Sibata AP-632TL User manual

CODE 080000-6311
080000-6312
080000-6313
Operation Manual
Thank you for purchasing this product.
Be sure to read this operation manual before use.
Handle this product in accordance with the explanations described in this manual.
After reading this operation manual, keep it with the warranty in a safe place.
If you find any unclear points in this manual, please contact your Sibata agent.
SIBATA SCIENTIFIC TECHNOLOGY LTD.
DIGITAL DUST INDICATOR
AP-632TL / AP-632TM / AP-632TH

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Table of Contents
Using the Product Correctly and Safely ..................................................4
1Overview...............................................................................................5
2Measurement Principle........................................................................5
3Sensitivity.............................................................................................5
4Measurement Values ...........................................................................6
5Specifications ......................................................................................6
6System Configuration .........................................................................7
7Description of Parts.............................................................................8
8Measurement Method........................................................................12
9Maintenance, Inspection, and Precautions .....................................13
10 List of Accessories ............................................................................15
11 Warranty .............................................................................................16

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Using the Product Correctly and Safely
To ensure correct use, read this operation manual thoroughly before handling this product.
In addition, keep this manual in an easily accessible location.
Before Using the Product
(Be sure to read this, and handle this product with due care.)
•Install this product horizontally at a stable location.
•Be sure to connect the power cord grounding wire.
•This product is not explosion-proofed, so do not use it in the vicinity of combustible or flammable
substances.
•[Modifications and Repairs Are Prohibited] Never disassemble or modify this product, as doing so will
void the warranty with Sibata. Doing so may also result in unforeseen faults and accidents.
•If a fault occurs, request repairs immediately. Never leave the fault as is, or attempt your own repairs,
as subsequent use may result in unforeseen accidents.
•If the product becomes dirty, wipe away the dirt with a soft cloth (soaked in detergent if there is
significant dirt).
•If the product emits smoke, becomes very hot, or the product makes a strange noise, stop using it
immediately. Turn OFF the power switch, remove the power plug from the power outlet, and request
repairs.
•When removing the power plug from the outlet, hold the cord by the power plug to avoid pulling on
the power cord. Be sure your hands are dry before handling the power cord. Otherwise, there is a risk
of electric shocks.
•Do not bend, stretch, or twist the cord. Do not connect it to a different cord.
•If you notice that the cord has become damaged, or broken, or the plug does not connect properly,
stop using it immediately, and request repairs.

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1 Overview
The typical method used for determining the concentration of airborne particulate matter involves using
suction to collect particles directly onto a paper filter and then weighing the filter. However, that method
requires sophisticated measurement technology, complicated operations, and, for low concentrations,
long sampling times. Furthermore, the method cannot be used for continuous measurements of
spatiotemporally instantaneous values.
In such cases, there is an interactive relationship between the airborne particulate matter and,
furthermore, it is probably more appropriate to measure easily-measurable physical quantities. The light
scattering-based detector is designed as a dust concentration indicator for applications such as
atmospheric monitoring and other concentration measurements, for measuring the effectiveness of
filters and other dust removal devices, for controlling concentration levels in dust exposure and animal
inhalation tests, and for evaluating the performance of ventilation and air purification equipment.
It is intended for use in combination with various display devices and data processing equipment.
2 Measurement Principle
The dust indicator is based on the principle that when light is shone on airborne particulate matter in a
dark room, the amount of light that is scattered by the matter is proportional to the mass concentration
of the matter, provided the particulate matter has the same physical properties (such as reflectance,
size, shape, specific weight, and color). The actual system passes the air sample through a stabilized
light beam inside a dark compartment. The light scattered by the airborne particulate matter enters a
photomultiplier tube located in a thermostatic chamber, which converts the light to a photoelectric
current. When the photoelectric current output multiplied by time becomes a constant value, a circuit
that integrates the photometric current for one pulse is used to convert the photometric current into a
pulse that is proportional to the amount of light scattering. Therefore, the relative mass concentration of
airborne particulate matter can be determined by adding up the number of pulses per unit time.
Values measured using this method are referred to as relative concentration values. Since the values
measured by the digital dust indicator have sensitivity values specified in units of mass concentration
(µg/m3), it is unnecessary to measure the absolute quantity of air tested.
3 Sensitivity
Structurally two types of detectors are available (the AP-632T detector connects via tubes, whereas the
AP-632F connects via flanges). These are used in three models (L, M, and H) with different sensitivity
levels.
The standard particles used to determine mass sensitivity values are calibrated based on filtration
collection of monodispersed stearic acid particles with a mean 0.3 µm diameter.
Model Sensitivity
AP-632T (F) L 1CPM = 10 µg/m3
AP-632T (F) M 1CPM = 1 µg/m3
AP-632T (F) H 1CPM = 0.1 µg/m3
(CPM = counts per minute)
The sensitivity of the instrument is determined based on stearic acid particles with a mean diameter of
0.3 µm, but instrument sensitivity is routinely maintained by approximation using an optical attenuator
for relative sensitivity adjustments (hereinafter a "standard scattering plate").
However, it is recommended that the device be calibrated about once a year, due to unavoidable
changes resulting from vibration, changes in the standard scattering plate over time, or other factors.

