Laser Particle Sensor
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Model: PM900
Version: V1.2
1. Overview
PM-900 is a laser-based particle sensor which uses
light scattering method to detect and count
particles and calculate PM1.0, PM2.5 and PM10
concentration in a given environment. The sensor
features an imported processing chip and
photosensitive element. Signals are collected and
processed by the microprocessor chip and then
output in digital format. The sensor is ideal to
detect the concentration of different particles
precisely in real time.
2. Applications
Air purifiers, air quality detectors, fresh air systems,
air conditioners and automobiles with air purifying
function, consumer electronics.
3. Value to Customers
Consistent, stable, reliable.
Small zero drift, good repeatability.
Compact size, easy to mount.
Low power consumption, long service life.
High sensitivity, fast response.
Proven EMC and EMI performance, strong
anti-interference.
4. Working Principle
The sensor is based on the particle concentration
analysis technology of Mie scattering theory. A
laser light source illuminates a particle as it is pulled
through the detection chamber. The particles are
scattering when passing through the laser beam.
The information processing circuit converts the
light intensity signal of the scattered light via the
photoelectric sensor into a voltage pulse signal,
which is preamplified, converted by AD into digital
signal. After noise processing and optimal
algorithm analysis, particle count with the
equivalent particle size per unit volume can be
obtained, and then the particle concentration is
calculated. Refer to the following figure for how
the principle works:
Laser Particle Sensor
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5. Technical Data
Output data
PM1.0, PM2.5, PM10
concentration and particle
count
Concentration
range (PM2.5)
0~999μg/m³
Effective range
(PM2.5)
0-500μg/m³
Accuracy
±10μg/m³ (0-100μg/m³)
±10% (100-500μg/m³)
Minimum
distinguishable
particle diameter
0.3µm
Power supply
5V±0.1V (Ripple < 100mV)
Max working
current
100mA
Working
temperature
-10℃~60℃
Working humidity
0~95%RH(non-condensing)
Storage
temperature
-30℃~70℃
Response time
<1.5s
Resolution
1µg/m
3
Maximum
dimensions
47.9x36.8x11.8mm
6. Connector Pinout
Connector Definition
Pin
Name
Description
1
VCC
5V
2
VCC
5V
3
GND
——
4
GND
——
5
NC
N/A
6
NC
N/A
7
RX
UART RX output ,[email protected]
8
NC
N/A
9
TX
UART TX output ,[email protected]
10
CTRL
Control pin, active at high level,
level voltage: 3.3V;
inactive at low level
7. Communications Protocol
Serial communication protocol: 9600 N1 (Baud rate:
9600, length: 32 bytes, parity: none, stop bit: 1).
Serial communication reporting period: 1.5s
Name
Description
Note
Start bit 1
0x42
Frame header
Start bit 2
0x4D
The upper 8
bits of frame
length
0x00
Frame length
The lower 8
bits of frame
length
0x1C
The upper 8
bits of data 1
0XXX
PM1.0
concentration,
unit μg/m³
The lower 8
bits of data 1
0XXX
The upper 8
bits of data 2
0XXX
PM2.5
concentration,
unit μg/m³
The lower 8
bits of data 2
0XXX
The upper 8
bits of data 3
0XXX
PM10
concentration,
unit μg/m³
The lower 8
bits of data 3
0XXX
Laser Particle Sensor
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The upper 8
bits of data 4
0XXX
PM1.0
concentration,
unit μg/m³
(atmospheric
environment)
The lower 8
bits of data 4
0XXX
The upper 8
bits of data 5
0XXX
PM2.5
concentration,
unit μg/m³
