Why Generic Sensors Fail in the Cold Chain
Introduction When it comes to cold chain logistics, product safety hinges on more than just temperature. As storage environments grow more complex and goods more
Item Number: HG803-3W4P-08
*The HG803 Air Duct Series Transmitter is equipped with a sensitive waterproof and anti fine dust high-temperature probe, with a temperature range of -40~80 ℃.
*Adopting standard industrial interface RS485 digital signal out put or 4-20 mA analog output, with display function, it can be connected to on-site digital display meters, PLCs, frequency converters, industrial control hosts an d other equipment.
Modbus RS485 + 4-20mA Both Output
▪Integrated design, simple and elegant
▪Industrial grade ESD safety protection and power supply anti reverse connection design
▪Using waterproof, dustproof, and high-temperature resistant probes
▪Sensitive waterproof and anti fine dust high-temperature probe
▪Standard RS485 Modbus RTU communication protocol
▪High precision, high stability, LP66 waterproof and Dustproof level
▪Multiple probe materials available
* Temperature Range: -40~80°℃(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
* Sensitive waterproof and fine dust high temperature resistant probe
*Digital output can set the output of 0.1 or 0.01 resolution
*Analog output with a resolution of 15 bits
| 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.
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HENGKO is a prominent supplier of temperature and humidity monitoring solutions for various industries, specializing in manufacturing advanced temperature and humidity transmitters and sensors.
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