Features

Adopting a highly sensitive gas detection probe
Stable signal and high accuracy
Wide measurement range and good linearity
Easy to use and install
Long transmission distance

Parameters

Supply voltage	10~30V DC
Output signal	485
Temp. range	-40℃ ~ +80℃	Humidity range	0~100%RH
Temp. accuracy	±0.5℃	Humidity accuracy	±3%RH
Operation temp.	-20~50℃	Operation humidity	15~90%RH No condensation
Pressure range	90~110Kpa
Stability	≤ 2% signal value per month
Response time	50、100ppm≤90S 500ppm≤25S
Consumption	0~50ppm (high accuracy) 0.12W
	0~100ppm (high accuracy) 0.12W
	0~500ppm 0.9W
Warm-up time	0-50ppm (high accuracy) ≥5 minutes
	0-100ppm (high accuracy)≥5 minutes
	0-500ppm ≥48 hours
Zero drift (-20~40℃)	0~50ppm (high accuracy) ≤±2ppm
	0~100ppm (high accuracy)≤±2ppm
	0~500ppm ≤±15ppm
Repeatability	0~50ppm (high accuracy) ≤2%
	0~100ppm (high accuracy) ≤2%
	0~500ppm ≤5%
Service life	≥12 months
Accuracy	0~50ppm (high accuracy) ±8%
	0~100ppm (high accuracy) ±8%
	0~500ppm: ±5%FS (@100ppm, 25℃,50%RH) O₂ content: ≥18%VOL
Resolution ratio	0-50ppm: 0.1ppm
	0-100、0-500ppm: 1ppm

Dimension

85*110*44 (mm)

Hardware connection

Packing list

Ammonia sensor (1 piece)

Self tapping screws (2 pieces), expansion plugs (2 pieces)

Product certificate and warranty card

Wiring connection

The input voltage is 10-30V. When wiring the 485 signal line, the A/B lines cannot be reversed, and the addresses of multiple devices on the bus cannot conflict.

	Color	Definition
Supply	Brown	Supply+
Supply	Black	Supply-
Communication	Yellow	485-A
Communication	Blue	485-B

Installation

Data conversion

Basic communication parameters

Code	8-bit binary	Error verification	CRC(Cyclic Redundancy Check)
Parity bit	None
Data bit	8-bit	BAUD	4800bit/s by default; 2400bit/s, 4800bit/s, 9600bit/s by customized
Stop bit	1-bit

Definition of data frame format

Host inquiry frame structure

Address

code

Function

code

Register start

address

Register

length

Check code

low order

Check code

high order

1 byte

1 byte

2 bytes

2 bytes

1 byte

1 byte

Slave ACK frame structure

Address

code

Function

code

Effective

bytes

Data

zone 1

Data

zone 2

Data

zone N

Check

code

1 byte

1 byte

1 byte

2 bytes

2 bytes

2 bytes

2 bytes

Register address

Single ammonia equipment (other registers are the same)

Register address

PLC or configuration address

Content

Operation

Range and definition description

0000 H

40001

Ammonia concentration value

R

50ppm, 10x value, uploaded;

100ppm or 500ppm, the actual value, uploaded

0002 H

40003

Ammonia temperature and humidity integrated equipment

Register address	PLC or configuration address	Content	Operation	Range and definition description
0000 H	40001	Humidity value	R	0~1000 （after 10 times larger）
0001 H	40002	Temperature value	R	-400~800 （after 10 times larger）
0002 H	40003	Ammonia concentration value	R	50ppm, 10x value, uploaded; 100ppm or 500ppm, the actual value, uploaded
0032 H	40051	Temperature calibration value	R&W	Write in 10x larger
0035 H	40054	Humidity calibration value	R&W	Write in 10x larger
0038 H	40057	Ammonia calibration value	R&W	50ppm, 10x value, uploaded; 100ppm or 500ppm, the actual value, uploaded
07D0 H	42001	Device address	R&W	1~255 (1 by default)
07D1 H	42002	Device baud rate	R&W	0:2400; 1: 4800; 2: 9600