(atmospheric
environment)
The lower 8
bits of data 5
0XXX
The upper 8
bits of data 6
0XXX
PM10
concentration,
unit μg/m³
(atmospheric
environment)
The lower 8
bits of data 6
0XXX
The upper 8
bits of data 7
0XXX
Particle
(diameter > 0.3)
count/0.1L
The lower 8
bits of data 7
0XXX
The upper 8
bits of data 8
0XXX
Particle
(diameter > 0.5)
count/0.1L
The lower 8
bits of data 8
0XXX
The upper 8
bits of data 9
0XXX
Particle
(diameter > 1.0)
count/0.1L
The lower 8
bits of data 9
0XXX
The upper 8
bits of data 10
0XXX
Particle
(diameter > 2.5)
count/0.1L
The lower 8
bits of data 10
0XXX
The upper 8
bits of data 11
0XXX
Particle
(diameter > 5)
count/0.1L
The lower 8
bits of data 11
0XXX
The upper 8
bits of data 12
0XXX
Particle
(diameter > 10)
count/0.1L
The lower 8
bits of data 12
0XXX
The upper 8
bits of data 13
0x80
Reserve
The lower 8
bits of data 13
0x00
The upper 8
bits of
checksum
0XXX
CRC check from
start bit to the
lower 8 bits of
data 13
The lower 8
bits of
checksum
0XXX
8. Dimensions
Laser Particle Sensor
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9. Typical Output Features
9.1 Compliance at room temperature
9.2 Compliance at low temperature
9.3 Compliance at high temperature
9.4 Compliance after long term running
0
100
200
300
400
500
600
700
1 2 3 4 5 6 7 8 9 10
μg/m³
Compliance Testing
（25℃，50%）
TSI8530
TEMTOP1
TEMTOP2
TEMTOP3
TEMTOP4
TEMTOP5
0
200
400
600
800
1 2 3 4 5 6 7 8 9 10
μg/m³
Compliance Testing
（-10℃）
TSI8530
TEMTOP1
TEMTOP2
TEMTOP3
TEMTOP4
TEMTOP5
0
200
400
600
800
1 2 3 4 5 6 7 8 9 10 11
μg/m³
Compliance Testing
（60℃）
TSI8530
TEMTOP1
TEMTOP2
TEMTOP3
TEMTOP4
TEMTOP5
0
200
400
600
800
1 2 3 4 5 6 7 8 9 10
μg/m³
Compliance Testing
（30D）
TSI8530
TEMTOP1
TEMTOP2
TEMTOP3
TEMTOP4
TEMTOP5
Laser Particle Sensor
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10. Reliability Testing
No.
Test item
Unit
Technical requirements
Quantity
Test result
Result
1
Stores at low
temperature
-
Store the sensors for 500 hours at
-30℃±2℃, then place them at room
temperature for 2 hours, and check
the compliance.
5PCS
Compliance:
0-100μg/m³:
±10;
100-500μg/m³;
±10%;
500-700μg/m³;
±15%;
The fan has no
obvious
abnormal
sound; the
appearance is
not deformed;
the output value
is stable.
Pass
2
Stores at high
temperature
-
Store the sensors for 500 hours at
70℃±2℃, then place them at
room temperature for 2 hours, and
check the compliance.
5PCS
Pass
3
Stores at high
temperature
and humidity
-
Place the sensors powered off at 70℃
±2℃and 90-95%RH for 500 hours,
then put them at room
temperature for 2 hours and test the
compliance.
5PCS
Pass
4
Power on and
off
-
Power on the sensors for 5 minutes
and then power off for 5 minutes.
Repeat such operations for 1000
times. Sample 10 points from 0 to
700μg/m³ in the testing device. All
data complies with the requirements.
5PCS
Pass
5
Operates at
low
temperature
-
The sensors run for 48 hours
continuously at -10℃±2℃. Sample 10
points from 0-700μg/m³ to in the
testing device. All data complies with
the requirements. Keep placing the
sensors to 120 hours and sample 10
points from 0 to 700μg/m³. All data
complies with the requirements.
5PCS
Pass
6
Operates at
high
temperature
-
The sensors run for 48 hours
continuously at 60℃±2℃. Sample 10
points from 0 to 700μg/m³ in the
testing device. All data complies with
the requirements. Keep placing the
sensors to 120 hours and sample 10
points from 0 to 700μg/m³. All data
complies with the requirements.
