gases
may leak out from the inside and may cause dangerous conditions. Be sure that excessive
pressure is not applied to the detector during use.
 Do not modify or change the circuit, structure etc. If any modification or change is made, theperformance cannot be maintained.
 Also prevent metallic or flammable materials from entering the detector when replacing thedetection TAB, etc. If the detector is used while they are in the unit, malfunctions, electric shocks,
and fires will be caused.
Battery level check Before use, check that there remains sufficient battery power. When the detector is used for the
first time or is not used for a long period, the batteries may be exhausted. Replace them with newones before use.
 If a low battery voltage alarm is triggered, gas detection cannot be conducted. If the alarm istriggered during use, turn off the power and promptly replace the batteries in a safe area.
Others Do not throw the detector into fire.
 Do not wash the detector in a washing machine or ultrasonic cleaner.
 Do not remove the battery unit while the power is ON.

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2 Important Notice on Safety

2-2. Precautions

2-2. Precautions
CAUTION Do not use the detector in a place where it is exposed to oil, chemicals, etc. Do not submerge thedetector under water on purpose.
• Do not use in a place where the detector is exposed to liquids such as oil and chemicals.
• The gas inlet and outlet are not water-proof. Be careful not to let water such as rainwater get into
these parts. Because this may cause trouble and gas cannot be detected.
• Do not place the detector where water or dirt gets accumulated. The detector placed at such alocation may malfunction due to water or dirt that gets into the buzzer opening, gas inlet, etc.
• Note that drawing in dirty water, dust, metallic powder, etc. will significantly deteriorate thesensor sensitivities. Be careful when the detector is used in an environment where theseelements exist.
 Do not use the detector in a place where the temperature drops below -10ºC or rises over 40ºC.
• The operating temperature of the detector is -10 to +40ºC. Do not use the detector at higher
temperatures, humidities and pressures or at lower temperatures than the operating range.
• Avoid long-term use of the detector in a place where it is exposed to direct sunlight.
• Do not store the detector in a sun-heated car.
 Observe the operating restrictions to prevent condensation inside the detector.
Condensation formed inside the detector causes clogging or gas adsorption, which may disturb
accurate gas detection. In addition to the installation environment, carefully monitor thetemperature/humidity of the sampling point to prevent condensation inside the detector. Pleaseobserve the operating restrictions.
 Do not use a transceiver near the detector.
• Radio wave from a transceiver or the like near the detector may disturb the readings. If atransceiver or other radio wave transmitting device is used, it must be used in a place away fromthe detector where it disturbs nothing.
• Do not use the detector near a device that emits strong electromagnetic waves (high-frequency
or high-voltage devices).
 Verify that the pump driving indicator is rotating before using the detector.
If the flow check display is not rotating, gas detection cannot be performed properly. Check
whether the flow rate is lost.
 Never fail to perform a regular maintenance.
Never fail to perform a regular maintenance of the detector to ensure safety. Continuing to use thedetector without performing maintenance will compromise the sensitivity of the sensor, thus
resulting in inaccurate gas detection.
 Others• Pressing buttons unnecessarily may change the settings, affecting normal operation of thedetector. Operate the detector using only the procedures described in this operating manual.
• Do not drop or give shock to the detector. The accuracy of the detector may be deteriorated.
 Do not jab the buzzer opening with a sharp-pointed item. The detector may malfunction or getdamaged, allowing foreign matter, etc. to get inside.
• Do not remove the panel sheet on the display. The dust-proof performance will be deteriorated.
• Do not affix a label or the like on the infrared port. Infrared communications can no longer be
conducted.
 About battery replacement• Turn off the power of the detector before replacing the batteries.
• Replace all of the four batteries with new ones at one time.
P
tt ti t th
l iti
f th b tt i

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2 Important Notice on Safety

2-2. Precautions

CAUTION About the use of the detector• At low temperatures, the operating time is shortened due to the battery performance property.
• At a low temperature, the response of the LCD display may get slow down.
• If there is a sudden temperature change between the storage and operation locations, an errorof "TEMP. FAILURE" indicating sudden temperature changes may occur during measurement.
After confirming that the temperature of the operation location remains constant, leave thedetector under the atmosphere for 30 minutes or more before measurement.
• When cleaning the detector, do not splash water over it or use organic solvents such as alcoholand benzene on it. The surface of the detector may be discolored or damaged.
• If the detector is not used for a long time, turn on the power at least once every six months andcheck that the pump draws in air (about three minutes). The detector, when not activated for along time, may cease to work because of hardening of the grease in the pump motor.
• If the detector is not used for a long time, store it after removing the dry batteries. Battery leaks
may result in fire, injury, etc.
• When the detector is used again after a long-period storage, never fail to perform a calibration.
Contact RIKEN KEIKI for information on readjustment including calibration.

