A temperature and humidity transmitter is a critical component in humidity test chambers, responsible for accurately monitoring and transmitting real-time environmental data. It helps maintain the desired climate conditions by feeding precise temperature and humidity readings to the chamber’s control system. This ensures consistency, repeatability, and compliance with testing standards, especially in industries like pharmaceuticals, electronics, and materials testing.

For high-reliability applications such as pharmaceutical stability testing or electronic component reliability, humidity transmitters should offer an accuracy of ±1.0%RH or better, with premium models achieving ±0.8%RH. Temperature accuracy should typically be within ±0.1°C to ±0.2°C. The sensor must also demonstrate low drift over time (≤1.0%RH/year) and fast response times (≤10 seconds) to meet strict control requirements.

Common failure risks include:

• Condensation buildup on the sensor element, causing reading errors or corrosion.

• Microbial growth due to prolonged exposure to high moisture.

• Signal drift or loss of calibration over time.

• Ingress of water vapor damaging internal electronics.
  To mitigate these risks, industrial-grade transmitters are designed with anti-condensation coatings, sealed housings, sensor heaters및 corrosion-resistant materials (e.g., 316L stainless steel or PBT enclosures).

No, standard HVAC humidity transmitters are typically not suitable for the rigorous and high-humidity operating conditions of climate or test chambers. They often lack the necessary:

• Measurement accuracy

• Environmental sealing

• Condensation protection

• 장기적인 안정성
  Industrial or laboratory-grade transmitters are specifically designed to operate in 90–95%RH, with strong resistance to drift, corrosion, and electrical interference, making them essential for reliable test chamber operation.

The most commonly used output signals include:

• Analog outputs: 4–20mA or 0–10V, suitable for direct connection with PLCs or analog controllers.

• Digital outputs: RS485 with Modbus RTU protocol, allowing for long-distance, multi-point data collection and integration with modern data logging systems.
  A dual-output model (e.g., analog + Modbus) is often preferred for flexible integration and redundancy.

Calibration frequency depends on the application, sensor stability, and regulatory requirements. In general:

• High-precision applications (e.g., pharmaceutical stability chambers): calibrate every 6–12 months.

• 일반 산업용: annual calibration may suffice if the sensor is stable.
  Choose transmitters with low drift specifications, multi-point calibration support및 field calibration options to minimize downtime and ensure traceability.