5PCS
Pass
Laser Particle Sensor
6 / 10
7
Cycle testing
at high and
low
temperature
-
Place the sensors powered off at 60℃
for 4 hours, and then put them at
-20℃ environment in 30 seconds for
4 hours. Repeat such operations for 5
times. Place them at room
temperature for 2 hours and check the
compliance.
5PCS
Compliance:
0-100μg/m³:
±15;
100-500μg/m³;
±15%;
500-700μg/m³;
±20%;
The fan has no
obvious
abnormal
sound; the
appearance is
not deformed;
the output value
is stable.
Pass
8
Operates at
high
temperature
and humidity
The sensors continuously run for 2
days at 60℃and 85%RH. Sample 10
points from 0 to 700μg/m³ in the
testing device. All data complies with
the requirements. Keep placing the
sensors to 5 days and sample 10
points from 0 to 700μg/m³. All data
complies with the requirements.
5PCS
Pass
9
Operates at
low
temperature
and humidity
-
The sensors continuously run for 48
hours at -10℃ and 20%RH. Sample
10 points from 0 to 700μg/m³ in the
testing device. All data complies with
the requirements. Keep placing the
sensors to 120 hours and sample 10
points from 0 to 700μg/m³. All data
complies with the requirements.
5PCS
Pass
10
Operates at
room
temperature
and high
humidity
-
The sensors continuously run for 48
hours at 25℃±2℃ and 85%RH.
Sample 10 points from 0 to 700μg/m³
in the testing device. All data complies
with the requirements. Keep placing
the sensors to 120 hours and sample
10 points from 0 to 700μg/m³. All data
complies with the requirements.
5PCS
Pass
11
Dusty test
-
Put 2g dry cement at 25℃ and
40%RH in a test chamber and use a
fan to blow it. Add 2g dry cement
every 24 hours. Keep the sensors
running for 48 hours in the chamber.
Then place the sensors in a normal
test chamber. Sample 10 points from 0
to 700μg/m³. All data complies with
the requirements. Repeat the testing
once and sample 10 points from 0 to
5PCS
Pass
Laser Particle Sensor
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700μg/m³. All data complies with the
requirements.
12
Automobile
exhaust test
-
Keep the test chamber at 25℃ and
40%RH, add 20ml gasoline into the tin
furnace and evaporate it at 200℃ for
30 minutes. Use a fan to blow in the
chamber. Repeat such operations
every 12 hours and continue for 2
days. Sample 10 points from 0 to
700μg/m³. All data complies with the
requirements. Keep placing to 4 days;
sample 10 points from 0 to 700μg/m³.
All data complies with the
requirements.
5PCS
Pass
13
Cooking fume
test
-
Keep the test chamber at 25℃ and
40%RH, add 20ml cooking oil into the
tin furnace and evaporate it at 200℃
for 30 minutes. Use a fan to blow in
the chamber. Repeat such operations
every 12 hours and continue for 2
days. Sample 10 points from 0 to
700μg/m³. All data complies with the
requirements. Keep placing to 4 days;
sample 10 points from 0 to 700μg/m³.
All data complies with the
requirements.
5PCS
Compliance:
0-100μg/m³:
±15;
100-500μg/m³;
±15%;
500-700μg/m³;
±20%;
The fan has no
obvious
abnormal
sound; the
output value is
stable.
Pass
14
Mixed gas test
-
Test the sensors in automobile
exhaust, cooking fumes and dusty
environment for 6 days in total (2 days
for each test). After all tests finish,
sample 10 points from 0 to 700μg/m³
in the chamber. All data complies with
the requirements.
5PCS
Pass
15
Operate for a
long period
-
Place the sensors powered on at room
temperature for 30 days and sample
10 points from 0 to 700μg/m³. All data
complies with the requirements.
5PCS
Pass
16
Vibration
-
Keep the 10 ㎡ test chamber at 20℃
and 50% humidity. Vibrate the sensors
under the conditions: vibrational
5PCS
Pass
Laser Particle Sensor
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frequency 50Hz, accelerated velocity
9.8/S2, direction of vibration x, y, z,
amplitude of vibration (vertical
direction) ±2mm, test duration 60
minutes in x, y, z direction respectively.