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3 Product Components

3-1. Main unit and standard accessories

3
3

Product Components

3-1. Main unit and standard accessories
After opening the carton box, check the detector and accessories.
If there is anything missing, contact RIKEN KEIKI.

Main unit
For names and functions of individual parts of the detector and LCD display, see "3-2. Names and functionsof individual parts" on page 10.
FP-31 main unit

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3 Product Components

3-1. Main unit and standard accessories

Standard accessories

Detection TAB
20 pcs/bag

AA alkaline drybatteries
4 pcs

Tripodmounting
attachment

Product warranty
Operating manual

Optional parts• Filter• Software for data logger-9-

3 Product Components

3-2. Names and functions for each part3-2. Names and functions for each part
This section describes the names and functions of the individual parts and LCD display that make up thedetector.

Main unit
(1)

(2)

(3)

(4)
(10)
(5)

(9)
(12)

(6)

(8)
(7)
(11)

Name
GAS OUTGAS IN
Detection TAB cover
LCD display
 button button
Infrared communication(7)port(8) ON/OFF/START button(9) DATA button(10) Buzzer sound opening(11) Lock plate(12) Battery cover
(1)
(2)
(3)
(4)
(5)
(6)

Major function
Exhausts the gas drawn into the detector. (Do not block it.)Draws gases into the detector. (Do not block it.)Raised when the detection TAB is mounted.
Displays the gas concentration and so on.
It is used to increase numerical values.
It is used to decrease numerical values.
Used to carry out data communications with a PC in data loggermode.
It is used to turn on or off the power or start detection.
It is used to set the past detection data and current date and time.
Emits operation and judgment sounds. (Do not block it.)
Retains the battery cover.
Protects the battery.

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3 Product Components

3-2. Names and functions for each part

Display
(4)
(5)
(1)

(6)

(2)

(3)

Name
(1) Gas name and message display(2)

Gas concentration/Count/Clockdisplay(3) Value/unit display(4) Operating state display(5) Battery level icon
(6) Flow check display

Major function
Displays type of measured gas and message.
Displays the gas concentration as numeric output. Displays
remaining measurement time in seconds. Displays thecurrent time.
Displays the unit of a numerical value.
Displays the operating status in the detection mode. Normal:
Blinking
Displays the approximate battery level.
Displays the drawing status. Normal: Rotating- 11 -

3 Product Components

3-3. Detection TAB

3-3. Detection TAB
The detection TAB is a gas detection unit developed by RIKEN KEIKI. It contains special paper that exhibits
a color by contact with gas in a case that uses polypropylene as a material.

Handling of detection TAB
A special reagent is applied to the test paper part of the detection TAB. Be careful not to touch the test paperwith fingers or an object when handling the detection TAB.

Detection TAB No., gas name, etc.

Case (black)
Test paper (white)

CAUTION Do not touch the test paper of the detection TAB. Touching it may impair the detection function.
If you touch the test paper, rinse your fingers thoroughly to remove the chemical reagents used on
the test paper. These reagents have no direct influence on human body.
 Do not use used detection TABs. The detection TAB can be used for single gas detection. Even if
the detection result shows 0 ppm, the second detection with the same detection TAB will not
produce an accurate result.

Storage of detection TAB
Fully understand precautions for detection TAB storage before storing them.
Storing improperly the detection TAB may impair its performance, resulting in inaccurate gas detection.
The proper storage location of each detection TAB depends on the type. Store the detection TAB in thestorage location indicated on a packing box.

CAUTION
 Store pieces of detection TAB in a packing box in the storage location indicated on the bag.
 Do not store the detection TAB of which packing box was once opened again. If a detection TAB
that was once taken out of the packing box is stored or left in the atmosphere or on the detector, it
will discolor and can no longer maintain its original performance.
 Use up the detection TAB before the end of the storage period on the packing box.
The detection TAB of which storage period has elapsed will become deteriorated and can nolonger maintain its original performance.

