Sibata MT-05U User manual

CODE 090200-081
Thank you very much for purchasing our product.
● This operation manual contains important safety information and product handling instructions.
● Before use, read through this operation manual to ensure safe and proper use.
● After reading through this operation manual, keep it in a safe place for future reference.
OPERATION MANUAL (for Main Unit)

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Table of Contents
1Before use ......................................................................................................................... 3
1-1 About the operation manual................................................................................................ 3
1-2 About the package contents ............................................................................................... 3
1-3 Limited warranty ................................................................................................................. 4
2Important safety information ........................................................................................... 5
2-1 User (Important).................................................................................................................. 5
2-2 Graphical symbols .............................................................................................................. 5
2-3 Caution labels..................................................................................................................... 7
3About this product............................................................................................................ 8
3-1 Overview............................................................................................................................. 8
3-2 Features.............................................................................................................................. 8
3-3 Principle of measurement................................................................................................... 9
3-4 Measurement modes........................................................................................................ 12
3-5 Precautions....................................................................................................................... 13
3-6 Names of parts and components ..................................................................................... 15
4Set-up............................................................................................................................... 16
4-1 Supplying the power ......................................................................................................... 16
4-2 Turning ON the power switch ........................................................................................... 16
4-3 Main Menu screen............................................................................................................ 17
4-3-1 Version information check...................................................................................... 17
4-4 Getting ready for measurement........................................................................................ 18
4-4-1 Connecting the sampling tubes ............................................................................. 18
4-4-2 Selecting the connection method to the mask....................................................... 18
4-4-3 Checking and adjusting the flow rate and checking the concentration of
particles in ambient air.......................................................................................... 20
4-4-4 When condensation occurs in the Test Guide(s) or the sampling tube(s)............ 20
5Measurement................................................................................................................... 21
5-1 Measurement screen configuration .................................................................................. 21
5-1-1 Code No. Input....................................................................................................... 24
5-2 Fit Test mode .................................................................................................................... 25
5-3 Daily Check mode ............................................................................................................ 31
5-4 Fit Check mode ................................................................................................................ 33
5-5 Training mode................................................................................................................... 35
6Settings............................................................................................................................ 37
6-1 Setting menu .................................................................................................................... 37
6-2 Basic workflow of making settings.................................................................................... 38
6-3 Fit Test settings................................................................................................................. 42
6-4 Fit Check settings ............................................................................................................. 45
6-5 Daily Check settings ......................................................................................................... 46
6-6 Training settings................................................................................................................ 47
6-7 Date and time settings...................................................................................................... 48
6-8 Basic settings.................................................................................................................... 49
6-9 Log data............................................................................................................................ 51
7External output................................................................................................................ 52
8Maintenance .................................................................................................................... 55
8-1 Inspection ......................................................................................................................... 55
8-2 Operation check using clean air ....................................................................................... 55
8-3 Cleaning and storage ....................................................................................................... 56
8-4 About consumables .......................................................................................................... 56
8-5 Backup battery replacement............................................................................................. 57
9Troubleshooting.............................................................................................................. 58
10 Main specifications......................................................................................................... 59
11 Warranty, repair, etc........................................................................................................ 61

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1 Before use
1-1 About the operation manual
● The operation manual for this product consists of two parts. For the use of the PC software, refer
to the operation manual (for the PC software).
● We have released following latest version to improve the function of this instrument. For the
operation method, please refer to the following and subsequent versions.
SYSTEM VERSION 2.20
FIRMWARE VERSION 2.20
SIBATA Fit Test Software 2.20
● The content of this operation manual is subject to change without prior notice for product
improvement or other reasons.
● Great care has been taken in the creation of this manual; however, should any questionable points,
errors, or omissions be apparent, please contact us.
● Copyright © 2021 Sibata Scientific Technology Ltd. All rights reserved. This document is
copyrighted by Sibata Scientific Technology Ltd. The information contained herein shall not be
copied, reproduced, or changed wholly or in part without prior written permission from Sibata
Scientific Technology Ltd.
● This manual uses the following notational conventions for terms, indications, and operations related
to this product.
[XXX]: Brackets [ ] are used for items displayed on the case / touch panel, such as names of
operation buttons.
1-2 About the package contents
Unpack and make sure that none of the following items is missing or damaged:
□MT-05U main unit .................................................... 1 unit
□AC adapter (fitted with a plug; supplied with three spare plugs) .............. 1 pc
□Sampling tube (pair tube) 1.5 m ........................................ 2 pcs
□Strap clip ............................................................ 1 pc
□High-performance zero check filter ...................................... 1 pc
□Tube Joint Set Type M 100 pairs/set .................................... 1 box
□Tube Joint Attachment Tool Type M ..................................... 1 box
□Suction port caps (fitted on the main unit) ............................... 2 pcs
□External output connector cap (fitted on the main unit) ..................... 1 pc
□USB connector cap (fitted on the main unit) ............................... 1 pc
□CD-ROM (Communication Software, USB Driver, Operation Manuals) ....... 1 pc
□USB cable (A-mini B) .................................................. 1 pc
□Soft case ............................................................ 1 pc
□MANUFACTURER’S INSPECTION AND CALIBRATION CERTIFICATE ... 1 copy
□Important safety information .......................................... 1 copy
● If any of the above items is damaged or missing, contact your dealer or us.

