INTOIOT YD9731 Ultrasonic Liquid Level Transmitter

Product Overview

The YD9731 is an industrial-grade ultrasonic liquid level transmitter designed for measuring liquid levels up to 5 meters. It features a standard industrial interface for easy integration with PLCs, DCS, and other systems. The device utilizes a high-precision sensing core for reliable and stable performance. It offers various output options including RS232, RS485, CAN, 4-20mA, DC0-5V/10V, ZIGBEE, LORA, WIFI, GPRS, and NB-IOT.

Technical Specifications

Product Models

The YD9731 is available in several models based on the output mode:

Dimensions

The external dimensions of the YD9731 are as follows:

Height: 109mm

Diameter (main body): 89mm

Length (including probe): 172mm

Mounting thread: M33X1.5

Cable gland thread: M20X1.5

Note: Manual measurements, please refer to the actual product.

Typical Applications

The ultrasonic liquid level sensor is primarily used for water level monitoring in hydrological monitoring, urban pipe networks, and fire water tanks.

Image Description: A collage of images depicting various applications including agriculture (greenhouse), water management (water tower), and construction sites.

Package Contents

1 x Explosion-proof Ultrasonic Liquid Level Transmitter (Quantity may vary based on user selection)

RS485 Model: Communication Protocol

The YD9731 uses the RS485 MODBUS-RTU standard protocol. All operations and responses are in hexadecimal format. The default device address is 1, and the default baud rate is 9600, 8, n, 1 (for recording instruments, it's 115200, 8, n, 1).

1. Reading Data (Function Code 0x03)

Query Frame (Hexadecimal) Example: Querying data for device 1:

01 03 00 00 00 01 84 OA

Response Format: For a correct query, the device will respond with data like:

01 03 02 02 18 B9 2E

Data Description: The data is in hexadecimal. For example, 0218 converts to decimal 536. If the data multiplier is 100, the actual value is 5.36.

2. Common Data Address Table

3. Read and Modify Device Address

(1) Read or Query Device Address

If the current device address is unknown, and there is only one device on the bus, use the following command to query:

FA 03 00 66 00 01 71 9E

FA (250) is the general address. Use this address to retrieve the actual device address when unknown. 00 66 is the register for the device address.

Response Example:

01 03 02 00 01 79 84

The first byte (01) in the response indicates the actual address of the current device.

(2) Modify Device Address

To change the device address from 1 to 02, use the following command:

01 06 00 66 00 02 E8 14

Upon successful modification, the device will return:

02 06 00 66 00 02 E8 27

The first byte (02) indicates the new device address. The change takes effect immediately.

4. Read and Modify Baud Rate

(1) Read Baud Rate

The default baud rate is 9600. To change it, refer to the table and communication protocol. To read the current baud rate:

01 03 00 67 00 01 35 D5

Response Example:

01 03 02 00 03 F8 45

Baud Rate Codes: 1=2400, 2=4800, 3=9600, 4=19200, 5=38400, 6=115200.

(2) Modify Baud Rate

To change the baud rate from 9600 (code 3) to 38400 (code 5):

01 06 00 67 00 05 F8 16

The change takes effect immediately. The device may lose response temporarily.

5. Read and Modify Calibration Value (Some Products)

(1) Read Calibration Value

To adjust for measurement errors, you can modify the calibration value. The range is ±1000 (0-1000 or 64535-65535). To increase by 100:

01 03 00 6B 00 01 F5 D6 (Hexadecimal 0x64 for 100)

To decrease by 100 (e.g., -100), use 65435 (0xFF9C).

Response Example:

01 03 02 00 64 B9 AF

The first byte (01) is the device address. 00 6B is the register for the first parameter's calibration value.

(2) Modify Calibration Value

To increase the measured value by 1 (equivalent to adding 100 to the calibration value):

01 06 00 6B 00 64 F9 FD

The change takes effect immediately.

4-20mA Current Output: Current to Value Calculation

For a range of 0-5 meters and a 4-20mA output:

Calculation Formula: C = (5-0)*(X-4) / (20-4) + 0

Where:

• C = Calculated value
• 5 = Maximum range value
• 0 = Minimum range value
• X = Current measured value (mA)
• 20 = Maximum current output
• 4 = Minimum current output

Example: At 8mA, the measured value is 1.25.

DC0-10V Voltage Output: Voltage to Value Calculation

For a range of 0-5 meters and a 0-10V output:

Calculation Formula: C = (5-0)*(X-0) / (10-0) + 0

Where:

• C = Calculated value
• 5 = Maximum range value
• 0 = Minimum range value
• X = Voltage measured value (V)
• 10 = Maximum voltage output
• 0 = Minimum voltage output

Example: At 5V, the measured value is 2.5.

Disclaimer

This document provides information about the product. INTOIOT does not grant any intellectual property rights or licenses, whether express or implied. INTOIOT disclaims all warranties, including but not limited to warranties of merchantability, fitness for a particular purpose, and non-infringement of any patent, copyright, or other intellectual property rights. INTOIOT may modify product specifications and descriptions at any time without prior notice.

Contact Us

Brand: INTOIOT/Sonbest

Address: Room 8, No. 215 Nan Dong Road, Baoshan District, Shanghai, INTOIOT Brand Business Department

Chinese Website: http://www.intoiot.cn

International Website: http://www.intoiot.com

SKYPE: soobuu

Email: sale@sonbest.com

Phone: 86-021-51083595 / 66862055 / 66862075 / 66861077