- 12 -

4 How to Use

4-1. Before using the detector

44How to Use

4-1. Before using the detector
Not only the first-time users but also the users who have already used the detector must follow theoperating precautions.
Ignoring the precautions may damage the detector, resulting in inaccurate gas detection.

4-2. Preparation for start-up
Check the following points before starting gas detection.
• The battery level is sufficient.
• The filter in the detector is not contaminated or clogged.
• The display or other parts are not damaged.

Attaching batteries
When the detector is used for the first time, or when the battery level is low, install or replace with the new
AA alkaline dry batteries according to the following procedure.

CAUTIONTurn off the power of the detector before replacing the batteries.
Perform battery replacement in a non-hazardous area where no explosive gases exist.
Replace all of the four batteries with new ones at one time.
Pay attention to the polarities of the batteries when installing them.
Completely lock the battery cover after installing the batteries. If the battery cover is not completely
locked, the dry batteries may drop off.
 Do not use rechargeable batteries that may interrupt a measurement due to the discharge
characteristic of rechargeable batteries.

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4 How to Use

14-2. Preparation for start-up

Check that the power of themain unit is turned off.
If the power is turned on, press the
ON/OFF/START button to turn it off.

2

Unlock the battery cover bypulling the lock plate open
and open the battery cover.

3

Paying attention to thepolarities of the batteries,
install new batteries.
Remove any old batteries from the
case.

4

Close the battery cover andthen close the lock plate.
Close the lock plate tightly until itclicks.

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4 How to Use

4-3. How to start the detector

4-3. How to start the detector
When the power is turned on, a self-diagnostic starts, and then the detector enters the waiting condition.

Power-onPress and hold the ON/OFF/START button (one second or longer) until the buzzer blips to turn on the power.

NOTE When the button is pressed, the buzzer emits a blip to indicate an effective operation but does not if
the operation is ineffective or the processing overflows.

Basic operating procedures
When the power is turned on, the LCD display changes automatically as shown below, and the detector
enters the waiting condition.

<When No Detection TAB is Mounted>
1

Press and hold the
ON/OFF/START button for one
second or longer.
After all LCD displays light up, thedate and time is displayed.

The capacity of the batteries isdisplayed for about five seconds.

The message of "STAND BY" isdisplayed for about five seconds.

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4 How to Use

2

Mount the detection TAB on
the detector.

3

Select a detection TAB using
the  or  button.

4-3. How to start the detector<When Detection TAB is Mounted>
1

Press and hold the
ON/OFF/START button for one
second or longer.
After all LCD displays light up, thedate and time is displayed.

The capacity of the batteries isdisplayed for about five seconds.

The message of "SELF CHECK" isdisplayed for about five seconds.

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4 How to Use

4-3. How to start the detector

The message of "STAND BY" isdisplayed for about five seconds.

2

Select a detection TAB using
the  or  button.

CAUTION Do not dismount the detection TAB during self-diagnostic.
Dismounting of the detection TAB during self-diagnostic will disturb accurate self-diagnostic, andthe message of "FAIL" is displayed on the display.

NOTE When the power is turned on with a detection TAB mounted, self-diagnostic will start to check the
optical sensor. Perform a sensor check as needed.
 Use a new detection TAB for self-diagnostic, if possible. If a severely deteriorated detection TAB suchas a detection TAB that is once used or left for a long time after opening the bag is used, this may
impair correct sensor check, and the message of "FAIL" may be displayed.

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4 How to Use

4-4. Mounting of detection TAB

4-4. Mounting of detection TAB
The mounting of detection TAB is required to perform gas detection using the detector.
For handling of detection TAB, see "3-3. Detection TAB" on page 12.

1

Pull up the detection TAB
cover to open.

2

Set the detection TAB on themounting opening.
Pay attention to the front and back of
the detection TAB when mounting it.

3

Close the detection TAB coverand push the center partfirmly with fingers.

CAUTION After placing the detection TAB on the mounting opening, close the detection TAB cover gently.
Closing the cover quickly may cause a malfunction.
 Close the detection TAB cover gently to prevent fingers from being pinched.
Be careful not to release the fingers holding the cover suddenly. This may cause damage to thecover or an unexpected injury.
 Be careful not to enter water drops, dust, etc. from the mounting opening when mounting thedetection TAB.
 Mount the detection TAB on the detector immediately after the bag is opened and start gas
detection to maintain the original performance of the detector. After the bag is opened, thedetection TAB is affected by the gas to be detected, other interference gases which react withother reagents to give a color and dust.
 Mount the detection TAB correctly. If the detection TAB is incorrectly mounted on the detector, thedetector cannot deliver its original performance.
 Check that the number of the detection TAB mounted on the detector agrees with the number
selected on the detector before starting detection. If the two numbers are not the same, thedetector cannot deliver its original performance due to the difference in measurement time.