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1-3 Limited warranty
Please be aware that measurements provided by this product are just an assessment of respirator fit
during a Fit Test. Respirator fit on other occasions may be different. The fit factor value is not intended
for use in calculating an individual exposure to actual hazardous substances. Therefore, please
understand that we will not be liable for any loss or damage if it is used for purposes other than the said
assessment.

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2 Important safety information
This operation manual contains warnings and cautions intended to ensure the safe and proper use of
this product and prevent any bodily harm or property damage to the user or any other person. These
are all important safety instructions. Before use, carefully read, fully understand, and strictly comply with
these instructions.
2-1 User (Important)
This product should only be operated by persons who have sufficient technical expertise, training, or
experience to understand the possible risks associated with its use. Anyone untrained or under
training is allowed to operate it only under proper supervision of someone with a trained or technical
background.
This operation manual assumes that this product will be operated by someone with a good
understanding of the possible risks associated with its use.
2-2 Graphical symbols
This manual uses two different alert symbols, ‘Warnings’ and ‘Cautions,’ depending on the
consequence or damage that may arise from improper use in disregard thereof. Be sure to follow
these important safety instructions.
Risk/damage levels and corresponding symbols
Indicates information that, if ignored, could result in personal
injury or even death due to incorrect handling.
Indicates information that, if ignored, could result in personal
injury or property damage due to incorrect handling.
•This product is not explosion-proof. Avoid use near combustibles or flammables.
•Do not subject this product to strong impacts or allow it to drop onto a hard surface. Failure to comply
may cause malfunction or accident.
•Do not attempt any disassembly or modification. Failure to comply may cause malfunction or accident.
•This product is intended for indoor use. Use it indoors at an altitude of 2,000 m or less.
•If lightning has struck somewhere nearby, turn off the power and remove the power plug from the
outlet. Failure to comply may cause electric shock or fire.
•If anything unusual occurs during operation, stop operation immediately to eliminate the cause. If this
product is responsible for the anomaly, turn off the power switch and remove the power plug from the
outlet. Then contact your dealer or us. Do not use this product in an abnormal condition. Only service
personnel are allowed to disassemble or repair this product. Failure to comply may cause malfunction
or accident.
•Do not operate this product with it covered or wrapped with a cloth or a blanket. This will cause heat
buildup, which may result in fire or failure.
•Do not expose this product to water or any other liquid. Failure to comply will cause this product to
break down.

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•Strictly adhere to the usage temperature range (5 to 40°C). Failure to comply may cause malfunction
or accident.
•Do not use any AC adapter that was not included with this product.
•Use only with a single-phase 100 to 240 ±10％VAC power supply. Do not plug into a power strip.
Failure to comply may cause electric shock or fire. When required to use a voltage other than the
specified one, contact your dealer or us for consultation.
•Do not operate with a damaged power cable or a loose outlet. Failure to comply may cause fire or
electric shock.
•Do not touch the power cable, the plug, or the outlet with a wet hand. Failure to comply may cause
electric shock.
•Do not use a wire or any other metal to connect the connector on the rear side of the main unit; nor
try any connection method other than one specified herein. Failure to comply may cause fire or
damage to the equipment.
•Do not insert a wire or any other foreign object into the suction ports or the dryer. Failure to comply
may cause malfunction.
•Do not use this product under an atmosphere other than air, such as toxic, acidic, or alkaline gases.
Failure to comply may cause malfunction, explosion, or fire.
•If the equipment is used in a manner not specified by manufacturer, the protection provided by the
equipment may be impaired.
•Do not swing around this product when moving it. Failure to comply may cause malfunction or
personal injury.
•Install and use this product on a flat, stable surface. Failure to comply may cause malfunction,
accident, or erratic operation.
•Avoid installation or storage in a place exposed to strong direct sunlight or near a fire or any other
heat source. Failure to comply may cause erratic operation or malfunction.
•Do not get on top of this product or place any heavy objects on top of it. Failure to comply may cause
deformation and accident or malfunction.
•Do not wash this product with water. Failure to comply may cause electric shock, fire, or malfunction.
•When not in use, remove the power plug from the outlet. Failure to comply may cause fire or
malfunction.
•Before cleaning, remove the power plug from the outlet. Failure to comply may cause fire or
malfunction. Do not clean with alcohol or any organic solvent (thinner, benzene, etc.) other than
ethanol. Failure to comply may result in peeling of the coating.
As the AC adapter is not protected against liquids, do not use ethanol or the like for cleaning.
•Always unplug the power cable holding the plug, not the cable itself. Failure to comply will cause
damage to the cable and may result in electric shock or fire.
•Do not place any heavy objects on the power cable or tread on it. Failure to comply may cause wire
breakage, electric shock, or fire.
•Carefully avoid hitting any part of your body on the suction ports or any other protrusion. This product
is delivered with rounded corners and other safety precautions taken for potentially dangerous parts.
To ensure safety, use with due care. Failure to comply may cause personal injury.