The particulate generator puffs smoke
and the air purifier regulates. Apply
DC 5V on the sensors to test their
compliance.
17
Zero drift
-
The sensors run for 2 hours and
full-span drift is no more than ±15%
of standard reading.
5PCS
Pass
18
Full-span drift
-
The sensors run for 2 hours and
full-span drift is no more than ±15%
of standard reading.
5PCS
Pass
19
Operating
current
mA
≤100
5PCS
Pass
20
Electrical fast
transient
burst
I/O
Port
The sample sensors work normally
after being tested at 4kV peak voltage
(level 4) and 5/100kHz group pulse
frequency.
5PCS
Pass
21
Electrostatic
discharge
(ESD)
-
No abnormal phenomena happen after
contact discharge with senor port
surface at 1KV test voltage and other
surfaces at 8KV (level 4) test voltage.
5PCS
Pass
22
Surge (Shock)
-
Industrial level 4.
5PCS
Pass
23
Drop
-
The sample sensors drop freely at 1m
height twice from different angles.
Then power on the sensors and they
function normally.
5PCS
Pass
24
Salt spray test
-
Place the sensors in a salt spray test
chamber at 35℃, apply 5% sodium
chloride solution to pray them for 48
hours. Then clean them up with water.
No red rust is generated on their
surface.
5PCS
No rust or color
change on the
metal pieces.
Pass
Laser Particle Sensor
9 / 10
11. Installation and Operation Precautions
The product is used on household appliances.
Please do not use it in the fields that require
high safety and dependency, such as medical
treatment, mining industry, disaster prevention,
etc.
The product adopts non-electrostatic
adsorption materials. Please avoid using it in
harsh and dusty environment. It is suggested to
close the air inlet after use.
When installing the product, make sure the air
inlet and outlet unblocked without large air
stream in. See the two figures below for
correct installation so that the accuracy is
ensured without dust covering on the surface
of sensitive elements for a long time.
Right Wrong Wrong
It is best to keep the air inlet and outlet close to
the blowhole of the internal surface of user's
appliance and communicating with the outside.
If not, keep the space around the air outlet
unobstructed in 2cm. A structure should be
formed to separate the air inlet from the air
outlet so that the airflow from the air outlet
cannot flow back to the air inlet.
The blowhole of user's appliance prepared for
the air inlet should not be smaller than the air
inlet itself. When applied to a purifier, the
product should not be placed directly in the air
channel of the purifier. If it has to do so, set an
independent structure to put the product in to
separate from the air channel of the purifier.
When applied to a fixed detection device, the
sensor should be placed 20cm above the
ground. Otherwise, it may cause the fan to be
blocked by surficial dust particles or even
floccules.
When applied to an outdoor fixed device, the
product should be protected from sand storm,
snow and rain or flocs. Do not damage,
dissemble the product, including its metal
shielding case.
Install the product in the place that cannot be
directly touched by human body, because the
metal part of the case connects with the DC
ground of its internal circuit board; if touched,
it will cause safety problems of the whole
product’s DC ground. It can only be touched
after power off.
To keep the data of the sensors consistent
after leaving factory, we don’t take the third
Laser Particle Sensor
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party detecting instrument or data correction
standard. If user insists, please try to fit the
data according to actual collected samples.
The sensor is for indoor use. If users’ device is
used in the following environment, additional
protection structure should be applied to the
sensor. Otherwise, its data compliance may
drops due to accumulation of dirt, oil, water,
etc.
1) Smoking room where the time with yearly dust
load above 400μg/m3 is longer than 60% of a year,
or the time with yearly dust load above 650g/m3 is
longer than 35% of a year.
2) Lampblack environment, e.g. kitchen.
3) High mist environment, e.g. SPA, shower room.
12. Contact us
Company: Jiangsu Jingchuang Electronics Co., Ltd
Address: No.1 Huangshan Rd., Tongshan Economic
Development Zone, Xuzhou, Jiangsu
Tel: 0516-68902829
URL: www.ustemtop.com