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4 How to Use

4-5. How to detect

4-5. How to detect
Gas concentration detection starts from the Waiting Condition. Once gas concentration detection is started,the detector draws in gas to be detected for a certain period of time and then displays the gas concentration.

Gas concentration detection
Perform gas concentration detection following the procedure below.

1

Mount the detection TAB in
the waiting condition.
See "4-4. Mounting of detection TAB"on page 18.

2

Select a detection TAB using
the  or  button.

3

Press the ON/OFF/START
button.

The countdown of detection time(second) is displayed.

After the countdown is completed,the detected concentration isdisplayed.

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4 How to Use

4-5. How to detect

The number stored in the memory isdisplayed.

After completion of the detection, amessage indicating the completionof detection and a concentration arealternately displayed.

4

Dismount the detection TAB.

NOTE Only one type of detection TAB is used with the detector, but there are two types of measurement
ranges available. Select a TAB No. according to the measurement range.
Measurement range 0 to 0.4 ppm, Measurement time 1800 seconds (30 minutes): TAB No. 008
Measurement range 0 to 1 ppm, Measurement time 900 seconds (15 minutes): TAB No. 009

DANGER The gas drawn in may be oxygen-deficient or toxic gas. Never inhale the gas exhausted from thegas outlet.
If the gas drawn in may be oxygen-deficient or toxic gas, discharge it to a place that is deemed
safe.

CAUTION Do not block the gas inlet and outlet during gas concentration detection. This prevents accurate
detection.
 If the temperature changes by 5ºC or more during gas concentration detection, the protection
function is triggered, automatically stopping the detection.
 Do not dismount the detection TAB during gas concentration detection. If the detection TAB is
dismounted, the detection will be interrupted. After the message of "TAB REPLACE" is displayed,
mount a new detection TAB and retry detection.
 Never fail to use a new detection TAB for gas detection. If a detection TAB that is once used or left
for a long time after opening the bag is used, this may impair accurate detection, and the messageof "TAB FAILURE" may be displayed. Even if the "TAB FAILURE" message is not displayed, thedetection result is not accurate.
The use of a detection TAB that is new but affected by gases in the atmosphere may affect theperformance of the detector.
 Do not use used detection TAB. The detection TAB can be used for single gas detection. Even if
the detection result shows less than 0.01 ppm, the second detection with the same detection TAB
will not produce an accurate result.

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4 How to Use

4-5. How to detect

CAUTION If the detection place is changed, for example after detecting a high concentration gas, the gas
remaining in the detector may influence the next detection. In such cases, perform preliminary
sample drawing or purge to discharge the remaining gas from the detector. See "4-6. Preliminary
sample drawing" on page 24 and "4-7. Purge" on page 25.
 Do not let the detector draw in water or oil. The internal pump or sensor may become inoperative.
 Check the drawing operation of the pump before detection.
This can be checked by the operating noise of the pump or the drawing condition of the pump's
inlet. The detection is disabled while the pump is stopped.

NOTE The drawing time varies depending on the type of detection TAB.
 When the detection result is less than 0.015 ppm, the detector displays "<0.01" on it.

High concentration gas detection
If the detection of a high concentration gas is performed after a new detection TAB is mounted, the highconcentration gas accumulated reacts with the detection TAB, and then the detector starts gas detection
automatically. In this case, the previously selected measurement range is used for the gas detection.

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4 How to Use

4-5. How to detect

Check of detection results
The past detection results can be displayed in the detection standby or detection completion state.
Up to 99 of detection results can be stored in the memory. The measurement results are maintained evenafter the detector is turned off.

1

Press the DATA button in thedetection standby or detection
completion state.
The last detection result is
displayed.

If gas detection is never done or thedetection results are deleted, theright message is displayed.

If the number of detection results
exceeds 99, the right message isdisplayed.
Delete the detection results to store
a new one. See the next section"Deletion of detection results" onpage 23.

2

Select a past detection result
using the  or  button.