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4 Measurement Values
Due to characteristics of the light scattering method, relative concentration measurement values must
be corrected if measurements for particulate matter other than standard particles (stearic acid particles
with a mean diameter of 0.3 µm) are used to evaluate mass concentration. There are many factors
such as differences in substances to be measured and differences in particle size distribution in order to
obtain correction coefficients for all particles in advance.
The best and most efficient method for evaluating the mass concentration of actual particulate matter
being measured is the relative concentration measurement method, which involves weighing the filter in
combination with using the digital dust indicator and then determining the correction factor for the actual
measurement site based on comparison data. It is also helpful to first determine the correction factor
before generating test powders for dust experiments or controlling the dust concentration for testing the
filtering efficiency of filter materials, the collection efficiency of dust collectors, or the dust resistance of
parts.
5 Specifications
Detection Sensitivity 1CPM =0.1 to 10 µg/m3
(criterion of stearic acid particles with a mean diameter of 0.3 µm)
Measurement Range 10 to 105 CPM
Measurement Accuracy Max. ±10 % (criterion of stearic acid particles)
Ambient Temperature - 10 to 40 °C
Intake Rate About 35 L/min through a 18 mm I.D. x 5 m long sampling hose
Output
Open collector (sink current max. 10 mA at 30 V)
Transmission pulse output via max. 2 km wired connection
Data recorder output min. 100 kΩat 0 to 10 mV
Power Supply 100 VAC ±10 V, 50/60 Hz
Power Consumption About 70 VA
Dimensions
270(W)×390(D)×250(H)mm
Weight About 15 kg
Note) Shape, dimensions, specifications, and other product information are subject to change without
notice in the interest of product improvement to the extent that product functions and
applications will not be impaired.

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6 System Configuration
Fig.1
The detector unit uses the photoelectric current integration circuit to convert the light scattering that
corresponds to airborne dust concentration into a pulse signal.
To prevent relative sensitivity fluctuations due to temperature variations, a thermostatic chamber
controls the temperature of the photomultiplier tube to within 40 ±1 °C. The waveform of the output from
the photoelectric current integration circuit is shaped and then converted to a direct reader signal,
counter pulse, and transmission pulse. A differential-type 3-core twisted cable (optional) is used to
minimize noise and enable transmission for up to 2 km.
Detector
Intake fan
Cooling fan
Thermostatic chamber
circuit
Light source circuit
High voltage circuit
Power supply circuit
D-A converter
Pulse circuit
Rate meter
Pulse transmission circuit
Recorder output circuit
Pulse output circuit
Photoelectric current
integration circuit
Span check circuit
Waveform shaping circuit
Meter drive circuit
Range switching circuit

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7 Description of Parts
[1] Front Panel
(1) POWER Switches the power ON or OFF.
(2) LAMP Switches light source ON or OFF and the switch also serves as the switch
for the cooling propeller fan.
(3) H.V Switches the high voltage circuit ON or OFF.
(4) SENSI.ADJ
This multi-rotational variable resistor can be rotated 10 revolutions to make
fine adjustments to sensitivity (changes sensitivity by about 10 % per
revolution).
(5) RANGE Switches between three ranges for the monitor meter, either 1x, 10x, or
100x for 0 to 1000 cpm.
(6) MONITOR
The scale indicated on the direct reader used to display instantaneous
values is from 0 to 1000 cpm, where by switching between the three ranges
it can be used to directly read values up to 105cpm.
(7) ZERO RESET This screw adjusts the zero point for the monitor meter.
(8) PILOT LAMP This illuminates to indicate the power is ON.
(9) LIGHT TRAP
This cap is removed to mount a standard scattering plate for adjusting
sensitivity using a light trap. Normally, it is used to absorb the light beam
from the light source.