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•Some materials used in this product (including accessories and options) may cause allergic
reactions. If you have any allergies, be sure to check that you are not allergic to any of the
materials (see p.60). Avoid using the product if you are allergic to any of the materials.
•Be careful not to trip over or let your hands be caught by the sampling tube, power cord, or USB cable.
Such accidents might cause a failure or injury.
•Take great care not to stab your hands or fingers with the tip of the Tube Joint Attachment Tool. In
addition, do not direct the tip toward anybody. Doing so may cause injury.
•Do not drop this product. Doing so might cause a failure or injury.
•Depending on the environment, staying in the measurement area for an extended period may make
you feel ill. In such a case, immediately stop the measurement and move away from the
measurement environment until you feel better.
•Use USB cables that come with this product or one that is 3 m or less in length.
2-3 Caution labels
Caution labels are attached to the rear side of the product. Observe the contents of the labels when
using the product.
AVOID SHOCK
Do not subject this product to strong impact or drop it. Doing so
may cause a failure or accidents.
KEEP DRY
Do not touch the power cable, power plug, or power outlet with
wet hands. In addition, do not wash this product with water. Doing
so might cause electric shock or fire.

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3 About this product
3-1 Overview
This product is a measuring instrument used to check the fit of a dust mask (disposable or
replaceable) in use and can be used for measurements in general rooms.
Each human face differs in shape. There are, however, a wide variety of dust masks (hereinafter
referred to as “masks”) available from various mask manufacturers. Thus, anyone required to wear a
mask can select one that best fits their face. To take full advantage of the performance of a mask, it
must be handled properly and checked for fit to the face.
This product is a measuring instrument used to check the fit of the contact surface of a mask to the
face of the mask user. A gap, depending on its size, will cause the ingress of indoor dust into the
mask. This product can measure the degree of inward leakage. By wearing a mask in such a way as
to minimize the degree of inward leakage, the mask user can take full advantage of the effect of mask
wearing or the so-called inherent performance of the mask.
This product is equipped with a light scattering particle counter as its detector module, which counts
the particles exceeding a predetermined size per unit volume of air sample. This product
automatically takes and changes air samples according to a preset schedule.
The degree of inward leakage, which is Leakage Percentage, can be measured as follows: first, take
a sample of air near the mask to count indoor airborne (ambient) dust particles; then, take an air
sample from within the mask worn by the user to count dust particles in the air sample; and calculate
the ratio of the two counts as the Leakage Percentage. The following procedure is used to quantify
the fit of a mask.
Exhaled breath contains a lot of moisture. At a low room temperature, e.g., during winter, the moisture
and dust particles in the in-mask air sample combine and cause mist formation in the sampling tube(s).
This problem is solved by reheating the air sample up to the exhaled breath temperature using the
heater module provided in the passage leading to the detector.
3-2 Features
Smaller in size and weight than our previous model (MT-03) and equipped standard with a mask-fit-
check mirror.*
In addition to the conventional measurement method, this model is equipped with three new
measurement modes (four modes in total) to expand its measurement capability. This allows
measurement during exercise and its customization.
This model saves measurement data in the main unit and its supplied PC software allows data
transfer to a personal computer and creation of reports. In addition, it also allows the user to perform
measurement via the PC software.
To allow for operational simplicity of functions, a large, easy-to-see color LCD touch panel (pressure-
sensitive type) is adopted for display and operation, while a pushbutton switch dedicated to the
measurement start operation is provided independently.
As for the connection method to the mask, a Tube Joint (push-on ring type) is supplied standard. The
Test Guides (optional accessories) are the mask-fit-check tools for use with a mask actually worn.
The Tube Joint can minimize leakage from the connection points.
* The mirror is made of a material cleanable with ethanol. This makes the reflected image a little dull.
The user is asked to understand that the mirror is designed as such.