3

Press the DATA button.
The detector returns to thedetection standby or detection
completion state.
If no button operation is done on thedetector for 20 seconds or longer,
the display will automatically return
to waiting condition or the gas
concentration display in thedetection completion state.

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4 How to Use

4-5. How to detect

Deletion of detection results
All of the past detection results can be deleted while being checked.

1

During the check of detection
results,press the ON/OFF/START and
DATA buttons at the sametime.
A confirmation message for thedeletion of detection results is
displayed.

2

Press the ON/OFF/START
button.
All detection results will be deleted.
To cancel the deletion, press the
DATA button after the step 1.

NOTE

 The detection results cannot be deleted one by one.
 The deletion operation deletes all detection results at once. Perform this operation with extreme carebecause the detection results that were once deleted cannot be recovered.

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4 How to Use

4-6. Preliminary sample drawing

4-6. Preliminary sample drawing
After the detection of a high concentration gas or similar cases, the gas remaining in the detector may
influence the next detection. Perform preliminary sample drawing to discharge remaining gas completelyfrom the detector.

1

Dismount the detection TAB.

2

Press the ON/OFF/START
button.
Preliminary sample drawing is
performed for about five seconds.

CAUTION Preliminary sample drawing must be performed under a fresh atmosphere.

NOTE Perform preliminary sample drawing as needed.

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4 How to Use

4-7. Purge

4-7. Purge
When gas detection is continuously conducted, the gas adsorbed in the tubing may prevent accurate gas
detection (readings become slightly higher than the actual concentration). Never fail to purge the gases
adsorbed in the tubing with atmospheric air (no gas to be detected is contained) before starting gas detection.

1

Mount a used detection TAB.

2

Select purge using the  or
 button.

3

Press the ON/OFF/START
button.

Purge starts, and the countdown of
600 seconds (ten minutes) is
displayed.
After a lapse of 600 seconds (tenminutes), purge will automaticallyend.

4Dismount the detection TAB.

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4 How to Use

4-8. Change in date and time

4-8. Change in date and time
The date and time of the internal clock can be changed. Set year -> month -> day -> hour -> minute in this order.

1

Press and hold the DATA
button on the screen for TAB
selection for three seconds orlonger.

After the memory screen isdisplayed, the date and time aredisplayed.

2

Press the  and DATA
buttons at the same time.
The year display blinks.
•Using the  or  button, thenumbers displayed can bechanged.

3

After setting the year, press
the ON/OFF/START button.
The month display blinks.
•Using the  or  button, thenumbers displayed can bechanged.
•Continue to make the settings of day,hour and minute in a similar
procedure; Press the
ON/OFF/START button to move tothe next setting.
•Press the DATA button to return
the previous setting, e.g. month ->year.

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4 How to Use

44-9. Power-off

After setting the minute, press
the ON/OFF/START button.
"END" is displayed, and then thedate and time that have just been set
are displayed.

5

Press the DATA button.
The screen will return to the TAB No.
SELECT screen.

NOTE If the detector mistakenly enters another mode, turn off the power and try again.
 In the event of a failure of the internal clock, promptly contact RIKEN KEIKI.

4-9. Power-off
Press and hold the ON/OFF/START button (three seconds or longer) until the buzzer sounds nine blips toturn off the power.

NOTE To turn off the power, keep the button pressed until the display disappears.
 If no operation is done on the detector five minutes or longer after power-on or the completion of
measurement, the power will be automatically turned off.

CAUTION When the detector is contaminated, clean it with a dustcloth, etc. after wetting it in water andwringing it out well.
 When cleaning the detector, do not use organic solvents such as alcohol and benzene on it.

- 27 -

5 Self-diagnostic

5
5

Self-diagnostic

The detector has the types of self-diagnostic functions shown in the table below.
Each alarm is notified by buzzer and display.

<Self-Diagnostic Type and Alarm Pattern>
Symptoms
At power-on
Battery voltage low
Detector system error
Sensor failure
During detection
Advance notice of battery
voltage low
Battery voltage low
Poor pump connection
Dismounting of detection
TAB

BuzzerContinuous
None
Continuous
None
Continuous
Continuous
None

Defective detection TAB

Continuous

Abnormal temperatureContinuous- 28 -

Display
CHANGE BATTERYSYSTEM ERROR
FAIL
Indicated by battery icon
CHANGE BATTERY
PUMP FAILURETAB REPLACETAB FAILURE↓↑REMOVE TAB
TEMP. FAILURE

6 Maintenance

6-1. Maintenance intervals and items

6
6

MaintenanceThe detector is an important instrument for the purpose of safety.
To maintain the performance of the detector and improve the reliability of safety, perform a regular
maintenance.