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[2] Rear Panel
(10) Ground terminal : To prevent electric shock and minimize noise, always connect this
terminal to ground.
(11) Power supply connector : Use the power cord to connect this connector to a 100 V AC power
supply.
(12) Output connector (6-pin) : Internal wire connections are indicated below.
(1) and (3) : Open collector output
(2), (4), and (5) : Wired transmission output for max. 2 km
(6) : 5 V DC power supply for driving the external photocoupler
(13) Output connector (5-pin)
(1) and (3) : 0 to 10 mV output
Min. 100 kΩload resistance
Note: Data cannot be transmitted over long distances.
(14) Exhaust port : Sampled air is discharged via this port.
(15) Air intake port : Includes an adapter for connecting the air intake hose.
Air intake port
Exhaust
port

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[3] Side Exterior
(16) Cooling exhaust port : The internal propeller fan blows heat from the detector light source,
amplifier, and other components out this port.
(17) Cooling intake port : This port takes in air for cooling. Be careful to prevent blocking this
port, such as when placing the unit on a rack.
[4] Internal Structure
(18) Air Tube : Air tube connected from the air intake port to the detector.
(19) Thermostatic chamber : This thermostatic chamber for the photomultiplier tube is controlled to
a setting of 40 ±1 °C to stabilize the dark current and prevent
condensation from forming on the scattered light input surface.
(20) Temperature gauge : Used to monitor the temperature in the thermostatic chamber.
(21) Photomultiplier tube : Used to convert scattered light into an electrical signal, it features an
input surface on the side and nine secondary electron amplification
electrodes.
(22) Circuit board case : The subchassis houses the printed circuit board that contains all
circuits.
(23) Light source lamp socket : The lamp and socket are fabricated as a single unit, which is fastened
with two specialized screws.
An air outlet is located at this
position that corresponds to the
center surface of the instrument.
An air inlet for cooling air is located at
this position that corresponds to the
rear surface of the instrument. 5 mesh.
For maintenance, put fingers to the
back of this area and pull it forward.

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(24) Guide rails : Used to slide out the interior of the instrument for maintenance, the
instrument can be removed from the case by unscrewing four screws
from the rear side of the instrument.
(25) Detector : Air drawn in from outside the instrument passes through this area,
where the amount of dust in the air is converted to a corresponding
amount of scattered light. The measurement angle is 135 degrees.
(26) Exhaust duct : After passing past the detector, the air flows through this duct and is
discharged outside the instrument.
(27) Filter holder : To prevent dust from the contaminating the scattered light input area,
lower pressure inside the detector is used to generate clean air and
send it into the light input area.
(28) Fuse : The instrument uses a 2 A tube fuse.
(29) Air intake fan connector : Connects to the centrifugal fan installed below the detector.
Note: For systems designed to take in external air, the centrifugal
fan is removed and connected to the exhaust duct via a
flange and glass tube.
(30) Cooling fan connector : Connects to the forced-air propeller cooling fan for the light source
lamp and other power supply circuit.
(31) Power connector : Connects between the output terminal strip and the components
mounted on the guide rails.

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8 Measurement Method
Prepare the tubing joints, intake pump, flow meter, and other components to be used for the given
application. Similarly, connect the display unit using the provided cable that is appropriate for the given
application.
(1) Connect the power cord to a 100 V AC power supply and turn the power switch ON.
The pilot lamp illuminates.
(2) Turn the lamp switch ON. The air intake centrifugal fan and the cooling fan start rotating.
(3) Turn the high voltage switch ON.
After the above steps, the system is operational, but requires about three hours to fully stabilize.
Sensitivity will fluctuate by about 5 % until stabilized.
(4) Adjust the sensitivity.
In this case, sensitivity refers to the relative sensitivity of the instrument to measure the mass
concentration of standard dust. To maintain consistent sensitivity, sensitivity is adjusted by installing
a standard scattering plate to the detector.
(5) Remove the standard scattering plate from the provided storage box and remove the protective
case.
(6) Remove the cap from the light trap in the center of the front panel by rotating it several times to the
left. Align the 3 mm diameter set screw on the standard scattering plate with the groove in the
detector flange and screw it all the way in to secure the plate.
(7) Set the meter range to [x10] and use the provided screwdriver to adjust the sensitivity while
watching the value indicated on the monitor meter until the indicated value is approximately the
same as the value indicated on the standard scattering plate.
(8) Depending on the application, the standard scattering plate does not need to be adjusted
accurately to within a few counts, but perform a one-minute measurement repeatedly several times
and adjust it to within ±5 % of the indicated value.
Note: If used to monitor the environment, the mass conversion factor must be determined for the
given location by measuring standard dust in parallel with a low-volume air sampler for the
corresponding sensitivity criterion value. Two detectors are used for applications such as
generating a test powder for evaluating filtering efficiency. However, even if they have some
levels of different sensitivity, typical test requires determining a blank value (a correction
value for sensitivity differences), so it is more important to confirm their stability than to
accurately match their sensitivity levels.
(9) After matching the sensitivity levels, remove the standard scattering plate and screw in the cap. If
the cap is difficult to rotate, apply a small amount of the provided grease to the threads and O-ring.

