How Do Humidity and Temperature Transmitters Work?
In short, Humidity and temperature transmitters measure and send environmental data to control systems. They are widely used in HVAC, pharmaceuticals, food processing, and cleanrooms
Item Number: HG803-6C8P-01
HG803 adopts standard industrial interface RS485 digital signal output, and can be connected to
on-site digital display meters, PLCs, frequency converters,
industrial control hosts and other equipment .
Safe and reliable, with a beautiful appearance and
convenient installation.
Modbus RS485 Dewpoint
1.Integrated probe structure design, lightweight and convenient.
2.Easy to Install and r educe equipment maintenance costs
3.High cost-effectiveness, reliable and affordable
4.Suitable for sensor vulnerable temperature and humidity
measurement scenarios, such as smart farming, smart
agriculture, etc
* Temperature Range: -20~60°℃(Plastic conjoined probe)
* Temperature Accuracy:土0.3°℃(25°C) ,(Higher precision is customizable)
* Humidity Range: 0~100% RH
* Humidity Accuracy:土3%RH(60%RH,25°C)(Higher precision is customizable)Long-term Temperature Stability: ≤0.1°C/y
* Long-term Humidity Stability: ≤1%RH/y
* Signal Output : ①The RS485 signal output or@4-20 mA temperature and humidity two analog capacity + RS485 signal output
* Baud rate: 1200、2400、4800、9600、19200、115200can set, Default is 9,600 pbs
* Transmitter circuit operating temperature: -20°C~+60℃,0%RH~95%RH,Non-knot dew Supports both single-register and multiple-register reads
* Industrial grade ESD safety protection and power supply reverse protection design
| Technical Data | Description |
|---|---|
| DC power supply | 10 ~ 30V DC (12V recommended) |
| Maximum power consumption | About 1.2W |
| Current output | About 1.2W |
| Voltage output | About 1.2W |
| Typical accuracy (Temperature) | ±0.3℃ (25℃) / ±0.54℉ (77℉) |
| Typical accuracy (Humidity) | ±3%RH (60%RH, 25℃) |
| Measuring medium | Air |
| Measuring range (Temperature) | -40℃ ~ 80℃ / -40℉ ~ 176℉ (default) |
| Measuring range (Humidity) | 0%RH – 100%RH |
| Long-term stability (Temperature) | ≤ 0.1℃ /y |
| Long-term stability (Humidity) | ≤ 1%RH /y |
| Response time (Humidity) | ≤ 8s (1m/s Wind speed) |
| Response time (Temperature) | ≤ 15s (1m/s Wind speed) |
| Analog output | Signal Current 4 – 20 mA |
| Digital output | RS485 Communication (Modbus) protocol |
| Data bit length | 8 bits |
| Parity check mode | None |
| Stop bit length | 1 bit |
| Default Modbus communication address | 1 |
| Function code | 03 |
| Baud rate | 1200, 2400, 4800, 9600, 19200, 115200 (optional, default 9600 bps) |
| Load capacity (Current output) | ≤ 600Ω |
| Load capacity (Voltage output) | ≤ 250Ω |
| Transmitter circuit operating temperature | -20℃ ~ +60℃, 0%RH ~ 95%RH (non-condensation) |
| Line Color | Definition | Specification |
|---|---|---|
| Power Cord | ||
| Red | Power supply positive | 10 ~ 30V DC |
| Black | Power supply negative | GND |
| Analog Output Lines | ||
| Brown | Temperature signal positive | 4-20mA output |
| Blue | Temperature signal negative | Connects to Black (GND) |
| Grey | Humidity signal positive | 4-20mA output |
| White | Humidity signal negative | Connects to Black (GND) |
| RS485 Wiring | ||
| Yellow | RS485A | Twisted pair cable |
| Green | RS485B | Twisted pair cable |
Additional Notes:
Important:
These transmitters can be used for indoor air temperature and humidity monitoring in various industrial plant, clean room, lab, machine room, commercial buildings, airport, and schools.
The modbus interface is documented and integrator friendly. They also have transducer outputs for connecting as analog inputs to all popular control systems.
Various models are available:
Duct Mount,
Wall Mount,Room Mount and 2 meter cable.BACnet MS/TP and
Modbus RTU protocols over RS485,with an ethernet port.
In short, Humidity and temperature transmitters measure and send environmental data to control systems. They are widely used in HVAC, pharmaceuticals, food processing, and cleanrooms
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