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•Particle counter system adopted for detection
•Automatic in-room (ambient) and in-mask air sampling and switching between them
•Capable of determining the degree of inward leakage into the mask based on the comparison
between the in-mask and ambient particle counts
•Built-in re-heater for preventing particulate-laden mist and condensation from occurring due to the
moisture in exhaled breath. Auto-dryer function also available to facilitate the drying of the inside of
the tube as soon as the measurement completes (see p. 49).
•Pump operation function for preventing exhaled breath remaining in the product from flowing
backward (see p. 49).
•Concentration function for measuring the concentration of particles in ambient air (see p. 20).
•Smaller in size and weight and functionally more advanced than our previous model.
•Capable of saving measurement data in the main unit. PC software for report creation.
Also allows measurement via the PC software as well as immediate report creation.
•Color LCD touch panel (pressure-sensitive type) for display and operation. Independent pushbutton
switch dedicated to measurement start.
•Test Guides (optional accessories) and Tube Joint (push-on ring type, standard accessory) available
as the method for connection to the mask.
3-3 Principle of measurement
Particle counting
The principle of counting particles in an air sample is as follows:
When convergent light is applied to particles (dust) floating in air, scattered light will be reflected from
the particles. The intensity of this scattered light correlates with the particle size. The scattered light
intensity may vary depending on physical properties of dust (color, shape, refractive index, etc.), even
if the particle size is the same.
The interactions between particles and light (electromagnetic waves) such as scattering, absorption,
and diffraction are systematically explained by Mie’s theory. Using the scattering phenomenon
supported by this theory, this product performs particle counting.
The principle of detection by the detector of this product is as follows: A particulate-laden air sample
is led into the detection zone inside the detector through the nozzle of the tubing in the detector. This
zone is a cylindrical zone consisting of an air passage pathway and a laser beam pathway disposed
orthogonally thereto. A laser beam is applied to particles passing through this zone. Then during
passage through the zone, the particles irradiated with the laser beam reflect scattered light. This
detection zone has a capacity small enough to let only one particle in at a time even if the air sample
is heavily laden with particles. This scattered light exists only for an instant; only this scattered light is
converged by a lens for detection by a photosensor. This photosensor produces a pulsating
photocurrent, the magnitude of which is proportional to the intensity of the aforementioned scattered
light. This photocurrent is discriminated against a reference value (the current value corresponding
to a reference particle size) by an electronic circuit and counted only when exceeding the reference
value. In this way, the count concentration of particles exceeding the reference particle size per air
sample is determined.

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Quantifying the fit of a mask
The fit of a mask to the face of the mask user is quantified as follows:
If there is a gap wide enough to allow particles to pass through between the mask and the face of the
mask user, ambient particles will leak into the mask during inhalation depending on the gap size. The
degree of fit can be numerically expressed as the ratio of the particle count per unit volume of the in-
room air (ambient air) near the mask to that of the air in the mask.
For this product, this degree of fit is expressed as the Leakage Percentage given by the following
formula:
𝐿𝑃 =
𝐶
𝐶
× 100
𝐿𝑃: Leakage Percentage [%]
𝐶: Ambient (outside) count
𝐶: In-mask (inward) count
The ‘Fit Factor,’ the indicator that shows the relative cleanliness of the in-mask air to the ambient air,
is determined from the Leakage Percentage using the following formula:
𝐹𝐹 =
100
𝐿𝑃
𝐹𝐹: Fit factor
The overall Leakage Percentage (average leakage percentage) is calculated based on the arithmetic-
mean Leakage Percentage of a multiple number of measurements taken.
The overall Fit Factor (mean fit factor) is determined by substituting the arithmetic-mean Leakage
Percentage of individual measurements (overall Leakage Percentage) into the above formula
(harmonic mean of ‘Fit Factors’ of individual measurements):
𝐿𝑃
=
𝐿𝑃
+𝐿𝑃 +𝐿𝑃 +
・・・ +𝐿𝑃

𝑛
𝐹𝐹
=
100
𝐿𝑃

=
100𝑛
𝐿𝑃
+𝐿𝑃 +𝐿𝑃 +
・・・ +𝐿𝑃

=
𝑛
1
𝐹𝐹

+1
𝐹𝐹

+1
𝐹𝐹

+ ・・・ +1
𝐹𝐹

𝑛: Number of measurements
𝐿𝑃
: Overall leakage percentage [%]
𝐹𝐹
: Overall fit factor