6-1. Maintenance intervals and items
This is a safety unit. Never fail to perform daily and regular maintenance before use.
• Daily maintenance: Perform maintenance before commencing each work.
• Regular maintenance: Perform maintenance at least once a year to maintain the performance as a safety
unit.
Maintenance
item
Battery level
FilterOperation of
main unit
Concentration
display

Maintenance content
Check that the battery level is sufficient.
Check that the filter is not contaminated.
Check the LCD display for a fault indication.
Make the detector draw in fresh air and check thatthe concentration display value is zero. When thevalue is other than zero, perform zero calibration
after ensuring that no other gases exist around thedetector.

Daily
maintenance○○Regularmaintenance
○
○

○

○

○

○

WARNING If an abnormality is found in the detector, contact RIKEN KEIKI immediately.

NOTE The built-in sensor of the detector has a validity period and must be replaced regularly.

- 29 -

6 Maintenance

6-2. How to clean

6-2. How to clean
Clean the detector if it becomes extremely dirty. The detector must be turned off while cleaning it. Use a
waste cloth or the like to remove dust. Do not use water or organic solvent for cleaning because they may
cause malfunctions.

CAUTION When cleaning the detector, do not splash water over it or use organic solvents such as alcoholand benzene on it. Otherwise, it may cause discoloration or damage to the surface of the detector
or a sensor failure.

6-3. Consumables
Consumables used for the detector include regular replacement parts and batteries. Replace theconsumables at recommended maintenance intervals.

<List of Recommended Regular Replacement Parts>
Recommended
Recommended
Quantity
maintenancereplacement
Remarks(pieces per unit)
intervalinterval
1
Pump unit
6 months
1 - 2 years
1
RP-12*
2
Filter6 months
6 months - 1 year
1*
3
Alkaline dry battery
4－－* The operation must be checked after replacement by a qualified service engineer. For the stable operationof the detector and safety, ask a qualified service engineer to take care of replacement of the parts.
Request RIKEN KEIKI for operation check.
Name

NOTE

 The above replacement intervals are recommendation only. The intervals may change depending on
the operating conditions. These intervals do not mean the warranty periods either. The result of theregular maintenance may determine when to replace the parts.

<Battery Replacement>
For battery replacement procedure, see "4-2. Preparation for start-up" on page 13.

- 30 -

7 Storage and Disposal

7-1. Procedures to store the detector or leave it for a long time

7
7

Storage and Disposal

7-1. Procedures to store the detector or leave it for along time
The detector must be stored under the following environmental conditions.
• In a dark place under the normal temperature and humidity away from direct sunlight• In a place where gases, solvents or vapors, etc. are not present
Store the detector in a shipping carton, if any, in which the product was delivered.
Store the detector away from dust, etc. if the shipping carton is not available.

CAUTION If the detector is not used for a long time, store it after removing the batteries. Battery leaks may
result in fire, injury, etc.
 If the detector is not used for a long time, turn on the power at least once every six months andcheck that the pump draws in air (about three minutes). The detector, when not activated for a longtime, may cease to work because of hardening of the grease in the pump motor.

7-2. Procedures to use the detector again
When the detector is used again after a long-period storage, perform a calibration.

CAUTION
 Contact RIKEN KEIKI for information on readjustment including calibration.

7-3. Disposal of products
When the detector is disposed of, it must be treated properly as an industrial waste (noncombustibles) inaccordance with the local regulations, etc.

WARNING Dispose of batteries in accordance with a procedure specified by the local authority.

- 31 -

8 Troubleshooting

8
8Troubleshooting

The Troubleshooting does not explain the causes of all the malfunctions which occur on the detector. This
simply helps to find the causes of malfunctions which frequently occur.
If the detector shows a symptom which is not explained in this manual, or still has malfunctions even though
remedial actions are taken, please contact RIKEN KEIKI.
Symptoms(Message)

CausesActions

Battery voltage low(CHANGE BATTERY)

The battery voltage is getting
low.

Replace all the four batteries with new ones.
See "4-2. Preparation for start-up" on page
13.

