UBIBOT UB-DWT-N1 Dry and Wet Bulb Temperature Sensor User Guide
- June 14, 2024
- UBIBOT
Table of Contents
UBIBOT UB-DWT-N1 Dry and Wet Bulb Temperature Sensor
Specifications:
- Product Model: UB-DWT-N1
- Power Supply: DC 5-12V
- Measurement Data:
- Dry Bulb Temperature
- Wet Bulb Temperature
- Atmospheric Humidity
- Atmospheric Pressure
- Dew Point Temperature
- Working Environment: -40~60°C, 0~80%RH
- Response Time: 1s
- Communication Protocol: RS485 Modbus RTU Protocol
- Baud Rate: 1200 bit/s, 2400 bit/s, 4800 bit/s, 9600 bit/s (default), 19200 bit/s
Product Usage Instructions
Installation:
- Mount the sensor in the desired location using the provided mounting bracket.
- Ensure the sensor is securely installed to prevent any movement during operation.
Data Retrieval:
To retrieve data from the sensor, follow the Modbus-RTU communication
protocol as described below:
Communication Basic Parameters:
- Coding System: 1-bit CRC Check
- Baud Rate: 1200 bit/s, 2400 bit/s, 4800 bit/s, 9600 bit/s (default), 19200 bit/s
Data Frame Format:
The Modbus-RTU communication protocol format includes:
- Address code: Default 0xC3
- Function code: Support function codes 0x03 (read-only) and 0x06 (read/write)
- Data area: N bytes of 16-bit data with high byte first
- Error check: 16-bit CRC code
Register Address Definitions:
| Address (hex) | Description | Data Length |
|---|---|---|
| 0x0000 | Wet Bulb Temperature (1 byte) | |
| 0x0001 | Dew Point Temperature (1 byte) | |
| 0x0002 | Dry Bulb Temperature (1 byte) | |
| 0x0003 | Air Pressure (1 byte) | |
| 0x0004 – 0x0006 | Relative Humidity, Absolute Humidity, Vapor Pressure (1 byte | |
| each) | ||
| 0x0007 | Saturation (1 byte) | |
| 0x0008 | Specific Volume (1 byte) | |
| 0x0009 – 0x0064 | Specific Enthalpy, Slave Address (1 byte each) |
Frequently Asked Questions (FAQ):
-
Q: What is the working voltage range for this sensor?
A: The sensor works with a DC power supply ranging from 5-12V. -
Q: What communication protocol does the sensor support?
A: The sensor supports the Modbus-RTU protocol over RS485 communication. -
Q: How can I calculate the wet bulb temperature using this sensor?
A: The sensor provides the necessary data to calculate the wet bulb temperature based on the measured dry bulb temperature, humidity, and atmospheric pressure values.
Introduction
Dry and wet bulb temperature sensor adopts original imported sensor. It has
stable measurement data, high precision, strong anti-interference ability and
long service life.
It can accurately measure the dry bulb temperature, humidity and atmospheric
pressure value, and also can calculate the wet bulb temperature, dew point
temperature, relative humidity and other data.
Applications
It is suitable for environmental monitoring, agrometeorology and other monitoring environments.
Features
- Multi-parameter in one, including dry bulb temperature, wet bulb temperature, humidity, atmospheric pressure and more.
- With mounting bracket, easy to install and use.
- Supporting Modbus-RTU protocol
- DC 5-12V wide voltage supply
Specifications
Specification
Product Model| UB-DWT- N1
Power Supply| DC 5-12V
Measurement Data
| Dry Bulb Temperature| Range: -40~80℃, Accuracy: ±0.2℃ (@0~65℃)
Wet Bulb Temperature| Range: -40~80℃, Accuracy: ±0.3℃
Atmospheric Humidity| Range: 0-100%, Accuracy: ±2%RH (@10~90%RH)
Atmospheric Pressure| Range: 26~126kPa, Accuracy: ±50Pa
Dew Point Temperature| Range: -90℃~80℃, Accuracy: ±0.3℃
Working Environment| -40~60℃，0%~80%RH
Response Time| ≤1s
Communication Protocol| RS485 Modbus RTU Protocol
RS485 Address| 0xC3
Baud Rate| 1200 bit/s,2400 bit/s, 4800 bit/s, 9600 bit/s(default),
19200
bit/s
Communication protocols
Communication Basic Parameter
Coding System| 8–bit binary
Data Bit| 8 bits
Parity Checking Bit| none
Error Checking| CRC Check
---|---
Baud Rate| 1200 bit/s,2400 bit/s, 4800 bit/s, 9600 bit/s(default), 19200 bit/s
Communication basic parameters
Data Frame Format
The Modbus-RTU communication protocol is used in the following format:
- Initial structure ≥ 4 bytes in time.
- Address code: 1 byte, default 0xC3.
- Function code: 1 byte, support function code 0x03 (read-only) and 0x06 (read/write).
- Data area: N bytes, 16-bit data, high byte comes first.
- Error check: 16-bit CRC code.
- End structure ≥ 4 bytes of time
Request
Slave Address| Function Code| Register Address| No. of Registers| CRC LSB| CRC
MSB
1 byte| 1 byte| 2 bytes| 2 bytes| 1 byte| 1 byte
Response
Slave Address| Function Code| No. of Bytes| Content 1| Content 1| …| Content
n| CRC
1 byte| 1 byte| 1 byte| 2 bytes| 2 bytes| …| 2 bytes| 2 bytes
Register Address
Register Address
Address
(hex)
| Content| Data
Length
| Function
Code
| Description of definitions
0x0000| Wet Bulb
Temperature
| 1 byte| 03| Signed 16-bit integer data, divided by 10 with one decimal place,
in [℃]
0x0001| Dew Point
Temperature
| 1 byte| 03| Signed 16-bit integer data, divided by 10 with one decimal place,
in [℃]
0x0002| Dry Bulb
Temperature
| 1 byte| 03| Signed 16-bit integer data, divided by 10 with one decimal place,
in [℃]
0x0003| Air Pressure| 1 byte| 03| Unsigned 16-bit integer data, divided by 100 with two decimal
places, in [kPa]
0x0004| Relative
Humidity
| 1 byte| 03| Unsigned 16-bit integer data, divided by 10 with one decimal
place, in [0~100%]
0x0005| Absolute
Humidity
| 1 byte| 03| Unsigned 16-bit integer data, divided by 100 with two decimal
places, in [gwater/kgAIR]
0x0006| Vapor Pressure| 1 byte| 03| Unsigned 16-bit integer data, actual
value, in [kPa]
0x0007| Saturation| 1 byte| 03| Unsigned 16-bit integer data, divided by 100
with two decimal
places, in [-]
0x0008| Specific Volume| 1 byte| 03| Unsigned 16-bit integer data, divided by 1000 with three
decimal places, in [m3/kg]
0x0009| Specific
Enthalpy
| 4 bytes| 03| IEEE75 standard 32-bit floating point number, in [J/kg]
0x0064| Slave Address| 1 byte| 06| 1～255，default 195（0xC3）