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9 Maintenance, Inspection, and Precautions
(1) The filter inside the standard scattering plate is for preventing dust from contaminating internal
mechanisms by utilizing the lower pressure inside the detector unit to supply clean air. For normal
operating environments, replacing the filter once a year should be sufficient, but replace the filter
whenever it become dirty. Remove the screw at the front edge of the standard scattering plate and
replace the filter with a 47 mm diameter glass fiber filter provided.
(2) Always attach the protective case before storing the standard scattering plate in the storage box.
Handle it with particular care. Occasionally clean the light input surface and white scattering plate
surface on the scattering plate with gauze or other means.
Scattering plate values may fluctuate or change over time if dropped or after extensive use.
To calibrate the sensitivity, contact a Sibata representative.
(3) Replace the light source lamp as follows.
The light source lamp must be replaced after six months of continuous operation. After replacing
the lamp, simply use the two fastening screws to fasten the light source lamp to the specialized
socket. Not optical axis or focus adjustments are necessary.
a. Clean the glass surface of the provided spare lamp with gauze or other means, and then
remove it by loosening the two screws on the cover, as indicated with an arrow. Disconnect the
two socket lead wires from the terminal block.
b. Next, use a screwdriver to loosen the two screws that fasten the light source lamp socket and
then rotate them by hand. There is no polarity involved. Reinstall the cover that was removed
earlier.
c. Turn the lamp switch ON and wait for about 10 minutes to stabilize. Then adjust the sensitivity
according to the sensitivity adjustment method described earlier.

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(4) Replace the filter as described below.
To prevent contamination from dust flowing past the detector input surface, a filter (indicated with
an arrow) uses the lower pressure inside the detector to continuously generate and supply clean
air to the light input area.
Therefore, for environmental monitoring, this filter must be replaced when dirty or at least once a
year.
a. Rotate the portion indicated with the arrow toward the left and then remove the filter with
tweezers.
b. Replace the old filter with one provided 47 mm diameter glass fiber filter. The filter may be
oriented with either side facing outward.
c. Place the donut-shaped ring on the filter and then firmly screw in the filter holder.
That completes the filter replacement process.
(5) Clean the detector as follows.

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a. Turn the high voltage switch OFF.
b. Remove the three screws indicated with arrows and then remove the top cover by pulling it
forward.
c. Scrape off any dust accumulations inside using the brush tool provided. Clean those areas that
can be reached with the brush. Dislodged dust will be quickly discharged outside the instrument
by the air intake fan, which is running during this process.
d. Remove the screw in the center of the cover to separate the unit into two parts and then
remove the dust inside the exposed areas.
e. Reassemble the cover as it was previously. Make sure the cover orientation and O-ring position
are correct.
(6) Clean the circuit board as follows.
a. Turn the power switch OFF.
b. Loosen the screw on the circuit board case and remove the screw.
c. Pull out the printed circuit board and thoroughly clean off any dust from the front and back sides
of the board, using the brush tool provided. Also clean the dust from inside the case.
d. Insert the circuit board securely all the way into the case and close the cover.
10 List of Accessories
1. A standard scattering plate (with protective case)················1
2. Spare lamps (with specialized socket) ······························2
3. Filters (GB-100R 47-mm dia.) ································100 pcs
4. 5-pin connector ····························································1
5. 6-pin connector ····························································1
6. Power cord ····························································· 3 m
7. Grounding wires (green) ············································ 3 m
8. Fuse (2 A tube fuse)······················································2
9. Screwdrivers (one large and one small) ···················· 1 each
10. Tweezers····································································1
11. Plastic tubing (19 mm dia. x 23 mm dia.)······················· 5 m
12. Grease·······································································1
13. Accessories storage box················································1
14. Brush·········································································1
15. Thumb screws, 4x10 (for securing main unit) ·····················2

11 Warranty
If a Sibata product fails within one year from date of purchase, it will be repaired free of charge.
To request repairs, contact your Sibata representative.
Be sure to provide the item code, product name, model number, serial number, a description of the
problem, and other relevant information.
The warranty excludes consumable parts included with the product, products without the purchase date
or distributor information recorded, and products for which warranty information was revised.
The warranty excludes any problems resulting from any of the following causes. Such repairs are
subject to normal service fees.
(1) Faults or damage due to improper usage
(2) Faults or damage resulting from repairs or modifications implemented by parties other than Sibata
(3) Faults caused by abuse or inadequate maintenance
(4) Faults or damage resulting from fires or natural disasters, such as earthquakes
(5) Faults or damage occurring after purchase due to relocation, movement, falling, or vibration
(6) Faults or damage resulting from the use of consumable items not specified by Sibata
23.08.31 K(08)