Sensor failure(FAIL)

Poor pump connection(PUMP FAILURE)
Detector system error(SYSTEM ERROR)
Dismounting ofdetection TAB(TAB REPLACE)
Defective detection TAB(TAB FAILURE)↓↑(REMOVE TAB)
Abnormal temperature(TEMP. FAILURE)

An excessive shock wasgiven to the detector, e.g.
falling or hitting against
something, or the detector
was used for a long time.
The detection TAB was
dismounted during sensor
check (self-diagnostic).
An excessive shock wasgiven to the detector, e.g.
falling or hitting against
something, or the detector
was used for a long time.
The detector was affected by
too much noise.
The detection TAB was
dismounted during gas
detection.
The initial condition of thedetection TAB is not normal.
The ambient temperature of
the main unit changed
rapidly.
The power is not turned on.
The battery level is too low.

The power cannot be
turned on.

The ON/OFF/START button
was released quickly.
The polarities of thebatteries are wrong.

- 32 -

After cycling the power, perform a sensor
check (self-diagnostic). If the symptom
persists, consult RIKEN KEIKI.
After mounting the detection TAB andcycling the power, retry the sensor check(self-diagnostic).
After cycling the power, perform a sensor
check (self-diagnostic). If the symptom
persists, consult RIKEN KEIKI.
Cycle the power. If the symptom persists,
consult RIKEN KEIKI.
Mount the detection TAB and thendismount it after completion of the gas
detection.
Replace the detection TAB with a new one.
See "4-4. Mounting of detection TAB" onpage 18.
After confirming that the atmospherictemperature remains constant, leave thedetector under the atmosphere for 30
minutes or more before measurement.
Replace all the four batteries with new ones.
See "4-2. Preparation for start-up" on page
13.
To turn on the power, press and hold the
ON/OFF/START button until a beep isheard.
Check that the batteries are properly
installed in the main unit. See "4-2.
Preparation for start-up" on page 13.

8 Troubleshooting
Symptoms(Message)

CausesActions

The pump does notwork.

The capacity of the batteries
used is getting low.

After replacing all the four batteries withnew ones, cycle the power. See "4-2.
Preparation for start-up" on page 13.

Gas cannot be drawn
in.

The sampling hose is
disconnected, or the tubing
is clogged.

Check the sampling hose and tubing forconnections, clogging, etc.

- 33 -

9 Product Specifications

9
9

Product Specifications

Model
Gas to be detected
Detection Principle
Measurement range
Measurement time
Fault alarm
Self-diagnosis
Detection method
Display method
Memory function
Use
temperature/humidity
range
Power supply
Continuous
operating time
Outer dimensions
WeightFunctions

FP-31
Formaldehyde (HCHO)
Photoelectric photometry method
TAB 008: 0.000 - 0.400 ppm ("<0.01" is displayed for less than 0.015 ppm.)
TAB 009: 0.00 - 1.00 ppm ("<0.02" is displayed for less than 0.02 ppm.)
TAB 008: 1800 seconds (30 minutes)
TAB 009: 900 seconds (15 minutes)
Battery voltage low, Sensor failure, Poor pump connection, Detector systemerror, Abnormal temperature
Pump drawing type/Time accumulations measurement
LCD digital display
Up to 99 detection points (Automatic recording after detection)
Operating temperature range: -10 - +40ºC
Operating humidity range: 90%RH or less (Non-condensing)*The operating temperature and humidity ranges of each detection TAB are
indicated on the detection TAB itself.
AA alkaline dry battery x 4
About 12 hours (new dry batteries, without alarms or lighting, at 20ºC)
Approx. 80 (W) x 150 (H) x 40 (D) mm (Only main unit excluding projections)
About 250 g (without dry batteries)
Data logger function, Clock function- 34 -

10 Appendix

10-1. Detection principle

10
10

Appendix10-1. Detection principle
By introducing gas to the detection TAB, the special test paper impregnated with color former that has been
incorporated into the detection TAB exhibits a color by a chemical reaction.
For example, if formaldehyde (HCHO) contacts with the test paper of the detection TAB, a compound isformed by a chemical reaction of the color former contained in the paper and HCHO, changing the paper
color from white to yellow.
The degree of the color forming is recognized as change in the amount of reflection light. The change ratioof this reflection light intensity is called a response value to a gas concentration. With a standard curve
obtained in advance, a concentration can be determined from a response value of the gas to be detected.
Detection TAB

Light source (LED)GAS INGAS OUT
Gas chamberLight receiver (Photodiode)- 35 -