Introduction
The temperature and humidity transmitter specifically measures gas humidity in high-temperature ducts. It serves boiler flue gas, heat‑treatment processes, and similar process‑control systems by providing continuous online humidity monitoring.
| Category | Parameter | Details |
|---|---|---|
| Humidity (Volume Ratio) | Measurement Range | 0–40 % V/V |
| Accuracy | ±1 % V/V (when <5 % V/V) ±20 % of reading (when >5 % V/V) |
|
| Response Time (to 63%) | 20 s (under dry conditions) | |
| Temperature | Measurement Range | −40 °C to 180 °C |
| Accuracy at 20 °C | ±0.2 °C | |
| Temperature Sensor | Pt100 RTD, Class F0.1 (EN 60751) | |
| Heated Sensor Behavior | Sensor heating near the dew point yields non‑actual temperature readings |
|
| Mechanical Specifications | Cable Gland (Waterproof) | M16 supports cable outer diameter up to 10 mm |
| Recommended Cable Diameter |
7–10 mm | |
| Transmitter Housing Material |
Aluminum alloy | |
| Probe Length Options | 260 mm standard; customizable to 500 / 800 / 1200 mm |
|
| Probe Diameter | 40 mm | |
| Protection Rating (Enclosure) |
IP66 | |
| Operating Conditions | Operating Temperature (Probe) |
Same as specified measurement range |
| Operating Temperature (Main Unit) |
−20 to 60 °C (LCD contrast may degrade at low temperatures) |
|
| Storage Temperature Range |
−40 to 70 °C | |
| Electromagnetic Compatibility (EMC) |
Suitable for industrial environments | |
| Power & Outputs | Power Supply | 220 VAC, 50 Hz ±10 % |
| Power Consumption | Max. 110 W | |
| Analog Outputs | 2 × 4–20 mA channels | |
| Analog Output Accuracy (at 20 °C) |
±0.05 % of full scale | |
| Output Temperature Coefficient |
±0.005 % FS per °C | |
| External Load & Wiring | Load Resistance | RL < 500 Ω |
| Max. Wiring Size | 1.5 mm² (recommend using 0.5 mm² (AWG20) stranded copper cable) |
The temperature/humidity transmitter typically consists of the following components:
Probe Filter
Humidity Sensor Probe
Duct‑Mounting Flange
Rainshield
Display Screen
Control Buttons
Transmitter Housing
Cable Gland locking nut
Features
The temperature and humidity transmitter employs a thin‑film capacitive humidity‑sensing element—also known as a resistance-capacitance or capacitive‑principle sensor. It uses a polymer thin film that physically adsorbs water vapor from flue gas, altering the film’s capacitance to output corresponding humidity parameters. This sensing method delivers precise accuracy, long-term stability, and minimal hysteresis. Moreover, the sensor’s surface incorporates a mesh-like coating that effectively shields the polymer from dust particles and most chemical contaminants..
Measuring carbon dioxide (CO2) is important for understanding the role it plays in the environment and its effect on climate change. CO2 is a major component of Earth’s atmosphere, and it traps heat like a blanket, causing global temperatures to rise. Too m uch CO2 can lead to drastic changes in our weather patterns and ecosystems, so monitoring its levels is essential for predicting future climate conditions. Additionally, measuring CO2 can help us better understand our impact on the environment and make informed decisions about how to reduce emissions and slow down down down down down global warming. By analyzing CO2 data over time, we can develop strategies to mitigate the effects of climate change and ensure a sustainable future.
Before industrialization, the global average annual atmospheric carbon dioxide concentration was 278ppm (1ppm is one part per million). In 2012, the global annual average atmospheric carbon dioxide concentration was 393.1ppm. By April 2014 , the monthly average carbon dioxide concentration in the northern hemisphere atmosphere exceeded 400ppm for the first time. . 2. Global climate warming, the continuous aggravation of the atmospheric greenhouse effect leads to global climate warming, resulting in a series of global climate problems that cannot be predicted by today’s science. According to the International Climate Change Economics Report, if human beings maintain the current way of life, by 2100, there will be a 50% chance that the global average temperature will rise by 4°C.
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