Application of Kunlun Zhongda High Temperature and Humidity Transmitter in Wood Drying Kilns

The wood drying kiln is the core equipment in wood processing, and the drying quality directly determines the cracking rate, deformation rate and commercial value of the finished products. Traditional ordinary temperature and humidity sensors are prone to data drift, probe condensation and even burnout failure in such wide temperature and high humidity environments.

The Kunlun Zhongda for some high temperature models, it can reach 200℃, and it can continuously and stably output high precision temperature and humidity data throughout the entire process of the drying kiln, which is the core sensing hardware for achieving precise drying control.

What are The Core Requirements for High Temperature and Humidity Transmitters in Wood Drying Kilns

Wood drying process consists of four process stages, each with significantly different temperature and humidity conditions, placing extremely high demands on wide temperature adaptability and anti-condensation performance of sensors.

In the preheating stage process, the temperature is around 40°C to 50°C, humidity around 90% to 95% RH. High temperature and high humidity are near the saturation that make the ordinary sensors is extremely easy to condensation and failure. The high temperature and humidity transmitter is required to monitor it.

In the initial drying process, the temperature is around 55°C to 70°C, humidity around 70% to 80% RH. Once temperature rise rapidly, it requires fast sensor response by using high temperature and humidity transmitter.

In the intermediate drying process, the temperature is around 65°C to 80°C, humidity around 50% to 60% RH. The high temperature and humidity transmitter is required for long-term stable operation in the high temperature with moderate humidity environment.

In the final drying process, the temperature is around 60°C–75°C, humidity around 30% to 40% RH. While both temperature and humidity decrease, it requires high temperature and humidity transmitter to cover wide measurement range.

What are The Typical Application Scenarios of High Temperature and Humidity Transmitter

1.Distributed Deployment for Micro Environment Monitoring of Full Kiln

Multiple high temperature and humidity transmitter nodes are evenly deployed across the upper, middle, and lower layers of the drying kiln, as well as at key positions such as air inlets and outlets. It constructs a millisecond level synchronized sensor network which have comprehensive sense on temperature gradients and humidity stratification inside the kiln to eliminate monitoring blind spots.

2.Real Time Closed Loop Control to Match Precisely Drying Base Curves

The high temperature and humidity transmitter transmit real time temperature and humidity data to the PLC control system via 4–20mA/RS485 signals. According to preset drying base curves which classified by wood species and thickness, the system will dynamically adjust heating valves, spray valves, exhaust valves, and fan speeds.

When the actual temperature is below the setpoint, it will automatically increase heating power; when the actual humidity is above the setpoint, it will automatically open exhaust valves; when the humidity is too low, it will activate spray humidification to prevent surface cracking due to over drying.

Summary

The Kunlun Zhongda high temperature and humidity transmitters are the key hardware foundation for transitioning wood drying kilns from experience-based drying to precision drying. The high temperature adaptability, anti-condensation design, and industrial grade stability directly determine the intelligence level of the drying process and the quality of the final product.