Temtop PMS 11 Embedded Particle Counter for Particulate User Manual

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PMS 11

Embedded Particle Counter

Specifications

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Contents

1. Overview .......................................................................................................................................... 3

2. Working Principle ........................................................................................................................... 4

3. Technical Specifications ................................................................................................................ 5

4. Electrical Specifications ................................................................................................................ 6

5. Communication Protocol .............................................................................................................. 7

6. Item Dimension ............................................................................................................................ 15

7. Precautions for Installation and Operation ........................................................................... 15

8. Note and Warning ........................................................................................................................ 16

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1. Overview

PMS 11 series is an embedded and remote particle counter specially designed to provide solutions for the

online monitoring industry of atmospheric environment. It is widely used in filter testing, dust monitoring

and other air monitoring systems.

Name

Description

Note

1

VCC

Device power supply

(positive)

12V

2

GND

Device grounding

——

3

TX（A）

Communication sending pin

(RS485+) serial sending

4

RX（B）

Communication receiving

(RS485-) serial receiving

5

NC

——

Table 1 Definition of Hardware Interface

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2. Working Principle

This monitor relies on MIE scattering principle to monitor the concentration of particles. When the outside

air passes through the light collection chamber uniformly, the particles in the sampled gas will scatter

through the light beam. The photoelectric collection unit converts the scattered light signal into a voltage

pulse signal, which is converted into a digital signal after pre-amplification and AD conversion. The number

of voltage pulses measured is the number of particles, and the amplitude of voltage pulses reflects the size

of optical equivalent size of particle. The standard substance is used to calibrate the monitor after the

particle conversion, so as to determine the concentration of particles in the testing environment.

2.1 MIE scattering principle

A scattering occurred when the diameter of particles in the atmosphere is equal to the wavelength of

radiation is called the MIE scattering. The scattering intensity of MIE scattering is inversely proportional to

the second power of the wavelength. Unlike Rayleigh scattering enjoying a symmetrical distribution, MIE

scattering has stronger scattering in the forward direction than in the backward direction, with a more

obvious directivity.

2.2 Optical-mechanical structure and principle

Fig. 1 Analysis Chart of Light Refraction

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3. Technical Specifications

PMS 11

Unit

Note

Particle Size Range

0.3μm,0.5μm, 0.7μm,

1.0μm, 2.5μm, 5.0μm

P/L

Customize

Concentration Range

105,900

P/L

Repeatability

≤±30% of Relative Standard

Deviation

-

Resolution

1

P

-

Light Source

Laser Diode

-

Sampling Period

6

s

Communication

RS485

-

Flow Rate

1.1 (0.04)

L/min

(CFM)

Accuracy ±5%

Weight

350

g

-

Operation Environment

5℃~45℃, <90%RH

-

Storage Environment

-10℃~50℃, <90%RH

-

Size

113*88*38

mm

Excluding air inlet and

outlet

Table 2 Specifications of Particle Counter PMS 11

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4. Electrical Specifications

4.1 Electrical properties

Standard output (Temperature 25℃, Humidity 0-50% RH and 12V power supply voltage).

Parameters

Values

Unit

Rated voltage

DC 12

V

Standby current

30

mA

Average current

350

mA

Maximum current

400

mA

Starting current

700

mA

High-level input voltage

6

V

Low-level input voltage

-6

V

High-level output voltage

6

V

Low-level output voltage

-6

V

Table 3 Electrical Properties

4.2 Absolute limit values

The reliability of the device may be affected under the limit conditions for a long time.

Exceeding the following parameters range (Table 4) may cause permanent damage to the device.

Parameters

Range

Power supply voltage

11.5-12.5V

Voltage at I/O pin

-6-6 V

Working temperature range

-10-60 °C

Storage temperature range

-20-70 °C

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Working humidity range

0-95%RH (non-condensation)

Lightning surge

2KV

Static electricity

1KV for terminal test

8KV for test voltage of other

surfaces

Table 4 Absolute Limit Values

5. Communication Protocol

UART parameters:

-- Baud rate: 9600

-- Data bit: 8

-- Check bit: None

-- Stop bit: 1

Communication mode:

-- RS485 (Modbus RTU)

Address:

-- The default factory address of the monitor is 0x01 (or 0xFE, as Any Sensor).

Command mode:

-- The slave (monitor) is in the receiving state, only responding to the command of the host, not actively

sending the command. As the monitor needs 6 seconds to start, it will NOT response to any command

after the waiting time elapse.

Working mode:

-- Continuous measurement: The monitor works continuously.

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-- Intermittent mode: The sampling time/sampling interval can be set (The intermittent time can be set

by the users, and the monitor normally responds to the command of the host during the intermittent

mode)

-- The default factory setting of the monitor is intermittent mode, measuring for 60 seconds and stopping

for 60 seconds.

Checksμm:

-- CRC-16(Modbus), with high bytes before low bytes.

5.1 Format of host communication protocol

Restrictions:

1. Read-only register and read-write register are not allowed to overlap.

2. Bit addressing (coil and discrete input) cannot be realized.

3. Only achieved writing the single register function, writing multi-register is not supported.

4. The total number of registers is limited; it currently supports 32 input registers and 32 hold registers.

5. The current version does not support file transfer with large amount of data.

6. See table 1 and table 2 for register details. All registers are 16-bit words and register address is register

number -1.

Input Register, as shown in Table 5.

Data No.

Address

Definition

IR1

0

For later extended use

IR2

1

For later extended use

IR3

2

For later extended use

IR4

3

＞0.3μm, high bytes

IR5

4

＞0.3μm, low bytes

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IR6

5

＞0.5μm, high bytes

IR7

6

＞0.5μm, low bytes

IR8

7

＞0.7μm, high bytes

IR9

8

＞0.7μm, low bytes

IR10

9

＞1.0μm, high bytes

IR11

10

＞1.0μm, low bytes

IR12

11

＞2.5μm, high bytes

IR13

12

＞2.5μm, low bytes

IR14

13

＞5.0μm, high bytes

IR15

14

＞5.0μm, low bytes

IR16

15

For later extended use

IR17

16

For later extended use

IR18

17

For later extended use

IR19

18

For later extended use

IR20

19

For later extended use

IR21

20

For later extended use

IR22

21

For later extended use

IR23

22

For later extended use

IR24

23

For later extended use

IR25

24

For later extended use

IR26

25

For later extended use

IR27

26

For later extended use

IR28

27

For later extended use

IR29

28

For later extended use

IR30

29

For later extended use

Table 5 Input Register

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See Table 6 for the description of save register.

Data No.

Address

Definition

Meaning

IR1

0

For later extended use

IR2

1

Special command register

Command

Parameter

0x7C

0x06 Start Measurement

0x07 Stop Measurement

IR3

2

Address setting register

Slave Address (1-247)

IR4

3

Mode switching register

0x00 Continuous Working Mode

0x01 Intermittent Working Mode

IR5

4

Sample interval register

0xxx Sample interval setting (20~3600s)

IR6

5

Intermittent interval register

0xxx Intermittent interval setting (20~3600s)

IR7

6

0.3μm particle calibration

coefficient