Communication protocol examples and explanations

The address and baud rate of the device with reading address 0x01

Inquiry frame (e.g. address 0x01, baud rate 4800)

Address

code

Function

code

Register start

address

Register

length

Check code

low order

Check code

high order

0x01

0x03

0x07 0xD0

0x00 0x02

0xC4

0x86

ACK frame

Address

code

Function

code

Effective

bytes

BAUD

rate

Address

Check code

low order

Check code

high order

0x01

0x03

0x04

0x00 0x01

0x00 0x01

0x6A

0x33

Address modification

Inquiry frame (e.g. address 0x02; Note: After modifying the address, the device needs to be powered off and restarted)

Address

code

Function

code

Register start

address

Modify

values

Check code

low order

Check code

high order

0x01

0x06

0x07 0xD0

0x00 0x02

0x08

0x86

ACK frame

Address

code

Function

code

Register start

address

Modify

values

Check code

low order

Check code

high order

0x01

0x06

0x07 0xD0

0x00 0x02

0x08

0x86

The baud rate of address modification 0x01

Inquiry frame (e.g. baud rate is changed to 9600; Note: After modifying the address, the device needs to be powered off and restarted)

Address

code

Function

code

Register start

address

Modify

values

Check code

low order

Check code

high order

0x01

0x06

0x07 0xD1

0x00 0x02

0x59

0x46

ACK frame

Address

code

Function

code

Register start

address

Modify

values

Check code

low order

Check code

high order

0x01

0x06

0x07 0xD1

0x00 0x02

0x59

0x46

NH₃ value of Read device address 0x01

Inquiry frame (A single ammonia device can read either register 00 or register 02, while a three-in-one device can only read register 02)

Address

code

Function

code

Register start

address

Register

length

Check code

low order

Check code

high order

0x01

0x03

0x00 0x02

0x00 0x01

0x25

0xCA

ACK frame

Address

code

Function

code

Returns the number of valid bytes

NH₃ value

Check code

low order

Check code

high order

0x01

0x03

0x02

0x00 0x64

0x9B

0xAF

NH₃：

0064(hexadecimal) =100=> NH₃=100ppm

The temperature, humidity, and ammonia values of read device address 0x01

Inquiry frame

Address

code

Function

code

Register start

address

Register

length

Check code

low order

Check code

high order

0x01

0x03

0x00 0x00

0x00 0x03

0x05

0xCB

ACK frame

Address

code

Function

code

Bytes

Humidity

value

Temp.

value

NH₃

value

Check code

low order

Check code

high order

0x01

0x03

0x06

0x01 0x67

0xFF 0xB5

0x00 0x64

0xD7

0x5E

Temperature:

When the temperature is below 0℃, it is uploaded in the form of a complement.

FFB5 H (hexadecimal)=-75=>Temperature = -7.5℃

Humidity:

167 H (hexadecimal)=359=>Humidity=35.9% RH

Ammonia:

When the range is 50ppm

0064 (hexadecimal)=100=>Ammonia=10 ppm

When the range is 100ppm or 500ppm

0064 (hexadecimal)=100=>Ammonia=100 ppm

Equation between ppm and mg/m3 (@25℃, 1 bar)

X ppm = (Y mg/m³)(24.45)/(molecular weight) or Y mg/m³ = (X ppm)(molecular weight)/24.45

For NH₃ calculation only：1ppm=0.70mg/m³ 1mg/m³=1.44ppm

Notes

1) Do not apply this device to systems involving personal safety.

2) Do not install the device in a strong convective air environment for use.

3) Equipment should avoid contact with organic solvents (including silicone and other adhesives), coatings, chemicals, oils, and high concentration gases.

4) Equipment cannot be used in environments containing corrosive gases for a long time, as corrosive gases can damage sensors.

5) Do not place the device in high concentration organic gases for a long time, as long-term exposure may cause the zero point of the sensor to drift and slow recovery.

6) Prohibit long-term storage and use in high concentration alkaline gases.

7) Although this product has high reliability, we recommend checking the equipment's response to the target gas before use to ensure on-site use.

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